WO2019029865A1 - Dispositif d'application d'une crémaillère - Google Patents

Dispositif d'application d'une crémaillère Download PDF

Info

Publication number
WO2019029865A1
WO2019029865A1 PCT/EP2018/065249 EP2018065249W WO2019029865A1 WO 2019029865 A1 WO2019029865 A1 WO 2019029865A1 EP 2018065249 W EP2018065249 W EP 2018065249W WO 2019029865 A1 WO2019029865 A1 WO 2019029865A1
Authority
WO
WIPO (PCT)
Prior art keywords
rack
leaf spring
wedge
pressure piece
upper wedge
Prior art date
Application number
PCT/EP2018/065249
Other languages
German (de)
English (en)
Inventor
Steffen Schwarzer
Bjoern SCHLEICH
Julian Bosch
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2019029865A1 publication Critical patent/WO2019029865A1/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
    • B62D3/123—Steering gears mechanical of rack-and-pinion type characterised by pressure yokes
    • 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
    • F16H55/26—Racks
    • 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
    • F16H55/26—Racks
    • F16H55/28—Special devices for taking up backlash

Definitions

  • the invention relates to a device for pressing a rack on a standing with the rack engaging pinion, in particular for a rack and pinion steering of a motor vehicle, with a loadable in the direction of the rack pressure piece, according to the closer defined in the preamble of claim 1 Art.
  • a generic device is known from DE 10 2005 005 400 AI.
  • Another such device with a pressure piece describes, for example, DE 10 2008 054 782 B4.
  • the pressure piece is formed as a round slide bearing element in the known solutions, which is arranged in a housing bore at the level of the meshing engagement between the rack and the steering pinion.
  • the axially displaceable pressure piece can be brought and biased during assembly in the desired position in conjunction with a compression spring, so that a possible noiseless and backlash interlocking engagement and a possible play-free plain bearing of axial strokes of the Rack are allowed.
  • the so-called pressure piece clearance so the possible relative movement of the sprung pressure piece relative to the steering housing in the axial direction, set.
  • the correct adjustment of the pressure piece play is essential for the steering behavior of a motor vehicle since it influences the noise and friction behavior of the rack and pinion steering gear.
  • a plate spring arranged in the pressure element component tolerances can be compensated with the help of a constructively predetermined basic game.
  • a simplified adjustment process is possible in this way.
  • the known solutions usually have an adjusting device with which the pressure piece is automatically adjusted in case of wear, for example between the rack and the pinion. This should be avoided by wear resulting, increasing axial pressure piece clearance and the resulting noise.
  • a disadvantage of the known solutions is the fact that the pressure piece game must be taken in a radially extending away from the housing housing dome, which can result in considerable space problems. Also, the adjustment process during assembly of the pressure piece is very complex and therefore expensive. Another disadvantage of the known solutions is the resulting in an increase in the pressure piece clearance due to wear noise.
  • this object is achieved by the features mentioned in claim 1.
  • a force acting in the axial direction can be converted into a force acting in the radial direction.
  • the force acting on the rack force can thus be applied in the axial direction, which allows a much simplified construction of the device according to the invention.
  • the device according to the invention by the displacement of the wedge elements relative to each other by means of the adjusting device ensures both a self-adjustment of the pressure piece and the automatic Nach- position thereof for wear compensation. This eliminates the complex and time-consuming adjustment process of the steering clearance during assembly.
  • the solution according to the invention ensures that the play resulting from wear between the rack and the pinion is compensated for.
  • the wedge surfaces have a self-locking same generating angle. Thereby, a movement of the wedge elements is prevented against the intended direction, so that the two wedge elements can not move against each other so that the load on the rack is reduced.
  • a very simple possibility for applying a force in the axial direction to the pressure piece is obtained if a leaf spring acting on the adjusting device acts on an upper wedge element facing away from the rack.
  • the leaf spring in a central region has a step with which the leaf spring is supported on a rack housing the housing.
  • a further advantageous embodiment of the invention may consist in that the upper wedge element has a projection extending in the direction of the step, wherein there is a gap between the step of the leaf spring and the upper wedge element. This results in an improved adaptation of the leaf spring to the upper wedge element.
  • the two wedge elements are designed as a ring segment and extend over an angle of a maximum of 180 °.
  • a simple embodiment of the adjusting device is obtained when an upper wedge element facing away from the rack is supported on a base body via at least one spring element belonging to the adjusting device.
  • the at least one spring element, the base body and the pressure piece are mounted in the axial direction in the housing enclosing the rack. In this way, a very simple installation and a small space requirement of the device according to the invention.
  • Fig. 1 is a side view of a device according to the invention
  • Fig. 2 is a perspective view of the device of Fig. 1;
  • Fig. 3 is an exploded view of a part of the device of Fig. 2;
  • Fig. 4 is an enlarged front view of the device of Fig. 2;
  • Fig. 5 shows an alternative embodiment of the device.
  • Fig. 1 shows a device 1, which serves for pressing a rack 2 of a not shown in its entirety rack and pinion steering of a motor vehicle to a standing with the rack 2 meshing pinion 3.
  • the rack 2 is received in a manner known per se in a housing 4 in the direction indicated by "x" axially displaceable manner.
  • the device 1 furthermore has a pressure piece 5 which can be loaded in the direction of the toothed rack 2, that is to say in the radial direction denoted by "z", and an adjusting device 6 which acts on the pressure piece 5.
  • the adjusting device 6 serves to apply the load to the pressure piece 5, in order in this way ultimately to press the rack 2 against the pinion 3 in order to adjust the clearance between the rack 2 and the pinion 3.
  • the pressure piece 5 is made in two parts in the present case and has two mutually displaceable wedge elements 7 and 8.
  • the two wedge elements 7 and 8 are each formed as a ring segment and extend over an angle of at most 180 °, in the present case over an angle of about 160 °.
  • the two wedge elements 7 and 8 have respective, mutually facing and mitei- Nander corresponding wedge surfaces 7a and 8a.
  • One of these wedge elements which is referred to below as the upper wedge element 7, is supported on at least one base element 10 belonging to the adjuster 6 spring element 9.
  • the force exerted by the at least one spring element 9 acts in the axial direction x on the upper wedge element 7.
  • the other, hereinafter referred to as the lower wedge element 8 wedge element is on the one hand with the upper wedge element 7 and on the other hand with the rack 2 in contact.
  • the lower wedge element 8 of the pressure piece 5 also assumes the function of storage and management of the rack second
  • spring elements 9 are provided, but it could also be provided a larger or possibly smaller number of spring elements 9.
  • the spring elements 9 are formed as coiled compression springs. However, it would also be conceivable to use other types of springs in order to apply a force in the axial direction x to the upper wedge element 7 of the pressure piece 5.
  • the wedge surfaces 7a and 8a of the two wedge elements 7 and 8 correspond to each other such that a displacement of one of the wedge elements 7,8 in the axial load direction x causes a radial load on the rack 2.
  • the force in the axial direction x is applied by the spring elements 9.
  • the wedge surface 7a of the upper wedge element 7 is inclined counter to the direction of the arrow x, i. H.
  • the upper wedge element 7 has a greater thickness on the side facing the main body 10 than on the side facing away from the main body 10.
  • the wedge surface 8a of the lower wedge member 8 is inclined in the arrow direction x, i. H. the lower wedge element 8 has a greater thickness on the side facing away from the main body 10 than on the side facing the main body 10.
  • the wedge surfaces 7a and 8a are each designed with an angle which produces a self-locking between the two wedge surfaces 7a and 8a. testifies. Preferably, this is an angle of less than 7 °. Of course, the size of this angle depends on the friction between the wedge elements 7 and 8.
  • the adjusting device 6 further comprises a leaf spring 11 which acts on the upper wedge element 7.
  • the leaf spring 11 and the upper wedge element 7 are formed on their mutually facing surfaces so that the leaf spring 11 bears against the upper wedge element 7 at at least two points remote from one another.
  • FIGS. 4 and 5 it can be seen very clearly that the leaf spring 11 bears in each case in the outer region of the upper wedge element 7.
  • a suitable introduction of force into the upper wedge element 7 is achieved, so that it is pressed onto the rack 2 in the radial direction z.
  • the two wedge surfaces 7a and 8a of the wedge elements 7 and 8 thus assume in combination with the spring elements 9 and the leaf spring 11, the system bias of the device first
  • the spring elements 9 which are supported on the main body 10 move the upper wedge element 7 in the axial direction x and thus build on the wedge surfaces 7a and 8a a biasing force acting in the radial direction z.
  • This biasing force is a defined force in the direction z, which holds the rack 2 and the pinion 3 in a meshing engagement with little play. As a result, an equilibrium of forces arises between the spring elements 9, the leaf spring 11 and the rack 2.
  • the described biasing force is used with which the upper wedge element 7 is pressed in the axial direction x and the lower wedge element 8 is held in permanent contact with the rack 2.
  • the spring elements 9 effect a displacement of the upper wedge element 7 in the direction of the arrow x, which however opposes the lower wedge element 8.
  • An actual displacement of the upper wedge element 7 results only when the rack 2 or the pinion 3 is worn, since in this case the lower wedge element 8 can be displaced in the radial direction z.
  • the spring elements 9 ensure wear compensation of the device 1, whereas the leaf spring 11, regardless of the position of the wedge elements 7 and 8, applies a permanent force to the upper wedge element 7 and thus also to the lower wedge element 8 and thus also to the rack 2 ,
  • the leaf spring 11 in the housing 4.
  • the leaf spring 11 has a step 12, with which the leaf spring 11 is supported on the housing 4 receiving the rack 2.
  • the upper wedge element 7 has a projection 13 extending in the direction of the step 12 of the leaf spring 11. Between the projection 13 of the upper wedge element 7 and the step 12 of the leaf spring 11, a gap 14 is present in the unloaded state of the device 1. Due to the size of the
  • the upper wedge member 7 ensures optimum initiation of the force generated by the leaf spring 11 on the pressure piece 5.
  • the upper wedge member 7 is designed so that the leaf spring 11 can be supported in the outer regions of the same.
  • the preassembled module consisting of the two wedge elements 7 and 8, the leaf spring 11, the spring elements 9 and the Base body 11 is applied to the rack 2 and pushed up to a defined position in the housing 4.
  • the upper wedge element 7 is supported via the spring elements 9 on the main body 10, which is likewise inserted into the housing 4.
  • the main body 10 can also assume an emergency function for the rack 2.
  • the entire adjusting device 6 is thus accommodated within the housing 4. After this assembly takes place based on the structural design of the device 1, an automatic adjustment of the desired game between the rack 2 and the pinion. 3
  • the housing 4 and the base body 10 may for example consist of an aluminum material. This ensures a similar or identical temperature expansion of these two components.
  • FIG. 5 shows an alternative embodiment of the device 1.
  • the housing 4 has a projection 15 which extends in the direction of the leaf spring 11.
  • the leaf spring 11 is designed without the projection 13 present in FIG. 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Transmission Devices (AREA)

Abstract

L'invention concerne un dispositif (1) permettant d'appliquer une crémaillère (2) contre un pignon (3) engrené avec la crémaillère (2), en particulier pour une direction à crémaillère d'un véhicule à moteur, ledit dispositif comprenant une pièce de pression (5) pouvant être sollicitée en direction de la crémaillère (2) et un dispositif de rattrapage de jeu (6) agissant sur la pièce de pression (5) et permettant d'exercer la sollicitation sur ladite pièce de pression (5). La pièce de pression (5) présente deux éléments cunéiformes (7, 8) comportant deux surfaces cunéiformes (7a, 8a) déplaçables l'une par rapport à l'autre et correspondant chacune l'une à l'autre. Les surfaces cunéiformes (7a, 8a) correspondent l'une à l'autre, de sorte qu'un déplacement d'un des éléments cunéiformes (7, 8) induit une sollicitation radiale de la crémaillère (2) dans une direction de sollicitation axiale.
PCT/EP2018/065249 2017-08-11 2018-06-11 Dispositif d'application d'une crémaillère WO2019029865A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017214017.8A DE102017214017A1 (de) 2017-08-11 2017-08-11 Vorrichtung zum Andrücken einer Zahnstange
DE102017214017.8 2017-08-11

Publications (1)

Publication Number Publication Date
WO2019029865A1 true WO2019029865A1 (fr) 2019-02-14

Family

ID=62597502

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/065249 WO2019029865A1 (fr) 2017-08-11 2018-06-11 Dispositif d'application d'une crémaillère

Country Status (2)

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DE (1) DE102017214017A1 (fr)
WO (1) WO2019029865A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113895890A (zh) * 2021-10-29 2022-01-07 宝武集团鄂城钢铁有限公司 一种拨车机齿轮间隙调整方法
CN114060485A (zh) * 2021-11-08 2022-02-18 中汽创智科技有限公司 一种间隙调节装置及齿轮齿条转向器
FR3123880A1 (fr) * 2021-06-14 2022-12-16 Jtekt Europe Palier de guidage d’une crémaillère d’un système de direction

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005070745A1 (fr) * 2004-01-26 2005-08-04 Schmitterchassis Gmbh Palier reglable par clavette pour mecanisme de direction de vehicule automobile
DE102005005400A1 (de) 2005-02-05 2006-08-10 Zf Lenksysteme Gmbh Vorrichtung zum Andrücken einer Zahnstange an ein mit der Zahnstange in Eingriff stehendes Ritzel
EP1787890A1 (fr) * 2005-11-21 2007-05-23 TRW ITALIA S.p.A. Ensemble de direction
DE102009007351A1 (de) * 2008-02-06 2009-10-08 Jtekt Europe Andruckleitung für eine Kraftfahrzeugzahnstangenlenkung
DE102008054782A1 (de) 2008-12-17 2010-07-01 Zf Lenksysteme Gmbh Vorrichtung zum Andrücken einer Zahnstange
JP2012245810A (ja) * 2011-05-25 2012-12-13 Jtekt Corp ラック軸支持装置および車両用操舵装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005070745A1 (fr) * 2004-01-26 2005-08-04 Schmitterchassis Gmbh Palier reglable par clavette pour mecanisme de direction de vehicule automobile
DE102005005400A1 (de) 2005-02-05 2006-08-10 Zf Lenksysteme Gmbh Vorrichtung zum Andrücken einer Zahnstange an ein mit der Zahnstange in Eingriff stehendes Ritzel
EP1787890A1 (fr) * 2005-11-21 2007-05-23 TRW ITALIA S.p.A. Ensemble de direction
DE102009007351A1 (de) * 2008-02-06 2009-10-08 Jtekt Europe Andruckleitung für eine Kraftfahrzeugzahnstangenlenkung
DE102008054782A1 (de) 2008-12-17 2010-07-01 Zf Lenksysteme Gmbh Vorrichtung zum Andrücken einer Zahnstange
JP2012245810A (ja) * 2011-05-25 2012-12-13 Jtekt Corp ラック軸支持装置および車両用操舵装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3123880A1 (fr) * 2021-06-14 2022-12-16 Jtekt Europe Palier de guidage d’une crémaillère d’un système de direction
US11952051B2 (en) 2021-06-14 2024-04-09 Jtekt Europe Guide bearing of a rack of a steering system
CN113895890A (zh) * 2021-10-29 2022-01-07 宝武集团鄂城钢铁有限公司 一种拨车机齿轮间隙调整方法
CN114060485A (zh) * 2021-11-08 2022-02-18 中汽创智科技有限公司 一种间隙调节装置及齿轮齿条转向器

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