EP2394063A1 - Ensemble piston-cylindre avec dispositif de mesure intégré - Google Patents

Ensemble piston-cylindre avec dispositif de mesure intégré

Info

Publication number
EP2394063A1
EP2394063A1 EP09740258A EP09740258A EP2394063A1 EP 2394063 A1 EP2394063 A1 EP 2394063A1 EP 09740258 A EP09740258 A EP 09740258A EP 09740258 A EP09740258 A EP 09740258A EP 2394063 A1 EP2394063 A1 EP 2394063A1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
sensor
measuring device
cylinder assembly
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
Application number
EP09740258A
Other languages
German (de)
English (en)
Other versions
EP2394063B1 (fr
Inventor
Mike Heurich
Tino Wiggers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF CV Systems Hannover GmbH
Original Assignee
Wabco GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Wabco GmbH filed Critical Wabco GmbH
Publication of EP2394063A1 publication Critical patent/EP2394063A1/fr
Application granted granted Critical
Publication of EP2394063B1 publication Critical patent/EP2394063B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means
    • 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

Definitions

  • the present invention relates to a piston-cylinder arrangement, in particular for pneumatic, hydraulic or mechatronic systems, with a cylinder housing and a piston which is coupled to a piston rod, arranged in a cylinder housing and arranged to be movable along a longitudinal axis.
  • the piston-cylinder arrangement here usually serves the purpose of converting pressures applied to a piston into a movement of the piston rod. This movement is used in the various technical fields for controlling and / or driving machinery or machine elements.
  • Known systems realize the position detection of the piston or the piston rod by means of measuring devices which are arranged externally on the piston-cylinder arrangement and detect the change in position of the piston rod by means of various measuring methods, for example inductive measuring methods.
  • Such systems have several disadvantages. Especially in installation environments, which require a small space of the piston-cylinder assembly, the known measuring systems can not be used. The often available space is not sufficiently dimensioned for this purpose. In particular, the installation dimension of the piston-cylinder arrangement in the stroke direction is typically limited in practice. But this is just the preferred arrangement of the measuring systems in devices of the type mentioned. It is therefore an object of the present invention to provide a piston-cylinder assembly which allows a position detection of the piston and / or the piston rod with the least possible space.
  • the present invention solves the underlying object in a device of the type mentioned by a arranged within the cylinder housing measuring device.
  • Such an inventive integration of the measuring device in the cylinder housing leads to a significant reduction of the installation space and on the other hand to an approximation of the measuring device to the piston and / or the piston rod. Due to the reduced distance of the measuring device to the piston or piston rod, the position detection is more accurate and less susceptible to interference, as potential disturbances that could affect the outside of the measuring device, be shielded by the cylinder housing on the one hand and on the other only a reduced distance between Measuring device and measuring object can act.
  • the measuring device extends parallel to the longitudinal axis of the piston, and the piston and / or the piston rod are axially movable relative to the measuring device. Due to the parallel arrangement of the measuring device with respect to the piston in particular a shortening of the installation space in the stroke direction is achieved. Whereas in the case of previously known systems the overall length was negatively influenced by an arrangement of measuring devices in that the measuring devices were always arranged externally and in particular in the stroke direction before or after the cylinder housing, the smallest possible installation space can be realized according to this embodiment.
  • the measuring device has a PLCD sensor. Characterized in that the measuring device is integrated according to this invention in the housing and as close as possible to the piston-cylinder assembly, it is possible to use PLCD sensors. In known systems, this was not possible because the distance between a mounted from the outside of the cylinder assembly measuring device to the movable piston and the piston rod was too large. This problem becomes clear when considering the functional principle of PLCD sensors: PLCD sensors typically have a soft magnetic metal core surrounded by a coil. The movable object whose position is to be determined has a permanent magnet, which generates a local magnetic saturation when approaching the sensor.
  • the PLCD sensor is at least partially disposed within a recess in the piston, and the measuring device comprises a magnet which is connected as a signal transmitter to the piston.
  • the PLCD sensor can be arranged even further in the direction of the lifting axis.
  • a minimum distance between the sensor and the magnet attached to the piston can be realized.
  • the susceptibility of the measuring device is reduced even further in this way.
  • the magnet is designed as a ring magnet and arranged coaxially with the longitudinal axis of the piston.
  • the magnet can be arranged and fastened on a cylindrically shaped shoulder. Canting is unlikely.
  • the fact that the magnet is designed as a ring magnet it is irrelevant for the proper operation of the PLCD sensor and thus the measuring device, whether the piston and / or the piston rod in addition to the pure lifting movement and a rotation about the longitudinal axis of the piston or the Carry out piston rod.
  • a rotation of the ring magnet has no influence on its magnetic field. Thus is regardless of the rotational position of the piston or the piston rod always the same magnetic field is present, which acts on the sensor.
  • the PLCD sensor is integrated in a cylinder cover.
  • the sensor which is fixedly positioned relative to the cylinder cover, be introduced with high accuracy and repeatability in the housing of the piston-cylinder assembly. This is facilitated in particular by the fact that the cylinder cover is always mounted in the same arrangement on the housing. Removal of the sensor is possible by simply removing the cover and facilitates maintenance and calibration of the measuring device.
  • the PLCD sensor is placed inside a sleeve which is integrally formed on the cylinder cover.
  • the sleeve can advantageously be manufactured with small tolerances and adapted to the sensor. Furthermore, an exact positioning of the sleeve is possible if it is positioned relative to the cylinder cover with known to the expert fitting elements.
  • the cylinder cover may be a simple casting in such an approach, for example.
  • the PLCD sensor is integrated in the piston, and the ring magnet is integrated in the cylinder housing or in a seal.
  • the measurement of the piston position is not effected by a movement of a magnet fixedly connected to the piston relative to a fixedly mounted sensor, but in the case by a movement of the sensor relative to a stationarily mounted ring magnet.
  • Such an embodiment may be advantageous for manufacturing economic reasons or due to special requirements on the part of the user.
  • this has a drag piston, which is arranged substantially coaxially to the longitudinal axis of the piston and axially movable relative to the piston and / or the piston rod.
  • Piston-cylinder arrangements which in addition to a main piston additionally have a drag piston were not operable with the known measuring devices. The reason for this is that the drag piston, which is additionally arranged within the cylinder housing, the distance between the externally arranged measuring system and the main piston or the Koi enlarged. A reliable measurement of the position of the main piston and / or the piston rod was thus no longer possible. According to the present invention, however, this disadvantage is overcome, so that piston-cylinder arrangements with drag piston can be realized with simultaneous position detection by means of a measuring device in the smallest space.
  • the senor extends at least partially within a recess which is provided in the drag piston.
  • the sensor can extend in this way both within the piston and the drag piston, whereby the shortness of the space in the stroke direction is unaffected. Furthermore, it is thereby possible that the sensor is arranged within a recess of the drag piston, that the movement of the drag piston does not affect the measurement itself.
  • the senor is arranged between the ring magnet and the drag piston.
  • the sensor is thus brought in direct proximity to the ring magnet according to this embodiment, and a measurement of the position of the ring magnet and thus the piston and / or the piston rod can take place without the drag piston, which the ring magnet and the sensor and the portion of the main piston in which the sensor extends surrounds.
  • the piston and the piston rod are integrally connected to each other.
  • the one-piece connection of the piston with the piston rod a movement between the two elements is excluded. This makes it irrelevant whether the position of the piston rod or the piston is determined.
  • Figure 1 is a sectional view of a piston-cylinder assembly according to the invention in the plane in which the longitudinal axis of the piston rod extends
  • Figure 2 is a sectional view of another embodiment of the piston-cylinder assembly according to the invention in a plane in which the longitudinal axis of the piston rod extends.
  • a piston-cylinder arrangement 1 according to the present invention is shown in FIG.
  • the piston-cylinder assembly 1 has a cylinder housing 3 which is closed by a cylinder cover 7.
  • the cylinder housing 3 and the cylinder cover 7 are rotationally symmetrical with respect to a symmetry axis 5 and aligned coaxially with each other.
  • the cylinder cover 7 is sealed against an inner wall of the cylinder housing 3 by means of a sealing element 9.
  • An evaluation electronics (not shown) may be arranged inside the cylinder lid 7.
  • a main piston 1 1 is disposed inside the cylinder housing 3 coaxially with the axis 5.
  • the main piston 11 is integrally connected to a piston rod 13, which is also aligned coaxially with the axis 5.
  • the main piston 13 is sealed by means of a sealing element 15 against an inner wall of the housing 3.
  • Another sealing element 17 is arranged on an outlet section of the housing 3, on which the piston rod 13 emerges from the housing 3.
  • a drag piston 19 is arranged in an upper portion of the main piston 11 in FIG.
  • the drag piston 19 is formed substantially annular and surrounds the main piston 11 in the upper portion in the figure of the main piston 11.
  • the drag piston 19 is by means of a sealing member 21 against the main piston 11 and by means of a sealing member 23 against an inner wall of the housing 3 sealed.
  • the drag piston 19 is axially movable in the direction of the axis 5 relative to the housing 3 and the main piston 11.
  • the outer diameter of the drag piston 19 in the upper section in FIG. 1 is greater than the outer diameter of the main piston 11 in the lower section in FIG.
  • the main piston 11 has an annular recess 25, which is aligned coaxially to the axis 5 and extends from an upper end side in FIG. 1 of the main piston 11 into the piston.
  • a PLCD sensor 27 is disposed within the recess 25, which is part of a measuring device. Another part of this measuring device is a ring magnet 29 which is fixedly disposed on an upper shoulder of the main piston 11, for example by press fitting and is arranged coaxially with the axis 5.
  • the PLCD Sensor 27 is disposed within a sensor housing 31 parallel to the axis 5 and aligned.
  • the sensor housing 31 is integrally formed on the cylinder cover 7. Conductor tracks are led out of the housing 3, starting from the sensor 27, through the cylinder cover 7. The sensor 27 is thus stationary with the cylinder cover 7 and thus in the assembled state also connected to the housing 3. A movement of the main piston 11 or the rod 13 results in a movement of the ring magnet 29 relative to the sensor 27th
  • FIG. 2 shows a further embodiment of a piston-cylinder arrangement according to the invention.
  • the housing 3 has two separately formed housing parts 35 and 37.
  • the cylinder cover 7, on which the sensor housing 31 is integrally formed with the sensor 27, is finally connected to the housing part 35.
  • a bell 33 rests on the cylinder cover 7. and closes off the housing 3.
  • the outer diameter of the main piston 11 is smaller than the outer diameter of the drag piston 19 in this embodiment.
  • the main piston 11 is sealed with (not shown) sealing elements against the inner wall of the housing part 35, while the drag piston 19 is sealed with (also not shown) sealing elements against the inner wall of the housing part 37.
  • the main piston 1 1 is further sealed by means of a (not shown) sealing element against a portion 47 of the housing part 37.
  • the main piston 11 has a cylindrical recess 41.
  • the recess 41 is aligned coaxially with the axis 5 and extends from the upper end face of the main piston 1 1 downward.
  • a support element 43 is arranged on the end face of the main piston 11 and connected by means of fastening means 45 to the main piston.
  • the carrier element 43 is rotationally symmetrical and arranged coaxially to the axis 5 and further comprises a ring magnet 39, which is fastened by means of the carrier element 43 to the main piston 11.
  • the PLCD sensor 27 is also aligned coaxially with the axis 5 according to the embodiment shown in Figure 2 and disposed within the cylinder housing 3 so that it dives through the drag piston 19, the main piston 1 1 and the ring magnet 39 therethrough.
  • all moving parts within the cylinder housing is arranged rotationally symmetrical about the sensor 27 around coaxially to the axis 5.
  • a recess 46 is provided in a lower portion 46 of the housing part 37. Within this recess 46, the piston 1 1 extends out of the housing 3.
  • the main piston 11 has at its lower end in Figure 2 a connecting portion 47, by means of which the main piston 1 1 with a (not shown) piston rod can be connected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

L'invention concerne un ensemble piston-cylindre, notamment pour des systèmes pneumatiques, hydrauliques ou mécatroniques, comprenant un carter de cylindre (3) et un piston (11) qui est couplé à une tige de piston, est disposé dans le carter de cylindre (3) et y est disposé de manière mobile le long d'un axe longitudinal. Selon l'invention, un dispositif de mesure (27) est disposé à l'intérieur du carter de cylindre (3).
EP09740258.0A 2009-02-05 2009-09-17 Ensemble piston-cylindre avec dispositif de mesure intégré Active EP2394063B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009007657A DE102009007657A1 (de) 2009-02-05 2009-02-05 Kolben-Zylinderanordnung mit integrierter Messeinrichtung
PCT/EP2009/006708 WO2010088931A1 (fr) 2009-02-05 2009-09-17 Ensemble piston-cylindre avec dispositif de mesure intégré

Publications (2)

Publication Number Publication Date
EP2394063A1 true EP2394063A1 (fr) 2011-12-14
EP2394063B1 EP2394063B1 (fr) 2013-05-29

Family

ID=41382934

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09740258.0A Active EP2394063B1 (fr) 2009-02-05 2009-09-17 Ensemble piston-cylindre avec dispositif de mesure intégré

Country Status (5)

Country Link
US (2) US8997630B2 (fr)
EP (1) EP2394063B1 (fr)
CN (1) CN102301146B (fr)
DE (1) DE102009007657A1 (fr)
WO (1) WO2010088931A1 (fr)

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DE102009007657A1 (de) * 2009-02-05 2010-08-12 Wabco Gmbh Kolben-Zylinderanordnung mit integrierter Messeinrichtung
DE102010002109A1 (de) * 2010-02-18 2011-08-18 ZF Friedrichshafen AG, 88046 Sensoranordnung
US9909601B2 (en) * 2010-11-16 2018-03-06 Illinois Tool Works Inc. Motor control
DE102010055694A1 (de) 2010-12-22 2012-06-28 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Abdeckung für eine Zylinder-Anordnung, Zylinder-Anordnung und automatisches Getriebe
US20120249128A1 (en) * 2011-03-28 2012-10-04 GM Global Technology Operations LLC Magnetic sensor system
DE102014104479A1 (de) * 2014-03-31 2015-10-15 Steinel Normalien Ag Gasdruckfeder
US9476948B2 (en) 2014-04-22 2016-10-25 Gm Global Technology Operations, Llc Automotive magnetic shield
US9547049B2 (en) 2014-04-22 2017-01-17 Gm Global Technology Operations, Llc Automotive magnetic shield
US20170219118A1 (en) * 2016-01-28 2017-08-03 Hamilton Sundstrand Corporation Bleed valve position sensor
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DE102019202883A1 (de) * 2018-11-29 2020-06-04 Robert Bosch Gmbh Hydraulische Steueranordnung und Antriebseinheit
EP3971424A1 (fr) * 2020-09-18 2022-03-23 ZF CV Systems Europe BV Actionneur pneumatique comportant un capteur de position magnétique
WO2023217314A1 (fr) * 2022-05-10 2023-11-16 Schaeffler Technologies AG & Co. KG Actionneur
DE102022004564A1 (de) 2022-12-06 2024-06-06 Bümach Engineering International B.V. Verfahren zur Herstellung eines Arbeitszylinders mit einem Positionssensor

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Also Published As

Publication number Publication date
US20110303085A1 (en) 2011-12-15
DE102009007657A1 (de) 2010-08-12
CN102301146B (zh) 2015-05-06
US20150176615A1 (en) 2015-06-25
CN102301146A (zh) 2011-12-28
US8997630B2 (en) 2015-04-07
US9771958B2 (en) 2017-09-26
WO2010088931A1 (fr) 2010-08-12
EP2394063B1 (fr) 2013-05-29

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