WO2024022640A1 - Mécanisme de direction pour un système de direction d'un véhicule automobile, et système de direction - Google Patents

Mécanisme de direction pour un système de direction d'un véhicule automobile, et système de direction Download PDF

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Publication number
WO2024022640A1
WO2024022640A1 PCT/EP2023/063878 EP2023063878W WO2024022640A1 WO 2024022640 A1 WO2024022640 A1 WO 2024022640A1 EP 2023063878 W EP2023063878 W EP 2023063878W WO 2024022640 A1 WO2024022640 A1 WO 2024022640A1
Authority
WO
WIPO (PCT)
Prior art keywords
rack
steering gear
guide bushing
steering
gear housing
Prior art date
Application number
PCT/EP2023/063878
Other languages
German (de)
English (en)
Inventor
Sebastian Dambacher
Jochen Huber
Danh-Luan NGUYEN
Arthur Rupp
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 WO2024022640A1 publication Critical patent/WO2024022640A1/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
    • 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
    • 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
    • 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
    • F16C29/002—Elastic or yielding linear bearings or bearing supports
    • 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

Definitions

  • the invention relates to a steering gear for a steering system of a motor vehicle.
  • the invention further relates to a steering system for a motor vehicle.
  • EP 0241691 A2 discloses a rack and pinion steering system, in particular for motor vehicles, with a rack arranged axially displaceably in a steering gear housing and with a toothed pinion that can be driven by the steering wheel and is mounted in the steering gear housing and actuates the rack.
  • a rack-and-pinion steering system In a rack-and-pinion steering system, the rotational movement from the steering wheel is transmitted to the rack via a pinion and translated into a translational movement of the rack, which is transmitted to the wheel to be steered via a tie rod and other vehicle parts.
  • the rack is guided and supported by a cylindrical pressure piece.
  • the contact surface with the rack is usually implemented via another part, in particular an insert film, which ensures improved sliding and wear behavior.
  • the pressure piece assembly consisting of pressure piece, spring, adjusting screw and other sealing or damping elements has two primary tasks, on the one hand to ensure a play-free toothing engagement of the rack to the pinion under low loads and on the other hand to provide support for the rack under higher loads.
  • the pressure piece forces (in the axial and transverse directions) result from a tooth rejection force and a transverse force component of the tie rods, superimposed with acceleration forces in the event of dynamic loading.
  • the pressure piece In the unloaded or slightly loaded state, the pressure piece uses spring force to press the rack against the pinion and ensures a play-free toothing engagement. Under higher loads, the rack points away from the pinion and is supported by the pressure piece.
  • a pressure piece play must be set within a narrow range and maintained over a lifetime.
  • the pressure piece play can be adjusted tightly when new, but increases with increasing load due to wear. Too much pressure piece play can also have a negative effect on the steering feel and controller stability.
  • the contact area could be enlarged, for example, by using a larger pressure piece diameter.
  • this does not make sense due to the cylindrical shape and is usually not possible due to the installation space.
  • no further improvement can be achieved economically through material or lubrication.
  • the object of the invention is therefore to provide an improved steering gear, which makes it possible to reduce the load on the pressure piece and thus prevent an increase in the pressure piece play due to wear.
  • the task is achieved with a steering gear for a steering system of a motor vehicle with the features of patent claim 1. Furthermore, the task is solved with a steering system for a motor vehicle with the features of patent claim 11. Disclosure of the invention
  • the present invention provides a steering gear for a steering system of a motor vehicle.
  • the steering gear comprises a rack arranged axially displaceably in a steering gear housing and a toothed pinion that can be driven by a steering wheel and actuates the rack.
  • the steering gear further comprises a spring-loaded pressure piece supported in the steering gear housing, which generates a predetermined contact force between the rack and pinion, and a guide bushing axially inserted into the steering gear housing, which is designed to support the rack against a torque-induced spring force acting perpendicular to the rack, wherein in a first loading state of the rack, in which a spring force acting on the rack is less than a contact force applied by the pressure piece, the rack can be pressed against the gear pinion without play by the pressure piece, and wherein in a second loading state of the rack, in which the Spring force acting on the rack is greater than the contact pressure applied by the pressure piece, the rack can be supported by the guide bushing.
  • the present invention further creates a steering system for a motor vehicle, with a steering shaft that can be driven by a steering wheel and a steering gear according to the invention that is operatively connected to the steering shaft.
  • One idea of the present invention is to use the guide bushing in addition to the conventional pressure piece.
  • the bushing is installed from the side, axially to the rack. Due to the springing of the rack by a conventional pressure piece using a compression spring when the rack is under low load and the rack is supported by the guide bushing under higher loads, the guide bushing can advantageously reduce surface pressure and thus reduce wear due to a larger contact surface between the rack and guide bushing can be made possible.
  • the pressure piece can also be simplified and/or reduced in size since it is only subjected to low loads and precise pressure piece play adjustment is no longer necessary.
  • the assembly process can be simplified because the pressure piece adjustment process can be eliminated.
  • a pressure piece play greater than a play in the guide bushing can be set, the pressure piece being at least partially axially displaceable by the rack if the spring force acting on the rack is greater than that through the pressure piece applied contact pressure is. Because the rack is supported by the guide bushing, no higher force can be transmitted to the pressure piece.
  • the guide bushing has, axially at least in sections, a cross-sectional contour which faces the steering gear housing on a first side, in particular on a side in the assembled state of the guide bushing Side, is adapted to a cross-sectional contour of the steering gear housing and on a second side, in particular on a side facing the guide bushing of the rack in the assembled state, to a cross-sectional contour of the rack.
  • the steering gear housing has an axial groove on an upper inside of an opening of the steering gear housing in the assembled state, in which opening the guide bushing is arranged, into which an axially formed projection of the guide bushing is inserted. This can advantageously enable a positive connection between the guide bushing and the steering gear housing.
  • the axial projection of the guide bushing inserted into the axial groove of the steering gear housing is designed to align the guide bushing radially to the steering gear housing in a predetermined position. This advantageously causes the guide bushing to be mounted in a rotationally fixed manner in the steering gear housing.
  • a guide bushing play can be adjusted by providing the guide bushing with a predetermined eccentricity between an internal contact surface of the guide bushing to the rack and an external seating surface of the guide bushing in the steering gear housing.
  • the bushing play is adjusted by selective assembly. Sockets with different eccentricities between the inner contact surface and the outer seating surface are available, which means different wall thicknesses.
  • the guide bushing clearance is composed of a bushing installation space, in particular a free space between a rack back and the steering gear housing when the pinion is in engagement with the rack, and a wall thickness of the guide bushing.
  • the bushing with the appropriate wall thickness or eccentricity is selected in order to achieve the bushing clearance in the target area.
  • the number of bushing classes essentially depends on the following factors: range of the total tolerance of the assembly to be covered, tolerance of the wall thickness of individual bushings and how fine the grading of the bushings must be in order to achieve the targeted bushing clearance.
  • an axial length of the guide bushing is less than or equal to a distance from the opening of the steering gear housing to the pressure piece.
  • the guide bushing can thus be provided with compact dimensions.
  • an axial length of the guide bushing is greater than a distance measure from the opening of the steering gear housing to the pressure piece, with a lower side of the guide bushing in the assembled state, in particular a side facing the steering gear housing, having an opening through which the Pressure piece can be brought into contact with the rack. The pressure piece can thus be moved through the opening formed in the guide bushing.
  • a stop element in particular a stop ring, is arranged on an axial end section of the guide bushing for axially securing the guide bushing, wherein the stop element is further designed to provide a stop surface for a tie rod of the steering system.
  • the guide bushing can thus be axially fastened in the steering gear housing in an efficient manner.
  • FIG. 1 shows a longitudinal sectional view of a steering gear for a steering system of a motor vehicle according to a preferred embodiment of the invention
  • FIG. 2 is a cross-sectional view of the steering gear for the steering system of the motor vehicle according to the preferred embodiment of the invention
  • 3a is an enlarged longitudinal sectional view of the steering gear for the steering system of the motor vehicle according to the preferred embodiment of the invention
  • 3b is a perspective view of a guide bushing of the steering gear for the steering system of the motor vehicle according to the preferred embodiment of the invention.
  • 4a shows an enlarged longitudinal sectional view of the steering gear for the steering system of the motor vehicle according to a further preferred embodiment of the invention
  • 4b is a perspective view of the guide bushing of the steering gear for the steering system of the motor vehicle according to the further preferred embodiment of the invention.
  • Fig. 5 is a schematic representation of the steering system for the motor vehicle according to the preferred embodiment of the invention.
  • Fig. 1 shows a longitudinal sectional view of a steering gear 10 for a steering system 1 of a motor vehicle according to a preferred embodiment of the invention.
  • the steering gear 10 comprises a rack 14 arranged axially displaceably in a steering gear housing 12 and a toothed pinion 16 which can be driven by a steering wheel 2a and actuates the rack 14.
  • the steering gear 10 includes a spring-loaded pressure piece 18 supported in the steering gear housing 12, which generates a predetermined contact force Fl between the rack 14 and the pinion 16.
  • the steering gear 10 includes a guide bushing 20 which is axially inserted into the steering gear housing 12 and is designed to support the rack 14 against a torque-induced spring force F2 acting perpendicular to the rack 14.
  • a pressure piece play can be set to be greater than a play in the guide bushing 20.
  • the pressure piece 18 is at least partially axially displaceable by the rack 14 if the spring force F2 acting on the rack 14 is greater than the contact pressure Fl applied by the pressure piece 18.
  • a stop element 30, in particular a stop ring, for axially securing the guide bushing 20 is arranged on an axial end section of the guide bushing 20.
  • the stop element 30 is further designed to provide a stop surface for a tie rod of the steering system 1.
  • Fig. 2 shows a longitudinal sectional view of a cross-sectional view of the steering gear 10 for the steering system 1 of the motor vehicle according to the preferred embodiment of the invention.
  • the guide bushing 20 has, axially at least in sections, a cross-sectional contour which is adapted to a cross-sectional contour of the steering gear housing 12 on a first side 22, in particular on a side facing the steering gear housing 12 in the assembled state of the guide bushing 20.
  • the guide bushing 20 has, at least in sections, a cross-sectional contour on a second side 24, in particular on a side facing the rack 14 in the assembled state of the guide bushing 20, which is adapted to a cross-sectional contour of the rack 14.
  • the steering gear housing 12 has an axial groove 26, into which an axially formed projection 28 of the guide bushing 20 is inserted, on an upper inside side of an opening 12a of the steering gear housing 12 in the assembled state, in which opening the guide bushing 20 is arranged.
  • the axial projection 28 inserted into the axial groove 26 of the steering gear housing 12 Guide bushing 20 is designed to align the guide bushing 20 radially to the steering gear housing 12 in a predetermined position.
  • a guide bushing clearance is adjustable by providing the guide bushing 20 with a predetermined eccentricity between an internal contact surface of the guide bushing 20 to the rack 14 and an external seating surface of the guide bushing 20 in the steering gear housing 12.
  • the guide bushing clearance is composed of a bushing installation space, in particular a free space between a rack back and the steering gear housing 12 when the pinion 16 is in engagement with the rack 14, and a wall thickness of the guide bushing 20.
  • Fig. 3a shows an enlarged longitudinal sectional view of the steering gear 10 for the steering system 1 of the motor vehicle according to the preferred embodiment of the invention.
  • An axial length of the guide bushing 20 is greater than a distance from the opening 12a of the steering gear housing 12 to the pressure piece 18.
  • Fig. 3b shows a perspective view of a guide bushing 20 of the steering gear 10 for the steering system 1 of the motor vehicle according to the preferred embodiment of the invention.
  • a lower side of the guide bushing 20 in the assembled state, in particular a side facing the steering gear housing 12, has an opening through which the pressure piece 18 can be brought into contact with the rack 14.
  • an axial length of the guide bushing 20 is less than or equal to a distance from the opening 12a of the steering gear housing 12 to the pressure piece 18.
  • Fig. 4b shows a perspective view of the guide bushing 20 of the steering gear 10 for the steering system 1 of the motor vehicle according to the further preferred embodiment of the invention.
  • a lower side of the guide bushing 20 in the assembled state, in particular a side facing the steering gear housing 12, has no opening since an axial end section of the guide bushing 20 does not overlap with the pressure piece 18.
  • Fig. 5 shows a schematic representation of the steering system 1 for the motor vehicle according to the preferred embodiment of the invention.
  • the steering system 1 which is shown only symbolically in the present FIG. 3, has a steering wheel 2a connected to a steering shaft 2
  • Steering gear 10 and a pinion 16 which can be driven by the steering wheel 2a and actuates the rack 14.
  • the steering gear 10 is also connected to corresponding wheels 4, 5 to be steered.

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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 se rapporte à un mécanisme de direction (10) pour un système de direction (1) d'un véhicule automobile, doté d'une crémaillère (14) qui est agencée d'une manière déplaçable axialement dans un boîtier d'engrenage de direction (12), d'un pignon (16) qui peut être entraîné par un volant de direction (2a) et actionne la crémaillère (14), d'une pièce de pression à ressort (18) qui est supportée dans le boîtier d'engrenage de direction (12) et produit une force de pression prédéfinie (F1) entre la crémaillère (14) et le pignon (16) ; et d'une bague de guidage (20) qui est insérée axialement dans le boîtier d'engrenage de direction (12) et qui est configurée pour supporter la crémaillère (14) contre une force de ressort induite par couple (F2) qui agit perpendiculairement par rapport à la crémaillère (14), dans un premier état de charge de la crémaillère (14), dans lequel une force de ressort (F2) qui agit sur la crémaillère (14) est inférieure à une force de pression (F1) qui est appliquée par la pièce de pression (18), la crémaillère (14) peut être pressée sans jeu sur le pignon (16) par la pièce de pression (18), et, dans un second état de charge de la crémaillère (14), dans lequel la force de ressort (F2) qui agit sur la crémaillère (14) est supérieure à la force de pression (F1) qui est appliquée par la pièce de pression (18), la crémaillère (14) peut être supportée par la bague de guidage (20). L'invention se rapporte également à un système de direction (1) d'un véhicule automobile.
PCT/EP2023/063878 2022-07-29 2023-05-24 Mécanisme de direction pour un système de direction d'un véhicule automobile, et système de direction WO2024022640A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022207861.6A DE102022207861A1 (de) 2022-07-29 2022-07-29 Lenkgetriebe für ein Lenksystem eines Kraftfahrzeugs und Lenksystem
DE102022207861.6 2022-07-29

Publications (1)

Publication Number Publication Date
WO2024022640A1 true WO2024022640A1 (fr) 2024-02-01

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Family Applications (1)

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PCT/EP2023/063878 WO2024022640A1 (fr) 2022-07-29 2023-05-24 Mécanisme de direction pour un système de direction d'un véhicule automobile, et système de direction

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Country Link
DE (1) DE102022207861A1 (fr)
WO (1) WO2024022640A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0241691A2 (fr) 1986-03-08 1987-10-21 Adam Opel Aktiengesellschaft Direction à crémaillère, en particulier pour véhicule automobile
JP2009184591A (ja) * 2008-02-08 2009-08-20 Nsk Ltd ラックアンドピニオン式ステアリングギヤユニット
US20170050666A1 (en) * 2015-08-21 2017-02-23 Jtekt Corporation Steering system
WO2021009964A1 (fr) * 2019-07-12 2021-01-21 Ｋｙｂ株式会社 Dispositif de direction

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0241691A2 (fr) 1986-03-08 1987-10-21 Adam Opel Aktiengesellschaft Direction à crémaillère, en particulier pour véhicule automobile
JP2009184591A (ja) * 2008-02-08 2009-08-20 Nsk Ltd ラックアンドピニオン式ステアリングギヤユニット
US20170050666A1 (en) * 2015-08-21 2017-02-23 Jtekt Corporation Steering system
WO2021009964A1 (fr) * 2019-07-12 2021-01-21 Ｋｙｂ株式会社 Dispositif de direction

Also Published As

Publication number Publication date
DE102022207861A1 (de) 2024-02-01

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