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
  • B62D5/0409—Electric motor acting on the steering column
• • 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
  • F16H55/22—Toothed members; Worms for transmissions with crossing shafts, especially worms, worm-gears
  • F16H55/24—Special devices for taking up backlash
• • 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
  • F16H57/02—Gearboxes; Mounting gearing therein
  • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
  • F16H2057/0213—Support of worm gear shafts

Definitions

• the invention relates to a steering gear for a steering system and a corresponding steering system, in particular a power steering system, for a motor vehicle.
• the known power steering systems are based on a steering gear that translates the drive power of a hydraulic or electric steering motor and transmits, for example, the steering column.
• Such steering gear can be in the form of a fferablylzgetriebes and in particular as fferradgetriebe or
• Worm gear be formed. These then comprise a gear wheel, which may be directly or indirectly connected to the steering column, as well as an intermeshing, driven by a shaft of the steering motor pinion.
• the pinion shaft is pivotally mounted about an axis which is perpendicular to the longitudinal axis of the pinion shaft and at a distance from the toothing engagement of pinion and gear, and by means of one or more spring elements against the gear is pressed.
• the pivotability of the pinion shaft is thereby regularly integrated in one of the two bearings over which the pinion shaft is mounted end.
• the bearing in the area of the other end is then designed with a defined clearance (so-called "floating bearing", cf., for example, DE 10 2005 035 020 A1) in order to enable the deflection caused by the pivoting movement.
• the camp is regular
• the one or more spring elements for pressing the pinion to the gear can be integrated in both the floating bearing and in the fixed bearing.
• Such a steering gear in which the spring force is generated for the springing by means of the fixed bearing for example, from DE 10 2009 054 655 A1 known.
• this steering gear is provided to store a ball bearing, which receives the pinion shaft in the region of the fixed bearing on the outside in a pivot sleeve.
• Swivel sleeve comprises a bearing sleeve which receives the ball bearing largely free of play, and an outer ring which is held largely free of play in a receptacle of a housing of the steering gear, wherein the outer ring and the bearing sleeve are connected via a plurality of torsion webs, upon rotation of the outer ring to the bearing sleeve be twisted.
• the torsion bars are twisted in such a way that the elastic restoring effect generated thereby causes the springing of the pinion shaft.
• the invention has for its object to improve a steering gear, as it is basically known from DE 10 2009 054 655 A1, in terms of size and thus in terms of the space required for its integration into a motor vehicle space or to reduce.
• This object is achieved by means of a steering gear according to the patent claim 1.
• a steering system with such a steering gear is the subject of claim 10.
• Advantageous embodiments of the steering gear according to the invention and thus also of the steering system according to the invention are objects of the dependent claims and / or emerge from the following description of the invention.
• a steering gear for a steering system of a motor vehicle, which has a housing, a toothed wheel, a pinion meshing with the toothed wheel, in particular a screw pinion, and a (screw) pinion shaft comprising the pinion.
• the pinion shaft is mounted on one side of the pinion in a fixed bearing, which includes a pivot bearing in which the pinion shaft is received.
• the rotary bearing comprises at least one inner bearing ring and an outer bearing ring and optionally, in a preferred embodiment as rolling and in particular ball bearings, a plurality of arranged between the bearing rings rolling elements, in particular balls, wherein the pinion shaft is received within the inner bearing ring of the pivot bearing.
• the pivot bearing and in particular the outer bearing ring of the pivot bearing of the fixed bearing is further accommodated in a bearing sleeve.
• the bearing comprises a pivot ring having an outer ring and an inner ring, which are pivotally connected to each other via one or more torsion bars, wherein the inner ring connected to the bearing sleeve or integral part of this and the outer ring in the housing of the steering gear (with respect to at least one, preferably with respect to all directions, ie
• the pinion shaft of a steering system is mounted on the other side of the pinion in a floating bearing comprising a pivot bearing in which the pinion shaft is received, wherein for the pivot bearing (and thus also for the end of the pinion shaft received therein) a radial mobility within of the housing is granted.
• a pivot bearing and in particular an outer ring thereof in a mounted in the housing
• Bearing bush is added, wherein the bearing bushes a radial mobility of the pivot bearing within the housing ge strictlyreistet.
• a floating bearing can for example have an embodiment according to DE 10 2005 035 020 A1.
• the bearing bush of the floating bearing a the Having a rotary bearing receiving inner sleeve and an inner sleeve surrounding and fixedly disposed in the housing outer sleeve, wherein the outer sleeve and the inner sleeve define an annular gap and wherein the outer sleeve and the inner sleeve are connected to each other via a flexible connecting portion, that they relative to at least one radial direction are movable to each other.
• the pivot bearing of the floating bearing of the steering gear according to the invention comprises at least one inner bearing ring and an outer bearing ring and
• a rolling and in particular as a ball bearing a plurality of arranged between the bearing rings rolling elements, in particular balls, wherein the pinion shaft is received within the inner bearing ring and the outer bearing ring in particular directly within the
• Inner bush of the bearing bush of the floating bearing is added.
• Such a steering system according to the invention is characterized in that the bearing sleeve and / or an outer bearing ring of the pivot bearing of the fixed bearing via a one- or multi-part connecting element directly or indirectly (for example via a bearing bush of the movable bearing, in particular via an inner sleeve of such bearing bush) with an outer Bearing ring of the pivot bearing of the floating bearing is connected.
• the connecting element is designed such that this at least one load, which leads to a tilting of the outer ring of the pivot bearing of the fixed bearing, transmits directly or indirectly to the outer ring of the pivot bearing of the movable bearing.
• the Rotary bearing of the fixed bearing and / or the pivot bearing of the floating bearing to dimension relatively small, which can have a positive effect in terms of size and weight and in terms of manufacturing costs of a steering gear according to the invention.
• a structurally relatively simple ausgestaltetes pivot bearing preferably a single-row radial ball bearings are selected for the fixed bearing and / or the floating bearing, which is also positive in terms of size and weight and in terms of manufacturing cost of the invention
• Steering gear can affect.
• Bearing element is mounted, is thus guided by the pivoting of the pinion shaft. It can defined attacks of the housing a radial
• the connecting element is at least partially rohrformig.
• the connecting element is tubular over its entire length and surrounds the pinion shaft, one (preferably the only one) arranged in the region of the pinion
• Component weight rigid, which allows an advantageous transfer of a swivel load from the bearing sleeve and / or the outer bearing ring of the pivot bearing of the fixed bearing on the floating bearing.
• the connecting element is integral with the bearing sleeve (i.e., at least directly connected to each other) and preferably in one piece (i.e.
• Connecting elements connected to each other is formed.
• Connecting elements connected to each other is formed.
• Steering gear can then be provided that the pivot bearing of the movable bearing within an (end) portion of the connecting element and a (same or another) portion of the connecting element within the bearing bush of the
• Loslagers is stored directly or indirectly. This can in particular lead to a relatively good mountability of such a steering gear according to the invention.
• a steering gear according to the invention in particular a steering gear according to the invention according to the one or the two aforementioned embodiments, may be characterized in that the
• Transmission of a swivel load from the bearing sleeve and / or from the outer bearing ring of the pivot bearing of the fixed bearing can be achieved on the floating bearing.
• An embodiment of the bearing bush made of plastic can be distinguished positively in particular with regard to the noise behavior of the steering gear during operation.
• the connecting element (alternatively or additionally) may be formed integrally, in one piece and / or with the same material as the outer bearing ring of the rotary bearing or with the bearing bush (in particular with an inner bushing preferably provided for the bearing bush).
• the pivot bearing of the fixed bearing is mounted within a portion of the connecting element and a / this portion of the connecting element within the bearing sleeve of the fixed bearing.
• a steering system according to the invention comprises at least one steering gear according to the invention as well as a steering motor connected in rotation with the pinion shaft.
• the gear of the steering gear can also be rotatably or rotationally drivingly connected to a steering shaft, in particular a steering column, the steering system.
• the steering system according to the invention can in particular as a power steering system
• a supporting torque can be generated so that a comprehensive by a driver of a power steering system motor vehicle for steering the motor vehicle on the steering column applied steering torque is reduced (possibly even temporarily to zero) is.
• the steering system in such a way that of the steering motor (always) the entire steering torque required for steering is generated (especially for a so-called steer-by-wire functionality of the steering system or the motor vehicle, in which no mechanical connection between a
• the invention also relates to a motor vehicle with an inventive
• FIG. 1 shows a longitudinal section through an inventive steering gear.
• Fig. 2 the fixed bearing and the integrated therein connecting element of
• Fig. 4 the bearing bush of the movable bearing of the steering gear according to FIG. 1 in a
• Fig. 1 shows the essential components of an inventive
• Steering gear This comprises a housing 1, within which a gear 2 and a meshing with the gear 2 pinion 3 are rotatably arranged in the form of a fferritzels.
• the pinion 3 and the pinion 3 comprehensive (screw) pinion shaft 4 are integrally formed in the form of a worm.
• the gear 2 is fixedly mounted on an output shaft 5 (see Fig. 1) of the steering gear.
• This output shaft 5 which in the illustrated embodiment a Toothing for a secure rotationally fixed connection with the gear 2, for example, with a trained at least in a section as a rack handlebar, whereby the rack performs a translational movement in a known manner via Radlenkhebel (not shown) in a
• Pivoting movement of steerable wheels (not shown) of the motor vehicle can be translated.
• the output shaft 5 may also be a steering column of a power steering system, which is connected to a steering wheel and acts via a steering pinion on the handlebar.
• the pinion shaft 4 has a drive-side end over which this with the
• Output shaft of a steering motor (not shown, for example, an electric motor) is connectable.
• the pinion shaft 4 is mounted in the housing 1 by means of a first bearing.
• This bearing is designed as a fixed bearing 6, which allows a pivoting of the pinion shaft 4 about a pivot axis 7 (see Fig. 2).
• This pivoting causes a deflection of the drive-side end opposite end of the pinion shaft 4, which is mounted there by means of a movable bearing 8 in a corresponding receptacle of the housing 1.
• This floating bearing 8 is designed so that it allows the resulting from the pivoting of the pinion shaft 4 deflection of this end.
• Both the fixed bearing 6 and the floating bearing 8 each comprise a pivot bearing in the form of a ball bearing 9.
• inner bearing rings 10 of these ball bearings 9 the corresponding portions of the pinion shaft 4 are supported, while outer bearing rings 1 1 of the ball bearing 9 in each case a bearing device 12, 13th are stored, which in turn are received in corresponding receptacles of the housing 1.
• Bearing devices 12, 13 are structurally designed so that they allow in the case of the fixed bearing 6, the pivoting of the pinion shaft 4 about the pivot axis 7 and in the case of the movable bearing 8, the deflection of the free end of the pinion shaft 4.
• the bearing device 12 of the fixed bearing 6 comprises a bearing sleeve 14 with nikringförmigem cross section, the inner side in a first longitudinal section, the associated ball bearing 9 and in a second longitudinal section receives an inner ring 16 of a pivot ring 15.
• This inner ring 16 of the pivot ring 15 is rotationally fixed and axially secured within the bearing sleeve 14 with the interposition of a support plate 17, wherein the inner ring 16 is supported on the outer bearing ring 1 1 of the ball bearing 9 of the fixed bearing 6.
• the swivel ring 15 comprises, in addition to the inner ring 16, an outer ring 18.
• the outer ring 18 is provided with two torsion bars 19 (see Fig. 2) connected to the inner ring 16.
• the outer ring 18, the inner ring 16 and the torsion bars 19 are preferably formed integrally from, for example, spring steel.
• the two torsion bars 19 define the position of the pivot axis 7 about which the outer ring 18 is pivotable relative to the inner ring 16 of the pivot ring 15.
• the torsion bars 19 and thus the pivot axis 7 do not run through the center of the pivot ring 15 and thus not through the center of the cross section of the pinion shaft 4, but radially offset thereto (see Fig .. 2).
• the pivot axis 7 thus does not intersect the longitudinal axis 23 of the pinion shaft 4.
• the radial displacement of the torsion bars 19 to the center of the pivot ring 15, the pivot axis 7 is displaced in the vicinity of the outer periphery of the pinion shaft 4, whereby the formation of reaction moments arising as a result of Tooth engagement of pinion gear 3 and 2 resulting toothing forces in conjunction with the distance of the line of action of these teeth forces of the pivot axis 7 would result or would be reduced or avoided.
• the pivot axis 7 is within that tangential plane, which in the
• the torsion bars 19 of the pivot ring 15 not only allow pivoting of the outer ring 18 to the inner ring 16 and thus the pinion shaft 4 relative to the gear 2 and the housing 1, but at the same time cause the spring force by which the pinion 3 of the pinion shaft 4 in the Tooth of the gear 2 is pressed in order to achieve the lowest possible backlash and thus a low noise during operation of the steering gear, in particular in a so-called Komlenken.
• This spring force results from the fact that during assembly of the steering gear, the pinion shaft 4 so far as a result of contact with the gear 2 is deflected that sufficient torsion of the
• Torsionsstege 19 results, whereby the elastic restoring moments, resulting from the torsion of the torsion bars 19, counteract this deflection of the pinion shaft 4 and thus act against the gear 2.
• the bearing device 13 of the floating bearing 8 is designed in the form of a bearing bush 13, which comprises an inner bush 24 which is arranged as concentrically as possible within an outer bushing 25 in an unloaded neutral position of the bearing bush 13 (see FIG. In one section, the inner sleeve 24 is over a
• Connecting portion 26 connected to the outer sleeve 25. In the area of
• the inner sleeve 24 and the outer sleeve 25 are surrounded by an elastomer shell 30.
• the design of the elastomeric sheath 30 is such that it does not project beyond the outer surfaces of the inner sleeve 24 and the outer sleeve 25.
• the axial length of the inner sleeve 24 and the outer sleeve 25 in the projections 27, 28 forming peripheral portions smaller than in the other peripheral portions. As a result, recesses (not visible) are formed, in which the elastic material of the elastomer shell 30 is received.
• the inner bush 24 on its inner side and the outer bush 25 on its outer side in each case a further, extending in the axial direction recess 31, 32, wherein the material of the elastomer shell 30 is also received in these recesses 31, 32. Also in the region of the annular gap 29, the projections 27, 28 on both sides (in the circumferential direction) surrounded by the elastic material of the elastomer shell 30 and embedded in these.
• the elastomer shell 30 ensures the cohesion of the inner sleeve 24 and the
• the connecting portion 26 forms one
• Swivel joint with a low pivoting moment which pivoting of the outer sleeve 25 to the inner sleeve 24 by a in the range of
• Connecting portion 26 lying pivot axis allows.
• the bearing bush 13 is integrated into the housing 1 of the steering gear, that the pivoting of the pinion shaft 4 about the defined by the fixed bearing 6 pivot axis 7 leads to a displacement of the inner sleeve 24 relative to the outer sleeve 25 in a direction in the Is substantially perpendicular to the leading through the connecting portion 26 radial axis 33.
• displacement of the inner bushing 24 relative to the outer bushing 25 should be possible in order to avoid entanglement of the pinion 3 on the gearwheel 2 during operation of the steering gear. This is achieved in that the distance between the inner sleeve 24 and the
• a relatively small amount of e.g. 0.1 mm is limited.
• the limiting element 34 has a radial width which is greater than the radial width of the outer bushing 25, wherein the limiting element 34 of the bearing bush 13 not yet mounted in the housing 1 can be displaced outwardly so far that it projects beyond the outer surface of the outer bushing 25. This results in a relatively large distance between the outside of the inner sleeve 24 and the
• Limiting element 34 which allows a relatively simple mounting of the bearing bush 13. This distance is reduced in the context of the assembly of the floating bearing 8 in the housing 1 to the desired small size, since then the
• Inner bush 24 must be moved.
• the outer sleeve 25 of the bushing 13 further includes an elastic stop member 35, which is a movement of the inner sleeve 24 at a
• the steering gear still further comprises a connecting element 36 which is integrated into the bearing sleeve 14 of the fixed bearing 6 (in one piece and of the same material) or designed as an extension thereof.
• the extension element 36 is tubular with
• Connecting element 36 is arranged and extends over a portion of the circumference. Through this jacket opening 37, a portion of the gear 2 in the bounded by the connecting element 36 and the pinion shaft 4 in the u.a. the pinion 3 forming portion projecting inner volume protrude to allow engagement of the gear 2 with the pinion 3.
• a (tubular) end portion of the connecting element 36 extends into the floating bearing 8 of the steering gear, wherein the ball bearing 9 of the movable bearing 8 with the associated outer bearing ring 1 1 within this end portion of
• Connecting element 36 is mounted, while the end portion is in turn mounted inside in the inner sleeve 24 of the bearing bush 13 of the movable bearing 8.
• this ball bearing 9 is not with a

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Transportation (AREA)
• Gear Transmission (AREA)
• Power Steering Mechanism (AREA)
• Support Of The Bearing (AREA)
• Steering Controls (AREA)
• Rolling Contact Bearings (AREA)
• Gears, Cams (AREA)
• Mounting Of Bearings Or Others (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=60164655

Family Applications (1)

Country Status (6)

Families Citing this family (6)

Family Cites Families (21)

• 2016
  • 2016-11-24 DE DE102016122644.0A patent/DE102016122644A1/de active Pending
• 2017
  • 2017-10-06 EP EP17788140.6A patent/EP3544878A1/de not_active Withdrawn
  • 2017-10-06 WO PCT/EP2017/075517 patent/WO2018095639A1/de unknown
  • 2017-10-06 US US16/463,590 patent/US20190315389A1/en active Pending
  • 2017-10-06 JP JP2019527878A patent/JP6887498B2/ja active Active
  • 2017-10-06 CN CN201780072610.4A patent/CN109963770B/zh active Active

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