DE102015202324A1 - Actuation system for opening and / or closing a clutch of a motor vehicle - Google Patents

Abstract

It is an actuating system for opening and / or closing a clutch, in particular for coupling a drive shaft of a motor vehicle engine with at least one transmission input shaft of a motor vehicle transmission provided with a slave cylinder for disengaging and / or engaging a vulnerable to the clutch actuating piston, coupled to the actuating piston actuator bearing for moving a rotatable relative to the slave cylinder actuator for actuating the clutch and a piston associated with the first bearing ring of the actuating bearing and acting on the slave cylinder coil spring for removing drag torque of the first bearing ring to the slave cylinder, wherein the slave cylinder has an abutment on an axial side of the coil spring end stop , By striking the coil spring with its axial side on the end stop of the slave cylinder introduced via the actuating bearing drag moments can be removed past the actuating piston, whereby unnecessary ease of use of the actuating piston in the slave cylinder can be avoided with a simple mountability of attachment of the coil spring with the slave cylinder so that a low-wear and easy mountable actuation system for a friction clutch of a motor vehicle is made possible.

Description

The invention relates to an actuating system for opening and / or closing a clutch, in particular for coupling a drive shaft of a motor vehicle engine with at least one transmission input shaft of a motor vehicle transmission of a motor vehicle, with the help of which in particular hydraulically or pneumatically an actuating piston can be disengaged and / or engaged to the clutch actuate.

Out DE 10 2013 213 384 A1 an actuating system for a friction clutch of a motor vehicle is known, in which a slave cylinder which can be acted upon by a pressure for disengaging an actuating piston is provided. With the slave cylinder and the actuating piston, a spiral spring is connected to move the actuating piston in a defined starting position. With the actuating piston an actuating bearing is connected, which engages a co-rotating configured as a plate spring actuator for actuating the friction clutch.

There is a constant need to design an actuating system for a friction clutch wear and easy to install.

It is the object of the invention to show measures that allow a low-wear and easy mountable actuation system for a friction clutch of a motor vehicle.

The object is achieved by an actuating system having the features of claim 1. Preferred embodiments of the invention are set forth in the subclaims, which individually or in combination may constitute an aspect of the invention.

According to the invention, an actuating system for opening and / or closing a clutch, in particular for coupling a drive shaft of a motor vehicle engine with at least one transmission input shaft of a motor vehicle transmission is provided with a slave cylinder for disengaging and / or engaging an engageable on the clutch actuating piston, coupled to the actuating piston actuating bearing for moving a relative to the slave cylinder rotatable actuating element for actuating the clutch and a piston associated with the first bearing ring of the actuating bearing and acting on the slave cylinder coil spring for removing drag torque of the first bearing ring to the slave cylinder, wherein the slave cylinder has a stopperable on an axial side of the coil spring end stop ,

For example, in the slave cylinder hydraulic or pneumatic pressure can be applied to disengage the actuating piston against the spring force acting as a preload spring coil spring. When the pressure in the slave cylinder subsides, the spiral spring can move the actuating bearing and thus the actuating piston back into a defined starting position. The actuating piston can act on the actuator via the actuating bearing. The actuating element is designed in particular in the manner of a plate spring, so that the actuating bearing can engage a radially inner end of the actuating element and the actuating element can pivot by a change in the taper of the actuating element about a pivot point extending in the circumferential direction. Due to the pivoting movement of the actuating element, the actuating element can displace a pressure plate of a friction clutch axially to frictionally press a clutch disk between the pressure plate and a counterplate and thereby close the friction clutch and / or open the friction clutch. The actuating element can co-rotate with the rotational speed of the pressure plate and the counter plate of the friction clutch, so that the actuating element, in particular when closing the friction clutch, can act on the actuating bearing with a correspondingly high load. As a result, correspondingly high drag torques can occur in the actuating bearing. As a result of Schleppmoments the first bearing ring and also acting on the first bearing ring and guided in the slave cylinder actuating piston could rotate a little, whereby the actuating piston wear and could ease the sealing effect of the actuating piston in the slave cylinder.

Since the spiral spring acting on the slave cylinder is not connected to the actuating piston but to the first bearing ring, it is possible, however, to remove a drag torque arriving at the first bearing ring via the spiral spring on the actuating piston. Unnecessary loads of the actuating piston, which can lead to a tilting of the actuating piston in the slave cylinder or to unnecessary wear-prone relative movements can be avoided. The coil spring may, for example, be frictionally secured to the slave cylinder, for example by a clamping connection, so that the usually low occurring drag torques can be easily removed. For larger drag torques, in which a frictional engagement of the coil spring can be overcome with the slave cylinder, the direction away from the first bearing ring axial side of the coil spring at the end stop, which projects in particular in the radial direction of the slave cylinder strike. This can also be a larger Drag torque can be removed via a positive connection of the coil spring with the slave cylinder. It is also possible in the new state of the actuation system to design the distance of the end stop pointing axial side of the coil spring minimal or to bring the axial side of the coil spring in direct contact with the end stop, so that the end stop in addition to the defined positioning of the coil spring in the axial direction relative to the slave cylinder the assembly can be used. A separate alignment of the coil spring relative to the slave cylinder can be omitted, whereby the assembly is facilitated.

The power flow in the removal of drag torque introduced into the actuation bearing can extend from the first bearing ring over the spiral course of the spiral spring along the spiral longitudinal extent of a spring wire of the spiral spring to the end stop. The coil spring can be stressed in this case torsion, wherein prevail within the cross section of the spring wire substantially compressive forces in the longitudinal direction. In this case, the knowledge is exploited that relevant drag torques essentially occur only during traction when a torque flow from the motor vehicle engine to the motor vehicle transmission takes place, so that a one-sided striking is sufficient to remove the drag torques occurring in the actuating bearing safely. A complicated fixation of the coil spring with the slave cylinder, which can complicate the assembly is thereby avoided. In addition, thereby the actuating bearing is connected by means of the coil spring with the slave cylinder, so that a disintegration of the actuating system can be avoided during transport before mounting with a clutch. In particular, the actuating piston can be retained in the slave cylinder in a captive manner by the actuating bearing connected to the slave cylinder via the spiral spring. The coil spring can thereby fulfill not only the function of a preload spring and the function of removing drag torque of the actuating bearing, but also the function of a transport lock. By striking the coil spring with its axial side on the end stop of the slave cylinder introduced via the actuating bearing drag moments can be removed past the actuating piston, whereby unnecessary ease of use of the actuating piston in the slave cylinder can be avoided with a simple mountability of attachment of the coil spring with the slave cylinder so that a low-wear and easy mountable actuation system for a friction clutch of a motor vehicle is made possible.

The slave cylinder may in particular have an annularly closed cylinder chamber for receiving the actuating piston, which is arranged substantially concentric to a rotational axis of the clutch, so that the slave cylinder can be designed as a CSC ("concentric slave cylinder"). In particular, the actuating system is configured to actuate a double clutch and in particular has two nested piston-cylinder units to actuate a first clutch or a second clutch, such as in EP 1 524 446 A1 described, the contents of which are hereby incorporated by reference as part of the invention. The actuating bearing is designed in particular as a rolling bearing, in which an outer ring via rolling elements, in particular bearing balls, is rotatably supported relative to an inner ring. In particular, the first bearing ring is the inner ring, while the outer ring can engage the actuating element. In particular, the bearing on the actuating element bearing ring is rotatably connected to the actuating element.

In particular, the slave cylinder has a first hold-down device for limiting the axial relative position of the spiral spring in a first axial direction and / or a second hold-down device for limiting the axial relative position of the spiral spring in a second axial direction opposite to the first axial direction. By the respective hold-down a kinking of the coil spring can be avoided when removing drag torque. In addition, it is possible to clamp the spiral spring between the first hold-down device and the second hold-down device and thereby already bring about a frictional connection of the spiral spring with the slave cylinder. In addition, the coil spring can be positioned in the axial direction in a defined relative position to the slave cylinder on the slave cylinder. During assembly, only one turn of the coil spring, in particular a first end piece of the spiral spring pointing towards the end stop, needs to be inserted between the hold-downs, so that the spiral spring can be correspondingly easily connected to the slave cylinder during assembly.

The slave cylinder preferably has a holding element for limiting a radial spacing of the spiral spring from the slave cylinder. A radial unwinding of the coil spring of the slave cylinder, especially when removing drag torque can be avoided. The coil spring can thereby be retained to a certain maximum diameter. In particular, the coil spring can be clamped between the holding element and the slave cylinder, so that the coil spring, especially in the unloaded state, can press against the holding element away from the slave cylinder with a holding force. The holding element in particular forms a substantially U-shaped undercut, in which the coil spring can be inserted. The undercut is designed in particular open in one of the axial directions, from which a part of the coil spring can be inserted into the undercut.

Particularly preferably, the holding member is spaced adjacent to the end stop such that a extending from the holding element in the circumferential direction to the end stop first end of the coil spring is forced into a Zwangsrelativlage to the end stop, wherein the axial side of the first end piece of the coil spring points to the end stop. As a result, the axial side in the removal of drag torque under load can not be pressed past the end stop in the radial direction. Instead, the axial stop, in particular, strike the end stop substantially flat and remove the drag torques at the end stop. In addition, the radial extent of the end stop can be kept correspondingly low, so that only correspondingly little radial space is needed. Preferably, the radial extension of the end stop substantially corresponds to the diameter of the spring wire of the spiral spring or is up to 30%, preferably up to 20% and more preferably up to 10% larger than the diameter of the spring wire.

In particular, a distance Δα of the retaining element to the end stop in the circumferential direction is 2 ° ≦ Δα ≦ 20 °, in particular 4 ° ≦ Δα ≦ 15 °, preferably 6 ° ≦ Δα ≦ 10 ° and particularly preferably Δα = 8 ° ± 1 °. With such a selected distance of the retaining element to the end stop can be avoided that the axial side is not pressed at the end stop in the radial direction in the removal of drag torque under load.

Preferably, the slave cylinder has a protruding in the radial direction of the pretensioner lift for biasing the coil spring in the radial direction. The coil spring can be pushed away in particular in the radial direction by the preload lift, so that the coil spring can press against the preload lift with a holding force. In particular, the coil spring can be firmly clamped by means of the pretensioning and the holding element, so that a frictional attachment of the spiral spring can be given to the slave cylinder.

Particularly preferably, the spiral spring surrounds the slave cylinder radially outside, wherein the coil spring is arranged to a large extent substantially concentric with the slave cylinder. The coil spring can thereby be easily pushed during assembly on the slave cylinder and secured by radially outward with the slave cylinder.

In particular, the spiral spring via a second end piece, in particular by frictional engagement and / or positive engagement, immovably connected to the first bearing ring. As a result, an incoming relative movement of the actually stationary first bearing ring can be intercepted immediately by the coil spring and the corresponding drag torque can be removed. A relative rotation of the first bearing ring to the second end piece and an associated relative rotation of the actuating piston in the slave cylinder can be avoided or at least minimized.

The invention further relates to a clutch assembly for coupling a drive shaft of an automotive engine with at least one transmission input shaft of a motor vehicle transmission, with a friction clutch for frictional coupling of the drive shaft with the at least one transmission input shaft, designed as a disc spring actuator for opening and / or closing the friction clutch and a Actuating system, which may be formed and further developed as described above, for displacing the actuating element. By abutting the coil spring of the actuating element with its axial side to the end stop of the slave cylinder introduced via the actuating bearing drag moments can be removed past the actuating piston, thereby avoiding easy mounting of the attachment of the coil spring with the slave cylinder unnecessary wear of the actuating piston in the slave cylinder can, so that a low-wear and easy mountable clutch unit for a friction clutch of a motor vehicle is possible.

The invention will now be described by way of example with reference to the accompanying drawings with reference to preferred embodiments, wherein the features shown below, both individually and in combination may represent an aspect of the invention. Show it:

1 FIG. 2: a schematic side view of an actuating system during assembly, FIG.

2 a schematic sectional view of the actuation system 1 along a section line AA,

3 a schematic side view of the actuation system 1 after assembly and

4 a schematic sectional view of the actuation system 3 along a section line AA.

This in 1 partially illustrated actuating system 10 has a slave cylinder 12 on top of which is a spiral spring 14 is deferred. Part of the coil spring 14 is in the axial direction between a clutch side first hold-down 16 and one to the first hold down 16 offset in the circumferential direction and in the axial direction of the transmission side second hold-down 18 Guided along, with the coil spring 14 optionally with in each case a pointing in the axial direction holding force on the first hold-down 16 and at the second hold-down 18 is applied.

As in 2 shown is the coil spring 14 not yet with the slave cylinder 12 firmly connected but at best with a low frictional force on the downers 16 . 18 recorded. A first tail 20 with an axial side 22 is from the slave cylinder 12 from. An unillustrated from the first tail 20 pointing away second end piece is connected to a first bearing ring of an actuating bearing, so that in the in 1 and 2 illustrated transport position of the actuating system in an annular space 24 recorded actuating piston between the actuating bearing and the slave cylinder 12 is taken captive. At the same time the actuating bearing via the coil spring on the slave cylinder 12 recorded.

When mounting the actuation system 10 in a clutch unit is the coil spring 14 firmly with the slave cylinder 12 attached. For this purpose, as in 3 and 4 represented the first tail 20 in the radial direction between the slave cylinder 12 and a holding element 26 in one of the holding element 26 and the slave cylinder 12 Trained trained U-shaped bag. To increase the on the holding element 26 adjacent clamping force, the coil spring runs over a radially outward of the slave cylinder 12 protruding pretensioning 28 , The axial side 22 of the first tail 20 has in the mounted state on a radially outward of the slave cylinder 12 protruding end stop 30 to. If sufficiently high drag torques in the spiral spring via the actuating bearing 14 can be initiated, the axial side 22 at the end stop 30 strike and these drag moments on the slave cylinder 12 of the actuation system 10 erode.

LIST OF REFERENCE NUMBERS

10

 actuating system

12

 slave cylinder

14

 spiral spring

16

 first hold-down

18

 second hold-down

20

 first tail

22

 axial

24

 annulus

26

 retaining element

28

 biasing survey

30

 end stop

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

• DE 102013213384 A1 [0002]
• EP 1524446 A1 [0010]

Claims (9)

Actuation system for opening and / or closing a clutch, in particular for coupling a drive shaft of a motor vehicle engine with at least one transmission input shaft of a motor vehicle transmission, with a slave cylinder (US Pat. 12 ) for disengaging and / or engaging an activatable on the clutch actuating piston, coupled to the actuating piston actuating bearing for displacing a relative to the slave cylinder ( 12 ) rotatable actuating element for actuating the clutch and on a the actuating piston associated with the first bearing ring of the actuating bearing and on the slave cylinder ( 12 ) attacking coil spring ( 14 ) for the removal of drag torques of the first bearing ring ring to the slave cylinder ( 12 ), wherein the slave cylinder ( 12 ) one on an axial side ( 22 ) of the spiral spring ( 14 ) stop limit stop ( 30 ) having. Actuating system according to claim 1, characterized in that the slave cylinder ( 12 ) a first hold-down ( 16 ) for limiting the axial relative position of the spiral spring ( 14 ) in a first axial direction and / or a second hold-down ( 18 ) for limiting the axial relative position of the spiral spring ( 14 ) in a second axial direction opposite to the first axial direction. Actuating system according to claim 1 or 2, characterized in that the slave cylinder ( 12 ) a holding element ( 26 ) for limiting a radial distance of the spiral spring ( 14 ) from the slave cylinder ( 12 ) having. Actuating system according to claim 3, characterized in that the holding element ( 26 ) so adjacent to the end stop ( 30 ) is spaced apart, that one of the retaining element ( 26 ) in the circumferential direction to the end stop ( 30 ) extending first end piece ( 20 ) of the spiral spring ( 14 ) in a forced relative position to the end stop ( 30 ), whereby the axial side ( 22 ) of the first end piece ( 20 ) of the spiral spring ( 14 ) on the end stop ( 30 ) to assign. Actuating system according to claim 3 or 4, characterized in that a distance Δα of the retaining element ( 26 ) to the end stop ( 30 ) in the circumferential direction 2 ° ≤ Δα ≤ 20 °, in particular 4 ° ≤ Δα ≤ 15 °, preferably 6 ° ≤ Δα ≤ 10 ° and particularly preferably Δα = 8 ° ± 1 °. Actuating system according to one of claims 1 to 5, characterized in that the slave cylinder ( 12 ) a protruding in the radial direction pretensioning ( 28 ) for biasing the coil spring ( 14 ) in the radial direction. Actuating system according to one of claims 1 to 6, characterized in that the spiral spring ( 14 ) the slave cylinder ( 12 ) radially outwardly surrounding, wherein the spiral spring ( 14 ) to a large extent essentially concentric with the slave cylinder ( 12 ) is arranged. Actuating system according to one of claims 1 to 7, characterized in that the spiral spring ( 14 ) via a second end piece, in particular by frictional engagement and / or positive engagement, immovably connected to the first bearing ring. Clutch assembly for coupling a drive shaft of a motor vehicle engine with at least one transmission input shaft of a motor vehicle transmission, with a friction clutch for frictionally coupling the drive shaft with the at least one transmission input shaft, an especially designed as a plate spring actuator for opening and / or closing the friction clutch and an actuating system ( 10 ) according to one of claims 1 to 8 for displacing the actuating element.

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