EP3864311A1 - Palier lisse pour une barre d'accouplement d'un système de direction à commande électrique - Google Patents

Palier lisse pour une barre d'accouplement d'un système de direction à commande électrique

Info

Publication number
EP3864311A1
EP3864311A1 EP19783300.7A EP19783300A EP3864311A1 EP 3864311 A1 EP3864311 A1 EP 3864311A1 EP 19783300 A EP19783300 A EP 19783300A EP 3864311 A1 EP3864311 A1 EP 3864311A1
Authority
EP
European Patent Office
Prior art keywords
steering gear
coupling rod
steering
bearing bush
plain bearing
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.)
Pending
Application number
EP19783300.7A
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 EP3864311A1 publication Critical patent/EP3864311A1/fr
Pending 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
    • B62D5/04—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
    • B62D5/0448—Ball nuts
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C29/00—Bearings for parts moving only linearly
    • F16C29/02—Sliding-contact bearings
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C29/00—Bearings for parts moving only linearly
    • F16C29/12—Arrangements for adjusting play
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/02—Shafts; Axles
    • F16C3/03—Shafts; Axles telescopic
    • F16C3/035—Shafts; Axles telescopic with built-in bearings
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • F16C33/201—Composition of the plastic
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
    • 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
    • B62D3/126—Steering gears mechanical of rack-and-pinion type characterised by the rack
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/20—Thermal properties
    • F16C2202/22—Coefficient of expansion
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/20—Land vehicles
    • F16C2326/24—Steering systems, e.g. steering rods or columns

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 16.
  • the position of the steered wheels is not directly coupled to the steering input means, for example a steering wheel.
  • the steering input means for example a steering wheel.
  • the driver's steering request is picked up by a steering angle sensor and, depending on the driver's steering request, the position of the steered wheels is regulated via a steering actuator.
  • Coupling rod is secured against rotation in a simple manner.
  • a steering gear for a steer-by-wire steering system is one
  • Motor vehicle having a coupling rod mounted in a steering gear housing, on which a threaded spindle is formed, which is surrounded by a spindle nut, which is part of a screw transmission, provided, the coupling rod being displaceable along the longitudinal axis by means of the screw transmission, and wherein the coupling rod in the steering gear housing is slidably supported along the longitudinal axis by means of a slide bearing, the slide bearing being set up to compensate for thermal expansion between the steering gear housing and the spindle nut.
  • the plain bearing the play between the coupling rod and the plain bearing can be adjusted so that an optimal tribological and acoustic performance of the steering gear can be achieved.
  • the slide bearing is preferably set up to define the play between the coupling rod and the steering gear housing within an operating temperature range
  • the plain bearing bush is preferably made of a plastic, POM, PA, PEEK, PTFE or with a plastic coating, particularly preferably made of PA66GF30 (polyamide 66 with glass fiber reinforcement with 30% by volume).
  • the plain bearing can be made in one or more parts. It can be connected to the coupling rod and / or the steering gear housing by means of integrated or additional elastic elements. Depending on the production concept, the geometry of the coupling rod in the functional area of the bearing can be optimized for forming or machining. In addition, an emergency operation function can be provided in the event of great wear or damage to the slide bearing, for example via direct contact between Coupling rod and steering gear housing from a certain twist.
  • the helical gear mechanism is preferably a
  • the slide bearing is preferably positively connected to the steering gear housing and the sliding surfaces, in which the slide bearing is in contact with the coupling rod, are preferably designed in such a way that the slide bearing forms an anti-rotation device in interaction with the coupling rod.
  • the plain bearing comprises a plain bearing bush which surrounds the coupling rod.
  • a plain bearing bush is particularly space-saving, since it requires little installation space.
  • the coupling rod is preferably made of steel and the steering gear housing made of aluminum.
  • the plain bearing bushing is formed from a material which has a coefficient of thermal expansion in a range from 2 * 5 : 1 to 5 - ⁇ QK 1 , preferably larger and especially between and 4 ⁇ io k i .
  • the plain bearing bush is preferably essentially cylindrical
  • the opening or the coupling rod in the area of engagement with the slide bearing bush can be designed as a regular or irregular polygon or as a polygon or as a polygon profile. It can be provided that the plain bearing bush from a first Has outgoing outgoing, protruding into the lateral surface and extending parallel to the longitudinal direction, by means of which the
  • Expansion behavior of the plain bearing bush can be influenced.
  • Spring arms which are evenly spaced apart in the circumferential direction can preferably be provided, which bear against the steering gear housing in the installed state of the slide bearing bushing and one
  • Plain bearing bush At least two spring arms are preferably provided, particularly preferably three spring arms are provided. It is advantageous if the spring arms are arranged between or in recesses of the slide bearing bush on the outside and extend parallel to the longitudinal direction and, viewed radially, lie in the region of the circular envelope, also referred to as an enveloping circle, of the slide bearing bush.
  • the spring arms preferably have projections at their free ends, which protrude outwards from the envelope and thus in the installed state with them
  • the spring arms extend approximately from the middle of the jacket height of the plain bearing bush to a second end of the plain bearing bush, the second end along one of the longitudinal axis
  • a seat in the steering gear housing for the plain bearing bush is essentially cylindrical in cross section and has grooves extending in the longitudinal direction, into which on the outside of the
  • 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 means and outputs a feedback signal to the steering input means in response to the driver's request and a driving state of the motor vehicle
  • Control unit transmitted, provided, wherein the control unit controls the steering gear in order to transform the driver's request into a deflection of the steered wheels and wherein the steering gear is designed as described above. It is advantageous if the coupling rod for steering the wheels of the motor vehicle is connected to tie rods.
  • FIG. 1 a schematic representation of a steer-by-wire steering system
  • FIG. 2 a longitudinal section through a steering gear with ball screw and coupling rod
  • FIG. 3 a top view of one end of the coupling rod
  • FIG. 4 a spatial view of the coupling rod
  • Figure 6 shows a cross section through the plain bearing bush
  • FIG. 6A a detailed view of FIG. 6.
  • 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 does this by turning a steering input means 3, which in the example is a steering wheel
  • a feedback actuator 4 is attached to the steering shaft 2, which serves to simulate the repercussions from the road 60 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.
  • 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.
  • the control unit controls an electric steering actuator 5, which controls the position of the steered wheels 6, as a function of the signal from the angle of rotation sensor and further input variables.
  • the steering actuator 5 is part of a steering gear 7 having a coupling rod which is displaceably mounted in a steering gear housing 8.
  • the coupling rod acts indirectly on the steered wheels 6 via tie rods 9 and other components.
  • FIG. 2 shows a longitudinal section through a steering gear 7 according to the invention with a drivable ball screw drive 10.
  • a ball nut 11 is arranged coaxially to the longitudinal axis 100 of the steering gear 7 and is penetrated coaxially to the longitudinal axis 100 by a ball screw spindle 12 formed on a coupling rod 16.
  • a torque can be transmitted from the ball nut 11 via balls 13 to the ball screw 12.
  • the ball nut 11 is rotatably mounted in the steering gear housing 8 by means of two ball bearings 14. A rotary movement of the ball nut 11 is converted into a translatory movement of the ball screw 12 along the longitudinal axis 100.
  • FIG. 3 shows the steering gear 7 in a top view of the end of the coupling rod 16 remote from the ball screw. In this area, the coupling rod 16 has a non-circular profile in cross section.
  • the ball screw 12 is formed on a first end region 15 of the coupling rod 16.
  • the coupling rod 16 is a second end region 18 opposite the first end region along the longitudinal axis 100 by means of a slide bearing bush 19 in the Steering gear housing, not shown, slidably mounted.
  • the coupling rod 16 has a non-circular profile in cross section, which in interaction with the slide bearing bush 19
  • the outer peripheral surface of the coupling rod in the end region 18 is out of round and represents a pentagon or the corresponding inner surface of the slide bearing bush 19.
  • Coupling rod can be transferred to the steering gear housing and a defined torsional backlash and a defined torsional rigidity can be set.
  • the slide bearing bush 19 has incisions 22, which extend from a first end face 21 and protrude into the lateral surface and extend parallel to the longitudinal direction 100, by means of which the expansion behavior of the slide bearing bush 19 can be influenced. are also on the
  • spaced-apart spring arms 23 are provided which, in the installed state, bear against the steering gear housing 8 and enable vibration damping.
  • the spring arms 23 are arranged between recesses 24 of the slide bearing bush 24 on the outside.
  • the spring arms 23 extend parallel to the longitudinal direction 100 and, viewed radially, lie in the region of the circular envelope 290 of the slide bearing bushing 19. At their free ends, the spring arms 23 have projections 25 which protrude from the envelope 290 and thus have their entire surface 26 in the installed state rest on the steering gear housing 8.
  • the spring arms 23 extend approximately from the center of the jacket height of the plain bearing bush to a second end of the plain bearing bush 26, the second end 30 along the longitudinal axis on an opposite side from the first end assigned first end face 21. As shown in FIG. 4, the second end 30 is oriented toward the ball screw drive in the installed state.
  • FIGS. 6 and 6A show the slide bearing bush 19 installed in the steering gear housing 8 and the coupling rod 16 enclosed by the slide bearing bush 19 in accordance with a further embodiment.
  • Slide bearing bush 19 is positively connected to the steering gear housing 8.
  • the seat 27 in the steering gear housing 8 is essentially cylindrical in cross section and has grooves 28 extending in the longitudinal direction 100, into which corresponding webs 29 on the outside of the slide bearing bush 19 engage to form the anti-rotation device.
  • the webs 29 are evenly spaced over the circumference.
  • the exemplary embodiment shows three webs 29.
  • the webs 29, like the spring arms, extend only over part of the jacket height of the slide bearing bush 19 (see FIGS. 5A-5C), preferably approximately over half. They are assigned to the same end 26 as the spring arms 23.
  • the coupling rod 16 has a triangular shape. The invention is not limited to this form of the coupling rod. Other shapes are also conceivable, which also have a non-circular geometry and are suitable for plain bearings and anti-rotation.
  • the coupling rod 16 and the steering gear housing 8 are formed from different materials.
  • the coupling rod 16 is made in particular from steel and the steering gear housing 8 from aluminum. The two
  • the plain bearing bush 19 is set up to set the play d between the coupling rod 16 and the steering gear housing 8 over an operating temperature range T min to T max within defined limit values 5 min ⁇ E max .
  • the plain bearing bush 19 thus compensates for the thermal expansions of the coupling rod 16 and the plain bearing bush 19.
  • the plain bearing bush 19 is preferably formed from a material which has a greater thermal expansion than aluminum and steel.
  • the slide bearing bush 19 is preferably made of a plastic, POM, PA, PEEK, PTFE or with a plastic coating, particularly preferably made of PA66GF30 (polyamide 66 with glass fiber reinforcement with 30% by volume).
  • FIG. 6A shows the two-dimensional case in which the thermal expansion depends only on the radii, the wall thicknesses in the radial direction and the thermal expansion coefficients of the three components coupling rod 16, slide bearing bush 19 and steering gear housing 8. In this case (and with a simplified rotationally symmetrical geometry) this is from
  • the formula gives the optimal dimensioning of the plain bearing bush with regard to thermal expansion coefficient a 2 and wall thickness t 2 .

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Ocean & Marine Engineering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

L'invention concerne un mécanisme de direction (7) pour un système de direction à commande électrique (1) d'un véhicule automobile comprenant une barre d'accouplement (16) montée dans un carter de direction (8), sur laquelle est formée une broche filetée (12), qui est entourée par un écrou de broche (11), qui font partie d'un engrenage à vis (10), la barre d'accouplement (16) pouvant être déplacée le long de l'axe longitudinal (100) au moyen de l'engrenage à vis (10), la barre d'accouplement (16) étant montée dans le carter de direction (8) au moyen d'un palier lisse (19) de manière à pouvoir être déplacée le long d'un axe longitudinal (100), et le palier lisse (19) étant adapté pour compenser les dilatations thermiques entre le carter de direction (8) et l'écrou de broche (11).
EP19783300.7A 2018-10-09 2019-10-04 Palier lisse pour une barre d'accouplement d'un système de direction à commande électrique Pending EP3864311A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018124905.5A DE102018124905A1 (de) 2018-10-09 2018-10-09 Gleitlager für eine Koppelstange eines Steer-by-Wire-Lenkgetriebes
PCT/EP2019/076905 WO2020074385A1 (fr) 2018-10-09 2019-10-04 Palier lisse pour une barre d'accouplement d'un système de direction à commande électrique

Publications (1)

Publication Number Publication Date
EP3864311A1 true EP3864311A1 (fr) 2021-08-18

Family

ID=68159125

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19783300.7A Pending EP3864311A1 (fr) 2018-10-09 2019-10-04 Palier lisse pour une barre d'accouplement d'un système de direction à commande électrique

Country Status (5)

Country Link
US (1) US20220048561A1 (fr)
EP (1) EP3864311A1 (fr)
CN (1) CN112840137B (fr)
DE (1) DE102018124905A1 (fr)
WO (1) WO2020074385A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021201267A1 (de) 2021-02-10 2022-08-11 Volkswagen Aktiengesellschaft Lenksystem für ein Kraftfahrzeug und Verfahren zum Montieren eines Lenksystems für ein Kraftfahrzeug
DE102021125747A1 (de) 2021-10-05 2023-04-06 Schaeffler Technologies AG & Co. KG Linearaktuator sowie Achslenkung mit einem solchen Linearaktuator
DE102021125770A1 (de) 2021-10-05 2023-04-06 Schaeffler Technologies AG & Co. KG Lenkaktuator
DE102022104980A1 (de) * 2022-03-03 2023-09-07 Schaeffler Technologies AG & Co. KG Lenkungsaktuator
DE102022202506A1 (de) 2022-03-14 2023-09-14 Volkswagen Aktiengesellschaft Lenkstange für ein Lenkgetriebe einer Steer-by-wire-Kraftfahrzeuglenkung sowie Lenkgetriebe einer Steer-by-wire-Kraftfahrzeuglenkung
DE102022129138A1 (de) 2022-11-04 2024-05-08 Schaeffler Technologies AG & Co. KG Lenkungsaktuator

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Also Published As

Publication number Publication date
CN112840137B (zh) 2023-07-07
US20220048561A1 (en) 2022-02-17
WO2020074385A1 (fr) 2020-04-16
DE102018124905A1 (de) 2020-04-09
CN112840137A (zh) 2021-05-25

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