EP1232066A2 - Systeme de direction par cables comportant un dispositif mecanique de secours - Google Patents

Systeme de direction par cables comportant un dispositif mecanique de secours

Info

Publication number
EP1232066A2
EP1232066A2 EP00991483A EP00991483A EP1232066A2 EP 1232066 A2 EP1232066 A2 EP 1232066A2 EP 00991483 A EP00991483 A EP 00991483A EP 00991483 A EP00991483 A EP 00991483A EP 1232066 A2 EP1232066 A2 EP 1232066A2
Authority
EP
European Patent Office
Prior art keywords
motor vehicle
steer
pinion
wire system
shaft
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.)
Withdrawn
Application number
EP00991483A
Other languages
German (de)
English (en)
Inventor
Zdravko Menjak
Ratko Menjak
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.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
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 Delphi Technologies Inc filed Critical Delphi Technologies Inc
Publication of EP1232066A2 publication Critical patent/EP1232066A2/fr
Withdrawn legal-status Critical Current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
    • B62D5/001—Mechanical components or aspects of steer-by-wire systems, not otherwise provided for in this maingroup
    • B62D5/003—Backup systems, e.g. for manual steering

Definitions

  • This disclosure relates to steer-by-wire steering systems, and, more particularly, to a steer-by-wire system having a mechanical backup device.
  • the steer-by-wire system includes a steering column having an upper end and a lower end, a hand steering device disposed on the upper end of the steering column, a lower shaft depending from the lower end of the steering column, the mechanical backup device in mechanical communication with the steering column through the lower shaft, and a rack configured to steer at least one steerable wheel of the motor vehicle in mechanical communication with the mechanical backup device.
  • the mechanical backup device includes a pinion lashedly engaged to the lower shaft to provide mechanical communication between the steering column and the rack.
  • the mechanical communication of the pinion and the lower shaft may be through a pinion shaft.
  • the lashed engagement of the pinion and the pinion shaft may be effectuated by the positioning of engaging sets of splines disposed on the pinion and the pinion shaft.
  • the steer-by-wire system may also be configured to allow the hand steering device to be adjusted in a vertical direction relative to an operator of the motor vehicle.
  • the steering column may be telescopically adjustable, or it may have an energy absorbing function incorporated therein to absorb the energy of an impact of the operator of the motor vehicle.
  • Figure 1 is a partial cutaway plan view of a steering column of steer- by-wire system having a mechanical back-up device, and tilt-wheel, telescopic, and energy-absorbing functions.
  • Figure 2 is a cutaway side elevation view of a rack and pinion assembly incorporated into a steer-by-wire system.
  • Figure 3 is a sectional view along line 4-4 of Figure 2 illustrating the intermeshing of splines within the rack and pinion assembly.
  • Figure 4 is a side elevation view of a steering column of a steer-by- wire system having a mechanical backup function and tilt-wheel, telescopic, and energy-absorbing functions.
  • a steering wheel actuator for a steer-by-wire system of a motor vehicle is shown generally at 30.
  • Steering wheel actuator 30 comprises a tube portion 32, a sleeve 34 that coaxially and slideably engages tube portion 32, an upper shaft 36 coaxially inserted through sleeve 34 and rotatably positioned between bearings 18, and position sensors 38 and torque sensors 40 operably connected to upper shaft 36.
  • Upper shaft 36 is operably connected to a hand steering device (not shown), which may be a hand steering wheel.
  • An ignition switch housing 42 is operably connected to steering wheel actuator 30.
  • the angular displacement of the hand steering device is detected by sensors 38, 40, processed, and applied to a servo motor (not shown) to move steerable wheels of the motor vehicle.
  • a lower shaft 44 is axially disposed on an end of upper shaft 36 to provide a mechanical link between upper shaft 36 and a steer-by-wire mechanical backup device (shown below with reference to Figure 2).
  • the backup device is shown generally at 50.
  • rotation of the hand steering device will continue to move the steerable wheels of the motor vehicle.
  • the hand steering device causes the axial rotation of the upper shaft and the lower shaft.
  • the lower shaft may be connected on its lower end to an intermediate shaft 52, which may be rotatably connected to a pinion shaft 54 in such a manner so as to permit play in the steering column and thereby accommodate the movement of the suspension system of the motor vehicle.
  • the steering column a lower end of which is connected to pinion shaft
  • Pinion shaft 54 is rotatably disposed in a housing 56.
  • Bearings 58 such as needle bearings, are positioned to enable pinion shaft 54 to freely spin within housing 56.
  • Pinion shaft 54 is in mechanical communication with a pinion 60, which is likewise positioned within a housing 96 and is rotatable therewithin.
  • Pinion 60 typically includes a threaded portion 62 that engages a rack 64 in a rack and pinion relationship.
  • Ball bearings 66 are positioned intermediate the ends of pinion 60 to enable pinion 60 to freely rotate within housing 96.
  • Pinion shaft 54 is not tightly connected to pinion 60 but is, however, in lashed engagement with pinion 60, thereby allowing pinion shaft 54 to rotate freely through a limited range of motion relative to pinion 60 in the event of a mechanical failure of the steer-by- wire function.
  • pinion 60 is driven by pinion shaft 54 and drives rack 64, which is positioned in a coaxial relationship with a steering rod (not shown) controllable by the steer-by-wire function, and which is fixedly connected to rack 64 to form a rack/pinion assembly 57.
  • the ends of rack 64 and the steering rod are ultimately connected to each wheel of a pair of steerable wheels.
  • a first set of splines 68 engages a second set of splines 69 to allow the free axial rotation of pinion shaft 54 within housing 56 over the above-mentioned limited range in the event of a failure of the steer-by- wire function.
  • First set of splines 68 is disposed longitudinally along the outer surface of pinion shaft 54, and a second set of splines 69 is disposed longitudinally along the inner surface of a recess formed in pinion 60.
  • first set of splines 68 and second set of splines 69 intermesh to permit the free rotation of pinion shaft 54 through about a fifteen degree angle, thereby resulting in lash in the system.
  • the splines may be dimensioned so as to allow for the lash to be less than about fifteen degrees.
  • the free rotation of pinion shaft 54 may be about ten or five degrees.
  • the actual amount of lash will generally depend on the steer-by- wire system and may be selected to ensure that the pinion shaft 54 will not engage the pinion so long as the steer-by-wire function is operational.
  • an optional tilt function for a steer-by- wire system is shown in which the hand steering device may be adjusted in a vertical direction relative to an operator of the motor vehicle.
  • a tilt function comprises a bolt 70 extending laterally through the steering column.
  • Bolt 70 allows for the pivotal motion of an upper part of the steering column thereabout, while lower shaft 44 remains in operable communication with the steerable wheels of the vehicle.
  • FIG. 4 there is also shown an optional telescopic steering column.
  • the telescopic feature is embodied by steering wheel actuator 30 being slideably engaged by a bracket 99, bolt 70, and a tensioning mechanism 74.
  • Tensioning mechanism 74 is manually articulated in one direction about a pivot point 76 to loosen upper sleeve 34, thereby allowing upper sleeve 34 to transverse the length of a slot 78 in sleeve 34 in order to be adjusted to the preferences of a driver.
  • Manual articulation of tensioning mechanism 74 in the opposite direction as the previous articulation allows upper sleeve 34 to be secured in the position preferred by the driver.
  • sleeve 34 which coaxially receives upper shaft 36, is longitudinally pressed on tube portion 32 in the event of an impact on the hand steering device that is oriented along the longitudinal axis of the steering column.
  • At least one capsule 80 is positioned at a lower end of sleeve 34 to prevent the casual use of the energy- absorbing feature.
  • capsules 80 disengage to allow sleeve 34 to be pressed onto tube portion 32.
  • a plurality of tolerance ring springs 82 positioned between sleeve 34 and tube portion 32 provide frictional resistance as sleeve 34 moves over tube portion 32, thereby cushioning the body of the operator as it impacts the hand steering device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)

Abstract

L'invention concerne un système de direction par câbles pour véhicule à moteur, qui emploie un dispositif mécanique de secours permettant de diriger mécaniquement le véhicule à moteur en cas de défaillance de la fonction de direction par câbles. Le système comprend une colonne de direction comportant une extrémité supérieure et une extrémité inférieure, un dispositif de direction manuel sur l'extrémité supérieure de la colonne de direction, un arbre inférieur sur l'extrémité inférieure de la colonne de direction ; le dispositif mécanique de secours est conçu pour être relié mécaniquement à l'arbre inférieur ; et une crémaillère capable de diriger au moins une roue orientable du véhicule à moteur reliée mécaniquement au dispositif de secours. Le dispositif mécanique de secours comprend un pignon en prise fixe avec l'arbre inférieur, qui assure une communication entre la crémaillère et la colonne de direction. La communication mécanique entre le pignon et l'arbre inférieur peut être assurée par l'intermédiaire d'un arbre de pignon. La prise fixe entre le pignon et l'arbre de pignon peut être obtenue par le positionnement d'ensembles emboîtés de cannelures situées sur le pignon et l'arbre de pignon.
EP00991483A 1999-11-16 2000-11-16 Systeme de direction par cables comportant un dispositif mecanique de secours Withdrawn EP1232066A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US16568299P 1999-11-16 1999-11-16
US165682P 1999-11-16
PCT/US2000/042204 WO2001036250A2 (fr) 1999-11-16 2000-11-16 Systeme de direction par cables comportant un dispositif mecanique de secours

Publications (1)

Publication Number Publication Date
EP1232066A2 true EP1232066A2 (fr) 2002-08-21

Family

ID=22599990

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00991483A Withdrawn EP1232066A2 (fr) 1999-11-16 2000-11-16 Systeme de direction par cables comportant un dispositif mecanique de secours

Country Status (2)

Country Link
EP (1) EP1232066A2 (fr)
WO (1) WO2001036250A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106476878A (zh) * 2015-09-01 2017-03-08 甄占波 舵轮式方向盘

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1454161A (en) * 1972-10-20 1976-10-27 Adwest Eng Ltd Steering mechanisms
JPS63180563A (ja) * 1987-01-22 1988-07-25 Honda Motor Co Ltd 電動パワ−ステアリング装置
US5230396A (en) * 1988-09-13 1993-07-27 Aisin Seiki Kabushiki Kaisha Steering control apparatus
JP2819145B2 (ja) * 1989-03-14 1998-10-30 富士重工業株式会社 ステアリングセンサの故障判定方法
US5307892A (en) * 1990-08-03 1994-05-03 Techco Corporation Electronically controlled power steering system
US5248009A (en) * 1990-09-12 1993-09-28 Nsk Ltd. Vehicle rear wheels steering apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0136250A2 *

Also Published As

Publication number Publication date
WO2001036250A2 (fr) 2001-05-25
WO2001036250A3 (fr) 2001-11-01

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