KR20010079545A - Seal for the hydraulically actuated release system - Google Patents

Abstract

The hydraulically actuated release system, in particular for automotive spring cuppling, has an internal guide having an annular cylindrical housing 2 and a central pressure chamber 4. A piston cylinder unit (1) encompassing a tube (guide tube) and the like is included, and at the same time, an axially movable piston (5) is housed in the pressure chamber. At the front end 6 of the piston are located sealing lips 9, 10 adjacent to the inside of the outer element 2 and to the outside 8 of the guide tube 3 and the like. In order to avoid operating defects arising from the blocking or sticking of the sealing element 6, the seal 6 is retained on the piston 5 so as to be fixed to the piston 5. and a positive fit with the retaining ring, the end section 12 of the piston 5 and the like.

Description

Seal for the hydraulically actuated release system

DE 196 35 101 A1 describes a hydraulically actuated release bearing for diaphragm spring clutches for motor vehicles. In the case of the bearing, a lip seal is connected to the piston by a connecting part. The connection is then fixed or contained in the lip seal, and at the same time an arm of the connection extending axially is inserted into the outer peripheral area of the piston.

In the case of the above-mentioned release bearings, the seal body may be undesirably blocked or stuck, thereby damaging the guide quality of the piston.

The present invention relates to a release return system for switching separation coupling, which is hydraulically operated, in particular characterized by the introduction clause of claim 1.

DESCRIPTION OF THE PREFERRED EMBODIMENTS For the detailed description of the present invention, preferred embodiments are described below in conjunction with the accompanying drawings.

1 is a cross-sectional view of a first embodiment of a release system,

FIG. 2 is an enlarged view of FIG. 1;

3 is a cross-sectional view of another embodiment of a release system,

4A and 4B are cross-sectional views of two embodiments, such as a retaining ring and a piston end cross section,

5A and 5B are cross-sectional views of embodiments using retaining rings made of plastic.

<Brief description of the major reference numerals>

Piston cylinder unit 19. Recess

2. Housing 20. Recess

3. Guide tube 21. Snap lug

4. Pressure chamber 22. Snap lug

5. Piston 23. Opening

6. Seals 24. Fusible Elements

7. Inner 25. Fixed Element

8. Outside 26. Hydraulic Duct

9. Sealing lip 27. Release bearing

10. Sealing Lip 28. Spring

11.Retaining Ring 29.End Spacing

12. End section 30. Recess

13. Installation cross section 31. Arm

14. First partial cross section 32. Shoulder

15. Second partial cross section 33. Protrusion

16. Beads 34. Cancer

17. Ring groove 35. Bearing ring

18. Undercut

It is an object of the present invention to provide a hydraulically actuated release system in which the seal fitted to the piston is blocked or stuck.

This object is solved by the features of the claims 1 with respect to the features of the paragraph 1 introduction clause of the claims. Preferred embodiments of the release system are realized by the dependent claims 2-14.

In the case of the release system according to the invention, the seal is received in such a way as to ensure a stable and actuated position by a positive fit in common with the retaining ring and the piston end section fixed to the piston so as to be fixed to the piston. At the same time the seal preferably comprises a mounting section in the foot range, which section is on the one hand by the retaining ring and on the other by the end section of the piston. It is fixed.

Through a retaining ring mounted on the piston, it is connected with a correspondingly shaped end section to form a molded part, which part, together with a correspondingly shaped mounting section, is positively fitted to the piston. Interact to fix the thread.

In the case of a release system according to the invention, therefore, a separate sealing member can be avoided, and the overall guide length can be obtained. In a preferred embodiment, the retaining ring comprises one bead that is engaged in a corresponding ring groove of the installation cross section for a positive fit connection.

According to another preferred embodiment of the invention, the front face of the piston towards the pressure room forms a bearing surface for one seal, which is arranged flat and radially. The flat support surface up to the rotating receiver for fixing the thread realizes the desired force introduction in a straight line when the thread is pressurized. At the same time the dislocation of the undesirable position of the seal in the piston is effectively prevented.

The end section of the piston, and the area of the retaining ring which secures the mounting section of the seal, etc., also include suitable form elements (e.g., one or a plurality of raised parts or ring grooves). The element is interlocked and inserted into the corresponding forming element of the installation cross section of the seal, thereby initiating a particularly secure thread fixation. The positive fitting area, such as the retaining ring and the piston end section, also includes an undercut area, into which the corresponding projecting part of the mounting cross section of the thread is stably engaged in position. Is inserted.

In another variant, the end cross section of the piston is formed as a cylinder shoulder, whereby the radial force generated is received in the seal.

Retaining rings are metal parts, for example deep drawing parts (extrusion molding parts) to injection molding parts, metal-cutting manufactured aluminum rings or injection molded plastics. It can be manufactured as a part. The connection of the retaining ring with the piston may consist of flanging, bead welding, tumbling, snap connection, gluing or welding, or the like. At the same time, these holding means can be arranged in part or in rotation. The retaining ring, which is formed as a plastic part, can be ultrasonically welded with the piston.

In another preferred embodiment of the release system, when the retaining ring is axially fixed to the piston, in order to reduce or avoid feeding problems or axial vibrations that occur during the piston movement, End clearance is provided.

If the retaining ring is connected to the piston via a snap connection with a snap lug which is inserted into the recess of the piston, a defined end distance such as the retaining ring and the resulting seal is applied to the piston. The recess may be dimensioned in a manner that may be disclosed for it.

The plastic retaining ring may include an opening for receiving a fusible element that is engaged in the recess at the piston. Corresponding dimensioning of the recesses can initiate axial movement of retaining rings and seals and the like.

The release system according to FIG. 1 comprises an inner piston cylinder unit 1 having an annular cylindrical housing 2, a guide tube 3, and the like. Between the housing 2 and the guide tube 3 there is arranged a pressure chamber 4 which is connected to a hydraulic duct 26, in which an axially movable piston 5 is arranged. Located. And such a piston comprises a sealing lip 9, 10 (sealing lip) adjoining the outer side 8 of the guide tube 3 and the inner side 7 of the housing 2, etc. via a retaining ring 11. (6) is accommodated. The release system also includes a spring 28, a release bearing 27 connected to the piston 5 by means of a fixing member 25, and the like. At the same time, the snap lug 22 of the fastening member 25 is engaged with and inserted into the recess 20 of the piston 5. 1 is a schematic of the piston 5 in the end position where the piston 5 comprising the radial shoulder 32 is supported by the cylinder protrusion 33 of the housing 2.

It is apparent from Fig. 1 that the mounting end face 13 of the seal 6 is connected to the piston 5 by a common positive fit action such as the retaining ring 11 and the end face 12 of the piston 5. Able to know.

Compared to the prior art, the end section 12 of the piston 5 is also used to positively secure the seal 6 to the piston 5.

In FIG. 1 the area of the installation end face 13 of the seal 6 is shown enlarged in FIG. In Fig. 2a a bead 16 is fitted to the retaining ring 11, which is engaged in a corresponding ring groove 17 of the installation cross-section 13, whereby a first partial cross-section ( In 14) a positive fit capture of the seal 6 is achieved by the retaining ring 11. In order to achieve a full positive fit action, the installation end face 13 of the seal 6 additionally supports a positive fit to the second partial end face 15 which is formed as a cylinder shoulder in the end section 12 of the piston 5. do.

The first and second partial cross sections 14, 15, such as the retaining ring 11 and the end cross section 12 of the piston 5 as a whole, are positive for the installation cross section 13 and the resulting seal 6. Interact with each other to create a custom capture. The retaining ring 11 comprises one snap lug 21 which is engaged in and inserted into the corresponding recess 19 of the piston 5, while at the same time the axial movement in the recess 19 is at the end interval. May be initiated by (29). By the end gap 29, unexpected feeding problems and axial vibrations can be reduced.

In Fig. 3 another embodiment of a release system is shown which is characterized by the alternative fixing of the release bearing 27 in the piston 5 as compared to Fig. 1. The fastening member 25 comprises one elongated snap lug 22 which engages and is inserted into a corresponding recess 20 ′ of the piston 5. In addition, at the end position of the release bearing 27 and the piston 5 connected thereto, a radially arranged arm 34 of the bearing ring 35 of the release bearing 27 which is not twisted is provided with a housing ( It is supported by the protrusion 33 of 2).

4A and 4B, embodiments of the first and second partial cross sections 14 and 15 and the snap lug 21 and the corresponding recess 19 are shown. FIG. 4B is a schematic of a second partial cross-section 15 of the end cross-section 12 of the piston 5 comprising one projection 18, whereby a particularly secure accommodation of the seal 6, not shown, is retained. Guaranteed by the undercut 18 of the first partial cross section 14 of the inning ring 11 and the bead 16 lying opposite thereto. In the case of the retaining ring 11 formed as a metal part, the connection and fixation in the piston 5 can also be made by flanging, tumbling, etc., in addition to the snap connection shown, (not shown).

Fig. 5a is a diagram of a retaining ring 11 made of plastic, which is connected to the piston 5 in such a way that it is fixed axially, for example by gluing or welding. The retaining ring 11 may comprise one recess 30 for receiving one (radially prestressed) fusible element 24. An arm 31 radially disposed of the fusible element 24 through the opening 23 can be inserted into the recess 19 of the piston 5 (see FIG. 5B). The corresponding end spacing 29 can be realized through the corresponding dimensioning of the recess 19.

Claims (14)

For piston friction-clutch coupling, one piston cylinder encompassing one annular cylindrical housing 2, one inner guide tube 3 with an intermediate pressure chamber 4, etc. In the pressure chamber 4 there is received a piston 5 which comprises a unit 1 and at the same time an axially movable piston 5, at the front end of such a piston 7 and a guide tube 3 of the housing 2. In a hydraulically actuated release system comprising a seal 6 having sealing lips 9, 10 adjacent to the outside of A release system characterized in that it is connected to one retaining ring 11 fixed to the piston 5 and to the end section 12 of the piston, etc., so that the seal 6 is fixed to the piston 5. . The first partial cross-section 14 is connected to the retaining ring 11 in a positive fit, and the second partial cross-section 15 is connected to the end cross-section 12 of the piston in a positive fit. Release system, characterized in that the seal (6) comprises one installation end face (13). The radial ring 16 according to claim 2, wherein the retaining ring 11 is inwardly directed for a positive fit connection with the corresponding ring groove 17 of the installation cross section 13 at the end side. Release system comprising a. 4. Release system according to claim 2 or 3, characterized in that the second partial cross section (15) extends perpendicular to the piston (5). 5. The second partial cross section 15 comprises one undercut 18 for a positive fit connection with the mounting cross section 13 of the seal 6. 6. Release system. 6. The release system according to claim 1, wherein the retaining ring 11 is fixed to the piston 5 by a snap lug 21 which engages and is inserted into the recess 19. 7. . 7. Release system according to claim 6, characterized in that a snap lug (21) comprising an end gap (29) is inserted into the recess (19). 8. Release system according to any one of the preceding claims, characterized in that the end section (12) of the piston (5) is formed as a cylinder shoulder and forms a stage. 9. The method according to claim 1, characterized in that the retaining ring 11 and / or the end cross section 12 of the piston, etc., are cut down in the region in which the seal 6 is positively fitted. Release system. 10. The method according to any one of the preceding claims, wherein the retaining ring (11) is fixed to the piston (5) by flanging, bead welding, or tumbled, and at the same time the fastening means are designed to be partially or rotated. Characterized by a release system. The release system according to any of the preceding claims, characterized in that the retaining ring (11) is fixed to the piston (5) by bonding or welding. 12. The method according to any one of claims 1 to 11, wherein the retaining ring 11 is a deep drawing part composed of steel, a metal cut manufacturing molded part, an extruded part composed of aluminum or a plastic part. A release system, characterized in that it is formed. 13. The retaining ring 11 comprises one recess 30 for receiving the fusible element 24 and at the same time the fusible element 24. Is inserted into the recess (19) of the piston (5) while being guided by the opening (23) of the retaining ring (11) with the arm (31) arranged radially. 14. Release system according to claim 13, characterized in that the fusible element (24) inserted into the retaining ring (11) using radial prestress is axially movable in the recess (19).