FR2920390A1 - Assistance module for e.g. electrical power steering, of motor vehicle, has input shaft rotatably guided in case by external bearing and in output unit by internal bearing, and elastic joint placed between input shaft and internal bearing - Google Patents

Assistance module for e.g. electrical power steering, of motor vehicle, has input shaft rotatably guided in case by external bearing and in output unit by internal bearing, and elastic joint placed between input shaft and internal bearing Download PDF

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Publication number
FR2920390A1
FR2920390A1 FR0706225A FR0706225A FR2920390A1 FR 2920390 A1 FR2920390 A1 FR 2920390A1 FR 0706225 A FR0706225 A FR 0706225A FR 0706225 A FR0706225 A FR 0706225A FR 2920390 A1 FR2920390 A1 FR 2920390A1
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FR
France
Prior art keywords
input shaft
bearing
assistance module
power steering
output unit
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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
FR0706225A
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French (fr)
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FR2920390B1 (en
Inventor
Patrick Vidal
Thierry Barmes
Philippe Chauvrat
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JTEKT Europe SAS
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JTEKT Europe SAS
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Publication date
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Priority to FR0706225A priority Critical patent/FR2920390B1/en
Priority to DE102008045951.8A priority patent/DE102008045951B4/en
Publication of FR2920390A1 publication Critical patent/FR2920390A1/en
Application granted granted Critical
Publication of FR2920390B1 publication Critical patent/FR2920390B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
    • F16C27/06—Elastic or yielding bearings or bearing supports, for exclusively rotary movement by means of parts of rubber or like materials
    • F16C27/063—Sliding contact bearings
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
    • B62D6/08—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque
    • B62D6/10—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque characterised by means for sensing or determining torque

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

Abstract

The module has an input shaft (4) and an output unit e.g. pinion (3) or output shaft, placed inside a case. The input shaft and the output unit are rotatably mounted along a common axis and connected by a torsion rod (6), where the rod is placed along the axis. The input shaft is rotatably guided in the case by an external rolling bearing and in the output unit by an internal journal bearing (12). An annular elastic joint (13) e.g. O-ring joint, is placed between the input shaft and the internal bearing.

Description

La présente invention concerne un module d'assistance pour direction assistée de véhicule automobile. Un module d'assistance classique comprend, à l'intérieur d'un carter, un arbre d'entrée et un organe de sortie, tel qu'un pignon ou un arbre de sortie, montés rotatifs sensiblement suivant un axe commun et liés par l'intermédiaire d'une barre de torsion disposée suivant ledit axe, l'arbre d'entrée étant guidé en rotation dans le carter par un palier extérieur, et dans l'organe de sortie par un palier intérieur. Pour certains types de directions assistées, notamment pour les directions assistées hydrauliques, l'organe de sortie est un pignon destiné à venir en prise avec une crémaillère de la direction. Dans le cas d'une direction assistée hydraulique, le module d'assistance constitue une valve d'assistance. Pour d'autres types de directions assistées, l'organe de sortie est un arbre de sortie destiné à être accouplé avec un arbre intermédiaire, lui- même accouplé avec un pignon venant en prise avec une crémaillère de la direction. Dans une direction assistée de véhicule automobile, le couple ou l'effort d'assistance fourni par la direction assistée pour soulager le conducteur du véhicule est asservi au couple exercé par le conducteur sur le volant de conduite du véhicule, aussi désigné comme couple au volant. A cet effet, le couple au volant est déterminé en mesurant la rotation relative entre l'arbre d'entrée et l'organe de sortie. Un tel module d'assistance nécessite la réalisation d'un jeu entre l'arbre d'entrée et le palier intérieur de manière à limiter les frottements entre ces deux éléments afin de pouvoir déterminer avec précision le couple au volant. Toutefois, dans certaines conditions de roulage du véhicule, l'arbre d'entrée d'un tel module d'assistance est susceptible de générer des bruits et vibrations liés à ses déplacements parasites autorisés par ce jeu. The present invention relates to an assistance module for power steering of a motor vehicle. A conventional assistance module comprises, inside a casing, an input shaft and an output member, such as a pinion or an output shaft, rotatably mounted substantially along a common axis and connected by means of a housing. intermediate of a torsion bar disposed along said axis, the input shaft being guided in rotation in the housing by an outer bearing, and in the output member by an inner bearing. For certain types of power steering, especially for hydraulic power steering, the output member is a pinion intended to engage with a rack of the steering. In the case of a hydraulic power steering, the assistance module constitutes an assistance valve. For other types of power steering, the output member is an output shaft intended to be coupled with an intermediate shaft, itself coupled with a pinion engaging with a rack of the direction. In a motor vehicle power steering, the torque or assistance effort provided by the power steering to relieve the driver of the vehicle is dependent on the torque exerted by the driver on the steering wheel of the vehicle, also referred to as steering wheel torque. . For this purpose, the steering wheel torque is determined by measuring the relative rotation between the input shaft and the output member. Such a support module requires the realization of a clearance between the input shaft and the inner bearing so as to limit the friction between these two elements in order to accurately determine the steering wheel torque. However, under certain vehicle running conditions, the input shaft of such an assistance module is capable of generating noise and vibrations related to its parasitic movements authorized by this game.

La présente invention vise à remédier à ces inconvénients, et de manière avantageuse elle consiste à fournir un module d'assistance permettant de limiter les bruits et vibrations générés par l'arbre d'entrée, tout en conservant des frottements négligeables entre l'arbre d'entrée et le palier intérieur. The present invention aims to overcome these disadvantages, and advantageously it consists in providing an assistance module for limiting the noise and vibrations generated by the input shaft, while maintaining negligible friction between the drive shaft. entrance and the inner landing.

A cet effet, la présente invention concerne un module d'assistance pour direction assistée de véhicule automobile, comprenant, à l'intérieur d'un carter, un arbre d'entrée et un organe de sortie, tel qu'un pignon ou un arbre de sortie, montés sensiblement suivant un axe commun et liés par l'intermédiaire d'une barre de torsion disposée suivant ledit axe, l'arbre d'entrée étant guidé en rotation dans le carter par un palier extérieur, et dans l'organe de sortie par un palier intérieur, caractérisé en ce que des moyens d'amortissement élastiques sont disposés entre l'arbre d'entrée et le palier intérieur. La présence de ces moyens d'amortissement élastiques permet d'une part de réduire le jeu entre l'arbre d'entrée et le palier intérieur et donc de limiter les mouvements de l'arbre d'entrée par rapport au palier intérieur, et d'autre part d'amortir le déplacement de l'arbre d'entrée lorsque celui-ci se déplace par rapport au palier intérieur. Il en résulte une importante diminution des bruits et vibrations générés par l'arbre d'entrée durant ses déplacements parasites. Avantageusement, les moyens d'amortissement élastiques 15 comportent au moins un joint élastique et le palier intérieur ou l'arbre d'entrée comporte des moyens de fixation de chaque joint élastique. De préférence, le joint élastique est un joint annulaire. Les moyens de fixation du joint élastique peuvent comporter une gorge annulaire ménagée sur l'arbre d'entrée ou sur le palier intérieur et dans 20 laquelle est montée le joint élastique. De toute façon l'invention sera bien comprise à l'aide de la description qui suit en référence au dessin schématique annexé représentant, à titre d'exemple non limitatif, une forme d'exécution de ce module d'assistance. 25 Figure 1 est une vue en coupe longitudinale d'un module d'assistance selon l'invention. Figure 2 est une vue à l'échelle agrandie d'un détail A de figure 1. La figure 1 représente un module d'assistance 2 pour direction assistée électrique sur pignon de véhicule automobile. 30 Le moclule d'assistance 2 comprend un pignon 3 et un arbre d'entrée 4 montés rotatifs suivant un axe commun B dans un carter 5. L'arbre d'entrée 4 et le pignon 3 sont liés par l'intermédiaire d'une barre de torsion 6 disposée à l'intérieur de l'arbre d'entrée 4 suivant l'axe B. Une extrémité de la barre de torsion 6 est encastrée dans le pignon 35 3 tandis que son autre extrémité est liée en rotation, par une goupille 7, avec l'extrémité extérieure de l'arbre d'entrée 4. To this end, the present invention relates to an assistance module for power steering of a motor vehicle, comprising, inside a housing, an input shaft and an output member, such as a pinion or a shaft of output, mounted substantially along a common axis and connected via a torsion bar disposed along said axis, the input shaft being guided in rotation in the housing by an outer bearing, and in the body of output by an inner bearing, characterized in that elastic damping means are arranged between the input shaft and the inner bearing. The presence of these elastic damping means makes it possible on the one hand to reduce the clearance between the input shaft and the inner bearing and thus to limit the movements of the input shaft relative to the inner bearing, and on the other hand to dampen the displacement of the input shaft when it moves relative to the inner bearing. This results in a significant decrease in the noise and vibrations generated by the input shaft during its parasitic movements. Advantageously, the elastic damping means 15 comprise at least one elastic seal and the inner bearing or the input shaft comprises means for fixing each elastic seal. Preferably, the elastic seal is an annular seal. The means for fixing the elastic seal may comprise an annular groove formed on the input shaft or on the inner bearing and in which the elastic seal is mounted. In any case the invention will be better understood with the aid of the description which follows with reference to the appended schematic drawing showing, by way of non-limiting example, a form of execution of this assistance module. Figure 1 is a longitudinal sectional view of an assistance module according to the invention. Figure 2 is an enlarged view of a detail A of Figure 1. Figure 1 shows a support module 2 for electric power steering on a motor vehicle pinion. The assistance motor 2 comprises a pinion 3 and an input shaft 4 rotatably mounted along a common axis B in a housing 5. The input shaft 4 and the pinion 3 are connected via a torsion bar 6 disposed inside the input shaft 4 along the axis B. One end of the torsion bar 6 is embedded in the pinion 35 3 while its other end is rotatably connected by a pin 7, with the outer end of the input shaft 4.

Le pignon 3 est guidé en rotation dans le carter 5 par deux paliers à roulement 8, 9 tandis que l'arbre d'entrée 4 est guidé en rotation dans le carter 5 par un palier à roulement extérieur 11, et dans le pignon 3 par un palier lisse intérieur 12. The pinion 3 is guided in rotation in the housing 5 by two rolling bearings 8, 9 while the input shaft 4 is guided in rotation in the housing 5 by an outer rolling bearing 11, and in the pinion 3 by an inner plain bearing 12.

L'arbre d'entrée 4 est lié en rotation, par son extrémité éloignée du pignon 3, à la colonne de direction (non représentée) du véhicule concerné, tandis que le pignon 3 vient en prise, par son extrémité éloignée de l'arbre d'entrée 4, avec une crémaillère (non représentée) de la direction. Comme montré plus particulièrement sur la figure 2, des moyens 10 d'amortissement élastiques sont disposés entre l'arbre d'entrée 4 et le palier intérieur 12. Ces moyens d'amortissement élastiques comportent un joint annulaire élastique 13 disposé dans une gorge annulaire 14 ménagée sur la surface extérieure cle l'arbre d'entrée 4.The input shaft 4 is connected in rotation, by its end remote from the pinion 3, to the steering column (not shown) of the vehicle concerned, while the pinion 3 engages, at its end remote from the shaft input 4, with a rack (not shown) of the direction. As shown more particularly in FIG. 2, elastic damping means 10 are arranged between the input shaft 4 and the inner bearing 12. These elastic damping means comprise an elastic annular seal 13 disposed in an annular groove 14 arranged on the outer surface of the input shaft 4.

15 Il doit être noté que la profondeur de la gorge annulaire 14 et que le diamètre du joint annulaire 13 sont définis de manière à ce que le joint annulaire 13 fasse saillie hors de la gorge annulaire 14 lorsque ce dernier est monté dans la gorge annulaire 14. Selon un mode de réalisation de l'invention, le joint annulaire 13 est 20 un joint torique. Comme il va de soi, l'invention ne se limite pas à la seule forme d'exécution de ce module d'assistance, décrite ci-dessus à titre d'exemple, elle en embrasse au contraire toutes les variantes de réalisation et d'application respectant le même principe. C'est ainsi notamment que la gorge annulaire 14 25 pourrait être ménagée sur la surface intérieure du palier intérieur 12. De même, le module d'assistance selon l'invention pourrait être utilisé pour tout type de direction assistée, que celle-ci soit électrique, hydraulique ou autre, en adaptant l'organe de sortie. En particulier, dans le cas d'une direction assistée électrique sur colonne, l'organe de sortie ne serait pas un pignon mais un arbre 30 de sortie, accouplé à un arbre intermédiaire. It should be noted that the depth of the annular groove 14 and the diameter of the annular seal 13 are defined so that the annular seal 13 protrudes out of the annular groove 14 when the annular groove 14 is mounted in the annular groove 14 According to one embodiment of the invention, the annular seal 13 is an O-ring. As goes without saying, the invention is not limited to the sole embodiment of this assistance module, described above as an example, it encompasses all the variants of embodiment and application respecting the same principle. Thus, in particular, the annular groove 14 could be formed on the inner surface of the inner bearing 12. Similarly, the assistance module according to the invention could be used for any type of assisted steering, whether this be electric, hydraulic or other, adapting the output member. In particular, in the case of an electric power steering column, the output member would not be a pinion but an output shaft 30, coupled to an intermediate shaft.

Claims (4)

REVENDICATIONS 1. Module d'assistance (2) pour direction assistée de véhicule automobile, comprenant, à l'intérieur d'un carter (5), un arbre d'entrée (4) et un organe de sortie, tel qu'un pignon (3) ou un arbre de sortie, montés rotatifs sensiblement suivant un axe commun (B) et liés par l'intermédiaire d'une barre de torsion (6) disposée suivant ledit axe, l'arbre d'entrée (4) étant guidé en rotation dans le carter (5) par un palier extérieur (11), et dans l'organe de sortie par un palier intérieur (12), caractérisé en ce que des moyens d'amortissement élastiques (13) sont disposés entre l'arbre d'entrée et le palier intérieur. 1. Assistance module (2) for power steering of a motor vehicle, comprising, inside a housing (5), an input shaft (4) and an output member, such as a pinion ( 3) or an output shaft, rotatably mounted substantially along a common axis (B) and connected via a torsion bar (6) disposed along said axis, the input shaft (4) being guided by rotation in the housing (5) by an outer bearing (11), and in the output member by an inner bearing (12), characterized in that elastic damping means (13) are arranged between the shaft entrance and the inner landing. 2. Module d'assistance selon la revendication 1, caractérisé en ce que les moyens d'amortissement élastiques comportent au moins un joint élastique (13) et en ce que le palier intérieur ou l'arbre d'entrée comporte des moyens de fixation de chaque joint élastique. 2. Assistance module according to claim 1, characterized in that the resilient damping means comprise at least one elastic seal (13) and in that the inner bearing or the input shaft comprises means for fixing the each elastic seal. 3. Module d'assistance selon la revendication 2, caractérisé en ce que le joint élastique (13) est un joint annulaire. 3. Assistance module according to claim 2, characterized in that the elastic seal (13) is an annular seal. 4. Module d'assistance selon la revendication 3, caractérisé en ce que les moyens de fixation du joint élastique comportent une gorge annulaire (14) ménagée sur l'arbre d'entrée ou sur le palier intérieur et dans laquelle est montée le joint élastique (13). 4. Assistance module according to claim 3, characterized in that the means for fixing the elastic seal comprise an annular groove (14) formed on the input shaft or on the inner bearing and in which is mounted the elastic seal (13).
FR0706225A 2007-09-05 2007-09-05 ASSISTED ASSISTANCE MODULE FOR MOTOR VEHICLE ASSISTED STEERING Expired - Fee Related FR2920390B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR0706225A FR2920390B1 (en) 2007-09-05 2007-09-05 ASSISTED ASSISTANCE MODULE FOR MOTOR VEHICLE ASSISTED STEERING
DE102008045951.8A DE102008045951B4 (en) 2007-09-05 2008-09-04 Servo module for a motor vehicle power steering

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Application Number Priority Date Filing Date Title
FR0706225A FR2920390B1 (en) 2007-09-05 2007-09-05 ASSISTED ASSISTANCE MODULE FOR MOTOR VEHICLE ASSISTED STEERING

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FR2920390A1 true FR2920390A1 (en) 2009-03-06
FR2920390B1 FR2920390B1 (en) 2009-12-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2982231A1 (en) * 2011-11-08 2013-05-10 Jtekt Europe Sas ASSISTANCE MODULE FOR VEHICLE ASSISTED STEERING SYSTEM

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102730053B (en) * 2011-03-29 2016-08-03 光阳工业股份有限公司 The all-terrain vehicle electronic steering device of tool limit function

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3348887A (en) * 1965-03-04 1967-10-24 Black & Decker Mfg Co Combination tolerance ring and bearing journal member
FR2433129A1 (en) * 1978-08-07 1980-03-07 Elges Helmut Self-aligning plain journal bearing - has O=rings between inner ring and housing to accommodate tolerances and reduce noise
FR2528786A1 (en) * 1982-06-18 1983-12-23 Cam Gears Ltd POWER SUPPLY STEERING GEAR
US6041885A (en) * 1997-07-01 2000-03-28 Honda Giken Kogyo Kabushiki Kaisha Electric power steering apparatus
US20030183442A1 (en) * 2002-03-29 2003-10-02 Koyo Seiko Co., Ltd. Vehicle steering apparatus
DE102005006210A1 (en) * 2005-02-11 2006-08-17 Schaeffler Kg Bearing arrangement, in particular for rolling bearings and plain bearings

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006027578A (en) * 2004-07-22 2006-02-02 Kayaba Ind Co Ltd Power steering device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3348887A (en) * 1965-03-04 1967-10-24 Black & Decker Mfg Co Combination tolerance ring and bearing journal member
FR2433129A1 (en) * 1978-08-07 1980-03-07 Elges Helmut Self-aligning plain journal bearing - has O=rings between inner ring and housing to accommodate tolerances and reduce noise
FR2528786A1 (en) * 1982-06-18 1983-12-23 Cam Gears Ltd POWER SUPPLY STEERING GEAR
US6041885A (en) * 1997-07-01 2000-03-28 Honda Giken Kogyo Kabushiki Kaisha Electric power steering apparatus
US20030183442A1 (en) * 2002-03-29 2003-10-02 Koyo Seiko Co., Ltd. Vehicle steering apparatus
DE102005006210A1 (en) * 2005-02-11 2006-08-17 Schaeffler Kg Bearing arrangement, in particular for rolling bearings and plain bearings

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2982231A1 (en) * 2011-11-08 2013-05-10 Jtekt Europe Sas ASSISTANCE MODULE FOR VEHICLE ASSISTED STEERING SYSTEM
EP2591982A1 (en) 2011-11-08 2013-05-15 Jtekt Europe Assistance module for a power steering system of a vehicle

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DE102008045951A1 (en) 2009-04-23
DE102008045951B4 (en) 2017-12-28
FR2920390B1 (en) 2009-12-04

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