WO2001056862A1 - Servomoteur comportant un piston de travail, en particulier pour directions actionnees par une force exterieure ou auxiliaire de vehicules automobiles - Google Patents

Servomoteur comportant un piston de travail, en particulier pour directions actionnees par une force exterieure ou auxiliaire de vehicules automobiles Download PDF

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Publication number
WO2001056862A1
WO2001056862A1 PCT/EP2001/001071 EP0101071W WO0156862A1 WO 2001056862 A1 WO2001056862 A1 WO 2001056862A1 EP 0101071 W EP0101071 W EP 0101071W WO 0156862 A1 WO0156862 A1 WO 0156862A1
Authority
WO
WIPO (PCT)
Prior art keywords
working piston
cover
actuator according
working
piston
Prior art date
Application number
PCT/EP2001/001071
Other languages
German (de)
English (en)
Inventor
Jürgen BIEBER
Rainer SCHÄNZEL
Axel GÄRTNER
Peter Hirschauer
Original Assignee
Zf Lenksysteme 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 Zf Lenksysteme Gmbh filed Critical Zf Lenksysteme Gmbh
Priority to AU33729/01A priority Critical patent/AU3372901A/en
Publication of WO2001056862A1 publication Critical patent/WO2001056862A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/10—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of power unit
    • B62D5/12—Piston and cylinder
    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • F15B15/1452—Piston sealings

Definitions

  • Servomotor with a working piston, in particular for external and power steering systems for motor vehicles
  • the invention relates to an actuator with a working piston according to the kind defined in the preamble of claim 1.
  • the invention relates to an actuator with a working piston for external or auxiliary power steering, in particular for motor vehicles with a pressure oil pump, a steering valve and a servo cylinder.
  • Servomotors of this type have a servo cylinder in which a working piston connected to a piston rod is guided.
  • a working piston which is to be used in particular for the rack of a power steering rack for a motor vehicle, is known from DE 42 15 074 AI.
  • This working piston is attached to the rack and slides back and forth in a cylinder of a steering housing.
  • the working piston has a seal and a friction ring, which are fastened to a rigid holder between the cylinder and the rack, so that two pressure chambers are separated from one another.
  • the rigid bracket works in conjunction with an elastic device that is mounted around the rod to permanently ensure a smooth and tight contact between the friction ring and the cylinder.
  • the present invention has for its object to present a servomotor with a working piston, in particular for external and power steering systems for motor vehicles, which can compensate for manufacturing and assembly-related tolerances over the service life and thus ensure reliable operation.
  • the working piston be constructed in several parts and have a base body which is firmly connected to a piston rod.
  • the working piston can be connected to the piston rod by reshaping, clamping, gluing, pressing on, joining or only by frictional connection.
  • the base body of the working piston can additionally be fixed on the piston rod by a fastening element and secured against axial and radial displacement.
  • a cover which at least partially covers the base body is designed to be radially movable in order to be able to compensate for tolerances caused by production and assembly.
  • the cover There is a prestressed seal between the cover and the base body, which presses the cover against the housing. If there is a large radial play, the seal can also be spring-loaded to compensate for the play.
  • An improvement in the sliding or sealing properties of the cover can be achieved by coating or introducing surface structures.
  • the base body and cover are preferably produced by forming, which leads to better strength and wear properties.
  • FIG. 1 shows an embodiment of a servomotor with a working piston for power steering and power steering for motor vehicles.
  • Fig. 2 is an enlarged view of the area of the working piston of the embodiment shown in Fig. 1.
  • FIG. 1 shows an auxiliary power steering system for motor vehicles as a first advantageous embodiment of the invention, in which a drive pinion 2 is rotatably mounted in bearings 3 and 4 in a housing 1.
  • a steering spindle connection 5 is located at one end of the drive pinion 2.
  • the drive pinion 2 via its toothing, is in engagement with a toothed rack 6, which is guided in the housing 1 so as to be axially displaceable.
  • the servo cylinder 7 contains two working spaces 11 and 12 in a cylinder 10, which are separated from one another by a working piston 13 fixed on the piston rod 8.
  • the two working spaces 11 and 12 are connected via working lines 14 and 15 to two cylinder ports 16 and 17 of a control valve 18.
  • the control valve 18 also has an inlet connection 20 to which a pressure source 21 in the form of a servo pump is connected.
  • a container 23 is connected to a return connection 22.
  • the working lines 14 and 15 are connected to the cylinder 10 via two connecting parts 24 and 25.
  • 2 shows an enlarged illustration of the working piston 13 in the region of the servo cylinder 7.
  • the working piston 13 has a base body 26 which is fixedly connected to the piston rod 8.
  • the working piston 13 has been formed into a groove 27 of the piston rod 8 in terms of forming technology.
  • This connection of the working piston 13 and the piston rod 8 must be carried out in such a way that the working piston 13 cannot be displaced in the axial and radial directions.
  • the connection of the working piston 13 and the piston rod 8 can also be done by
  • the base body 26 of the working piston 13 can additionally be fixed on the piston rod 8 by a fastening element 30 and secured against axial displacement and radial twisting.
  • a cover 28, which at least partially covers the base body 26, is designed to be radially movable in order to be able to compensate for tolerances. Between the cover 28 and the base body 26 there is a seal 29 which presses the cover 28 against the housing 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Steering Mechanism (AREA)

Abstract

Selon l'invention, dans un servomoteur comportant un servocylindre (7) dont les chambres de travail (11, 12) sont séparées l'une de l'autre par un piston de travail (13), en particulier un servomoteur destiné à une direction actionnée par une force auxiliaire ou extérieure de véhicule automobile, le piston de travail (13) est pourvu d'un corps de base (26) qui est recouvert, au moins partiellement, par un couvercle (28). Entre le corps de base (26) et le couvercle (28) se trouve un joint (29) qui maintient le couvercle (28) sous une précontrainte, de telle sorte que des tolérances de fabrication et de montage peuvent être compensées.
PCT/EP2001/001071 2000-02-05 2001-02-01 Servomoteur comportant un piston de travail, en particulier pour directions actionnees par une force exterieure ou auxiliaire de vehicules automobiles WO2001056862A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU33729/01A AU3372901A (en) 2000-02-05 2001-02-01 Servo motor with a working piston, in particular for power-assisted steering gear for motor vehicles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10005236.3 2000-02-05
DE2000105236 DE10005236A1 (de) 2000-02-05 2000-02-05 Stellmotor mit einem Arbeitskolben, insbesondere für Fremd- und Hilfskraftlenkungen für Kraftfahrzeuge

Publications (1)

Publication Number Publication Date
WO2001056862A1 true WO2001056862A1 (fr) 2001-08-09

Family

ID=7630036

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/001071 WO2001056862A1 (fr) 2000-02-05 2001-02-01 Servomoteur comportant un piston de travail, en particulier pour directions actionnees par une force exterieure ou auxiliaire de vehicules automobiles

Country Status (3)

Country Link
AU (1) AU3372901A (fr)
DE (1) DE10005236A1 (fr)
WO (1) WO2001056862A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2854856A1 (fr) * 2003-05-13 2004-11-19 Koyo Steering Europe Kse Ensemble piston de verin de direction assistee hydraulique

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6719298B2 (en) * 2002-01-14 2004-04-13 Skf Usa Inc. Bonded piston seal for power steering
FR2855142B1 (fr) * 2003-05-20 2006-05-05 Koyo Steering Europe Kse Ensemble piston pour verin de direction assistee hydraulique
US7240606B2 (en) 2004-07-15 2007-07-10 Parker-Hannifin Corporation Crimped piston to rod joint
DE602006021531D1 (de) * 2006-02-17 2011-06-09 Magneti Marelli Spa Hydraulischer Aktuator für einen Servomotor zum Schalten von Gängen und zugehöriges Herstellungsverfahren

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5945267A (ja) * 1982-09-08 1984-03-14 Nissan Motor Co Ltd パワ−ステアリング装置
DE4215074A1 (de) 1991-05-07 1992-11-12 Peugeot Kolben, insbesondere fuer die stange einer zahnstange einer servolenkung fuer ein kraftfahrzeug
EP0737610A2 (fr) * 1995-04-15 1996-10-16 TRW Fahrwerksysteme GmbH & Co. KG Direction à crémaillère hydraulique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5945267A (ja) * 1982-09-08 1984-03-14 Nissan Motor Co Ltd パワ−ステアリング装置
DE4215074A1 (de) 1991-05-07 1992-11-12 Peugeot Kolben, insbesondere fuer die stange einer zahnstange einer servolenkung fuer ein kraftfahrzeug
EP0737610A2 (fr) * 1995-04-15 1996-10-16 TRW Fahrwerksysteme GmbH & Co. KG Direction à crémaillère hydraulique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 148 (M - 308) 11 July 1984 (1984-07-11) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2854856A1 (fr) * 2003-05-13 2004-11-19 Koyo Steering Europe Kse Ensemble piston de verin de direction assistee hydraulique

Also Published As

Publication number Publication date
AU3372901A (en) 2001-08-14
DE10005236A1 (de) 2001-09-06

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