CN104279205A - Piston cylinder device, especially device used in separation system of motor vehicle - Google Patents
Piston cylinder device, especially device used in separation system of motor vehicle Download PDFInfo
- Publication number
- CN104279205A CN104279205A CN201410283468.6A CN201410283468A CN104279205A CN 104279205 A CN104279205 A CN 104279205A CN 201410283468 A CN201410283468 A CN 201410283468A CN 104279205 A CN104279205 A CN 104279205A
- Authority
- CN
- China
- Prior art keywords
- piston
- hall transducer
- cylinder apparatus
- housing
- permanent magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D25/00—Fluid-actuated clutches
- F16D25/12—Details not specific to one of the before-mentioned types
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
- G01D5/147—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the movement of a third element, the position of Hall device and the source of magnetic field being fixed in respect to each other
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
- F16D2048/0212—Details of pistons for master or slave cylinders especially adapted for fluid control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2300/00—Special features for couplings or clutches
- F16D2300/18—Sensors; Details or arrangements thereof
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
The present invention relates to a kind of piston-cylinder apparatus, in particular for the piston-cylinder apparatus of the piece-rate system in motor vehicle, described piston-cylinder apparatus has the cylinder being configured to housing, piston is placed in described cylinder in axially movable mode, and be fixed with switching point sensor (Schaltpunktsensor) to carry out displacement measurement to piston on housing, described switching point sensor is effectively connected with the component of the switching point of the activator switch point sensor be arranged on piston.
Background technique
Linear displacement measuring system is used, to detect the position of the piston surrounded by clutch active cylinder of clutch actuation system in clutch actuation system in the motor vehicle.In this linear displacement measuring system, use displacement transducer as sensing system, institute's displacement sensors is according to the work of induced action principle, and the objective body that can conduct electricity wherein be fixed on piston enters into the magnetic field of coil device and changes described magnetic field.Other sensor utilizes Hall effect, is wherein fixed on the position of the magnet on piston by the independent Hall transducer scanning be arranged on cylinder.This linear displacement measuring system is known from DE 10 2,011 014 574A1.
Switching point sensor is used in such as starting in the application of halt system in the motor vehicle, to transmit switching signal when the particular displacement of the piston of clutch active cylinder.This Hall transducer the aid of permanent magnet being configured to switching point sensor runs, and described permanent magnet is fixed on piston as objective body.Because magnet price now improves, this switching point sensor is especially unusual high cost when it repeatedly needs.At this, the permanent magnet as objective body application must be relatively large and have the physical dimension expended.The attainable absolute precision of Hall transducer is very by force relevant to the magnetization error of used permanent magnet except mechanical tolerance.
Summary of the invention
Therefore, the present invention is based on following object, propose a kind of piston-cylinder apparatus, described piston-cylinder apparatus still guarantees when applying the material of low cost the position identifying piston exactly.
According to the present invention, described object is realized by following manner: switching point sensor is configured to Hall transducer, described Hall transducer is equipped with permanent magnet to set default magnetic flux, and form with activating the component ferromagnet of the switching point of Hall transducer, thus when carrying the piston of ferromagnetic component near Hall transducer, the change of flux preset by permanent magnet.Be used as objective body by ferromagnetic component is substituted permanent magnet, reduce the cost for this piston-cylinder apparatus.Due to the magnetic preload that the magnetic flux preset passing through arranged permanent magnet of Hall transducer causes, the absolute precision as the Hall transducer of switching point working sensor is improved.Meanwhile, using less permanent magnet to produce preloading of Hall transducer, this also reduces manufacture cost.By permanent magnet, preloading Hall transducer can transmit the electrical signal proportional with magnetic field, and this contributes to the state of the restriction of total system when the initialization of piston in initial position simultaneously.Close by ferromagnetic component, the output voltage of change of flux and then Hall transducer also changes, wherein when lower than limiting value, by the output voltage output switching signal of Hall transducer, described switching signal represents the discrete measured value of the displacement of piston.
Advantageously, the multiple Hall transducers comprising permanent magnet are arranged on the housing with the longitudinal extension of the spacing preset along housing, and the ferromagnetic component that radial direction is arranged on piston is opposite with described housing.Due to described layout, the position of piston within housing being in the switching threshold of restriction can be detected simply in the whole length of cylinder.
In a design proposal, the piston sensor activated by the ferromagnetic component moved in the first moving direction remains in described state, until ferromagnetic component in the second contrary moving direction through described Hall transducer.Therefore, it is possible to accurately detection piston is engraved in the current position within piece-rate system when each.
In a design proposal, Hall transducer is connected with permanent magnet via at least one flux guide body.Passing flux guide body, the magnetic field of permanent magnet strengthens towards Hall transducer.The change such as excited by the impact of the temperature of the environment of piston-cylinder apparatus in magnetic field is strengthened and proportional reduction by magnetic field, make thus by the signal that exported by Hall transducer correctly owing to the process of ferromagnetic component.Thus, the signal exported when not having the affecting of ferromagnetic component at Hall transducer and Hall transducer increase in ferromagnetic component Hall transducer signal intensity difference between the signal exported afterwards, make to guarantee accurate displacement measurement.
In a variations, permanent magnet is arranged on Hall transducer on the direction deviating from housing.Described variations allows flux guide body optimally for strengthening magnetic field.
As an alternative, ferromagnetic component is provided with additional magnet.Also following possibility is there is: increase the magnetic field on Hall transducer, to improve switching signal by means of described additional magnet.
Advantageously, additional magnet is arranged on ferromagnetic component towards Hall transducer.Described design proposal is guaranteed: can realize the large magnetic field enhancement effect on Hall transducer by relatively little additional magnet.
In an improvement project, ferromagnetic component is made up of iron, tinsel, electric steel plate (Elektroblech).These materials are raw material of very low cost, and therefore this causes the implementation of the low cost of described piston-cylinder apparatus.
In another embodiment, housing is made of plastics, and wherein Hall transducer is arranged on housing in outside.The inner space of the ferromagnetic component of the guiding entering into housing is expanded in the magnetic field that plastic casing can realize Hall transducer uninterruptedly.In addition, make mechanical collision to occur between Hall transducer and ferromagnetic component, because described Hall transducer and ferromagnetic component are arranged on the not homonymy of housing.
Accompanying drawing explanation
The present invention allows numerous embodiments.One of them should elaborate according to the accompanying drawing illustrated in the drawings.
Accompanying drawing illustrates:
Fig. 1 illustrates an embodiment according to piston-cylinder apparatus of the present invention,
Fig. 2 illustrates an embodiment for the Hall transducer preloaded,
Fig. 3 illustrates the simulation of the magnetic field line of the Hall transducer according to Fig. 2,
Fig. 4 illustrates the second embodiment according to piston-cylinder apparatus of the present invention.
Embodiment
The identical reference character of identical feature represents.
First embodiment of piston-cylinder apparatus 1 shown in Figure 1, as described in piston-cylinder apparatus application clutch actuation system in the motor vehicle.In the housing 2 being configured to cylinder, piston 3 axially moves on the longitudinal extension of housing 2.On the outside of the housing 2 be made of plastics, be such as provided with three Hall transducers 4,5,6, wherein said Hall transducer 4,5,6 magnetic preload with the almost identical spacing preset.This represents, each in Hall transducer 4,5,6 is provided with permanent magnet 7.Therefore, described permanent magnet 7 is fixed on each Hall transducer 4,5,6, makes described permanent magnet away from housing 2.By means of permanent magnet 7, each Hall transducer 4,5,6 controls by constant magnetic flux enduringly.This represents, each Hall transducer 4,5,6 exports with the constant electrical signal of the form of the Hall voltage obtained, and described Hall voltage is relevant to the magnetic flux density of applying.
Piston 3 is radially provided with ferromagnetic component 8 in the mode pointing to Hall transducer 4,5,6, such as ferromagnetic tinsel.Close due to the motion of piston 3 by ferromagnetic component 8, the magnetic flux on Hall transducer 4,5,6 changes successively and then is changed successively by the Hall voltage of Hall transducer 4,5,6 output equally.Each Hall transducer 4,5,6 detects the change of magnetic flux density, and this causes and the output signal of less Hall voltage as Hall transducer 4,5,6 is exported.
Fig. 1 a illustrates piston-cylinder apparatus, and in described piston-cylinder apparatus, ferromagnetic component 8 is arranged on outside the action radius of Hall transducer 4,5,6.Because ferromagnetic component 8 does not still have an impact, so also can not produce switching point to the magnetic flux for preloading Hall transducer 4,5,6 in said device.The output signal of Hall transducer 4,5,6 does not change.
In Figure 1b, ferromagnetic component 8 is positioned under the first Hall transducer 4.At this, the magnetic flux experienced by Hall transducer 4 is reduced, and therefore Hall transducer 4 exports less Hall voltage.If described Hall voltage is lower than switching threshold, so by the sensor electronics output switching signal that do not illustrate further and then output displacement measured value.Because ferromagnetic component 8 is not still in the region of Hall transducer 5,6, these two Hall transducers 5,6 only export following Hall voltage, and described Hall voltage is detected based on the magnetic flux preset by permanent magnet 7.
In figure 1 c, ferromagnetic component 8 is in the region of the second Hall transducer 5 by piston 3.Ferromagnetic component 8 changes the magnetic flux density in the region of Hall transducer 5 now, this is detected by Hall transducer 5 and wherein said Hall transducer exports the Hall voltage of change equally, and described Hall voltage is in the previously described manner by sensor electronics process.
Fig. 1 d illustrates the ferromagnetic component 8 in the region of the 3rd Hall transducer 6.At this, Hall transducer 6 also detects the magnetic flux density reduced because ferromagnetic component 8 enters into the magnetic field that limited by permanent magnet 7.Export and process corresponding Hall voltage further.
In the position illustrated, piston 3 is only moving upward towards the side of Hall transducer 4,5,6 so far.At ferromagnetic component 8 through afterwards, Hall transducer 4,5,6 remains in the state activated so respectively.Until ferromagnetic component 8 along contrary moving direction move and again to get back to reach the first Hall transducer 4 time, the described state of Hall transducer 4,5,6 just removes and described Hall transducer is got back in original state, in described original state, described Hall transducer only detects the magnetic flux caused by permanent magnet 7.
In order to the switching point of Hall transducer 4,5,6 accurately can be detected, the signal difference formed through out-of-date Hall voltage at ferromagnetic component 8 by Hall transducer 4,5,6 Hall voltage in the initial state and same Hall transducer 4,5,6 must be strengthened.At this, the difference of assessment two signals.For described reason, permanent magnet 7 arranges flux guide body 9,10 towards Hall transducer 4,5,6, change to strengthen magnetic field and then strengthen difference signal.Illustrate Hall transducer 4 in fig. 2 a together with flux guide body 9 and 10, wherein there is not ferromagnetic component 8.At this, flux guide body 9,10 carries permanent magnet 7 simultaneously.Magnetic flux flow in Hall transducer 4 by permanent magnet 7 and through flux guide body 9,10, and described Hall transducer is directly fixed on housing 2.Fig. 2 b illustrates the change of the magnetic flux when ferromagnetic component 8 is positioned under Hall transducer 4.Subsequently, but by permanent magnet 7 magnetic flux produced flows through ferromagnetic component 8 not through Hall transducer 4 via flux guide body 9,10.Therefore, Hall transducer 4 detects less magnetic flux density now, and this causes the reduction of the Hall voltage based on it.The passing flux guide body of difference signal (
) 9,10 enhancing prevent from the temperature due to the environment of piston-cylinder apparatus from affecting the signal of error that has caused exporting.
Fig. 3 illustrates the change caused by the magnetic flux density in Fig. 2 of magnetic field line.Fig. 3 a is illustrated in field wire change when there is not ferromagnetic component 8.At this, field wire leaves from permanent magnet 7 in both sides and partly deflects into sensor region 11 through flux guide body 9,10.As found out from Fig. 3 b, when there is ferromagnetic component 8, magnetic circuit closes through flux guide body 9,10 and ferromagnetic component 8, strengthens magnetic flux thus and can assess the difference signal of the improvement in sensor electronics.
Strengthen other the possibility being used for the magnetic flux reliably producing switching point to be, ferromagnetic component 8 is mounted with additional magnet 12.At this, additional magnet 12 is arranged to, make additional magnet when piston 3 moves with Hall transducer 4,5,6 opposite.Described additional magnet 12 is less than permanent magnet 7 at this in its size, described permanent magnet 7 and Hall transducer 4,5,6 forming unit.
The embodiment completed illustrates the displacement measurement system of the clutch release assembly for motor vehicle, and described clutch release assembly carrys out work by means of the permanent magnet of that reduce or few load, and is therefore the variations of low cost.
Reference numerals list:
1 piston-cylinder apparatus
2 housings
3 pistons
4 Hall transducers
5 Hall transducers
6 Hall transducers
7 permanent magnets
8 ferromagnetic components
9 flux guide bodies
10 flux guide bodies
11 sensor regions
12 additional magnet.
Claims (9)
1. a piston-cylinder apparatus, in particular for the piston-cylinder apparatus of the piece-rate system in motor vehicle, described piston-cylinder apparatus has the cylinder being configured to housing (2), piston (3) is supported with in the mode that can move axially in described cylinder, and on described housing (2), be fixed with switching point sensor (4 in order to carrying out displacement measurement to described piston (3), 5,6), described switching point sensor and the described switching point sensor (4 of activation be arranged on described piston (3), 5,6) component (8) of switching point effectively connects
It is characterized in that, described switching point sensor is configured to Hall transducer (4,5,6), described Hall transducer is equipped with permanent magnet (7) to set default magnetic flux, and activate described Hall transducer (4,5,6) the described component (8) of switching point is formed by ferromagnet, thus at the close described Hall transducer (4 of the described piston (3) of the ferromagnetic described component (8) of carrying, 5,6) time, the change of flux preset by described permanent magnet (7).
2. piston-cylinder apparatus according to claim 1, it is characterized in that, comprise multiple Hall transducers (4 of permanent magnet (7), 5,6) arrange on the housing with the extending longitudinally of the spacing preset along described housing (2), the ferromagnetic described component (8) that radial direction is arranged on described piston (3) is opposite with described housing.
3. piston-cylinder apparatus according to claim 1 and 2, it is characterized in that, the described Hall transducer (4 activated by the ferromagnetic described component (8) moved in the first moving direction, 5,6) remain in described state, until ferromagnetic described component (8) in the second contrary moving direction through described Hall transducer.
4. the piston-cylinder apparatus according to any one of the claims, is characterized in that, described Hall transducer (4,5,6) is connected with described permanent magnet (7) via at least one flux guide body (9,10).
5. the piston-cylinder apparatus according to any one of the claims, is characterized in that, described permanent magnet (7) is arranged on described Hall transducer (4,5,6) on the direction deviating from described housing (2).
6. the piston-cylinder apparatus according to item at least one in the claims, is characterized in that, ferromagnetic described component (8) is provided with additional magnet (12).
7. piston-cylinder apparatus according to claim 6, is characterized in that, described additional magnet (12) is arranged on ferromagnetic described component (8) towards described Hall transducer (4,5,6).
8. the piston-cylinder apparatus according to item at least one in the claims, is characterized in that, ferromagnetic described component (8) is made up of iron, tinsel or electric steel plate.
9. the piston-cylinder apparatus according to any one of the claims, is characterized in that, described housing (2) is made of plastics, and wherein said Hall transducer (4,5,6) is arranged on described housing (2) in outside.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102013212955.6 | 2013-07-03 | ||
| DE102013212955 | 2013-07-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104279205A true CN104279205A (en) | 2015-01-14 |
| CN104279205B CN104279205B (en) | 2018-05-25 |
Family
ID=52106481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410283468.6A Expired - Fee Related CN104279205B (en) | 2013-07-03 | 2014-06-23 | Piston-cylinder apparatus, the piston-cylinder apparatus in particular for the piece-rate system in motor vehicles |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104279205B (en) |
| DE (1) | DE102014211146A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106369071A (en) * | 2015-07-23 | 2017-02-01 | 法雷奥离合器公司 | Hydraulic actuator equipped with a sensor that is assembled to a body of the hydraulic actuator |
| CN108151770A (en) * | 2016-12-06 | 2018-06-12 | 通用汽车环球科技运作有限责任公司 | Encapsulate magnet positions switch |
| CN112639408A (en) * | 2018-09-06 | 2021-04-09 | 克诺尔商用车制动系统有限公司 | Magnet holder and travel sensor having a magnet holder |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016204890A1 (en) | 2016-03-23 | 2017-09-28 | Schaeffler Technologies AG & Co. KG | A method of adjusting a magnetic sensor device to an actuator and actuator with an electric motor and a magnetic sensor device |
| DE102016223608A1 (en) * | 2016-11-29 | 2018-05-30 | Schaeffler Technologies AG & Co. KG | Piston-cylinder arrangement, in particular for a clutch actuator of a vehicle |
| CN110407012A (en) * | 2019-07-10 | 2019-11-05 | 大族激光科技产业集团股份有限公司 | Material delivery method, feeding device and its receiving mechanism |
| JP7268664B2 (en) * | 2020-03-10 | 2023-05-08 | 株式会社デンソー | Position detector |
| DE112021001505T5 (en) * | 2020-03-10 | 2022-12-29 | Denso Corporation | position detection device |
| DE102021102916A1 (en) * | 2021-02-09 | 2022-08-11 | Valeo Schalter Und Sensoren Gmbh | Operating device for a vehicle with a permanent magnet, a ferromagnetic flux guide and a Hall element and method for operating such an operating device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3246731A1 (en) * | 1982-12-17 | 1984-06-20 | Wabco Westinghouse Steuerungstechnik GmbH & Co, 3000 Hannover | Device for detecting the position of the piston of a working cylinder |
| US4857842A (en) * | 1987-06-03 | 1989-08-15 | Kineret Engineering | Temperature compensated hall effect position sensor |
| EP0805279A2 (en) * | 1996-04-30 | 1997-11-05 | Weber-Hydraulik GmbH | Piston-cylinder unit |
| JP2002323300A (en) * | 2001-04-23 | 2002-11-08 | Shigeo Hirose | Cylinder unit and mine sensor |
| CN201121621Y (en) * | 2007-11-06 | 2008-09-24 | 江苏武进液压启闭机有限公司 | Hydraulic cylinder with built-in travel range testing apparatus |
| DE102011014574A1 (en) * | 2010-04-08 | 2011-12-15 | Schaeffler Technologies Gmbh & Co. Kg | Linearwegmesssystem |
| CN102400978A (en) * | 2011-11-10 | 2012-04-04 | 江苏武进液压启闭机有限公司 | Coal mine machinery hydraulic oil tank with stroke detecting device |
-
2014
- 2014-06-11 DE DE102014211146.3A patent/DE102014211146A1/en not_active Withdrawn
- 2014-06-23 CN CN201410283468.6A patent/CN104279205B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3246731A1 (en) * | 1982-12-17 | 1984-06-20 | Wabco Westinghouse Steuerungstechnik GmbH & Co, 3000 Hannover | Device for detecting the position of the piston of a working cylinder |
| US4857842A (en) * | 1987-06-03 | 1989-08-15 | Kineret Engineering | Temperature compensated hall effect position sensor |
| EP0805279A2 (en) * | 1996-04-30 | 1997-11-05 | Weber-Hydraulik GmbH | Piston-cylinder unit |
| JP2002323300A (en) * | 2001-04-23 | 2002-11-08 | Shigeo Hirose | Cylinder unit and mine sensor |
| CN201121621Y (en) * | 2007-11-06 | 2008-09-24 | 江苏武进液压启闭机有限公司 | Hydraulic cylinder with built-in travel range testing apparatus |
| DE102011014574A1 (en) * | 2010-04-08 | 2011-12-15 | Schaeffler Technologies Gmbh & Co. Kg | Linearwegmesssystem |
| CN102400978A (en) * | 2011-11-10 | 2012-04-04 | 江苏武进液压启闭机有限公司 | Coal mine machinery hydraulic oil tank with stroke detecting device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106369071A (en) * | 2015-07-23 | 2017-02-01 | 法雷奥离合器公司 | Hydraulic actuator equipped with a sensor that is assembled to a body of the hydraulic actuator |
| CN108151770A (en) * | 2016-12-06 | 2018-06-12 | 通用汽车环球科技运作有限责任公司 | Encapsulate magnet positions switch |
| DE102017128509B4 (en) | 2016-12-06 | 2023-02-02 | GM Global Technology Operations LLC | Encapsulated magnetic position switch |
| CN112639408A (en) * | 2018-09-06 | 2021-04-09 | 克诺尔商用车制动系统有限公司 | Magnet holder and travel sensor having a magnet holder |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102014211146A1 (en) | 2015-01-08 |
| CN104279205B (en) | 2018-05-25 |
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Address after: German Herzogenaurach Applicant after: Schaeffler Technologies GmbH & Co. KG Address before: German Herzogenaurach Applicant before: Schaeffler Technologies GmbH & Co. KG |
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Granted publication date: 20180525 Termination date: 20210623 |