DE102022133448B4 - Slave cylinder with pre-assembled sealing disc - Google Patents

Abstract

A slave cylinder 1 for actuating a clutch device is proposed, with a cylinder housing 2 which can be fastened to a housing section 28 and which defines a longitudinal axis 100, with at least one piston 3 which is accommodated in the cylinder housing 2 so as to be displaceable coaxially with respect to the longitudinal axis 100, with at least one pressure chamber which can be filled with an operating medium and which is formed between the piston 3 and the cylinder housing 2, wherein the cylinder housing 2 has at least one pressure connection opening 4 for connecting the pressure chamber to a hydraulic system, wherein a sealing disk 6 arranged coaxially with respect to the longitudinal axis 100 for sealing the at least one pressure connection opening 4 with respect to the housing section 28, wherein the pressure connection opening 4 is arranged on an axial end face of the cylinder housing 2 and the cylinder housing 2 has a fastening geometry 13 on the axial end face, on which the sealing disk 6 is held captively at least axially with respect to the longitudinal axis 100.

Description

The invention relates to a slave cylinder for actuating a clutch device with the features of the preamble of claim 1. Furthermore, the invention relates to a pre-assembly unit with the slave cylinder and a method for assembling the slave cylinder and/or the pre-assembly unit.

Clutches for engaging and disengaging an electric machine in a drive train of a motor vehicle are known. To open and close the clutch, a clutch slave cylinder is required, which has a housing with a pressure chamber in which an axially displaceable piston is guided. The housing of the clutch slave cylinder is in turn attached to a housing of the clutch arrangement.

The publication DE 197 55 494 A1 discloses a release device for a hydraulically operated friction clutch of vehicles, comprising a slave cylinder with a pressure housing that concentrically encloses a drive shaft, in which an annular piston that can be acted upon by a pressure medium is slidably guided, on the end of which a release bearing supported on the friction clutch is arranged, wherein the pressure housing is detachably screwed to a transmission housing and is provided with fastening sleeves or fastening eyes arranged around the circumference, the bore of which serves to receive a fastening screw that can be screwed into an associated threaded bore in the transmission housing. Each fastening screw has a retaining device and the pressure housing is provided with a wall that runs coaxially to the drive shaft and encloses the release bearing when it is in a neutral position, wherein the fastening screw is preferably guided with the screw head on the wall, which simultaneously serves to receive the retaining device.

From the EN 10 2010 053 945 A1 a slave cylinder according to the preamble of claim 1 is known. Further prior art is described in EN 10 2021 109 034 A1 the EN 10 2007 047 514 A1 and the EN 10 2012 208 750 A1 disclosed.

It is an object of the present invention to propose a slave cylinder which is characterized by a particularly simple and compact attachment to the housing.

This object is achieved by a slave cylinder with the features of claim 1, a pre-assembly unit with the features of claim 8 and a method with the features of claim 9. Preferred or advantageous embodiments of the invention emerge from the subclaims, the following description and the attached figures.

The subject matter of the invention is a slave cylinder which is designed and/or suitable for actuating a clutch device, in particular a friction or claw clutch. The clutch device can be a separating clutch (K0) or a double clutch (K1/K2) of an electric or hybridized drive train. Alternatively, however, the slave cylinder can also be designed and/or suitable for actuating a braking device, in particular a drag brake. The slave cylinder is preferably hydraulically actuated. The slave cylinder is particularly preferably designed as a concentric slave cylinder, also known as a “concentric slave cylinder (CSC)”. In particular, the concentric slave cylinder is designed as a central releaser.

The slave cylinder has a cylinder housing that can be attached to a housing section and that defines a longitudinal axis. In particular, the cylinder housing is to be understood as a hollow cylindrical and/or ring-shaped housing that is arranged coaxially to the longitudinal axis. The cylinder housing is particularly preferably designed as a ring housing that extends concentrically around the longitudinal axis. The ring housing preferably has a central through-opening, in particular a bore, through which a shaft, for example a transmission shaft of a transmission, can be guided when the slave cylinder is installed.

Preferably, the housing section forms an integral part of a clutch housing, which is designed and/or suitable for receiving the clutch device and the slave cylinder. In particular, the clutch housing has a housing space, in particular a wet space, in which the clutch device and the slave cylinder are arranged. The housing space is preferably delimited in the axial direction with respect to the longitudinal axis by a housing wall (partition wall), wherein in particular the housing section is designed as the housing wall.

The slave cylinder has at least or exactly one piston, which is accommodated in the housing so as to be movable coaxially and/or concentrically with respect to the longitudinal axis. In particular, the piston serves to transmit a hydraulic actuating force to the clutch device. For this purpose, the piston is preferably in operative connection with the clutch device. connection. The actuating force is particularly preferably understood as a pressure force directed axially with respect to the longitudinal axis. The piston is preferably displaceable in the axial direction with respect to the longitudinal axis between a basic position and an actuating position in the cylinder housing. In particular, when the slave cylinder is actuated, the piston is displaced axially from the basic position to the actuating position. The piston is particularly preferably designed as an annular piston.

The slave cylinder has a pressure chamber that can be filled with an operating medium and is formed between the piston and the cylinder housing. In particular, the pressure chamber is delimited in the axial direction with respect to the longitudinal axis by the piston and in the radial direction by at least or exactly one cylinder jacket surface of the cylinder housing. The pressure chamber is preferably formed by a cylinder chamber, preferably an annular chamber, which is open on one side in the axial direction delimited by the piston. When the slave cylinder is actuated, the pressure on the operating medium is increased, with the actuating force being generated due to the increasing pressure in the pressure chamber and being transferred to the piston so that it is moved axially, in particular from the basic position into the actuating position.

The cylinder housing has at least or exactly one pressure connection opening, which is designed and/or suitable for hydraulically connecting the pressure chamber to a hydraulic system. In particular, an operating medium, in particular a fluid, can be fed into the pressure chamber via the pressure connection opening. For example, the hydraulic system can have a master cylinder and/or a hydraulic pump to change the fluid pressure. In particular, the operating medium is a hydraulic fluid, in particular a hydraulic oil. Particularly preferably, the pressure chamber is fluidly connected to a pressure connection formed on the housing section via the pressure connection opening.

Optionally, the slave cylinder has a further piston and a further pressure chamber that can be filled with the operating medium, the cylinder housing having a further pressure connection opening for separately connecting the pressure chamber to the hydraulic system. The piston and the further piston are preferably designed as two ring pistons arranged concentrically to one another with respect to the longitudinal axis. It is particularly preferred that the two pistons can be actuated independently of one another. For this purpose, the two pressure chambers are fluidically separated from one another, the pressure chamber being connected to a first hydraulic circuit via the pressure connection opening and the further pressure chamber being connected to a second hydraulic circuit of the hydraulic system via the further pressure connection opening.

Within the scope of the invention, it is proposed that the slave cylinder has a sealing disk arranged coaxially to the longitudinal axis, which is designed and/or suitable for sealing the one pressure connection opening and possibly the further pressure connection opening relative to the housing section. For this purpose, the pressure connection opening and possibly the further pressure connection opening is/are introduced on an axial end face of the cylinder housing, wherein the sealing disk is held captively in the axial direction with respect to the longitudinal axis on a fastening geometry formed on the axial end face of the cylinder housing. In particular, in a proper installation situation of the slave cylinder, the sealing disk forms a contact seal between the slave cylinder and the housing section. In other words, in the proper installation situation, the sealing disk rests on the cylinder housing on the one hand, in particular in an axial direction with respect to the longitudinal axis, and on the other hand, in particular in an axial opposite direction with respect to the longitudinal axis, on the housing section. In particular, the at least one pressure connection opening and possibly the further pressure connection opening are formed by one or more arc-shaped openings extending in the circumferential direction. Preferably, the sealing disc is mounted and/or mountable in a self-retaining manner in the circumferential direction in at least or exactly one specified orientation on the fastening geometry.

The invention is based on the knowledge that when assembling the slave cylinder, several parts have to be assembled one after the other on the housing section of the slave cylinder. For this purpose, pre-assembly of the components of the slave cylinder is advantageous so that it can be mounted on the housing section as a pre-assembled unit. The integration of the pressure connection opening on the front side enables a particularly simple hydraulic connection, while at the same time the fastening geometry enables a simple pre-assembly of the sealing disk on the cylinder housing in order to pre-position it in the correct position relative to the pressure connection opening(s). A slave cylinder is therefore proposed which is characterized by a particularly simple and compact fastening.

In a specific embodiment, it is provided that the sealing disc is held in a force-fitting manner in the axial direction on the fastening geometry, whereby a holding force (static friction) of at least is greater than the weight of the sealing disc. In other words, the sealing disc is mounted and/or mountable in a self-retaining manner on the fastening geometry via a frictional connection. In particular, the sealing disc can be pressed onto the fastening geometry in the axial direction. For this purpose, the fastening geometry is preferably aligned axially in relation to the longitudinal axis. In particular, the sealing disc is held in the correct position on the cylinder housing during assembly, so that the slave cylinder can be mounted particularly easily on the housing section.

According to the invention, the sealing disc has an annular disc, at least one elastic sealing ring and at least one elastic fastening ring. The annular disc has at least one pressure connection opening covering the pressure connection opening, in which the sealing ring is arranged for the all-round sealing of the pressure connection opening. The annular disc also has a fastening opening which accommodates the fastening geometry and in which the fastening ring is arranged for contact with the fastening geometry. In simple terms, the sealing ring is used for the all-round, fluid-tight sealing of the pressure connection opening and the fastening ring is used for the captive, in particular force-locking, fastening of the annular disc. For the fluid-tight sealing, the sealing ring preferably lies all around or around the pressure connection opening on the front side of the cylinder housing in a sealing manner. The fastening ring preferably lies frictionally against the fastening geometry for the captive fastening of the annular disc. In particular, the fastening ring is elastically deformable to generate the holding force during assembly. The at least one sealing ring and/or the at least one fastening ring are preferably held in the respective opening in a material-locking manner, e.g. by injection molding. Alternatively, the at least one sealing ring and/or the at least one fastening ring can also be designed as separate components and held in the respective opening in a form-fitting and/or force-locking manner. For example, the ring disk is made from a metal sheet, preferably sheet steel. For example, the sealing ring and the fastening ring are made from an elastomer, preferably rubber. The ring disk has the particular function of holding the sealing ring in the pre-assembled state in the correct position relative to the pressure connection opening, so that the assembly reliability during assembly is significantly increased. In other words, the ring disk serves as a positioning aid for the sealing ring in the pre-assembled state.

Optionally, the ring disk additionally has a further pressure connection opening covering the further pressure connection opening, in which a further sealing ring is arranged for the circumferential sealing of the further pressure connection opening. In particular, the pressure connection opening is arranged congruently and/or flush with the pressure connection opening and, if necessary, the further pressure connection opening is arranged congruently and/or flush with the further pressure connection opening.

In a specific embodiment, the ring disk is mounted in a floating manner relative to the cylinder housing via the sealing mold ring and the fastening mold ring in the axial direction with an axial movement clearance. In particular, the ring disk is supported on the cylinder housing exclusively via the elastic mold rings. The floating mounting preferably ensures a small axial mobility of the ring disk. In particular, a floating fixation of the sealing disk is necessary in order to be able to mount the slave cylinder lying on the housing section.

In a specific development, it is provided that the fastening ring has at least one elastically deformable frictional connection contour on its inner circumference, via which the fastening ring is supported in a frictional manner on the fastening geometry. In particular, the frictional connection contour can be elastically preformed and/or deformed when the sealing disc is assembled. The elastic deformation described achieves a frictional connection or frictional connection between the sealing disc and the cylinder housing. The frictional connection contour is particularly preferably formed by a radially inwardly projecting elevation, such as a knob, nose, rib or the like. The fastening ring preferably has more than three, preferably exactly four of the elevations. The frictional connection contour can ensure a particularly secure hold of the sealing disc.

In a further specific implementation, it is provided that at least the at least one sealing ring has an axial support surface on both sides for axial support on the cylinder housing and the housing section. In particular, the sealing ring is supported and/or can be supported in the axial direction with one support surface on the slave cylinder and in the axial opposite direction with the other support surface on the housing section. Preferably, the support surfaces each define a sealing surface over which the sealing ring seals. In particular, the two support surfaces each extend in a radial plane of the longitudinal axis.

Optionally, it is additionally provided that the fastening ring has a further axial support surface on both sides for axial support on the cylinder housing and the housing section. In other words, the sealing disc is supported and/or can be supported in the axial direction on the cylinder housing and in the axial opposite direction on the housing section via a support surface of the at least one sealing ring and a support surface of the at least one fastening ring. Particularly preferably, the support surfaces of the fastening ring and the sealing ring extend on both sides in a common radial plane, so that when the sealing disc rests on the cylinder housing or the housing section, a constant distance is formed between the ring disc and the cylinder housing or the housing section. This ensures a particularly stable, floating position of the sealing disc and thus a secure seal of the flow opening.

In a further implementation, it is provided that the sealing disc has at least or exactly one elastic spacer element for axial support on the cylinder housing and/or the housing section. In particular, the spacer element serves to ensure a constant distance between the ring disk and the housing or the housing section when the sealing ring is in contact. The at least one spacer element can be fixed to the ring disk in a form-fitting and/or force-fitting and/or material-fitting manner. In particular, the at least one spacer element has a further support surface on both sides, which each extend in a common radial plane of the support surfaces of the sealing ring and possibly the fastening ring. In particular, the sealing disc has more than two, preferably more than four, in particular more than six of the spacer elements, which are arranged spaced apart in the circumferential direction and/or opposite the sealing ring and/or the fastening ring. For example, the at least one spacer element is made of an elastomer, preferably rubber. For example, the spacer element is designed as a rubber stud, rubber rib or the like. The spacer element enables the sealing disc to be particularly stable on the cylinder housing or the housing section, while at the same time ensuring that the ring disc is supported in a floating manner in the axial direction in relation to the longitudinal axis.

In a specific implementation, it is provided that the at least one fastening geometry is formed by at least or exactly one fastening contour. Preferably, the fastening contour serves exclusively for fastening the sealing disc to the cylinder housing. Preferably, the fastening contour is formed in the axial direction with respect to the longitudinal axis directly on the axial front side of the cylinder housing. The fastening contour can be formed by a pin, tenon, nose or the like. Preferably, the fastening geometry is formed by at least two of the fastening contours, which are aligned in the axial direction with respect to the longitudinal axis and arranged opposite one another in the circumferential direction.

Alternatively or optionally in addition, the fastening geometry is formed by at least one or exactly one centering contour. The centering contour is preferably used to center the slave cylinder on the housing section. The centering contour is preferably formed in the axial direction in relation to the longitudinal axis directly on the axial front side of the cylinder housing. The centering contour can be formed by a pin, mandrel, bolt or the like. In particular, the housing section preferably has a centering receptacle into which the centering mandrel engages in a form-fitting manner, in particular in the circumferential direction, when the slave cylinder is in the assembled state.

Alternatively or optionally in addition, the fastening geometry is formed by at least one anti-twisting contour of the cylinder housing. The anti-twisting contour preferably serves to secure the slave cylinder to the housing section in a rotationally fixed manner. The anti-twisting contour is preferably formed directly on the axial end face of the cylinder housing in the axial direction with respect to the longitudinal axis. The anti-twisting contour can be formed by a bolt, cylinder, pipe section or the like. The fastening geometry is preferably formed by at least two of the anti-twisting contours, which are aligned in the axial direction with respect to the longitudinal axis and arranged adjacent to one another in the circumferential direction. In particular, the housing section has an anti-twisting receptacle into which the anti-twisting contour engages in a form-fitting manner at least in the circumferential direction in order to prevent the slave cylinder from rotating about the longitudinal axis.

Accordingly, the ring disk can have several fastening openings, in each of which a fastening mold ring is arranged. In particular, at least one of the fastening openings is designed to accommodate the fastening contour and/or one of the fastening openings is designed to accommodate the centering contour and/or one of the fastening openings is designed to accommodate the anti-twist contour. A cylinder housing is thus proposed which characterized by a particularly simple design and easy installation of the sealing disc.

A further subject of the invention relates to a pre-assembly unit for a clutch arrangement, with the housing section and with the slave cylinder, as already described above. In particular, the clutch arrangement is designed and/or suitable for a drive train of a vehicle, preferably an electric axle. In particular, the clutch arrangement serves to interrupt and/or redirect a torque path of the drive train. The clutch arrangement preferably serves to engage and disengage an electric machine. For this purpose, the clutch arrangement has the clutch device, which can be actuated by the slave cylinder.

The housing section has at least or exactly one pressure connection complementary to the pressure connection opening, wherein the slave cylinder is supported in the axial direction in relation to the longitudinal axis via the sealing disk on the housing section in order to seal the pressure connection opening all the way around with respect to the pressure connection. In particular, the pressure connection is fluidically connected to the pressure connection opening via the pressure connection opening of the sealing disk. Particularly preferably, the at least one sealing ring is in sealing contact with the cylinder housing and the housing section in such a way that the pressure connection opening and the pressure connection open within the sealing ring or the pressure connection opening. In particular, the housing section has two pressure connections that are fluidically separated from one another, wherein one pressure connection is fluidically connected to the pressure connection opening via the sealing ring and the other pressure connection is fluidically connected to the further pressure connection opening via the further sealing ring. The slave cylinder is particularly preferably secured to the housing section via a plurality of fastening means, wherein the sealing disk is clamped between the cylinder housing and the housing section with a fastening force applied via the fastening means. In particular, the sealing disk is axially supported on the cylinder housing and the housing section via the at least one fastening ring and/or the at least one spacer element. In simplified terms, the pre-assembly unit is to be understood as a pre-assembled structural unit which is or will be formed by pre-assembling the slave cylinder on the housing section.

• - der Nehmerzylinder vormontiert wird, wobei in einem Vormontageschritt die Dichtscheibe an der Befestigungsgeometrie des Zylindergehäuses verliersicher montiert wird;
• - der Nehmerzylinder als vormontierte Baueinheit in einem weiteren Vormontageschritt axial an dem Gehäuseabschnitt befestigt wird.

Another object of the invention relates to a method for mounting the slave cylinder on the housing section and/or for mounting the pre-assembly unit, as already described above, in which:

• - the slave cylinder is pre-assembled, whereby the sealing disc is captively mounted to the fastening geometry of the cylinder housing in a pre-assembly step;
• - the slave cylinder is attached axially to the housing section as a pre-assembled unit in a further pre-assembly step.

In particular, the sealing disc is placed, preferably pressed, onto the fastening geometry in the axial direction in the pre-assembly step. For this purpose, the sealing disc is positioned correctly relative to the fastening geometry and then placed onto the fastening geometry in the axial direction, the fastening geometry being guided through the at least one fastening opening with elastic deformation of the fastening mold ring in order to produce a force-fitting connection. The slave cylinder is then positioned correctly relative to the housing section in the further pre-assembly step by inserting the centering contour into the centering receptacle and/or the anti-twist contour into the anti-twist receptacle of the housing section in order to fix the slave cylinder to the housing section in the circumferential direction. As part of the further pre-assembly step, the at least one fastening means is mounted in order to fix the slave cylinder to the housing section in the axial direction.

• 1 einen Nehmerzylinder in einer perspektivischen Darstellung als ein Ausführungsbeispiel der Erfindung;
• 2 eine Detailansicht des Nehmerzylinders aus 1 bei einer Vormontage einer Dichtscheibe;
• 3 eine Schnittdarstellung durch eine Befestigungskontur des Nehmerzylinders aus 1;
• 4 eine Vormontageeinheit mit dem Nehmerzylinder aus 1 in einer Explosionsdarstellung;
• 5 eine Schnittdarstellung durch die Befestigungskontur des Nehmerzylinders im montierten Zustand gemäß 4;
• 6 den Nehmerzylinder mit einer alternativen Befestigung der Dichtscheibe in einer axialen Ansicht;
• 7 eine Schnittdarstellung durch eine Zentrierungskontur des Nehmerzylinders aus 6;
• 8 eine Schnittdarstellung durch eine Verdrehsicherungskontur des Nehmerzylinders aus 6;
• 9 eine Detailansicht eines Zentrierungsdurchbruchs zur Aufnahme der Zentrierungskontur gemäß 7;
• 10 eine Detailansicht eines Verdrehsicherungsdurchbruchs zur Aufnahme der Verdrehsicherungskontur gemäß 8.

Further features, advantages and effects of the invention emerge from the following description of preferred embodiments of the invention. In the following:

• 1 a slave cylinder in a perspective view as an embodiment of the invention;
• 2 a detailed view of the slave cylinder 1 with pre-assembly of a sealing disc;
• 3 a sectional view through a mounting contour of the slave cylinder from 1 ;
• 4 a pre-assembly unit with the slave cylinder 1 in an exploded view;
• 5 a sectional view through the mounting contour of the slave cylinder in the assembled state according to 4 ;
• 6 the slave cylinder with an alternative fastening of the sealing disc in an axial view;
• 7 a sectional view through a centering contour of the slave cylinder 6 ;
• 8th a sectional view through an anti-twisting contour of the slave cylinder 6 ;
• 9 a detailed view of a centering hole for receiving the centering contour according to 7 ;
• 10 a detailed view of an anti-twisting opening for accommodating the anti-twisting contour according to 8th .

1 shows a slave cylinder 1, which is suitable for example for actuating a clutch device (not shown), for example a claw clutch. For example, the slave cylinder 1 can be integrated into a drive train of a motor vehicle. The slave cylinder 1 is designed as a concentric slave cylinder (CSC) and can be arranged, for example, concentrically and/or coaxially with respect to a longitudinal axis 100 to a shaft (not shown) of the drive train, preferably a transmission shaft.

The slave cylinder 1 has a cylinder housing 2 designed as an annular housing, which extends circumferentially around the longitudinal axis 100. The cylinder housing 2 is preferably designed as a plastic housing, wherein the cylinder housing 2 is preferably made from a material section or in one piece. The cylinder housing 2 has an annular space - not shown - which surrounds the longitudinal axis 100 and which is open in an axial direction 101 with respect to the longitudinal axis 100 and closed or limited in an axial opposite direction 102.

The slave cylinder 1 has a piston 3 designed as an annular piston and a further piston designed as an annular piston - not shown - which are arranged coaxially and/or concentrically to one another in relation to the longitudinal axis 100 in sections in the annular space of the cylinder housing 2. The two pistons 3 can be moved independently of one another in the axial direction in relation to the longitudinal axis 100.

The pistons 3 and the cylinder housing 2 delimit two pressure chambers (not shown) which flow around the longitudinal axis 100 and which can be connected to a hydraulic system via a pressure connection opening 4, 5. The pressure connection openings 4, 5 are each formed by an arcuate opening which extends in the circumferential direction with respect to the longitudinal axis 100 and which is introduced into an axial end face 6 of the cylinder housing 2. To actuate the slave cylinder 1, an operating medium, e.g. a hydraulic fluid, can thus flow into the respective pressure chamber via one of the pressure connection openings 4, 5 in order to transmit a hydraulic actuating force to the respective piston 3.

The cylinder housing 2 also has two fastening contours 7, 8, a centering contour 9 and two anti-twisting contours 10, 11, which are formed directly on the axial end face 6 of the cylinder housing 2 and extend in the same direction and/or parallel to one another in the axial opposite direction 102. The fastening contour 7, 8 are each formed by a fastening pin, the centering contour 9 by a centering pin and the anti-twisting contours 10, 11 by a cylinder section.

The slave cylinder 1 has a sealing disk 6 arranged coaxially to the longitudinal axis 100, which serves to seal the pressure connection openings 4, 5 in a fluid-tight manner when the slave cylinder 1 is installed as intended. The two fastening contours 7, 8 define a fastening geometry 13, via which the sealing disk 6 is pre-mounted in a force-fitting manner on the axial end face 6 of the cylinder housing 2. The slave cylinder 1 can thus be handled in a simple manner as a pre-assembled unit.

For this purpose, the sealing disk 10 has an annular disk 12 which has a pressure connection opening 14 which overlaps the pressure connection opening 4, a further pressure connection opening 15 which overlaps the further pressure connection opening 5, a fastening opening 16 which accommodates the fastening contour 7, a further fastening opening 17 which accommodates the further fastening contour 8, a centering opening 18 which accommodates the centering contour 9, an anti-twisting opening 19 which accommodates the anti-twisting contour 10 and a further anti-twisting opening 20 which accommodates the further anti-twisting contour 11.

The sealing disc 6 has an elastic sealing ring 21 arranged in the pressure connection opening 14 and a further elastic sealing ring 22 arranged in the further pressure connection opening 15, which are each in sealing contact with the cylinder housing 2. The sealing ring 21 surrounds the pressure connection opening 4 and the further sealing ring 22 surrounds the further pressure connection opening. 5 seals all around the cylinder housing 2. The pressure connection opening 4 thus opens within the sealing ring 21 and the further pressure connection opening 5 opens within the further sealing ring 22.

Furthermore, the sealing disk 6 has an elastic fastening molded ring 23 arranged in the fastening opening 16 and a further elastic fastening molded ring 24 arranged in the further fastening opening 17. The sealing disk 6 is placed in the axial direction 101 on the fastening contours 7, 8, the centering contour 9 and the anti-twisting contours 10, 11, with the ring disk 12 being held force-fittingly on the fastening contours 7, 8 via the two fastening molded rings 23, 24. For example, the ring disk 12 is made of sheet steel and the sealing molded rings 21, 22 and the fastening molded rings 23, 24 are each designed as rubber molded rings, which can be sprayed onto the ring disk 12 or inserted into the respective opening 21, 22, 23, 24.

The sealing disk 6 also has two elastic spacer elements 25, via which the ring disk 12 is supported in the axial direction 101 on the axial end face of the cylinder housing 2. In particular, the spacer elements 25 serve to set a constant distance between the ring disk 12 and the cylinder housing 2. For example, the spacer elements 25 can be designed as spacer studs sprayed onto the ring disk 12 or inserted into a separate opening.

The sealing rings 21, 22 and the fastening rings 23, 24 and/or the spacer elements 25 each have a support surface 26 on both sides, via which the sealing disk 6 can be supported axially with respect to the longitudinal axis 100. In the pre-assembled state, the sealing disk 6 is supported in the axial direction 101 via the support surfaces 26 facing the cylinder housing 2 on the axial end face of the cylinder housing 2.

2 shows the slave cylinder 1 in a detailed view during a pre-assembly step, whereby the sealing disk 6 is pressed onto the fastening geometry 13 in the axial direction 101. The two fastening contours 7, 8 are pressed into the respective fastening mold ring 23, 24, whereby the fastening mold rings 23, 24 are elastically deformed in order to form a frictional connection with the respective fastening contour 7, 8.

3 shows a sectional view through the fastening contour 7 in a pre-assembled state of the sealing disc 12. The elastic deformation of the fastening form rings 23, 24 generates a holding force 103 which is greater than the weight of the sealing disc 6. The sealing disc 12 is thus held securely to the fastening contours 7 by means of a static friction resulting from the holding force 103, so that no additional undercuts are required and a cost-effective design of the fastening geometry 13 is thus possible.

In the pre-assembled state, the sealing disc 12 is mounted axially in relation to the longitudinal axis 100 in relation to the cylinder housing 2 in a floating manner. This means that the ring disc 12 is supported at least in the axial direction 101 exclusively via the support surfaces 26 of the elastic components 21, 22, 23, 24, 25, so that the ring disc 12 can be moved relative to the cylinder housing 2 with a certain axial play. The design of the cross section of the sealing mold rings 21, 22 corresponds approximately to the cross section of the fastening mold ring 23 shown.

4 shows a pre-assembly unit 27 with the slave cylinder 1 and a housing section 28 in an exploded view. The housing section 28 forms, for example, a partition between the clutch device and a transmission device in a proper installation situation. The slave cylinder 1 has a pre-assembled switching crown 29 for actuating the clutch device, which is coupled in motion to the piston 3 of the slave cylinder 1. The switching crown 29 serves, for example, for the axial displacement of an actuating element - not shown - of the clutch device.

In a further pre-assembly step, the pre-assembled slave cylinder 1 is fastened to an axial end face of the housing section 28 by means of several fastening means 30, e.g. screws. For this purpose, the housing section 28 is provided lying down, with the slave cylinder 1 being positioned lying on the housing section 28 in an assembly direction 104, which corresponds in particular to the axial opposite direction 102. For this purpose, the centering contour 9 and the two anti-twisting contours 10, 11 each engage in an associated receptacle - not shown - formed on the housing section 28 in order to fix the slave cylinder 1 in the circumferential direction in a fixed orientation to the housing section 28. The fastening means 30 are then fixed to the housing section 28, e.g. screwed in, in order to fix the slave cylinder 1 in the axial direction to the housing section 28. The sealing disc 6 is held captively on the cylinder housing 2 during the entire pre-assembly process, so that the slave cylinder 1 is a can be mounted wall-free on the housing section 28.

The housing section 28 has two pressure connections 31, 32, wherein the pressure connection opening 4 is arranged opposite the one pressure connection 31 and the further pressure connection opening 5 is arranged opposite the further pressure connection opening 6. The sealing disk 6 is arranged axially between the cylinder housing 2 and the housing section 28 in order to seal the pressure connection 31 and the further pressure connection 32 all the way around with respect to the respective associated pressure connection opening 4, 5. Thus, a flow path for the operating medium can run from the pressure connection 31 via the pressure connection opening 14 and the pressure connection opening 4 into one pressure chamber and a further flow path for the operating medium can run from the further pressure connection 32 via the further pressure connection opening 15 and the further pressure connection opening 5 into the other pressure chamber of the slave cylinder 1, wherein the two flow paths are fluidically separated from one another.

5 showed a sectional view through the fastening contour 7, as already shown in 3 described, in an assembled state of the slave cylinder 1 on the housing section 28. The housing section 28 has a fastening receptacle 33 for each fastening contour 7, 8 - only one shown here - which serve to accommodate the fastening contour 7, 8 in the assembled state of the slave cylinder 2. The fastening contours 7, 8 protrude in sections into the fastening receptacle 33, the cylinder housing 2 being supported in a floating manner on the fastening receptacle 33 in the assembly direction 104 and in the circumferential direction via the fastening mold rings 23.

For this purpose, the fastening receptacles 33 have a support region 34 in which the fastening mold rings 23 are supported in a form-fitting or centered manner. For example, the fastening receptacles 33 are designed as bores, wherein the support region 34 is formed by a chamfer.

6 shows an alternative fastening variant of the sealing disc 6 on the slave cylinder 1 in an axial view with respect to the longitudinal axis 100. Instead of the two fastening contours 7, 8, as in 1 As shown, the centering contour 9 and the anti-twisting contour 10 form the fastening geometry 13. The centering opening 18 thus simultaneously forms the fastening opening 16 and the anti-twisting opening 19 simultaneously forms the further fastening opening 17. The fastening shaped ring 23 is arranged in the centering opening 18 and the further fastening shaped ring 24 is arranged in the further centering opening 19 in order to hold the ring disk 12 in a force-fitting manner to the centering contour 9 and the anti-twisting contour 10 via the two fastening shaped rings 23, 24. This allows the cylinder housing 2 to be designed to be even more compact and cost-effective.

The sealing disc 6 has four of the spacer elements 25, wherein the sealing disc 6 is fixed in the axial direction 101 to the cylinder housing 2 or in the axial opposite direction 102 to the housing section 28, as in 4 shown, is supported by the spacer elements 25 and the two sealing rings 21, 22. The two fastening rings 23, 24 serve in this embodiment exclusively to generate the holding force 103, as shown in the 7 and 8th is shown, wherein the fastening form rings 23, 24 are arranged in the axial direction 101 at a distance from the axial end face of the cylinder housing 2 or the housing section 28.

The 9 and 10 each show a detailed view of the fastening rings 23, 24, as shown in 6 The fastening rings 23, 24 each have four elastically deformable frictional connection contours 35 on their inner circumference, over which the fastening rings 23, 24 in the assembled state of the sealing disc 6, as shown in the 7 and 8th shown, are supported in a force-fitting manner on the fastening geometry 13. For example, the force-fitting contours 35 are each formed by a rubber web, which is elastically deformed when the sealing disk 6 is mounted and thus generates the holding force 103 or increases the static friction.

List of reference symbols

1

Slave cylinder

2

Cylinder housing

3

Pistons

4

Pressure connection opening

5

additional pressure connection opening

6

Sealing disc

7

Mounting contour

8th

further fastening contour

9

Centering contour

10

Anti-twisting contour

11

further anti-twisting contour

12

Ring disc

13

Mounting geometry

14

Pressure connection breakthrough

15

further pressure connection breakthrough

16

Fixing breakthrough

17

further fastening breakthrough

18

Centering breakthrough

19

Anti-twist breakthrough

20

further anti-twisting breakthrough

21

Sealing ring

22

additional sealing ring

23

Mounting ring

24

additional mounting ring

25

Distance form elements

26

Support surface

27

Pre-assembly unit

28

Housing section

29

Switch crown

30

Fasteners

31

Pressure connection

32

additional pressure connection

33

Mounting bracket

34

Support area

35

Traction contours

100

Longitudinal axis

101

axial direction

102

axial opposite direction

103

Holding force

104

Mounting direction

Claims (9)

Slave cylinder (1) for actuating a clutch device, - with a cylinder housing (2) which can be fastened to a housing section (28) and which defines a longitudinal axis (100), - with at least one piston (3) which is accommodated in the cylinder housing (2) so as to be displaceable coaxially with respect to the longitudinal axis (100), - with at least one pressure chamber which can be filled with an operating medium and which is formed between the piston (3) and the cylinder housing (2), wherein the cylinder housing (2) has at least one pressure connection opening (4) for connecting the pressure chamber to a hydraulic system, wherein a sealing disk (6) arranged coaxially with respect to the longitudinal axis (100) for sealing the at least one pressure connection opening (4) with respect to the housing section (28), wherein the pressure connection opening (4) is arranged on an axial end face of the cylinder housing (2) and the cylinder housing (2) has a fastening geometry (13) on the axial end face, to which the sealing disk (6) is fastened at least axially with respect to the longitudinal axis (100) is held captively, wherein the sealing disk (6) comprises an annular disk (12), characterized in that the sealing disk (6) has at least one elastic sealing molded ring (21) and at least one elastic fastening molded ring (23), wherein the annular disk (12) has at least one pressure connection opening (14) covering the pressure connection opening (4), in which the sealing molded ring (21) is arranged for circumferential sealing of the pressure connection opening (4), and has a fastening opening (16) receiving the fastening geometry (13), in which the fastening molded ring (23) is arranged for contact with the fastening geometry (13). Slave cylinder (1) after Claim 1 , characterized in that the sealing disc (6) is held force-fittingly on the fastening geometry (13), wherein a holding force (103) is at least greater than a weight force of the sealing disc (6). Slave cylinder (1) after Claim 1 or 2 , characterized in that the annular disc (12) is mounted in a floating manner with an axial play in relation to the longitudinal axis (100) relative to the cylinder housing (2) via the sealing molding ring (21) and the fastening molding ring (23). Slave cylinder (1) after Claim 2 or 3 , characterized in that the fastening shaped ring (23) has on its inner circumference at least one elastically deformable frictional connection contour, via which the fastening shaped ring (23) is supported in a frictional connection on the fastening geometry (13). Slave cylinder (1) according to one of the Claims 1 until 4 , characterized in that at least the at least one sealing mold ring (21) has an axial support surface (26) on both sides for axial support on the cylinder housing (2) and the housing section (28). Slave cylinder (1) according to one of the preceding claims, characterized in that the sealing disc (6) has at least one elastic spacer element (25) for axial support on the cylinder housing (2) and/or on the housing section (28). Slave cylinder (1) according to one of the preceding claims, characterized in that the cylinder housing (2) has at least one fastening contour (7), wherein the fastening geometry (13) is formed by the at least one fastening contour (7), and/or the cylinder housing (2) has at least one centering contour (9), wherein the fastening geometry (13) is formed by the at least one centering contour (9), and/or the cylinder housing (2) has at least one anti-twist contour (10), wherein the fastening geometry (13) is formed by the at least one anti-twist contour (10). Pre-assembly unit (27) for a clutch arrangement, with a housing section (28) and with the slave cylinder (1) according to one of the preceding claims, wherein the housing section (28) has at least one pressure connection (31) complementary to the pressure connection opening (4), wherein the slave cylinder (1) is supported axially with respect to the longitudinal axis (100) via the sealing disk (6) on the housing section (28) for the circumferential sealing of the pressure connection opening (4) with respect to the pressure connection (31). Method for assembling a slave cylinder (1) according to one of the Claims 1 until 7 on a housing section (28) and/or for mounting the pre-assembly unit (27) according to Claim 8 , in which: - the slave cylinder (1) is pre-assembled, wherein in a pre-assembly step the sealing disk (6) is captively mounted on the fastening geometry (13) of the cylinder housing (2) axially with respect to the longitudinal axis (100); - the slave cylinder (1) is fastened as a pre-assembled structural unit axially with respect to the longitudinal axis (100) to the housing section (28) in a further pre-assembly step.

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