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Piston-cylinder assembly for a disconnecting unit, especially for a master cylinder of a hydraulic clutch actuating device

A separation unit and piston technology, applied in the direction of clutches, fluid-driven clutches, non-mechanical drive clutches, etc., can solve the problems of restricting axial guidance and damaging the function of piston seals, etc.

Active Publication Date: 2017-12-15
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to compensate the tolerances of the piston and housing, such a rigid guide bush must be designed with a corresponding radial play, but this limits the axial guidance
Radial movement of the piston occurs especially at low temperatures and changes in lateral forces, which significantly impairs the function of the piston seals

Method used

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  • Piston-cylinder assembly for a disconnecting unit, especially for a master cylinder of a hydraulic clutch actuating device
  • Piston-cylinder assembly for a disconnecting unit, especially for a master cylinder of a hydraulic clutch actuating device
  • Piston-cylinder assembly for a disconnecting unit, especially for a master cylinder of a hydraulic clutch actuating device

Examples

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Embodiment Construction

[0018] exist figure 1 shows the master cylinder 1 of a hydraulic clutch actuating device, wherein the cylinder is designed as a housing 2 , wherein the housing 2 expands an annular pressure chamber 3 in which a hydraulic medium is contained. In this case, the piston 4 moves axially, which piston is mounted in the pressure chamber 3 . The piston 4 is actuated by a spindle actuator not shown further and moves hydraulic medium from the pressure chamber into the hydraulic line. Piston 4 is sealed relative to pressure chamber 3 by means of at least one annular seal 5 . as in figure 1 As shown in , there is also the possibility of using double seal rings.

[0019] The seal 5 is also designed annularly, whereby two sealing points result. Arranged on the housing 2 is an annular intermediate support 6 on which a guide element 7 , preferably an O-ring made of a relatively soft material, preferably an elastomer, is supported. In this case, the guide element 7 is arranged parallel to...

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Abstract

The invention relates to a piston-cylinder arrangement for a disengagement unit, in particular for a master cylinder of a hydraulic clutch actuation device, comprising a cylinder which is in the form of a housing (2) and which spans an annular pressure chamber (3) in which a piston (4) is mounted in axially movable fashion, wherein the piston (4) is sealed off with respect to the pressure chamber (3) by means of at least one seal (5). In the case of a piston-cylinder arrangement which can be guided without play at all operating temperatures and in the presence of adverse tolerances, an elastic guide element (7) is arranged in parallel with the seal (5) in the direction of motion of the piston (4), which guide element is composed of a material which, during a cooling process, hardens earlier than a material of the seal (5).

Description

technical field [0001] The invention relates to a piston-cylinder assembly for a disconnecting unit, in particular for a master cylinder of a hydraulic clutch actuating device, said piston-cylinder assembly comprising a cylinder designed as a housing which expands an annular pressure chamber , a piston is mounted axially movably in the pressure chamber, wherein the piston is sealed relative to the pressure chamber by at least one seal. Background technique [0002] Hydraulic master cylinders—as they are used in clutch actuating devices—consist of cylinders designed as housings. The housing forms an annular pressure chamber in which a piston is mounted axially movable. In order to seal the piston against the hydraulic medium located in the pressure chamber, the piston is provided with at least one seal. In the sealing of annular pistons, which are usually used in hydraulic clutch actuating devices, an axial offset of the two sealing points relative to one another also occur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16D25/08F16D25/12F16J15/3284
CPCF16D25/08F16D25/126F16D2025/081F16D2300/08F16J15/3284F16J15/3268F16J15/56
Inventor R·施特尔A·戈尔布诺夫A·格列博夫V·弗朗茨
Owner SCHAEFFLER TECH AG & CO KG
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