DE19650734A1 - Hydraulic actuating system for vehicle friction clutch - Google Patents

Abstract

The hydraulic clutch control is improved by connecting a control module (5) between the master cylinder (2) and the slave cylinder (3). The module has a bolt-on design and includes one or more control valves. Its function is to eliminate sudden transients, due eg. to variations in engine torque, and to enable a smooth clutch operation. The module is bolted directly to either the master cylinder or onto the slave cylinder eg. as an extension to the cylinder housing. The size and shape of the module depends on the layout of the clutch system. The module controls the rate of application of the clutch and reduces clutch wear. The module is connected to the system with conventional couplings.

Description

Field of the Invention

The invention relates to a hydraulic actuation system for a vehicle, used in particular to actuate a friction clutch, for which a use mechanical, electrical pneumatic or hydraulic equipment bar, in particular a transmitter device that can be activated by a pedal arrangement device in connection with a clutch-related slave device that has a Transmission device are connected, the actuation system too at least one valve element such as, prick valve, pre-pressure valve, safety valve has, to improve operational safety and / or the operating com continue.

Background of the Invention

The valve elements used in actuation systems fulfill different requirements Functions.

Valves are used to increase the functional reliability of an actuation system elements, especially pre-pressure valves. With hydraulically operated friction clutches are caused by sudden gripping of the spring washers of the Friction clutch on the release bearing race produces acceleration forces summoned to wear and premature failure of the release bearing and the  Guide drive plate. To avoid shock loads, is in the publication of the company FAG: "Information from the brake and clutch hydraulics "Publication No. IB 41 103 DA on pages 5 to 7 a valve element described with which a residual pressure in the hydraulic system is maintained can be obtained. This will keep the release moving along bearing race guaranteed and the function ensured over the operating area.

As a measure to increase ease of use in hydraulic actuators so-called tingling valves, which also act as tingling filters are referred to, with which occurring pressure surges are mitigated or are compensable. The axial triggered by drive motors in vehicles Vibrations of the crankshaft - depending on the engine design occur at different levels - are via the friction clutch or the clutch Transfer the spring to the release bearing. From there the Axial sit down vibrations in the entire hydraulic release system and cause Pressure pulsations, which are often an adverse tingling sensation in the pedal assembly trigger. To compensate or avoid this disadvantageous pressure pulsations it is known to use pressure accumulators in the actuation system. Attempts have also been made to overcome this disadvantage by extending the hydraulics meet line or in the transmission device chokes or Blen to integrate those that increase the flow resistance so that this against adverse vibrations sufficient resistance.

From DE-A 44 17 961 a tingling valve is known in which a mass sticking piston is held by a spring in a neutral position in which a pressure medium flow and thus also a pressure medium vibration through the Pre-pressure valve is largely interrupted. A persistent, focused Pressure fluid movement triggers a displacement of the control piston, which at an overlap between control bores in the control piston and circulation nut in a control cylinder a pressure medium flow through the prick valve enables.  

Another safety also used in hydraulically operated systems valve is an overload protection. This valve prevents that with a fast engagement, d. H. Loosen the vehicle coupling of the entire vehicle powertrain, d. H. the manual gearbox, the drive shaft and the drive joints from an adverse excessive torque be spared. Without a safety valve, it is necessary the drivetrain for the transmission of these occurring during a "bang start" Dimension peak load accordingly, which leads to that related the drive train is oversized to all other drive states.

From DE-PS 69 59 21 a safety valve is known that on the one hand to quickly disengage, but on the other hand a delayed engagement of the Vehicle clutch causes. The valve enables one to disengage unimpeded flow of pressure medium from the transmitter device to the slave device tion, on the other hand, the valve is largely when the pressure medium is reversed closed, which means that the pressure medium only by a throttling hole tion flows in the direction of the encoder device, and thereby sudden engagement is prevented.

The different valves are from the previously explained prior art known elements that can be used in hydraulically operated systems. Common to these valve elements is the individual arrangement in one Device, preferably in the transmission device. That requires on agile single housing for the respective valve elements, whereby the number of components and the assembly effort increases. Also poses there is a greater risk of leaks in the actuator system due to a larger number of sealing points on the screw, Crushed or plug connections between the transmission device and the separately used valve elements. The logisti continues to grow Purchase wall for the actuation system due to the separately arranged valve elements.

Object of the invention

The invention has for its object to provide an actuation system that contains one or more valve elements, while maintaining the Monta effort and the range of components with individual actuators system can be summarized.

Summary of the invention

According to the invention the task is characterized by the characteristic features of Claim 1 solved. After that is a device of hydraulic actuation systems combined with a module in which at least one valve element is integrated. This measure enables a pre-completed facility be created to create a unitary piece with one or several valve elements is provided. In addition, the invention closes thought depending on the installation situation as well as function-related The valve element or the valve elements are connected with an arbitrary one to combine the establishment of the actuation system. For example, offers it is important to integrate the tingling filter into the slave device, thereby the axial vibrations triggered by the crankshaft of the internal combustion engine can be kept away from the entire actuation system. The inventor The idea of extension also includes one or more, depending on requirements Assign valve elements to a device. Various can also ne devices can be combined with a valve element if the Installation space or for functional reasons such an assignment is required. The arrangement of the valve elements according to the invention represents a Reduction of plug or screw connections between the individual components, d. H. Facilities represent the elimination of separate Housings for individual valve elements, thereby saving costs is cash. The component reduction and the possibility of pre-assembling the with Devices equipped with valve elements also prevent assembly errors and optimizes the logistics effort. Another aspect is weight  reduction resulting from the combination of the valve elements with equipment conditions due to unnecessary individual housings for valve elements.

In an advantageous embodiment of the invention, valve elements are provided te in the connection area of the devices preferably on the transmitter device or to arrange on the slave device. The use of this connection empowered by a low design effort and / or mechanical rework the integration of one or more valves ment in a facility. In an appropriately designed installation space in the Connection area of a device made of plastic, it offers the module, whose housing is also made of plastic, to be permanently connected to the device by means of an ultrasonic welding.

An embodiment according to the invention in which the valve is particularly advantageous elements in a group unit in the module combined in one Setup of the actuation system are integrated. It is a good idea certain valve elements used according to their function in one order given order.

In order to meet different requirements, the invention provides continue to design the installation space of the module so that the valve elements can be varied both in number and in order Module can be used.

In one embodiment of the invention it is provided in an axial extension tion of a housing, for example, to arrange the module for the slave device nen. To optimize installation space and to create a protected installation is further provided according to the invention, the module in the pressure chamber Arrange slave device. The invention further provides the valve elements in the module are arranged axially or radially depending on the installation position the order is not fixed.  

Using the installation space of existing components or this through the module Filling is provided according to the invention iii a radial from the slave device exiting adapter to arrange the module. The radial distance between the slave device and a clutch housing that the Bridged adapter to create a simple connection is sufficient for the arrangement of a module with three valve elements. The radially stepped arrangement of the valve elements enables weight reduction, since the adapter that was previously common can be omitted. Also enables light this arrangement a secure attachment of the module to the slave device and also on the clutch housing.

As an alternative to a central disengagement, the invention also includes slave devices devices for a semi-hydraulically operated friction clutch, in which the slave device is arranged radially offset from the transmission shaft. For such slave devices it makes sense to the module in axial Ver extension of the housing of the slave device, preferably axially stepped, to arrange. Alternatively, a valve element can also be located in the pressure chamber such slave device can be used.

A simple solution in terms of construction effort can be seen in the transfer supply device to be provided with a housing for receiving serves one or more valve elements and thus forms a module. Preferably, the space in the housing is designed so that this one The modular principle enables valve elements to be used as desired, i.e. H. variable can be arranged. The case itself can be according to the face score a secure attachment and / or protected arrangement for example as in the engine compartment of the vehicle or directly on the internal combustion engine be arranged.

To avoid an assembly error by confusing the connections for the transmission device, the housing is at the front with different line connections and / or connection techniques.  

According to the invention, the form of pre-pressure can be used as a measure for reducing components til be designed so that this also the function of the prick valve takes over. The formation of the pre-pressure valve as a prickle valve reduces the required space and eliminates the form spring. Favored at the same time this training a free design of the screw connection.

Alternatively, the invention provides for the construction of a prickle valve that Function of the safety valve includes. For an education of the Kribbelven tils, which also takes over the function of the safety valve, offers it begin to arrange orifices upstream of the tingling valve. Furthermore The invention includes a valve element, the structure of which has multiple functions fulfilled while doing both the function of the pre-pressure and the tingling valve also fulfills the function of the safety valve.

According to the invention between the donor device and the slave device device provided can be in one embodiment of the Invention can be provided with a connection set, in the immediate one Module is integrated, the module being arranged in stages to the connection fitting is. A connection fitting made of sheet steel through a deep-drawing joint is suitable drive chipless shaped housing in which the module is integrated. The housing can also be provided in one piece with one for the transmission device NEN connector connected.

Between the transmission device and the connecting part, an unsolvable bare connection are provided with which a rotation-proof to each other positionally fixed arrangement of the components can be achieved. It is suitable for this For example, an adhesive connection in which a microencapsulated adhesive is attached the joints or alternatively an ultrasonic welding is provided.

Alternatively, a crimp connection is also suitable, with which a secure, effective attachment and sealing of the connector on the transmission facility is reachable.  

To ensure a location-oriented arrangement between the transmission device on the one hand and the donor device or the receiver device on the other hand, there is at least one rigid, non-rotatable plug connection between provided these components. Instead of a plug connection is just suitable if a screw connection, preferably provided with a microencapsule gluing or the combination of plug and screw connections. A crimp connection is also suitable for a hose connection can also be used in a combination of screw or plug connections is.

Brief description of the drawings

The invention is explained in more detail below with the aid of several exemplary embodiments explained. The individual shows:

Fig. 1 shows schematically the possible assignments of the Mo module with individual devices of the hydraulic actuation system;

Figure 2 is a schematic drawing of a module, which is equipped with a maximum of three valve elements who can who;

Fig. 3 is a longitudinal section of a master cylinder, which forms a unit with a module in which a Kribbelventil is integrated;

Fig. 4 is a master cylinder in longitudinal section, in which a pressure chamber is inserted Kribbelventil;

5 is a slave device in a sectional view, the radially outwardly facing adapter module that is equipped with a Kribbelventil Fig.

FIG. 6 shows the slave device according to FIG. 5, the safety valve in the form of an orifice being placed in front of the tapping valve;

Fig. 7 is a slave device, the adapter is formed are arranged by a module in which three different stepped radially disposed valve elements;

Figure 8 shows a slave device for a semi-hydraulic clutch actuation, on the housing axially stepped, a pre-pressure valve and a prickle valve are arranged.

Fig. 9 in a longitudinal section, a housing provided with a Mo module, in which a safety valve and a prickle valve are integrated, the housing being inserted into the transmission device in the installed state;

Fig. 10 one of the Fig. 9 largely corresponding transmission device, in which the tingling valve simultaneously takes over the function of the pre-pressure valve and the safety valve;

FIG. 11 is a transmission device in which a safety valve in the form of a diaphragm is preceded by the Kribbelventil axially;

Figure 12 shows the structure of a connection fitting, used in a transmission device, which is combined with a prickle valve.

Fig. 13 a comparable to Fig. 12 fitting with a modified connector.

Detailed description of the drawings

In Fig. 1, a schematic structure of an actuation system 1 is shown, which comprises a transmitter device 2 a, 2 b, which can be manually activated installed in a vehicle by a pedal device, not shown. The encoder device 2 a, 2 b is connected via a transmission device 4 , designed as a connecting line, to a slave device 3 a, 3 b arranged near the clutch. The actuation system 1 comprises measures with which the operational safety and / or the comfort behavior can be improved. For this purpose, a module is provided in which different valve elements can be inserted. Referring to FIG. 1, the transmitter device 2 a, 2 b with a module 6 a, wherein these components form one unit. The three-division of the module 6a is intended to illustrate that this can be equipped with three different len oz. In Fig. 1, the alternative module arrangements are also shown in dash-dot lines. Thereafter, a housing 5 can be used in the transmission device 4 , which serves to accommodate a module 6 b. In addition, the slave device 3 a, 3 b can form a unit with the module 6 c. In accordance with module 6 a, a maximum of three valve elements can also be used in modules 6 b, 6 c.

In Fig. 2, the module 6 a is enlarged to illustrate the structure. This figure shows the modular structure of the module 6 a, which can be equipped with a pre-pressure valve 7 , a prickle valve 8 and a safety valve 9 . The number of valves as well as the sequence can take place depending on requirements.

In Fig. 3, an encoder device 2 a is shown, the structure and function of which corresponds to master cylinders of known design. The encoder device 2 a comprises a piston rod 10 which is articulated on a piston 11 which is guided axially displaceably in a housing 12 . The housing 12 is provided on the side facing away from the piston rod 10 with a module 6 a which is fastened to the housing 12 via a holding bush 13 . In module 6 a, a prickle valve 8 is used, which has a disk 14 , which is inserted in a liquid-tight and gas-tight manner between an end face of the housing and a valve 15 upstream of the prickle valve 8 . The disc 14 has two radially adjacent through openings 16 a, 16 b. Valve seats 17 a, 17 b are formed on opposite ends of the disk 14 , which connect to the through openings 16 a, 16 b. Each of the valve seats 17 a, 17 b is assigned a valve body 18 a, 18 b, each of which is acted upon by a helical compression spring.

An alternative transmitter device 2 b can be seen from FIG. 4, in which the module 6 a consisting of a prickle valve 8 is integrated in a pressure chamber 36 of the housing 12 . The prick valve 8 is a rotationally symmetrical component that can be preassembled into the pressure chamber 36 and is positioned at the end facing the connector 15 and can preferably be permanently connected to the housing 12 by ultrasonic welding. The integrated tingling valve 8 reduces the number of components and enables a shortened design of the transmitter device 2 a, combined with an advantageous weight and cost reduction.

FIG. 5 is shown in an enlarged view of the structure of a housing of the slave device 3 a. The slave device 3 a has a radially outwardly directed adapter 19 , in which the module 6 c, which contains a tingling valve 8 , is inserted at the end. In the installed state of the slave device 3 a, the adapter 19 serves to bridge a radial distance between the concentrically arranged to a drive shaft slave device 3 a and a radially spaced clutch housing, the free end of the adapter 19 protruding from an opening of the clutch housing . A simplified connection of the transmission device 4 to the slave device 3 a is thus possible.

Fig. 6 also shows a slave device 3 a, which largely corresponds to the device shown in Fig. 5. In contrast to this, the module 6 c used in the adapter 19 is equipped with a safety valve 9 , which is positioned radially in front of the prickle valve 8 and is designed as an orifice 40 .

A further alternative embodiment of the slave device 3 a is shown in FIG. 7. The adapter 19 is largely replaced by the three radially staggered valve elements, safety valve 9 , prickle valve 8 and pre-pressure valve 7 , which form module 6 c. In order to ensure a pressure-dependent flow of the pressure fluid in both directions, the admission pressure valve 7 has a hollow cylindrical displaceable bushing 23 , which according to FIG. 7 is arranged at a distance from a closure part 24 . Pressurization of the admission pressure valve 7 causes an axial displacement of a valve element 25 guided in the bushing 23 in the direction of the prickle valve 8 . The pressure fluid can flow via a valve seat 26 and then through an annular gap 27 , which is formed between the valve element 25 and the bushing 23 , in the direction of the tapping valve 8 . When the direction of flow is reversed, the pressure fluid acts on an annular surface of the bushing 23 in the region of the valve seat 26 , as a result of which the bushing 23 is displaced in the direction of the closure part 24 . The axial displacement of the bushing 23 has the result that it stands out on the side opposite the closure part 24 from a sealing surface 28 , as a result of which the pressurized fluid can enter an annular channel 29 which adjusts itself between a wall 30 and the bushing 23 and thus to a connection 31 arrives.

The slave device 3 b shown in FIG. 8 is provided for a semi-hydraulic clutch actuation. In contrast to the slave device 3 a radially offset to a transmission shaft arranged slave device 3 b comprises a housing 37 in which a piston 38 is slidably guided, the piston 38 via a piston rod 39 with a not shown in Fig. 8 th release lever of the friction clutch cooperates. The housing 37 is preceded by the module 6 c, consisting of the axially staggered valve elements, the pre-pressure valve 7 and the prickle valve 8 .

From Fig. 9, the housing 5 is shown in FIG. 1 enlarged in a longitudinal section. The housing 5 , designed as module 6 b, is equipped with the prickle valve 8 , as shown and described in FIG. 3, and with the safety valve 9 . The safety valve 9 contained a ball seat made light, which is influenced depending on the direction of flow, the flow rate of the pressure fluid. In the direction of flow in the direction of the arrow, a spring-loaded valve body 21 lifts off the valve seat 20 , so that an almost resistance-free pressure fluid flow is established. A reversal of the pressure fluid flow shifts the valve body 21 to the valve seat 20 . Since the valve seat 20 is provided with at least one longitudinal groove 22 , the pressure fluid can only flow back slowly. As an alternative to the safety valve 9 described above, the tingling valve 8 can be provided with an orifice 40 with which an effect comparable to the safety valve 9 can be achieved.

Fig. 10 shows a component-optimized module 6 b, provided with a valve element which is integrated in a housing 5 corresponding to FIG. 9, which fulfills the function of both the pre-pressure valve, prickle valve and the safety valve. This multiple function is achieved by a valve element which is comparable to the prickle valve 8 according to FIG. 3. The valve body 18 a, 18 b are each supported by the bias of a valve spring 52 a, 52 b on sealing elements 53 a, 53 b, which have a damping effect. The vibration damping is supported by an interaction of the control edge 54 with the valve body 18 b. The sealing elements 53 a, 53 b can be made in one piece with the valve bodies 18 a, 18 b who the. In the case of a pressure fluid flow in the direction of the arrow, ie starting from the slave device 3 a, 3 b, the valve body 18 b is preceded by an orifice 40 which is likewise arranged in the module 6 b and which effectively prevents a sudden pressure application and an associated opening of the valve body 18 b and thus fulfills the function of the safety valve 9 .

The configuration of a connection fitting 33 , which is part of a transmission device 4 , can be seen in FIG. 11. The connection fitting 33 has a connection part 35 , which can be connected to a transmitter device 2 a, 2 b or a slave device 3 a, 3 b, preferably positioned via a plug connection. The connection fitting 33 comprises two housings 41 , 42 , between which the module 6 b, consisting of the prickle valve 8 and the safety valve 9 in the form of an orifice 40 , are inserted. To create a unit, these components are surrounded on the outside by a sleeve 43 . The connection fitting 33 also has a further connection part 44 a, to which the transmission device 4 can be connected. The structure of the tappet valve 8 provides two radially arranged valve bodies 45 a, 45 b, in a corresponding configuration, which are supported in a neutral position by the action of a compression spring 47 a, 47 b on a valve seat 46 a, 46 b. In a Kribbelventil the arrow 8 in Rich applied pressure fluid processing is the valve body 45 a preceded by a stop 40 is Kribbelventil 8, which takes over the function of the safety valve. 9

The connection set 33 b shown in FIG. 12 is provided with a housing 34 a formed without cutting from sheet metal, which on the one hand encloses the connection part 35 and the module 6 b, consisting of the tapping valve 8 , and on which the connection part 44 b is integrally formed . The outside a sawtooth shaped contour connecting part 44 b serves to receive a connecting tube 48 connected to the transmission device 4 , which is surrounded by a separate crimp sleeve 49 on the outside to secure the connecting part 44 b.

FIG. 13 is c can be seen the arrangement of a further terminal fitting 33, the housing 34 b, the connecting part 35, the module 6 b and an end engages flange 50 c arranged on the connecting part 44. To secure the position and at the same time improve the sealing of the hose line 48 pushed onto the connecting part 44 c, a sleeve-shaped projection 51 of the housing 34 b is used, which encloses the hose line 48 radially spaced from the connecting part 44 c.

Reference list

1

Actuation system

2nd

a Donor device

2nd

b Transmitter device

3rd

a slave device

3rd

b slave device

4th

Transmission device

5

casing

6

a module

6

b module

6

c module

7

Pre-pressure valve

8th

Prickle valve

9

Safety valve

10th

Piston rod

11

piston

12th

casing

13

Holding bush

14

disc

15

Connector

16

a through opening

16

b Through opening

17th

a valve seat

17th

b valve seat

18th

a valve body

18th

b valve body

19th

adapter

20th

Valve seat

21

Valve body

22

Longitudinal groove

23

Rifle

24th

Closure part

25th

Valve element

26

Valve seat

27

Annular gap

28

Sealing surface

29

Ring channel

30th

Wall

31

Connection

32

Pressure room

33

a connection fitting

33

b Connection fitting

33

c Connection fitting

34

a housing

34

b housing

35

Connector

36

Pressure room

37

casing

38

piston

39

Piston rod

40

Forms

41

casing

42

casing

43

Sleeve

44

a connector

44

b connector

44

c connector

45

a valve body

45

b valve body

46

a valve seat

46

b valve seat

47

a compression spring

47

b compression spring

48

Hose line

49

Crimp sleeve

50

flange

51

approach

52

a valve spring

52

b valve spring

53

a sealing element

53

b sealing element

54

Control edge.

Claims (19)

1. Hydraulic actuation system for a vehicle, in particular used for actuating a friction clutch, which comprises an activatable by a pedal arrangement transmitter device ( 2 a, 2 b) and a clutch-near slave device ( 3 a, 3 b), which ver via a transmission device ( 4 ) are bound, the actuation system ( 1 ) having at least one valve element such as, prick valve ( 8 ), pre-pressure valve ( 7 ) or safety valve ( 9 ), to improve operational safety and / or ease of use, characterized in that at least one device of the actuation system ( 1) with a module (6 a, b 6, 6 c) forms a structural unit, wherein in the module (6 a, 6 b, 6 c) at least one valve element is integrated. 2. Hydraulic actuation system according to claim 1, characterized in that in a connection area of the transmitter device ( 2 a, 2 b) or the slave device ( 3 a, 3 b), the module ( 6 a, 6 c) is used. 3. Hydraulic actuation system according to claim 1, characterized in that valve elements combined in a group unit in the module with are connected to a device of the actuation system. 4. Hydraulic actuation system according to claim 1, characterized by a module ( 6 a, 6 b, 6 c), which has an installation space in which the valve elements can be used both in number and in order, if necessary. 5. Hydraulic actuation system according to claim 2, characterized in that the module ( 6 a) is arranged in an axial extension of a housing ( 12 ) of the transmitter device ( 2 a) ( Fig. 3). 6. Hydraulic actuation system according to claim 5, characterized in that the module ( 6 a) in a pressure chamber ( 32 ) of the transmitter device ( 2 b) is inte grated ( Fig. 4). 7. Hydraulic actuation system according to claim 1, characterized in that in a radially from the slave device ( 3 a) emerging adapter ( 19 ) the module ( 6 c) is arranged by at least one valve element is used ( Fig. 5; Fig. 6th ). 8. Hydraulic actuation system according to claim 7, characterized in that in the slave device ( 3 a), the module ( 6 c) is inserted, the valve elements are arranged radially stepped ( Fig. 7). 9. Hydraulic actuation system according to claim 1, characterized in that the module ( 6 c) is arranged in an axial extension of a provided for a semi-hydraulic release system slave device ( 3 b). 10. Hydraulic actuation system according to claim 9, characterized in that the slave device ( 3 b) associated module ( 6 c) has axially stepped valve elements ( Fig. 8). 11. Hydraulic actuation system according to claim 1, characterized in that in the preferably a connecting line transmission device ( 4 ) a housing ( 5 ) is used, which is ausgebil det as a module ( 6 b) ( Fig. 9). 12. Hydraulic actuation system according to claim 11, characterized in that on both ends of the housing ( 5 ), the respective transmission device ( 4 ) is connected. 13. Hydraulic actuation system according to claim 1, characterized in that the pre-pressure valve ( 7 ) simultaneously takes over the function of the prickle valve ( 8 ). 14. Hydraulic actuation system according to claim 1, characterized in that a valve element is integrated in the module ( 6 b), which takes over the function of a pre-pressure, prickle and safety valve ( Fig. 10). 15. Hydraulic actuation system according to claim 11, characterized in that a connection fitting ( 33 a to 33 c) of the transmission device ( 4 ) with the module ( 6 b) is combined. 16. Hydraulic actuation system according to claim 15, characterized in that the connection fitting ( 33 b, 33 c) comprises a sheet steel sleeve ( 34 a, 34 b), into which the module ( 6 b) is integrated and the housing ( 34 a, 34 b) is also connected in one piece to a connection part ( 35 ) provided for the transmission device ( 4 ) and a hose line ( 48 ) ( FIG. 12; FIG. 13). 17. Hydraulic actuation system according to claim 15, characterized in that the transmission device ( 4 ) via the connecting part ( 35 ) is detachably connected to the transmitter device ( 2 a, 2 b) or the slave device ( 3 a, 3 b). 18. Hydraulic actuation system according to claim 11, characterized in that between the individual components of the actuation system ( 1 ) a rigid, non-rotatable, preferably plug-in connection is provided at least on one side. 19. Hydraulic actuation system according to claim 11, characterized in that any combination of plug, crimp, screw or adhesive connections between the components of the actuation system ( 1 ) is provided.