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method used to position the piston

A piston and stop position technology, applied in non-mechanical drive clutches, fluid drive clutches, electric clutches, etc., can solve problems such as gap leakage

Active Publication Date: 2017-12-08
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From this point on, the piston-cylinder-seal system should be tight, but because at low temperatures the seals are no longer very elastic, said seals are no longer able to accommodate the closing of the piston to the same extent as at high temperatures. , smooth surface
Thus, due to the rosette shape a gap occurs between the seal and the piston surface, said gap thus causing leakage and the desired pressure can no longer be built up

Method used

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Examples

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Embodiment Construction

[0029] exist figure 1 The configuration of the hydraulic clutch system 1 is schematically shown in FIG. 1 by way of example of a schematically shown hydraulic and hydrostatic clutch actuator (HCA) known from the prior art. The schematic diagram only shows the configuration for actuating one of the two clutches of the dual clutch transmission, the second clutch being actuated analogously. On the drive side 15 , hydraulic clutch system 1 includes a control device 2 , which controls an actuator 3 . With the actuator 3 and the piston 19 changing positions in the cylinder 4 to the right along the actuator path, the volume of the cylinder 4 is changed, whereby a pressure P is built up in the cylinder 4, said pressure via the pressure medium 7 via The hydraulic line 9 leads to the output side 16 of the hydraulic clutch system 1 . The hydraulic lines 9 are adapted to the structural conditions of the vehicle with respect to their length and shape. On the driven side 16, the pressure...

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PUM

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Abstract

A method for controlling an actuating device of an automatic clutch in a motor vehicle, wherein the actuating device is controlled by means of a control device, and wherein the actuating device has a piston and a cylinder and circumferentially on the piston or on the cylinder A sealing ring provided on the cylinder for positioning the piston in the cylinder in the axial direction, wherein the cylinder and / or the piston have openings in the corresponding surface of the cylinder and / or the piston, which openings in the axial direction when the piston moves Can be traversed by the sealing ring in both directions, is characterized in that, in the preset parked state of the vehicle, the piston is moved into a rest position in the cylinder, wherein the rest position is selected in the cylinder such that the seal ring has no contact with the opening Overlapping positioning.

Description

technical field [0001] The invention relates to a method for controlling an actuation device of an automatic clutch in a motor vehicle. [0002] The scope of use and the object of application of the invention are hydrostatic actuators, in particular actuators for clutch actuation. Background technique [0003] German publication DE 10 2012 204 635 A1 discloses a control device with tracking functionality. DE 197 34 038 A1 discloses a throughflow circuit with a throughflow opening in a clutch brake device and a method for ascertaining the position of the throughflow opening. [0004] According to the invention, the positioning of the piston in the master cylinder is described in a clutch actuation device of a clutch of a dual clutch transmission with a hydrostatic clutch system in a non-operating vehicle. The hydrostatic clutch system is designed with a clutch actuating device, as for example in figure 1 as described in DE 10 2010 047 800 A1 and in DE 10 2010 047 801 A1. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16D25/06F16D25/12
CPCF16D25/06F16D25/12F16D25/08F16D28/00F16D48/02F16D48/06F16D2025/081F16D2048/0212F16D2300/08F16D2500/50263
Inventor 马可·博罗夫斯基亚历山大·伦费尔
Owner SCHAEFFLER TECH AG & CO KG