EP3841316A1 - Mécanisme de direction à commande électrique comprenant un moteur à arbre creux et un système vis-écrou - Google Patents

Mécanisme de direction à commande électrique comprenant un moteur à arbre creux et un système vis-écrou

Info

Publication number
EP3841316A1
EP3841316A1 EP19756359.6A EP19756359A EP3841316A1 EP 3841316 A1 EP3841316 A1 EP 3841316A1 EP 19756359 A EP19756359 A EP 19756359A EP 3841316 A1 EP3841316 A1 EP 3841316A1
Authority
EP
European Patent Office
Prior art keywords
steering
gear
screw
steer
steering gear
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.)
Withdrawn
Application number
EP19756359.6A
Other languages
German (de)
English (en)
Inventor
Wolfram RAITHER
Philippe Steck
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.)
ThyssenKrupp AG
ThyssenKrupp Presta AG
Original Assignee
ThyssenKrupp AG
ThyssenKrupp Presta AG
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 ThyssenKrupp AG, ThyssenKrupp Presta AG filed Critical ThyssenKrupp AG
Publication of EP3841316A1 publication Critical patent/EP3841316A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B62D5/001—Mechanical components or aspects of steer-by-wire systems, not otherwise provided for in this maingroup
    • B62D5/005—Mechanical components or aspects of steer-by-wire systems, not otherwise provided for in this maingroup means for generating torque on steering wheel or input member, e.g. feedback
    • B62D5/006—Mechanical components or aspects of steer-by-wire systems, not otherwise provided for in this maingroup means for generating torque on steering wheel or input member, e.g. feedback power actuated
    • 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
    • B62D5/0427—Electric motor acting on or near steering gear the axes of motor and final driven element of steering gear, e.g. rack, being parallel the axes being coaxial
    • 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
    • B62D5/0442—Conversion of rotational into longitudinal movement
    • B62D5/0445—Screw drives
    • 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
    • B62D5/0442—Conversion of rotational into longitudinal movement
    • B62D5/0454—Worm gears
    • 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
    • B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
    • B62D5/046—Controlling the motor
    • 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
    • B62D6/008—Control of feed-back to the steering input member, e.g. simulating road feel in steer-by-wire applications
    • 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
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
    • 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
    • B62D5/001—Mechanical components or aspects of steer-by-wire systems, not otherwise provided for in this maingroup
    • 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
    • F16H2025/2075—Coaxial drive motors
    • 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
    • F16H2025/2075—Coaxial drive motors
    • F16H2025/2078—Coaxial drive motors the rotor being integrated with the nut or screw body

Definitions

  • the present invention relates to a steering gear for a steer-by-wire steering system of a motor vehicle with the features of the preamble of claim 1 and a steer-by-wire steering system with the features of the preamble of claim 8.
  • the position of the steered wheels is not directly coupled to the steering input means, for example a steering wheel.
  • DE 10 2006 008 911 A1 discloses a steering system for a motor vehicle with a hollow shaft motor, through the hollow shaft of which a rod is guided which can be driven in the longitudinal direction by means of the electric motor and when used in an auxiliary power steering in a region as a rack for engagement with a steering pinion is trained.
  • the hollow shaft is rotatably connected to a pulley.
  • the belt gear forms an intermediate gear to a rolling element screw gear.
  • a steering gear for a steer-by-wire steering system is one
  • Motor vehicle having a hollow shaft motor with a housing-fixed stator and a rotatably mounted rotor, which is arranged coaxially to a longitudinal axis and is penetrated by a screw gear, the screw gear comprising a spindle nut arranged coaxially to the longitudinal axis, which is drivingly connected to the rotor and which sits on a spindle which can be displaced along the longitudinal axis by means of the hollow shaft motor, and the pitch angle of the screw transmission is less than 4.5 °, in particular less than 4 ° and particularly preferably less than 3.5 °.
  • Torque into an axial force where f is the angle of friction and a is the pitch angle.
  • the ball screw is self-locking below a defined value.
  • the angle of friction is preferably less than 4.4 ° and greater than 0.1 °.
  • the screw gear is a roller screw gear, in particular a ball screw or a roller screw.
  • the screw gear is a trapezoidal screw drive. It can be provided that the rotor sits directly on the nut and is connected to it in a rotationally fixed manner. It is advantageous if the rotor coaxially surrounds the nut. However, an intermediate gear can also be provided, which reduces the speed of the hollow shaft motor and connects the rotor to the nut.
  • a steer-by-wire steering system for a motor vehicle comprises:
  • a feedback actuator which can be acted upon by a driver with a driver request for a steering angle via a steering input device and which outputs a feedback signal to the steering input device in response to the driver request and a driving state of the motor vehicle
  • Control unit transmitted, provided, the control unit controls the steering gear to the
  • the spindle itself is preferably designed as a steering rod which is connected to tie rods for steering the wheels of the motor vehicle.
  • Fig. 2 a longitudinal section through a steering gear with a hollow shaft motor
  • a steer-by-wire steering system 1 is shown in FIG. On a steering shaft 2, a rotation angle sensor (not shown) is attached, which one by rotating a steering input means 3, which in the example as a steering wheel
  • a feedback actuator 4 is attached to the steering shaft 2, which serves to simulate the repercussions from the roadway 70 on the steering wheel 3 and thus to give the driver feedback on the steering and driving behavior of the vehicle.
  • the driver's steering request is based on the one measured by the rotation angle sensor
  • the feedback actuator monitor unit transmits the driver's steering request to a control unit 5.
  • the feedback actuator monitor unit preferably also takes over the control of the feedback actuator 4.
  • the feedback actuator monitor unit can also be formed integrally with the control unit 5.
  • the control unit 5 controls in
  • an electric steering actuator 6 which controls the position of the steered wheels 7.
  • the steering actuator 6 is part of a steering gear 8 having a steering rod 9. It acts indirectly on the steered wheels 7 via tie rods 10 and other components.
  • FIG. 2 shows a longitudinal section through a steering gear 8 according to the invention with ball screw 11 and hollow shaft motor 12 along their longitudinal axis 100.
  • the hollow shaft motor 12 is preferably permanently excited and has a hollow cylindrical shape. It consists of a stator 13 and a rotor 14 which is embedded in the stator 13. Stator 13 and rotor 14 are coaxial with the longitudinal axis 100.
  • the rotor 14 is rotatably mounted about the longitudinal axis 100 and has a hollow cylindrical shape.
  • the rotor 14 sits on a ball nut 15 and is connected to it in a rotationally fixed manner. It can also be provided that the rotor 14 via an intermediate gear
  • an intermediate gear can be provided which connects the rotor 14 to the ball nut 15 in the power flow.
  • the intermediate gear is preferably a planetary gear or a harmony drive.
  • the ball nut 15 is coaxial with the longitudinal axis 100
  • a torque is transmitted from the ball nut 15 via balls 17 to the ball screw 16.
  • the ball nut 15 is rotatably mounted in a housing 19 by means of a ball bearing 18.
  • a rotary movement of the hollow shaft motor 12 is converted into a translatory movement of the ball screw 16 along the longitudinal axis 100.
  • the ball screw drive 11 has a large transmission ratio (small pitch angle a). This allows electric motors with lower torque to be used.
  • the torque of an electric motor is approximately
  • the lead angle a of the ball screw is preferably less than 4 °.
  • the ratio of the thread pitch s to the ball center circle diameter of the ball screw D is less than 0.22, because the following relationship applies
  • FIG. 3 shows the efficiency h as a function of the gradient angle a for eight different friction angles f.
  • the angle of friction in the form of tan ( ⁇ ) decreases along the Y axis, from bottom to top. Below the dashed line, the ball screw is self-locking, i.e. H. the angle of inclination a ⁇ friction angle f applies approximately.
  • the angle of friction is preferably less than 4.4 ° and greater than 0.1 °.
  • the ball screw drive used in FIG. 2 preferably has a pitch angle of less than 4.5 °, in particular less than 4 °.

Landscapes

  • 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)
  • Steering Control In Accordance With Driving Conditions (AREA)

Abstract

L'invention concerne un mécanisme de direction (8) pour un système de direction à commande électrique (1) d'un véhicule automobile, qui comporte un moteur à arbre creux (12) pourvu d'un stator (13) solidaire du carter et d'un rotor (14) monté de manière à pouvoir tourner, qui est disposé de manière coaxiale par rapport à un axe longitudinal (100) et est traversé par un engrenage hélicoïdal (11). L'engrenage hélicoïdal (11) comprend un écrou de broche (15) disposé de manière coaxiale par rapport à l'axe longitudinal (100), qui est relié en entraînement au rotor (14) et qui repose sur une broche (16), qui peut être coulissée le long de l'axe longitudinal (100) au moyen du moteur à arbre creux (12). L'angle d'inclinaison (α) de l'engrenage hélicoïdal (11) est inférieur à 4,5°.
EP19756359.6A 2018-08-21 2019-08-20 Mécanisme de direction à commande électrique comprenant un moteur à arbre creux et un système vis-écrou Withdrawn EP3841316A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018120266.0A DE102018120266A1 (de) 2018-08-21 2018-08-21 Steer-by-Wire-Lenkgetriebe mit Hohlwellenmotor und Kugelgewindetrieb
PCT/EP2019/072285 WO2020038952A1 (fr) 2018-08-21 2019-08-20 Mécanisme de direction à commande électrique comprenant un moteur à arbre creux et un système vis-écrou

Publications (1)

Publication Number Publication Date
EP3841316A1 true EP3841316A1 (fr) 2021-06-30

Family

ID=67704523

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19756359.6A Withdrawn EP3841316A1 (fr) 2018-08-21 2019-08-20 Mécanisme de direction à commande électrique comprenant un moteur à arbre creux et un système vis-écrou

Country Status (5)

Country Link
US (1) US20220111885A1 (fr)
EP (1) EP3841316A1 (fr)
CN (1) CN112585380A (fr)
DE (1) DE102018120266A1 (fr)
WO (1) WO2020038952A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020260399A1 (fr) * 2019-06-28 2020-12-30 Airbus Operations Gmbh Aile destinée à un aéronef
DE102020203362A1 (de) 2020-03-17 2021-09-23 Robert Bosch Gesellschaft mit beschränkter Haftung Einzelradlenkung
CN116176688B (zh) * 2023-02-10 2024-01-19 杭州擎动智行科技有限公司 基于轴向助力式电驱单元的车辆线控转向装置及控制方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2278793Y (zh) * 1996-10-25 1998-04-15 杨爱华 一种辊式滚动丝杠
US5975234A (en) * 1997-12-03 1999-11-02 Trw Inc. Electric steering system with plastic motor tube
JP4516479B2 (ja) * 2005-05-24 2010-08-04 株式会社日立製作所 回転直動変換機構
DE102006008911A1 (de) * 2006-02-27 2007-08-30 Zf Lenksysteme Gmbh Lenkung mit Hohlwellen-Elektromotor und Zwischengetriebe
DE102006048614A1 (de) * 2006-10-13 2008-04-17 Magna Powertrain Ag & Co Kg Hinterradlenkungs-Aktuator
DE102008059745A1 (de) * 2008-12-01 2010-06-02 Thyssenkrupp Presta Ag Elektromechanische Servolenkung mit Kugelgewindetrieb
US10371275B2 (en) * 2014-10-10 2019-08-06 Onesubsea Ip Uk Limited Actuator having electric drive for actuating a valve device
DE102015015148A1 (de) * 2015-11-25 2017-06-01 Thyssenkrupp Ag Feedback-Aktuator für eine Lenkeinrichtung
DE102016007540A1 (de) * 2016-06-22 2017-12-28 Thyssenkrupp Ag Kugelgewindetrieb einer elektromechanischen Servolenkung mit integriertem Schrägkugellager und Kompensation unterschiedlicher Wärmeausdehnungen

Also Published As

Publication number Publication date
US20220111885A1 (en) 2022-04-14
WO2020038952A1 (fr) 2020-02-27
DE102018120266A1 (de) 2020-02-27
CN112585380A (zh) 2021-03-30

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