WO2017009252A1 - Système de direction de véhicule - Google Patents

Système de direction de véhicule Download PDF

Info

Publication number
WO2017009252A1
WO2017009252A1 PCT/EP2016/066339 EP2016066339W WO2017009252A1 WO 2017009252 A1 WO2017009252 A1 WO 2017009252A1 EP 2016066339 W EP2016066339 W EP 2016066339W WO 2017009252 A1 WO2017009252 A1 WO 2017009252A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor shaft
steering system
toothing
vehicle steering
hub
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.)
Ceased
Application number
PCT/EP2016/066339
Other languages
German (de)
English (en)
Inventor
Eduard Span
Robert Kolloch
Rico ANDERSCH
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.)
ZF Automotive Germany GmbH
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 WO2017009252A1 publication Critical patent/WO2017009252A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • F16H55/17—Toothed wheels
    • F16H55/171—Toothed belt pulleys
    • 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
    • B62D5/0421—Electric motor acting on or near steering gear
    • B62D5/0424—Electric motor acting on or near steering gear the axes of motor and final driven element of steering gear, e.g. rack, being parallel
    • 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
    • F16H57/00—General details of gearing
    • F16H57/0018—Shaft assemblies for gearings
    • F16H57/0025—Shaft assemblies for gearings with gearing elements rigidly connected to a shaft, e.g. securing gears or pulleys by specially adapted splines, keys or methods
    • 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
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H2025/2062—Arrangements for driving the actuator
    • F16H2025/2096—Arrangements for driving the actuator using endless flexible members

Definitions

  • the invention relates to a vehicle steering system with a belt transmission having a motor shaft and a seated on the motor shaft pulley with a hub.
  • Such belt transmissions in particular toothed belt transmissions, are now widely used to initiate a steering assist force in electromechanical power steering systems.
  • pulley pulley such a gear assembly for power steering drives
  • pulley pulley a pot-shaped or bell-shaped body having a arranged on the outer circumference toothing and at least one separate flanged wheel, wherein the toothing of the body on both end faces with each flanged wheel is completed.
  • the object of the invention is to provide a belt transmission for a vehicle steering system, which is structurally simple, allows a simple and reliable installation of the motor shaft with the pulley and is inexpensive and has a low mass.
  • a vehicle steering system is provided with a belt transmission having a motor shaft and a seated on the motor shaft pulley with a hub, wherein the pulley is in one piece and consists of plastic.
  • the one-piece construction without metal insert and / or without undercuts of the pulley allows easy production.
  • plastic such as PET GF50 Arnite AV2 390XT
  • the material for the pulley not only the cost but also the mass of the pulley are significantly reduced. This has not only a much lower weight but also the advantage that the inertia of Pulley is greatly reduced and so a higher acceleration, for example, at engine start is possible.
  • the hub in the axial direction at least two, preferably at least three sections with different inner diameter, the surface texture can also be designed differently. This design proves to be beneficial in assembling the motor shaft with the pulley.
  • the motor shaft at the end connected to the pulley on a portion with a toothing, in particular a straight toothing, which is in engagement with a counter toothing on the hub.
  • a simple connection of the motor shaft with the pulley is possible.
  • the tip diameter of the toothing may be smaller than or equal to the outside diameter of the motor shaft. In this way, the teeth do not protrude beyond the lateral surface of the motor shaft and is less expensive to produce.
  • the tip diameter of the counter teeth may be smaller than the inner diameter of the hub.
  • the teeth of the motor shaft on the counter-toothing of the hub is easier to align during assembly.
  • the hub has the counter teeth in a first section, which may be in particular a straight toothing, wherein a play-free fit of the teeth of the pulley and motor shaft is present. In this way, a good connection and power transmission are ensured.
  • the toothing is preferably a knurling, in particular a Geradrändelung, according to DIN 82. This allows the teeth to realize low on the motor shaft and the axial configuration of the teeth easier assembly without stresses on the teeth is possible.
  • the hub has a first and a second portion, wherein the inner diameter of the second portion maximum corresponds to the outer diameter of the motor shaft at an adjacent portion and in particular wherein the hub is seated on the second portion with a press fit on the motor shaft.
  • the hub comprises a third section whose inner diameter corresponds at least to the outer diameter of the motor shaft.
  • the second portion is located between the first and the third portion and thus allows the resistance-free adjustment of motor shaft and pulley to each other.
  • the second section is preferably axially as long as the portion of the motor shaft with the toothing. As a result, the teeth already engage one another when the section without teeth of the motor shaft comes into contact with the second section of the pulley.
  • the pulley on its lateral surface on a helical toothing which is particularly quiet and quiet.
  • FIG. 1 shows a schematic section of a vehicle steering system according to the invention
  • FIG. 2 shows a sectional view of one half of the belt pulley of the steering system according to FIG. 1, and FIG. 3 shows a side view of one half of the motor shaft of FIG.
  • Steering system of Figure 1. 1 shows a schematic partial view of a vehicle steering system 10 in the region of a transmission assembly 12 for initiating a steering assist force.
  • the power steering is designed as a rack and pinion steering, in a known manner, a vehicle steering wheel is connected via a steering column with a pinion, wherein the pinion meshes with a rack 14 so that it is applied by a force applied to the steering wheel, manual steering force.
  • the rack 14 is coupled by a respective ball joint with tie rods and the tie rods with steerable wheels of the vehicle.
  • the invention also relates to so-called "steer-by-wire" steering, that is electromechanical power steering systems, in which there is no mechanical connection between the steering wheel and the rack 14.
  • the steering assist force is provided according to FIG. 1 by an electric motor 16, which drives a pulley 20 via a motor shaft 18.
  • the pulley 20 is coupled via a drive belt 22 with a rotatable about a longitudinal axis A drive wheel 24 of the gear assembly 12.
  • the drive wheel 24 is rotatably connected to a gear nut 26 which engages in a spindle portion of the rack 14 and converts a torque applied by the electric motor 16 in an axial steering assist force.
  • the gear assembly 12 is thus driven by the electric motor 16 so that it rotates about the longitudinal axis A and thereby displaces the rack 14 in the axial direction.
  • the existing plastic pulley 20 is shown, which is formed integrally and symmetrically to the axis of rotation B.
  • the pulley 20 has a hub 28 with three sections 30, 32, 34, which have a different inner diameter.
  • the first section 30 has a different surface finish, which in this embodiment is designed as a toothing 37, in particular as a straight toothing.
  • the tip circle diameter of the toothing 37 is smaller than the inner diameter of the hub 28 in the second and third sections 32, 34.
  • the second portion 32 is disposed between the first portion 30 and the third portion 34.
  • the lateral surface 38 of the pulley 20 preferably has a helical toothing.
  • the motor shaft 18 is shown having at one end a portion 40 with a toothing 36, which is in particular a straight toothing, which is in engagement with the toothing 37 on the hub 28 which forms the counter toothing.
  • the tip circle diameter of the toothing 36 is smaller than the outer diameter of the motor shaft 18.
  • a play-free seat of the teeth 36, 37 is present.
  • the toothing 36 is a knurling according to DIN 82, which is designed in particular as Geradrändelung.
  • the inner diameter of the second portion 32 of the hub 28 corresponds at most to the outer diameter at the adjacent portion 42 of the motor shaft 18, on which the hub 28 is seated at its second portion 32 with a press fit.
  • the hub 28 preferably has a third section 34 with an inner diameter which corresponds at least to the outer diameter of the motor shaft.
  • the second portion 32 is axially maximally as long as the portion 40 with the toothing 36 of the motor shaft 18th
  • the motor shaft 18 in section 42 has a diameter of about 12 mm
  • the hub 28 in the second section 32 has a diameter of about 12 mm
  • in the third section 34 has a diameter of about 12.5 mm.
  • a method for connecting the motor shaft 18 to the pulley 20, in particular a method can be used which comprises the following steps: a) pushing the motor shaft 18 with the end having the portion 40 with the teeth 36, as far as the hub 28, that the teeth 36 of the motor shaft 18 and the hub 28 just do not mesh, b) aligning the teeth 36 of the hub 28 and motor shaft 18 to each other, so that each face a tooth gap and thus allows axial insertion with little resistance and without deformation of material, and c) insertion of the motor shaft 18 to both sections 30, 40 with the teeth 36 completely interlock and the second Section 32 with the motor shaft 18 forms a press fit.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Pulleys (AREA)
  • Power Steering Mechanism (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

Système de direction (10) de véhicule, comprenant un variateur à courroie qui comporte un arbre de moteur (18) et une poulie (20) pour courroie montée sur l'arbre de moteur (18) et pourvue d'un moyeu (28), la poulie (20) pour courroie étant monobloc et constituée de plastique.
PCT/EP2016/066339 2015-07-10 2016-07-08 Système de direction de véhicule Ceased WO2017009252A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015111243.4A DE102015111243A1 (de) 2015-07-10 2015-07-10 Fahrzeug-Lenksystem
DE102015111243.4 2015-07-10

Publications (1)

Publication Number Publication Date
WO2017009252A1 true WO2017009252A1 (fr) 2017-01-19

Family

ID=56372912

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/066339 Ceased WO2017009252A1 (fr) 2015-07-10 2016-07-08 Système de direction de véhicule

Country Status (2)

Country Link
DE (1) DE102015111243A1 (fr)
WO (1) WO2017009252A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2704164A1 (fr) * 1993-04-19 1994-10-28 Sankyo Seiki Seisakusho Kk Corps rotatif en résine à arbre métallique.
EP0846895A1 (fr) * 1996-12-05 1998-06-10 Ford Global Technologies, Inc. Ensemble d'arbre et de poulie fixe pour une transmission à variation continue
JP2007196792A (ja) * 2006-01-25 2007-08-09 Nsk Ltd 電動式パワーステアリング装置
EP2128496A2 (fr) * 2008-05-26 2009-12-02 IMS Gear GmbH Roue à courroie dentée pour un entraînement de courroie dentée
DE102012020789A1 (de) * 2012-10-24 2014-04-24 Volkswagen Aktiengesellschaft Zahnriementrieb

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2636699A1 (fr) * 1988-09-16 1990-03-23 Electro Mec Nivernais Poulie, arbre et moteur comportant une telle poulie et son procede de realisation
DE102007023364A1 (de) * 2007-05-18 2008-11-20 Schaeffler Kg Riemenscheibe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2704164A1 (fr) * 1993-04-19 1994-10-28 Sankyo Seiki Seisakusho Kk Corps rotatif en résine à arbre métallique.
EP0846895A1 (fr) * 1996-12-05 1998-06-10 Ford Global Technologies, Inc. Ensemble d'arbre et de poulie fixe pour une transmission à variation continue
JP2007196792A (ja) * 2006-01-25 2007-08-09 Nsk Ltd 電動式パワーステアリング装置
EP2128496A2 (fr) * 2008-05-26 2009-12-02 IMS Gear GmbH Roue à courroie dentée pour un entraînement de courroie dentée
DE102012020789A1 (de) * 2012-10-24 2014-04-24 Volkswagen Aktiengesellschaft Zahnriementrieb

Also Published As

Publication number Publication date
DE102015111243A1 (de) 2017-01-12

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