EP0258279A1 - Verin a capteur electrique de la position terminale du piston. - Google Patents

Verin a capteur electrique de la position terminale du piston.

Info

Publication number
EP0258279A1
EP0258279A1 EP87900648A EP87900648A EP0258279A1 EP 0258279 A1 EP0258279 A1 EP 0258279A1 EP 87900648 A EP87900648 A EP 87900648A EP 87900648 A EP87900648 A EP 87900648A EP 0258279 A1 EP0258279 A1 EP 0258279A1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
end position
end wall
working cylinder
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
EP87900648A
Other languages
German (de)
English (en)
Other versions
EP0258279B1 (fr
Inventor
Gerhard Bruggen
Manfred Gaugler
Dieter Karr
Josef Winkler
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.)
OFFERTA DI LICENZA AL PUBBLICO
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0258279A1 publication Critical patent/EP0258279A1/fr
Application granted granted Critical
Publication of EP0258279B1 publication Critical patent/EP0258279B1/fr
Expired legal-status Critical Current

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
    • F15B15/26—Locking mechanisms
    • 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

Definitions

  • the invention relates to a cylinder according to the preamble of claim 1.
  • Arrangements of this type are already known. They are designed as single- or double-acting cylinders, the pistons of which can be acted upon by liquids or gases, in particular compressed air.
  • the inlet and the outlet of the pressure medium are controlled so that when the piston reaches the stroke end position, the previous inlet closes and the outlet opens.
  • Various possibilities are known for measuring and determining the position of the piston of a working cylinder, in particular the reaching of the piston end position.
  • all of these known arrangements are relatively complex, prone to failure and inaccurate.
  • a working cylinder which has become known from DE-PS 30 14 331 uses a diaphragm made of stainless steel, welded to the end wall of the cylinder, as the end-position sensor, with which a 3 actuation body carried by the piston is axially aligned. The deformation of the membrane is over one sensor located half of the cylinder space converted into a position signal.
  • DE-OS 32 21 574 is concerned with a cylinder with an integrated electrical signal transmitter, which in one embodiment has two insulated electrical conductors which are kept at different electrical potentials and touch the piston surface made of conductive material in the stroke end position.
  • the working cylinder according to the invention with the characterizing features of claim 1 has the advantage that it can do with a compact design without moving parts for the detection of the piston end position. If the work area is sealed off, a piston end position with precise response time is achieved, which functions reliably even under harsh operating conditions, at high pressures and temperatures and is practically wear-free. In addition, an external voltage source for indicating the piston end position is unnecessary.
  • the specified working cylinder can also be further developed as a piezohydraulic or piezopneumatic actuating element, which is characterized by large travel ranges, short actuation times and large power transmission.
  • the supply line for a pressure medium acting on the piston opens into the cylinder end wall, which is closed in the stroke end position by part of the end face of the piston, that the piston is held in its stroke end position by a force which is greater than that on the partial area of the piston acting force of the pressure medium, and that in the cylinder end wall is connected to a voltage source connectable piezoelectric transducer which expands in the direction of displacement of the piston after application of the voltage and its end face lifts from the cylinder end wall.
  • a common piezoelectric transducer is provided according to an advantageous embodiment of the invention.
  • This transducer is expediently designed as a cylindrical body which is inserted into a bore in the cylinder end wall which extends in the direction of movement of the piston.
  • FIG. 1 An embodiment of the invention is shown in the drawing and explained in more detail in the following description with further advantages.
  • the figure shows a schematically represented working cylinder with the associated control devices in a longitudinal section.
  • the drawing shows a working cylinder 1 with a piston 2, which is acted upon on both sides and can be moved back and forth over a linear stroke distance, and which can be reversed after reaching its end positions.
  • the cylinder 1 is closed on both sides by a cylinder cover 3 or 4 pressure-tight.
  • the cylinder covers are shown in one piece with the working cylinder 1.
  • the piston 2 has a piston rod 5 which is guided to the outside through a bore in the cover 3 provided with a seal 6.
  • the pressure medium is fed to the cylinder interior via lines 7 and 8 formed in the cylinder covers 3, 4.
  • the lines are in the area of the facing end walls of the cylinder covers as annular spaces 9 and 10 trained, with which located on the end faces of the piston 2 sealing rings 11 and 12 cooperate.
  • return lines 13 and 1 4 are provided, which open near the end walls of the cylinder covers 3 and 4 into the cylinder chamber.
  • the lines contain a control slide 16 which can be actuated by an electromagnet 15. Depending on the position of this slide, either the feed line 8 and the drain line 14 or the feed line 7 and the drain line 13 are released.
  • the signal for switching the control slide 16 is generated by piston end position sensors which are arranged in or on the cylinder covers 3, 4 and are actuated by the piston 2 in the stroke end positions.
  • Endst elungsgeber serve piezoelectric transducers 17 and 18. These are formed in the embodiment as a cylindrical hollow body, which are inserted in a centrally arranged and extending in the direction of movement of the piston bore 19 and 20 of the cover 3 and 4, respectively. In the unloaded state, the hollow bodies protrude a few micrometers above the end wall of the cover.
  • the hollow body 17 is penetrated by the piston rod 5.
  • Each transducer consists of several stacked piezoelectric perforated disks, which are arranged in an insulating housing. The disks are electrically connected in parallel. Each transducer is connected to the electromagnet 15 via a line 21 or 22 which leads to the outside.
  • the piston 2 is held in its respective end stroke position by a force which is greater than that on the surface which closes the annular space 9 or 10 of the feed lines 7 or 8 , lubden sealing rings 11 and 12 acting force of the pressure medium.
  • this force is applied by permanent magnet rings 23, 24, which are fastened in one turn 25, 26 of the cylinder covers 3 and 4, respectively.
  • the end faces of the magnetic rings are flush with the end wall of the cylinder cover.
  • the magnetic rings 23, 24 are each opposed by a soft iron ring 27 or 28, which is anchored in the piston 2.
  • the converters 17, 18 can be alternately connected to voltage via the lines 21, 22.
  • the piezoelectric disks expand under the influence of the applied electric field with simultaneous contraction of their diameters in the direction of the cylinder's longitudinal axis, so that the piston 2 is lifted off the end wall of the cylinder cover.
  • the piston 2 is in its left stroke end position. It is held on the end wall of the cylinder cover 4 by the magnetic field of the ring magnet 24.
  • the pressure line 8 is open so that the force of the pressure medium is applied to the sealing ring 12 of the piston 2. This force is less than the magnetic holding force.
  • the piezoelectric transducer 18 now receives an electrical voltage pulse via the line 22, it expands and lifts the piston 2 while simultaneously opening the sealing seat 10, 12 somewhat from the end wall of the cylinder cover 4.
  • the pressure of the pressure medium supplied through line 8 now acts on the entire piston surface, ie the hydraulic or. Pneumatic pressure becomes greater than the magnetic holding force.
  • the piston consequently moves into the right stroke end position, the pressure medium on the right side of the piston being pressed out via the return line 13.
  • the return line Shortly before reaching the right end position, the return line is closed by the piston and the piston speed is slowed down somewhat.
  • the piezoelectric transducer 17 experiences a deformation.
  • the electrical signal generated thereby is given to the electromagnet 15 via the line 21 and an intermediate amplifier. This transfers the control slide 16 into its other end position, in which the return line 14 and the pressure line 7 are open, but the lines 8 and 13 are closed.
  • the trigger pulse for the movement of the piston 2 in the reverse direction can then be input by applying an electrical voltage to the converter 17.
  • the influence of temperature-related changes in size of the piezoelectric transducers can be compensated for by applying a direct voltage to the piezoceramic.
  • the superimposed alternating voltage signal which is generated by the compression of the converter when the piston strikes the end wall of one of the cylinder covers 3, 4, is used as the manipulated variable for the electromagnet 15.

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

Un vérin (1, 3, 4) ayant un capteur électrique de la position terminale du piston est construit comme un transformateur piézoélectrique (17 resp. 18). Lorsque l'on applique une tension au transformateur piézoélectrique (17 resp. 18), celui-ci devient un organe d'entraînement qui surmonte une force de retenue du piston (2) dans sa position de fin de course et éloigne le piston (2) de la position où il bloque le canal d'admission (7 resp. 8) du milieu sous pression.
EP87900648A 1986-02-08 1987-01-14 Verin a capteur electrique de la position terminale du piston Expired EP0258279B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863603992 DE3603992A1 (de) 1986-02-08 1986-02-08 Arbeitszylinder mit einem elektrischen kolbenendstellungsgeber
DE3603992 1986-02-08

Publications (2)

Publication Number Publication Date
EP0258279A1 true EP0258279A1 (fr) 1988-03-09
EP0258279B1 EP0258279B1 (fr) 1989-09-27

Family

ID=6293698

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87900648A Expired EP0258279B1 (fr) 1986-02-08 1987-01-14 Verin a capteur electrique de la position terminale du piston

Country Status (5)

Country Link
US (1) US4843951A (fr)
EP (1) EP0258279B1 (fr)
JP (1) JPH0776563B2 (fr)
DE (2) DE3603992A1 (fr)
WO (1) WO1987004763A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5055733A (en) * 1990-09-17 1991-10-08 Leonid Eylman Method for converting micromotions into macromotions and apparatus for carrying out the method
US5259345A (en) * 1992-05-05 1993-11-09 North American Philips Corporation Pneumatically powered actuator with hydraulic latching
DE9305640U1 (de) * 1993-04-15 1994-08-25 Hydraulik Techniek, Emmen Druckmittelbetätigter Arbeitszylinder
DE4411569C1 (de) * 1994-04-02 1995-07-20 Itw Dynatec Gmbh Klebetechnik Auftragskopf zur dosierten Abgabe von strömenden Medien
US6736614B1 (en) * 1999-04-19 2004-05-18 Leybold Vakuum Gmbh Rotary piston drive mechanism
GB0008281D0 (en) * 2000-04-04 2000-05-24 Boc Group Plc Improvements in reciprocating machines
US8413572B1 (en) 2006-11-22 2013-04-09 Westendorf Manufacturing, Co. Auto attachment coupler with abductor valve
CN103775421B (zh) * 2013-07-13 2016-03-16 合肥工业大学 自测活塞移动量式液压缸及其使用方法
CA2833663A1 (fr) * 2013-11-21 2015-05-21 Westport Power Inc. Detection de fin de course dans un moteur hydraulique
DE112018007603A5 (de) * 2018-05-15 2021-07-01 Gkn Automotive Ltd. Aktuator und Betätigungs- und Schmiermittelversorgungssystem für ein Kraftfahrzeug

Family Cites Families (14)

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Publication number Priority date Publication date Assignee Title
DE873209C (de) * 1951-03-22 1953-04-13 Fritz Gruender Einrichtung fuer druckmittelbetriebene Anlagen
US2975119A (en) * 1958-12-05 1961-03-14 Clarence D Emmons Vertical rod drive mechanism
US2983922A (en) * 1959-04-27 1961-05-16 Senco Products Portable stapler with pneumatic drive and return
US3027876A (en) * 1960-12-05 1962-04-03 Strick Rudolf Paul Fluid motor with sequence valve
FR1306756A (fr) * 1961-09-08 1962-10-19 Electronique Appliquee Dispositif à céramique piézo-électrique
US3598506A (en) * 1969-04-23 1971-08-10 Physics Int Co Electrostrictive actuator
DE2052763A1 (de) * 1970-10-28 1972-05-04 Schmersal & Co K A Elektrische Schaltvorrichtung zur Umwandlung der Position eines mechanischen Gebers in ein elektrisches Signal, insbesondere Endschalter
DE2130221A1 (de) * 1971-06-18 1972-12-21 Philips Nv Piezoelektrische Zuendvorrichtung
DE3014331C2 (de) * 1980-04-15 1982-03-11 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Arbeitszylinder mit einem Kolbenendstellungsgeber
DE3037380A1 (de) * 1980-10-03 1982-05-13 Carl Schenck Ag, 6100 Darmstadt Hydraulischer druckerzeuger und/oder druckmittelversorgungsanordnung
JPS57167506A (en) * 1981-04-06 1982-10-15 Takeshi Kuroda Hydraulic pressure cylinder
DE3221574A1 (de) * 1982-06-08 1983-12-08 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Zylinder mit integrierter elektrischer signalgabe
DE3237258C1 (de) * 1982-10-08 1983-12-22 Daimler-Benz Ag, 7000 Stuttgart Elektrisch vorgesteuerte Ventilanordnung
DE3425290A1 (de) * 1984-07-10 1986-01-16 Atlas Fahrzeugtechnik GmbH, 5980 Werdohl Piezokeramische ventilplatte und verfahren zu deren herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8704763A1 *

Also Published As

Publication number Publication date
WO1987004763A1 (fr) 1987-08-13
DE3760634D1 (en) 1989-11-02
JPS63502296A (ja) 1988-09-01
DE3603992A1 (de) 1987-08-20
JPH0776563B2 (ja) 1995-08-16
EP0258279B1 (fr) 1989-09-27
US4843951A (en) 1989-07-04

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