WO2022038027A1 - Système de direction comprenant trois parties de boîtier et des éléments de transmission montés dans celles-ci - Google Patents

Système de direction comprenant trois parties de boîtier et des éléments de transmission montés dans celles-ci Download PDF

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Publication number
WO2022038027A1
WO2022038027A1 PCT/EP2021/072447 EP2021072447W WO2022038027A1 WO 2022038027 A1 WO2022038027 A1 WO 2022038027A1 EP 2021072447 W EP2021072447 W EP 2021072447W WO 2022038027 A1 WO2022038027 A1 WO 2022038027A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing part
steering system
gear
bearing
shaft
Prior art date
Application number
PCT/EP2021/072447
Other languages
German (de)
English (en)
Inventor
Jens-Uwe Hafermalz
Ekkehard Kneer
Dennis Fuechsel
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 WO2022038027A1 publication Critical patent/WO2022038027A1/fr

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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
    • B62D5/0421—Electric motor acting on or near steering gear
    • 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
    • B62D5/0403—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 constructional features, e.g. common housing for motor and gear box

Definitions

  • the invention relates to a steering system for a motor vehicle.
  • Power steering systems are installed in most motor vehicles, which generate an assisting torque during steering and thereby reduce the steering torque to be applied by a driver to a steering column of the respective motor vehicle.
  • the known power steering systems are based on a steering gear, which converts the drive power of a hydraulic or electric steering motor and transmits it to, for example, the steering column or a rack connected to wheel steering levers.
  • Such steering gears may include one or more splined shafts rotatably mounted within a housing of the steering gear.
  • the shafts can be mounted in rotary bearings, one of which is designed as a so-called fixed bearing and the other as a so-called floating bearing.
  • the fixed bearing ensures that the associated shaft is fixed axially relative to the housing, while the floating bearing allows at least axial mobility of the section of the shaft accommodated therein relative to the housing (cf. e.g. EP 1 914 430 A1 or EP 102016 122 644 A1 ).
  • the fixed bearing enables the shaft to pivot about a pivot axis aligned perpendicular to its longitudinal axis, while the floating bearing of the shaft permits the deflections of the shaft resulting from such pivoting (cf.
  • Such pivotability can be used, for example, to compensate for gear play that develops due to component tolerances, different thermal expansions of the gear elements or due to wear, for which purpose the toothing of such a pivotable shaft is pressed by means of one or more spring elements into the toothing of a gear element that interacts with it will.
  • the invention is based on the object of demonstrating a steering system that is particularly advantageous in terms of production costs. This problem is solved in a steering system according to patent claim 1 .
  • Advantageous embodiments of such a steering system are the subject matter of the further patent claims and/or result from the following description of the invention.
  • a steering system comprises a housing and a screw pinion shaft which is rotatably mounted in a first housing part of the housing by means of a first pivot bearing and a second pivot bearing and which comprises a first pinion toothing.
  • a gear wheel is included, which is preferably arranged in the first housing part, wherein the gear wheel is in meshing engagement with the first pinion teeth of the screw pinion shaft.
  • a gear shaft is provided, which is mounted in a second housing part by means of a third pivot bearing, which is also connected to the gear in a rotationally fixed manner and which also includes a second pinion toothing, the second pinion toothing being in toothing engagement with a (first) toothing section of a toothed rack .
  • the toothed rack is mounted in a third housing part of the housing in an axially displaceable manner.
  • This (at least) three-part design of the housing, each with at least one gear component (screw pinion shaft, gear wheel, gear wheel shaft and toothed rack) movably mounted therein, allows an advantageous structural design of the steering system to be implemented, which is characterized in particular by advantageous manufacturability and assembly.
  • the first housing part and/or the second housing part and/or the third housing part, in particular all three housing parts is/are (each) configured in one piece and therefore, for example, no configuration of two or more partial shells of the respective Housing part / housing parts is required for assembly.
  • the design of the steering system according to the invention also allows as many identical components as possible to be used in order to provide different steering systems according to the invention which, for example, only differ in terms of different installation positions in a motor vehicle comprising the steering system.
  • the different installation positions can, for example, result in different angles or alignments of the first housing part and the second housing part with respect to one another.
  • the pivot bearings can each include at least one pivot bearing, in particular in the form of a roller bearing, with the respective pivot bearing of the pivot bearings or a respective outer bearing ring thereof is preferably mounted or arranged directly in the respective housing part.
  • provision can preferably be made for the screw pinion shaft and/or the gear wheel shaft to be mounted directly within the or the associated rotary bearing or inner bearing rings thereof.
  • the first housing part is detachably connected to the second housing part and/or that the second housing part is detachably connected to the third housing part. This in turn can have an advantageous effect on the adjustability of a steering system according to the invention.
  • the pivot bearing is then designed as a so-called fixed bearing. In particular in combination with an arrangement of the third pivot bearing between the gear wheel and the second pinion toothing, this can result in an advantageous support of forces and moments acting on the gear wheel shaft.
  • the gear wheel shaft it can also preferably be provided that it is mounted in the first housing part or the third housing part by means of a fourth pivot bearing.
  • the fourth pivot bearing can particularly preferably be arranged on the side of the gear wheel or the second pinion toothing facing away from the third pivot bearing, resulting in a relatively large distance between the third pivot bearing and the fourth pivot bearing, which is advantageous for the support of the gear shaft tilting moments acting in the area of the third pivot bearing.
  • the fourth pivot bearing can preferably be designed in such a way that it supports the gear wheel shaft only radially (and not also axially).
  • the fourth pivot bearing can therefore be designed as a so-called loose bearing, which among other things different, thermally induced elongations of the gear shaft and the housing can be compensated.
  • the first rotary bearing is designed as a fixed bearing and the second rotary bearing as a floating bearing of the screw pinion shaft. Provision can furthermore preferably be made for the first pivot bearing to allow the screw pinion shaft to pivot about a pivot axis aligned perpendicularly to its longitudinal axis, while the second pivot bearing permits the deflections of the screw pinion shaft resulting from such pivoting.
  • This pivotability can be used, for example, to compensate for gear play that develops due to component tolerances, different thermal expansions of the screw pinion shaft and/or the gear wheel or due to wear, for which purpose the first pinion toothing is pressed into the toothing of the gear wheel by means of one or more spring elements can.
  • a steering system according to the invention can in particular be designed in such a way that the toothed rack comprises a second toothing section which is in toothing engagement with a third pinion toothing which is part of a steering column.
  • the steering column can interact in particular with a steering handle, for example a steering wheel, and/or with a torque sensor.
  • a steering system according to the invention is therefore designed as a power steering system in which a steering motor of the steering system, which is preferably drivingly connected to the screw pinion shaft, generates a steering torque that only supports a steering torque applied manually by means of the steering handle.
  • the invention also relates to a motor vehicle with a steering system according to the invention.
  • Fig. 2 a first cross section through the steering system
  • Fig. 3 a second cross section through the steering system.
  • 1 and 2 show an embodiment of a steering system according to the invention.
  • This comprises a multi-part housing 1, with a gear wheel 2 and a screw pinion shaft 3 meshing with the gear wheel 2 being rotatably mounted within a first housing part 1a.
  • the screw pinion shaft 3 has a (first) pinion toothing 25 .
  • the gear wheel 2 is connected in a torque-proof manner to a gear wheel shaft 4 , the gear wheel shaft 4 likewise comprising a (second) pinion toothing 26 .
  • the gear shaft 4 is arranged within the first housing part 1a, a second housing part 1b and a third housing part 1c. While the first housing part 1a and the second housing part 1b are each designed in one piece, the third housing part 1c can be designed in several parts and in particular in two parts.
  • the gear shaft 4 engages with its pinion toothing 26 in a (first) toothed section 36 of a toothed rack 5, which is mounted in an axially displaceable manner in the third housing part 1c.
  • a pressure piece unit 19 which has a pressure piece 20 that is movably guided in a corresponding receptacle in the third housing part 1c and is pressed against the toothed rack 5 by means of a spring washer 37, ensures that the teeth of the gear wheel shaft 4 and the toothed rack 5 mesh with one another with as little play as possible.
  • a steering motor 27 see FIG. 1; e.g. an electric motor
  • the rack 5 also includes a second toothed section (not visible), which meshes with a pinion toothing of a steering column (not shown), the steering column being non-rotatably connected to a steering wheel (not shown) and interacting with a torque sensor (not shown). , through which the torque transmitted to the steering column by means of the steering wheel can be determined.
  • the section 1d of the third housing part 1, which accommodates a rotary bearing for the steering column and the torque sensor, can be seen in FIGS. 1 and 2.
  • the steering system is therefore designed as a power steering system in which a steering torque is generated by means of the steering motor 27 only acts in support of a steering torque applied manually by means of the steering wheel.
  • the screw pinion shaft 3 has an end on the drive side, via which it is connected to an output shaft of the steering motor 27 .
  • the screw pinion shaft 3 is mounted in the housing 1 by means of a first rotary bearing 6 (cf. FIG. 3).
  • This first rotary bearing 6 is designed as a fixed bearing and consequently causes the screw pinion shaft 3 to be secured in the axial position overall within the first housing part 1a.
  • this first pivot bearing 6 enables a limited pivoting of the screw pinion shaft 3 about a pivot axis which is aligned perpendicularly with respect to the plane of the drawing in FIG.
  • Such pivoting causes a deflection of the end of the screw pinion shaft 3 opposite the drive end, which is mounted there in a corresponding receptacle of the first housing part 1a by means of a second pivot bearing 7, which is designed as a floating bearing.
  • This second rotary bearing 7 is designed in such a way that it allows the deflection of the end of the screw pinion shaft 3 received therein within limits, resulting from a pivoting of the screw pinion shaft 3 .
  • the second pivot bearing 7 also allows axial mobility of the end of the screw pinion shaft 3 received therein relative to the housing 1 within limits.
  • Both the first pivot bearing 6 and the second pivot bearing 7 each comprise a pivot bearing 8, 9 in the form of a ball bearing.
  • a section of the screw pinion shaft 3 is mounted in the inner bearing rings 10 of these pivot bearings 8, 9, while the outer bearing rings 11 of the pivot bearings 8, 9 are each mounted in a bearing device 12, 13 (cf. FIG. 3).
  • the bearing device 12 of the first rotary bearing 6 comprises a bearing sleeve 14 with circular cross-sections, which on the inside accommodates the outer bearing ring 11 of the rotary bearing 8 in a first longitudinal section and an inner ring 16 of a swivel ring 15 in a second longitudinal section.
  • the inner ring 16 of the swivel ring 15 is supported in a rotationally fixed and axially secured manner within the bearing sleeve 14 , inter alia, by the action of a disc-shaped clamping ring 17 , the inner ring 17 being supported on the outer bearing ring 12 of the rotary bearing 8 .
  • the inner ring 16 of the swivel ring 15, loaded on one side by the clamping ring 17, is pressed against one side of the outer bearing ring 11 of the pivot bearing 8, which in turn is pressed on its other side against an axial stop which is bent inwards by a and thereby formed radially aligned end portion of the bearing sleeve 14 is supported.
  • the swivel ring 15 also includes an outer ring 18, which is connected to the inner ring 16 via two torsion bars (not visible).
  • the outer ring 18, the inner ring 16 and the torsion bars are preferably formed in one piece from, for example, spring steel.
  • the torsion bars of swivel ring 15 not only allow the outer ring 18 to swivel relative to the inner ring 16 and thus the screw pinion shaft 3 relative to the gear wheel 2 or to the first housing 1a, but at the same time bring about a spring force that causes the (first) pinion toothing 25 of the fferritzelwelle 3 is pressed into the teeth of the gear 2 in order to achieve the lowest possible gear backlash and thus a low noise level during operation of the steering system, especially in a so-called alternating steering.
  • the pivot bearing 8 of the first pivot bearing 6 is secured in the axial position on the screw pinion shaft 3 with the interposition of a coupling piece 21 by means of a screw 22 which is screwed into an internal thread which is integrated into the drive-side end of the screw pinion shaft 3.
  • the coupling piece 21 is also used to transmit drive power from the steering motor to the screw pinion shaft 3, for which purpose the coupling piece 21 is non-rotatably connected to the screw pinion shaft 3 via teeth and non-rotatably can be connected to an output shaft of the steering motor.
  • the outer ring 18 of the swivel ring 15 is secured in the axial position within the housing 1 by means of an outer retaining ring 23 and an inner retaining ring 24.
  • the gear shaft 4 is by means of a third pivot bearing 28 of the steering system, which is designed as a fixed bearing, within the second housing part 1b and by means a fourth rotary bearing 29 of the steering system, representing a loose bearing, is mounted within the third housing part 1c (cf. FIG. 2).
  • the third pivot bearing 28, which is arranged between the gear wheel 2 and the (second) pinion toothing 26 of the gear shaft 4, comprises a pivot bearing 30 in the form of a ball bearing, with an inner bearing ring 10 of this pivot bearing 30 being mounted on the gear shaft 4 in an axially fixed manner, while an outer bearing ring 11 of the rotary bearing 30 is held in an axially fixed manner on the second housing part 1b.
  • a shoulder of the second housing part 1b or the gear wheel shaft 4 on the one hand and a retaining ring 32 on the other hand are provided.
  • the fourth pivot bearing 29 comprises a pivot bearing 31 in the form of a roller bearing, which is designed in such a way that it allows an axial displacement of the end of the gear shaft 4 received by it relative to the housing 1, whereby different, thermally induced elongations of the gear shaft 4 on the one hand and the housing 1 on the other hand can be compensated.
  • the rotary bearing 31 of the fourth rotary bearing 29 of the gear shaft 4 comprises a plurality of cylindrical rollers which, guided by a roller cage, roll directly on the surface of a bearing section of the gear shaft 4 and on the surface of a bearing section of the third housing section 1c.
  • the rollers can also be accommodated in an outer bearing ring which is arranged in the third housing part 1c.
  • the second housing part 1b is designed as a flange-shaped connecting part and comprises an annular connecting plate 33 and an annular circumferential centering projection 34 on each of the base surfaces of the connecting plate 33.
  • the centering projections 34 each protrude into an open end of the first housing part 1a or the third housing part 1c and make contact the inside of the respective adjoining housing part 1a, 1c.
  • the gap formed between the outside of the centering projections 34 and the inside of the adjoining housing part 1a, 1c is sealed by means of a sealing ring (not shown), which is arranged in a circumferential recess 35 of the respective centering projection 34.
  • the first housing part 1a and the second housing part 1b on the one hand and the second housing part 1b and the third housing part 1c on the other hand are each detachably connected to one another by means of screw connections (not visible).
  • a unit consisting of gear wheel 2, gear wheel shaft 4, third pivot bearing 28 and second housing part 1b is pre-assembled.
  • the second housing part 1b is then connected to either the first housing part 1a or the third housing part 1c, which have also already been preassembled into units with the components stored therein.
  • the second housing part 1b is then connected to the remaining housing part 1a, 1c.
  • the first housing part 1a can be designed with only one housing opening located in the course of the axis of rotation 38 of the gear shaft 4.
  • This housing opening, into which the second housing part 1b is inserted or which is partially closed after assembly by means of the second housing part 1b, is dimensioned so large that the gear wheel 2 can be introduced through it into the first housing part 1a.

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

Abstract

L'invention concerne un système de direction comprenant un boîtier (1) et un arbre de pignon fileté (3) monté rotatif dans une première partie de boîtier (1a) au moyen d'un premier palier rotatif (6) et d'un deuxième palier rotatif (7) et comprenant une première denture de pignon (25). Ce système de direction comprend également une roue dentée (2) qui est disposée de préférence dans la première partie de boîtier (1a), cette roue dentée (2) étant en prise avec la première denture de pignon (25). De plus, un arbre formant pignon (4) est monté dans une deuxième partie de boîtier (1b) au moyen d'un troisième palier rotatif (28), relié solidaire en rotation à la roue dentée (2) et comprenant une deuxième denture de pignon (26), cette deuxième denture de pignon (26) étant en prise avec une partie endentée (36) d'une crémaillère (5) montée de manière à pouvoir être déplacée axialement dans une troisième partie de boîtier (1c). Cette structure de boîtier (1) en trois parties renfermant respectivement au moins un élément de transmission (arbre de pignon fileté (3), roue dentée (2), arbre formant pignon (4) et crémaillère (5)) monté mobile à l'intérieur permet de conférer au système de direction une configuration structurale avantageuse caractérisée en particulier par une fabricabilité et un montage avantageux.
PCT/EP2021/072447 2020-08-20 2021-08-12 Système de direction comprenant trois parties de boîtier et des éléments de transmission montés dans celles-ci WO2022038027A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020210601.0A DE102020210601A1 (de) 2020-08-20 2020-08-20 Lenksystem mit drei Gehäuseteilen und mit darin gelagerten Getriebekomponenten
DE102020210601.0 2020-08-20

Publications (1)

Publication Number Publication Date
WO2022038027A1 true WO2022038027A1 (fr) 2022-02-24

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Family Applications (1)

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PCT/EP2021/072447 WO2022038027A1 (fr) 2020-08-20 2021-08-12 Système de direction comprenant trois parties de boîtier et des éléments de transmission montés dans celles-ci

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Country Link
DE (1) DE102020210601A1 (fr)
WO (1) WO2022038027A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1914430A1 (fr) 2005-07-29 2008-04-23 JTEKT Corporation Procédé et structure pour empêcher une vis de se desserrer et procédé de fabrication d'une vis mâle
DE102013003902A1 (de) * 2012-03-22 2013-09-26 Hitachi Automotive Systems Steering, Ltd. Servolenkungsvorrichtung und Gehäuse für eine elektrische Servolenkungsvorrichtung.
US20160264171A1 (en) * 2015-03-10 2016-09-15 Showa Corporation Housing structure and power steering apparatus
US9527524B2 (en) * 2014-03-27 2016-12-27 Showa Corporation Power steering apparatus and method of assembling same
DE112016002735T5 (de) * 2015-06-17 2018-03-29 Kyb Corporation Lenkvorrichtung
DE102016122644A1 (de) 2016-11-24 2018-05-24 Robert Bosch Gmbh Lenkgetriebe und Lenksystem
WO2020004897A1 (fr) * 2018-06-29 2020-01-02 주식회사 만도 Appareil de direction assistée électronique

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1914430A1 (fr) 2005-07-29 2008-04-23 JTEKT Corporation Procédé et structure pour empêcher une vis de se desserrer et procédé de fabrication d'une vis mâle
DE102013003902A1 (de) * 2012-03-22 2013-09-26 Hitachi Automotive Systems Steering, Ltd. Servolenkungsvorrichtung und Gehäuse für eine elektrische Servolenkungsvorrichtung.
US9527524B2 (en) * 2014-03-27 2016-12-27 Showa Corporation Power steering apparatus and method of assembling same
US20160264171A1 (en) * 2015-03-10 2016-09-15 Showa Corporation Housing structure and power steering apparatus
DE112016002735T5 (de) * 2015-06-17 2018-03-29 Kyb Corporation Lenkvorrichtung
DE102016122644A1 (de) 2016-11-24 2018-05-24 Robert Bosch Gmbh Lenkgetriebe und Lenksystem
WO2020004897A1 (fr) * 2018-06-29 2020-01-02 주식회사 만도 Appareil de direction assistée électronique
US20210261188A1 (en) * 2018-06-29 2021-08-26 Mando Corporation Electronic power steering apparatus

Also Published As

Publication number Publication date
DE102020210601A1 (de) 2022-02-24

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