STEPLESS POWER SPLIT TRANSMISSION

Abstract

A continuously variable power-branched transmission has a shaft (4) that can be coupled to a drive motor, where the drive motor is connected to at least one variator (1). In order to obtain forward and reverse driving operation, the drive motor is coupled by way of spur gear pairs that can be engaged by means of driving direction clutches (KV, KR) to a drive output (13). The driving direction clutches (KV, KR) are arranged a distance apart.

Claims

1. A continuously variable power-branched transmission, comprising: at least one variator (1) connected to a drive machine; gearwheel pairs configured to be engaged by a first driving direction clutch (KV) and a second driving direction clutch (KR); a shaft (4) configured to be coupled to the drive machine and to a drive output (13) in order to produce forward and reverse driving operation by way of the gearwheel pairs, wherein, in the area of a change-speed transmission (8) at least two driving ranges can be obtained, within which ranges a gear ratio can be adjusted continuously by means of the at least one variator (1), and wherein an auxiliary power takeoff (9) is provided having a summation gearset (7) which is functionally connected to a drive input shaft (5); wherein the first driving direction clutch (KR) arranged coaxially with the change-speed transmission (8) and the second driving direction clutch (KV) is arranged a distance away from the first driving direction clutch (KR), and the drive input shaft (5) passes through one of the first or second driving direction clutches.

2. The continuously variable power-branched transmission according to claim 1, wherein a first gear ratio obtained with the first driving direction clutch (KR) is different from a second gear ration obtained with the second driving direction clutch (KV).

3. The continuously variable power-branched transmission according to claim 1, wherein the drive input shaft (5) is functionally connected with the at least one variator (1) by way of spur gears (Z1, Z2a, Z2b, Z3).

4. The continuously variable power-branched transmission according to claim 1, wherein the drive input shaft (5) is configured to drive hydraulic pumps by way of spur gears (Z1, Z2a, Z2b, Z3, 14, 15, 16, 17).

5. The continuously variable power-branched transmission according to claim 3, wherein at least two spur gears (Z2a, Z2b) are in the form of a double spur gear.

6. The continuously variable power-branched transmission according to claim 5, wherein a spur gear (Z10) which is functionally connected to the drive output (13), is arranged between the spur gears (Z2a, Z2b) of the double spur gear.

7. The continuously variable power-branched transmission according to claim 1, wherein the shaft (4) is functionally connected by way of a spur gear stage with spur gears (Z26, Z27, Z28) to the drive input shaft (5).

8. The continuously variable power-branched transmission according to claim 1, wherein the summation gearset (7) and the change-speed transmission (8) are arranged coaxially.

9. The continuously variable power-branched transmission according to claim 1, wherein the power-branched transmission is configured as a primarily coupled transmission.

10. The continuously variable power-branched transmission according to claim 1, wherein the at least one variator (1) comprises units (2, 3) which are in the form of hydraulic or electrical units and are functionally connected with one another.

11. The continuously variable power-branched transmission according to claim 4, wherein at least two spur gears (Z2a, Z2b) are in the form of a double spur gear.

12. The continuously variable power-branched transmission according to claim 11, wherein a spur gear (Z10) which is functionally connected to the drive output (13), is arranged between the spur gears (Z2a, Z2b) of the double spur gear.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0016] Further features emerge from the description of the sole figure.

DETAILED DESCRIPTION

[0017] The sole figure shows a primarily coupled power-branched transmission with a continuously variable power branch which comprises a variator 1 for the continuous variation of a gear ratio of the power-branched transmission. The variator 1 comprises a unit 2 and a unit 3, wherein the units 2 and 3 can be in the form of hydraulic units, so-termed hydrostats, or electrical units. A drive motor (not shown), for example an internal combustion engine or an electric motor, can be connected to the shaft 4 in order to drive the shaft 4. The shaft 4 is connected rotationally fixed to the spur gear Z27. The spur gear Z27 meshes with the spur gear Z28. The spur gear Z28 is connected rotationally fixed to the drive input shaft 5. In that way the drive motor is arranged a distance away from the input shaft 5. The input shaft 5 is connected rotationally fixed to a ring gear 6 of the summation gearset 7. However, the input shaft 5 also passes through the summation gearset 7 and the change-speed transmission 8 and is connected rotationally fixed to the spur gear Z1, so forming the drive input for an auxiliary power takeoff 9.

[0018] The summation gearset 7 is in the form of a planetary gearset and is arranged coaxially with the change-speed transmission 8. The auxiliary power takeoff 9 is arranged opposite the shaft 4, thus on the other side of the power-branched transmission. The change-speed transmission 8 comprises a number of planetary gearsets and shifting clutches, by means of which several driving ranges can be engaged. Preferably, four driving ranges can be engaged.

[0019] The summation gearset 7 comprises a sun gear 11 which is connected rotationally fixed to a spur gear 10. The spur gear 10 meshes with the spur gear 12. The spur gear 12 is connected rotationally fixed by way of a shaft to the unit 2. The driving direction clutch KR is arranged coaxially with the change-speed transmission and is connected on one side rotationally fixed to a component with the spur gear Z6 and on the other side to a component with the spur gear Z10. The spur gear Z6 meshes with the spur gear Z27, which is connected rotationally fixed to part of the driving direction clutch KV. Thus, the driving direction clutch KV is arranged a distance away from and not coaxially with the driving direction clutch KR. A component of the driving direction clutch KV is connected rotationally fixed to the spur gear Z8. The spur gear Z8 meshes with the spur gear Z9. However, the spur gear Z9 also meshes with the spur gear Z10. The spur gear Z9 is connected to the drive output 13, which for example can drive a rear axle and/or a front axle of a towing vehicle. If the driving direction clutch KV is actuated in the closing direction and the driving direction clutch KV is actuated in the opening direction, then the shaft 4 drives the drive output 13 by way of the power-branched transmission in a first driving direction. Since the gear ratios of the spur gears Z6 and Z7 are different, the driving direction clutch KV or KR can be acted upon with more torque or less torque with the same output power, depending on the gear ratio chosen.

[0020] The shaft 5 is connected rotationally fixed to the spur gear Z1, which meshes with the spur gear Z2b of the double spur gear. The spur gear Z2a is connected rotationally fixed to the spur gear Z2b of the double spur gear. The spur gear Z10 is arranged between the spur gear Z2a and the spur gear Z2b.

[0021] The spur gear Z2b meshes with the spur gear Z3. The spur gear Z3 is connected rotationally fixed to the unit 3 of the variator 1.

[0022] The spur gear Z3 is connected rotationally fixed to the spur gear 14. The spur gear 14 meshes with the spur gear 15. The spur gear 15 meshes with the spur gear 16. The spur gear 16 meshes with the spur gear 17. The spur gear 17 is connected rotationally fixed to a pump and the spur gear 16 is connected rotationally fixed to a pump. By means of the clutch 18 the auxiliary power takeoff 9 can be engaged. By way of the spur gear 19 a further drive axle of the vehicle can be driven.

INDEXES

[0023] 1 Variator [0024] 2 Unit [0025] 3 Unit [0026] 4 Shaft [0027] 5 Drive input shaft [0028] 6 Ring gear [0029] 7 Summation gearset [0030] 8 Change-speed transmission [0031] 9 Auxiliary power takeoff [0032] 10 Spur gear [0033] 11 Sun gear [0034] 12 Spur gear [0035] 13 Drive output [0036] 14 Spur gear [0037] 15 Spur gear [0038] 16 Spur gear [0039] 17 Spur gear [0040] 18 Clutch [0041] 19 Spur gear [0042] 20 Drive output shaft [0043] Z1 Spur gear [0044] Z2a Spur gear [0045] Z2b Spur gear [0046] Z3 Spur gear [0047] Z6 Spur gear [0048] Z7 Spur gear [0049] Z8 Spur gear [0050] Z9 Spur gear [0051] Z10 Spur gear [0052] Z26 Spur gear [0053] Z27 Spur gear [0054] Z28 Spur gear [0055] KV Driving direction clutch [0056] KR Driving direction clutch