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WO2000023313A1 - Ameliorations de directions assistees electriques - Google Patents

Ameliorations de directions assistees electriques Download PDF

Info

Publication number
WO2000023313A1
WO2000023313A1 PCT/GB1999/003306 GB9903306W WO0023313A1 WO 2000023313 A1 WO2000023313 A1 WO 2000023313A1 GB 9903306 W GB9903306 W GB 9903306W WO 0023313 A1 WO0023313 A1 WO 0023313A1
Authority
WO
WIPO (PCT)
Prior art keywords
gear
hub
gear wheel
gearbox
web
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/GB1999/003306
Other languages
English (en)
Inventor
Daniel John Durocher
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.)
TRW Lucas Varity Electric Steering Ltd
Original Assignee
TRW Lucas Varity Electric Steering Ltd
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 TRW Lucas Varity Electric Steering Ltd filed Critical TRW Lucas Varity Electric Steering Ltd
Priority to EP99947764A priority Critical patent/EP1121287A1/fr
Publication of WO2000023313A1 publication Critical patent/WO2000023313A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/22—Toothed members; Worms for transmissions with crossing shafts, especially worms, worm-gears
    • F16H55/24—Special devices for taking up backlash
    • 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
    • B62D5/0409—Electric motor acting on the steering column

Definitions

  • This invention relates to improvements in electric power steering systems for vehicles of the kind in which torque from an electric motor drives a steering column through a gearbox.
  • electric signals passed to a control unit from a torque sensor mounted on the steering column are used to control the drive of the electric motor.
  • the gearbox comprises a single reduction worm and wheel set, with a ratio typically between 12: 1 and 20: 1 in order to achieve a compact motor.
  • a ratio typically between 12: 1 and 20: 1 in order to achieve a compact motor.
  • a plastics material in the construction of the gear wheel such as acetal and poly amide. This is because a relatively low sliding friction, 6 to 7% with lubrication, is achieved when such a gearwheel co-operates with a steel worm.
  • gearing which, in a single pair of members, can produce the required reduction ratio together with the desired efficiencies.
  • gearing is known as a spiroidal gear set, comprising a special gearwheel with teeth on one face, plus a pinion.
  • the gearbox comprises meshing members, and the members are resiliently biased into engagement with each other to remove backlash for at least the lower end of the operating torque range.
  • Arranging for the resilient biasing to be effective only at the lower end of the operating torque range reduces or substantially eliminates rattle without any substantial increase in friction throughout the total operating torque range.
  • the meshing members can be produced by insert moulding and sintering.
  • the resilient means may comprise a thin flexible ring attached to the gear wheel.
  • the annular portion defining the supplementary gear may occupy an annular space inside the inner diameter of the said remainder of the gear wheel.
  • the supplementary gear may be situated at the outside of the outer diameter of the said remainder of the gear wheel, or it may be housed in an annular groove intermediate the inner and outer diameters of the gear wheel.
  • Torque generated at the supplementary gear is transmitted to a hub, and hence to a shaft, through the flexible ring.
  • the flexible ring is clamped to the hub using the same screws as are used for securing the gear wheel to it.
  • the supplementary gear includes a flexible web which provides resilient biasing for the lower end of the operating torque range thereby defining the resilient means.
  • the web may be of any convenient construction in order to provide the necessary degree of inherent flexibility.
  • the web may be of a reduced wall thickness in comparison with the remainder of the gear. Although it may be of planar outline, in another construction it may be curved to increase flexibility. In either construction the web may also be formed with a plurality of angularly spaced radial slots or openings to lend additional flexibility to the web.
  • the gearbox comprises meshing members which are resiliently biased into engagement with each other, and one of the members comprises a gear wheel in turn comprising a gear, a hub, and a clamping member, the hub and clamping member being clamped against opposite faces of the gear by clamping devices incorporating resilient means so constructed and arranged as to allow a given clearance between the gear, the hub and the clamping member.
  • the gear may include a radial flange formed with the plurality of angularly spaced openings, and each resilient means may comprise a washer of which the peripheral edge co-operates with the edges of a complementary opening.
  • each opening has the profile of a pentagon, with curved sides.
  • the meshing members are resiliently biased into engagement with each other for at least the lower end of the operating torque range.
  • Figure 1 is a view of a known spiroid/spiradrive gear set for an electrical power assisted steering (EPAS) system;
  • EPAS electrical power assisted steering
  • Figure 2 is a section on the line 2-2 of Figure 1 ;
  • Figure 3 is a plan of a gear wheel for a gearbox of the worm and wheel type
  • Figure 4 is an inverted plan of the gear wheel
  • Figure 5 is a section through the gear wheel
  • Figure 6 is a view on an enlarged scale showing the installation of the wheel in a gearbox
  • Figure 7 is a plan of another gear wheel
  • Figure 8 is an inverted plan of the gear wheel
  • Figure 9 is a section through the gear wheel
  • Figure 10 is a view on an enlarged scale showing the installation of the gear wheel in a gearbox
  • Figure 11 is a plan of yet another gear wheel
  • Figure 12 is an inverted plan of the gear wheel
  • Figure 13 is a section through the gear wheel
  • Figure 14 is a view on an enlarged scale showing the installation of the wheel in a gearbox
  • Figure 15 is a plan of yet another gear wheel.
  • Figure 16 is an exploded view of the gear wheel of Figure 15.
  • the known spiroid/spiradrive gearset illustrated in Figures 1 and 2 of the accompanying drawings comprises a gear wheel 1 of plastics material, and a steel pinion 2 having meshing teeth of spiral formation.
  • the pinion 2 is arranged chordally with respect to the gear wheel 1 and with its main axis normal to that of the gear wheel 1.
  • the gear wheel 1 is mounted on a metal hub 3 and is secured to a flange 4 projecting radially outwards from the hub 3 by means of a plurality of angularly spaced screws 5 which are located on a pitch circle of constant diameter and are screwed into tapped holes 6 extending through the flange.
  • the gear wheel 1 is clamped between the flange 4 and an annular clamping ring 7 provided with counterbored recesses 8 to receive the heads of the screws 5.
  • the hub 3 is keyed to a shaft 9 leading to a steering column, and the hub 3 and the shaft 9 are journalled for rotation in spaced bearings 10 and 11 housed in spaced walls of a housing of a gear box.
  • the pinion 2 is similarly journalled for rotation in a bearing 12.
  • the gear wheel 1 comprises a supplementary gear wheel 20 in the form of a one-piece plastics moulding for a gearbox of the worm and wheel type.
  • the supplementary gear 20 comprises a web 30 of reduced thickness which integrally connects a spirably toothed peripheral rim 31 for meshing with the worm 2 to an inner annular radial flange 32.
  • Angularly spaced openings 33 in the flange 32 receive the screws 5 for clamping the flange 32 against the flange 4 of the hub 3.
  • the web 30 is of sinusoided outline to facilitate installation in a limited space and yet provide the necessary inherent resilience or flexibility to achieve the necessary freedom of movement in an axial direction whilst restraining it rotationally in a manner which is free of backlash.
  • the web 30 of reduced thickness is planar in outline and is formed with a plurality of angularly spaced radial slots or openings 36 of generally segmental outline to achieve the desired degree of flexibility and inherent resilience. Regions 37 between adjacent pairs of slots 36 act as fingers which flex to enable the rim 31 to deflect with respect to the flange 32.
  • the web 30 is of arcuate outline facing away from the gear wheel 1 , and is formed with a plurality of slots or openings 38, similar to the slots or openings 36.
  • the gear wheel 1 comprises an annular peripherally toothed gear 40 of synthetic plastics material, suitably acetal, having an inwardly directed radial flange 41 surrounding a central aperture 42, an internally splined hub 43, and an annular clamping member 44.
  • the gear 40 may comprise a one-piece moulding.
  • the flange 41 is formed with a plurality of circumferentially spaced openings 45, each having a profile of a pentagon with inwardly curved sides 46, and with lands 47 in the form of teeth between adjacent openings 45 lying in a circle concentric with the hub 43.
  • the flange 41 is clamped between the hub 43 and the clamping member 44 by clamping devices comprising circumferentially spaced screws 48 which are passed through openings 49 in the clamping member 44 and screwed into tapped complementary openings 50 in the hub 43.
  • a spacer 51 on each screw 47 clamped between the clamping member 44 and the hub 43, is surrounded by a circular washer 52 of elastomeric material and each member is received in a respective one of the openings 45 in the flange 41.
  • the spacers 51 are so arranged as to allow a clearance, substantially in the order of 1000 microns, between the gear 40, the hub 43, and the clamping member 44. This therefore allows the gear 40 to essentially "float” albeit constrained by the elastic properties of the washers 52 as they engage the curved sides 46 of the respective openings 45.
  • mechanical steps may have to be included to prevent overtravel in the torsional direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Gears, Cams (AREA)
  • Gear Transmission (AREA)

Abstract

L'invention porte sur une direction assistée électrique pour véhicules dans laquelle le couple d'un moteur électrique agit sur la colonne de direction par l'intermédiaire d'une boîte de transmission. Les signaux électriques transmis à une unité de commande par un détecteur de couple monté sur la colonne de direction servent à commander la marche du moteur électrique. La boîte de transmission comporte des éléments en prise (1, 2) à rattrapage élastique de jeu sur au moins la partie inférieure de la plage opérationnelle du couple.
PCT/GB1999/003306 1998-10-17 1999-10-15 Ameliorations de directions assistees electriques Ceased WO2000023313A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99947764A EP1121287A1 (fr) 1998-10-17 1999-10-15 Ameliorations de directions assistees electriques

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9822603.8A GB9822603D0 (en) 1998-10-17 1998-10-17 Improvements relating to electric power steering systems
GB9822603.8 1998-10-17

Publications (1)

Publication Number Publication Date
WO2000023313A1 true WO2000023313A1 (fr) 2000-04-27

Family

ID=10840694

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/003306 Ceased WO2000023313A1 (fr) 1998-10-17 1999-10-15 Ameliorations de directions assistees electriques

Country Status (3)

Country Link
EP (1) EP1121287A1 (fr)
GB (1) GB9822603D0 (fr)
WO (1) WO2000023313A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002038432A1 (fr) * 2000-11-13 2002-05-16 Zf Lenksysteme Gmbh Mecanisme de direction electrique destine a des vehicules automobiles
GB2413372A (en) * 2004-04-22 2005-10-26 Honda Motor Co Ltd Worm gear mechanism and electric power steering apparatus including the same
EP1591346A1 (fr) * 2004-04-26 2005-11-02 HONDA MOTOR CO., Ltd. Engrenage à vis sans fin et direction assistée électrique equipée avec celle
CN100392292C (zh) * 2004-04-26 2008-06-04 本田技研工业株式会社 蜗轮机构及搭载蜗轮机构的电动动力转向装置
JP2013190015A (ja) * 2012-03-13 2013-09-26 Asano Gear Co Ltd ギヤおよびディファレンシャル装置
KR20160049591A (ko) * 2014-10-27 2016-05-10 현대모비스 주식회사 차량용 전동 스티어링 장치의 플러그 조립체

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2702995A (en) * 1953-12-31 1955-03-01 Goodman Mfg Co Shock absorbing gearing
GB2228461A (en) * 1989-01-30 1990-08-29 Jidosha Kiki Co Electric power steering apparatus
DE19548609A1 (de) * 1995-12-23 1997-06-26 Dufa Deutsche Uhrenfabr Gmbh Zahnradgetriebe
EP0908647A2 (fr) * 1997-10-13 1999-04-14 Toyota Jidosha Kabushiki Kaisha Structure d'engrenage hypoide

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2702995A (en) * 1953-12-31 1955-03-01 Goodman Mfg Co Shock absorbing gearing
GB2228461A (en) * 1989-01-30 1990-08-29 Jidosha Kiki Co Electric power steering apparatus
DE19548609A1 (de) * 1995-12-23 1997-06-26 Dufa Deutsche Uhrenfabr Gmbh Zahnradgetriebe
EP0908647A2 (fr) * 1997-10-13 1999-04-14 Toyota Jidosha Kabushiki Kaisha Structure d'engrenage hypoide

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002038432A1 (fr) * 2000-11-13 2002-05-16 Zf Lenksysteme Gmbh Mecanisme de direction electrique destine a des vehicules automobiles
DE10056133A1 (de) * 2000-11-13 2002-05-23 Zf Lenksysteme Gmbh Elektrische Lenkvorrichtung für Kraftfahrzeuge
US7650809B2 (en) 2000-11-13 2010-01-26 Zf Lenksysteme Gmbh Electrical steering device for motor vehicles
GB2413372A (en) * 2004-04-22 2005-10-26 Honda Motor Co Ltd Worm gear mechanism and electric power steering apparatus including the same
GB2413372B (en) * 2004-04-22 2006-07-19 Honda Motor Co Ltd Worm gear mechanism and electric power steering apparatus including the same
EP1591346A1 (fr) * 2004-04-26 2005-11-02 HONDA MOTOR CO., Ltd. Engrenage à vis sans fin et direction assistée électrique equipée avec celle
CN100392292C (zh) * 2004-04-26 2008-06-04 本田技研工业株式会社 蜗轮机构及搭载蜗轮机构的电动动力转向装置
US7814808B2 (en) 2004-04-26 2010-10-19 Honda Motor Co., Ltd. Worm gear mechanism and electric power steering apparatus equipped with the worm gear mechanism
JP2013190015A (ja) * 2012-03-13 2013-09-26 Asano Gear Co Ltd ギヤおよびディファレンシャル装置
KR20160049591A (ko) * 2014-10-27 2016-05-10 현대모비스 주식회사 차량용 전동 스티어링 장치의 플러그 조립체
KR102149910B1 (ko) 2014-10-27 2020-09-01 현대모비스 주식회사 차량용 전동 스티어링 장치의 플러그 조립체

Also Published As

Publication number Publication date
EP1121287A1 (fr) 2001-08-08
GB9822603D0 (en) 1998-12-09

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