DE102016210654A1 - Gear arrangement for a vehicle - Google Patents

Abstract

In vehicles, transmissions are used to change gear ratios between the traction motor and the driven wheels. In addition to transmissions with continuously changing gear ratios, most transmissions work as manual transmissions. In the manual transmissions idler gears with drive shafts are rotatably set or decoupled depending on the desired translation. In the coupled state, a torque path from the traction motor to the driven wheels via the respective idler gear, in the decoupled state, the torque path is passed through other transmission components. It is an object of the present invention to propose an improved storage of idler gears. For this purpose, a transmission assembly 1 with a transmission shaft 2, with a first idler gear 3, with a first bearing means 7 for supporting the first idler gear 3 on the transmission shaft 2, wherein the first bearing means 7 is formed as a radial bearing, and with a second bearing means 8 for Bearing of the first idler gear 3, wherein the second bearing means 8 is formed as a thrust bearing, and proposed with a second idler gear 4, wherein the second idler gear 4 is rotatably mounted on the gear shaft 2 and supports the second bearing means 8 in the axial direction.

Description

The invention relates to a transmission arrangement with a transmission shaft, with a first idler gear, with a first bearing means for supporting the first idler gear on the gear shaft, wherein the first bearing means is formed as a radial bearing, and with a second bearing means for supporting the first idler gear, wherein the second bearing device is designed as a thrust bearing.

In vehicles, transmissions are used to change gear ratios between the traction motor and the driven wheels. In addition to transmissions with continuously changing gear ratios, most transmissions work as manual transmissions. In the manual transmissions idler gears with drive shafts are rotatably set or decoupled depending on the desired translation. In the coupled state, a torque path from the traction motor to the driven wheels via the respective idler gear, in the decoupled state, the torque path is passed through other transmission components.

Thus, the idler gears must first be designed so that they are rotationally fixed in a coupling with the transmission shaft and in the decoupled state can rotate freely relative to the transmission shaft on which they are arranged.

The publication EP 2 551 537 B1 , which probably forms the closest prior art, relates to a Losradlagerung for a motor vehicle transmission. In the Losradlagerung is provided that the idler gear is supported by a needle bearing with respect to the transmission shaft and by means of a thrust bearing relative to a support body of a synchronization device.

It is an object of the present invention to propose an improved storage of idler gears.

This object is achieved by a gear arrangement with the features of claim 1. Advantageous or preferred embodiments of the invention will become apparent from the dependent claims, the following description and the accompanying drawings.

The invention relates to a transmission arrangement which is suitable and / or designed for a vehicle. In particular, the gear assembly is disposed in a drive train between the traction motor of the vehicle and the driven wheels of the vehicle. The gear assembly may be formed as a gear change gearbox, manual transmission, automatic transmission, etc.

The gear arrangement has a gear shaft, which is designed to guide a torque, in particular a traction torque, of the vehicle, at least in some operating states of the gear arrangement. The transmission shaft defines a major axis in the transmission assembly.

The gear arrangement has a first idler gear, wherein the first idler gear is rotatably mounted on the gear shaft at least in an uncoupled state. In particular, gear shaft and the first idler gear are arranged coaxially and / or concentrically with each other and / or to the main axis.

The gear arrangement has a first bearing device for mounting the first idler gear on the transmission shaft. In principle, it is possible that the first bearing device is designed as a sliding bearing device. However, it is preferred that the first bearing device is realized as a roller bearing device. The first bearing device is designed as a radial bearing. In particular, the first bearing device is arranged coaxially with the transmission shaft and between the transmission shaft and the first idler gear.

The gear arrangement has a second bearing device for mounting the first idler gear. Thus, the first idler gear forms a bearing partner with respect to the second bearing device. The second bearing device may be formed as a sliding bearing device. However, it is preferred that the second bearing device is designed as a Wälzkörperlagereinrichtung. It is provided that the second bearing device is designed as an axial bearing. In particular, the second bearing device supports the idler gear in a plane which is formed as a radial plane to the main axis of the transmission shaft.

In the context of the invention, it is proposed that the gear arrangement has a second idler gear. The second idler gear is rotatably mounted on the same gear shaft at least in an uncoupled state. It is envisaged that the second loose wheel supports the second bearing device in the axial direction. In particular, the second idler gear forms a bearing partner in the second bearing device. Thus, the second bearing device between the first idler gear and the second idler gear is arranged, wherein the first and the second idler gear against each other, in particular mutually and / or mutually supported in the axial direction.

It is a consideration of the invention that a particularly compact implementation of the gear arrangement can be realized by the mutual support of the two idler gears. It is not absolutely necessary that between the first and second idler gear a gear shaft fixed paragraph or section is arranged, which on the one hand supports the first idler gear against the gear shaft in the axial direction and the other the second idler gear relative to the transmission shaft in the axial direction. Rather, the second bearing device is arranged as a thrust bearing between the two loose wheels in a very simple implementation, so that the two idler gears can be supported against each other. This ensures a very compact and at the same time reliable storage of the loose wheels.

In a preferred embodiment of the invention, the first bearing device is designed as a ball bearing device. Particularly preferably, the first bearing device is realized as a single-row ball bearing device. By using a ball bearing device, axial receiving space in the region of the first bearing device can be saved. Particularly preferably, the first bearing device is arranged on the edge side of the first idler gear. Specifically, the first bearing device is positioned with respect to the axial direction at an edge opposite to the second bearing device.

In this context, it is particularly preferred that the first bearing device is designed as an angular contact ball bearing device. It is advantageous that a pressure angle of a pressure line of the angular contact ball bearing device with respect to the second bearing means is arranged in an O-shape and / or that the pressure line of the pressure angle intersects the radial plane of the second bearing means in a pitch circle diameter, which is larger than the pitch circle diameter of the first bearing means is trained. In this embodiment, a slip and low-friction angular contact ball bearing can be used. For unloading loads in directions perpendicular to the pressure line of the first bearing device, the second bearing device can be used, so that the first idler gear is mounted load-bearing.

In a possible embodiment, the second bearing device is designed as a roller bearing device. For example, the second bearing device can be realized as a needle bearing device. The rollers or needles are arranged as a wreath. In this embodiment, the second bearing device can be designed to save space in relation to the axial direction and still receive corresponding loads in the axial direction.

In a further possible embodiment of the invention, the second bearing device is designed as a ball bearing device. In this embodiment, depending on the realization of the ball bearing device, the pressure angles of the printing lines can also be set differently from the roller bearing device. In this embodiment, it is particularly preferred that the second bearing device is realized as a four-point bearing device, wherein the printing lines are arranged crossed.

Particularly preferred is in particular a combination, wherein the first bearing device is designed as an angular contact ball bearing device as described above and the second bearing device is designed as a four-point bearing device as described above.

Alternatively, an advantageous combination, wherein the first bearing device as a roller bearing device, in particular needle bearing device, and the second bearing device is also realized as a roller bearing device, in particular needle bearing device.

A further possible combination results from the fact that the first bearing device has been described above as an angular ball bearing device such as this and the second bearing device is designed as a roller bearing device, in particular a needle bearing device.

With regard to the load-compatible design, all combinations have the advantage that the first and the second bearing device can jointly absorb loads in all directions.

With regard to the receiving space, the structure of the gear arrangement, in particular the described combinations, the advantage or the property that under the first idler gear and in particular with respect to the axial direction considered between the first bearing means and the second bearing means forms a receiving space, which not occupied by the storage facilities.

This structural condition can be utilized by integration of further components in the gear arrangement:
In a preferred embodiment of the invention, it is preferred that the gear arrangement has a sliding sleeve - also called sliding sleeve - which is designed for the positive coupling of the transmission shaft with the first idler gear. The sliding sleeve is arranged in the receiving space below the first idler gear.

Thus, by the special design of the storage facilities initially the receiving space created or enabled and subsequently occupied by the sliding sleeve.

It is particularly preferred that the sliding sleeve has an internal toothing and the transmission shaft has an external toothing, which is in engagement with the internal toothing of the sliding sleeve. The teeth are designed so that the sliding sleeve and gear shaft are arranged rotatably in the direction of rotation about the transmission shaft to each other, but can be moved in the axial direction to each other.

Particularly preferably, the first idler gear on a side facing away from the first bearing means on a coupling toothing, which is arranged on the radial inner circumference. In contrast, the sliding sleeve on a counter coupling toothing, which can be brought into engagement with the coupling tooth by an axial displacement of the sliding sleeve for coupling the transmission shaft and the first idler gear. The sliding sleeve is actuated for example by means of a switching shaft, which is arranged in the transmission shaft and which is coupled via a connecting element displaceable with the sliding sleeve. Preferably, the coupling toothing is formed as an internal toothing and the counter coupling toothing as an external toothing.

Thus, the particular bearing arrangement of the gear assembly has the advantage that initially a receiving space under the first idler gear is created by the distribution of the bearing device, which is subsequently used by the integration of the sliding sleeve for coupling between the gear shaft and the first idler gear.

In the previously described embodiment, the gear arrangement thus forms a form-fitting coupling between the first idler gear and the gear shaft.

In a preferred development of the invention, the gear arrangement comprises a friction ring device for non-positive coupling of the sliding sleeve with the idler gear. The friction ring device may, for example, have one or more friction cones. The friction ring device is arranged coaxially and / or concentrically with the sliding sleeve. In particular, the friction ring device is supported by the sliding sleeve, preferably exclusively by the sliding sleeve. The friction ring device is arranged in the receiving space described above. With this development, it is possible to form the gear arrangement as a highly compact and at the same time reliable synchronization arrangement.

In a preferred structural embodiment of the invention, the first idler gear on a gear portion and a bearing portion, wherein the gear portion carries a idler gear. The idler gear may be formed as a spur toothing or as a helical toothing. In particular, the idler gear is formed as a radially outwardly directed external toothing. The bearing section is supported on the first bearing device. Optionally, the bearing portion can be supported on an outer ring of the first bearing means or alternatively form a raceway for the first bearing means, which is integrally formed in the bearing portion, for example, as a surface. In a longitudinal section along the main axis, the first idler gear is L-shaped with respect to the gear portion and the bearing portion. The standing leg of the "L" is formed by the gear portion, the lying leg of the "L" is formed by the bearing portion. At the free end of the lying leg, the first bearing means is arranged, on the standing leg of the L is arranged on the side facing away from the leg lying the second bearing means. In particular, the first idler gear with an axial end face forms a support surface or raceway for the second bearing device.

In a preferred embodiment of the invention, the second idler gear is formed as the first idler gear, but may e.g. have a different pitch circle diameter for the idler gear. Thus, the second loose wheel optionally also has a sliding sleeve and / or a friction ring device, which are arranged in a receiving space. The first idler gear and the second idler gear are preferably arranged opposite to each other, wherein the gear portions are arranged immediately adjacent to each other and support each other via the second bearing means in the axial direction. Thus, a synchronization arrangement for two idler gears can be implemented in highly compact design.

Further features, advantages and effects of the invention will become apparent from the following description of preferred embodiments of the invention and the accompanying figures. Showing:

1 a gear arrangement for a vehicle, wherein the storage facilities are designed as any storage facilities;

2 a gear assembly for a vehicle, wherein the bearing means are formed as ball bearing means;

3 in the same representation as in 1 wherein the storage facilities are designed as needle bearing devices;

4 in the same representation as the preceding figures, wherein the one bearing device is designed as a ball bearing device and the other bearing device as a needle bearing device.

The 1 shows in a schematic longitudinal sectional view along a main axis H a gear arrangement 1 as a first embodiment of the invention. The gear arrangement 1 has a gear shaft 2 which is arranged coaxially with the main axis H. The transmission shaft 2 is designed in particular as a hollow shaft.

On the gear shaft 2 are a first loose wheel 3 and a second idler gear 4 arranged. Each of the loose wheels 3 . 4 carries a idler gear 5 . 6 , which is directed radially outward with respect to the main axis H and which is circumferential to the respective idler gear 3 . 4 is trained. Thus form the loose wheels 3 . 4 each spur gears.

The first idler gear 3 is in relation to the gear shaft 2 via a first storage facility 7 rotatably mounted. Thus, the first idler wheel forms 3 a bearing partner and the gear shaft 2 a storage partner with respect to the first storage facility 7 ,

Furthermore, the first idler gear 3 opposite the second idler gear 4 via a second storage facility 8th stored. This forms the first loose wheel 3 a bearing partner and the second idler gear 4 a storage partner with respect to the second storage facility 8th , The second idler gear 4 is opposite the gear shaft 2 via a third storage facility 9 stored. Thus forms with respect to the third storage facility 9 the second idler gear 4 a bearing partner and the gear shaft 2 a warehouse partner.

In the longitudinal section shown are the first and the second idler gear 3 . 4 each formed L-shaped, wherein the first idler gear is formed as a mirrored L. Thus, the standing legs of the L border each other and are supported against each other via the second bearing device 8th from. The lying legs are on the other hand facing away from each other.

The first idler gear 3 can be in terms of its axial extent in a bearing section 10 , which the idler gear 5 carries and in a first bearing section 11 , about which the first idler wheel 3 on the first storage facility 7 supports, subdivide. Similarly, the second idler gear can be 4 in a second gear section 12 , which the idler gear 6 carries and in a second storage section 13 subdivide, which on the third storage facility 9 rests.

By the storage of the loose wheels 3 . 4 to each other via the second bearing device 8th a very compact design can be achieved. In the event that the second storage facility 8th is designed as a Wälzkörpereinrichtung, for example, be provided that the rolling elements directly on an axial end face of the first and / or second idler gear 3 . 4 roll off. But even in the event that the rolling elements on a bearing disk as part of the second bearing device 8th roll off, is the axial space for the second storage facility 8th very narrow.

The first storage facility 7 or the third storage facility 9 are each at the edge of the bearing section 11 respectively 13 arranged. This creates a first or second recording room 13 . 14 which is radially inward of the first and second idler wheels respectively 3 . 4 is arranged. The recording room 13 respectively 14 is each formed as an annulus. On one axial side is the receiving space 13 respectively 14 through the first storage facility 7 or by the third storage facility 9 completed. On the side facing each other has the first idler gear 3 or the second idler gear 4 a coupling toothing 15 respectively 16 which are directed radially inward and which the receiving space 13 respectively 14 limit in the axial direction.

Inside the recording room 13 is a first sliding sleeve 17 , inside the recording room 14 is a second sliding sleeve 18 arranged. In the first recording room 13 is a friction ring device 19 arranged in the second recording room 14 is a second friction ring device 20 arranged. The sliding sleeve 17 respectively 18 has in each case an internal toothing, which in an external toothing of the transmission shaft 2 intervenes so that the sliding sleeve 17 respectively 18 slidable in the axial direction, but is arranged rotationally fixed in the direction of rotation.

The sliding sleeve 17 respectively 18 have a negative feedback toothing 21 respectively 22 on which in the coupling teeth 15 . 16 can engage, so that a form-fitting connection in the direction of rotation can take place. The operation of the sliding sleeve 17 . 18 via a connecting element, which is controlled via a switching or operating shaft, which in the transmission shaft 2 is arranged. The friction ring devices 19 respectively 20 are coaxial and / or concentric with the first sliding sleeve 17 or the second sliding sleeve 18 arranged. The friction ring devices 19 . 20 serve a frictional connection between the first sliding sleeve and the first idler gear 3 or the second sliding sleeve 18 and the second idler gear 4 manufacture. The friction ring devices 19 . 20 serve to a speed of the gear shaft 2 to a speed of the first and second idler gear 3 . 4 equalize.

Due to the edge-side positioning of the first bearing device 7 or the second storage facility 8th is the recording room 13 respectively 14 created the sliding sleeve 17 respectively 18 and / or the friction ring device 19 respectively 20 in the first idler gear 3 or in the second idler gear 4 to be able to integrate.

There are various options for designing the storage facilities:
In the 2 a first embodiment is shown, wherein the first storage device 7 and the third storage facility 9 are each formed as an angular contact ball bearing, wherein represent their pressure line in an O-arrangement. The second storage facility 8th is designed as a four-point bearing.

In the 3 a second embodiment is shown, wherein the first storage device 7 and the third storage facility 9 like in the 2 is executed, the second storage device 8th However, it is designed as an axial needle bearing.

In the 4 are both the first storage facility 7 , the third storage facility 9 designed as a radial needle bearing, the second bearing device 8th is realized as an axial needle bearing.

LIST OF REFERENCE NUMBERS

1

 transmission assembly

2

 gear shaft

3

 first idler gear

4

 second idler gear

5

 Losradverzahnung

6

 Losradverzahnung

7

 first storage facility

8th

 second storage facility

9

 third storage facility

10

 bearing section

11

 gear portion

12

 gear portion

13

 bearing section

13

 accommodation space

14

 accommodation space

15

 coupling teeth

16

 coupling teeth

17

 first sliding sleeve

18

 second sliding sleeve

19

 first friction ring device

20

 second friction ring device

21

 Negative feedback teeth

22

 Negative feedback teeth

H

 main axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2551537 B1 [0004]

Claims (10)

Gear arrangement ( 1 ) with a transmission shaft ( 2 ), with a first loose wheel ( 3 ), with a first storage facility ( 7 ) for the storage of the first idler gear ( 3 ) on the transmission shaft ( 2 ), wherein the first storage device ( 7 ) is formed as a radial bearing, with a second bearing device ( 8th ) for the storage of the first idler gear ( 3 ), the second storage device ( 8th ) is formed as an axial bearing, characterized by a second loose wheel ( 4 ), wherein the second loose wheel ( 4 ) on the transmission shaft ( 2 ) is rotatably arranged and the second bearing means ( 8th ) in the axial direction. Gear arrangement ( 1 ) according to claim 1, characterized in that the first storage device ( 7 ) is designed as a ball bearing device. Gear arrangement ( 1 ) according to claim 2, characterized in that the first storage device ( 7 ) is formed as an angular contact ball bearing device. Gear arrangement ( 1 ) according to one of the preceding claims, characterized in that the second bearing device ( 8th ) is formed as a roller bearing device. Gear arrangement ( 1 ) according to one of the preceding claims 1 to 3, characterized in that the second bearing device ( 8th ) is designed as a ball bearing device. Gear arrangement ( 1 ) according to claim 5, characterized in that the second bearing device ( 8th ) is formed as a four-point bearing device. Gear arrangement ( 1 ) according to one of the preceding claims, characterized by a first sliding sleeve ( 17 ) for the positive coupling of the transmission shaft ( 2 ) with the first loose wheel ( 3 ), whereby under the first loose wheel ( 3 ) a first recording room ( 13 ) is formed, wherein in the first receiving space ( 13 ) the first sliding sleeve ( 17 ) is arranged. Gear arrangement ( 1 ) according to claim 7, characterized by a first friction ring device ( 19 ) for frictional coupling of the sliding sleeve ( 17 ) with the first loose wheel ( 3 ), wherein the first friction ring device ( 19 ) in the first recording room ( 13 ) is arranged. Gear arrangement ( 1 ) according to one of the preceding claims, characterized in that the first idler gear ( 3 ) a gear section ( 11 ) and a storage section ( 10 ), wherein the gear section ( 11 ) a idler gear ( 5 ) and the bearing section ( 10 ) on the first storage facility ( 7 ), wherein the first receiving space ( 13 ) under the gear section ( 11 ) is arranged. Gear arrangement ( 1 ) according to one of the preceding claims, characterized in that the first idler gear ( 3 ) on an axial end face a support surface for the second bearing device ( 8th ) and the storage section ( 10 ) is arranged on the opposite side.

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