WO2017186215A1

WO2017186215A1 - Slave cylinder for a clutch actuating unit

Info

Publication number: WO2017186215A1
Application number: PCT/DE2017/100298
Authority: WO
Inventors: Daniel Bosnjak
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2016-04-26
Filing date: 2017-04-12
Publication date: 2017-11-02
Also published as: DE102016207088A1; DE112017002176A5

Abstract

Slave cylinder for a clutch actuating unit, comprising a piston (3, 4) which is mounted axially movably in a housing (2) and acts on a release bearing (7, 8), wherein the release bearing (7, 8) is fixed on the piston (3, 4) by means of a radially extending securing ring (5, 6) which is configured as a transport securing means, wherein the securing ring (5, 6) has an inner edge which is fastened to an inner ring (14, 15) of the release bearing (7, 8), whereas an outer edge of the securing ring (5, 6) is fixed on the piston (3, 4). In the case of a slave cylinder, the installation space of which is reduced, hooks (20, 21, 22, 23) which point in the axial direction are configured on the outer edge of the securing ring (5, 6), wherein each hook (20, 21, 22, 23) is delimited by way of two windows (24, 25) which, starting from the outer edge, extend in the radial direction of the securing ring (5, 6).

Description

Slave cylinder for a clutch actuation unit

The invention relates to a slave cylinder for a clutch actuation unit, comprising a piston axially movably mounted in a housing, which acts on a release bearing, wherein the release bearing is fixed to the piston by means of a radially extending, designed as a transport securing ring, wherein the retaining ring has an inner edge which is fixed to an inner ring of the release bearing, while an outer edge of the retaining ring is fixed to the piston.

From WO 2015/131895 is a release system for a

Kupplungsbetätigungseinnchtung known which represents a slave cylinder, which is provided for actuating friction clutches, for example in a vehicle. The slave cylinder comprises a housing in which a piston is mounted axially movable in a pressure chamber defined by the housing. This

Slave cylinder is hydraulically operated and used to disengage friction clutches.

Furthermore, double clutches are known, which are constructed accordingly

Clutch actuators are operated with two pistons. Such

Actuators for double clutches are constructed accordingly complex and offer very little space for securing means against the

Losing or improper removal of the piston.

It is known to lose the piston against a release bearing of the

Slave cylinder when transporting the Kupplungsbetätigungseinnchtung by a transport lock to keep. Such a transport lock, which a

Circlip with snap hook represents, requires a large axial space. This is necessary because a large axial elasticity of the snap hook is necessary to be fixed to the piston.

The invention is therefore an object of the invention to provide a slave cylinder, in which the space of the transport lock in the radial and axial direction is limited, but still sufficient coverage of the transport lock with the engagement bearing and the piston is guaranteed. According to the invention the object is achieved in that on the outer edge of the retaining ring in the axial direction pointing hooks are formed, each hook is limited by two windows which extend from the outer edge in the radial direction of the retaining ring. Due to these windows extending in the circlip on both sides of the hook in the radial direction, radial softness of the hooks is achieved with minimum axial length. This leads to the fact that the space of the retaining ring can be reduced.

Advantageously, the windows of the retaining ring are formed as slots. Such slots can be easily produced and cause sufficient radial softness with a particularly short axial extent.

In order to further reduce the space in the radial direction, the hook terminates in the radial direction with the outer edge of the retaining ring.

In one embodiment, the piston has a radially outwardly directed collar, which is encompassed by the hook. By this configuration, the hook can be clipped around the collar, so that additional additional fasteners omitted, whereby the assembly costs are reduced.

In a variant, the hook is divided into three sections, the first section extending parallel to the circlip between the two windows, a second section bent by 90 ° in the axial direction to the first section and a third section abutting the second section 180 ° inwardly bent to the locking ring, wherein the third portion is biased against the collar of the piston. By this bias snaps the hook on the collar of the piston and realizes a particularly reliable attachment of the

Lock ring.

In a further development, the inner edge of the retaining ring comprises the inner ring of the release bearing U-shaped. This ensures a secure mounting on the release bearing.

In one embodiment, extending between the inner edge and the

Outer edge of the locking ring a center piece, which on the inner ring of the Release bearing and a front side of the piston rests. As a result, a particularly compact construction of the slave cylinder is achieved. An axial movement between the release bearing and the piston is hardly possible.

In a variant, the housing is cylindrical and the piston has a round cross-section. By this design, the piston and the housing can be particularly easy to form one another and require little space.

Advantageously, the cylindrical housing comprises a pressure chamber in which the piston is guided, wherein the piston is sealed by a sealing element against the pressure chamber. As a result, a particularly compact arrangement of the slave cylinder is achieved since, in slave cylinders, which are moved hydraulically, the hydraulic fluid is in the pressure chamber, which moves the piston. By the sealing element is a penetration of the hydraulic fluid into other parts of the slave cylinder and thus contamination of the

Slave cylinder prevents.

The invention allows numerous embodiments. One of them will be explained in more detail with reference to the figures shown in the drawing.

Show it:

1 shows an embodiment of the slave cylinder according to the invention,

2 shows an enlargement of the region X of the slave cylinder according to FIG. 1, FIG.

3 shows an exemplary embodiment of the retaining ring of the slave cylinder according to FIG. 1.

In Fig. 1, an embodiment of the slave cylinder according to the invention is shown, which is shown as a piston-cylinder assembly 1 in a partial sectional view. In this piston-cylinder assembly 1 is a double clutch, in which in a cylinder housing 2, a first piston 3 and a second piston 4 are arranged. The first piston 3 is connected to a first

Circlip 5 and the second piston 4 with a second locking ring 6 attached to the respective release bearings 7 and 8. Each piston 3, 4 is with a

Sealing element 9, 10 sealed against a formed by the cylinder housing 2 each pressure chamber 1 1, 12. In Fig. 2 is a region X between the release bearing 7, 8 and piston 3, 4th

arranged retaining rings 5, 6 shown in an enlargement. These securing rings 5, 6, which serve as transport securing devices, each represent a one-piece sheet-metal part which has a center piece 13 which extends radially between an inner ring 14, 15 of the release bearing 7, 8 and an end face 16, 17 of the respective piston 3, 4. Adjoining the center piece 13 as the first end of the inner edge of the locking ring 5, 6, which is bent in a U-shape and the inner ring 14, 15 of the release bearing 7, 8 encloses. The outer edge, which represents the second end of the securing ring 5, 6, has a plurality of snap hooks 20, 21, 22, 23. These snap hooks 20, 21, 22, 23 encompass a radial collar 18, 19 of the respective piston 3, 4.

In Fig. 3 different views and enlargements of the retaining ring 5 are shown. The circlip 6 is constructed identically, It is shown in Fig. 3a is a plan view of the retaining ring 5, which is bent at its inner edge U-shaped. At the outer edge of the transport securing forming

Circlip four snap hooks 20, 21, 22, 23 formed circumferentially distributed at equal intervals. These snap hooks 20, 21, 22, 23, which are shown in the magnifications Y and X, are from the outer edge of the

Circlip 5 formed. In this case, webs are in the unbent state beyond the securing ring 5 addition, wherein on both sides of the web depending on a window 24, 25 is incorporated radially into the securing ring 5, starting from the outer edge of the locking ring 5. These windows 24, 25 may simply be designed as a slot.

To produce the snap hook 20, 21, 22, 23, starting from the outer edge of the retaining ring 5, each web is subdivided into three sections, wherein a first section 26 extends between the two windows 24, 25 in a plane with the securing ring 5. The second section 27 is bent by 90 ° to the first section 26. The third portion 28 of each snap hook 20, 21, 22, 23, which connects directly to the second portion 27, is bent by 180 ° inwards to the retaining ring 5 and thus forms the complete snap hook 20, 21, 22, 23, which the collar 18 of the piston 3 engages under and is biased against this. Thus, a simple clip connection without additional Fastener manages achieved. At the same time, the radial softness of the snap hooks 20, 21, 22, 23 is increased by the introduction of the windows 24, 25.

LIST OF REFERENCES

Piston-cylinder arrangement

cylinder housing

piston

circlip

release bearing

sealing element

pressure chamber

centerpiece

Inner ring of the release bearing

Front side of the piston

collar

snap hooks

window

window First section of the snap hook Second section of the snap hook Third section of the snap hook

Claims

claims

1 . Slave cylinder for a clutch actuation unit, comprising a piston (3, 4) axially movably mounted in a housing (2), which acts on a release bearing (7, 8), the release bearing (7, 8) being attached to the piston (3, 4) by means of a radially extending, as a transport lock

formed locking ring (5, 6) is fixed, wherein the securing ring (5, 6) has an inner edge which on an inner ring (14, 15) of the

Release bearing (7, 8) is fixed, while an outer edge of the

Circlip (5, 6) is fixed to the piston (3, 4), characterized

in that hooks (20, 21, 22, 23) pointing in the axial direction are formed on the outer edge of the securing ring (5, 6), each hook (20, 21, 22, 23) being formed by two windows (24, 25). is limited, which is

extending from the outer edge in the radial direction of the locking ring (5, 6).

2. slave cylinder according to claim 1, characterized in that the windows (24, 25) of the securing ring (5, 6) are formed as slots.

3. slave cylinder according to claim 1 or 2, characterized in that the hook (20, 21, 22, 23) in the radial direction with the outer edge of the

Locking ring (5, 6) completes.

4. slave cylinder according to claim 1, 2 or 3, characterized in that the piston (3, 4) has a radially outwardly directed collar (18, 19) which is encompassed by the hook (20, 21, 22, 23) ,

5. slave cylinder according to at least one of the preceding claims,

characterized in that the hook (20, 21, 22, 23) is divided into three sections (26, 27, 28), the first section (26) being in a plane with the locking ring (5, 6) between the two Windows (24, 25) extends, a second portion (27) bent by 90 ° in the axial direction of the first portion (26) and a third on the second portion (27) abutting portion (28) by 180 ° inwardly to the retaining ring (5, 6) is bent, wherein the third portion (28) is biased against the collar (18, 19) of the piston (3, 4).

6. slave cylinder according to at least one of the preceding claims,

characterized in that the inner edge of the securing ring (5, 6) comprises the inner ring (14, 15) of the release bearing (7, 8) U-shaped.

7. slave cylinder according to at least one of the preceding claims,

characterized in that between the inner edge and the

Outer edge of the locking ring (5, 6) a central piece (13) which abuts against the inner ring (14, 15) of the release bearing (5, 6) and an end face (16, 17) of the piston (3, 4).

8. slave cylinder according to at least one of the preceding claims,

characterized in that the housing (2) is cylindrical and the piston (3, 4) has a round cross-section.

9. Slave cylinder according to claim 8, characterized in that the

cylindrical housing (2) comprises a pressure chamber (1 1, 12), in which the piston (3, 4) is guided, wherein the piston (3, 4) via a sealing element (9, 10) against the pressure chamber (1 1, 12) is sealed.