DE102015204230A1 - Housing arrangement for an actuating cylinder of a hydraulic clutch - Google Patents

Abstract

The present invention relates to a housing arrangement (10), comprising a cylinder housing (12), wherein the cylinder housing (12) at least one cylinder (14, 16), in which an actuating piston (18, 20) is movably mounted, wherein by displacing the actuating piston (18, 20) can be actuated by an actuating element (22) acting on a pressure plate, wherein the cylinder housing (12) is displaceably arranged in particular on a guide housing (24) and substantially parallel to the actuating direction (22) of the actuating piston (18, 20) relative to the pressure plate and to the guide housing (24) is displaceable. In summary, the above-described housing arrangement (10) therefore provides a measure which, due to the material of the cylinder housing (12) and the wear-related increase in the volume absorption of hydraulic fluid in an actuation of the actuating cylinder (18, 20) compensate particularly effectively and thus to limit the piston stroke or reduce.

Description

The present invention relates to a housing arrangement for an actuating cylinder of a hydraulic clutch with an advantageous wear adjustment or reduction of a piston stroke. The present invention further relates to a hydraulic coupling system having such a housing arrangement.

Out DE 10 2009 035 225 A1 and WO 2009/056092 A1 such as WO 2008/058508 A1 is in each case a friction clutch with a displaceable by a lever spring relative to a counter-plate pressure plate known to frictionally press a clutch disc between the counter-plate and the pressure plate. In the force direction between the lever spring and the pressure plate, a path-controlled adjusting device is provided, in which at a sufficiently large wear-related stroke of the pressure plate ramps can slide on each other, so that the distance of the lever spring readjusted to the pressure plate and the increased by the wear of friction linings of the clutch disc stroke at least is partially compensated, whereby substantially the original stroke in the new condition of the friction linings can be restored.

In particular, when the cylinder housing is formed of a comparatively less stable material, the volume absorption can result in a actuation of an actuating cylinder by a deformation of the housing to a relatively large piston stroke. This can be further enhanced in a conventional manner by wear of the friction linings.

A disadvantage of the solutions known from the prior art, it may therefore be particular that the volume intake and the wear path can lead to technical requirements or problems in the production of actuation systems.

It is therefore the object of the present invention to provide a measure with which at least one disadvantage of the prior art can be at least partially eliminated.

The object is achieved according to the invention by a housing assembly having the features of claim 1. The object is achieved according to the invention further by a hydraulic coupling system with the features of claim 8. Preferred embodiments of the invention are set forth in the dependent claims, in the description or the figures Wherein other features described or shown in the subclaims or in the description or the figures, individually or in any combination, can constitute an object of the invention, if the context does not clearly indicate otherwise.

The housing arrangement according to the invention comprises a cylinder housing, wherein the cylinder housing has at least one cylinder in which an actuating piston is movably mounted. It can be actuated by a displacement of the actuating piston acting on a pressure plate actuator. It is further provided that the cylinder housing is arranged displaceably in particular on a guide housing and is displaceable substantially parallel to the actuating direction of the actuating piston relative to the pressure plate and in particular to the guide housing.

An above-described housing arrangement creates a particularly advantageous wear adjustment and / or a reduced volume absorption of hydraulic fluid in an actuation of the actuating cylinder.

The above-described housing arrangement is used in particular for use in a hydraulically actuated coupling system. For this purpose, the housing arrangement comprises a cylinder housing. The cylinder housing has at least one cylinder, wherein the number of cylinders is dependent on the exact configuration of the coupling system. For the non-limiting case of a clutch system with a dual clutch, for example, the cylinder housing has two cylinders.

The functionality of the respective cylinder can be known in principle to the person skilled in the art. The cylinder has, for example, a fluid-flowable pressure chamber in which the actuating piston is axially movable. In this case, spring elements can be used, which serve to apply a bias to the piston or the support in the return movement. The actuating piston may have about corresponding sealing means, by means of which it bears sealingly against the cylinder. In this case, for example, a primary seal and a secondary seal may be provided. Such an arrangement of an actuating piston in a cylinder chamber or cylinder, such as a slave cylinder, is widely known to the skilled person and is therefore not described in detail.

The cylinder can thus serve as a slave cylinder to actuate an actuator or an actuator, such as an engagement lever or a release lever of a hydraulic clutch. Thus, a cylinder, in particular for a hydraulic clutch system, can basically be configured in a manner known per se and actuate a clutch, such as a dual clutch.

Accordingly, by displacing the actuating piston an acting on a pressure plate actuator can be actuated. In known manner, the actuator may be, for example, designed as a plate spring lever spring or the clutch can also be closed directly by an engagement bearing, in the sense of a directly pressed-coupling. The actuator is then the engagement bearing itself. Furthermore, the pressure plate in a conventional manner friction linings of the clutch compress during actuation. If due to wear of the friction linings of the friction clutch a corresponding increase in the wear of the stroke of the pressure plate is necessary, the housing arrangement described here offers the advantage of a particularly advantageous wear adjustment.

With respect to a wear adjustment, it is provided that the cylinder housing is arranged displaceably, wherein the cylinder housing can be arranged in particular on, such as in, a guide housing. Thus, not only a cylinder housing needs to be provided which has one or more than one cylinder, but in a housing arrangement described here can advantageously be provided a further housing, on or in which the cylinder housing can be at least partially arranged. In particular, a part of the cylinder housing may be arranged in the guide housing, which may be arranged at least partially opposite to the cylinder or the pressure plate.

For the wear adjustment, it may be provided that the cylinder housing is displaceable substantially parallel to an actuating direction of the actuating piston relative to the pressure plate and in particular to the guide housing. In the context of the invention, a substantially parallel displacement should include an exactly parallel displacement, as well as an approximately parallel displacement, for example with a deviation of +/- 30 °, advantageously +/- 10 °.

By a previously described embodiment, it may be possible that not only about the actuating piston or its rest position in a fixed cylinder relative to the pressure plate are displaced. Rather, the entire cylinder housing can be displaced relative to and in particular in the direction of the pressure plate and in particular relative to the guide housing. As a result, the entire cylinder can be moved, which can allow a particularly effective wear adjustment.

For this purpose, for example, the guide housing can be fixed in a fixed position and the cylinder housing can be displaced relative to the guide housing.

By a housing arrangement described here, it can be made possible by the fact that the cylinder housing is made of a relatively less dimensionally stable material. The effective wear adjustment can effectively counteract the disadvantages of such materials which can occur in the prior art solutions. In detail, in housings of relatively less dimensionally stable materials there is the risk that the radial rigidity of the housing may be smaller compared to metal housings. As a consequence, this has a very large volume intake of hydraulic fluid, such as brake fluid, when the actuating piston is actuated. The volume increase continues to increase at high operating temperature. This additional volume would result in conventional designs to a very large stroke of the actuating cylinder. During the life leads in addition to the above-described volume requirement wear of the friction linings to a further increase in the stroke of the actuating cylinder.

Due to the above-described embodiment, at least the above-described stiffness losses can be at least partially compensated, which can reduce or compensate for the piston stroke both in a wear of the friction linings and in a material-related increase in the cylinder.

Thereby, the selection of the material for forming the cylinder housing can be increased, which can allow improved adaptability, a lower weight and lower costs.

In summary, the above-described housing arrangement therefore provides a measure which, due to the material of the cylinder housing as well as the wear-related increase in the volume intake of hydraulic fluid to compensate for an actuation of the actuating cylinder particularly effective and thus to limit or reduce the piston stroke.

In a preferred embodiment, the cylinder may be a hydraulic Zentralausrücker, which is also referred to as CSC (English: concentric slave cylinder). Accordingly, the cylinder housing may be a so-called CSC housing. In particular, in such housings or cylinders can be made possible by the above-described embodiment, an effective compensation of an increase in the stroke of the actuating piston and also be desirable, since in such cylinders often act high pressures and further directly in these cylinders a changing piston stroke makes noticeable.

In a further preferred embodiment, it may further be provided that the cylinder housing is formed from a plastic. For example, the cylinder housing may consist of a plastic. For example, a polyamide may be selected as the plastic and / or the plastic may be fiber-reinforced. An example of a suitable plastic is about the commercial under the trade name Grivory HTV 5H1 commercially available from the company EMS Chemie AG. In particular, in an embodiment of the cylinder housing made of a plastic can occur by a reduced rigidity of the housing, which may be particularly pronounced especially at elevated temperatures, an increased volume of hydraulic fluid. This volume increase then leads in particular compared to metallic housings to an increased stroke of the actuating piston. For in particular, when the cylinder housing is formed of a plastic, the volume absorption can result in an actuation of an actuating cylinder by a deformation of the housing to a relatively large piston stroke. Thus, it can be made possible by the above-described housing assembly to use a plastic housing, which was often not possible or only partially possible in the solutions of the prior art. In this case, the enabling of a plastic housing can allow the housing to be produced in a particularly cost-effective manner. In addition, a plastic housing can have the advantage of a particularly low weight. This allows operation with reduced fuel consumption in mobile applications, such as in a motor vehicle.

In a further advantageous embodiment, it may further be provided that between the cylinder housing and the guide housing a hydraulic fluid fillable pressure chamber is arranged such that the cylinder housing by adjusting a hydraulic pressure in the pressure chamber substantially parallel to and thus in or against the operating direction of the actuating piston is displaceable relative to the pressure plate and in particular to the guide housing. This embodiment can be formed particularly inexpensively, since only one pressure chamber needs to be formed, which can be acted upon with hydraulic fluid in a controlled manner. For example, the pressure chamber can be connected to the already provided for actuating the actuating cylinder hydraulic system, which further reduces the structural requirements. In this case, a valve may be provided to guide hydraulic fluid controlled in the pressure chamber and so to relocate the cylinder housing. The pressure chamber should understandably be sealed pressure-tight to the outside.

In a further advantageous embodiment, it may further be provided that a mechanical wear adjustment device is provided, through which the cylinder housing is displaceable substantially parallel to the actuating direction of the actuating piston relative to the pressure plate and in particular to the guide housing. This embodiment can be based on known mechanical devices, so that an implementation can be particularly simple and inexpensive.

In a further advantageous embodiment, a fixing means for fixing the cylinder housing may be provided in a direction substantially parallel to the actuating direction of the actuating piston. By such a fixing means, the cylinder housing can thus be fixed in a displaced position, which can allow a particularly reliable wear adjustment or reduction of the piston stroke. For example, the fixing means may be designed as a check valve in the case of a hydraulic displacement of the cylinder housing, or the fixing means may be designed as a mechanical blockage, for example in the form of a notched element, in the case of a mechanical displacement of the cylinder housing.

With regard to further technical features and advantages of the above-described housing arrangement, reference is hereby explicitly made to the explanations in connection with the hydraulic coupling system, the figures and the description of the figures, and vice versa.

The subject of the present invention is furthermore a hydraulic coupling system which has a previously described housing arrangement. In this case, the hydraulic clutch system, for example, be part of a vehicle, such as a motor vehicle, such as a car or a truck. Furthermore, the hydraulic clutch system may have about a double clutch. The housing arrangement may in particular have a CSC housing.

In summary, the above-described coupling system provides a measure that can effectively compensate for an increase in the volume intake due to the material of the cylinder housing and the wear-related increase in volume intake of hydraulic fluid upon actuation of the actuating cylinder and thus limit the piston stroke.

In the following, particularly preferred embodiments of the invention will be described with reference to FIG explained in the accompanying drawings, it being explicitly noted that the subject invention is not limited to the described embodiment. Show it:

1 a schematic sectional view of a housing assembly according to an embodiment of the invention; and

2 a schematic sectional view of a housing assembly according to a further embodiment of the invention.

In 1 is a housing arrangement 10 shown a cylinder housing 12 having, wherein the cylinder housing 12 at least one cylinder 14 , according to 1 two cylinders 14 . 16 , in which in each case an actuating piston 18 . 20 is movably mounted. The cylinder housing 12 is in particular a CSC housing. Furthermore, the cylinder housing 12 at least partially, in particular be formed completely from a plastic.

It is by a displacement of the actuating piston 18 . 20 a on an unillustrated pressure plate attacking actuator 22 . 23 actuated. The actuator 22 . 23 can, like this in the 1 is shown, for example, directly be an engagement bearing. It is provided that according to 1 the cylinder housing 12 in a guide housing 24 is arranged displaceably and substantially parallel to the actuating direction of the actuating piston 18 . 20 relative to the pressure plate and to the guide housing 24 is relocatable.

To realize this, it is in the embodiment according to 1 provided that between the cylinder housing 12 and the guide housing 24 a hydraulic fluid fillable pressure chamber 26 is arranged. The pressure room 26 serves as a wear compensating pressure chamber and is by sealant 28 . 30 sealed. This pressure room 26 is arranged such that the cylinder housing 12 by adjusting a hydraulic pressure in the pressure space 26 substantially parallel to the actuating direction of the actuating piston 18 . 20 relative to the pressure plate and to the guide housing 24 is relocatable. For this purpose, the pressure chamber can be acted upon by hydraulic fluid.

In particular, the pressure chamber 26 connected to the already existing hydraulic system, wherein a hydrostatic clutch actuator 36 next to the pressure room 26 the cylinders 14 . 16 over two hydraulic lines 38 . 40 can apply hydraulic fluid.

It can according to 1 be provided that the hydraulic lines 38 . 40 over valves 32 . 33 , such as via solenoid valves, with a hydraulic line 41 are connected, which in turn connected to the pressure chamber 26 connected is. If, for example, the valve 32 When the fluid is opened, the fluid may be pressurized, such as by electrical actuation from the hydrostatic clutch actuator 36 or master cylinder (HCA) directly into the pressure chamber 26 inflow instead of into the cylinder 14 , This can be done in particular when the clutch system is in an idle state, that is, for example, when a vehicle is stationary, since disturbances during the drive can be avoided in this way. As a result, through the pressure chamber 26 the cylinder housing 12 depending on the wear of the clutch or the enlarged piston stroke or stroke of the actuating piston 18 be moved by about when a vehicle is stopped hydraulic fluid into the pressure chamber 26 is pushed.

When the pressure room 26 Under pressure, the cylinder housing moves 12 in the direction of the clutch or pressure plate. The pressure shifts the cylinder housing 12 what is right on the piston 18 and 20 suppressed. As soon as the increased stroke is compensated, the pressure in the pressure chamber remains 26 in particular, by providing a fixative 34 , For example, a check valve or check valve, such as in the line 41 , is feasible. Once the increased stroke is compensated, the valve can 32 be opened again so as to establish a connection between the clutch actuator 36 and the cylinder 14 to create. The hydraulic fluid can now return to the cylinder 14 fill.

The above applies equally to an operation of the cylinder 16 connected valve 33 as well as for joint operation of the two valves 32 . 33 ,

In the 2 is a further embodiment of a housing arrangement 10 shown. In the embodiment according to 2 In particular, it is provided that a mechanical fixative 34 is provided.

In detail is a notch element 44 provided, against which a locking element 46 by the power of a spring 48 is pressed. This allows a fixation and a return movement of the cylinder housing 12 be blocked. Moving the cylinder housing 12 can be done as described above using a hydraulic system, wherein the pressure within the pressure chamber 26 However, not necessarily maintained, but the position of the cylinder housing through which the mechanical fixation 34 can be ensured.

LIST OF REFERENCE NUMBERS

10

 housing arrangement

12

 cylinder housing

14

 cylinder

16

 cylinder

18

 actuating piston

20

 actuating piston

22

 actuator

23

 actuator

24

 guide housing

26

 pressure chamber

28

 sealant

30

 sealant

32

 Valve

33

 Valve

34

 fixative

36

 hydrostatic clutch actuator

38

 hydraulic line

40

 hydraulic line

41

 hydraulic line

44

 notch element

46

 locking element

48

 feather

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 102009035225 A1 [0002]
• WO 2009/056092 A1 [0002]
• WO 2008/058508 A1 [0002]

Claims (8)

Housing arrangement, comprising a cylinder housing ( 12 ), wherein the cylinder housing ( 12 ) at least one cylinder ( 14 . 16 ), in which an actuating piston ( 18 . 20 ) is movably mounted, wherein by displacing the actuating piston ( 18 . 20 ) an actuator engaging on a pressure plate ( 22 ) is actuated, characterized in that the cylinder housing ( 12 ) in particular on a guide housing ( 24 ) is arranged displaceably and substantially parallel to the actuating direction of the actuating piston ( 18 . 20 ) relative to the pressure plate and in particular to the guide housing ( 24 ) is displaceable. Housing arrangement according to claim 1, characterized in that the cylinder ( 14 . 16 ) is a hydraulic Zentralausrücker. Housing arrangement according to claim 1 or 2, characterized in that the cylinder housing ( 12 ) is molded from a plastic, in particular consists of a plastic. Housing arrangement according to one of claims 1 to 3, characterized in that between the cylinder housing ( 12 ) and the guide housing ( 24 ) a hydraulic fluid fillable pressure chamber ( 26 ) is arranged such that the cylinder housing ( 12 ) by adjusting a hydraulic pressure in the pressure space ( 26 ) substantially parallel to the actuating direction of the actuating piston ( 18 . 20 ) relative to the pressure plate and in particular to the guide housing ( 24 ) is displaceable. Housing arrangement according to one of claims 1 to 3, characterized in that a mechanical wear adjustment device is provided, through which the cylinder housing ( 12 ) substantially parallel to the actuating direction of the actuating piston ( 18 . 20 ) relative to the pressure plate and in particular to the guide housing ( 24 ) is displaceable. Housing arrangement according to one of claims 1 to 5, characterized in that the housing arrangement ( 10 ) Is part of a clutch, in particular a double clutch. Housing arrangement according to one of claims 1 to 6, characterized in that a fixing means ( 34 ) for fixing the cylinder housing ( 12 ) in one of the actuating direction of the actuating piston ( 18 . 20 ) is provided in substantially parallel direction. Hydraulic coupling system, characterized in that it has a housing arrangement ( 10 ) according to one of claims 1 to 7.

Images