WO2021224100A1 - Pièce de pression pour direction à crémaillère - Google Patents

Pièce de pression pour direction à crémaillère Download PDF

Info

Publication number
WO2021224100A1
WO2021224100A1 PCT/EP2021/061248 EP2021061248W WO2021224100A1 WO 2021224100 A1 WO2021224100 A1 WO 2021224100A1 EP 2021061248 W EP2021061248 W EP 2021061248W WO 2021224100 A1 WO2021224100 A1 WO 2021224100A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure piece
rack
spring
pinion
spring washer
Prior art date
Application number
PCT/EP2021/061248
Other languages
German (de)
English (en)
Inventor
Peter Brenner
Adrian Franz KORNACKER
Andreas Tschuertz
Christof KECKEISEN
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 WO2021224100A1 publication Critical patent/WO2021224100A1/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
    • F16H55/28—Special devices for taking up backlash
    • F16H55/283—Special devices for taking up backlash using pressure yokes

Definitions

  • the invention relates to a pressure piece for a rack and pinion steering, a device for pressing a rack against a pinion and a rack and pinion steering.
  • a steering torque applied by a driver and / or a support device is transmitted via at least one pinion to the rack running essentially transversely to the pinion, which is usually mounted in a steering housing.
  • the rotary movement of the steering wheel and / or the support device is translated into a translational movement.
  • the toothed pinion meshes with a toothed section of the rack.
  • a defined play, regularly no noticeable play, must be maintained very precisely between the pinion and the rack in order to achieve a smooth movement of the rack and to prevent noise emissions.
  • the pressure piece that holds the rack in engagement with the pinion is used for this purpose. Errors regarding the eccentricity of the pinion, its axial play and wear on the teeth should be taken into account.
  • the mechanism should be able to withstand impacts from the steered wheels without damage.
  • the pressure piece can be elastically sprung and is usually loaded with a spring in order to compensate for the height tolerances in the toothing of the pinion and rack due to the manufacture.
  • the pressure piece consequently serves to transfer a steering angle introduced by the driver to the rack and thus the steering stroke without play.
  • the task of the pressure piece is to push the rack into the pinion with a defined force over a defined working or stroke range in order to e.g. B. to compensate for tolerances from manufacturing and wear during the service life. This is achieved, for example, in that the pressure piece is pressed in the direction of the rack via a spring, this spring being supported on an adjusting screw to which the spring is attached.
  • the specified working area can be set using the adjusting screw when it is new during assembly.
  • a device for pressing a toothed rack onto a pinion is known from the document EP 1 807 639 B1, the device comprising a pressure piece and an adjusting device.
  • the pressure piece has a pressure piece body and a pin protruding in the direction of the actuating device, the exposed end of which is designed as a contact surface.
  • the adjusting device is in turn formed in at least two parts from an adjusting screw and a spring, the spring being arranged between the adjusting screw and the pressure piece and forming the contact surface for the exposed end of the pin.
  • the spring is designed as a flat spring washer, which is compressed in the basic position by the pin.
  • the presented pressure piece is intended for a device for pressing a rack onto a pinion.
  • This device includes, inter alia, the pressure piece and an adjusting device, which in turn can include an adjusting screw.
  • the device in turn is intended for use in a rack and pinion steering system.
  • the pressure piece is set up with the Acting device cooperate.
  • a spring is attached to the pressure piece and is arranged at least in sections between the pressure piece and the actuating device. This spring is also a component of the device mentioned.
  • the spring is designed, for example, as a spring washer. However, other spring shapes and types are also conceivable. It is important that the spring is attached or fixed to the pressure piece.
  • the spring is attached in the area of a dome which is formed on a side of the pressure piece facing the actuating device. This dome thus extends in the direction of the adjusting device or the adjusting screw of the adjusting device.
  • the dome can have an outwardly curved surface on a side facing the actuating device.
  • This curved or convex surface represents a convex surface.
  • the spring for example the spring washer, has a first, typically central hole through which a pin is passed at one end in order to fix the spring on the pressure piece.
  • the spring or the spring washer can thus be held in its radial position.
  • the other end of the pin can be integrally formed on the pressure piece, for example on the dome.
  • the other end of the pin can also be pressed into a second hole which is formed in the pressure piece, for example in the dome.
  • the pin is deformed in the area of its one end in such a way that there is an enlarged cross section. The pin can then no longer be passed through the hole in the spring washer, so that the entire arrangement is prevented from falling apart.
  • the device presented is used to press a rack against a pinion in a rack and pinion steering system.
  • the device comprises a Adjusting device, for example an adjusting screw, and a pressure piece of the type described here.
  • the rack and pinion steering system described for a motor vehicle has a rack and pinion, these components interacting via a device for pressing a rack against a pinion of the type described.
  • the thrust piece presented is based on the idea of preventing the relative movement between the thrust piece and the actuating device and the resulting clicking noises, without the need for additional measures during assembly or additional processes for the assembly of the steering or the manufacture of parts.
  • Figure 1 shows a schematic representation of a first embodiment of a rack and pinion steering.
  • Figure 2 shows a schematic representation of a second embodiment of a rack and pinion steering.
  • Figure 3 shows a device for pressing a rack according to the prior art.
  • Figure 4 shows an embodiment of the presented device for pressing a pressure piece.
  • FIG. 1 shows an embodiment of a rack and pinion steering system, which is designated as a whole by the reference number 10.
  • a first arrow 12 points in the direction of the sensor side
  • a second arrow 14 points in the direction of the motor side.
  • the illustration shows a rack 20, a pressure piece 22, in this case in particular the pressure piece body, a sliding film 24, a sensor unit 26, a compression spring 28, an adjusting screw 30 and a motor 32.
  • FIG. 2 shows a further embodiment of a rack and pinion steering system, which is designated with the reference number 50 in particular.
  • a first arrow 52 points in the direction of the sensor side, a second arrow 54 points in the direction of the motor side.
  • the illustration shows a rack 60, an O-ring 62, a plate spring 64, which is additionally installed here, and a motor 66.
  • the plate spring 64 generally fulfills the same function as a compression spring, with the difference that a significantly higher axial force can be set in the given installation space.
  • FIG. 3 shows a device 100 for pressing a toothed rack according to the prior art in two states, namely on the left side in the unloaded state and on the right side in the loaded state.
  • the device 100 comprises a pressure piece 102, an adjusting device 104 with an adjusting screw 106 and a spring washer 108 which is inserted into the adjusting screw 106 and fixed to it.
  • An arrow 110 illustrates the evasive force caused by a movement of the rack.
  • the pressure piece 102 is adapted to the shape of the rack back on a side aligned with the rack and has a sliding surface 120 which ensures low-friction and low-wear pushing of the rack into the pinion.
  • the pressure piece 102 is pressed onto the back of the rack via a spring, in this case the spring washer 108, which is built into the adjusting screw 106.
  • the required working range 122 of the spring in this case the spring washer 108, can be adjusted with the adjusting screw 106 during assembly.
  • the design of the spring washer 108 and the working area 122 are specified via the desired level of friction from the rack to the pressure piece 102 and the parameters tolerances and wear over the service life. At the end of the specified service life, the working area 122 should still be present in such a way that no play and therefore no noises occur.
  • the spring washer 108 between the pressure piece 102 and the adjusting screw 106 can also be implemented as a spiral spring. The resilience via the spring washer 108 is described below.
  • This caulking process on the outer ring of the adjusting screw 106 leads to two disadvantages: Due to the required compact design, the area for caulking the outer ring on the adjusting screw 106 is limited and thus also the holding force that can be achieved. In the event of additional dimensional and process fluctuations, this can lead to the spring washer falling out of the Retaining ring 132 and, as a result, lead to incorrect assembly and the resulting reworking or to malfunctions in operation.
  • FIG. 4 in which a device 200 for pressing a toothed rack is shown in two states, namely on the left side in the unloaded state and in the middle and on the right side in the loaded state.
  • the device 200 comprises a pressure piece 202 and an adjusting device 204 with an adjusting screw 206.
  • a spring washer 208 which serves as a spring, is also provided. In this case, this is on the pressure piece 202 attached or fixed.
  • An arrow 210 illustrates the evasive force caused by a movement of the rack.
  • the pressure piece 202 is adapted to the shape of the rack back on a side facing the rack and is equipped with a sliding surface 220 which ensures that the rack is pressed into the pinion with little friction and wear.
  • the pressure piece 202 is pressed onto the back of the rack via a spring, in this case the spring washer 208, which is attached to the pressure piece 202.
  • the required working range (see FIG. 1) of the spring, in this case the spring washer 208 can be adjusted with the adjusting screw 206 during assembly.
  • the design of the spring washer 208 and the working range are specified via the desired level of friction from the rack to the pressure piece 202 and the parameters tolerances and wear over the service life. At the end of the specified service life, the working area should still be available in such a way that there is no play and therefore no noise.
  • the spring washer 208 can be attached to the pressure piece 202, for example, through a central hole in the spring washer 208, through which a pin 240, which is located centrally on a dome 242 of the pressure piece, is guided.
  • a pin 240 which is located centrally on a dome 242 of the pressure piece.
  • the spring washer 208 is pushed onto the pin 240.
  • the spring washer 208 can be prevented from falling off the pin 240 by a subsequent deformation of the pin 240, for example in the form of a rivet head. Care must be taken that the deformation of the pin end towards the rivet head leaves enough play between the rivet head and spring washer 208 so that the spring washer 208 has sufficient free space in the working area.
  • the central fixation of the spring washer 208 by the pressure piece now allows a large play 244 between the spring washer 208 and a retaining or support ring 246 of the adjusting screw 206 or even the complete omission of the support ring 246.
  • the spring washer 208 can be fixed on the dome 242 of the pressure piece 202 by an additional component in the form of a rivet which is pressed through the central hole in the spring washer 208 into a hole on the pressure piece dome 242.
  • a further optimization that prevents the spring washer 208 from rubbing against the pin 240 or retaining pin can be achieved by an outwardly curved or spherical shape 250 of the dome 242 or pressure piece dome, as shown in FIG. 4 on the right-hand side be. This curvature extends in the direction of the adjusting screw 206 or the adjusting device 204. When pressure is applied to the spring washer 208 and the resulting spherical shape, it rests on the pressure piece dome 242 and there is no relative movement between the spring washer 208 and the pin 240.

Landscapes

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

Abstract

L'invention concerne une pièce de pression pour un appareil (200) qui permet de presser une crémaillère sur un pignon, l'appareil (200) pouvant être introduit dans une direction à crémaillère, ladite pièce de pression (202) étant conçue pour interagir avec un dispositif de réglage (204), et un ressort étant fixé à la pièce de pression (202) et étant disposé au moins en partie entre la pièce de pression (202) et le dispositif de réglage (204).
PCT/EP2021/061248 2020-05-08 2021-04-29 Pièce de pression pour direction à crémaillère WO2021224100A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020205799.0A DE102020205799A1 (de) 2020-05-08 2020-05-08 Druckstück für Zahnstangenlenkung
DE102020205799.0 2020-05-08

Publications (1)

Publication Number Publication Date
WO2021224100A1 true WO2021224100A1 (fr) 2021-11-11

Family

ID=75801567

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/061248 WO2021224100A1 (fr) 2020-05-08 2021-04-29 Pièce de pression pour direction à crémaillère

Country Status (2)

Country Link
DE (1) DE102020205799A1 (fr)
WO (1) WO2021224100A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0858607A (ja) * 1994-08-26 1996-03-05 Toyota Motor Corp ラックアンドピニオン式のステアリング装置
EP1807639B1 (fr) 2004-11-05 2008-04-02 ZF-Lenksysteme GmbH Dispositif pour comprimer une cremaillere
DE102008043116A1 (de) * 2008-10-23 2010-04-29 Zf Lenksysteme Gmbh Vorrichtung zum Andrücken einer Zahnstange an ein Ritzel
KR20130008964A (ko) * 2011-07-14 2013-01-23 주식회사 만도 자동차 조향장치의 랙바 지지장치 및 이를 구비한 자동차 조향장치
KR20130053180A (ko) * 2011-11-15 2013-05-23 주식회사 만도 자동차 조향장치의 랙바 지지장치
KR20150047984A (ko) * 2013-10-25 2015-05-06 현대모비스 주식회사 전동식 파워 스티어링의 래틀 방지장치

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0858607A (ja) * 1994-08-26 1996-03-05 Toyota Motor Corp ラックアンドピニオン式のステアリング装置
EP1807639B1 (fr) 2004-11-05 2008-04-02 ZF-Lenksysteme GmbH Dispositif pour comprimer une cremaillere
DE102008043116A1 (de) * 2008-10-23 2010-04-29 Zf Lenksysteme Gmbh Vorrichtung zum Andrücken einer Zahnstange an ein Ritzel
KR20130008964A (ko) * 2011-07-14 2013-01-23 주식회사 만도 자동차 조향장치의 랙바 지지장치 및 이를 구비한 자동차 조향장치
KR20130053180A (ko) * 2011-11-15 2013-05-23 주식회사 만도 자동차 조향장치의 랙바 지지장치
KR20150047984A (ko) * 2013-10-25 2015-05-06 현대모비스 주식회사 전동식 파워 스티어링의 래틀 방지장치

Also Published As

Publication number Publication date
DE102020205799A1 (de) 2021-11-11

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