DE102019100397A1 - Release device for a clutch of a motor vehicle - Google Patents

Abstract

The disengaging device (1) for a clutch of a motor vehicle, the disengaging device (1) has a housing (6, 8) in which at least one piston (4) operatively connected to a disengaging bearing (3) of the disengaging device (1) is accommodated to actuate the clutch via the release bearing (3), the housing (6, 8) having a central opening (5) for receiving an input or output shaft therein, the release device (1) having a support bearing (16 , 17, 18) with which it can be supported radially and axially on the input or output shaft. Furthermore, the invention also relates to a clutch for a motor vehicle with such a release device.

Description

The present invention relates to a disengaging device for a clutch of a motor vehicle, the disengaging device having a housing in which at least one piston which is operatively connected to a disengaging bearing of the disengaging device is received in order to actuate the clutch via the disengaging bearing, the housing having a central opening for receiving an input or output shaft therein. Furthermore, the invention also relates to a clutch for a motor vehicle with such a release device.

Disengaging devices for clutches of motor vehicles are generally known from the prior art and are also referred to as CSC. Disengaging devices of this type serve to press a clutch disc operatively connected to a drive unit of the motor vehicle, for example an internal combustion engine or an electric motor, against a corresponding clutch disc of an output of the motor vehicle, for example a transmission shaft. In the case of a hydraulically actuated disengaging device, this can be effected in particular by means of a piston which is accommodated in a housing of the disengaging device and which can be acted upon by a hydraulic fluid, such as oil or brake fluid, via a connecting piece which can be connected to a hydraulic line. The disengaging device thus comprises the slave cylinder of the clutch, which is coupled via a pressure line to a master cylinder which can be actuated by the driver of the motor vehicle via a pedal.

It is known in principle to arrange and fasten a conventional CSC on a gearbox rear wall or to arrange a cover-tight CSC on the clutch cover and to connect it. In the latter embodiment, the housing of the release device is attached to a cover of the clutch via a cover bearing / support bearing, so that the entire release device hangs on the cover of the clutch. Such disengagement devices are also referred to as cover-releasers or cover-releasers. A slightly modified embodiment of such a cover-releasing device is from the DE 10 2010 051 152 A1 known. In the cover-fixed disengaging device disclosed there, a housing, in which at least one annular piston is received, which is connected at a first end to a disengaging bearing, is provided coaxially with the at least one annular piston with a channel or a passage opening for the passage of a transmission shaft, a Area of the channel is designed as a guide for additional storage of the housing and thus the disengaging device only in the radial direction on the gear shaft in addition to the lid-fixed mounting.

Known cover-fixed disengagement devices can have the disadvantage that they require and take up a relatively large amount of space in the axial direction. A further disadvantage can be that strong vibrations occur when a clutch is operated and can be introduced into the housing of the actuating device. As a result, damage to, for example, connecting elements to the bell of the coupling, lines or the like can occur.

The object of the invention is to avoid or at least alleviate the disadvantages of the prior art and, in particular, to provide a disengaging device which requires a relatively small installation space compared to known disengaging devices, in particular in the axial direction, which is easy to assemble and which largely Vibration-resistant mounting and storage enables.

The object of the invention is achieved in a generic disengaging device in that the disengaging device has a support bearing with which it can be supported radially and axially on the input or output shaft. It is also achieved by a clutch for a motor vehicle with a release device according to the invention, in particular according to the present description and according to one of the appended claims.

According to the invention, the disengaging device is thus essentially position-defined, in particular completely position-defined, and can be supported or supported on the input or output shaft. This storage is particularly stable, robust vibration and easy to install in an advantageous manner. The housing can also be made smaller, since it does not have to provide a connection structure to the clutch cover. The support bearing can be formed with a smaller diameter than in known cover-fixed disengagement devices, which promotes stability and robustness against vibrations and saves weight and space. Due to the bearing both in the axial and at the same time in the radial direction, vibrations introduced into the coupling can be absorbed in almost any direction. In addition, the shaft is freely rotatable in the support bearing and can be rotated almost without resistance, so that the rotation of the shaft is not impaired by the release device. The disengaging device is in particular mounted exclusively by means of the support bearing and, moreover, has no further support bearing, in particular it cannot be stored or supported on a clutch cover or gear cover.

Advantageous embodiments are claimed in the subclaims and are explained below.

An embodiment is characterized in that the release bearing is arranged radially outside the support bearing. This enables a particularly compact design of the release device and a particularly advantageous flow of force between the bearings.

According to a further embodiment, the release bearing can be arranged axially nested with the support bearing in the unactuated state of the release device. This variant enables an advantageous flow of force and high stability in the unactuated state. Alternatively, it can be arranged axially nested with the support bearing in the actuated state of the disengaging device. This variant enables an advantageous flow of force and a high stability in the actuated state. In both variants, the installation space required for the support bearing and the release bearing is small.

A particularly space-saving embodiment can be achieved according to the invention in that the support bearing is designed in the form of a shoulder roller bearing. It is also particularly advantageous that both the axial and the radial support / mounting of the disengaging device on the input or output shaft are carried out with only a single bearing. In addition, such a storage by means of a shoulder roller bearing is particularly easy to assemble, inexpensive and easily adjustable with regard to bearing play.

In the context of the invention, the shaft accommodated in the central opening of the housing can in particular be a gear shaft. The release device according to the invention can be mounted directly or indirectly on it. In the first case, an assembly-friendly arrangement can be achieved particularly easily. In the second case, particularly high stability and shrinkage robustness can be achieved.

A further embodiment of the invention is characterized in that the disengaging device comprises a hydraulic connection and / or a hydraulic line for hydraulic medium for actuating the piston in the housing. In one variant, the hydraulic connection or the hydraulic line can be arranged on the housing, in particular in the radial direction. According to another variant, he or she can be arranged on the housing in the axial direction.

The housing can be designed as a one-part or multi-part housing. A multi-part variant can have advantages in terms of ease of installation. The housing can be designed both as a plastic component, which is inexpensive and light, as well as a sheet metal part or consist of one or more sheet metal parts, in particular shaped sheet metal parts, which brings about greater stability with a small space at the same time.

It is particularly advantageous if the piston is arranged radially outside of the release bearing and / or the support bearing. This enables a tilt-stable actuation of the release device. Alternatively, the piston can be arranged radially within the release bearing and / or the support bearing. The disengaging device according to the invention can in particular have a plurality of pistons which are arranged in a circumferential direction around the axis of rotation of the support bearing. Alternatively, it can have a single or double ring piston, which is positioned about a longitudinal axis of the disengaging device.

In particular, the piston, the release bearing and the support bearing can be arranged axially and nested in this order from radially inside to radially outside. In the embodiment of the invention, a preload spring can be arranged in the pressure chamber of the piston housing, namely radially outside or radially inside the piston, which in this case is preferably designed as an annular piston. In further embodiments, a preload spring can be arranged outside the pressure chamber radially inside or radially outside the piston or the pistons.

In one embodiment of the coupling according to the invention, the support bearing can be arranged on a first component that is fixed to the drive shaft or output shaft. It can also be braced in particular by means of a spacer ring in a manner defining an axial position with a second component that is fixed to the drive shaft or output shaft. In this way, a particularly easy to assemble, simple and precisely defined axial position positioning of the support bearing and thus of the disengaging device is made possible.

It can also be said that in order to save installation space, the invention provides for the DFA (cover-releaser) / the disengaging device to be supported directly via a bearing (actuating bearing) on the transmission input shaft. The actuating bearing can in particular be arranged radially outside the support bearing and axially nested with it. The supply line (from hydraulic fluid) to the piston can be radial or axial. The piston can in particular be mounted radially inside or outside the actuation bearing and the support bearing. It is particularly advantageous if all three (piston, release bearing and support bearing) are nested axially and radially in this order. In addition, one can say that a DFA according to the invention is not on the clutch cover as in the standard design known from the prior art is fixed, but via a support bearing on the gear shaft. Due to the fact that the release bearing can be arranged above the support bearing, a small axial installation space can be achieved.

• 1 eine Längsschnittansicht durch eine erfindungsgemäße Ausrückvorrichtung in einer ersten Ausführungsform in einem ausgerückten Zustand;
• 2 eine Längsschnittansicht durch die Ausrückvorrichtung der ersten Ausführungsform gemäß 1 in einem eingerückten Zustand;
• 3 eine Längsschnittansicht durch eine erfindungsgemäße Ausrückvorrichtung in einer zweiten Ausführungsform in einem ausgerückten Zustand;
• 4 eine Längsschnittansicht durch eine erfindungsgemäße Ausrückvorrichtung in einer dritten Ausführungsform in einem eingerückten Zustand;
• 5 eine Längsschnittansicht durch eine erfindungsgemäße Ausrückvorrichtung in einer vierte Ausführungsform in einem eingerückten Zustand; und
• 6 eine Längsschnittansicht durch eine erfindungsgemäße Ausrückvorrichtung in einer fünfte Ausführungsform in einem eingerückten Zustand.

The invention is explained in more detail below with the aid of figures in which different embodiments are shown. Show it:

• 1 a longitudinal sectional view through a disengaging device according to the invention in a first embodiment in a disengaged state;
• 2nd a longitudinal sectional view through the disengaging device according to the first embodiment 1 in an indented condition;
• 3rd a longitudinal sectional view through a disengaging device according to the invention in a second embodiment in a disengaged state;
• 4th a longitudinal sectional view through a disengaging device according to the invention in a third embodiment in an engaged state;
• 5 a longitudinal sectional view through a disengaging device according to the invention in a fourth embodiment in an engaged state; and
• 6 a longitudinal sectional view through a disengaging device according to the invention in a fifth embodiment in an engaged state.

The figures are merely schematic in nature and serve only to understand the invention. The same elements are provided with the same reference symbols.

Features of the individual exemplary embodiments can also be implemented in other exemplary embodiments. So they are interchangeable.

1 shows a first embodiment of a disengaging device according to the invention 1 for a clutch, not shown, of a motor vehicle in a disengaged state in a longitudinal section. The release device 1 includes a housing 2nd in which one with a release bearing 3rd operatively connected ring piston 4th is recorded. The ring piston 4th serves over the release bearing 3rd to actuate the clutch. The housing 2nd has a continuous central opening 5 to accommodate a gear shaft, not shown, in it. The housing 2nd consists essentially of a sheet metal ring carrier 6 with a radially inner bearing section 7 . The sheet metal ring carrier 6 carries a piston housing connected radially on the outside 8th with a housing inner wall 9 and a housing outer wall 10th . Between the inside wall of the housing 9 and the housing outer wall 10th is the ring piston 4th in the axial direction to the piston housing 8th added relative positionable.

The ring piston 4th stands over a sheet metal ring 11 with an outer ring 12th of the release bearing 3rd in operative connection. The release bearing 3rd is designed as a shoulder roller bearing and stands with its inner ring 13 with a pressure pot 14 in operative connection, via which the clutch is ultimately actuated. An actuation of the release device 1 by pressurizing the ring piston 4th is by a preload spring 15 supports the one hand on the sheet metal ring carrier 6 and on the other hand on the sheet metal ring 11 is supported.

In the storage section 7 of the sheet metal ring carrier 6 or the housing 2nd is an outer ring 16 a support bearing 17th held. This is also designed as a shoulder roller bearing, and its inner ring 18th is fixed in the radial as well as in the axial direction on a gear shaft fixed component 19th arranged. The fastening of the inner ring defined in the axial direction 18th is made using a spacer ring ground to size 20 reached, on another gear shaft-fixed component 21 is present. The component 19th and the component 21 are by means of a screw connection 22 clamped together, such that over the spacer ring 20 and an investment shoulder 23 of the component 19th the inner ring 18th is clamped in a defined position. Overall, this is the entire release device 1 by means of the support bearing 17th both in the radial and in the axial direction via the gear shaft-fixed component 19th mounted on the gear shaft.

The embodiment of the 1 and 2nd has a radially outer pressure chamber, ie piston housing 8th with ring pistons accommodated in it 4th , the preload spring 15 is positioned radially within it. The piston housing 8th exists with its inner wall 9 and housing outer wall 10th made of plastic. A hydraulic connection 24th or pressure connection 24th is axial to the axis of the ring piston 4th arranged.

In the embodiments of the 3rd and 4th is the preload spring 15 inside the pressure pot 14 and radially outside of the annular piston 4th and piston housing 8th arranged. The two embodiments differ with regard to the arrangement of the hydraulic connection 24th : In the embodiment of the 3rd is the hydraulic connection 24th radial to the axis of the ring piston 4th arranged. In the embodiment of the 4th the hydraulic connection is axial to the axis of the ring piston 4th arranged.

In the embodiment of the 5 is the piston housing 8th formed as a sheet metal component. This has compared to the embodiments with a plastic piston housing 8th the advantage that space can be saved in the radial direction.

In the embodiment of the 6 is the preload spring 15 in the pressure chamber of the piston housing 8th arranged, radially outside of the annular piston 4th . This is with an annular groove 25th provided in the preload spring 15 is arranged and centered. The preload spring 15 is on the one hand on the ring piston 4th and on the other hand on the piston housing 8th supported and thereby transmits the necessary force to prevent slipping between the plate spring tongues and release bearing. For sealing between the ring piston 4th and the piston housing 8th are two groove sealing rings 26 installed.

Reference list

1

Release device

2nd

casing

3rd

Release bearing

4th

Piston, ring piston

5

opening

6

Sheet metal ring carrier

7

Storage section

8th

Piston housing

9

Housing inner wall

10th

Housing outer wall

11

Sheet metal ring

12th

Outer ring of the release bearing

13

Inner ring of the release bearing

14

Pressure pot

15

Preload spring

16

Outer ring of the support bearing

17th

Support bearing

18th

Inner ring of the support bearing

19th

gear shaft-proof component

20

Spacer ring

21st

gear shaft-proof component

22

Screw connection

23

Investment shoulder

24th

Hydraulic connection

25th

Ring groove

26

Grooved seal

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included 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.

Patent literature cited

• DE 102010051152 A1 [0003]

Claims (10)

Disengaging device (1) for a clutch of a motor vehicle, the disengaging device (1) having a housing (6, 8) in which at least one piston (4) operatively connected to a disengaging bearing (3) of the disengaging device (1) is accommodated by the release bearing (3) to actuate the clutch, the housing (6, 8) having a central opening (5) for receiving an input or output shaft therein, characterized in that the release device (1) has a support bearing (16, 17, 18), with which it can be supported radially and axially on the input or output shaft. Release device (1) according to Claim 1 , characterized in that the release bearing (3) is arranged radially outside the support bearing (16, 17, 18). Release device (1) according to Claim 1 or 2nd , characterized in that the release bearing (3) is arranged axially nested with the support bearing (16, 17, 18) in the unactuated state of the release device (1), or in that the release bearing (3) is axially axially connected with the release device (1) the support bearing (16, 17, 18) is arranged nested. Release device (1) according to one of the preceding claims, characterized in that the support bearing (16, 17, 18) is designed in the form of a shoulder roller bearing (17). Release device (1) according to one of the preceding claims, characterized in that the shaft accommodated in the central opening (5) of the housing (6, 8) is a gear shaft. Release device (1) according to one of the preceding claims, characterized in that it comprises a hydraulic connection (24) for hydraulic medium for actuating the piston (4) in the housing (6, 8), the hydraulic connection (24) in the radial direction on the housing ( 6, 8) is arranged or wherein the hydraulic connection (24) is arranged in the axial direction on the housing (6, 8). Release device (1) according to one of the preceding claims, characterized in that the piston (4) is arranged radially outside the release bearing (3) and / or the support bearing (16, 17, 18). Release device (1) according to one of the preceding claims, characterized in that the piston (4), the release bearing (3) and the support bearing (16, 17, 18) are arranged axially and in this order from radially inside to radially outside. Clutch for a motor vehicle with a release device (1) according to one of the preceding claims. Clutch after Claim 9 , characterized in that the support bearing (16, 17, 18) is arranged on a first component (19) fixed to the drive shaft or output shaft and is clamped in a manner defining an axial position to a second component (21) fixed to the drive shaft or output shaft by means of a spacer ring (20) .

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