EP0353117B2 - Vorrichtung zur Messung der Stellung eines beweglichen Gliedes innerhalb eines festen Gliedes - Google Patents

Vorrichtung zur Messung der Stellung eines beweglichen Gliedes innerhalb eines festen Gliedes Download PDF

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Publication number
EP0353117B2
EP0353117B2 EP89401847A EP89401847A EP0353117B2 EP 0353117 B2 EP0353117 B2 EP 0353117B2 EP 89401847 A EP89401847 A EP 89401847A EP 89401847 A EP89401847 A EP 89401847A EP 0353117 B2 EP0353117 B2 EP 0353117B2
Authority
EP
European Patent Office
Prior art keywords
movable
stationary
booster
housing
rod
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.)
Expired - Lifetime
Application number
EP89401847A
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English (en)
French (fr)
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EP0353117B1 (de
EP0353117A1 (de
Inventor
Roland Levrai
Pascal Le Normand
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.)
AlliedSignal Europe Services Techniques
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AlliedSignal Europe Services Techniques
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Publication date
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Application filed by AlliedSignal Europe Services Techniques filed Critical AlliedSignal Europe Services Techniques
Publication of EP0353117A1 publication Critical patent/EP0353117A1/de
Publication of EP0353117B1 publication Critical patent/EP0353117B1/de
Application granted granted Critical
Publication of EP0353117B2 publication Critical patent/EP0353117B2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present invention relates to a device for detecting the position of a movable member inside a fixed member which surrounds it, and more particularly to a piston means of a pneumatically actuated servomotor, inside of this servo motor.
  • Such amplifying devices are commonly constituted by pneumatic servomotors comprising a housing divided into a front chamber and a rear chamber by means of piston displaceable from a rest position close to the rear wall of the housing. These pneumatic actuators have fully satisfactory operation.
  • Document FR-A-2509883 discloses a declutching assistance servomotor comprising a meter for measuring the position of the stroke of the servomotor, consisting of a conductive strip extending in the direction of this stroke, and a socket carried by the movable rod of the booster, the conductive strip and the socket together forming a linear potentiometer delivering a measurement signal to control the operation of the booster.
  • the measurement lever is integrated in the casing of the booster, which requires the latter to be of a special and relatively complex design, prohibiting its use on servomotors of conventional design.
  • Also known from document EP-A-0 160 586 is a measuring device in accordance with the preamble of claim 1, from document DE-C-3 226 579 the mounting of a member in an opening of a housing by insertion in a seal itself placed in this opening, by document DE-A-3 731 603 the use of a potentiometer on a servomotor, and by document DE-A-2 628 204 a check valve vacuum on the side of the front chamber of a servomotor.
  • the object of the invention is to propose a device for measuring the position of the piston means in a pneumatically actuated servomotor, which is adaptable to actuator housings of known type without modification of the latter.
  • the invention provides a device for measuring the position of a movable member with respect to a fixed member, the fixed member being one of the walls of a booster housing and the movable member being a means of piston dividing the housing into a front chamber and a rear chamber, comprising a first movable means displaceable with the movable member and the displacement of which is identified with respect to a second fixed means with respect to the fixed member, the first sliding movable means relative to the second fixed means so as to vary at least one electrical quantity as a function of the position of the first movable means relative to the second fixed means, the second fixed means being inserted in leaktight manner by means of an elastic seal in a formed opening in the fixed member so as to remain outside the booster housing, and the first movable means being applied to the piston means by means of a spring, characterized in that that the first movable means and the second fixed means together constitute a potentiometer and in that the second fixed means is inserted on the side of the vacuum chamber before the servomotor
  • a detection device 10 fixed on a servomotor 12.
  • This servomotor is constituted in a known manner by a housing 14 internally divided by a piston means 16 into two chambers 18 and 20 selectively intercommunicating.
  • the housing 14 has an opening 22 into which the detection device 10 is inserted in a leaktight manner by means of an elastic seal 24.
  • the detection device 10 mainly consists of a body 26 of electrically conductive material, and of cylindrical shape, of which a part 28 of reduced diameter is provided on its periphery with annular grooves 30, the part 28 being able to engage in the seal 24 in leaktight manner, the grooves 30 forming in a known manner a system for retaining the device 10 in the seal 24.
  • the body 26 is provided with a bore 32 into which opens another bore 34, of smaller diameter formed in the part 28 of reduced diameter.
  • an electrically insulating sleeve 36 In the bore 32 is introduced an electrically insulating sleeve 36, and in the bore 34 is introduced a ring 38, electrically conductive, and of the same internal diameter as that of the sleeve 36, so as to define a continuous bore 40.
  • a rod 42 made of electrically conductive material, extending outside of the part 28, and therefore inside from chamber 18, to the piston means 16.
  • the rod 42 is held in contact with the piston means 16 by spring 44, bearing on one side on the ring 38, and on the other on a shoulder 46 formed at the end of the rod 42.
  • This rod has longitudinal grooves 48, connecting the chamber 18 and the interior of the bore 40.
  • the end of the rod 42 penetrating into the bore 40 carries an elastic metal tongue 54, capable of rubbing on the track 52, so as to form a movable contact between the rod 42 and the track 52.
  • the rod 42 also comprises, in the vicinity of the tongue 54, a finger 56, penetrating into the groove 50, and serving both to immobilize in rotation the rod 42 relative to the sleeve 36, and to form a stop preventing the rod 42 from coming out of the bore 40 under the effect of spring 44.
  • the body 26 is finally closed in a leaktight manner, at its end opposite to that which is fixed to the housing 14, by a plug 58 provided with a passage 60 for a conductive wire 62 electrically connected to the end closest to the track 52.
  • the rod 42 moves at the same time as the piston means 16 thanks to the spring 44 now still applied to it by one of its ends.
  • the other end consequently displaces the elastic tongue 54 on the track 52.
  • the electrical circuit formed by the wire 62, the track 52, the tongue 54, the rod 42, the ring 38 and the body 26 therefore has a variable electrical resistance. as a function of the position of the piston means 16 thanks to the potentiometric track 52.
  • An appropriate electronic circuit connected to the terminals of this variable resistance will therefore provide a signal representative of the position of the piston means 16 inside the booster housing , this signal can be used to control other devices or for signaling purposes.
  • the device for detecting the position of the piston means is mounted in an opening already made in the booster housing and necessary for its operation, connected to a vacuum source.
  • the body 26 of the device 10 is provided laterally with a hollow extension 70.
  • An opening 72 is made in the body 26 so as to communicate the interior of the bore 32 with the interior of the extension 70, the sleeve 36 having also an opening 74 allowing communication between the interior of the bore 40 with the interior of the extension 70.
  • On the extension 70 can be fixed a hollow nozzle 76 allowing connection to a pneumatic pipe (not shown).
  • a pneumatic pipe not shown.
  • Such a valve can advantageously be integrated into the detection device 10, the opening 72 constituting a first valve means by its edges 78 forming the seat of a second valve means 80, held in the rest position by a return spring 82 supported by its other end on the nozzle 76.
  • the invention provides a means of knowing at all times the position of the piston means in a booster without any modification of the latter, and therefore applicable to any type of existing booster.
  • the body of the device can be made of molded plastic, the electrical contacts being made by crossings of sealed wires.
  • the device of the invention can be simplified, as well as the associated electronic circuit.
  • the track 52 is discontinuous, that is to say formed of conductive pads arranged at appropriate distances corresponding to the positions to be identified, each pad being connected to an external electrical contact and therefore giving all or nothing the information of the passage of the piston means through a predetermined position, for example start of travel, intermediate position and end of travel.
  • the end of the rod which enters the bore 40 may be provided with a permanent magnet, while flexible blade switches will be buried at different locations in the body 26 or the sleeve 36 and actuated by the passage of the permanent magnet at their level. It is also possible to provide for a winding or solenoid coaxially with the bore 40, the rod 42 then acting as a plunger and modifying the inductance of the winding, which can be measured at its terminals.
  • the invention is applicable to any type of booster, for braking assistance, declutching, whether simple or in tandem.
  • a brake booster it could for example be provided that the start of race contact activates brake warning lights ("stop" lights), one or more intermediate position contacts act on an anti-lock system wheels, and the limit switch signals excessive wear on the brake linings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Braking Systems And Boosters (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Claims (4)

  1. Vorrichtung (10) zum Messen der Position eines beweglichen Elements (16) in bezug auf ein feststehendes Element (14), wobei das feststehende Element eine der Wände eines Gehäuses (14) eines Servomotors und das bewegliche Element ein Kolbenmittel (16) ist, das das Gehäuse in eine vordere Kammer (18) und eine hintere Kammer (20) teilt, mit einem ersten, beweglichen Mittel (42), das mit dem beweglichen Element (16) verstellbar ist und dessen Verstellung in bezug auf ein zweites, feststehendes Mittel (26) bezüglich des feststehenden Elements (14) definiert ist, wobei das erste, bewegliche Mittel (42) bezüglich des zweiten, feststehenden Mittels (26) so gleitet, daß es in Abhängigkeit von der Position des ersten, beweglichen Mittels (42) in bezug auf das zweite, feststehende Mittel (26) die Veränderung wenigstens einer elektrischen Größe bewirkt, wobei das zweite, feststehende Mittel (26) mittels einer elastischen Dichtung(24) abgedichtet in eine im feststehenden Element (14) ausgebildete Öffnung (22) so eingesetzt ist, daß es außerhalb des Gehäuses (14) des Servomotors bleibt, und wobei das erste, bewegliche Mittel (42) mittels einer Feder (44) auf das Kolbenmittel (16) gedrückt wird, dadurch gekennzeichnet, daß das erste, bewegliche Mittel (42) und das zweite, feststehende Mittel (26) zusammen ein Potentiometer bilden und daß das zweite, feststehende Mittel (26) auf der Seite der vorderen Unterdruckkammer (18) des Servomotors eingesetzt und seitlich mit einem hohlen Ansatz (70) versehen ist, der ein Vakuum-Rückschlagventil enthält.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Potentiometer linear ist.
  3. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sie ein System zum Einstellen der Länge des ersten, beweglichen Mittels (42) enthält.
  4. Pneumatischer Servomotor, dadurch gekennzeichnet, daß er mit einer Meßvorrichtung (10) nach einem der Ansprüche 1 bis 3 ausgerüstet ist.
EP89401847A 1988-07-22 1989-06-28 Vorrichtung zur Messung der Stellung eines beweglichen Gliedes innerhalb eines festen Gliedes Expired - Lifetime EP0353117B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8809908A FR2634524A1 (fr) 1988-07-22 1988-07-22 Dispositif de detection de la position d'un organe mobile a l'interieur d'un organe fixe
FR8809908 1988-07-22

Publications (3)

Publication Number Publication Date
EP0353117A1 EP0353117A1 (de) 1990-01-31
EP0353117B1 EP0353117B1 (de) 1991-12-11
EP0353117B2 true EP0353117B2 (de) 1994-04-27

Family

ID=9368665

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89401847A Expired - Lifetime EP0353117B2 (de) 1988-07-22 1989-06-28 Vorrichtung zur Messung der Stellung eines beweglichen Gliedes innerhalb eines festen Gliedes

Country Status (6)

Country Link
US (1) US4978820A (de)
EP (1) EP0353117B2 (de)
JP (1) JP2867042B2 (de)
DE (1) DE68900537D1 (de)
ES (1) ES2027458T5 (de)
FR (1) FR2634524A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3939978A1 (de) * 1989-12-02 1991-06-06 Teves Gmbh Alfred Unterdruck-bremskraftverstaerker
DE4036744A1 (de) * 1990-11-17 1992-05-21 Teves Gmbh Alfred Unterdruck-bremskraftverstaerker
FR2670882B1 (fr) * 1990-12-20 1994-05-20 Bendix Europe Services Technique Dispositif de mesure de la position d'une tige de poussee d'un servomoteur pneumatique.
DE4116779C2 (de) * 1991-05-23 2000-08-10 Continental Teves Ag & Co Ohg Unterdruck-Bremskraftverstärker
DE4140065A1 (de) * 1991-12-05 1993-06-09 Alfred Teves Gmbh, 6000 Frankfurt, De Unterdruck-bremskraftverstaerker
DE4410699C2 (de) * 1994-03-28 2001-10-04 Continental Teves Ag & Co Ohg Hydraulische Bremsanlage für Kraftfahrzeuge
DE4418444C2 (de) * 1994-05-26 1999-01-14 Lucas Ind Plc Elektronisch regelbarer Bremskraftverstärker für eine Fahrzeugbremsanlage

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR715369A (fr) * 1930-08-11 1931-12-02 Contacteur automatique de batterie et démarrage pour moteurs de véhicules automobiles
US1961004A (en) * 1932-02-10 1934-05-29 Leon A Lemaitre Pressure controlled switch
US2386179A (en) * 1943-03-10 1945-10-09 Foscoe H Andrus Positioning indicator for engine pistons
US2987714A (en) * 1957-09-30 1961-06-06 Ohio Commw Eng Co Speed signal device operated from oil pressure line
AT312319B (de) * 1967-12-30 1973-12-27 Joseph Anton Bachmann Vorrichtung zur Stellwegmessung bei einer Kolben-Zylinder-Einheit von Werkzeugmaschinen od.dgl.
US3546667A (en) * 1968-10-25 1970-12-08 Edward M Thomas Hydraulic brake system
FR2289781A1 (fr) * 1974-10-29 1976-05-28 Jouvenel & Cordier Dispositif de controle de fin de course de verins
JPS5211350A (en) * 1975-07-10 1977-01-28 Nissan Motor Co Ltd Automatic clutch controller by electronics
JPS54101062A (en) * 1978-01-26 1979-08-09 Aisin Seiki Co Ltd Hydraulic pressure control system for multi-system brake
US4206455A (en) * 1978-06-09 1980-06-03 Midland-Ross Corporation Piston overtravel indicator
DE2945895C2 (de) * 1979-11-14 1986-06-05 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Magnetischer Stellungsgeber für hydrauliche oder pneumatische Arbeitszylinder
DE3128486A1 (de) * 1981-07-18 1983-01-27 Pierburg Gmbh & Co Kg, 4040 Neuss "verfahren und vorrichtung zur steuerung eines pneumatisch betriebenen servomotors"
JPS60206765A (ja) * 1984-03-30 1985-10-18 Aisin Seiki Co Ltd 車両のブレ−キ装置

Also Published As

Publication number Publication date
US4978820A (en) 1990-12-18
DE68900537D1 (de) 1992-01-23
EP0353117B1 (de) 1991-12-11
ES2027458T3 (es) 1992-06-01
FR2634524A1 (fr) 1990-01-26
JPH02262460A (ja) 1990-10-25
ES2027458T5 (es) 1995-08-16
EP0353117A1 (de) 1990-01-31
JP2867042B2 (ja) 1999-03-08

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