WO2015124466A1 - Direction à crémaillère et ensemble d'amortissement de butée de fin de course pour ladite direction à crémaillère - Google Patents

Direction à crémaillère et ensemble d'amortissement de butée de fin de course pour ladite direction à crémaillère Download PDF

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Publication number
WO2015124466A1
WO2015124466A1 PCT/EP2015/052775 EP2015052775W WO2015124466A1 WO 2015124466 A1 WO2015124466 A1 WO 2015124466A1 EP 2015052775 W EP2015052775 W EP 2015052775W WO 2015124466 A1 WO2015124466 A1 WO 2015124466A1
Authority
WO
WIPO (PCT)
Prior art keywords
rack
ring
pinion steering
damping assembly
end stop
Prior art date
Application number
PCT/EP2015/052775
Other languages
German (de)
English (en)
Inventor
Eduard Span
Robert Kolloch
Original Assignee
Trw Automotive 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 Trw Automotive Gmbh filed Critical Trw Automotive Gmbh
Publication of WO2015124466A1 publication Critical patent/WO2015124466A1/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

Definitions

  • the invention relates to a rack and pinion steering for motor vehicles, with a rack having a longitudinal axis, a rack housing in which the rack is axially displaceably guided between two end stops, and at least one received in the rack housing Endanschlag- damping assembly, which is fixed in the axial direction on the rack housing ,
  • the end stop damping assembly comprises at least one stop ring and at least one elastic compression body and can be mounted with little effort in the rack housing of the rack and pinion steering.
  • the object of the invention is to provide a rack and pinion steering with an end stop damping assembly, which is subject during operation of the rack and pinion steering a particularly low wear and must be replaced accordingly rare.
  • this object is achieved by a rack and pinion steering of the type mentioned, in which the end stop damping assembly is rotatably supported in the rack housing in the circumferential direction.
  • a steering torque applied by the driver is forwarded in rack-and-pinion steering via a pinion and a meshing with the pinion gear teeth of the rack to steerable wheels of the motor vehicle, the toothing of the rack is in particular a helical toothing.
  • the end stop damping assembly has a stop ring, which comes in an axial Endanschlag too the rack and pinion steering frontally with the rack or a firmly connected to the rack member in contact.
  • a stop ring provides a substantially uniform load distribution within the end stop damping assembly
  • the stop ring is preferably a metal ring, in particular a steel ring. Such a stable and robust design of the stop ring contributes to a particularly low wear of the end stop damping assembly.
  • the end stop damping assembly preferably has a compression body which is made of an elastomer and vulcanized directly to the stop ring.
  • a compression body which is made of an elastomer and vulcanized directly to the stop ring.
  • This compression body in particular an axial dimension of the compression body, can be set with little effort, a maximum steering angle of the motor vehicle and adjust, for example, to a predetermined rim width.
  • the end stop damping assembly in another embodiment of the rack and pinion steering, has a mounting ring for mounting the end stop damping assembly in the rack housing.
  • the fastening ring can be designed in particular as an auxiliary support which limits a bending of the rack. This additional support of the rack under extreme loads offers the advantage that smaller diameter racks can be used, reducing both the weight and the costs of rack-and-pinion steering.
  • auxiliary support tensions due to statically overdetermined storage play no role, because the rack remains largely static stored.
  • the auxiliary support is in fact not a permanent bearing, but offers only in the case of extreme bending stress a temporary support.
  • the storage of the rack is statically overdetermined only during the short-term extreme load.
  • the auxiliary support allows the use of smaller toothed modules (and thus a lower tooth height). This increases the cross-section of the rack and provides benefits in terms of gearing design.
  • the attachment ring is preferably a plastic ring which forms a latching connection with the rack housing.
  • Made of plastic mounting rings are inexpensive to produce and allow the locking connection a simple and reliable attachment of the Endanschlag-Dämpfungsbau- group on the rack housing.
  • latching segments distributed over the circumference of the ring are provided on a radial outer side of the fastening ring, which project radially outwards.
  • the fastening ring preferably has segment-shaped recesses which are arranged radially inwardly of the latching segments. These recesses allow or facilitate a radial deformability of the fastening ring in the region of the locking segments. In this way, the mounting ring can be easier to insert into the rack housing and move in the rack housing.
  • each locking segment is associated with exactly one segment-shaped recess.
  • the rack housing preferably has a cylindrical opening for receiving the rack, wherein in the opening a circumferential groove is formed, in which extend the locking segments of the mounting ring.
  • the end stop damping assembly can be fixed with little effort in the axial direction on the rack housing and stored in the circumferential direction rotatably in the rack housing.
  • the end-stop cushion assembly has a compression body made of an elastomer and vulcanized directly to the mounting ring or glued to the mounting ring. This embodiment has the advantage that the production of the compression body and its connection with the mounting ring can be done in one step and thus the manufacturing cost of the end stop damping assembly is particularly low.
  • the end stop damping assembly on a compression body which is made of an elastomer and locked to the mounting ring, wherein the compression body at least one flexible latching portion is formed.
  • the flexible latching section on the compression body is in particular a circumferential latching lug on an end face of the compression body facing the fastening ring.
  • the end stop damping assembly preferably includes a stop ring, a mounting ring for mounting the end stop damping assembly in the rack housing, and an axially disposed between the stop ring and the mounting ring compression body.
  • the compression body is in particular annular and arranged exactly like the stop ring and the mounting ring concentric with the longitudinal axis.
  • an inner diameter of the fastening ring is preferably smaller than an inner diameter of the stop ring and also smaller than an inner diameter of the annular compression body.
  • the fastening ring can form an advantageous auxiliary support under extreme bending stress and resulting deformation of the rack. which limits a bend of the rack.
  • the stop ring and the compression body do not come because of the larger inner diameter with the rack in contact.
  • the invention also includes a Endantsch-Dämpfungsbau- group for the above rack and pinion steering, with a mounting ring having on its radially outer side over the ring circumference distributed locking segments which project radially outward and for fastening the end stop damping assembly in a groove of the Rack housing can intervene.
  • a limit stop damping assembly can be mounted with little effort in the rack housing and has a very long service life.
  • FIG. 1 shows a schematic sketch of a rack and pinion steering system according to the invention
  • FIG. 2 shows a range "A" of the rack and pinion steering according to Figure 1 in detail section;
  • FIG. 3 is an exploded perspective view of an end stop damping assembly according to the invention for the rack and pinion steering according to Figure 2;
  • FIG. 4 shows a perspective view of the assembled end stop damping assembly according to FIG. 3 for mounting in a rack housing of the rack and pinion steering according to FIG. 2;
  • FIG. 5 is a sectional detail of the assembled end stop damping assembly of FIG. 4 according to one embodiment.
  • FIG. 6 is a sectional detail of the assembled end stop damping assembly of FIG. 4 according to an alternative embodiment.
  • FIG. 1 shows a rack-and-pinion steering system 10 for motor vehicles.
  • the rack and pinion steering 10 is part of an electro-hydraulic vehicle steering system in which a steering wheel 12 is connected via a steering column 14 is connected to a servo valve 16 and a pinion 18.
  • the pinion 18 meshes with a rack 20 so that it is acted upon by a force applied to the steering wheel 12, manual steering force.
  • a hydraulic actuating cylinder 22 is provided which can act on the rack 20 in a known manner with a hydraulic power steering assist.
  • the steering assist force can also be applied differently, for example by means of an electric motor.
  • the rack 20 is coupled via tie rods 24 with steerable wheels 26 of a motor vehicle, wherein the rack 20 is connected by a respective ball joint 28 with the tie rods 24.
  • An end stop for the toothed rack 20 is formed on a rack housing 30 in a connection area "A" between the toothed rack 20 and the tie rod 24.
  • a maximum steering angle is defined by the end stop When steering up to the end stop, high mechanical stresses occur in the rack and pinion steering 10 In order to avoid damage to the steering, it is therefore customary to provide damping in the region of the limit stop.
  • FIG. 2 shows in section the region "A" of Figure 1.
  • the rack and pinion steering 10 comprises according to Figure 2, the rack 20, which has a longitudinal axis X, the rack housing 30, in the the rack 20 is axially slidably guided between two end stops, and at least one received in the rack housing 30 end stop damping assembly 32 which is fixed in the axial direction on the rack housing 30.
  • FIG. 3 shows an exploded perspective view of the end stop damping assembly 32 with a stop ring 34, a mounting ring 36 for mounting the end stop damping assembly 32 in the rack and pinion housing 30 and an axially disposed between the stop ring 34 and the mounting ring 36 compression body 38th
  • the mounting ring 36 is a plastic ring, which forms a latching connection with the rack housing 30.
  • locking segments 42 distributed over the circumference of the ring are provided on a radial outer side 40 of the fastening ring 36, which project radially outward.
  • the rack housing 30 has according to Figure 2 a cylindrical opening 44 for receiving the rack 20, wherein in the opening 44, a circumferential groove 46 is formed, in which the locking segments 42 of the mounting ring 36 engage.
  • FIG 4 shows the rack housing 30 of the rack and pinion steering 10 and the assembled in the rack housing 30, composite end stop damping assembly 32 shown in FIG 3.
  • the circumferential groove 46 is indicated, in which the radially outwardly projecting locking segments 42 of the mounting ring 36 for securing the end stop damping assembly 32 can engage.
  • fastening ring 36 In order for the fastening ring 36 to be axially insertable into the cylindrical opening 44 of the rack housing 30 during assembly of the end stop damping assembly 32 according to FIG. 4, it must have a certain elastic deformability in the radial direction at least in the region of the latching segments 42.
  • the fastening ring 36 has segment-shaped recesses 48, which are arranged radially inward of the latching segments 42.
  • each locking segment 42 can be associated with exactly one segment-shaped recess 48.
  • the recesses 48 allow elastic deformation of the mounting ring 36 in the region of the locking segments 42 radially inwardly, so that the end stop damping assembly 32 can be inserted into the cylindrical opening 44.
  • a push-in force to be applied for mounting the end stop damping assembly 32 can be adjusted via the size and geometry of the cutouts 48. Does the end stop damping assembly 32 reach its mounting position?
  • the end stop damping assembly 32 is fixed in a simple manner in the axial direction of the rack housing 30. In the circumferential direction, the end stop damping assembly 32, however, rotatably mounted in the rack housing 30, since the groove 46 rotates in the circumferential direction.
  • the end stop damping assembly 32 can rotate relative to the rack housing 30, which in particular significantly reduces the torsional stress of the compression body 38 and its concomitant wear.
  • FIG. 5 shows an embodiment of the end stop damping assembly 32, in which the compression body 38 is made of an elastomer and locked to the mounting ring 36, wherein the compression body 38 at least one flexible locking portion 50 is formed.
  • the latching portion 50 is formed according to Figure 5 as a circumferential latching lug on the mounting ring 36 facing the end face of the compression body 38 and engages in a circumferential groove 52 of the mounting ring 36 a.
  • the Endanschlag- damping assembly 32 may also be a relative rotation between the mounting ring 36 and the compression body 38 at a torsional load by the rack 20 possible.
  • Figure 6 shows the end stop damping assembly 32 according to an alternative embodiment, in which the compression body 38 is made of an elastomer and vulcanized directly to the mounting ring 36 or bonded to the mounting ring 36.
  • This embodiment has the advantage that the production cost for the fastening ring 36 and the compression body 38 in comparison to the embodiment of Figure 5 is significantly lower.
  • the limit stop Damper assembly 32 according to Figure 5 and no relative rotation between the mounting ring 36 and the compression body 38 is possible.
  • the stop ring 34 of the end stop damping assembly 32 comes in an axial Endanschlag too the rack and pinion steering 10 according to Figure 2 frontally with the rack 20 or a fixed to the rack 20 connected to component 54 in contact and is particularly intended for load distribution and protection of the compression body 38.
  • the stop ring 34 is therefore preferably a stable metal ring, in particular a steel ring.
  • the compression body 38 is made of an elastomer and vulcanized directly to the stop ring 34 according to the present embodiments. This has the advantage that the production of the compression body 38 and the attachment of the compression body 38 can be made on the stop ring 34 in a single step.
  • the compression body 38 is annular and, just like the stop ring 34 and the mounting ring 36 is arranged concentrically to the longitudinal axis X (see Figure 2).
  • An inner diameter r 36 of the mounting ring 36 is smaller than an inner diameter r 34 of the stop ring 34 and smaller than an inner diameter r 38 of the annular compression body 38.
  • the mounting ring 36 has the smallest radial distance from the rack 20 and is preferably designed as an auxiliary support , which limits a bending of the rack 20. It should be emphasized that the executed as an auxiliary support mounting ring 36 is not applied to the rack 20 with unloaded rack 20, but circumferentially has a clearance of at least 0.2 mm. By this circumferential, radial gap, the auxiliary support is no additional permanent storage or leadership, so that the rack 20 is further stored statically determined. In the event that a deflection of the rack 20 in the auxiliary support exceeds this gap, the rack 20 comes into contact with the auxiliary support, which then largely prevents further bending of the rack 20.

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

Abstract

L'invention concerne une direction à crémaillère (10) d'un véhicule automobile, comprenant une crémaillère (20) ,qui présente un axe longitudinal (X), un carter de crémaillère (30), dans lequel la crémaillère (20) est guidée de manière mobile par un coulissement axial entre deux butées de fin de course, ainsi qu'au moins un ensemble (32) d'amortissement de butée de fin de course logé dans le carter de crémaillère (30), l'ensemble d'amortissement de butée de fin de course (32) étant monté de manière à pouvoir tourner en direction circonférentielle dans le carter de crémaillère (30). L'invention concerne par ailleurs un ensemble d'amortissement de butée de fin de course (32) destiné à une direction à crémaillère (10) de ce type.
PCT/EP2015/052775 2014-02-24 2015-02-10 Direction à crémaillère et ensemble d'amortissement de butée de fin de course pour ladite direction à crémaillère WO2015124466A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014102375.7A DE102014102375A1 (de) 2014-02-24 2014-02-24 Zahnstangenlenkung sowie Endanschlag-Dämpfungsbaugruppe für eine solche Zahnstangenlenkung
DE102014102375.7 2014-02-24

Publications (1)

Publication Number Publication Date
WO2015124466A1 true WO2015124466A1 (fr) 2015-08-27

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PCT/EP2015/052775 WO2015124466A1 (fr) 2014-02-24 2015-02-10 Direction à crémaillère et ensemble d'amortissement de butée de fin de course pour ladite direction à crémaillère

Country Status (2)

Country Link
DE (1) DE102014102375A1 (fr)
WO (1) WO2015124466A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3219577A3 (fr) * 2016-03-15 2017-09-27 Jtekt Corporation Appareil d'amortisseur et système de direction
CN112896290A (zh) * 2019-11-19 2021-06-04 Zf汽车德国有限公司 齿条齿轮机构、转向机构及转向***
CN113195338A (zh) * 2018-12-28 2021-07-30 大众汽车股份公司 机电的机动车转向***
CN112896290B (zh) * 2019-11-19 2024-07-05 Zf汽车德国有限公司 转向机构及转向***

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7217159B2 (ja) * 2019-01-28 2023-02-02 日立Astemo株式会社 ステアリング装置、及びステアリング装置の製造方法
DE102019133406A1 (de) * 2019-12-06 2021-06-10 Zf Automotive Germany Gmbh Schubstangenführungsbaugruppe, Lenkaktuator sowie Verfahren zur Herstellung einer Schubstangenführungsbaugruppe

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005123484A1 (fr) * 2004-06-21 2005-12-29 Nsk Ltd. Dispositif amortisseur à la fin de course d'une crémallère
EP1777138A1 (fr) * 2005-10-24 2007-04-25 ZF Lenksysteme GmbH Dispositif de direction pour un véhicule automotrice
DE102008000213A1 (de) * 2008-02-01 2009-08-06 Zf Lenksysteme Gmbh Elektrische Servolenkung
DE102009019890A1 (de) * 2009-05-04 2010-11-11 Trw Automotive Gmbh Zahnstangenlenkung
DE102011051715A1 (de) * 2011-07-11 2013-01-17 Zf Lenksysteme Gmbh Zahnstangenlenkgetriebe
DE102012101147A1 (de) * 2012-02-14 2013-08-14 Tedrive Steering Systems Gmbh Stützlager mit Federelement

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070262530A1 (en) * 2006-05-11 2007-11-15 Mando Corporation Sealing part structure of hydraulic power steering apparatus
DE102011014922A1 (de) * 2011-03-24 2012-09-27 Volkswagen Aktiengesellschaft Elektromechanische Lenkung für ein Fahrzeug und elastischer Endanschlag dazu

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005123484A1 (fr) * 2004-06-21 2005-12-29 Nsk Ltd. Dispositif amortisseur à la fin de course d'une crémallère
EP1777138A1 (fr) * 2005-10-24 2007-04-25 ZF Lenksysteme GmbH Dispositif de direction pour un véhicule automotrice
DE102008000213A1 (de) * 2008-02-01 2009-08-06 Zf Lenksysteme Gmbh Elektrische Servolenkung
DE102009019890A1 (de) * 2009-05-04 2010-11-11 Trw Automotive Gmbh Zahnstangenlenkung
DE102011051715A1 (de) * 2011-07-11 2013-01-17 Zf Lenksysteme Gmbh Zahnstangenlenkgetriebe
DE102012101147A1 (de) * 2012-02-14 2013-08-14 Tedrive Steering Systems Gmbh Stützlager mit Federelement

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3219577A3 (fr) * 2016-03-15 2017-09-27 Jtekt Corporation Appareil d'amortisseur et système de direction
US10118640B2 (en) 2016-03-15 2018-11-06 Jtekt Corporation Damper apparatus and steering system
CN113195338A (zh) * 2018-12-28 2021-07-30 大众汽车股份公司 机电的机动车转向***
CN112896290A (zh) * 2019-11-19 2021-06-04 Zf汽车德国有限公司 齿条齿轮机构、转向机构及转向***
US11731685B2 (en) * 2019-11-19 2023-08-22 Zf Automotive Germany Gmbh Steering gear of a vehicle steering system
CN112896290B (zh) * 2019-11-19 2024-07-05 Zf汽车德国有限公司 转向机构及转向***

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