DE102017119722B3 - Clutch slave cylinder - Google Patents

Abstract

It is a clutch slave cylinder (1) having at least one first annular piston (2) which is linearly movable in a first pressure chamber (4) formed in a housing (10) in the direction of an axis (A) and having at least one second annular piston (3). formed in a second in the housing (10) formed pressure chamber (5) in the direction of the axis (A) is linearly movable. The first annular piston (2) carries at a first end (11) a sealing ring (13) and at a second end (12) a first annular actuating bearing (6). The second annular piston (3) carries at the first end (11) a sealing ring (14) and at the second end (12) has a second annular actuating bearing (7). The first annular actuating bearing (6) is an angular contact ball bearing and the second annular actuating bearing (7) is a needle bearing.

Description

The present invention relates to a clutch slave cylinder. The clutch slave cylinder comprises at least a first annular piston and at least one second annular piston. The first annular piston is in a first formed in a housing pressure chamber in the direction of an axis A movably formed. Likewise, the second annular piston in the housing in a second pressure chamber is linearly movable in the direction of the axis A educated. The first annular piston is provided at a first end with a sealing ring. At a second end, the first annular piston carries an annular actuating bearing. The second annular piston is provided at a first end with a sealing ring and carries at a second end a second annular actuating bearing.

Clutch slave cylinders for double clutches or triple clutches are widely known. The clutch slave cylinder serves to be driven by a clutch master cylinder to actuate a release or engagement system of a clutch.

The German patent application DE 10 2016 219 684 A1 discloses an actuation system for engaging and / or disengaging a clutch of a motor vehicle drive train. The clutch slave cylinder disclosed herein is suitable for a dual clutch and has two cylinders, each bearing an actuating bearing at one end. The actuating bearing is designed in each case as an annular angular contact ball bearing.

The German patent application DE 10 2015 208 385 A1 discloses a wet multiple clutch device for a vehicle and a torque transmitting device. An indenter serves to actuate the individual coupling elements and is rotatably mounted by means of a bearing or a roller bearing relative to the transmission input shaft. The indentor is part of an engagement device or a central engagement device, which is designed in particular hydraulically acting. Preferably, the indentor is designed as a CSC indentor, which is preferably formed with an annular piston. The annular piston or the annular piston are supported relative to the actuating element of the coupling by means of angular contact ball bearings.

A disadvantage of the angular contact ball bearings used in the slave cylinder is that they are expensive and require a certain amount of space. Another possibility would be to replace the angular contact ball bearings of the prior art with needle roller bearings. The needle roller bearings would be significantly cheaper and would take a smaller axial space. However, the problem with needle bearings is that they can not absorb radial forces and wobble.

A clutch slave cylinder according to the preamble of claim 1 is in the document DE 10 2015 213 516 A1 disclosed.

The object of the invention is to provide a clutch slave cylinder, which takes up less space, prevents tumbling of the clutch or the clutch slave cylinder and is designed inexpensively.

This object is achieved by a clutch slave cylinder according to claim 1.

The clutch slave cylinder according to the invention comprises at least a first annular piston and a second annular piston. The first annular piston is in a first formed in a housing pressure chamber in the direction of an axis A movably formed. Likewise, the second annular piston in the housing in a second pressure chamber in the direction of the axis A movably formed. The first annular piston carries at a first end a sealing ring and at a second end a first annular actuating bearing. The second annular piston also carries at a first end a sealing ring and at a second end a second annular actuating bearing. In this case, the first annular actuating bearing is an angular contact ball bearing and the second annular actuating bearing is a needle bearing.

At the second end of the second annular piston a support is provided with a centering. With the centering is thus the needle bearing with respect. The axis A centered.

The second annular piston in the second pressure chamber is designed as a guideless annular piston. This means that thus the second annular piston has a play in the radial direction of the clutch slave cylinder. In this case, the sealing ring is provided at the first end of the second annular piston with at least one sliding ring. With the sliding ring, it is thus possible that the second annular piston can be guided in the second pressure chamber.

Thus, the tumbling of the clutch or the pressure pot of the coupling has no effect on the second actuating bearing, which is designed as a needle bearing, the needle bearing must have an annular fixed support on the second annular piston. Due to the fixed support sufficient centering of the needle bearing is achieved with respect to the axis of the clutch slave cylinder. The second ring piston, on the other hand, must not be centered with respect to the housing of the clutch slave cylinder (CSC). By this configuration, one reaches thus a Taumelausgleich between the second actuating piston and the housing of the clutch slave cylinder. As a result, the wobble compensation does not affect the needle roller bearing.

Furthermore, a plurality of centering elements between an outer ring and a cage of the needle bearing are provided. Likewise, a plurality of second centering elements are provided between an inner ring and the cage of the needle bearing. Another possible embodiment for achieving the Taumelausgleichs may be that the second annular piston may be formed in two parts. This bipartite of the second ring piston can be z. B. reach with a joint.

So that the sealing ring at the first end of the second annular piston can withstand the tumbling motion, additional sliding rings or a sealing ring carrier can be added in the region of the second end of the second annular piston.

According to a further possible embodiment, the first centering elements may be formed on a respective contact surface with the outer ring or with the cage with at least one elevation. Likewise, the second centering elements may be formed on a respective contact surface between the inner ring and the cage with at least one elevation.

These centering elements have the advantage that they support the radial forces generated during the actuation of the needle bearing, which arise due to the rotational movement of the pressure pot or the plate fields. These provided between the cage and the inner ring, and between the cage and the outer ring centering can be made of plastic. Because of the high speeds, it is advantageous if the centering of a high-performance plastic, such. As PTFE, Torlon or PEK, can be made. The first centering elements and the second centering elements may be formed as separate components. It is also conceivable that the first centering elements and the second centering elements are molded onto the cage so that they form a unitary component together with the cage.

According to a further advantageous embodiment of the invention, the first centering elements may be designed in the form of a sliding ring and / or the second centering elements in the form of a sliding ring.

The radial clearance between the cage and the inner or outer ring should also be increased so that the slip rings or the first and second centering elements are not constantly in contact with the inner ring or the outer ring. This has the advantage that drag torques can be reduced by this design.

The centering elements or the sliding rings which have formed elevations are thus designed such that the frictional losses remain minimal (in the best case one would have no contact at this point, but a hydrodynamic state, similar to a hydrodynamic bushing). To reduce the radial forces, a plastic washer could be added to the needle roller bearing.

• 1 einen Kupplungsnehmerzylinder gemäß dem Stand der Technik;
• 2 eine Ausführungsform gemäß dem Stand der Technik, bei der das Betätigungslager als Schrägkugellager ausgebildet ist;
• 3 eine Ausführungsform des Standes der Technik, bei der das Betätigungslager als Nadellager ausgeführt ist;
• 4 eine Teilansicht des Kupplungsnehmerzylinders, bei dem die beiden Betätigungslager mit unterschiedlichen Lagertypen ausgebildet sind;
• 5 eine Querschnittsansicht eines Nadellagers gemäß dem Stand der Technik;
• 6 eine Ausführungsform des Nadellagers, das bei dem Kupplungsnehmerzylinder Einsatz finden kann; und
• 7 eine weitere Ausführungsform des Nadellagers, das bei dem Kupplungsnehmerzylinder Anwendung finden kann.

The invention and its advantages are explained below with reference to the accompanying drawings to embodiments of the invention. The invention is not limited to the embodiments shown and described. In detail shows:

• 1 a clutch slave cylinder according to the prior art;
• 2 an embodiment according to the prior art, in which the actuating bearing is designed as angular contact ball bearings;
• 3 an embodiment of the prior art, in which the actuating bearing is designed as a needle bearing;
• 4 a partial view of the clutch slave cylinder, in which the two actuating bearings are formed with different types of bearings;
• 5 a cross-sectional view of a needle bearing according to the prior art;
• 6 an embodiment of the needle bearing, which can be found in the clutch slave cylinder use; and
• 7 a further embodiment of the needle bearing, which can be found in the clutch slave cylinder application.

The drawings are not to scale, especially in comparison to each other. Like reference numerals designate like or corresponding elements.

1 shows a cross-sectional view of a clutch slave cylinder 1 according to the prior art. The clutch slave cylinder 1 includes at least a first annular piston 2 in one in a housing 10 in the direction of an axis A trained pressure room 4 is linearly movable. Likewise, a second ring piston 3 provided, which also in a second in the housing 10 trained pressure room 5 in the direction of the axis A is linearly movable. The first ring piston 2 bears at a first end 11 a sealing ring 13 , Likewise, the second ring piston carries 3 at a first end 11 a sealing ring 14 , The sealing rings 13 . 14 serve the pressure chamber 4 respectively. 5 is sealed with it no pressurized fluid can escape from the system. At the second end 12 of the first ring piston 2 is an annular first actuating bearing 6 intended. At the second end 12 of the second ring piston 3 is also an annular second actuating bearing 7 intended. With a support bearing 16 the housing is supported 10 the clutch slave cylinder 1 from.

2 shows an embodiment of the first annular actuating bearing 6 that at the second end 12 of the first ring piston 2 is appropriate. The annular actuator bearing 6 is formed in this embodiment as angular contact ball bearings. An inner ring 61 of the first annular actuating bearing 6 lies on the second end 12 of the first ring piston 2 on. An outer ring 62 of the first annular actuating bearing 6 acts on actuation on a first part clutch (not shown). At the second end 12 of the first ring piston 2 is a sealing ring 13 intended. The sealing ring 13 serves to the first pressure chamber 4 seal.

3 shows a further possible embodiment of the storage of the first annular piston or second annular piston 2 . 3 , In the embodiment shown here is at the second end 12 the first or second ring piston 2 . 3 a second annular actuating bearing 7 intended. The second annular actuator bearing 7 consists of a needle bearing. The advantages or disadvantages of using needle roller bearings 7 for clutch slave cylinders 1 is sufficiently described in the introduction to the description.

4 shows a partial view of a clutch slave cylinder 1 , the z. B. in a dual clutch (not shown) can be used. In a housing 10 the clutch slave cylinder 1 is a first pressure room 4 and a second pressure room 5 educated. In the first pressure room 4 is a first ring piston 2 in the direction of an axis A formed linearly movable. In the second pressure room 5 is a second ring piston 3 linearly movable along an axis A intended. The first ring piston 2 wears it at a first end 11 a sealing ring 13 , which is for a seal to the pressure chamber 4 ensures. At a second end 12 is the first ring piston 2 with a first annular actuating bearing 6 Mistake. The first annular actuator bearing 6 is an angular contact ball bearing with an inner ring 61 and an outer ring 62 , The second ring piston 3 is at a second end 12 with a second annular actuating bearing 7 Mistake. The second annular actuator bearing 7 is a needle bearing. The needle bearing includes an outer ring 21 and an inner ring 23 both a cage 22 surround. Likewise, at the second end 12 of the second ring piston 3 an edition 8th provided the needle bearing 7 in relation to the axis A centered. The second ring piston 3 is in the direction of the axis A in the second pressure chamber 5 designed as a guideless ring piston. The second ring piston 3 can thus play in the radial direction R take up. The housing 10 the clutch slave cylinder 1 also relies on a support bearing 16 from. The sealing ring 14 at the first end 11 of the second ring piston 3 can with a slip ring 15 be provided. Likewise, the first ring piston 2 on the sealing element 13 with a sliding ring 15 be provided. To a guide of the second ring piston 3 in the pressure room 5 to ensure is at a free end 19 the housing 10 or the trained second pressure chamber 5 with a cone-shaped support 18 Mistake.

5 shows a cross section through an annular needle bearing 7 , according to the prior art. The annular needle bearing 7 includes an outer ring 21 a cage 22 and an inner ring 23 , The cage 22 holds the rolling elements 24 of the annular needle bearing 7 ,

6 shows an annular needle bearing 7 like the clutch slave cylinder 1 Use finds. In the annular needle bearing 7 are several first centering elements 31 between the outer ring 21 and the cage 22 intended. Likewise, several second centering elements 41 between the inner ring 23 and the cage 22 intended. As already described above, the first and the second centering serve 31 . 41 for trapping the radial forces acting on the needle bearing 7 by the rotational movement of the pressure pot or the plate spring of the clutch (not shown) act. The first several centering elements 31 can also be designed as a single centering ring, the z. B. directly to the cage 22 can be injected. Likewise, the second plurality of centering elements 41 be formed as a single centering or sliding ring. Again, the centering ring 41 directly to the cage 22 be sprayed. So that the centering elements 31 , respectively. 41 not in constant contact with the outer ring 21 , or inner ring 23 is, is a radial distance 25 between the cage 22 and the inner ring 23 greater than a radial thickness 47 the second centering elements 41 and a radial distance 27 between the cage 22 and the outer ring 21 is greater than a radial thickness 37 the first centering elements 31 ,

7 shows a further embodiment of the radial needle bearing 7 that at the clutch cylinder 1 Use finds. The first centering elements 31 or the first centering ring 31 can do this at the respective contact surfaces 33 with the outer ring 21 or the cage 22 with at least one survey 35 be provided. The at least one survey 35 the plurality of first centering elements 31 or of the centering ring may be formed annularly or in the form of a plurality of knobs. The plurality of at least second centering elements 41 or the second centering ring 41 have at their respective contact surfaces 43 between the inner ring 23 and the cage 22 at least one survey 45 educated. Analogous to the surveys 35 the plurality of first centering elements 31 are these surveys 45 annular or in the form of knobs.

LIST OF REFERENCE NUMBERS

1

Clutch slave cylinder

2

first ring piston

3

second ring piston

4

first pressure chamber

5

second pressure chamber

6

first annular actuating bearing

7

second annular actuating bearing

8th

edition

10

casing

11

first end

12

second end

13

seal

14

seal

15

sliding ring

16

support bearing

18

cone-shaped support

19

free end

21

outer ring

22

Cage

23

inner ring

24

rolling elements

25

radial distance

27

radial distance

31

first centering element

33

contact area

35

survey

37

radial thickness

41

second centering element

43

contact area

45

survey

47

radial thickness

61

inner ring

62

outer ring

A

axis

R

radial direction

Claims (7)

Clutch slave cylinder (1) having at least one first annular piston (2) which in a first in a housing (10) formed pressure chamber (4) in the direction of an axis (A) is linearly movable and with at least one second annular piston (3) in a second pressure chamber (5) formed in the housing (10) is linearly movable in the direction of the axis (A), the first annular piston (2) having a sealing ring (13) at a first end (11) and a second end (12) a first annular actuating bearing (6) and the second annular piston (3) at the first end (11) a sealing ring (14) and at the second end (12) carries a second annular actuating bearing (7), wherein the first annular actuating bearing (6) a Angular contact ball bearing is and the second annular actuating bearing (7) is a needle bearing and at the second end (12) of the second annular piston (3) has a support (8) is provided with a centering, so that the needle bearing (7) with respect to the axis (A) centered is characterized by hnet that the second annular piston (3) in the second pressure chamber (5) is a guideless annular piston, which thus has a play in the radial direction (R) and a plurality of first centering elements (31) between an outer ring (21) and a cage (22 ) of the needle bearing (7) and a plurality of second centering elements (41) between an inner ring (23) and the cage (22) of the needle bearing (7) are provided. Clutch slave cylinder (1) to Claim 1 , wherein the sealing ring (14) at the first end (11) of the second annular piston (3) carries at least one sliding ring (15). Clutch slave cylinder (1) to Claim 1 or 2 in which the first centering elements (31) have formed at least one elevation (35) on a respective contact surface (33) with the outer ring (21) or the cage (22) and the second centering elements (41) on a respective contact surface (43). between the inner ring (23) and the cage (22) has formed at least one elevation (45). Clutch slave cylinder (1) according to one of Claims 1 to 3 wherein a radial distance (25) between the cage (22) and the inner ring (23) is greater than a radial thickness (47) of the second centering elements (41) and a radial distance (27) between the cage (22) and the Outer ring (21) is greater than a radial thickness (37) of the first centering elements (31). Clutch slave cylinder (1) according to one of Claims 1 to 4 , wherein the first centering elements (31) and the second centering elements (41) consist of plastic. Clutch slave cylinder (1) according to one of Claims 1 to 5 , wherein the first centering elements (31) and the second centering elements (41) are injection-molded separate components or on the cage (22). Clutch slave cylinder (1) according to one of Claims 2 to 6 , wherein the first centering elements (31) in the form of a sliding ring (15) and / or the second centering elements (41) in the form of a sliding ring (15) are formed.

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