DE102013226261A1 - Pulling rolling diaphragm cylinder for a disengagement / actuation system with heat compensation - Google Patents

Abstract

The invention relates to a hydraulic actuation system for a motor vehicle, with a first hydraulic cylinder and a second hydraulic cylinder, which is each provided with a housing and a piston that can be moved longitudinally thereto, the hydraulic cylinders each having a pressure chamber containing hydraulic fluid and being connected to one another via a hydraulic fluid line, which defines a hydraulic path, the first hydraulic cylinder being or being in operative connection with an actuator and the second hydraulic cylinder being or being able to be brought in operative connection with an unlocking and / or locking device, such as a door opening or door locking unit, the two hydraulic cylinders being the Line and the hydraulic medium fluid consist of such a material and materials that an axial expansion of the hydraulic path is minimized.

Description

The invention relates to a hydraulic actuation system for a motor vehicle, such as a car or a commercial vehicle, with a first and a second hydraulic cylinder, each having a housing and a longitudinally movable piston, wherein the two hydraulic cylinders each have a hydraulic fluid fluid-containing pressure chamber and a hydraulic medium line with each other are connected, which defines a hydraulic path, wherein the first hydraulic cylinder with an actuating member, such as a door handle or a door lever, operatively connected and the second hydraulic cylinder with a locking and / or locking device, such as a door opening or door locking unit, such as a lock , in context.

Under a door and a flap, such as a hood and a trunk lid is subsumed.

From the prior art actuation systems for door locks are already known, such as from US 3,400,962 and the DE 2908613 C2 , This Bowden cables are used.

Locks for a door of a motor vehicle are also from the DE 199 49 037 A1 known. There it is disclosed that a door lock can be arranged on a door of a motor vehicle, which is coupled to a arranged on the door door handle for opening the door lock, wherein the door handle is fluidly coupled to the door lock. Under a fluidic coupling is understood there a pneumatic or hydraulic actuation. It is disclosed that pneumatic or hydraulic couplings are realized.

A hydraulically operated door lock is further in the US 2298776 disclosed. Devices for locking and unlocking door locks, using hydraulic devices, are also the US 4541258 refer to.

The DE 10 2004 037 299 A1 further discloses a door operating device with a vehicle door with an adjustably mounted door handle, with a door lock, with a motion-transmitting transmission element between the adjustable door handle and a locking device of the door lock, and with a securing device which prevents an unlocking position opening the door lock in an accidental displacement tendency of the door handle. It is pointed out that the transmission element has a closed transmission medium system which contains a transmission medium which comprises the transmission medium system a flexible, tubular transmission line, in the line course a line narrowing throttle is arranged so that a volume-displacement element is arranged on each side of the transmission line whose volumes filled with transmission medium are connected to each other through the transmission line containing the throttle and of which at least one of its sliding part is connected directly or indirectly in terms of movement with the door handle.

A similar way goes the EP 0 936 102 A1 which discloses an actuator using hydraulic elements, but for a locking device on a vehicle seat.

Locking and locking systems for doors or flaps are also from the pamphlets EP 1 273 744 A2 and DE 102 28 978 B4 disclosed. There are also disclosed special circuit diagrams for driving a slave cylinder by multiple master cylinder.

The previously known actuation systems, such as those that use floor cables, are unfortunately not always maintenance-free and are disadvantageous compared to hydraulic systems. However, in hydraulic systems, a reservoir of liquid must be maintained and tolerated by the usual moving seals, which in turn leads to maintenance activities such as replacement of the seals and replenishment of hydraulic fluid.

The known systems are usually not maintenance-free, especially when cable systems are used. In hydraulic systems usually a reservoir must be kept, which is undesirable. Furthermore, in hydraulic systems, as a rule, the seals wear off, since these are moved. It is also striking that, due to the influence of temperature, inadequate precision sets in hydraulic actuation systems. This is also observed in cable systems. This is often because the actuation systems vary in length or shorten.

It is an object of the present invention to eliminate such disadvantages and to provide a friction-reduced, wear-free and maintenance-free as possible operating system configuration, which also has a long life. In particular, the design constraints common in cable systems, such as those caused by the radii in cable systems, should be resolved.

This object is achieved in a generic hydraulic actuation system according to the invention that the two hydraulic cylinders, the line and the hydraulic fluid fluid consist of such a material or such materials that an axial extent of the hydraulic path is minimized. A hydraulic cylinder is not necessarily understood to mean only a cylinder-like or hollow-cylinder-like configuration, but ultimately a conglomerate of housing, pistons, seals, connections and other relevant components which constitute a hydraulic actuation system.

Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

Thus, it is advantageous if in the first hydraulic cylinder and / or the second hydraulic cylinder, a rolling diaphragm limits the pressure chamber. Such a rolling diaphragm is, for example, from the DE 89 33 547 U1 known. There are disclosed devices for transmitting forces and movements between two hydraulic actuators. In particular, the use of a rolling diaphragm in a hydraulic control of a piston-cylinder group, which could also be referred to as a hydraulic cylinder known. It is disclosed there that two chamber variable volumes are formed on opposite sides of a rolling diaphragm, of which the first chamber of the working fluid and the secondary chamber are occupied by a fluid, and further the first chambers of the cylinders are connected to a flexible tube made of polymeric material and having a reinforcing structure in its wall, such that the tube is inextensible under pressure changes between the two cylinder-moved liquids, but deformable in the longitudinal direction to assume arcuate shapes between the two cylinders, determined by radii of curvature from substantially to to 30 mm, in each of the piston-cylinder groups, the distance between the maximum outer dimension of the piston and the inner wall of the cylinder is in the range of three to five times the thickness of the diaphragm, the piston having a central portion of reduced cross-section, un d that a device for guiding and centering this piston part is arranged in the second chamber occupied by the working fluid.

An advantageous embodiment is further characterized in that the housing and / or the piston of the first hydraulic cylinder and / or the second hydraulic cylinder made of plastic, such as polyamide, about PA6-12 is made. As a result, the overall system can be manufactured relatively inexpensively.

If a liquid, a mixture (or an emulsion or suspension), such as water with antifreeze, brake fluid or oil in the two pressure chambers of the two hydraulic cylinders and the hydraulic medium line is included as a hydraulic fluid, then a cost-effective hydraulic means can be used, which in conjunction with material Cleverly configured hydraulic cylinders prevent a change in length (expansion or shortening) of the hydraulic path under the effect of temperature.

It is also expedient if the piston is at least partially disposed in the housing. As a result, either the piston can be held and the housing can act to trigger the movement, or the housing can be held fast and the piston can act to trigger movement. In both cases, a relative movement takes place between the pistons and the housings, wherein this relative movement is initiated by a pressure or tension element.

In order to avoid leakage, it is advantageous if the rooms are sealingly fixed on a housing-fixed closure, on the piston and / or on the housing.

The freedom of design is increased when the piston protrudes through a designed approximately as a housing bore housing passage and / or rests from outside the pressure chamber at a central portion of the rolling diaphragm, wherein an open end of the formed as a sack rolling diaphragm on a housing-fixed component, such as the housing closure, sealing is mounted, or a first end of the tube formed as a rolling diaphragm on a housing-fixed component, such as the housing itself, sealingly mounted and a second end of the rolling diaphragm is sealingly attached to the piston, or an open end of the bag formed as a rolling diaphragm on a piston-fixed component , as the piston itself, is sealingly attached.

The load capacity of the actuation system is improved when a support sleeve is provided between the rolling diaphragm and the housing, which supportively acts on the rolling diaphragm in the radial direction. The life expectancy is thereby improved. It is also advantageous if the support sleeve with the piston is coupled. Relative movements between the rolling diaphragm and the housing are thereby reduced or even eliminated, depending on how large the axial length of the support sleeve. Advantageously, the support sleeve is dimensioned so large, so has such an axial length that even in the largest state of the pressure chamber, the rolling diaphragm does not come into contact with an outer housing.

The applicability of a hydraulic actuation system is improved when a pull rod or pull rope is connected to the housing.

In other words, the invention relates to a transmission system for forces as a replacement for cable systems for actuating door unlockings. Cable systems have to comply with certain minimum installation radii, which is now unnecessary. In particular, it is proposed to use a release system based on the principle of the rolling diaphragm cylinder, in which the axial extent of the hydraulic section due to temperature fluctuations is markedly reduced by means of a favorable choice of materials and operating fluids. The complete system can or should be prefilled. The rolling diaphragm cylinders are designed as traction-transmitting cylinder, so that a cable system can be replaced without changing the connection.

While hydraulic release systems so far usually have a primary space in which the pressure is built up, and have a secondary space which is connected to a reservoir, can now be dispensed with such a reservoir. In the unactuated state, the primary and secondary rooms were previously connected. While this earlier when heating up this link or cooling led to a fluid balance through holes, now a release system can be represented with a rolling diaphragm cylinder, which manages for cost and space reasons without a secondary space and at the temperature fluctuations in a comparable or smaller axial length , occurs. The system is completely pre-filled. A self-actuation of the system due to the heating and thereby underlying axial expansions of the transmission path can be avoided. The actuation of the hydraulic route changes in the invention but due to cooling and contraction no longer, creating a safer opening of the lock is made possible. The number of parts is reduced in the invention, resulting in a more cost-effective design of the construction.

It is advantageous if a membrane is contained in the housing, which acts sealingly between the housing and the piston. The piston is doing a pin, which dips into the housing and is guided in the housing bore. The housing supports the membrane in the radial direction. In each case, the membrane is fixed in the axial direction via a circumferential bead configuration on the housing closure, wherein the bead configuration / the bead seals between the housing closure and the housing. It is a snap connection in the axial direction can be used. The line opens into the housing closure. Such a system can be realized as a fully filled system without a plug connection. It is located on the housing closure of the master cylinder or the slave cylinder, an inlet through which the filling can take place and which is closed by means of a sealing plug.

If the piston is pressed into the housing on the encoder side, the diaphragm rolls onto the piston. By immersing the piston in the housing liquid is displaced from the donor to slave side. On the slave side, the reverse mechanism takes place. The piston is pushed out of the housing and the membrane rolls off the piston.

Such a system can be used instead of a cable between a door handle and a door lock. In this case, cable tensile forces can be present around the 20 N and actuation paths on the cable pull of approximately 15 mm are present. If the master cylinder and the slave cylinder of the inventive solution of the same hydraulic surface are designed, a housing diameter of d _G = 21 mm would result for a piston diameter of d _K of 12 mm (effective diameter 14.5 mm) The actuation pressure could then be around 0.13 MPa (about 1.3 bar).

On a fluid exchange in a reservoir in the master cylinder, which is often referred to as sniffer function, can be dispensed with, if no loss of fluid takes place during operation, ergo no air can penetrate into the system, and due to temperature fluctuations, the hydraulic column no longer expands axially , All this is ensured in an embodiment according to the invention, in particular since no drag leakage occurs in diaphragm cylinders and the system is thereby hermetically decoupled from the environment.

By a favorable combination of the material of which the line and the cylinders are made and the working fluid, the axial extent of the hydraulic path is minimized.

In a tube with a coefficient of linear expansion α is a liquid with the volume expansion coefficient γ. With a temperature change ΔT of the tube of length L and the diameter d _R , its change in the volume content ΔV _R due to changes in length and cross-section is approximately: ΔV _R = π / 4 · L · d _R ² [(1 + α · ΔT) ³ 1]. The change of the liquid volume ΔV _Fl in the pipe is: ΔV _Fl = π / 4 * L * d _R ² * γ * ΔT.

There is no axial expansion of the fluid column due to temperature changes when:
ΔV _R = ΔV _Fl . If these equations are solved for γ, γ = [(1 + α · ΔT) ³ - 1] / ΔT.

To achieve this goal approximately, the material of which the pipe and the cylinder are made should have a high thermal expansion coefficient α. This would offer an unreinforced thermoplastic. For example, offers a polyamide, such as PA6-12. Here, α = 1.3 · 10 ^-4 · 1 / K. This results in the ideal case with a temperature change of 60 ° C, a volume expansion coefficient of the liquid of γ = 0.4 · 10 ^-3 · 1 / K.

The operating medium should therefore have a volume expansion coefficient γ of around 0.4 · 10 ^-3 · 1 / K at an operating temperature of up to -40 ° C. For this example, coolant would be suitable, such as water with a 50% antifreeze share. In the range of 20 ° C to -40 ° C, a γ value of 0.4 · 10 ^-3 · 1 / K would be set and in the range of 20 ° C to 80 ° C, a γ value of 0.6 · 10 ^-3 · 1 / K.

So it would be possible a release system with a cable length of 400 mm and a cable inside diameter of 3 mm. The inner diameter of the two cylinders is about 12 mm, with a piston diameter of about 8 mm and a stroke of about 16 mm. The following source shows, starting from the room temperature, the axial shortening or elongation in a cable pull system, a release system with a rolling diaphragm cylinder with a favorable and a rather unfavorable material-liquid combination: cable favorably designed hydraulic release system with rolling diaphragm cylinder unfavorable designed hydraulic release system with rolling diaphragm cylinder Material PA6-12 Liquid coolant Material steel Liquid brake fluid Coefficient of expansion. [1 / k] 0.17 · 10 ^-4 1.3 · 10 ^-4 0.4 × 10 ^-3 (20 ° C. → 40 ° C.) 0.6 × 10 ^-3 (20 ° C. → 80 ° C.) 0.13 · 10 ^-4 0.9 × 10 ^-3 Shortening (20 ° C → 40 ° C) 0,5mm 0.0mm 2,3mm Elongation (20 ° C → 80 ° C) 0,5mm 0,6mm 2,3mm Total (-40 ° C → 80 ° C 1,0mm 0,6mm 4,6mm

Over the entire temperature range, the low-priced hydraulic system even shows a smaller axial extent than a corresponding cable pull system. By reducing the inner diameter, the axial expansion due to temperature fluctuations could be further reduced.

An insert could also be possible with clutch release systems. There, by means of a favorable choice of materials and operating fluid, the axial extent of the hydraulic path due to temperature fluctuations can be significantly reduced. Benefits such as door handles and door locking systems are also present there.

As a replacement for cable systems thus a maintenance-free hydraulic tension system is provided, which has almost no friction and optimally uses the space. Problems, as they are known at tight Verlegeradien and existing friction between a rope and a guide tube, thereby avoided.

A particular embodiment could also be described by the fact that there is a rolling diaphragm in the housing, which acts sealingly between the housing and the piston. Here, the rolling diaphragm is attached to the outside of the housing and inside the piston. The piston is fixed to the environment and the housing is axially movable. The pipe opens into the piston. The housing leads past the piston to the connection for a pull rod or a pull rope. The housing supports the rolling diaphragm to the outside, which is why, especially at lower operating pressures, a reinforcement of the rolling diaphragm can be dispensed with. A reinforcement of the rolling membrane is otherwise probat. This allows in all cases smaller bending radii of the rolling diaphragm and thus a more compact design. If a spring is required, which biases the cylinder against the tensile force, this can also be accommodated in the cylinder.

The presented cylinder can be used both as a donor and slave cylinder. Pulling on the pull cable causes the housing to move in the direction of the piston. The piston dips into the housing and displaces the fluid through the line in the direction of the other cylinder. If the traction decreases, either the spring or a pulling force acting on the other cylinder forces the housing back into its original position.

On an exchange with a reservoir on the master cylinder, so the so-called. Sniffing function, can be omitted. The advantages of also referred to as bellows cylinder elements can be used extensively. For cost reasons, the entire system can be made of plastic. Plastic offers a relatively large coefficient of linear expansion of, for example, 1.5 · 10 ^-4 / K. If the liquid had a volume expansion coefficient of 0.3 · 10 ^-3 · 1 / K, the pipe walls with a length coefficient of 1.5 · 10 ^-4 · 1 / K would shrink or expand so much that the volume expansion of the liquid would increase Cross-sectional enlargement of the tube corresponds, so no axial expansion of the liquid column takes place.

Brake fluid has a volume expansion coefficient of 0.9 · 10 ^-3 · 1 / K, ie the hydraulic distance would be noticeably shortened or lengthened axially. Cooling water, such as a 50% water-glysantine mixture would have only a volume expansion coefficient of 0.5 · 10 ^-3 · 1 / K, which would significantly reduce the axial change of the liquid column, whereby a sniffer function would be dispensable.

It is also a variant possible in which the rolling diaphragm is mounted fixed in the axial direction on the housing, wherein the housing seals to the environment. On the housing a sleeve is fixed, on which the rolling diaphragm can roll. The sleeve supports the bellows in the radial direction. From the sleeve of the piston is guided. The piston contains rivets in which the housing moves axially. The pull rope is fixed to the piston. The housing supports the tensile force towards the environment.

The cylinder can then be used both as a donor and slave cylinder. Pulling on the pull cable causes the piston to move towards the housing, displacing the fluid through the pipe towards the other cylinder.

It is a hydraulic transmission system for forces with a master cylinder and a slave cylinder, a hydraulic route connecting them and a transfer fluid, the donor and the slave cylinder are listed as rolling diaphragm or these, proposed, it being emphasized that the materials of the Cylinder and a working fluid are matched to one another such that the axial extent of the hydraulic path is minimized due to temperature fluctuations.

This system is further developed by the fact that the master cylinder and the slave cylinder made of plastic, in particular PA6-12 and the transfer fluid is water with antifreeze.

Also, the system is further developed by the fact that the donor and / or the slave cylinder can be actuated by pulling force.

The invention will be explained in more detail below with the aid of a drawing in which three embodiments are shown. Show it:

1 a first hydraulic actuation system, in which the piston acts as an activating and adjusting resp.

2 a variant of the actuation system according to the invention 1 in which the piston is retained and the housing is displaced by tensile force relative to the piston and the housing acts as a reaction and movement triggering, and

3 a third embodiment, in which similar to the second embodiment according to 2 the piston is retained and the housing acting, but the rolling diaphragm is fixed only to the piston, unlike the second embodiment, wherein the rolling diaphragm is mounted on both the piston and the housing.

The figures are merely schematic in nature and are only for the understanding of the invention. The same elements are given the same reference numerals.

In 1 is a first embodiment of a hydraulic actuation system 1 shown. The hydraulic actuation system is designed for a motor vehicle, such as a car or a commercial vehicle, and can be used to lock doors or flaps to the chassis of the vehicle. But it can also be installed in a coupling system.

The hydraulic actuation system 1 has a first hydraulic cylinder 2 and a second hydraulic cylinder 3 on. Every hydraulic cylinder 2 or 3 has a housing 4 in which a piston 5 is located. The piston 5 is relative to the housing 4 arranged longitudinally movable. This is the piston 5 in a housing bore 6 and touches with a face 7 a central area 8th a membrane 9 namely a rolling membrane 10 , The rolling membrane 10 is in the in 1 illustrated embodiment designed as a sack and has at an open end 11 a circumferential bead 12 on. The bead 12 is in an annular groove 13 a housing-fixed housing closure 14 sealingly attached. At the housing closure 14 is a pipe / hydraulic line 15 connected and connects a pressure chamber 16 , in which about 130,000 Pa (about 1.3 bar) are present, with another pressure chamber 16 of the second hydraulic cylinder 3 , Each of the two pressure chambers 16 is doing through the rolling membrane 10 in the direction of the piston 5 limited.

In the hydraulic fluid line 15 is a hydraulic fluid 17 contained in the manner of a water-antifreeze mixture. The hydraulic fluid 17 Can also be used as hydraulic fluid 17 trained / designated. The piston 5 acts as a movement-triggering organ for a door opening or door locking unit. This door opening or door locking unit is not shown. The piston 5 of the first hydraulic cylinder 2 is operated with an actuator, which is not shown, such as a door handle, and into the interior of the housing 4 pushed, causing the pressure chamber 16 in the first hydraulic cylinder 2 is reduced and hydraulic fluid 17 in the pressure room 16 of the second hydraulic cylinder 3 is spent so that its piston 5 extends and at a door opening or door locking unit has a changing action.

While in the 1 the housing 2 the respective hydraulic cylinder 2 respectively. 3 is stationary, is in the embodiment of 2 and 3 The piston 5 stationary and the housing 4 connected with relative mobility.

Unlike in the embodiment according to 1 , is in the embodiment according to 2 the rolling membrane 10 not designed as a bag, but as a hose, with a first end 18 the rolling membrane 10 on the housing 4 is fixed and after a bending radius 19 a second end 20 the rolling membrane 10 on the piston 5 is fixed. For fixing the ends 18 and 20 each becomes a wire ring 21 used.

It is also a return policy 22 in the manner of a compression spring 23 contain. hydraulic fluid 17 is over the line 15 through the piston 5 and an extension pin 24 , which is formed hollow cylindrical, in the direction of a housing closure 14 spent and then via at least one outlet opening 25 in the respective pressure chamber 16 initiated. A drawbar / pull rope 26 causes a compression / reduction of the pressure chamber 16 and forces a reaction on the second hydraulic cylinder 2 ,

A support sleeve 27 is in the embodiment according to 3 additionally used. In this embodiment, the rolling diaphragm 10 again bag-shaped and an open end 11 on the piston 5 in a groove 13 sealingly attached.

In this case, the housing has 4 also a groove 28 on, through which a section of the piston 5 protrudes. A pull rope 26 engages in a plate 29 attached to the housing 4 connected is. Between the piston 5 and the housing 4 is the support sleeve 27 , outside to the rolling diaphragm 10 arranged.

The support sleeve 27 protrudes over the piston 5 in the direction of the plate 29 above.

The central section of the rolling membrane 10 can also be used as a central area 8th be designated.

LIST OF REFERENCE NUMBERS

1

 hydraulic actuation system

2

 first hydraulic cylinder

3

 second hydraulic cylinder

4

 casing

5

 piston

6

 housing bore

7

 face

8th

 central area

9

 membrane

10

 rolling diaphragm

11

 open end

12

 bead

13

 groove

14

 housing lock

15

 Line / hydraulic medium line

16

 pressure chamber

17

 hydraulic fluid

18

 first end of the rolling diaphragm

19

 bending radius

20

 second end of the rolling diaphragm

21

 wire ring

22

 Return means

23

 compression spring

24

 extension pin

25

 outlet opening

26

 Tongue / pull cable

27

 support sleeve

28

 groove

29

 plate

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

• US 3,400,962 [0003]
• DE 2908613 C2 [0003]
• DE 19949037 A1 [0004]
• US 2298776 [0005]
• US 4541258 [0005]
• DE 102004037299 A1 [0006]
• EP 0936102 A1 [0007]
• EP 1273744 A2 [0008]
• DE 10228978 B4 [0008]
• DE 8933547 U1 [0014]

Claims (10)

Hydraulic actuation system ( 1 ) for a motor vehicle, with a first hydraulic cylinder ( 2 ) and a second hydraulic cylinder ( 3 ), each with a housing ( 4 ) and a longitudinally movable piston ( 5 ), wherein the hydraulic cylinders ( 2 and 3 ) each have a hydraulic fluid ( 17 ) containing pressure space ( 16 ) and via a hydraulic medium line ( 15 ), which defines a hydraulic path, wherein the first hydraulic cylinder ( 2 ) can be brought into operative connection with an actuating member and the second hydraulic cylinder ( 3 ) can be brought into operative connection with an unlocking and / or locking device, such as a door opening or door locking unit, characterized in that the two hydraulic cylinders ( 2 . 3 ) The administration ( 15 ) and the hydraulic fluid ( 17 ) are made of such a material and such materials that an axial extent of the hydraulic path is minimized. Hydraulic actuation system ( 1 ) according to claim 1, characterized in that in the first hydraulic cylinder ( 2 ) and / or the second hydraulic cylinder ( 3 ) a rolling membrane ( 10 ) the pressure space ( 16 ) limited. Hydraulic actuation system ( 1 ) according to claim 1 or 2, characterized in that the housing ( 4 ) and / or the piston ( 5 ) of the first hydraulic cylinder ( 2 ) and / or the second hydraulic cylinder ( 3 ) made of plastic, such as polyamide, such as PA6-12. Hydraulic actuation system ( 1 ) according to one of claims 1 to 3, characterized in that as hydraulic fluid ( 17 ) a liquid, such as water with an antifreeze, a brake fluid or an oil in the two pressure chambers ( 16 ) and the hydraulic medium line ( 15 ) is included. Hydraulic actuation system ( 1 ) according to one of claims 1 to 4, characterized in that the piston ( 5 ) at least partially in the housing ( 4 ) is arranged. Hydraulic actuation system ( 1 ) according to one of claims 1 to 5, characterized in that the rolling diaphragm ( 10 ) sealed to a housing-fixed housing closure ( 14 ), the piston ( 5 ) and / or the housing ( 4 ). Hydraulic actuation system ( 1 ) according to one of claims 1 to 6, characterized in that the piston ( 5 ) protrudes through an approximately designed as a housing bore housing passage and / or from outside the pressure chamber ( 16 ) at a central portion ( 8th ) of the rolling membrane ( 10 ), wherein an open end ( 11 ) formed as a sack roll membrane ( 10 ) on a housing-fixed component, such as the housing closure ( 14 ) is sealingly attached, or a first end ( 18 ) of the rolling membrane ( 10 ), which is formed as a hose, on a housing-fixed component, such as the housing ( 4 ) itself, sealingly attached and a second end ( 20 ) of the rolling membrane ( 10 ) on the piston ( 5 ) is sealingly attached, or an open end ( 11 ) formed as a sack roll membrane ( 10 ) on a piston-fixed component, such as the piston ( 5 ) itself, sealingly attached. Hydraulic actuation system ( 1 ) according to one of claims 1 to 7, characterized in that between the rolling diaphragm ( 10 ) and the housing ( 4 ) a support sleeve ( 27 ), which in the radial direction supporting the rolling diaphragm ( 10 ) acts. Hydraulic actuation system ( 1 ) according to claim 8, characterized in that the support sleeve ( 27 ) with the piston ( 5 ) is coupled. Hydraulic actuation system ( 1 ) according to one of claims 1 to 9, characterized in that with the housing ( 4 ) a pull rod ( 26 ) or a pull rope ( 26 ) connected is.

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