DE102022105641A1 - Holding device for securing the position of a ring seal on a piston element of a slave device - Google Patents

Abstract

The invention relates to a holding device (1) for securing the position of at least one ring seal (55, 56) on a piston element (50) of a slave device (100), comprising: - a contact device (2) for contacting a first axial end (51) of a piston element ( 50) of a slave device (100), - wherein the contact device (2) comprises a contact surface (2A) which is oriented perpendicular to an axial direction (A) in which the holding device (1) rests on a piston element (50) of a slave device ( 100) can be pushed on, - a fastening device (3) for axially fixed fastening of the holding device (1) to a piston element (50) of a slave device (100), - a first and / or second stop device (4, 5) for securing the axial position of a Ring seal (55, 56) of a slave device (100) on its piston element (50), and - a first and/or second anti-torsion device (6, 7) for securing against torsion of an annular seal (55, 56) of a slave device (100), - wherein the first and/or second anti-torsion device (6, 7) extends away from the first and/or second stop device (4, 5) in the axial direction (A). The invention further relates to a piston element (50) for a slave device (100). for a hybrid or electric vehicle, a slave device (100) for a hybrid or electric vehicle and a drive arrangement (200) for a hybrid or electric vehicle.

Description

The invention relates to a holding device for securing the position of at least one ring seal on a piston element of a slave device, a piston element for a slave device, a slave device for a hybrid or electric vehicle and a drive arrangement for a hybrid or electric vehicle.

It is known from the prior art that so-called central slave cylinders (CSCs) are used both in hybrid drives and in electric vehicles and are used to separate an electric motor from the internal combustion engine or to change gears for an electric motor. Therefore, the perfect functionality of a central slave cylinder is very important in terms of its functional safety.

In 1 and 2 is a known slave device 100 or a known central release mechanism in a functional ( 1 ) and in a non-functional condition ( 2 ) shown. The receiving device 100, which can be designed for use in wet rooms, includes a housing 101 made of z. B. a polymer, a piston element 50, ring seals 55, 56 and a holding device 1.

As is known, the pressure build-up in the pressure chamber D moves the piston element 50 axially to the housing 101, which makes it possible to actuate a clutch device.

In the example according to the 1 and 2 a clutch device (not shown) is closed when the piston element 50 is disengaged. As soon as the clutch device is closed, full torque can be transmitted. During the pressure reduction, the piston element 50 moves back to the starting position and the coupling device is opened. This means that torque cannot be transmitted. The coupling device presses the piston element 50 back into the initial state.

In this context, the holding device 1 limits the axial movement of the two ring seals 55, 56 or the outer ring seal 55 and the inner ring seal 56. The holding device 1 thus serves to secure the position against axial displacement of the ring seals 55, 56 on the piston element 50 of the slave device 100 .

When the slave device 100 is actuated in combination with a coupling device that is inclined towards the axis of rotation D, high vibrations can occur, which are reflected as a wobbling movement in the piston element 50.

These wobbling movements place extreme stress on the ring seals 55, 56. In addition, when the piston element 50 wobbles, the gap between the ring seals 55, 56 and the housing 101 is increased. In the worst case scenario, this leads to a ring seal being twisted or twisted - see ring seal 56 in 2 .

Because of this, the twisted ring seal 56 can no longer function properly, which leads to a leak. A build-up of pressure in pressure chamber D is therefore no longer possible.

Against this background, it is the object of the present invention to provide a holding device for securing the position of at least one ring seal on a piston element of a slave device, a piston element for a slave device, a slave device and a drive arrangement for a hybrid or electric vehicle, which can be produced inexpensively and solves the problem shown above or prevents rotation of a ring seal.

This task is solved by the features of the independent patent claims. Further advantageous developments are the subject of the subclaims.

A first aspect of the present invention comprises a holding device for securing the position of at least one ring seal on a piston element of a slave device.

The holding device comprises a contact device for abutting against a first axial end of a piston element of a slave device, wherein the contact device comprises a contact surface. The contact surface is oriented perpendicular to an axial direction in which the holding device can be pushed onto a piston element of a slave device. The contact surface thus runs in the radial direction, so that a static sealing lip of a ring seal can abut against it in order to secure the axial position of the ring seal against displacement along a piston element of a slave device.

In the present description, the term perpendicular is understood to mean an angular range between 85 and 95 degrees, with said angular range being included between two directions or straight lines.

Furthermore, the holding device comprises a fastening device for axially fixed fastening Connection of the holding device to a piston element of a slave device. The fastening device is arranged on the contact device and extends in the axial direction away from the contact device.

In addition, the holding device has a first and/or second stop device for securing the axial position of an annular seal of a slave device on its piston element. The first and/or second stop device each comprises a stop surface which is aligned with the contact surface of the contact device.

The first stop device can be arranged on the fastening device and extend away from the fastening device in the radial direction or in the radial direction outwards.

In addition, it is possible for the second stop device to be arranged on the contact device and to extend in the radial direction away from the contact device or to extend inwards in the radial direction.

Furthermore, the holding device comprises a first and/or second anti-torsion device for securing against torsion of an annular seal of a slave device, wherein the first and/or second anti-torsion device extends away from the first and/or second stop device in the axial direction. The first and/or second anti-torsion device can extend in a direction away from the contact device. In addition, the first and/or second stop device can extend away from the contact device in the same direction as the fastening device. The first and/or second anti-torsion device forms a holding arm or a cantilever arm element which extends away from the first and/or second stop device and extends in the axial direction. With the aid of the first and/or second anti-torsion device, it is thus possible to intervene in a gap of an annular seal, which can be U-shaped in cross section, in order to at least partially encompass the annular seal and to prevent torsion or rotation about an axis , which is oriented perpendicular to the axial direction.

Furthermore, the first and/or second anti-torsion device can be designed to be hollow cylindrical. In this way, sufficient stability can be guaranteed.

Additionally or alternatively, the first and/or second anti-torsion device can have at least one cantilever arm element in a cross section parallel to the axial direction. A cantilever element serves to surround a ring seal or its static sealing lip together with the stop device and a piston element of a slave device, so that rotation or torsion of the ring seal is not possible.

Furthermore, a plurality of first anti-torsion devices can be arranged evenly distributed along the outer circumference of the first stop device. This saves weight and reduces the inertia of the holding device.

Additionally or alternatively, a plurality of second anti-torsion devices can be arranged equally distributed along the inner circumference of the second stop device. Here too, the formation of several anti-torsion devices saves weight and reduces the inertia of the holding device.

In addition, the first and/or second stop device and the first and/or second anti-torsion device can be arranged offset from one another, for example in the axial and/or radial direction. Differently shaped configurations can thus be formed, whereby the holding device can be used in existing slave devices without a slave device having to be structurally changed. The constructive offset of the individual devices in relation to one another makes it possible to take the installation space conditions of an existing holding device into account, so that the holding device can be tailored exactly to the needs in terms of installation space and geometry, for example. B. a piston element or a pressure chamber can be adapted to a slave device.

Additionally or alternatively, the contact device, the fastening device, the first and/or second stop device and/or the first and/or second anti-torsion device, e.g. B. in the axial and / or in the radial direction, be arranged offset from one another. It is precisely this that allows an even greater number of differently shaped configurations, whereby the holding device can be used even more easily in existing slave devices without having to structurally change a slave device. The constructive offset of the individual devices in relation to one another makes it possible to take the installation space conditions of an existing holding device into account, so that the holding device can be tailored exactly to the needs in terms of installation space and geometry, for example. B. a piston element or a pressure chamber can be adapted to a slave device.

In addition, the first and/or second anti-torsion device can connect to an end of the first and/or second stop device that is located on the outside in the radial direction.

Additionally or alternatively, the first and/or second anti-torsion device can connect to an end of the first and/or second stop device that is located on the inside in the radial direction.

In addition, the length of the first and/or second anti-torsion device can be adapted in the axial direction to the length of a static sealing lip of an annular seal of a slave device, so that the first and/or second anti-torsion device can be used to prevent torsion of an annular seal of a slave device on a piston element of a slave device about an axis can be prevented, which is aligned or oriented perpendicular to the axial direction.

The length of the first and/or second anti-torsion device in the axial direction can correspond to at least one fifth of the length of an annular seal of a slave device or its static sealing lip in the axial direction. This ensures sufficient coverage of a ring seal in the axial direction.

The height of the first and/or second stop device can be adapted in the radial direction to the height of a static sealing lip of an annular seal of a slave device. This makes it possible for the first and/or second stop device to position the first and/or second anti-torsion device so that it extends between a static and a dynamic sealing lip of an annular seal in order to prevent rotation or torsion of an annular seal.

Furthermore, the fastening device can connect the contact device to the first stop device. The fastening device can thus correctly position the first stop device in order to ensure axial abutment of an annular seal.

Additionally or alternatively, the second stop device can be arranged on the contact device.

The second stop device can move the contact device in the radial direction, for example in a straight line and z. B. also extend inwards in the radial direction.

In addition, the second stop device can move the contact device in the radial direction by at least the height of a static sealing lip of an annular seal of a slave device, for example. B. extend in the radial direction.

In addition, the contact device can be designed as an annular disk.

Furthermore, the fastening device can be designed as a hollow cylinder.

In addition, the fastening device can comprise at least one latching hook, which can be latched to a latching receptacle of a piston element of a slave device in order to limit movement in the axial direction.

The at least one locking hook can be shaped inwards in the radial direction in order to generate a force that is directed inwards in the radial direction. The at least one latching hook can also be located within a latching receptacle, e.g. B. designed as a groove, snapped or locked in a piston element of a slave device.

Furthermore, the first and/or second stop device can be designed as an annular disk. The second stop device can extend the contact device in the radial direction, so that the inner diameter of the contact device is reduced.

In principle, the holding device can be formed from a sheet of metal. The holding device can also be designed in one piece.

A second aspect of the present invention includes a piston element for a slave device, for example for a central clutch release, for a hybrid or electric vehicle.

It is expressly pointed out that the features of the holding device, as mentioned under the first aspect, can be used individually or in combination with one another in the piston element.

In other words, the features mentioned above under the first aspect of the invention regarding the holding device can also be combined with further features under the second aspect of the invention.

A piston element for a slave device or for a central clutch release for a hybrid or electric vehicle comprises a first axial end and a second axial end as well as a holding device according to the first aspect.

The holding device rests with its contact surface on the first axial end of the piston element.

In addition, the piston element can comprise a first and/or second shoulder for attaching an annular seal, so that a pressure chamber between the piston element and a housing of a slave device can be sealed.

In addition, the piston element can comprise an outer and/or inner ring seal for abutting against a housing of a slave device and for abutting against the piston element.

The outer and/or inner ring seal can be arranged on the first and/or second shoulder.

Each ring seal may include a static sealing lip which seals against the piston element.

Each ring seal can also include a dynamic sealing lip, which can seal against a housing of a slave device.

Each ring seal can be U-shaped, with the open side of the U-shape being aligned in the axial direction. In other words, the open side of the U-shape can be oriented towards the pressure chamber.

The piston element can be designed as an annular piston element.

Furthermore, the piston element can comprise a latching receptacle for at least one latching hook of the fastening device of the holding device in order to restrict or limit a movement of the holding device relative to the piston element in the axial direction.

The latching receptacle can be designed as a groove into which at least one latching hook of the fastening device of the holding device can engage in order to attach the holding device to the piston element in an axially fixed manner.

A third aspect of the present invention includes a pickup device for a hybrid or electric vehicle.

It is expressly pointed out that the features of the piston element, as mentioned under the second aspect, can be used individually or in combination with one another in the slave device.

In other words, the features relating to the piston element mentioned above under the second aspect of the invention can also be combined with further features here under the third aspect of the invention.

A slave device for a hybrid or electric vehicle includes a housing for forming part of a pressure chamber and a piston element according to the second aspect.

In this case, a complete pressure chamber can be formed in the interaction of the housing and the piston element, so that the piston element can be moved in the axial direction due to a pressurized fluid.

The housing can have an annular gap which is in fluid communication with the pressure chamber, wherein the annular gap can form a transition from an inlet chamber into the pressure chamber, so that a pressurized fluid can flow from the inlet chamber into the pressure chamber or from the pressure chamber into the inlet chamber to move the piston element of the slave device.

A fourth aspect of the present invention includes a drive arrangement for a hybrid or electric vehicle.

It is explicitly pointed out that the features of the slave device, as mentioned under the third aspect, can be used individually or in combination with one another in the drive arrangement.

In other words, the features mentioned above under the third aspect of the invention regarding the slave device can also be combined with further features here under the fourth aspect of the invention.

A drive arrangement for a hybrid or electric vehicle includes a drive housing to form part of an inlet chamber and a slave device according to the third aspect.

In this case, a complete inlet chamber can be formed in the interaction of the drive housing and the housing of the slave device, so that a pressurized fluid can flow from the inlet chamber into the pressure chamber or drain from the pressure chamber into the inlet chamber in order to move the piston element of the slave device.

Below, the inventive idea presented above is expressed again and additionally in other words.

This idea concerns - presented in simple terms - a holding device which arranges a torsion of groove sealing rings or ring seals net on a piston element of a slave device, prevented.

In order to save installation space and costs, a known holding device or a known sheet metal holding ring can be optimized. To do this, additional material can be bent at both ends of the holding device in the direction of ring seals. This creates two additional supports or anti-torsion devices that prevent the ring seals from possible torsion.

To do this, an existing sheet metal for a holding device can be enlarged a little. The additional material at both ends of the holding device can be bent towards ring seals in a punching and forming process. This creates two additional anti-torsion devices or supports or support arms, which additionally protect a ring seal from torsion.

The holding device or the sheet metal holding ring can be mounted on the piston element of a slave device and fixed by means of holding lugs or by means of a fastening device that can engage in the piston element. The support arms or the anti-torsion devices can reach into the space between a static and a dynamic sealing lip of a ring seal. This means that ring seals can neither move axially on the piston element nor twist.

• 1 eine Schnittansicht auf eine Nehmervorrichtung aus dem Stand der Technik;
• 2 eine Schnittansicht auf eine Nehmervorrichtung aus dem Stand der Technik mit einer tordierten Ringdichtung;
• 3 eine Schnittansicht auf eine Nehmervorrichtung; und
• 4 eine Schnittansicht auf eine Antriebsanordnung mit der Nehmervorrichtung aus 3.

The invention is explained in more detail below using an exemplary embodiment in conjunction with associated drawings. Show schematically:

• 1 a sectional view of a pickup device from the prior art;
• 2 a sectional view of a prior art slave device with a twisted ring seal;
• 3 a sectional view of a receiving device; and
• 4 a sectional view of a drive arrangement with the slave device 3 .

In the following description, the same reference numbers are used for the same objects.

Concerning the 1 and 2 Reference is made to the statements at the beginning of the description, so that further explanations are foreseeable at this point.

3 shows a sectional view of a receiver device 100.

Described in more detail shows 3 a slave device 100 for a hybrid or electric vehicle with a housing 101 to form part of a pressure chamber D.

Here, the slave device 100 has a piston element 50, which will be described in more detail. In the interaction of the housing 101 and the piston element 50, a complete pressure chamber D can be formed, so that the piston element 50 can be moved in the axial direction A due to a pressurized fluid.

The housing 101 has an annular gap 102, which is in fluid communication with the pressure chamber D, the annular gap 102 forming a transition from an inlet chamber Z into the pressure chamber D. A pressurized fluid can thus flow from the inlet chamber Z into the pressure chamber D or from the pressure chamber D into the inlet chamber Z in order to move the piston element 50 of the slave device 100.

In 3 A holding device 1 for securing the position of two ring seals 55, 56 on the piston element 50 of the slave device 100 is also shown.

The holding device 1 has a contact device 2 for abutting against a first axial end 51 of the piston element 50 of the slave device 100, the contact device 2 comprising a contact surface 2A. The contact surface 2A is oriented perpendicular to an axial direction A, in which the holding device 1 can be pushed onto the piston element 50 of the slave device 100.

Also shows 3 that the holding device 1 has a fastening device 3 for axially fixed fastening of the holding device 1 to the piston element 50 of the slave device 100. The fastening device 3 is arranged on the contact device 2 and extends in the axial direction A away from the contact device 2.

In addition, the holding device 1 has a first and a second stop device 4, 5 for securing the axial position of ring seals 55, 56 of the slave device 100 on its piston element 50.

The first and second stop devices 4, 5 each comprise a stop surface 4A, 5A, which is aligned with the contact surface 2A of the contact device 2.

Also goes out 3 shows that the first stop device 4 is arranged on the fastening device 3 and extends away from the fastening device 3 in the radial direction R.

The second stop device 5 is according to 3 arranged on the contact device 2 and extends in the radial direction R away from the contact device 2 or in the radial direction R inwards.

Furthermore shows 3 that the holding device 1 comprises a first and second anti-torsion device 6, 7 for securing against torsion of ring seals 55, 56 of the slave device 100. The first and second anti-torsion devices 6, 7 extend away from the first and second stop devices 4, 5 in the axial direction A. Strictly speaking, the first and second stop devices 4, 5 extend in the same direction away from the contact device 2 as the fastening device 3.

As in 3 Also shown, both the first and second anti-torsion devices 6, 7 are hollow cylindrical, with both anti-torsion devices 6, 7 having a plurality of cantilever elements in a cross section parallel to the axial direction A.

Described in more detail, a plurality of first anti-torsion devices 6 are arranged equally distributed along the outer circumference of the first stop device 4 and a plurality of second anti-torsion devices 7 are arranged equally distributed along the inner circumference of the second stop device 5.

Furthermore shows 3 that the first and second stop devices 4, 5 and the first and second anti-torsion devices 6, 7 are arranged offset from one another in the axial and radial directions A, R.

Also shows 3 that the first anti-torsion device 6 connects to an end of the first stop device 4 that is located on the outside in the radial direction R.

Furthermore, the second anti-torsion device 7 adjoins an inner end of the second stop device 5 in the radial direction R.

Also is according to 3 the length of the first and second anti-torsion devices 6, 7 in the axial direction A is adapted to the length of static sealing lips 55A, 56A of ring seals 55, 56 of the slave device 100, so that the first and second anti-torsion devices 6, 7 prevent torsion of an annular seal 55, 56 of the slave device 100 on the piston element 50 of the slave device 100 can be prevented about an axis that is aligned or oriented perpendicular to the axial direction A.

The length of the first and second anti-torsion devices 6, 7 corresponds to as in 3 shown, in the axial direction A a third of the length of an annular seal 55, 56 of the slave device 100.

Furthermore goes out 3 shows that the height of the first and second stop devices 4, 5 in the radial direction R is adapted to the height of a static sealing lip 55A, 56A of an annular seal 55, 56 of the slave device 100.

Also shows 3 that the fastening device 3 connects the contact device 2 to the first stop device 4, and that the second stop device 5 is arranged on the contact device 2.

The second stop device 5 extends the contact device 2 in the radial direction R, to be precise in a straight line or in the radial direction R inwards. Described even more specifically, the second stop device 5 extends the contact device 2 in the radial direction R by at least the height of a static sealing lip 55A, 56A of an annular seal 55, 56 of the slave device 100.

How out 3 Also shows, the contact device 2 is designed as an annular disk, with the fastening device 3 being designed as a hollow cylinder.

The fastening device 3 has various locking hooks 3A, which can be locked with a locking receptacle 57 of the piston element 50 of the slave device 100 in order to restrict movement of the holding device 1 in the axial direction A. So shows 3 that the locking hooks 3A are shaped inwards in the radial direction R in order to generate a force that is directed inwards in the radial direction R. Strictly speaking, the locking hooks 3A snap into place within a locking receptacle 57, designed as a groove, in the piston element 50 of the slave device 100.

Furthermore shows 3 that the first and second stop devices 4, 5 are designed as an annular disk, the second stop device 5 - as already mentioned - extending the contact device 2 in the radial direction R, so that the inner diameter of the contact device 2 is reduced.

The holding device 1 is formed from a sheet metal and is formed in one piece.

As mentioned at the beginning, the slave device 100 has a piston element 50.

Specifically described shows 3 a piston element 50 for a slave device 100 or for a central clutch release for a hybrid or electric vehicle.

The piston element 50 has a first axial end 51 and a second axial end 52. The holding device 1 rests with its contact surface 2A on the first axial end 51 of the piston element 50.

Furthermore shows 3 that the piston element 50 comprises a first and second shoulder 53, 54 each for attaching an annular seal 55, 56, so that a pressure chamber D between the piston element 50 and the housing 101 of the slave device 100 can be sealed.

Furthermore, the piston element 50 has an outer and an inner ring seal 55, 56 for abutting against a housing 101 of a slave device 100 and for abutting against the piston element 50.

The outer and inner ring seals 55, 56 are arranged on the first and second shoulders 53, 54, respectively.

According to 3 each ring seal 55, 56 has a static sealing lip 55A, 56A which seals against the piston element 50. Furthermore, each ring seal 55, 56 has a dynamic sealing lip 55B, 56B, which seals against the housing 101 of the slave device 100. Furthermore, each ring seal 55, 56 is U-shaped, with the open side of the U-shape being aligned in the axial direction A. In other words, the open side of the U-shape is oriented towards the pressure space D.

Furthermore shows 3 that the piston element 50 includes a latching receptacle 57 for latching hooks 3A of the fastening device 3 in order to restrict or limit a movement of the holding device 1 relative to the piston element 50 in the axial direction A.

The locking receptacle 57 is designed as a groove into which the locking hooks 3A of the fastening device 3 engage in order to attach the holding device 1 to the piston element 50 in an axially fixed manner or to prevent movement in the axial direction A.

Further is 3 it can be seen that the piston element 50 is designed as an annular piston element.

4 shows a sectional view of a drive arrangement 200 with the slave device 100 3 .

The drive arrangement 200 for a hybrid or electric vehicle has a drive housing 201 to form part of an inlet chamber Z and a slave device 100.

Due to the fact that the slave device 100 after 4 highly similar to the slave device 100 3 is, a further description of the slave device 100 is omitted and instead the description follows 3 referred.

Also shows 4 that in the interaction of the drive housing 201 and the housing 101 of the slave device 100, a complete inlet chamber Z is formed, so that a pressurized fluid can flow from the inlet chamber Z into the pressure chamber D or from the pressure chamber D into the inlet chamber Z, in order to achieve this Piston element 50 of the slave device 100 to move.

Reference symbol list

1

Holding device

2

Contact facility

2A

investment area

3

Fastening device

3A

Latching hook

4

first stop device

4A

stop surface

5

second stop device

5A

stop surface

6

first anti-torsion device

7

second anti-torsion device

50

Piston element

51

first axial end

52

second axial end

53

first paragraph

54

second paragraph

55

Ring seal

55A

static sealing lip

55B

dynamic sealing lip

56

Ring seal

56A

static sealing lip

56B

dynamic sealing lip

57

snap-in recording

100

slave device

101

Housing

102

Annular gap

200

Drive arrangement

201

Drive housing

A

axial direction

R

radial direction

D

Pressure chamber

Z

Inlet chamber

Claims (10)

Holding device (1) for securing the position of at least one ring seal (55, 56) on a piston element (50) of a slave device (100), comprising: - a contact device (2) for abutting against a first axial end (51) of a piston element (50) of a slave device (100), - wherein the contact device (2) comprises a contact surface (2A) which is oriented perpendicular to an axial direction (A), in which the holding device (1) can be pushed onto a piston element (50) of a slave device (100). , - a fastening device (3) for axially fixed fastening of the holding device (1) to a piston element (50) of a slave device (100), - the fastening device (3) is arranged on the contact device (2) and is in the axial direction (A) extends away from the contact device (2), and - a first and/or second stop device (4, 5) for securing the axial position of an annular seal (55, 56) of a slave device (100) on its piston element (50), - the first and/or second stop device (4, 5) each comprises a stop surface (4A, 5A) which is aligned with the contact surface (2A) of the contact device (2), characterized in that - the holding device (1) has a first and/or second anti-torsion device (6, 7) for securing against torsion of an annular seal (55, 56) of a slave device (100), - wherein the first and / or second anti-torsion device (6, 7) is separated from the first and / or second stop device (4 , 5) extends in the axial direction (A). holding device Claim 1 , - wherein the first and / or second anti-torsion device (6, 7) is hollow cylindrical, and / or - wherein the first and / or second anti-torsion device (6, 7) has at least one cantilever element in a cross section parallel to the axial direction (A). . holding device Claim 1 or 2 , - wherein a plurality of first anti-torsion devices (6) are arranged equally distributed along the outer circumference of the first stop device (4), and / or - wherein a plurality of second anti-torsion devices (7) are arranged equally distributed along the inner circumference of the second stop device (5). is. Holding device according to one of the preceding claims, - wherein the first and/or second anti-torsion device (6, 7) adjoins an end of the first and/or second stop device (4, 5) that is external in the radial direction (R), and/or - Wherein the first and/or second anti-torsion device (6, 7) adjoins an end of the first and/or second stop device (4, 5) which is on the inside in the radial direction (R). Holding device according to one of the preceding claims, - wherein the fastening device (3) connects the contact device (2) to the first stop device (4), and/or - wherein the second stop device (5) is arranged on the contact device (2), and - Wherein the second stop device (5) extends the contact device (2) in the radial direction (R). Holding device according to one of the preceding claims, - wherein the contact device (2) is designed as an annular disk, - wherein the fastening device (3) is designed as a hollow cylinder, - wherein the fastening device (3) comprises at least one latching hook (3A) which can be latched to a latching receptacle (57) of a piston element (50) of a slave device (100) in order to restrict movement in the axial direction (A), and - wherein the first and/or second stop device (4, 5) is designed as an annular disk. Piston element (50) for a slave device (100) for a hybrid or electric vehicle, comprising: - a first axial end (51) and a second axial end (52), and - a holding device (1) according to one of the preceding claims, - wherein the holding device (1) with its contact surface (2A) on the first axial end (51 ) of the piston element (50). Piston element after Claim 7 , - wherein the piston element (50) comprises an outer and / or inner ring seal (55, 56) for abutting against a housing (101) of a slave device (100) and for abutting against the piston element (50), - each annular seal (55 , 56) comprises a static sealing lip (55A, 56A) which seals against the piston element (50), - each ring seal (55, 56) comprising a dynamic sealing lip (55B, 56B) which seals against a housing (101). Receiver device (100) can rest tightly. A slave device (100) for a hybrid or electric vehicle, comprising: - a housing (101) for forming part of a pressure chamber (D), - a piston element (50) according to one of Claims 7 or 8th , - wherein in the interaction of the housing (101) and the piston element (50) a complete pressure chamber (D) can be formed, so that the piston element (50) can be moved in the axial direction (A) due to a pressurized fluid. Drive arrangement (200) for a hybrid or electric vehicle, comprising: - a drive housing (201) for forming part of an inlet chamber (Z), - a slave device (100). Claim 9 , - whereby in the interaction of the drive housing (201) and the housing (101) of the slave device (100), a complete inlet chamber (Z) can be formed, so that a pressurized fluid flows from the inlet chamber (Z) into the pressure chamber (D). can drain from the pressure chamber (D) into the inlet chamber (Z) in order to move the piston element (50) of the slave device (100).

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