GEARBOX WITH MULTIPLE PLANETARY GEAR SETS HAVING SAME TYPE OF CENTER GEAR

Abstract

A gearbox with multiple planetary gear sets having the same type of center gears includes a planetary gear set, a planetary gear set structure, an input end, an output end and a locking end, and brakes (8). The gearbox adopts at least three planetary gear sets having the same type of center gears (sun gears) or three planetary gear sets having the same type of center gears (ring gears) to form a star-connected planetary gear set structure. A planet carrier (7) is used as the input end, any of the center gears (1) is used as the output end, and the remaining center gears (2, 3) are each used as a locking end. The gearbox adopts at least two brakes (8), each of the brakes (8) connected to a locking end. The brakes (8) are controlled by a gear shift control device to be in any of a braking state, a half-braking state and a non-braking state. The gearbox controls the gear by controlling the braking of the brakes (8).

Claims

1. A gearbox with multiple planetary gear sets having the same type of center gears, comprising a planetary gear set, a planetary gear set structure, an input end, an output end and a locking end, and brakes, wherein at least three planetary gear sets having the same type of center gears are adopted, and each planetary gear set is an incomplete single-layer star planetary gear set and is provided with a center gear and a planet carrier with a planetary gear; all the center gears in the planetary gear sets are either sun gears or ring gears, and all the center gears in the gearbox are the same type of center gears; the planetary gear sets having the same type of center gears comprise a planetary gear set having the same type of center gears (sun gears) and a planetary gear set having the same type of center gears (ring gears), a planetary gear set having the same type of center gears all of which are sun gears is referred to as a planetary gear set having same type of center gears (sun gears), and a planetary gear having the same type of center gears all of which are ring gears is referred to as a planetary gear set having the same type of center gears (ring gears); a planetary gear set having the same type of center gears (sun gears) is selected to form a gearbox with a planetary gear set having the same type of center gears (sun gears), and a planetary gear set having the same type of center gears (ring gears) is selected to form a gearbox with a planetary gear set having the same type of center gears (ring gears); the planetary gear set structure is a star-connected planetary gear set structure, in which for multiple single-layer star planetary gear sets, the number of planetary gear groups is set to be the same, the size of the planetary gear sets is adjusted until a distance between a planetary gear axis in each planetary gear set and a central axis of the planetary gear set is equal, each planetary gear in a planetary gear set is aligned with a planetary gear axis of an adjacent planetary gear set and they are connected in group, such a connection is referred to as a star connection, and such a planetary gear set structure is referred to as a star-connected planetary gear set structure; the input end, the output end and the locking end are as follows: the planet carrier is used as the input end to connect to a power device, any of the center gears is used as the output end to connect to a powered device, and the remaining center gears are each used as a locking end to connect to a brake, and the brake is controlled by a gear shift control device; and the brakes are as follows: at least two brakes are used as a controller of the gearbox, each connected to a locking end, and the brakes are controlled to be in any of a braking state, a half-braking state and a non-braking state.

2. The gearbox with multiple planetary gear sets having the same type of center gears according to claim 1, wherein a brake is controlled to brake such that the speed of the center gear connected thereto is zero; when the input end inputs a rotation speed, a brake is controlled to brake, the output end forms an output rotation speed which has a definite proportional relationship with the input rotation speed, and the gearbox forms a transmission ratio corresponding to a gear; when another brake is controlled to brake, the output end forms another output rotation speed which has another definite proportional relationship with the input rotation speed, and the gearbox forms another transmission ratio corresponding to another gear; and so on, the gearbox controls the gear by controlling the braking of the brakes; when a brake is controlled to brake half, the gearbox is in a half-linkage state in the corresponding gear; when the brakes are controlled to not brake, the gearbox is in neutral; and when two or more brakes are controlled to brake, the gearbox stops operating.

3. The gearbox with multiple planetary gear sets having the same type of center gears according to claim 1, wherein a reverse gearbox of the gearbox adopts the same planetary gear set, the same planetary gear set structure, the same brakes, but the input end, the output end and the locking end are changed as follows: the planet carrier is used as the output end to connect to a powered device, any of the center gears as the input end to connect to a power device, and the remaining center gears each as a locking end to connect to a brake; its operating characteristics remain unchanged; and the reverse gearbox of the gearbox also falls within the scope of protection of the present invention; the planetary gear set is used as a gearbox and is not connected with any power and braking equipment, which is already explained.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 is a schematic diagram of a gearbox with three planetary gear sets having the same type of center gears (ring gears) according to the present invention. 1 represents a ring gear of a first planetary gear set, 2 represents a ring gear of a second planetary gear set, 3 represents a ring gear of a third planetary gear set, 4 represents a planetary gear of the first planetary gear set, 5 represents a planetary gear of the second planetary gear set, 6 represents a planetary gear of the third planetary gear set, 7 represents a planet carrier, 8 represents a brake (2 brakes are provided), 9 represents an input arrow, and 10 represents an output arrow.

[0019] FIG. 2 is a schematic diagram of a gearbox with three planetary gear sets having the same type of center gears (ring gears) according to the present invention. 1 represents a ring gear of a first planetary gear set, 2 represents a ring gear of a second planetary gear set, 3 represents a ring gear of a third planetary gear set, 4 represents a planetary gear of the first planetary gear set, 5 represents a planetary gear of the second planetary gear set, 6 represents a planetary gear of the third planetary gear set, 7 represents a planet carrier, 8 represents a brake (2 brakes are provided), 9 represents an input arrow, and 10 represents an output arrow.

[0020] FIG. 3 is a schematic diagram of a gearbox with four planetary gear sets having the same type of center gears (ring gears) according to the present invention. 1 represents a ring gear of a first planetary gear set, 2 represents a ring gear of a second planetary gear set, 3 represents a ring gear of a third planetary gear set, 4 represents a ring gear of a fourth planetary gear set, 5 represents a planetary gear of the first planetary gear set, 6 represents a planetary gear of the second planetary gear set, 7 represents a planetary gear of the third planetary gear set, 8 represents a planetary gear of the fourth planetary gear set, 9 represents a planet carrier, 10 represents a brake (3 brakes are provided), 11 represents an input arrow, and 12 represents an output arrow.

[0021] FIG. 4 is a schematic diagram of a gearbox with five planetary gear sets having the same type of center gears (ring gears) according to the present invention. 1 represents a ring gear of a first planetary gear set, 2 represents a ring gear of a second planetary gear set, 3 represents a ring gear of a third planetary gear set, 4 represents a ring gear of a fourth planetary gear set, 5 represents a ring gear of a fifth planetary gear set, 6 represents a planetary gear of the first planetary gear set, 7 represents a planetary gear of the second planetary gear set, 8 represents a planetary gear of the third planetary gear set, 9 represents a planetary gear of the fourth planetary gear set, 10 represents a planetary gear of the fifth planetary gear set, 11 represents a planet carrier, 12 represents a brake (4 brakes are provided), 13 represents an input arrow, and 14 represents an output arrow.

[0022] FIG. 5 is a schematic diagram of a gearbox with six planetary gear sets having the same type of center gears (ring gears) according to the present invention. 1 represents a ring gear of a first planetary gear set, 2 represents a ring gear of a second planetary gear set, 3 represents a ring gear of a third planetary gear set, 4 represents a ring gear of a fourth planetary gear set, 5 represents a ring gear of a fifth planetary gear set, 6 represents a ring gear of a sixth planetary gear set, 7 represents a planetary gear of the first planetary gear set, 8 represents a planetary gear of the second planetary gear set, 9 represents a planetary gear of the third planetary gear set, 10 represents a planetary gear of the fourth planetary gear set, and 11 represents a planetary gear of the fifth planetary gear set, 12 represents a planetary gear of the sixth planetary gear set, 13 represents a planet carrier, 14 represents a brake (5 brakes are provided), 15 represents an input arrow, and 16 represents an output arrow.

[0023] FIG. 6 is a schematic diagram of a gearbox with three planetary gear sets having the same type of center gears (sun gears) according to the present invention. 1 represents a sun gear of a first planetary gear set, 2 represents a sun gear of a second planetary gear set, 3 represents a sun gear of a third planetary gear set, 4 represents a planetary gear of the first planetary gear set, 5 represents a planetary gear of the second planetary gear set, and 6 represents a planetary gear of the third planetary gear set, 7 represents a planet carrier, 8 represents a brake (2 brakes are provided), 9 represents an input arrow, and 10 represents an output arrow.

[0024] FIG. 7 is a schematic diagram of a gearbox with three planetary gear sets having the same type of center gears (sun gears) according to the present invention. 1 represents a sun gear of a first planetary gear set, 2 represents a sun gear of a second planetary gear set, 3 represents a sun gear of a third planetary gear set, 4 represents a planetary gear of the first planetary gear set, 5 represents a planetary gear of the second planetary gear set, and 6 represents a planetary gear of the third planetary gear set, 7 represents a planet carrier, 8 represents a brake (2 brakes are provided), 9 represents an input arrow, and 10 represents an output arrow.

[0025] FIG. 8 is a schematic diagram of a gearbox with four planetary gear sets having the same type of center gears (sun gears) according to the present invention. 1 represents a sun gear of a first planetary gear set, 2 represents a sun gear of a second planetary gear set, 3 represents a sun gear of a third planetary gear set, 4 represents a sun gear of a fourth planetary gear set, 5 represents a planetary gear of the first planetary gear set, 6 represents a planetary gear of the second planetary gear set, 7 represents a planetary gear of the third planetary gear set, 8 represents a planetary gear of the fourth planetary gear set, 9 represents a planet carrier, 10 represents a brake (3 brakes are provided), 11 represents an input arrow, and 12 represents an output arrow.

[0026] FIG. 9 is a schematic diagram of a gearbox with five planetary gear sets having the same type of center gears (sun gears) according to the present invention. 1 represents a sun gear of a first planetary gear set, 2 represents a sun gear of a second planetary gear set, 3 represents a sun gear of a third planetary gear set, 4 represents a sun gear of a fourth planetary gear set, 5 represents a sun gear of a fifth planetary gear set, 6 represents a planetary gear of the first planetary gear set, 7 represents a planetary gear of the second planetary gear set, 8 represents a planetary gear of the third planetary gear set, 9 represents a planetary gear of the fourth planetary gear set, 10 represents a planetary gear of the fifth planetary gear set, 11 represents a planet carrier, and 12 represents a brake (4 brakes are provided), 13 represents an input arrow, and 14 represents an output arrow.

[0027] FIG. 10 is a schematic diagram of a gearbox with six planetary gear sets having the same type of center gears (sun gears) according to the present invention. 1 represents a sun gear of a first planetary gear set, 2 represents a sun gear of a second planetary gear set, 3 represents a sun gear of a third planetary gear set, 4 represents a sun gear of a fourth planetary gear set, 5 represents a sun gear of a fifth planetary gear set, 6 represents a sun gear of a sixth planetary gear set, 7 represents a planetary gear of the first planetary gear set, 8 represents a planetary gear of the second planetary gear set, 9 represents a planetary gear of the third planetary gear set, 10 represents a planetary gear of the fourth planetary gear set, 11 represents a planetary gear of the fifth planetary gear set, and 12 represents a planetary gear of the sixth planetary gear set, 13 represents a planet carrier, 14 represents a brake (5 brakes are provided), 15 represents an input arrow, and 16 represents an output arrow.

[0028] In each figure, the planetary gear set is shown as a half-schematic diagram according to the industry practice, the input and output are shown as arrows, and the brake is shown with the stator grounded. The components in each figure only show the structural relationship, and do not reflect the actual size.

DETAILED DESCRIPTION

[0029] Embodiment 1: An example of a gearbox according to the present invention with three planetary gear sets having the same type of center gears (ring gears). The gearbox includes a planetary gear set, a planetary gear set structure, an input end, an output end and a locking end, and brakes, among others.

[0030] The planetary gear set is as follows: this embodiment adopts three planetary gear sets having the same type of center gears (ring gears). Each planetary gear set is provided with a center gear and a planet carrier with a planetary gear. The center gears in the planetary gear sets are all ring gears, which are the same type of center gears. The number of planetary gear groups in the three planetary gear sets is 4. The planetary gear is a shaft, and the planet carrier is a bearing. Note: If the planetary gear is changed to be a bearing and the planet carrier to a shaft, reference may be made to FIG. 2.

[0031] The planetary gear set structure is a star-connected planetary gear set structure. Suppose Zq1 represents the number of teeth of the ring gear in a first planetary gear set, Zq2 represents the number of teeth of the ring gear in a second planetary gear set, Zq3 represents the number of teeth of the ring gear in a third planetary gear set, X1 represents the number of teeth of the planetary gear in the first planetary gear set, X2 represents the number of teeth of the planetary gear in the second planetary gear set, and X3 represents the number of teeth of the planetary gear in the third planetary gear set. In this embodiment, the number of gear teeth of the components is determined as: Zq1=70, Zq2=62, Zq3=58, X1=19, X2=17, and X3=16.

[0032] The input end, the output end and the locking end are as follows: a planet carrier (7) is used as the input end to connect to a power device. A ring gear (1) of the first planetary gear set is used as the output end to connect to a powered device. A ring gear (2) of the second planetary gear set and a ring gear (3) of the third planetary gear set are each used as a locking end to connect to a brake (8), as shown in FIG. 1.

[0033] The brakes are as follows: this embodiment adopts two brakes, each connected to a locking end. The brake is an electromagnetic brake and is controlled by a gear shift control device.

[0034] If a brake is controlled to brake, the center gear connected thereto will be locked, such that the rotation speed of the center gear is zero. If a brake is controlled not to brake, the center gear connected thereto will not be locked. When the brake (8) connected to the ring gear (3) of the third planetary gear set brakes, the transmission ratio is 62.222, which corresponds to a second gear. When the brake (8) connected to the ring gear (2) of the second planetary gear set brakes, the transmission ratio is 99.167, which corresponds to a first gear. When neither brake brakes, the gearbox is in neutral. The transmission ratios of the two gears of the gearbox in this embodiment are both very large, the transmission structure is simple, the control structure is simple, and the gears are controlled by controlling the braking of the two brakes. The gearbox in this embodiment may be used as a main reducer and a gearbox of a helicopter, and may develop a gear shift function of the helicopter.

[0035] Embodiment 2: An example of a gearbox according to the present invention with four planetary gear sets having the same type of center gears (ring gears). The gearbox includes a planetary gear set, a planetary gear set structure, an input end, an output end and a locking end, and brakes, among others.

[0036] The planetary gear set is as follows: this embodiment adopts four planetary gear sets having the same type of center gears (ring gears). Each planetary gear set is provided with a center gear and a planet carrier with a planetary gear. The center gears in the planetary gear sets are all ring gears, which are the same type of center gears. The number of planetary gear groups in the four planetary gear sets is 4. The planetary gear is a shaft, and the planet carrier is a bearing.

[0037] The planetary gear set structure is a star-connected planetary gear set structure. Suppose Zq1 represents the number of teeth of the ring gear in a first planetary gear set, Zq2 represents the number of teeth of the ring gear in a second planetary gear set, Zq3 represents the number of teeth of the ring gear in a third planetary gear set, Zq4 represents the number of teeth of the ring gear in a fourth planetary gear set, X1 represents the number of teeth of the planetary gear in the first planetary gear set, X2 represents the number of teeth of the planetary gear in the second planetary gear set, X3 represents the number of teeth of the planetary gear in the third planetary gear set, and X4 represents the number of teeth of the planetary gear in the fourth planetary gear set. In this embodiment, the number of gear teeth of the components is determined as: Zq1=82, Zq2=82, Zq3=78, Zq4=78, X1=33, X2=22, X3=19, and X4=17.

[0038] The input end, the output end and the locking end are as follows: a planet carrier (9) is used as the input end to connect to a power device. A ring gear (1) of the first planetary gear set is used as the output end to connect to a powered device. A ring gear (2) of the second planetary gear set, a ring gear (3) of the third planetary gear set, and a ring gear (4) of the fourth planetary gear set are each used as a locking end to connect to a brake (10), as shown in FIG. 3.

[0039] The brakes are as follows: this embodiment adopts three brakes, each connected to a locking end. The brake is an electromagnetic brake and is controlled by a gear shift control device.

[0040] If a brake is controlled to brake, the center gear connected thereto will be locked, such that the rotation speed of the center gear is zero. If a brake is controlled not to brake, the center gear connected thereto will not be locked. When the brake (10) connected to the ring gear (4) of the fourth planetary gear set brakes, the transmission ratio is −1.181, which corresponds to a third gear. When the brake (10) connected to the ring gear (3) of the third planetary gear set brakes, the transmission ratio is −1.533, which corresponds to a second gear. When the brake (10) connected to the ring gear (2) of the second planetary gear set brakes, the transmission ratio is −2.0, which corresponds to a first gear. When none of the three brakes brakes, the gearbox is in neutral. The gearbox controls the gear by controlling the braking of the three brakes. The pitches of the adjacent gears of the gearbox in this embodiment are approximately equal, and the deviation is less than 0.3%. The transmission structure is simple, the control structure is simple, and it can be used as a gearbox for a bicycle.

[0041] Embodiment 3: An example of a gearbox according to the present invention with five planetary gear sets having the same type of center gears (ring gears). The gearbox includes a planetary gear set, a planetary gear set structure, an input end, an output end and a locking end, and brakes.

[0042] The planetary gear set is as follows: this embodiment adopts five planetary gear sets having the same type of center gears (ring gears). Each planetary gear set is provided with a center gear and a planet carrier with a planetary gear. The center gears in the planetary gear sets are all ring gears, which are the same type of center gears. The number of planetary gear groups in the five planetary gear sets are all 4. The planetary gear is a shaft, and the planet carrier is a bearing.

[0043] The planetary gear set structure is a star-connected planetary gear set structure. Suppose Zq1 represents the number of teeth of the ring gear in a first planetary gear set, Zq2 represents the number of teeth of the ring gear in a second planetary gear set, Zq3 represents the number of teeth of the ring gear in a third planetary gear set, Zq4 represents the number of teeth of the ring gear in a fourth planetary gear set, Zq5 represents the number of teeth of the ring gear in a fifth planetary gear set, X1 represents the number of teeth of the planetary gear in the first planetary gear set, X2 represents the number of teeth of the planetary gear in the second planetary gear set, X3 represents the number of teeth of the planetary gear in the third planetary gear set, X4 represents the number of teeth of the planetary gear in the fourth planetary gear set, and X5 represents the number of teeth of the planetary gear in the fifth planetary gear set. The number of gear teeth of the components in this embodiment is determined as: Zq1=80, Zq2=84, Zq3=68, Zq4=60, Zq5=76, X1=19, X2=19, X3=17, X4=16, and X5=24.

[0044] The input end, the output end and the locking end are as follows: a planet carrier (11) is used as the input end to connect to a power device. A ring gear (1) of the first planetary gear set is used as the output end to connect to a powered device. A ring gear (2) of the second planetary gear set, a ring gear (3) of the third planetary gear set, a ring gear (4) of the fourth planetary gear set, and a ring gear (5) of the fifth planetary gear set are each used as a locking end to connect to a brake (12), as shown in FIG. 4.

[0045] The brakes are as follows: this embodiment adopts four brakes, each connected to a locking end. The brake is an electromagnetic brake and is controlled by a gear shift control device.

[0046] If a brake is controlled to brake, the center gear connected thereto will be locked, such that the rotation speed of the center gear is zero. If a brake is controlled not to brake, the center gear connected thereto will not be locked. When the brake (12) connected to the ring gear (5) of the fifth planetary gear set brakes, the transmission ratio is 4.034, which corresponds to a third gear. When the brake (12) connected to the ring gear (4) of the fourth planetary gear set brakes, the transmission ratio is 9.143, which corresponds to a second gear. When the brake (12) connected to the ring gear (3) of the third planetary gear set brakes, the transmission ratio is 20.0, which corresponds to a first gear. When the brake (12) connected to the ring gear (2) of the second planetary gear set brakes, the transmission ratio is −20.0, which corresponds to a reverse gear. When none of the four brakes brakes, the gearbox is in neutral. The gearbox controls the gear by controlling the braking of the four brakes. In this embodiment, pitches between adjacent gears of the gearbox with three forward gears and one reverse gear are approximately equal, and the deviation is less than 1.8%. The transmission structure is simple, and the control structure is simple, and it can be used as a gearbox for an automobile.

[0047] The gearbox in embodiment 3 may be connected in series with the gearbox in embodiment 2, like a main gearbox of a truck and an auxiliary gearbox being connected in series, forming a gearbox with nine forward gears and three reverse gears. The transmission ratios from the first forward gear to the ninth forward gear are: −40.0/−30.67/−23.63/−18.29/−14.02/−10.80/−8.08/−6.19/−4.77, respectively. The transmission ratio range is 8.39. The transmission ratios from the first reverse gear to the third reverse gear are: 40.0/30.67/23.63, respectively. Pitches between adjacent gears are approximately equal and the deviation is less than 2.7%. It is a constant ratio gearbox. It controls the gear by controlling the braking of seven brakes and can be used as a gearbox for an automobile.

[0048] Embodiment 4: An example of a gearbox according to the present invention with six planetary gear sets having the same type of center gears (ring gears). The gearbox includes a planetary gear set, a planetary gear set structure, an input end, an output end and a locking end, and brakes.

[0049] The planetary gear set is as follows: this embodiment adopts six planetary gear sets having the same type of center gears (ring gears). Each planetary gear set is provided with a center gear and a planet carrier with a planetary gear. The center gears in the planetary gear sets are all ring gears, which are the same type of center gears. The number of planetary gear groups in the six planetary gear sets are all 4. The planetary gear is a shaft, and the planet carrier is a bearing.

[0050] The planetary gear set structure is a star-connected planetary gear set structure. Suppose Zq1 represents the number of teeth of the ring gear in a first planetary gear set, Zq2 represents the number of teeth of the ring gear in a second planetary gear set, Zq3 represents the number of teeth of the ring gear in a third planetary gear set, Zq4 represents the number of teeth of the ring gear in a fourth planetary gear set, Zq5 represents the number of teeth of the ring gear in the fifth planetary gear set, Zq6 represents the number of teeth of the ring gear in a sixth planetary gear set, X1 represents the number of teeth of the planetary gear in the first planetary gear set, X2 represents the number of teeth of the planetary gear in the second planetary gear set, X3 represents the number of teeth of the planetary gear in the third planetary gear set, X4 represents the number of teeth of the planetary gear in the fourth planetary gear set, X5 represents the number of teeth of the planetary gear in the fifth planetary gear set, and X6 represents the number of teeth of the planetary gear in the sixth planetary gear set. The number of gear teeth of the components in this embodiment is determined as: Zq1=82, Zq2=74, Zq3=86, Zq4=82, Zq5=78, Zq6=78, X1=33, X2=23, X3=25, X4=22, X5=19, and X6=17.

[0051] The input end, the output end and the locking end are as follows: a planet carrier (13) is used as the input end to connect to a power device. A ring gear (1) of the first planetary gear set is used as the output end to connect to a powered device. A ring gear (2) of the second planetary gear set, a ring gear (3) of the third planetary gear set, a ring gear (4) of the fourth planetary gear set, a ring gear (5) of the fifth planetary gear set, and a ring gear (6) of the sixth planetary gear set are each used as a locking end to connect to a brake (14), as shown in FIG. 5.

[0052] The brakes are as follows: this embodiment adopts five brakes, each connected to a locking end. The brake is an electromagnetic brake and is controlled by a gear shift control device.

[0053] If a brake is controlled to brake, the center gear connected thereto will be locked, such that the rotation speed of the center gear is zero. If a brake is controlled not to brake, the center gear connected thereto will not be locked. When the brake (14) connected to the ring gear (6) of the sixth planetary gear set brakes, the transmission ratio is −1.181, which corresponds to a fifth gear. When the brake (14) connected to the ring gear (5) of the fifth planetary gear set brakes, the transmission ratio is −1.533, which corresponds to a fourth gear. When the brake (14) connected to the ring gear (4) of the fourth planetary gear set brakes, the transmission ratio is −2.0, which corresponds to a third gear. When the brake (14) connected to the ring gear (3) of the third planetary gear set brakes, the transmission ratio is −2.602, which corresponds to a second gear. When the brake (14) connected to the ring gear (2) of the second planetary gear set brakes, the transmission ratio is −3.392, which corresponds to a first gear. When none of the five brakes brakes, the gearbox is in neutral. The gearbox controls the gear by controlling the braking of the five brakes. Pitches between adjacent gears of the five-gear gearbox in this embodiment are approximately equal, and the deviation is less than 0.3%. The transmission structure is simple, the control structure is simple, and it can be used as a gearbox for a bicycle.

[0054] Embodiment 5: An example of a gearbox according to the present invention with three planetary gear sets having the same type of center gears (sun gears). The gearbox includes a planetary gear set, a planetary gear set structure, an input end, an output end and a locking end, and brakes.

[0055] The planetary gear set is as follows: this embodiment adopts three planetary gear sets having the same type of center gears (sun gears). Each planetary gear set is provided with a center gear and a planet carrier with a planetary gear. The center gears in the planetary gear sets are all sun gears, which are the same type of center gears. The number of planetary gear groups in the three planetary gear sets is 4. The planetary gear is a shaft, and the planet carrier is a bearing. Note: If the planetary gear is changed to be a bearing and the planet carrier to a shaft, reference may be made to FIG. 7.

[0056] The planetary gear set structure is a star-connected planetary gear set structure. Suppose Zt1 represents the number of teeth of the sun gear in a first planetary gear set, Zt2 represents the number of teeth of the sun gear in a second planetary gear set, Zt3 represents the number of teeth of the sun gear in a third planetary gear set, X1 represents the number of teeth of the planetary gear in the first planetary gear set, X2 represents the number of teeth of the planetary gear in the second planetary gear set, and X3 represents the number of teeth of the planetary gear in the third planetary gear set. In this embodiment, the number of gear teeth of the components is determined as: Zt1=20, Zt2=28, Zt3=36, X1=17, X2=24, and X3=31.

[0057] The input end, the output end and the locking end are as follows: a planet carrier (7) is used as the input end to connect to a power device. A sun gear (1) of the first planetary gear set is used as the output end to connect to a powered device. A sun gear (2) of the second planetary gear set and a sun gear (3) of the third planetary gear set are each used as a locking end to connect to a brake (8). These connections are achieved through multi-layer quill shafts, as shown in FIG. 6.

[0058] The brakes are as follows: this embodiment adopts two brakes, each connected to a locking end. The brake is an electromagnetic brake and is controlled by a gear shift control device.

[0059] If a brake is controlled to brake, the center gear connected thereto will be locked, such that the rotation speed of the center gear is zero. If a brake is controlled not to brake, the center gear connected thereto will not be locked. When the brake (8) connected to the sun gear (3) of the third planetary gear set brakes, the transmission ratio is 77.5, which corresponds to a second gear. When the brake (8) connected to the sun gear (2) of the second planetary gear set brakes, the transmission ratio is 120.0, which corresponds to a first gear. When neither brake brakes, the gearbox is in neutral. The gearbox controls the gear by controlling the braking of the two brakes. The transmission ratios of the two gears of the gearbox in this embodiment are both very large, the transmission structure is simple, the control structure is simple, and it can be used as a main reducer and a gearbox of a helicopter.

[0060] Embodiment 6: An example of a gearbox according to the present invention with four planetary gear sets having the same type of center gears (sun gears). The gearbox includes a planetary gear set, a planetary gear set structure, an input end, an output end and a locking end, and brakes.

[0061] The planetary gear set is as follows: this embodiment adopts four planetary gear sets having the same type of center gears (sun gears). Each planetary gear set is provided with a center gear and a planet carrier with a planetary gear. The center gears in the planetary gear sets are all sun gears, which are the same type of center gears. The number of planetary gear groups in the four planetary gear sets is 4. The planetary gear is a shaft, and the planet carrier is a bearing.

[0062] The planetary gear set structure is a star-connected planetary gear set structure. Suppose Zt1 represents the number of teeth of the sun gear in a first planetary gear set, Zt2 represents the number of teeth of the sun gear in a second planetary gear set, Zt3 represents the number of teeth of the sun gear in a third planetary gear set, Zt4 represents the number of teeth of the sun gear in a fourth planetary gear set, X1 represents the number of teeth of the planetary gear in the first planetary gear set, X2 represents the number of teeth of the planetary gear in the second planetary gear set, X3 represents the number of teeth of the planetary gear in the third planetary gear set, and X4 represents the number of teeth of the planetary gear in the fourth planetary gear set. In this embodiment, the number of gear teeth of the components is determined as: Zt1=26, Zt2=34, Zt3=34, Zt4=50, X1=17, X2=23, X3=24, and X4=39.

[0063] The input end, the output end and the locking end are as follows: a planet carrier (9) is used as the input end to connect to a power device. A sun gear (1) of the first planetary gear set is used as the output end to connect to a powered device. A sun gear (2) of the second planetary gear set, a sun gear (3) of the third planetary gear set, and a sun gear (4) of the fourth planetary gear set are each used as a locking end to connect to a brake (10). These connections are achieved through multi-layer quill shafts, as shown in FIG. 8.

[0064] The brakes are as follows: this embodiment adopts three brakes, each connected to a locking end. The brake is an electromagnetic brake and is controlled by a gear shift control device.

[0065] If a brake is controlled to brake, the center gear connected thereto will be locked, such that the rotation speed of the center gear is zero. If a brake is controlled not to brake, the center gear connected thereto will not be locked. When the brake (10) connected to the sun gear (4) of the fourth planetary gear set brakes, the transmission ratio is 6.183, which corresponds to a third gear. When the brake (10) connected to the sun gear (3) of the third planetary gear set brakes, the transmission ratio is 13.565, which corresponds to a second gear. When the brake (10) connected to the sun gear (2) of the second planetary gear set brakes, the transmission ratio is 29.90, which corresponds to a first gear. When none of the three brakes brakes, the gearbox is in neutral. The gearbox controls the gear by controlling the braking of the three brakes. Pitches between adjacent gears of the gearbox in this embodiment are approximately equal, and the deviation is less than 0.24%. The transmission structure is simple, the control structure is simple, and it can be used as a gearbox for an electric vehicle. It is easy for each gear to form a large transmission ratio, and all gears are decelerated transmission, which is a major advantage of the gearbox according to the present invention.

[0066] Embodiment 7: An example of a gearbox according to the present invention with five planetary gear sets having the same type of center gears (sun gears). The gearbox includes a planetary gear set, a planetary gear set structure, an input end, an output end and a locking end, and brakes.

[0067] The planetary gear set is as follows: this embodiment adopts five planetary gear sets having the same type of center gears (sun gears). Each planetary gear set is provided with a center gear and a planet carrier with a planetary gear. The center gears in the planetary gear sets are all sun gears, which are the same type of center gears. The number of planetary gear groups in the five planetary gear sets is 4. The planetary gear is a shaft, and the planet carrier is a bearing.

[0068] The planetary gear set structure is a star-connected planetary gear set structure. Suppose Zt1 represents the number of teeth of the sun gear in a first planetary gear set, Zt2 represents the number of teeth of the sun gear in a second planetary gear set, Zt3 represents the number of teeth of the sun gear in a third planetary gear set, Zt4 represents the number of teeth of the sun gear in a fourth planetary gear set, Zt5 represents the number of teeth of the sun gear in a fifth planetary gear set, X1 represents the number of teeth of the planetary gear in the first planetary gear set, X2 represents the number of teeth of the planetary gear in the second planetary gear set, X3 represents the number of teeth of the planetary gear in the third planetary gear set, X4 represents the number of teeth of the planetary gear in the fourth planetary gear set, and X5 represents the number of teeth of the planetary gear in the fifth planetary gear set. In this embodiment, the number of gear teeth of the components is determined as: Zt1=26, Zt2=34, Zt3=34, Zt4=50, Zt5=50, X1=17, X2=23, X3=24, X4=39, and X5=51.

[0069] The input end, the output end and the locking end are as follows: a planet carrier (11) is used as the input end to connect to a power device. A sun gear (1) of the first planetary gear set is used as the output end to connect to a powered device. A sun gear (2) of the second planetary gear set, a sun gear (3) of the third planetary gear set, a sun gear (4) of the fourth planetary gear set, and a sun gear (5) of the fifth planetary gear set are each used as a locking end to connect to a brake (12). These connections are achieved through multi-layer quill shafts, as shown in FIG. 9.

[0070] The brakes are as follows: this embodiment adopts four brakes, each connected to a locking end. The brake is an electromagnetic brake and is controlled by a gear shift control device.

[0071] If a brake is controlled to brake, the center gear connected thereto will be locked, such that the rotation speed of the center gear is zero. If a brake is controlled not to brake, the center gear connected thereto will not be locked. When the brake (12) connected to the sun gear (5) of the fifth planetary gear set brakes, the transmission ratio is 2.786, which corresponds to a fourth gear. When the brake (12) connected to the sun gear (4) of the fourth planetary gear set brakes, the transmission ratio is 6.183, which corresponds to a third gear. When the brake (12) connected to the sun gear (3) of the third planetary gear set brakes, the transmission ratio is 13.565, which corresponds to a second gear. When the brake (12) connected to the sun gear (2) of the second planetary gear set brakes, the transmission ratio is 29.90, which corresponds to a first gear. When none of the four brakes brakes, the gearbox is in neutral. The gearbox controls the gear by controlling the braking of the four brakes. Pitches between adjacent gears of the gearbox in this embodiment are approximately equal, and the deviation is less than 0.7%. The transmission structure is simple, the control structure is simple, and it can be used as a gearbox for a motor vehicle.

[0072] Embodiment 8: An example of a gearbox according to the present invention with six planetary gear sets having the same type of center gears (sun gears). The gearbox includes a planetary gear set, a planetary gear set structure, an input end, an output end and a locking end, and brakes.

[0073] The planetary gear set is as follows: this embodiment adopts six planetary gear sets having the same type of center gears (sun gears). Each planetary gear set is provided with a center gear and a planet carrier with a planetary gear. The center gears in the planetary gear sets are all sun gears, which are the same type of center gears. The number of planetary gear groups in the six planetary gear sets is 4. The planetary gear is a shaft, and the planet carrier is a bearing.

[0074] The planetary gear set structure is a star-connected planetary gear set structure. Suppose Zt1 represents the number of teeth of the sun gear in a first planetary gear set, Zt2 represents the number of teeth of the sun gear in a second planetary gear set, Zt3 represents the number of teeth of the sun gear in a third planetary gear set, Zt4 represents the number of teeth of the sun gear in a fourth planetary gear set, Zt5 represents the number of teeth of the sun gear in a fifth planetary gear set, Zt6 represents the number of teeth of the sun gear in a sixth planetary gear set, X1 represents the number of teeth of the planetary gear in the first planetary gear set, X2 represents the number of teeth of the planetary gear in the second planetary gear set, X3 represents the number of teeth of the planetary gear in the third planetary gear set, X4 represents the number of teeth of the planetary gear in the fourth planetary gear set, X5 represents the number of teeth of the planetary gear in the fifth planetary gear set, and X6 represents the number of teeth of the planetary gear in the sixth planetary gear set. In this embodiment, the number of gear teeth of the components is determined as: Zt1=26, Zt2=30, Zt3=34, Zt4=34, Zt5=50, Zt6=50, X1=17, X2=19, X3=23, X4=24, X5=39, and X6=51.

[0075] The input end, the output end and the locking end are as follows: a planet carrier (13) is used as the input end to connect to a power device. A sun gear (1) of the first planetary gear set is used as the output end to connect to a powered device. A sun gear (2) of the second planetary gear set, a sun gear (3) of the third planetary gear set, a sun gear (4) of the fourth planetary gear set, a sun gear (5) of the fifth planetary gear set, and a sun gear (6) of the sixth planetary gear set are each used as a locking end to connect to a brake (14). These connections are achieved through multi-layer quill shafts, as shown in FIG. 10.

[0076] The brakes are as follows: this embodiment adopts five brakes, each connected to a locking end. The brake is an electromagnetic brake and is controlled by a gear shift control device.

[0077] If a brake is controlled to brake, the center gear connected thereto will be locked, such that the rotation speed of the center gear is zero. If a brake is controlled not to brake, the center gear connected thereto will not be locked. When the brake (14) connected to the sun gear (6) of the sixth planetary gear set brakes, the transmission ratio is 2.786, which corresponds to a fourth gear. When the brake (14) connected to the sun gear (5) of the fifth planetary gear set brakes, the transmission ratio is 6.183, which corresponds to a third gear. When the brake (14) connected to the sun gear (4) of the fourth planetary gear set brakes, the transmission ratio is 13.565, which corresponds to a second gear. When the brake (14) connected to the sun gear (3) of the third planetary gear set brakes, the transmission ratio is 29.90, which corresponds to a first gear. When the brake (14) connected to the sun gear (2) of the second planetary gear set brakes, the transmission ratio is −30.875, which corresponds to a reverse gear. When none of the five brakes brakes, the gearbox is in neutral. The gearbox controls the gear by controlling the braking of the five brakes. In this embodiment, pitches between adjacent gears of the gearbox with four forward gears and one reverse gear are approximately equal, and the deviation is less than 0.7%. The transmission structure is simple, and the control structure is simple, and it can be used as a motor vehicle gearbox.

[0078] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and there are various changes and improvements to the present invention without departing from the spirit and scope of the present invention, and these changes and improvements all fall within the scope to be protected of the present invention. The scope of protection of the present invention is defined by the appended claims and equivalents.