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Piston cylinder device, especially device used in separation system of motor vehicle

A technology for a motor vehicle and a separation system, which is applied in the field of piston-cylinder devices, can solve the problems of large permanent magnets, high cost, and consuming geometric dimensions, and achieves the effect of enhancing the magnetic field.

Inactive Publication Date: 2015-01-14
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high price of today's magnets, such switching point sensors are very costly, especially if they are required several times
In this case, the permanent magnets used as targets must be relatively large and have complex geometries

Method used

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  • Piston cylinder device, especially device used in separation system of motor vehicle
  • Piston cylinder device, especially device used in separation system of motor vehicle
  • Piston cylinder device, especially device used in separation system of motor vehicle

Examples

Experimental program
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Effect test

Embodiment Construction

[0020] Like features are denoted with like reference numerals.

[0021] exist figure 1 A first exemplary embodiment of a piston-cylinder arrangement 1 is shown in , as it is used in a clutch operating system in a motor vehicle. In the housing 2 designed as a cylinder, the piston 3 moves axially in the longitudinal extension of the housing 2 . For example, three Hall sensors 4 , 5 , 6 , which are magnetically preloaded, are arranged on the outside of the plastic housing 2 at a predetermined approximately equal distance. This means that each of the Hall sensors 4 , 5 , 6 is provided with a permanent magnet 7 . Thus, the permanent magnet 7 is fixed on each Hall sensor 4 , 5 , 6 such that the permanent magnet is away from the housing 2 . With the aid of permanent magnets 7 , each Hall sensor 4 , 5 , 6 is permanently actuated with a constant magnetic flux. This means that each Hall sensor 4 , 5 , 6 outputs a constant electrical signal in the form of a resulting Hall voltage whi...

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PUM

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Abstract

The invention relates to a piston cylinder device, especially a piston cylinder device used in a separation system in a motor vehicle. The piston cylinder device comprises a cylinder forming a housing. A piston is arranged inside the cylinder in a way to be capable of axial movement. A switching point sensor is fixed on the housing in order to perform displacement measurement on the piston. The switch point sensor is effectively connected with a component arranged on the piston and used for activating a switch point on the switch point sensor. In the piston cylinder device which can be realized in a low-cost ay, the switch point sensor forms a Hall sensor which is provided with a permanent magnet to set a preset magnetic flux. The component activating the switch point of the Hall sensor is composed of an iron magnet. Therefore, when the piston of the component bearing the iron magnet approaches the Hall sensor, the preset magnetic flux passing through the permanent magnet is changed.

Description

technical field [0001] The invention relates to a piston-cylinder arrangement, in particular for a separation system in a motor vehicle, which has a cylinder designed as a housing, on which a piston is mounted in an axially displaceable manner , and for measuring the displacement of the piston, a switching point sensor (Schaltpunktsensor) is fastened to the housing, said switching point sensor being operatively connected to a component arranged on the piston that activates the switching point of the switching point sensor. Background technique [0002] Linear displacement measuring systems are used in clutch actuating systems in motor vehicles in order to detect the position of a clutch actuating piston surrounded by a clutch master cylinder. In such linear displacement measuring systems, displacement sensors are used as sensor systems, which operate according to the principle of inductive action, in which an electrically conductive target fixed to the piston enters the magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B15/28G01B7/00F16D25/08F16D25/12
CPCF15B15/2807F16D25/12F16D2048/0212F16D2300/18G01D5/147
Inventor 蒂姆·赫尔曼纳丁·格拉曼
Owner SCHAEFFLER TECH AG & CO KG
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