Gear-tooth system and shaft/hub connection component

Abstract

A gear-tooth system can be produced on a component of a shaft/hub connection. The component can have a first axis of rotation and a gear-tooth system; wherein the gear-tooth system of the component comprises a plurality of teeth, disposed next to one another along a circumference direction, wherein a tooth interstice is disposed between two teeth, in each instance, and each tooth has a head region and a flank region, in each instance, between head region and a foot region disposed in the tooth interstice, wherein the tooth interstice has a tooth gap width in the flank region; wherein the gear-tooth system has at least a first region and subsequently a second region along an axial direction parallel to the first axis of rotation; wherein the first region has a first tooth gap width and the second region has a second tooth gap width, which is less in comparison.

Claims

1. A method for producing a gear-tooth system in a final state on a component of a shaft/hub connection; wherein the method comprises at least the following steps: a) providing the component in a first initial state, wherein the component has a first axis of rotation and the gear-tooth system in an initial state, wherein the gear-tooth system in the initial state comprises a plurality of teeth, which are disposed next to one another along a circumference direction, wherein a tooth interstice is disposed between two teeth, in each instance, and each tooth has a head region and a flank region, in each instance, disposed between head region and a foot region disposed in the tooth interstice, wherein the tooth interstice has a tooth gap width in the flank region; wherein the gear-tooth system in the initial state has at least a first region and subsequently a second region along an axial direction parallel to the first axis of rotation, wherein the gear-tooth system has a second tooth gap width in the first region and in the second region; and b) machining at least the first region and enlarging the second tooth gap width to form a first tooth gap width, wherein, after Step b), the component has the gear-tooth system in the final state; wherein, after Step b), the first region has the first tooth gap width, and the second region has the second tooth gap width, which is less in comparison; wherein Step b) is carried out using a rolling tool; and wherein a different tool is used for producing the first tooth gap width than for producing the gear-tooth system in the initial state or for producing the second tooth gap width.

2. The method according to claim 1, wherein: the rolling tool is a rolling rod, which is moved at least transverse to the first axis of rotation relative to the component to produce the gear-tooth system in the final state; or the rolling tool is a roller burnishing tool having at least one rolling wheel, wherein the rolling wheel has a second axis of rotation that runs parallel to the first axis of rotation.

3. The method according to claim 2, wherein the rolling tool is the roller burnishing tool, wherein the at least one rolling wheel is moved at least transverse to the axial direction, at an infeed speed, for producing an engagement into the gear-tooth system in the initial state, wherein immediately before contact of the at least one rolling wheel and component, at least the component rotates about the first axis of rotation or the at least one rolling wheel rotates about the second axis of rotation.

4. The method according to claim 3, wherein the infeed speed is at least 0.2 millimeters per second.

5. The method according to claim 3, wherein a rotational speed of the component is at least 100 revolutions per minute during Step b).

6. The method according to claim 3, wherein further comprising, between Step a) and b), introducing, within the first region, a groove that runs along the circumference direction into the gear-tooth system in the initial state.

7. The method according to claim 3, wherein during Step b), a material of the component is displaced out of the flank region, at least in a radial direction, at least toward the head region or toward the foot region, at least in the first region.

Description

BRIEF SUMMARY OF THE DRAWINGS

(1) The disclosure will be explained in greater detail below, using the attached figures. It should be pointed out that the invention is not supposed to be restricted by the exemplary embodiments mentioned. In particular, it is also possible, unless explicitly stated otherwise, to extract partial aspects of the facts explained in the figures and to combine them with other integral parts and knowledge from the present description. In particular, it should be pointed out that the figures and the size ratios shown are only schematic. The figures show:

(2) FIG. 1: a shaft and a hub for producing a shaft/hub connection, in a side view, partly in section;

(3) FIG. 2: a detail of the shaft according to FIG. 1 in a side view, in section;

(4) FIG. 3: an apparatus for producing the gear-tooth system on a shaft, in a side view;

(5) FIG. 4: a shaft having a gear-tooth system, in a view along the axial direction;

(6) FIG. 5: a change in the gear-tooth system by means of Step b) of the method, shown using a cross-section; in a view along the axial direction;

(7) FIG. 6: a detail of a gear-tooth system of a shaft/hub connection, in a perspective view;

(8) FIG. 7: multiple embodiment types of a gear-tooth system geometry, shown using different teeth of a shaft; in a perspective view;

(9) FIG. 8: a roller burnishing tool for machining the gear-tooth system according to Step b), in engagement with a component, in a side view, in section;

(10) FIG. 9: a progression of machining the gear-tooth system according to FIG. 8, in a side view, in section;

(11) FIG. 10: a rolling wheel of the roller burnishing tool according to FIGS. 8 and 9 in a view along a second axis of rotation; and

(12) FIG. 11: the rolling wheel according to FIG. 10 in a side view, in section.

DESCRIPTION

(13) FIG. 1 shows a shaft 28 and a hub 29 for producing a shaft/hub connection 3, in a side view, partly in section.

(14) Shaft 28 and hub 29 each have a gear-tooth system 1, by way of which they are connected with one another (relative to the circumference direction 6, with shape fit). At least one of shaft 28 and hub 29 (here at least the shaft 28) is the component 2 described. To form the shaft/hub connection 3, the shaft 28 and the hub 29 (of the component shaft 28 and of the component hub 29; here, an end face, in each instance) can be displaced relative to and toward one another, along an axial direction 13, by way of a first component end 30. The first region 14 of the gear-tooth system 1 of the shaft 28 is disposed between the first component end 30 of the component 2 and the second region 15 of the component 2 (the shaft 28).

(15) If shaft 28 and hub 29 are disposed one on top of the other, in other words displaced toward one another, first the first region 14 of the gear-tooth system 1 of the component 2 (here the shaft 28) will come into engagement with the gear-tooth system 1 of the other component (here the hub 29). The first region 14 has the enlarged tooth gap width, so that assembly of the shaft/hub connection 3 is simplified.

(16) In this regard, the gear-tooth systems 1 (of shaft 28 and hub 29) first form a greater fit (for example a play fit) with one another when forming the shaft/hub connection 3 (if only the first region 14 is in engagement with the respectively other gear-tooth system 1). During further displacement of shaft 28 and hub 29 relative to one another and when a predetermined end position 31 is reached, the gear-tooth systems 1 form a tighter fit (for example a press fit) with one another, at least in the second region 15 of the gear-tooth system 1 of the component 2.

(17) FIG. 2 shows a detail of the shaft 28 according to FIG. 1 in a side view, in section. FIG. 3 shows an apparatus for producing the gear-tooth system 1 on a shaft 28, in a side view. FIG. 4 shows a shaft 28 having a gear-tooth system 1, in a view along the axial direction 13. FIG. 5 shows a change in the gear-tooth system 1 by means of Step b) of the method, represented using a cross-section; in a view along the axial direction 13. FIG. 6 shows a detail of a gear-tooth system 1 of a shaft/hub connection 3, in a perspective view. FIG. 7 shows multiple embodiment types of a gear-tooth system geometry, represented for different teeth 5 of a shaft 28; in a perspective view. FIGS. 2 to 7 will be described together hereinafter.

(18) The gear-tooth system 1 is a straight gear-tooth system, in which the teeth 5 extend exclusively along the axial direction 13.

(19) The component 2 forms a gear wheel having an outer gear-tooth system. The gear-tooth system 1 has a uniform division. The gear-tooth system 1 of the component 2 comprises a plurality of (equally configured) teeth 5, which are disposed next to one another along a circumference direction 6, wherein a tooth interstice 7 is disposed between two teeth 5, in each instance, and each tooth 5 has a head region 8 and a flank region 10, disposed between head region 8 and a foot region 9 disposed in the tooth interstice 7, in each instance. The tooth interstice 7 has a tooth gap width 11, 12 in the flank region 10. The gear-tooth system 1 has at least a first region 14 and subsequently a second region 15 along an axial direction 13 that lies parallel to the first axis of rotation 4.

(20) The first region 14 has a first tooth gap width 11, and the second region 15 has a second tooth gap width 12, which is less, in comparison. The tooth gap width 11, 12 changes along a radial direction 24, between head region 8 and foot region 9 of the teeth 5 (see FIG. 4). Here, the (first and second) tooth gap width 11, 12 is determined at the same distance from the first axis of rotation 4, in each instance. The tooth gap width 11, 12 is determined in the flank region 10 of the teeth 5. A partial circle 32 (or rolling circle) extends through the flank region 10.

(21) The gear-tooth system 1 according to FIGS. 2 and 7 is structured with steps (in other words differently structured foot regions 9 of the gear-tooth system 1).

(22) According to the method for producing the gear-tooth system 1, according to Step a), the component 2 is made available in an initial state, wherein the component 2 has the gear-tooth system 1, and the gear-tooth system 1 has the (narrower) second tooth gap width 12 in the first region 14 and in the second region 15. According to Step b), machining of the first region 14 and enlargement of the second tooth gap width 12 to form the first tooth gap width 11 takes place (see FIGS. 2, 5, and 7).

(23) Within the first region 14, a groove 22 that runs along the circumference direction 6 is introduced into the gear-tooth system 1. The groove 22 reaches deeper into the component 2 than the foot region 9 of the gear-tooth system 1.

(24) During Step b), a material 23 of the component 2 is displaced, at least in the first region 14, out of the flank region 10, in a radial direction 24, at least toward the head region 8 or toward the foot region 9. In FIG. 5, it is shown that the gear-tooth system 1 has a second tooth gap width 12 before Step b) (first contour 33 of the gear-tooth system 1). After Step b), the gear-tooth system has a first tooth gap width 11 (second contour 34). It is evident that material 23 of the component 2 was displaced out of the flank region 10 into the head region 8 and into the foot region 9.

(25) A transition region 35 is provided between the first region 14 and the second region 15, in which the first tooth gap width 11 is continuously reduced, along the axial direction 13, toward the second tooth gap width 12. To implement this transition region 35, the rolling tool can have a corresponding shape, for example, so that an increasingly lesser engagement between rolling tool and gear-tooth system 1 of the component 2 takes place toward the edge of the rolling tool (see FIG. 11, shown there using a rolling wheel 18).

(26) In FIG. 3, it is shown that the shaft 28 is disposed in a clamping arrangement on both sides, and is machined, at both component ends 30, using a rolling tool to produce the gear-tooth system 1.

(27) Here, only the second tooth gap width 12 is produced by way of the rolling tool (in other words the state of the shaft 28 before Step b) of the method). Machining according to Step b) can take place in a similar clamping arrangement, with different rolling wheels 18.

(28) A rolling wheel 18 having a second axis of rotation 19 (left rolling tool) can be used as a rolling tool (see also FIGS. 8 to 11) or a rolling rod 16 (right rolling tool) can be used, which is moved transverse to the first axis of rotation 4 relative to the component 2. A function of the rolling rod is explained in DE 11 2005 003 630 B4, for example.

(29) In FIG. 6, it is shown that if shaft 28 and hub 29 are disposed one on top of the other, in other words displaced toward one another, first the first region 14 of the gear-tooth system 1 of the component 2 comes into engagement with the gear-tooth system 1 of the other component of shaft 28 and hub 29. The first region 14 has the enlarged first tooth gap width 12, so assembly of the shaft/hub connection 3 is simplified by means of the greater play 36 in the flank region 10.

(30) In FIG. 7, multiple types of a gear-tooth system geometry are shown. The teeth 5 extend along the axial direction 13, proceeding from the first component end 30. In the foot region 9 of the gear-tooth system 1, steps are arranged in the second region.

(31) The tooth 5 shown on the left extends along the axial direction 13 with a flank region 10 that runs parallel to the axial direction 13. In interplay with similar teeth 5, a constant first tooth gap width 11 is formed in this way, along the axial direction 13, in the first region 14.

(32) In the case of the center tooth 5, the flank regions 10 run at an angle relative to the axial direction 13, so that in interplay with similar teeth 5, a first tooth gap width 11 that is continuously reduced is implemented. The first tooth gap width 11 is continuously reduced, proceeding from a first region end 25 of the first region 14 (here at the first component end 30) and toward the second region 15, over the entire first region 14.

(33) The center tooth 5 is structured conically, at least in the first region 14, i.e. it widens continuously toward the second region 15.

(34) In the case of the right tooth 5, only a partial region 26 of the first region 14 is structured conically, so that the tooth 5 widens continuously toward the second region 15 only in the partial region 26.

(35) The partial region 26 is disposed directly at the first region end 25, wherein a remaining region 27 having a constant first tooth gap width 11 (in other words with flank regions 10 of the teeth 5 that run parallel to the axial direction 13) is disposed between the partial region 26 and the second region 15. The remaining region 27 is part of the first region 14. The remaining region 27 is disposed between the partial region 26 and the groove 22.

(36) In the case of all the teeth 5 of the different gear-tooth systems shown, the transition region 35 is disposed directly following the groove 22 and toward the second region 15.

(37) The transition region 35 of each tooth 5 is disposed between the first region 14 and the second region 15 and structured like the partial region 26 of the right two teeth 5, wherein in the transition region 35, the first tooth gap width 11 is reduced to the second tooth gap width 12.

(38) For all the gear-tooth systems 1 shown, it holds true that in the entire first region 14, the first tooth gap width 11 is greater than the second tooth gap width 12 in the second region 15.

(39) The gear-tooth system 1 extends, proceeding from a first region end 25 (disposed at the first component end 30) of the first region 14, along the axial direction 13, over the first region 14 (and the groove 22), over a transition region 35, and over the second region 15.

(40) FIG. 8 shows a roller burnishing tool 17 for machining the gear-tooth system 1 according to Step b), in engagement with a component 2, in a side view, in section. FIG. 9 shows a progression of machining of the gear-tooth system 1 according to FIG. 8, in a side view, in section. FIGS. 8 and 9 will be described together hereinafter. Reference is made to the explanations regarding FIGS. 1 to 7.

(41) The rolling tool is a roller burnishing tool 17, wherein the two rolling wheels 18 for producing the engagement into the gear-tooth system 1 on component 2 are moved at least transverse to the axial direction 13, at an infeed speed 19. Immediately before contact of rolling wheels 18 and component 2, at least the component 2 rotates about the first axis of rotation 4.

(42) Here, only the component 2 is driven, so that a rotational movement of the component 2 is transferred to the rolling wheels 18.

(43) The roller burnishing tool 17 is moved toward the component 2 at an infeed speed 19, wherein within the scope of this infeed movement, the contact, the engagement into the gear-tooth system 1 (in other words the interaction between gear-tooth system 1 on the rolling wheel 18 and on the component 2) and, if applicable, also the transfer of the rotational movement from the one part to the other part takes place.

(44) In FIG. 9, the broken-line representation of the rolling wheel 18 represents the position of the rolling wheel 18 at the moment of production of the first contact between the gear-tooth system 1 of the rolling wheel 18 and the gear-tooth system 1 of the component 2. The representation of the rolling wheel with a solid line represents the position of the rolling wheel 18 when machining of the gear-tooth system 1 in the first region 14 according to Step b) of the method has just taken place. During the advancing movement of the rolling wheels 18 along a direction transverse to the axial direction 13 or transverse to the first axis of rotation 4, the rolling wheels 18 are disposed at a constant distance from one another.

(45) FIG. 10 shows a rolling wheel 18 of the roller burnishing tool 17 according to FIGS. 8 and 9 in a view along a second axis of rotation 19 of the rolling wheel 18. FIG. 11 shows the rolling wheel 18 according to FIG. 10 in a side view, in section. FIGS. 10 and 11 will be described together hereinafter. Reference is made to the explanations regarding FIGS. 1 to 9.

(46) The rolling wheel 18 has a gear-tooth system 1 for forming the first tooth gap width 11.

(47) A transition region 35 can be provided between the first region 14 and the second region 15, in which the first tooth gap width 11 is continuously reduced in size along the axial direction 13, toward the second tooth gap width 12. To implement this transition region 35, the rolling tool (here the rolling wheel 18) can have a corresponding shape, so that increasingly lesser engagement between rolling tool and gear-tooth system 1 of the component 2 occurs toward the edge of the rolling tool. Here, the rolling wheel 18 has a transition region 35 described in connection with FIG. 7.

REFERENCE SYMBOL LIST

(48) 1 gear-tooth system 2 component 3 shaft/hub connection 4 first axis of rotation 5 tooth 6 circumference direction 7 tooth interstice 8 head region 9 foot region 10 flank region 11 first tooth gap width 12 second tooth gap width 13 axial direction 14 first region 15 second region 16 rolling rod 17 roller burnishing tool 18 rolling wheel 19 second axis of rotation 20 infeed speed 21 rotational speed 22 groove 23 material 24 radial direction 25 first region end 26 partial region 27 remaining region 28 shaft 29 hub 30 first component end 31 end position 32 partial circle 33 first progression 34 second progression 35 transition region 36 play 37 step