WO2003062011A1 - Entrainement de reglage - Google Patents

Entrainement de reglage Download PDF

Info

Publication number
WO2003062011A1
WO2003062011A1 PCT/DE2002/003634 DE0203634W WO03062011A1 WO 2003062011 A1 WO2003062011 A1 WO 2003062011A1 DE 0203634 W DE0203634 W DE 0203634W WO 03062011 A1 WO03062011 A1 WO 03062011A1
Authority
WO
WIPO (PCT)
Prior art keywords
bearing element
spindle
axial bearing
drive according
adjustment drive
Prior art date
Application number
PCT/DE2002/003634
Other languages
German (de)
English (en)
Inventor
Manfred Winter
Willi Schmidt
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 WO2003062011A1 publication Critical patent/WO2003062011A1/fr

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/90—Details or parts not otherwise provided for
    • B60N2/919—Positioning and locking mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/0224—Non-manual adjustments, e.g. with electrical operation
    • B60N2/02246—Electric motors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/0224—Non-manual adjustments, e.g. with electrical operation
    • B60N2/02246—Electric motors therefor
    • B60N2/02253—Electric motors therefor characterised by the transmission between the electric motor and the seat or seat parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
    • B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
    • B62D1/16—Steering columns
    • B62D1/18—Steering columns yieldable or adjustable, e.g. tiltable
    • B62D1/181—Steering columns yieldable or adjustable, e.g. tiltable with power actuated adjustment, e.g. with position memory
    • 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
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
    • F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
    • F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel

Definitions

  • the invention relates to an adjusting drive, in particular for a seat adjustment or a power steering system according to the preamble of the main claim.
  • EP 0 759 374 A2 discloses a device for adjusting a seat in a motor vehicle, in which a threaded spindle is driven by an electric motor via a worm gear.
  • the armature shaft of the motor which is designed as a worm shaft, meshes with a worm wheel which is arranged in a rotationally fixed manner on the threaded spindle.
  • the threaded spindle is rotatably guided on one side in a threaded nut which is connected to a component fixed to the frame.
  • a curved bearing surface is formed on the other end of the threaded spindle, which is supported on a stop surface in the gear housing.
  • this axial bearing surface with the threaded spindle is very complex and cost-intensive, since it must have a high surface quality with great dimensional accuracy.
  • axial bearing surfaces are known which are made of plastic, for example in one piece with the worm wheel formed on the threaded shaft.
  • the use of plastic has the disadvantage of excessive wear and high frictional forces.
  • the adjusting drive according to the invention with the features of the main claim has the advantage that the spindle is mounted directly on a metal bearing element without the need for expensive machining of the free end of the spindle. This ensures high wear resistance and low bearing friction, and the bearing surface can be produced simply and inexpensively due to the separately manufactured bearing element.
  • the bearing element is particularly favorable to arrange the bearing element as an insert in an injection mold before the driven gear is molded onto the spindle by the injection molding process.
  • the bearing element is integrally formed with the driven gear in one operation, whereby very small tolerances for the arrangement of the bearing surface can be achieved in this way.
  • the bearing element is fixed in the cooled state of the device by shrinking the plastic component with a high force, so that the bearing element is prevented from moving twisted or shifted in the plastic component. It is advantageous if the plastic component is part of the driven gear, since then the bearing element is molded on simultaneously with the driven gear.
  • the bearing element is supported on a thrust washer which is arranged on the gear housing, the bearing forces which occur are dissipated via the gear housing.
  • the bearing element is particularly simple to manufacture the bearing element as a ball, as used, for example, in conventional ball bearings.
  • the spherical bearing surface minimizes friction to the thrust washer, which means that the adjustment drive has lower losses.
  • the axial bearing can absorb a high surface pressure.
  • steel has a low coefficient of thermal expansion, which means that the bearing element is fixed even more firmly when molded.
  • Bearing element hardened which can be carried out in a simple manner before assembly by the separate design of the bearing element.
  • the associated reduction in axial play leads to less noise when changing the direction of rotation.
  • bearing elements have a diameter between 3 and 7 mm, this represents a good compromise in order to limit the surface pressure on the one hand and the friction of the contact surface on the other hand. With a diameter of about 5 mm, these two sizes are in a particularly favorable ratio to each other.
  • the largest part of the bearing element is radially enclosed by the plastic component, and a part of the bearing element protrudes beyond the plastic component in order to form the actual bearing surface. If the protrusion of the bearing element is between a fifth and a twentieth of its diameter, the bearing element is still securely fixed on the one hand by means of the plastic component, on the other hand the protrusion is large enough to allow a certain abrasion or a slight tilting of the spindle.
  • Figure 1 shows an embodiment of a
  • FIG. 1 shows an adjustment drive according to the invention, in which an electric motor 12 drives a spindle 16 via an armature shaft designed as a worm 14.
  • a driven wheel 28 designed as a worm wheel 26 is arranged on the spindle, which is made of plastic and injection-molded onto a structure 34 formed on the spindle 16 by means of injection molding.
  • the worm 14 and the driven wheel 28 form a worm gear which is enclosed by a gear housing 18.
  • the spindle 16 is mounted at one end 22 in the gear housing 18 and protrudes therefrom, the projecting part 24 of the spindle 16 for example, combs with a threaded nut, not shown, which is fixedly attached to a component, thereby allowing a relative movement relative to a seat part to which the gear housing 18 is attached.
  • a bearing element 32 which is designed as a steel ball, is arranged directly on the end face 30 of the spindle 16.
  • the bearing element 32 is radially enclosed by a plastic component 36, which is formed in one piece with the driven wheel 28.
  • the bearing element 32 was inserted into an injection mold with the spindle 16 prior to the shaping of the driven wheel 28 and overmoulded in one process step with the injection molding of the driven wheel 28 and thus fixed locally. Since the steel ball 32 hardly expands during the injection molding process, but the plastic shrinks when it cools down after spraying, the steel ball 32 is reliably against
  • the steel ball 32 is preferably hardened before the encapsulation in order to achieve a bearing surface of great hardness.
  • the bearing surface 38 is supported against a flat thrust washer 40, which is formed as part of the gear housing 18 in the exemplary embodiment.
  • the spherical bearing surface 38 of the steel ball 32 has only a small contact point with respect to the thrust washer 40, as a result of which friction losses are reduced.
  • the thrust washer 40 has a recess into which the bearing element 32 engages. This also ensures radial guidance of the spindle 16 to a certain extent.
  • the steel ball 32 has a diameter 42 of approximately 5 mm.
  • the diameter 42 determines the effective bearing surface, whereby on the one hand the friction losses and on the other hand the surface pressure of the axial bearing can be specified. Therefore, depending on the requirement, the diameter 42 of the steel ball 32 can also be in the range between 3 and 7 mm.
  • the distance 44 between the plastic component 36 and the thrust washer 40 is determined by the protrusion 46 with which the bearing element 32 protrudes axially over the plastic component 36.
  • the protrusion 46 of the bearing element 32 allows a certain abrasion on the same or on the thrust washer 40 and enables the spindle 16 to tilt slightly axially. In the exemplary embodiment, the protrusion 46 is approximately one
  • the driven wheel 28 has guide surfaces 48 which are supported on stops 50 of the gear housing 18.
  • the plastic component 36 is designed as a separate part, but it can also be attached to the output gear in one operation
  • the bearing element 32 can also assume a shape deviating from a ball on the end face 30 or on its radial circumference, e.g. a cylinder with a spherical bearing surface formed toward the thrust washer 40 is conceivable. It can also
  • Thrust washer 40 may be formed as a separate component, which is supported on the gear housing 18.
  • the material of the bearing element 32 can also be another material that preferably has a similar or better surface hardness than steel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Gear Transmission (AREA)
  • Mounting Of Bearings Or Others (AREA)

Abstract

L'invention concerne un entraînement de réglage, notamment pour le réglage d'un siège ou d'une direction assistée, cet entraînement comprenant un carter de protection (18) et une roue de sortie (28) entraînée par un moteur et montée solidaire en rotation sur une broche (16). L'invention est caractérisée en ce qu'à l'extrémité (22) de la broche (16) est disposé séparément mais directement dans l'axe un élément de palier (32) en métal. Cet élément est radialement directement entouré d'un élément en plastique (36), lequel est solidaire en rotation avec la broche (16).
PCT/DE2002/003634 2002-01-23 2002-09-26 Entrainement de reglage WO2003062011A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20200928U DE20200928U1 (de) 2002-01-23 2002-01-23 Verstellantrieb
DE20200928.9 2002-01-23

Publications (1)

Publication Number Publication Date
WO2003062011A1 true WO2003062011A1 (fr) 2003-07-31

Family

ID=7966845

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2002/003634 WO2003062011A1 (fr) 2002-01-23 2002-09-26 Entrainement de reglage

Country Status (2)

Country Link
DE (1) DE20200928U1 (fr)
WO (1) WO2003062011A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1882577A1 (fr) * 2006-07-26 2008-01-30 SITI S.p.A. Moteur à engrenages et son procédé de fabrication

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010007785A1 (de) * 2010-02-12 2011-08-18 MAHLE International GmbH, 70376 Antriebsvorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1059313A (en) * 1908-02-10 1913-04-15 American Wood Working Machinery Co Step-bearing for machinery.
EP0759374A2 (fr) * 1995-08-18 1997-02-26 Robert Bosch Gmbh Dispositif pour régler des sièges de véhicules automobiles
DE19545786A1 (de) * 1995-12-08 1997-06-12 Fritz Stahlecker Offenend-Spinnrotor
EP0868009A1 (fr) * 1997-03-25 1998-09-30 Robert Bosch Gmbh Ensemble d'un moteur électriqu et d'un engrenage à vis sans fin
EP1223073A2 (fr) * 2000-12-19 2002-07-17 Robert Bosch Gmbh Unité transmission-entraínement pour le réglage d'un siège ou une direction assistée, avec au moins un élément de support

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1059313A (en) * 1908-02-10 1913-04-15 American Wood Working Machinery Co Step-bearing for machinery.
EP0759374A2 (fr) * 1995-08-18 1997-02-26 Robert Bosch Gmbh Dispositif pour régler des sièges de véhicules automobiles
DE19545786A1 (de) * 1995-12-08 1997-06-12 Fritz Stahlecker Offenend-Spinnrotor
EP0868009A1 (fr) * 1997-03-25 1998-09-30 Robert Bosch Gmbh Ensemble d'un moteur électriqu et d'un engrenage à vis sans fin
EP1223073A2 (fr) * 2000-12-19 2002-07-17 Robert Bosch Gmbh Unité transmission-entraínement pour le réglage d'un siège ou une direction assistée, avec au moins un élément de support

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1882577A1 (fr) * 2006-07-26 2008-01-30 SITI S.p.A. Moteur à engrenages et son procédé de fabrication

Also Published As

Publication number Publication date
DE20200928U1 (de) 2003-06-05

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