WO1994020354A1 - Direction assistee, notamment pour vehicules automobiles - Google Patents

Direction assistee, notamment pour vehicules automobiles Download PDF

Info

Publication number
WO1994020354A1
WO1994020354A1 PCT/EP1994/000733 EP9400733W WO9420354A1 WO 1994020354 A1 WO1994020354 A1 WO 1994020354A1 EP 9400733 W EP9400733 W EP 9400733W WO 9420354 A1 WO9420354 A1 WO 9420354A1
Authority
WO
WIPO (PCT)
Prior art keywords
steering
valve
spindle
ball
ball screw
Prior art date
Application number
PCT/EP1994/000733
Other languages
German (de)
English (en)
Inventor
Armin Lang
Helmut KNÖDLER
Hans-Werner Majer
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 WO1994020354A1 publication Critical patent/WO1994020354A1/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
    • B62D5/08—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
    • B62D5/081—Seat valves
    • 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
    • B62D5/20—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle specially adapted for particular type of steering gear or particular application
    • B62D5/24—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle specially adapted for particular type of steering gear or particular application for worm type

Definitions

  • the invention relates to an auxiliary power steering system, in particular for motor vehicles, according to the preamble of claim 1.
  • an input member is rotatably mounted in a steering housing.
  • An output member is guided axially displaceably in the steering housing as a function of the rotary movement of the input member.
  • the output member is connected to a servo motor for auxiliary power support.
  • a steering valve serves to control a pressure means to and from the servo motor and is adjustable as a function of a movement of the input member.
  • the steering valve has an inlet seat valve and an outlet seat valve for each steering direction.
  • Such an auxiliary power steering is the subject of the older German patent application P 42 03 335.7.
  • This is a power assisted rack and pinion steering system, the input member of which is a pinion and the output member of which is a rack.
  • the pinion is pivotally mounted, the pivoting movement taking place as a function of a rotation of the pinion and serving to adjust the steering valve.
  • the power assisted rack and pinion steering system uses the movement of the pinion to adjust the steering valve.
  • the application of a closed center tax system, ie of tax Systems in which the pressure medium line coming from the pressure medium source is blocked in the neutral position of the steering valve is therefore limited to power assisted-rack steering systems.
  • the invention is based on the object of designing a control system with a closed center which can also be used for ball nut hydraulic steering systems.
  • the solution is achieved in particular in that the input member is a ball screw that can be axially displaced within narrow limits and the output member is a ball nut.
  • An actuating lever can be rotated on the ball screw, but is axially immovable relative to the ball screw.
  • the actuating lever which serves to adjust the steering valve, is acted upon by the force of the centering spring in its axial neutral position.
  • the ball screw is kept free of hydraulic, axially directed forces.
  • FIG. 1 shows a longitudinal section through the power steering system according to the invention.
  • FIG. 2 shows a partial section through the power steering system along the line II-II in FIG. 1st
  • an input member in the form of a ball screw 2 is rotatably supported and axially displaceable in a radial bearing 3 within narrow limits.
  • the ball screw 2 protrudes from the steering housing 1 and carries a steering spindle connection 4.
  • the end 5 of the ball screw 2 opposite the steering spindle connection 4 projects into a bore 6 in the steering housing 1.
  • the end 5 of the ball screw 2 is sealed off from the steering housing 1 by a seal 7.
  • a space 10 is formed between the end face 8 of the ball screw 2 and the steering housing 1 and is pressurized with atmospheric pressure via a relief bore 11 or communicates with a pressure medium container 12 via this bore.
  • the ball screw 2 is in a driving connection via a ball chain 13 with a ball nut 14, which is formed at one end as a servo piston 15.
  • the servo piston 15 separates two working spaces 16 and 17 of a servo motor 18 arranged in the steering housing 1.
  • An actuating lever 20 is rotatably connected to the ball screw 2, for example via a double-row ball bearing 21. At the same time, the actuating lever 20 is held against tilting and axially immovable relative to the ball screw 2.
  • the actuating lever 20 is used to adjust a steering valve 22 which is used to control the pressure medium conveyed by a servo pump (not shown) and expediently stored in a memory to and from the working spaces 16 and 17 of the servo motor 18 in the steering housing 1 ⁇ is classified.
  • the steering valve 22 contains two inlet seat valves 23 and 24 and two outlet seat valves 25 and 26.
  • the inlet and outlet seat valves 23, 24, 25, 26 are arranged essentially parallel to the axis of the ball screw 2. In this case, an inlet seat valve 23 and 24 and an outlet seat valve 25 and 26 are arranged coaxially to each other.
  • Inlet seat valves 23 and 24 closed.
  • the play-free centering takes place on the one hand by two centering springs 30 and 31, which press a stop disk 32 against a stop 33 fixed to the housing and against the actuating lever 20, and on the other hand by means of a centering spring 34, which expediently acts directly on the actuating lever 20.
  • the centering springs 30, 31 and 34 are expediently of the same size and have the same biasing forces.
  • the actuating washer 32 is pressed upwards with a force twice as high - in FIG. 1 - while only the simple force of the centering spring 34 acts on the actuating lever 20 in the other direction. Since the adjustment paths of the actuating lever 20 and thus of the steering valve 22 are only very small, the centering forces are the same for both steering directions. (In the drawing, the adjustment paths of the exhaust seat valves 25 and 26 are shown exaggeratedly large in order to show the passages which are open when the steering valve 22 is in the neutral position.)
  • the function of the power steering system according to the invention is described below: If the ball screw 2 is rotated, for example, by turning a steering handwheel (not shown) to the right, it screws into the ball nut 14 so that after overcoming the centering force of the two centering springs 30 and 31 (the force of the centering spring 34 has a reinforcing effect in this direction), the stop disk 32 is moved downward. As a result, the lower outlet seat valve 25 is closed and then the lower inlet seat valve 23 is opened. From an inlet port 35 via the then open inlet seat valve 23 pressure medium in the lower working space 16 is guided, whereby a movement of the ball nut 14 above the servo piston 15 is increased.
  • the radial bearing 3 is expediently designed as a combined ball-roller bearing. By means of such a bearing, the friction of the spindle bearing can be practically neglected in normal operation of the power steering when the ball spindle 2 moves axially.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Mechanically-Actuated Valves (AREA)

Abstract

L'invention concerne une direction assistée, notamment pour véhicules automobiles, qui comprend une broche à billes (2) montée rotative dans une boîte de direction (1) et coulissant dans le sens axial entre des limites étroites. La broche à billes (2) coopère avec un écrou à billes (14) relié au servopiston (15) d'un servomoteur (18). Une soupape de braquage (22) pouvant être régulée en fonction d'un mouvement rotatif de la broche à billes (2), assure la commande permettant au fluide hydraulique d'être acheminé jusqu'aux deux espaces de travail (16, 17) du servomoteur (18) et d'en être ramené. La soupape de braquage (22) comporte pour chaque sens de braquage, une soupape d'admission à siège (23, 24) et une soupape d'échappement à siège (25, 26). Les soupapes d'admission à siège (23, 24) sont fermées lorsque la soupape de braquage est en position neutre. La régulation de la soupape de braquage (22) s'opère par l'intermédiaire d'un levier de commande (20) maintenu rotatif sur la broche à billes (2), mais non coulissant dans le sens axial par rapport à ladite broche à billes et qui est soumis à la force exercée par des ressorts de centrage (30, 31, 34) qui le maintiennent en position axiale neutre. La broche à billes (2) est libérée par des forces hydrauliques supplémentaires, dirigées dans le sens axial, du fait qu'une de ses extrémités (5) est introduite de manière étanche dans la boîte de direction (1) et forme un espace (10) entre la surface frontale (8) de la broche à billes (2) et la boîte de direction (1), lequel se trouve exposé à la pression atmosphérique.
PCT/EP1994/000733 1993-03-12 1994-03-09 Direction assistee, notamment pour vehicules automobiles WO1994020354A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4307890.7 1993-03-12
DE19934307890 DE4307890A1 (de) 1993-03-12 1993-03-12 Hilfskraftlenkung, insbesondere für Kraftfahrzeuge

Publications (1)

Publication Number Publication Date
WO1994020354A1 true WO1994020354A1 (fr) 1994-09-15

Family

ID=6482632

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1994/000733 WO1994020354A1 (fr) 1993-03-12 1994-03-09 Direction assistee, notamment pour vehicules automobiles

Country Status (2)

Country Link
DE (1) DE4307890A1 (fr)
WO (1) WO1994020354A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106394657A (zh) * 2016-10-09 2017-02-15 中国北方车辆研究所 一种转向器输入轴锁紧装置及其转向器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19603270C1 (de) * 1996-01-30 1997-07-10 Daimler Benz Ag Hydraulische Servolenkung für Kraftfahrzeuge

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0001705A1 (fr) * 1977-10-17 1979-05-02 CAM GEARS Limited Dispositif de direction assistée
WO1985001924A1 (fr) * 1983-11-05 1985-05-09 Zahnradfabrik Friedrichshafen Ag Direction assistee a cremaillere, en particulier pour vehicules a moteur
DE4126020A1 (de) * 1991-08-06 1993-02-11 Zahnradfabrik Friedrichshafen Hilfskraftlenkung
DE4203335A1 (de) * 1992-02-06 1993-08-12 Zahnradfabrik Friedrichshafen Zahnstangen-hilfskraftlenkung, insbesondere fuer kraftfahrzeuge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0001705A1 (fr) * 1977-10-17 1979-05-02 CAM GEARS Limited Dispositif de direction assistée
WO1985001924A1 (fr) * 1983-11-05 1985-05-09 Zahnradfabrik Friedrichshafen Ag Direction assistee a cremaillere, en particulier pour vehicules a moteur
DE4126020A1 (de) * 1991-08-06 1993-02-11 Zahnradfabrik Friedrichshafen Hilfskraftlenkung
DE4203335A1 (de) * 1992-02-06 1993-08-12 Zahnradfabrik Friedrichshafen Zahnstangen-hilfskraftlenkung, insbesondere fuer kraftfahrzeuge
WO1993015947A1 (fr) * 1992-02-06 1993-08-19 Zf Friedrichshafen Ag Direction assistee a cremaillere, notamment pour des vehicules automobiles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106394657A (zh) * 2016-10-09 2017-02-15 中国北方车辆研究所 一种转向器输入轴锁紧装置及其转向器
CN106394657B (zh) * 2016-10-09 2018-09-28 中国北方车辆研究所 一种转向器输入轴锁紧装置及其转向器

Also Published As

Publication number Publication date
DE4307890A1 (de) 1994-09-15

Similar Documents

Publication Publication Date Title
DE3122370C2 (fr)
DE4330338C1 (de) Fluidische, insbesondere hydraulische Servosteuerung
EP0192641B1 (fr) Direction assistee a cremaillere, en particulier pour vehicules a moteur
EP0597945B1 (fr) Direction assistee
EP0624135B1 (fr) Direction assistee a cremaillere, notamment pour des vehicules automobiles
DE3122368C2 (fr)
WO2000017539A1 (fr) Soupape d'amortissement
DE2313645C3 (de) Steuerventil
DE4303854A1 (de) Hilfskraftlenkung, insbesondere für Kraftfahrzeuge
WO1994020354A1 (fr) Direction assistee, notamment pour vehicules automobiles
DE3220922C2 (fr)
WO1984002500A1 (fr) Direction assistee, en particulier pour vehicules a moteur
EP0297277A2 (fr) Système de soupape d'assistance
DE2403006C3 (de) Steuerventil für Druckmittel-Steuerung von Hilfskraftlenkungen, insbesondere für Kraftfahrzeuge
DE1027078B (de) Drehkraftverstaerker, insbesondere fuer Kraftfahrzeuglenkungen, mit umlaufendem Fluessigkeitsstrom
DE2440800A1 (de) Stroemungssteuerventilvorrichtung
EP0838381B1 (fr) Installation pour la correction de la force de freinage commandée en fonction de la charge
DE2223881A1 (de) Servoschaltgeraet
DE2547916A1 (de) Ventil fuer die endabschaltung eines hydraulisch betaetigbaren servomotors, insbesondere von hydrostatischen kraftfahrzeug-servolenkanlagen
DE4338010A1 (de) Hydraulisch betätigte Lenkeinrichtung für ein Fahrzeug
DE4414162A1 (de) Hydraulische Hilfskraftlenkung, insbesondere für Kraftfahrzeuge
EP0825093A2 (fr) Servovalve
DE10321109B4 (de) Leckagekompensierungsanordnung in einer Steuereinrichtung für ein vollhydraulisches Lenksystem
DE3520128C2 (de) Hydraulischer Stellantrieb
DE2924196C2 (de) Hydraulische Steuervorrichtung, insbesondere für Fahrzeuglenkungen

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): BR JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase