WO2003104063A1 - Direction a cremaillere - Google Patents

Direction a cremaillere Download PDF

Info

Publication number
WO2003104063A1
WO2003104063A1 PCT/EP2003/005734 EP0305734W WO03104063A1 WO 2003104063 A1 WO2003104063 A1 WO 2003104063A1 EP 0305734 W EP0305734 W EP 0305734W WO 03104063 A1 WO03104063 A1 WO 03104063A1
Authority
WO
WIPO (PCT)
Prior art keywords
steering
pinion
rack
housing
steering housing
Prior art date
Application number
PCT/EP2003/005734
Other languages
German (de)
English (en)
Inventor
Franz-Josef Joachim
Jens-Uwe Hafermalz
Rainer SCHÄNZEL
Karl Benkler
Hartmut Specht
Hermann Ocker
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
Publication of WO2003104063A1 publication Critical patent/WO2003104063A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D3/00—Steering gears
    • B62D3/02—Steering gears mechanical
    • B62D3/12—Steering gears mechanical of rack-and-pinion type
    • B62D3/126—Steering gears mechanical of rack-and-pinion type characterised by the rack
    • 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
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0421—Electric motor acting on or near steering gear

Definitions

  • Rack and pinion steering systems which can also be designed as rack and pinion hydraulic steering systems or electrical servo or power steering systems, are from “Chassis technology:
  • the rack and pinion steering is essentially formed from a cylindrical steering housing in which a rack is axially displaceably arranged.
  • An end of a steering column designed as a pinion is mounted centrally or laterally in a bore of the steering housing via a pinion bearing in the axial direction of the steering housing.
  • the pinion meshes with the rack.
  • a thrust piece inserted in an axial guide of the steering housing holds the pinion in contact with the rack.
  • Such steering gear with sliding movement are provided with a grease filling in a known manner. If high steering torques and steering speeds occur during operation, this can lead to increased wear, seizure or even dimples. This increases the steering play and there are annoying operating noises.
  • the invention has for its object to develop a rack and pinion steering of the generic type so that wear of the rack and pinion steering is minimized.
  • the invention provides for the steering housing to be filled with oil.
  • the oil filling is used for lubrication and cooling purposes.
  • the steering gear with sliding movement is assigned a gear of an electric motor, the gear of the electric motor being able to be accommodated in the steering housing. It is advisable to supply the gearbox of the electric motor with the oil filling with lubricant. In order to minimize splashing losses in the gearbox of the electric motor, it can be expedient to select the oil levels of the steering housing and the gearbox of the electric motor differently.
  • the rack and pinion steering with the gear for the electric motor is thus designed with splash lubrication, preferably with provisions for bearing lubrication of all bearings in the steering housing and the gear of the electric motor.
  • greased oils or high pressure gear oils can be used.
  • Greased oils improve the adhesion to the tooth flank surfaces.
  • the oil which should be used in a temperature range from -40 ° C to 130 ° C, also serves to dissipate heat from the gearbox of the electric motor to the steering housing.
  • the necessary displacement force of the rack in particular when the rack and pinion steering is operated without service support, is minimized by this design measure.
  • the pinion bearing is sealed to the surroundings of the steering housing with a shaft sealing ring.
  • a pressure piece is arranged in a bore in the steering housing in order to release the toothing between the pinion and the toothed rack, wherein it is expedient to seal the pressure piece and / or its cover with O-rings.
  • a bellows which seals the area between the respective axial end of the steering housing and a tie rod, is suitable for the axial sealing of the steering housing.
  • the tie rod and / or the steering housing can be additionally sealed to the bellows via an O-ring in order to achieve a secure seal over the entire temperature range.
  • Fig. 1 shows a longitudinal section through a steering housing of a rack and pinion steering
  • Fig. 2 shows a cross section through the steering housing along the line II - II in Fig.1.
  • a longitudinal section through a steering housing 2 of a rack and pinion steering 1 is shown.
  • the steering housing 2 is designed as a cylindrical die-cast housing and has a bearing 13, 13 'for a rack 4 at its axial ends.
  • the rack 4 extends through the steering housing 2 and is articulated at its axial ends to a tie rod 12, 12 ', which, depending on the selected axle construction, provide a corresponding pivoting movement of steerable wheels of a motor vehicle via further steering levers.
  • the steering box 2 is provided with a respective false tenbalg 11, 11 ', each of the axial end of the steering housing 2 and a track rod 12,12' engages sealingly, sealed off from the environment.
  • the rack 4 is formed from a round steel flattened on one side, in the flattening of a toothing 15 is incorporated.
  • the side of the toothed rack 4 opposite the toothing 15 serves as a sliding surface for supporting the toothed rack 4 with a pressing device 16.
  • the pressing device 16 is, in a known manner, made of a spring-loaded pressure piece 8, which extends in a bore approximately transverse to the longitudinal axis 17 of the steering housing 2 9 is slidably formed.
  • the pressure piece 8 presses the rack 4 to release play on the involute teeth of the pinion 3 (see. Fig. 2).
  • the pinion 3 and the pressure piece 8 form the bearing 13 for the tooth days 4.
  • the pinion 3 is mounted in a bearing 18 on a steering spindle connection 19 in a steering column input 6 of the steering housing.
  • a bearing 14 is arranged on the end of the pinion 3 facing away from the steering spindle connection 19 in the steering housing 2 and is sealed off from the surroundings by the steering housing 2 itself.
  • the pinion is thus fixed axially and radially.
  • the pinion 3 engages in the toothing 15 of the toothed rack 4 in such a way that, when it rotates, it causes the toothed rack 4 to move axially in the steering housing.
  • rack-and-pinion steering system 1 is not designed purely mechanically, but rather as an electrical servo or power steering system, a gearbox housing of a gearbox of an electric motor can be connected to the steering housing.
  • the steering housing 2 and the transmission housing of the transmission for the electric motor are provided with an oil filling 5.
  • the lubrication is designed as splash lubrication, it being ensured that at least the pinion 3 or the toothing 15 is immersed in oil.
  • the gear not shown
  • Electric motor immerses at least one gear of each gear stage in oil.
  • the oil is suitable to maintain its lubricity at temperatures of around -40 ° C to 130 ° C.
  • the oil filling ensures that a sufficiently heavy-duty lubricating film is available on the tooth flanks even at high pressures on the tooth flanks, for example at high steering speeds.
  • the heat dissipation from the rack and pinion steering is also improved by the oil filling.
  • the rack and pinion steering is quiet in operation.
  • the oil filling 5 also lubricates the bearing points of all movable gear parts.
  • an O-ring 10 is inserted in a circumferential groove 20 of the pressure piece 8 and seals the pressure piece to the bore 9 in which it is slidably mounted in the steering housing 2.
  • Another O-ring 21 seals the cover 22 on the pressure piece 8 and thus the steering housing 2 against oil losses in this area.
  • the pinion bearing on the steering column input 6 is sealed off from the steering housing 2 by a shaft seal 7.

Landscapes

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

Abstract

L'invention concerne une direction à crémaillère (1), conçue en particulier pour un véhicule automobile, comprenant un boîtier de direction (2) ainsi qu'un pignon (3) qui est monté de manière rotative dans ce boîtier de direction (2). Un engrenage (15) d'une crémaillère (4) qui est montée de façon à pouvoir être déplacée axialement dans le boîtier de direction (2) s'engrène avec le pignon (3). L'objectif de cette invention est d'empêcher que la direction à crémaillère (1) s'use en fonctionnant à sec pour des couples de direction élevés ou à des vitesses de direction élevées. A cet effet, le boîtier de direction (2) de la direction à crémaillère est rempli d'un bain d'huile (5) qui présente une action lubrifiante et réfrigérante. Lorsque la direction est servo-assistée par un moteur électrique, un bain d'huile est également fourni pour les étages d'engrenage correspondants.
PCT/EP2003/005734 2002-06-06 2003-05-31 Direction a cremaillere WO2003104063A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10225034.0 2002-06-06
DE2002125034 DE10225034A1 (de) 2002-06-06 2002-06-06 Zahnstangenlenkung

Publications (1)

Publication Number Publication Date
WO2003104063A1 true WO2003104063A1 (fr) 2003-12-18

Family

ID=29557568

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2003/005734 WO2003104063A1 (fr) 2002-06-06 2003-05-31 Direction a cremaillere

Country Status (2)

Country Link
DE (1) DE10225034A1 (fr)
WO (1) WO2003104063A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005034566A1 (de) * 2005-07-23 2007-01-25 Zf Lenksysteme Gmbh Kühlvorrichtung für einen Druckmittelkreislauf eines Fahrzeuges
US11345393B1 (en) * 2021-12-08 2022-05-31 Super ATV, LLC Dual bushing steering rack
CN115366988A (zh) * 2022-09-23 2022-11-22 扬州市伏尔坎机械制造有限公司 一种可实时调整转向角度半挂车后轮转向控制装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1915219A1 (de) * 1968-03-27 1970-08-20 Cam Gears Ltd Zahnstangentrieb
DE19947510A1 (de) * 1999-10-01 2001-04-05 Mercedes Benz Lenkungen Gmbh Zahnstangenlenkung für Kraftfahrzeuge
EP1167158A1 (fr) * 2000-06-23 2002-01-02 Société de Mécanique d'Irigny Direction assistée électrique pour véhicule automobile

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB766141A (en) * 1954-08-20 1957-01-16 Alford & Alder Engineers Ltd Improvements in or relating to steering gears for vehicles
US5379856A (en) * 1993-10-12 1995-01-10 Trw Inc. Rack and pinion steering gear assembly
DE19715809A1 (de) * 1997-04-16 1998-10-22 Bayerische Motoren Werke Ag Zahnstangen-Hydro-Lenkung für Fahrzeuge
DE10032120A1 (de) * 1999-12-17 2001-07-19 Zf Lenksysteme Gmbh Lenkvorrichtung für Kraftfahrzeuge

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1915219A1 (de) * 1968-03-27 1970-08-20 Cam Gears Ltd Zahnstangentrieb
DE19947510A1 (de) * 1999-10-01 2001-04-05 Mercedes Benz Lenkungen Gmbh Zahnstangenlenkung für Kraftfahrzeuge
EP1167158A1 (fr) * 2000-06-23 2002-01-02 Société de Mécanique d'Irigny Direction assistée électrique pour véhicule automobile

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
REIMPELL: "Fahrwerktechnik: Lenkung Seiten/pages 70 - 90: '3.1 Zahnstangenlenkung'", 1984, VOGEL-BUCHVERLAG, WÜRZBURG, XP002253670 *

Also Published As

Publication number Publication date
DE10225034A1 (de) 2003-12-18

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