CN111306266A - Transmission and motor vehicle - Google Patents

Abstract

The invention relates to a transmission for a motor vehicle having a chain, a drive member assembly driven via the chain and a driven member assembly driven via the chain, at least one chain as a drive member assembly or part of a driven member assembly The wheel and the axially movable member axially next to the sprocket, characterized in that the sprocket is supported on the axially movable member via a pretensioning device. Furthermore, the invention relates to a motor vehicle.

Description

Transmissions and Motor Vehicles

technical field

The invention relates to a transmission for a motor vehicle having a chain, a drive member assembly driven via the chain and a driven member assembly driven via the chain, at least one drive member assembly as part of the drive member assembly and the driven member assembly A sprocket and an axially movable member axially next to the sprocket.

Background technique

Due to the ever-increasing component densities in motor vehicles, it is also necessary to arrange the individual components spatially separated from each other. Therefore, in order to connect these components to each other via a certain route, it is also known to connect these components by means of chains. The electric motor used as the second drive unit can be connected, for example, via a chain to other parts of the drive train and thus drive the motor vehicle.

In addition, however, the chain can also be used to drive auxiliary units, such as pumps.

In all cases, the chain connection is a critical connection because the oblique position of the chain needs to be avoided. Here, tipping can already cause problems with the chain drive at one point.

Therefore, the installation of sprockets, or more generally teeth, for engagement to a chain has heretofore been limited. In particular, it is not possible to mount components that are axially movable.

SUMMARY OF THE INVENTION

Proceeding from this, the object of the present invention is to provide a transmission in which the sprockets are freely positionable.

In order to solve this problem, it is proposed that in a transmission of the type mentioned at the outset, the sprocket is supported on the axially movable component via a pretensioning device. In this way, despite the axial movement of the axially movable member, a fixed position of the sprocket with respect to the chain is ensured, thereby ensuring the operational reliability of the transmission.

Here, every device having teeth for engagement into a chain is considered a sprocket. Here, for example, it can also refer to a housing in which the toothing is arranged on the outside.

Advantageously, the preloading device can be configured as a spring. Here, in particular stamped spring elements can be used. Alternatively, wave springs can also be used.

Advantageously, the spring can be embedded in the sprocket by means of a web. Correspondingly, there is a positive fit between the pretensioning device and the sprocket.

Preferably, the axially movable member and the sprocket are rotatably connected. With this connection, the sprocket is connected in a rotationally fixed manner with the axially movable member, and the driving or driven of the sprocket is associated with the axially movable member. In this case, the connection can advantageously be designed as a form-fit connection, in particular as a meshing connection. Here, the sprocket can advantageously have internal toothing.

Correspondingly, the axially movable member may have a gear with external teeth.

Preferably, the axially movable member may be part of a clutch assembly. In particular, the axially movable member may be a housing section of a clutch assembly. The clutch assembly may be a dry clutch, a wet-running clutch or a corresponding dual clutch assembly composed of the aforementioned clutches. In addition, the clutch assembly may also consist of multiple claw clutches or one claw clutch.

Preferably, the sprocket can be supported on a bearing, in particular a plain bearing. Easy axial displaceability of the sprocket is achieved by being supported on a bearing. In particular, small axial movements can thus be quickly compensated again by the spring element.

Advantageously, the sprocket can be supported on the side facing away from the axially movable member by means of a thrust disc. The friction in the circumferential direction is also reduced by means of the thrust disc.

Advantageously, the movement of the sprocket on the side facing away from the axially movable member may be limited. That is to say, there is a stop here, towards which the sprocket moves in this direction during the axial movement. As described, there may be a thrust disc for reducing friction between the fixed stop and the sprocket.

Advantageously, a gear can be fixed on said axially movable member. The gear can preferably be fixedly welded to the axially movable member. In particular, the toothed wheel has complementary toothing, in particular external toothing, to the sprocket.

The toothed portion of course refers to the toothed portion for the connection between the sprocket and the axially movable member. There are additional teeth on the sprocket for engaging in the chain.

Advantageously, the driven member assembly may have an oil pump. That is, in this configuration, the chain drives the oil pump, and the drive is on the clutch side.

As described, it can alternatively also be provided that an electric motor is arranged on the drive side, in which case a clutch housing can also be present on the output side.

Preferably, the sprocket can be supported on a hub, in particular a hub of a clutch assembly. The hub may in particular be an oil supply hub, ie a hub with bores for supplying oil.

Preferably, the oil pump may be located in the clutch bell housing. The clutch bell housing is the part of the transmission housing in which the clutch is also arranged. Due to the tight space conditions, the oil pump is preferably arranged radially outside in the clutch bell housing. For the connection to the radially central oil supply hub and correspondingly also the radially central sprocket, the connection is preferably via a chain.

Furthermore, the invention relates to a motor vehicle with a transmission. The motor vehicle is characterized in that the transmission is constructed as described.

Description of drawings

Further advantages, features and details of the invention emerge from the following description of the exemplary embodiments and figures. In the attached picture:

Figure 1 shows a partial view of the transmission,

FIG. 2 shows a partial view according to FIG. 1 in cross section.

Detailed ways

FIG. 1 shows a partial view of the transmission 1 , more precisely in the region of the clutch assembly 2 . A gear 4 is welded to the housing 3 of the clutch assembly 2 , which gear is engaged with the sprocket 5 . In this case, the gear wheel 4 has an external toothing 6 and the sprocket 5 has an internal toothing 7 , via which the toothed wheel and the sprocket are in engagement with each other.

The gear 4 is preferably fixed welded to the housing or fixed to the housing in any other way. By interconnecting the sprocket and the gear wheel 4 in an axially movable manner via the meshing connection 8 , the sprocket can move freely due to the air gap 9 between the housing 3 and the sprocket 5 . In order to obtain a fixed positioning of the sprocket 5, a pretensioning device 10 is provided. In the embodiment shown in FIG. 1 , this pretensioning device is fastened to the housing and moves the sprocket away from the housing 3 . Alternatively, the pretensioning device can also be fastened to the sprocket 5 and pressed against the housing 3 . Here, the sprocket 5 is pressed against the spacer plate 12 by the pretensioning device 10 . The spacer plate 12 refers to the wall in the transmission 1 which serves, in particular, to support the shafts. Additionally, the spacer plate may help to isolate the interior space in the clutch bell housing from the rest of the transmission housing. Here, a plain bearing 14 is present radially within the sprocket 5 , and a thrust plate 16 is present axially beside this sprocket. In this way, the chain wheel 5 is supported on the spacer plate 12 and there is also a stop there, wherein the friction between the chain wheel 5 and the spacer plate 12 can be reduced by means of the plain bearing 14 and the thrust plate 16 .

It is not known from FIG. 1 itself whether the drive is radially outward or radially inward via the sprocket 5 . In the embodiment shown, radially outside there is an oil pump 18 which is driven via the sprocket 5 and the chain 20 . That is to say, in this configuration, the torque is transmitted from the clutch assembly 2 to the oil pump 18 via the chain 20 . Thus, the sprocket 5 and clutch assembly 2 are on this side of the drive member assembly 22 . In contrast, the oil pump 18 is on this side of the driven member assembly 24 .

Due to the problem described at the outset, namely the precise positioning of the sprocket 5 in the axial direction, even in the case of an axially movable component, which is next to the sprocket 5 and is therefore largely unsuitable for The sprocket 5 is supported and, therefore, it does not matter whether the sprocket 5 is on the side of the drive member assembly 22 or on the side of the driven assembly 24 . Instead of the oil pump 18 , there can also be an electric motor on this side of the chain, which is driven via the chain 20 .

It is pointed out that the sprocket is also on this side of the component assembly 24 which is not described in detail. However, since the sprocket is usually mounted in a fixed position, there are absolutely no problems with regard to possible axial movements.

Advantageously, independently of the specific design shown in FIG. 1 , the sprocket loaded by means of the pretensioning device is preferably radially inner with respect to the transmission.

FIG. 2 shows a section through the transmission 1 according to FIG. 1 at the level of line A. FIG. Here, the pretensioning device in the form of a spring 26 can be seen. The pretensioning device is in a form-locking connection with the sprocket 5 by means of the pin 28 . Furthermore, a meshing connection 8 in the form of an outer toothing 6 and an inner toothing 7 can be seen.

List of reference signs

1 tranny

2 clutch pack

3 shell

4 gears

5 sprockets

6 External teeth

7 Internal teeth

8 Engagement connection

9 Air gap

10 Preload device

12 Spacer

14 Plain bearings

16 Thrust plate

18 Oil pump

20 chains

22 Drive member assembly

24 Driven member assembly

26 spring

28 pins

Claims (16)

1. A transmission (1) for a motor vehicle, the transmission having a chain (20), a drive member assembly (22) driven via the chain (20) and a driven output driven via the chain (20) A member assembly (24), at least one sprocket (5) as part of said drive member assembly (22) or said driven member assembly (24) and axially beside said sprocket (5) The axially movable member (2) is characterized in that the sprocket (5) is supported on the axially movable member (2) via a pretensioning device (10). 2 . The transmission according to claim 1 , wherein the pretensioning device ( 10 ) is configured as a spring ( 26 ). 3 . 3. The transmission according to claim 1 or 2, characterized in that the axially movable member (2) and the sprocket (5) are rotatably connected. 4 . The transmission according to claim 3 , wherein the connection is designed as a positive connection, in particular as a meshing connection ( 8 ). 5 . 5 . The transmission according to claim 1 , wherein the sprocket ( 5 ) has internal teeth ( 7 ). 6 . 6. Transmission according to one of the preceding claims, characterized in that the axially movable member is part of a clutch assembly (2) or is a clutch assembly (2). 7 . The transmission according to claim 4 , wherein the sprocket ( 5 ) is supported on a bearing, in particular a plain bearing ( 14 ). 8 . 8 . The transmission according to claim 1 , wherein the sprocket ( 5 ) is supported by a thrust plate ( 16 ) on the side facing away from the axially movable member. 9 . 9. The transmission according to one of the preceding claims, characterized in that a gearwheel (4) is fixed to the axially movable member (2). 10. The transmission according to claim 9, characterized in that the gear (4) is fixedly welded. 11. The transmission according to claim 9 or 10, characterized in that the gear (4) has external teeth (6). 12 . The transmission as claimed in claim 1 , wherein the driven member assembly ( 24 ) has an oil pump ( 18 ). 13 . 13. Transmission according to claim 12, characterized in that the oil pump (18) is arranged in a clutch bell housing. 14. The transmission of one of the preceding claims, wherein the drive member assembly (22) comprises a clutch assembly (2). 15. The transmission according to one of the preceding claims, characterized in that the sprocket (5) is supported on the partition wall (12). 16. Motor vehicle with transmission, characterized in that the transmission (1) is constructed according to one of the preceding claims.

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