DE102008058699A1 - Clutch i.e. friction clutch, for hydraulic clutch actuator of motor vehicle, has bearing supporting torque support in tangential direction around axis of clutch, where torque support is supported in bearing in pre-tensioning manner - Google Patents

Abstract

The clutch (10) has a hydraulic release unit, which exhibits a slave cylinder (4) i.e. central ring shaped slave cylinder, with a torque support (21), which engages in a housing-fixed bearing (22). The bearing supports the torque support in tangential direction around a longitudinal axis (23) of the clutch against rotation around the longitudinal axis. The torque support is supported in the bearing in a pre-tensioning manner. The bearing is arranged at a clutch housing. A safety-stopper is arranged on a side of arms of a clip and a thin clip of the bearing.

Description

The The present invention relates to a coupling, in particular a Friction clutch for a drive train of a motor vehicle, with a hydraulic release button, a slave cylinder having a torque support, which in a housing fixed Bearing engages the torque support in tangential Direction about a longitudinal axis of the clutch against rotation stored around the longitudinal axis.

From the DE 101 38 722 A1 is a clutch-proof release for a friction clutch in a motor vehicle known. The actuating system for the clutch comprises a master cylinder, a pressure line and a slave cylinder, wherein a pressure built up in the master cylinder when the clutch pedal is depressed is passed via the pressure line through a hydraulic fluid to the slave cylinder.

It Central Slave Cylinders (CSC) are known, which carried out clutch-like as in the above-mentioned prior art can be, d. H. the support forces the slave cylinder are through the clutch housing, for example through the clutch cover, added. However, this support is usually such that the slave cylinder is still around the clutch axis can turn. To limit this possibility of movement, it is known, the slave cylinder fixed to the housing in the circumferential direction support. This is from the above application known. In this case, the nozzle for connecting the pressure line as Torque support used for the slave cylinder become. Such a torque support has, however, as disadvantageous, since the inclusion of the nozzle in one fixed to the housing during the life of the coupling had an increasing game. Likewise, resonances can occur.

A perfectly firm storage is also undesirable since the bearing for the torque support at a Blocking the degree of freedom of movement in the circumferential direction of a movement in the axial direction, d. H. in the direction of the longitudinal axis of Clutch, and in the radial direction should allow to pass through the Crankshaft caused vibration movements not with an additional constraint to act on.

A The object of the invention is known from the prior art To improve couplings, in particular a reliable and durable torque support of the releaser should be guaranteed.

The Task is solved by a coupling, in particular a Friction clutch for a drive train of a motor vehicle, with a hydraulic release button, a slave cylinder having a torque support, which in a housing fixed Bearing engages the torque support in tangential Direction about a longitudinal axis of the clutch against rotation stored around the longitudinal axis, the torque support is stored biased in the camp. The coupling is preferably Part of a drive train, in particular for a motor vehicle, with a rotationally connected to the drive unit Coupling, this means that a clutch housing the clutch with a drive unit of the motor vehicle rotationally connected is. The drive unit may be an internal combustion engine or an electric machine. The releaser is preferably a central release. The longitudinal axis of the coupling is preferably a longitudinal axis of a drive or a Output shaft of the clutch. The inventive Storage takes place in the circumferential direction to the longitudinal axis, d. H. tangential, wherein the torque support in the Bearings tangentially clamped or biased. This means that the torque support through the bearing in tangential Direction from both sides with a compressive force or both Each side is subjected to a tensile force, the respective pressure forces or the respective tensile forces a resetting Apply force to the torque support, if this is moved out of a rest position. Such a move out For example, by a dynamic during operation of the releaser occur. In addition, a move out caused by the rest position of the torque support thereby be that the bearing of the releaser is not complete is frictionless, so that, for example, a rotational movement of a Wave, on which the release is stored, to a deflecting moment for the releaser about the longitudinal axis leads, so that the torque support from their Resting position moves. The invention offers the advantage that a permanent Guaranteed storage of torque support and at the same time force peaks are mitigated, so it there is no or only very little wear. In addition, the invention offers the advantage that the torque support can be dimensioned smaller, since the forces occurring are lower. In the context of the invention, preference is given to that of the two Sides a compressive force on the torque support in tangential direction around the longitudinal axis of the coupling becomes.

Preferably, the bearing is arranged in a coupling housing of the coupling. For this purpose, it is possible, for example, to arrange the bearing on a cover of the coupling. It is also possible to move the bearing to another location on the Kupplungsge to arrange housing. In addition, it is also possible to arrange the bearing firmly on an adjacent wall of a transmission housing. It is generally preferred that the bearing is mounted fixed to the housing.

Advantageously, the releaser is a housing-fixed release. This is on the DE 101 38 722 A1 directed. A housing-mounted release mechanism has the advantage that forces on the crankshaft and in particular forces on thrust bearings of the crankshaft are avoided. In connection with the invention, a housing-fixed releaser offers the advantage that the forces arising during operation of the releaser can be largely absorbed within the coupling.

Preferably is the torque support in the bearing in the axial direction or in the radial direction with respect to the longitudinal axis of the Clutch displaceable. This offers the advantage that the torque support absorb no forces in the axial or radial direction got to. Furthermore, this is another existing storage of Releaser not affected.

advantageously, is the surface in contact with the bearing Torque support or with the torque support In contact surface of the bearing friction, so that the torque support in the bearing in axial Direction or radial direction with respect to the longitudinal axis the clutch is slidably mounted. This is a way to implement the aforementioned slidable storage. This means Sliding storage that the warehouse in operation a slidability having such a possibility of shifting the torque support in the bearing of course can be fraught with friction. This is due to the fact that a completely frictionless storage in practice not is to implement. Examples of low-friction surfaces are surfaces made of plastic, steel, other metals, Lubricating varnish or comparable means are formed, in particular it is preferred that the two mentioned surfaces, which are in contact with each other, are mutually frictionless. Examples include plastic on steel, possibly coated with a lubricating varnish or steel on steel, in turn may be lubricated. To be favoured Wear-resistant surfaces such as steel or other Metals.

Preferably indicates the bearing in the direction of the prestressed bearing, d. H. in the direction of the bias, at least one spring-damper element on. An example of such a spring-damper element is an elastomer, but it can also be other plastics or other known spring-damper materials or combinations be used. Preferably, the spring-damper elements arranged in a receptacle showing the two spring-damper elements each supported in the tangential direction, wherein the torque support clamped between the two spring-damper elements is that the bias to storage arises. By the damping The spring-damper elements can be avoided that there are resonant vibrations within the bearing. Therefore, will generally preferred that in addition to the preload in the bearing as well a damping is provided. It is preferred that on the spring-damper elements each the low-friction surfaces are arranged.

Preferably includes the bearing for preloaded bearing of the torque support a bracket with two arms, with the torque support is arranged between the two arms. Preferably, the Arms themselves elastic or as an abutment for the bias suitable. Additionally, within the bracket Be arranged elements that apply the bias, if between them the torque support is clamped, for example two elastomers. In addition, other spring-damper elements are possible. Another possibility is that the arms of the bracket even have a rigidity, so that when arranging the torque support bent between them be, while the bias voltage is generated. The take Arms of the clamp preferably as Kragträger the force the bias on.

A further advantageous possibility, with the above It can be combined with the clip on at least one other Support point against the force of the bias, for example, at a respective end of the two arms. This offers the advantage of making the clamps lighter can, as they do not serve as cantilever the bearing forces but as a bending beam.

advantageously, is on the torque arm repellent side of the Arms of the bracket each arranged a safety stop. This offers the advantage that the arms each have a low spring stiffness which is adapted to normal operation. If there is an overload in the torque support occurs, which is not expected in normal operation, suggests the torque support with the respective arm of the bracket at the security stop. This is acceptable insofar as this rarely happens, so a wear problem is not expected.

Advantageously, the clip has an insertion aid for the torque support. Generally, the bearing preferably has an introducer help for the torque support on. Such an import aid may include import bevels, which are attached, for example, on the staple arm, preferably two entry bevels are formed on two clip arms. Another possibility is to continue the low-friction surface in an import slope. This offers the advantage of a particularly simple and safe installation of the coupling.

in the Below, embodiments of the invention are based on of the accompanying drawings. Showing:

1 a schematic representation of an example of a hydraulic power transmission system in which a coupling according to the invention can be used;

2 schematically a detail of the hydraulic power transmission system of 1 with a torque support according to the invention in a different perspective;

3 schematically a possible embodiment of a bearing according to the invention in a cross-sectional view;

4 schematically another possible embodiment of a bearing according to the invention in a cross-sectional view; and

5 schematically another variant of a torque support according to the invention in a sectional view.

In the 1 an example of a hydraulic power transmission system is shown, in which a coupling according to the invention is used. The hydraulic power transmission system is a hydraulic clutch actuator 1 for a motor vehicle. The clutch operation 1 includes a master cylinder 2 by a hydraulic pressure line 3 with a slave cylinder 4 is in fluid communication. The slave cylinder 4 is designed as a central annular slave cylinder (CSC). In an annular slave cylinder housing 5 is an annular slave cylinder piston 6 stored. The annular slave cylinder 4 and the annular slave cylinder piston 6 close a turn annular pressure chamber 7 one. The slave cylinder 4 is about a release bearing 8th stored and operated a disc spring 9 , The plate spring 9 serves to actuate a clutch 10 ,

This clutch 10 includes next to the slave cylinder 4 , the slave cylinder housing 5 , the slave cylinder piston 6 , the pressure room 7 , the release bearing 8th and the plate spring 9 another printing plate 11 , a counter pressure plate 12 and a clutch disc 13 , The plate spring 9 is biased so that these in biasing the pressure plate 11 on the counter pressure plate 12 presses while the non-rotatably connected to a transmission input shaft clutch disc 13 between the pressure plate 11 and the counterpressure plate 12 clamps. These are the pressure plate 11 and the counterpressure plate 12 rotatably ver with a crankshaft of an internal combustion engine, not shown here as a drive unit of a motor vehicle a related party. When pressurizing the slave cylinder 4 is therefore the diaphragm spring 9 moved so that they counter to their biasing direction, the contact pressure of the printing plate 11 in the direction of the pressure plate 12 reduces and thus a frictional connection between the clutch disc 13 on the one hand and the pressure plate 11 and the counterpressure plate 12 on the other hand solves

The master cylinder 2 of the 1 includes a master cylinder piston 14 that by means of a clutch pedal 15 over a push rod 16 is pressed. A master cylinder housing 17 of the master cylinder 2 and the master cylinder piston arranged movably therein 14 close a pressure chamber 18 one. In pressureless systems is with the pressure chamber 18 a back-up tank 19 hydraulically connected. One in the pressure line 3 arranged hydraulic valve 20 serves to quick return movements of the clutch pedal 15 in their effect on the hydraulic clutch actuation 1 to limit. As a result, high Einkuppelgeschwindigkeiten when operating the clutch 10 avoided.

According to the invention, the hydraulic clutch actuation 1 with the clutch 10 now extended so that the slave cylinder 4 , ie the central release, with a torque support 21 which is added to a warehouse 22 intervenes. Like all other parts of the hydraulic clutch control 1 also are the torque support 21 and the camp 22 shown here only very schematically. The warehouse 22 serves to the torque support 21 biased in a tangential direction about a longitudinal axis 23 the clutch 10 stored biased. The preloaded bearing of the torque support 21 in the warehouse 22 is explained in more detail below in connection with the further figures, wherein various embodiments of inventive bearing 22 and torque supports 21 to be shown.

In the 2 a part of a clutch operation is shown, in which the invention can be implemented. In connection with the description of the 2 the same reference numerals for the same parts as in the 1 used. The pressure line can be seen 3 over which the slave cylinder 4 is hydraulically controlled. Furthermore, the torque support 21 shown, which is connected to the slave cylinder housing. The Torque support is designed such that it in the in the 3 closer explained bearing 22 is insertable.

In the 3 is a possible embodiment of a bearing according to the invention 22 again shown, wherein like reference numerals for the same or similar parts as in the 1 and 2 be used. The warehouse 22 includes a bracket 25 , which has a relatively large sheet thickness, so that the two side arms of the clip 25 at a load by the torque support 21 only slightly or substantially not yield. The 3 makes a tangential cut through the bearing 22 and the torque support 21 , wherein the relevant parts are shown schematically. Tangential refers in this case again to the longitudinal axis 23 ( 1 ) of the clutch 10 , In the clip 25 is the torque support 21 mounted clamped or prestressed, wherein the bias voltage is achieved in that between the arms of the clamp 25 and the torque support 21 two elastomer blocks 26 are arranged. Furthermore, this has in the 3 illustrated bearings 22 over two sliding plates 27 , which on the one hand a low-friction surface for the torque support 21 represent and continue from the clip 25 are funnel-shaped bent, so an introduction of the torque support 21 in the warehouse 22 is relieved.

The one in the camp 22 remaining space, which through the two elastomer blocks 26 and the two sliding plates 27 is limited, is such that the torque support 21 backlash-free and loaded in the tangential direction by a bias in the camp 22 is recorded. The bias is through the two elastomer blocks 26 maintained. The elastomer blocks act as a spring-damper element. This storage has the advantage that the torque support in the tangential direction backlash and elastically supported and by the elastomer blocks 26 is also kept damp, so that a rotation of the slave cylinder housing 5 ( 1 ) Reliable and largely wear is prevented. On the other hand, the torque support 21 in radial, ie perpendicular to the image plane of the 3 , and in the axial direction (in the 3 in the image plane up and down) relatively freely movable or friction sliding, so no additional constraints constrained for the storage of the slave cylinder 4 or the slave cylinder housing 5 ( 1 ) through the warehouse 22 be created. For the sake of completeness, there are two more screws 28 mentioned, with which the bracket 25 or the camp 22 is fixedly mounted on a transmission housing or other housing. In the described and shown embodiment of the invention so take the arms of the clip 25 as Kragträger the force of the bias on. It is generally preferred in the context of the invention for an elastomer to be used in the pretensioning direction, as here the elastomer blocks 26 , is arranged in the power flow and acts damping.

In the 4 is another inventive bearing 22 shown, which is executed differently than that in the 3 shown bearings 22 , Again, the description of the 1 With reference to the same reference numerals designate like or similar parts. The warehouse 22 of the 4 includes a thin clip 30 which alone would not be sufficiently stable to accommodate the bearing forces. The drawing cuts the camp 22 again tangential, so that the direction of the bias and the direction of the support in the 3 not shown torque absorption 21 lies in the picture plane. The thin clip 30 also has arms with chamfers, which is an introduction of the torque support 21 (in the 4 not shown). Because the thin clip 30 alone would not be enough to the forces from the torque support 21 she is in a recording block 31 recorded, which is sufficiently stable to the bracket 30 at two other points of support 32 at the recording block 31 support. The recording block 31 continues to have two holes 33 , with which it can be fixed to a gear housing or other housing fixed to the housing.

The brackets 30 can elastically absorb normal forces occurring during normal operation without leaving the receiving block 31 to come across. In case of any overload, the corresponding arm of the clip would 30 against the recording block 31 so that appropriate overload protection is ensured. In the gap between the bracket 30 and the recording block 31 in the area of the receptacle for the torque support 21 Damping materials can be arranged. This gap is in the 4 with the reference number 34 characterized. Such materials may be, for example, elastomers or other plastics which have a damping effect. Otherwise, the clip 30 so dimensioned that when introducing the torque support 21 already an elastic tension is built up, so that the torque support 21 free of play in a press fit with preload in the tangential direction in the clamp 30 is recorded. The clip 30 is coated with a lubricating varnish, allowing movements of the torque support 21 in the radial and axial direction, ie in the 4 perpendicular to the drawing plane and in the drawing plane up and down, are easily possible.

In the 5 is another variant of a torque support according to the invention 21 ge shows, this torque support 21 intended to be in the warehouse 22 of the 4 to be included. The torque support 21 includes an arm 40 , the Indian 5 is shown schematically cut. On the arm 40 are on both sides in the tangential direction, ie in the direction of the bias, two sliding shoes 41 arranged, which are constructed of a damping material, preferably an elastomer, and on their surfaces, which with the bearing 22 come in contact, a lubricious coating 42 exhibit. The sliding shoes 41 act as a spring-damper element when executed in an elastomeric material. When recording the torque support 21 of the 5 in the warehouse 22 of the 4 become the sliding shoes 41 in the bracket 30 of the 4 pushed in, with the sliding shoes 41 be squeezed and the clip 30 is slightly spread, so that a bias is built up in the tangential direction.

In addition to the illustrated variants of bearings 22 and torque supports 21 Further variants are conceivable, with variants according to the invention preferably receiving the torque support 21 in a warehouse 22 so that takes place in the tangential direction with respect to the longitudinal axis of the clutch 10 a bias voltage is built up and the bearing preferably has only a low resistance in the other directions, so that the bearing in these other directions is substantially displaceable.

1

clutch Control

2

Master cylinder

3

pressure line

4

slave cylinder

5

Slave cylinder housing

6

Slave cylinder piston

7

pressure chamber

8th

release bearing

9

Belleville spring

10

clutch

11

printing plate

12

Platen

13

clutch disc

14

Master cylinder piston

15

clutch pedal

16

pushrod

17

Master cylinder housing

18

pressure chamber

19

An expansion reservoir

20

hydraulic Valve

21

torque support

22

camp

23

longitudinal axis

25

clip

26

Elastomer blocks

27

sliding plates

28

screw

30

thin clip

31

receiving block

32

support point

33

drilling

34

Gaps

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10138722 A1 [0002, 0008]

Claims (11)

Clutch ( 10 ), in particular a friction clutch ( 10 ) for a drive train of a motor vehicle, with a hydraulic release device, a slave cylinder ( 4 ) with a torque support ( 21 ), which in a fixed housing ( 22 ) engages the torque support ( 21 ) in a tangential direction about a longitudinal axis ( 23 ) of the coupling ( 10 ) against rotation about the longitudinal axis ( 23 ), characterized in that the torque support ( 21 ) in the warehouse ( 22 ) is biased. Clutch ( 10 ) according to claim 1, characterized in that the bearing ( 22 ) on a clutch housing of the clutch ( 10 ) is arranged. Clutch ( 10 ) according to claim 1 or 2, characterized in that the releaser is a housing-fixed releaser. Clutch ( 10 ) according to one of the preceding claims, characterized in that the torque support ( 21 ) in the bearing in the axial direction and / or radial direction with respect to the longitudinal axis of the coupling ( 10 ) is slidably mounted. Clutch ( 10 ) according to claim 4, characterized in that the bearing ( 22 ) in contact surface of the torque support ( 21 ) and / or with the torque support ( 21 ) in contact surface of the bearing ( 22 ) are low in friction, so that the torque support ( 21 ) in the warehouse ( 22 ) in the axial direction and / or radial direction with respect to the longitudinal axis (FIG. 23 ) of the coupling ( 10 ) is slidably mounted. Clutch ( 10 ) according to one of the preceding claims, characterized in that the bearing ( 22 ) has a spring-damper element in the direction of the prestressed bearing. Clutch ( 10 ) according to one of the preceding claims, characterized in that the bearing ( 22 ) for preloaded bearing of the torque support ( 21 ) a bracket ( 25 . 30 ) with two elastic arms, wherein the torque support ( 21 ) is arranged between the two arms. Clutch ( 10 ) according to claim 7, characterized in that the arms of the clip ( 25 ) as a cantilever take the force of the bias. Clutch ( 10 ) according to claim 7, characterized in that the arms of the clip ( 30 ) at least one further point of support ( 32 ) are supported against the force of the bias voltage. Clutch ( 10 ) according to one of claims 7 to 9, characterized in that on the torque arm ( 21 ) repellent side of the arms in each case a safety stop is arranged. Clutch ( 10 ) according to one of claims 6 to 10, characterized in that the clip has an insertion aid for the torque support.