FR2657835A1 - Dual-circuit power-assisted steering system - Google Patents

Dual-circuit power-assisted steering system Download PDF

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Publication number
FR2657835A1
FR2657835A1 FR9001331A FR9001331A FR2657835A1 FR 2657835 A1 FR2657835 A1 FR 2657835A1 FR 9001331 A FR9001331 A FR 9001331A FR 9001331 A FR9001331 A FR 9001331A FR 2657835 A1 FR2657835 A1 FR 2657835A1
Authority
FR
France
Prior art keywords
cylinders
cylinder
steering system
jack
rack
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.)
Granted
Application number
FR9001331A
Other languages
French (fr)
Other versions
FR2657835B1 (en
Inventor
Mounier-Poulat Francois
Guiavarch Guy
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.)
Renault Trucks SAS
Original Assignee
Renault Vehicules Industriels SA
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 Renault Vehicules Industriels SA filed Critical Renault Vehicules Industriels SA
Priority to FR9001331A priority Critical patent/FR2657835B1/en
Publication of FR2657835A1 publication Critical patent/FR2657835A1/en
Application granted granted Critical
Publication of FR2657835B1 publication Critical patent/FR2657835B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B62D5/30—Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means
    • 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
    • B62D5/10—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 power unit
    • B62D5/12—Piston and cylinder
    • 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
    • B62D5/22—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 rack-and-pinion type

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Actuator (AREA)

Abstract

Power-assisted steering with rack and pinion, with a dual circuit of reduced size consisting of hydraulic cylinders (10, 11) placed in parallel, the pistons (16, 26) of which are connected and in which the steering rods (20, 20') are coupled to one of the cylinders; the cylinders (10, 11) and the rack (27) extend through a common support (31) carrying the means for fastening the system to the chassis of the vehicle and the means for guiding the rod (12) of the cylinder (10) which rod is coupled to the steering rods (20, 20'). Application: motor vehicle.

Description

SYSTEME DE DIRECTION ÀSSISTEE A DOUBLE CIRCUIT
L'invention concerne un système de direction assistée à pignon et crémaillère à double circuit pour véhicules automobiles qui comporte deux vérins hydrauliques dont les pistons sont reliés l'un à l'autre et dans lequel les bielles de direction qui assurent la transmission de la force des vérins aux pivots de roues d'un véhicule sont accouplées à l'un des vérins.DOUBLE-CIRCUIT ASSISTED STEERING SYSTEM
The invention relates to a dual circuit rack and pinion power steering system for motor vehicles which comprises two hydraulic cylinders, the pistons of which are connected to each other and in which the steering rods which transmit the force. cylinders to the wheel pivots of a vehicle are coupled to one of the cylinders.

La publication FR-A 2 62i 549 décrit un système dans lequel les bielles de direction sont portées par un chariot coulissant sur un tube de guidage contenant les deux vérins disposés coaxialement. Publication FR-A 2 62i 549 describes a system in which the steering rods are carried by a sliding carriage on a guide tube containing the two jacks arranged coaxially.

L'encombrement de tels systèmes ne permet pas de réaliser les montages souhaités sur les véhicules lorsque les organes du chassis occupent une position susceptible de gner le déplacement des bielles de direction.The size of such systems does not allow the desired mounting on the vehicles when the chassis members occupy a position liable to hinder the movement of the steering rods.

Pour remédier à cet inconvénient, il est connu de monter les bielles aux extrémités de la tige d'un vérin; mais ce montage ne peut convenir aux systèmes de direction assistée à double circuit dans lesquels les deux vérins ne peuvent entre disposés coax ialement. To remedy this drawback, it is known to mount the connecting rods at the ends of the rod of a jack; but this assembly cannot be suitable for dual circuit power steering systems in which the two jacks cannot be arranged coaxially.

Conformément à l'invention, le problème est résolu en ce que les vérins et la crémaillere s'étendent au travers d'un support commun portant les moyens de fixation du système au chassis du véhicule, les moyens de guidage de la tige du vérin accouplée aux bielles de direction, les moyens de support du cylindre de l'autre vérin et les moyens de support d'organes d'étanchéité.  According to the invention, the problem is solved in that the jacks and the rack extend through a common support carrying the means for fixing the system to the chassis of the vehicle, the means for guiding the rod of the jack coupled to the steering rods, the means for supporting the cylinder of the other jack and the means for supporting sealing members.

Le système ainsi réalisé possède l'avantage de pouvoir entre fabriqué et assemblé avec une grande facilité.The system thus produced has the advantage of being able to be manufactured and assembled with great ease.

Sans sortir du cadre de l'invention, il sera bien entendu possible de remplacer un vérin par un vérin à commande électrique et les deux vérins peuvent fonctionner conjointement ou séparément.Without departing from the scope of the invention, it will of course be possible to replace a jack with an electrically controlled jack and the two jacks can operate jointly or separately.

D'autres caractéristiques et avantages du système apparaîtront à la lecture de la description d'un exemple de réalisation de celui-ci faite en référence au dessin annexé dans lequel =
La figure représente le schéma fonctionnel du système. Dans le système de direction de la figure, le volant de direction 1 est relié par un arbre de direction 2 à une valve double 3 de modulation de pression. Un exemple de réalisation d'une telle valve est décrit dans la publication FR-A 2 579 548
La valve 3 est alimentée à partir d'un groupe moto-pompe 4 et fournit une pression hydraulique d'assistance en fonction du sens de manoeuvre du volant 1, aux différents raccords 5 d'alimentation des chambres 6-7 et 8-9 de deux vérins à double effet tOF il. Other characteristics and advantages of the system will appear on reading the description of an exemplary embodiment thereof made with reference to the appended drawing in which =
The figure shows the block diagram of the system. In the steering system of the figure, the steering wheel 1 is connected by a steering shaft 2 to a double valve 3 for pressure modulation. An exemplary embodiment of such a valve is described in the publication FR-A 2 579 548
The valve 3 is supplied from a motor-pump unit 4 and provides hydraulic assistance pressure as a function of the direction of operation of the flywheel 1, to the various supply connections 5 of the chambers 6-7 and 8-9 of two double acting cylinders tOF il.

Le vérin 10 est constitué par un cylindre 15 dans lequel se déplace un piston 16 qui commande le déplacement de la tige 12 à deux arbres de sorties 17, 17'. A l'extrémité de chaque arbre de sortie est vissé le boitier 18 d'une rotule 19 prolongé par la bielle correspondante 2, 20' qui commande la rotation d'un bras 21 de manoeuvre du pivot 22 de la roue du véhicule. The jack 10 is constituted by a cylinder 15 in which a piston 16 moves which controls the displacement of the rod 12 to two output shafts 17, 17 '. At the end of each output shaft is screwed the housing 18 of a ball joint 19 extended by the corresponding connecting rod 2, 20 'which controls the rotation of an arm 21 for operating the pivot 22 of the vehicle wheel.

Le vérin il est constitué par un bottier formant cylindre 25 dans lequel se déplace un piston 26 auquel sont attelés un arbre de liaison 27a et la crémaillère 27 en prise avec le pignon 28 de commande, actionné par le volant 1. L'ensemble pignon 28, son poussoir 29 est monté dans un boitier rapporté 30 sur le boïtier 25.The jack it is constituted by a boot forming a cylinder 25 in which a piston 26 moves to which are coupled a connecting shaft 27a and the rack 27 in engagement with the control pinion 28, actuated by the flywheel 1. The pinion assembly 28 , its pusher 29 is mounted in an attached box 30 on the box 25.

Selon l'invention, les vérins 10, il et la crémaillère 27 s'étendent au travers d'un support 31. Le support 31 est formé à partir de deux brides 32, 32' qui portent les vis de fixation du système à un élément de la structure non représenté du chassis du véhicule.According to the invention, the jacks 10, 11 and the rack 27 extend through a support 31. The support 31 is formed from two flanges 32, 32 'which carry the screws for fixing the system to an element of the structure, not shown, of the vehicle chassis.

Le support 31 porte également au niveau des brides 32, 32' les paliers de guidage 36, 36' des arbres 17, 17'. Les brides 32, 32' portent, par ailleurs, les moyens de support et de rétention du cylindre 25 du vérin 11. The support 31 also carries at the flanges 32, 32 'the guide bearings 36, 36' of the shafts 17, 17 '. The flanges 32, 32 ′ also carry the means for supporting and retaining the cylinder 25 of the jack 11.

Le système est complété par la plaque 44 de liaison de l'arbre 17' du vérin 10 avec l'arbre 27a.The system is completed by the plate 44 for connecting the shaft 17 'of the jack 10 with the shaft 27a.

Les brides 32, 32' portent également l'ensemble des moyens de retenue des soufflets d'étanchéité 41, 42 destinés à éviter l'intrusion des impuretés et salissures dans les vérins 10, 11. The flanges 32, 32 ′ also carry all of the means for retaining the sealing bellows 41, 42 intended to prevent the intrusion of impurities and dirt in the jacks 10, 11.

Cette disposition a l'avantage de permettre d'obtenir des efforts impotants au niveau d'un vérin 10 autorisant son emploi sur des véhicules lourds et d'autre part, de permettre l'utilisation d'un bottier tel que 25 dans un système de direction connu. This arrangement has the advantage of making it possible to obtain substantial forces at the level of a jack 10 authorizing its use on heavy vehicles and on the other hand, to allow the use of a shoemaker such as 25 in a system of known direction.

En effet, les efforts principaux sont fournis par le vérin 10 dont l'alimentation en huile est contrôlée par la valve 3. Le vérin Il alimenté par un circuit hydraulique distinct, mais contralé par la même valve 3, fournit le supplément d'effort nécessaire.Indeed, the main forces are supplied by the jack 10, the oil supply of which is controlled by the valve 3. The jack II supplied by a separate hydraulic circuit, but controlled by the same valve 3, provides the additional effort required .

La séparation des deux circuits d'huile alimentant respectivement les vérins 10 et 11 assure la sécurité du système.The separation of the two oil circuits supplying the jacks 10 and 11 respectively ensures the safety of the system.

Par ailleurs, le système conforme à l'invention permet d'avoir des sections utiles des vérins 10, il identiques dans les deux sens de mouvement.Furthermore, the system according to the invention makes it possible to have useful sections of the jacks 10, which are identical in both directions of movement.

L'élément de bottier 30 contenant l'engrément par le pignon 28 supporte la valve 3 et peut entre orienté indifféremment en rotation autour du boïtier 25 et être éloigné, selon les besoins, du plan de symétrie du véhicule.The boot element 30 containing the embellishment by the pinion 28 supports the valve 3 and can between it rotated either around the case 25 and be distant, as necessary, from the plane of symmetry of the vehicle.

La compacité du système est réalisée du fait que les deux seules parties tubulaires parallèles peuvent être très proches l'une de l'autre.The compactness of the system is achieved by the fact that the only two parallel tubular parts can be very close to each other.

On remarque aussi qu'une variante du système simplifiée peut être réalisée par suppression du vérin 11 et du circuit hydraulique correspondant, tout en conservant la fonction de guidage et entrainement de l'arbre 27a. It is also noted that a variant of the simplified system can be produced by eliminating the jack 11 and the corresponding hydraulic circuit, while retaining the function of guiding and driving the shaft 27a.

Claims (2)

REVENDICATIONS 1 ) Système de direction assistée à pignon et1) Pinion assisted steering system and crémaillère à double circuit qui comporte deux dual circuit rack which has two vérins hydrauliques 10, 11) dont les pistons hydraulic cylinders 10, 11) including pistons (16, 26) sont reliés l'un à l'autre et dans (16, 26) are connected to each other and in lequel les bielles (2, 20') de direction qui which the connecting rods (2, 20 ') which assurent la transmission de la force des ensure the transmission of the force of vérins (1 11) sont accouplées à l'un des cylinders (1 11) are coupled to one of the vérins, caractérisé par le fait que les vérins cylinders, characterized in that the cylinders (10, 11) et la crémaillère (27) s'étendent au (10, 11) and the rack (27) extend to the travers d'un support commun (31) portant les through a common support (31) carrying the moyens de fixation du système au chassis du means of fixing the system to the chassis of the véhicule, les moyens de guidage de la tige vehicle, the rod guide means (12) du vérin (10) accouplée aux bielles (20, (12) of the jack (10) coupled to the connecting rods (20, 20') de direction, les moyens de support et de 20 ') of direction, the means of support and rétention du cylindre (25) de l'autre vérin retention of the cylinder (25) of the other cylinder (11) et les moyens de support d'organes (11) and the means for supporting organs d'étanchéité. sealing. 20) Système de direction selon la revendication 1,20) Steering system according to claim 1, caractérisé par le fait que le support (31) characterized by the fact that the support (31) des vérins (10, 11) est formé à partir de deux cylinders (10, 11) is formed from two brides (32, 32') portant les paliers de flanges (32, 32 ') bearing the bearings guidage (36! 36') des arbres de sortie (17, guide (36! 36 ') of the output shafts (17, 17') du premier vérin (10) et les moyens de 17 ') of the first cylinder (10) and the means of support du cylindre (25) de l'autre vérin  cylinder support (25) of the other cylinder
FR9001331A 1990-02-06 1990-02-06 DUAL CIRCUIT ASSISTED STEERING SYSTEM. Expired - Lifetime FR2657835B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9001331A FR2657835B1 (en) 1990-02-06 1990-02-06 DUAL CIRCUIT ASSISTED STEERING SYSTEM.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9001331A FR2657835B1 (en) 1990-02-06 1990-02-06 DUAL CIRCUIT ASSISTED STEERING SYSTEM.

Publications (2)

Publication Number Publication Date
FR2657835A1 true FR2657835A1 (en) 1991-08-09
FR2657835B1 FR2657835B1 (en) 1992-04-17

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Application Number Title Priority Date Filing Date
FR9001331A Expired - Lifetime FR2657835B1 (en) 1990-02-06 1990-02-06 DUAL CIRCUIT ASSISTED STEERING SYSTEM.

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FR (1) FR2657835B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010049359A1 (en) * 2008-10-27 2010-05-06 Agco Gmbh Steering devices

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1295433A (en) * 1968-09-20 1972-11-08
FR2133440A5 (en) * 1971-04-16 1972-11-24 Zahnradfabrik Friedrichshafen
EP0188158A2 (en) * 1985-01-14 1986-07-23 Bendix Espana S.A. Compact servosteering mechanism for an automotive vehicle
JPS6291369A (en) * 1985-10-17 1987-04-25 Hino Motors Ltd Steering system used for vehicle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1295433A (en) * 1968-09-20 1972-11-08
FR2133440A5 (en) * 1971-04-16 1972-11-24 Zahnradfabrik Friedrichshafen
EP0188158A2 (en) * 1985-01-14 1986-07-23 Bendix Espana S.A. Compact servosteering mechanism for an automotive vehicle
JPS6291369A (en) * 1985-10-17 1987-04-25 Hino Motors Ltd Steering system used for vehicle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 11, no. 301 (M-628), 30 septembre 1987; & JP-A-62 091 369 (HINO MOTORS) 25-04-1987 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010049359A1 (en) * 2008-10-27 2010-05-06 Agco Gmbh Steering devices

Also Published As

Publication number Publication date
FR2657835B1 (en) 1992-04-17

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