WO1987002319A2 - Soupape a tiroir rotatif, en particulier pour servo-directions de vehicules a moteur - Google Patents

Soupape a tiroir rotatif, en particulier pour servo-directions de vehicules a moteur Download PDF

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Publication number
WO1987002319A2
WO1987002319A2 PCT/EP1986/000576 EP8600576W WO8702319A2 WO 1987002319 A2 WO1987002319 A2 WO 1987002319A2 EP 8600576 W EP8600576 W EP 8600576W WO 8702319 A2 WO8702319 A2 WO 8702319A2
Authority
WO
WIPO (PCT)
Prior art keywords
rotary slide
slide valve
spring
centering
rotary
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.)
Ceased
Application number
PCT/EP1986/000576
Other languages
German (de)
English (en)
Other versions
WO1987002319A3 (fr
Inventor
Werner Breitweg
Wolfgang Walter
Hans Schwarz
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 Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
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 Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of WO1987002319A2 publication Critical patent/WO1987002319A2/fr
Publication of WO1987002319A3 publication Critical patent/WO1987002319A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • B62D5/08—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 steering valve used
    • B62D5/083—Rotary valves

Definitions

  • Rotary slide valve in particular for power steering systems of motor vehicles
  • the invention relates to a rotary slide valve, in particular for power steering systems of motor vehicles, according to the preamble of claim 1.
  • Such a rotary slide valve is included, for example, in a hydraulic power steering system, which is described in DE-PS 29 13 484.
  • two steering spindle parts which carry a rotary valve or a control sleeve, are connected to each other by a torsion bar.
  • a torsion bar By changing the characteristics of the torsion bar, different characteristics of the rotary valve can be achieved.
  • a reaction piston is arranged in a bore of a threaded spindle, which has zigzag inclined surfaces that run parallel to corresponding inclined surfaces of the first steering spindle part.
  • Several balls are arranged between the inclined surfaces.
  • the inclined surfaces of the two parts are pressed together by a centering spring which counteracts an axial displacement of one of the two parts relative to the other part when the two parts are rotated relative to one another. This results in a centering that acts precisely in both steering directions.
  • this device can only be realized with rotary valve with a large diameter if the parts supporting the inclined surfaces must be arranged together with the torsion bar in the interior of the rotary valve. If the torsion bar is not to be arranged inside the rotary valve, it must be provided axially thereafter. This results in a very long length of the control rotary slide device. Here, too, there must be a large diameter of the control sleeve connected to the threaded spindle in the known case.
  • the zigzag-shaped inclined surfaces require a great deal of production effort, in particular because exact tolerances have to be observed.
  • the invention has for its object to provide a rotary slide valve with a centering device that is compact in construction, both in terms of the axial and the radial dimensions.
  • the rotary slide valve, in particular the centering device should be simple and inexpensive to manufacture.
  • the adjustability between the hydraulic center of the rotary slide valve and the mechanical centering should be easily possible.
  • the leaf spring-like centering spring which is attached to one of the two relatively rotatable parts of the rotary slide valve and the other of the two relatively rotatable parts have depressions between which a rolling element is held. Due to the mutually V-shaped flanks of the depressions, a precisely determinable centering force and a safe return is achieved in connection with the centering spring even when there is friction between the rotary valve and the control sleeve.
  • the centering spring is expediently fastened to the rotary slide valve by a type of clamp connection.
  • the second of the depressions is arranged on an end face of the control sleeve.
  • the centering spring is formed in a meandering manner on its leaf spring-shaped part, different centering forces can be realized in a simple manner by certain configurations of the spring.
  • the rolling element is designed as a ball, at least one of the depressions is expediently conical or in the form of a spherical cap.
  • FIG. 3 is a partial view of the rotary slide valve according to arrow III in FIG. 1 with a partial section
  • Fig. 4 is a partial view of Fig. 3 with the rotary valve rotated.
  • the rotary slide valve has two parts which can be rotated relative to one another, a control sleeve 1 and a rotary slide 2 which is rotatably mounted therein.
  • the rotary slide 2 is connected to the control sleeve 1 via a torsion bar spring 3.
  • the rotary valve 2 is connected, for example, to a steering spindle connection, and the control sleeve 1 to a steering worm.
  • a centering device 4 has a centering spring 5 in the form of a leaf spring.
  • the centering spring 5 then has clamp-shaped extensions 6 and 7 on its leaf spring-shaped part, by means of which it is fastened to a cylindrical extension 8 of the rotary valve 2.
  • the centering spring 5 is formed in its leaf spring-shaped part with a meandering cross section.
  • the free end of the leaf spring-shaped part is formed parallel to an end face 9 of the control sleeve 1.
  • a recess 10 or 11 is arranged at the free end of the leaf spring-shaped part of the centering spring 5 and on the end face 9 of the control sleeve 1.
  • the two depressions 10 and 11 have a substantially V-shaped cross section.
  • a rolling element 12 is held, which is designed as a ball in the embodiment.
  • one of the depressions 10 and 11 is conical, as shown in FIG. 3.
  • the recess it is also possible to design the recess as a spherical cap instead of the conical recess 10 or 11, the radius of which is larger than the radius of the ball 12.
  • the torsion bar spring 3 When the rotary valve 2 is rotated relative to the control sleeve 1, the torsion bar spring 3 is rotated and generates a mechanical reaction force. At the same time, the depressions 10 and 11 are also adjusted relative to one another. The opposing oblique centering surfaces 10A and 11A of the depressions 10 and 11 move towards one another in the circumferential direction of the control sleeve 1. As a result, the oblique centering surfaces 10A and 11A are pressed apart in the axial direction by the ball 12, as is shown schematically in FIG. 4.
  • the axial relative displacement of the oblique centering surfaces 10A and 11A causes a compression of the centering spring 5 and a resulting axial force between the oblique centering surfaces 10A, 11A and the ball 12. Via the oblique centering surfaces 10A and ILA, the axial restoring force is converted into a centering force which is in The circumferential direction of the rotary valve 2 acts.
  • a rotary slide valve presents a rotary slide (2) rotatably mounted in a control bush (1). Both parts are linked to each other by a torsion bar spring (3). A centering means (4) connected side by side with the torsion bar spring (3) acts upon the rotary siide (2). A centering spring (5) is formed therefor as a leaf spring attached to a cylindrical extension (8) of the rotary slide (2).
  • the control bush (1) presents a conical recess (11) on its front face. A correspond- ing recess (10) is formed in the leaf spring part of the centering spring (5). A ball (12) is retained between both recesses (10, 11).
  • a rotary slide valve has a rotary slide valve (2) rotatably mounted in a control sleeve (1). Both parts are connected to each other by a torsion bar spring (3).
  • a centering device (4) acts on the rotary valve (2) in parallel with the torsion bar spring (3).
  • a centering spring (5) is designed like a leaf spring and fastened to a cylindrical extension (8) of the rotary valve (2).
  • the control sleeve (1) has a conical depression (11) on one end face (9) thereof.
  • a corresponding recess (10) is provided in the leaf spring-like part of the centering spring (5).
  • a ball (12) is held between the two depressions (10, 11).

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

Une soupape à tiroir rotatif présente un tiroir rotatif (2) monté de façon rotative dans une douille de commande (1). Les deux parties sont reliées par un ressort à barre de torsion (3). Un dispositif de positionnement au centre (4) connecté parallèlement au ressort à barre de torsion (3) agit sur le tiroir rotatif (2). A cet effet, un ressort de centrage à lames (5) est fixé à un prolongement cylindrique (8) du tiroir rotatif (2). La douille de commande (1) est pourvue sur sa surface frontale (9) d'un évidement conique (11). Un évidement correspondant (10) est formé dans la partie à lames du ressort de centrage (5). Une bille (12) est retenue entre les deux évidements (10, 11).
PCT/EP1986/000576 1985-10-21 1986-10-08 Soupape a tiroir rotatif, en particulier pour servo-directions de vehicules a moteur Ceased WO1987002319A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LUPCT/EP85/00551 1985-10-21
EP8500551 1985-10-21

Publications (2)

Publication Number Publication Date
WO1987002319A2 true WO1987002319A2 (fr) 1987-04-23
WO1987002319A3 WO1987002319A3 (fr) 1987-07-16

Family

ID=8165071

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1986/000576 Ceased WO1987002319A2 (fr) 1985-10-21 1986-10-08 Soupape a tiroir rotatif, en particulier pour servo-directions de vehicules a moteur

Country Status (4)

Country Link
EP (1) EP0242389A1 (fr)
JP (1) JPS63501209A (fr)
DE (1) DE3634215C2 (fr)
WO (1) WO1987002319A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0673828A1 (fr) * 1993-01-29 1995-09-27 Trw Inc. Système de direction assistée
WO1997049596A1 (fr) * 1996-06-26 1997-12-31 Bishop Steering Pty Ltd Composant muni de fentes et son procede de fabrication

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2042216T3 (es) * 1989-08-10 1993-12-01 General Motors Corporation Aparato de control electromagnetico para hacer variar el esfuerzo de direccion del conductor de un sistema de direccion por energia hidraulica.
JP3044273B2 (ja) * 1991-05-24 2000-05-22 ビショップ ステアリング テクノロジー リミテッド 動力操向装置の回転弁
DE4240100A1 (de) * 1992-11-28 1994-06-01 Schaeffler Waelzlager Kg Zentriereinrichtung
DE4404533C2 (de) * 1994-02-12 2001-03-01 Trw Fahrwerksyst Gmbh & Co Lenkventil mit Mittenzentrierung
DE4404535C2 (de) * 1994-02-12 2000-07-27 Trw Fahrwerksyst Gmbh & Co Lenkventil
DE19615543C2 (de) * 1996-04-19 1998-09-17 Daimler Benz Ag Servoventil
DE10145903A1 (de) * 2001-09-18 2003-04-03 Zf Lenksysteme Gmbh Drehschieberventil für Hilfskraftlenkungen
DE102009046141A1 (de) 2009-10-29 2011-05-05 Zf Lenksysteme Gmbh Lenkgetriebe für ein Lenksystem und Verfahren zur Montage desselben
US9512838B2 (en) 2013-03-15 2016-12-06 Eaton Corporation Torque-generating steering device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2906361A (en) * 1957-01-18 1959-09-29 Int Harvester Co Manual and hydraulic steering apparatus for vehicles
GB832559A (en) * 1957-05-01 1960-04-13 Burman & Sons Ltd Hydraulically operated vehicle steering mechanisms
DE2609784C3 (de) * 1976-03-10 1980-04-17 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Hilfskraftlenkung insbesondere für Kraftfahrzeuge
JPS5536132A (en) * 1978-09-01 1980-03-13 Toyota Motor Corp Power steering for vehicle
DE2913484C2 (de) * 1979-04-04 1982-10-07 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Hydraulische Hilfskraftlenkung, insbesondere für Kraftfahrzeuge

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0673828A1 (fr) * 1993-01-29 1995-09-27 Trw Inc. Système de direction assistée
WO1997049596A1 (fr) * 1996-06-26 1997-12-31 Bishop Steering Pty Ltd Composant muni de fentes et son procede de fabrication
US6203258B1 (en) 1996-06-26 2001-03-20 Bishop Steering Pty Limited Slotted component and method of manufacture thereof
US6244799B1 (en) 1996-06-26 2001-06-12 Bishop Steering Pty Limited Slotted component and method of manufacture thereof

Also Published As

Publication number Publication date
WO1987002319A3 (fr) 1987-07-16
DE3634215A1 (de) 1987-04-23
DE3634215C2 (de) 1996-04-04
EP0242389A1 (fr) 1987-10-28
JPS63501209A (ja) 1988-05-12

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