WO2003062011A1 - Adjusting drive - Google Patents

Adjusting drive Download PDF

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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
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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)
French (fr)
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/en

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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.

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  • 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

The invention relates to an adjusting drive, in particular for adjusting a seat or a power-assisted steering system. Said drive comprises a drive housing (18) and a motor-driven output gear (28), which is located on a spindle (16) in a rotationally fixed manner. According to the invention, an axial metal bearing element (32), which is configured as a separate part, positioned directly on the axis, is disposed (22) on the end of the spindle (16). Said element is immediately surrounded by a plastic component (36), which is connected in a rotationally fixed manner to the spindle (16).

Description

VerStellantriebadjustment drive
Stand der TechnikState of the art
Die Erfindung betrifft einen VerStellantrieb, insbesondere für eine Sitzverstellung oder eine Servolenkung nach der Gattung des Hauptanspruchs .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.
Mit der EP 0 759 374 A2 ist eine Vorrichtung zum Verstellen eines Sitzes im Kraftfahrzeug bekannt geworden, bei dem eine Gewindespindel elektromotorisch über ein Schneckengetriebe angetrieben wird. Dabei kämmt die als Schneckenwelle ausgebildete Ankerwelle des Motors mit einem Schneckenrad, das drehfest auf der Gewindespindel angeordnet ist. Die Gewindespindel ist auf der einen Seite in einer Gewindemutter drehbar geführt, die mit einem gestellfesten Bauteil verbunden ist. Zur axialen Lagerung der Gewindespindel im Bereich des Getriebegehäuses ist am anderen Ende der Gewindespindel eine gewölbte Lagerfläche angeformt, die sich an einer Anschlagfläche im Getriebegehäuse abstützt. Die einstückige Ausbildung dieser axialen Lageroberfläche mit der Gewindespindel ist sehr aufwendig und kostenintensiv, da diese eine hohe Oberflächenqualität mit einer großen Maßgenauigkeit aufweisen muß. Des weiteren sind axiale Lagerflächen bekannt, die aus Kunststoff, beispielsweise einstückig mit dem auf der Gewindewelle angeformten Schneckenrad, ausgebildet sind. Die Verwendung von Kunststoff hat jedoch den Nachteil eines starken Verschleißes und hoher Reibungskräfte.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. For the axial mounting of the threaded spindle in the area of the gear housing, 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. The one-piece design of 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. Furthermore, axial bearing surfaces are known which are made of plastic, for example in one piece with the worm wheel formed on the threaded shaft. However, the use of plastic has the disadvantage of excessive wear and high frictional forces.
Vorteile der ErfindungAdvantages of the invention
Der erfindungsgemäße Versteilantrieb mit den Merkmalen des Hauptanspruchs hat den Vorteil, daß die Spindel direkt über ein Lagerelement aus Metall gelagert ist, ohne daß hierfür eine aufwendige spanende Bearbeitung des freien Endes der Spindel notwendig ist. Dadurch ist eine hohe Verschleißbeständigkeit und eine geringe Lagerreibung gewährleistet, wobei die Lagerfläche aufgrund des separat gefertigten Lagerelements einfach und kostengünstig hergestellt werden kann.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.
Besonders günstig ist es, das Lagerelement als Einlegeteil in eine Spritzgußform anzuordnen, bevor das Abtriebsrad im Spritzgußverfahren auf die Spindel geformt wird. Hierbei wird das Lagerelement in einem Arbeitsgang mit dem Abtriebsrad angeformt, wobei auf diese Weise sehr geringe Toleranzen für die Anordnung der Lagerfläche erzielt werden können.It 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. Here, 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.
Wird für die Anformung des Kunststoff-Bauteils ein Kunststoff verwendet, der beim Abkühlen sein Volumen verringert, so ist das Lagerelement im abgekühlten Zustand der Vorrichtung durch das Schrumpfen des Kunststoff-Bauteils mit einer hohen Kraft fixiert, so daß verhindert wird, daß sich das Lagerelement im Kunststoff-Bauteil verdreht oder verschieb . Vorteilhaft ist es, wenn das Kunststoff-Bauteil ein Teil des Abtriebsrads ist, da dann das Lagerelement gleichzeitig mit dem Abtriebsrad angeformt wird.If a plastic is used for the molding of the plastic component, which reduces its volume when it cools down, 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.
Stützt sich das Lagerelement an einer Anlaufscheibe ab, die am Getriebegehäuse angeordnet ist, werden die auftretenden Lagerkräfte über das Getriebegehäuse abgeleitet. Bei der Ausführung der AnlaufScheibe als Teil einerIf 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. When designing the thrust washer as part of a
Getriebegehäusewand sind keine zusätzlichen Bauteile für die axiale Lagerung notwendig.No additional components for the axial bearing are necessary for the gearbox housing wall.
Besonders einfach ist die Herstellung des Lagerelements als Kugel, wie sie beispielsweise in üblichen Kugellagern verwendet werden. Durch die kugelförmige Lagerfläche wird die Reibung zur AnlaufScheibe minimiert, wodurch der Verstellantrieb geringere Verluste aufweist.It 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.
Wird als Werkstoff für das Lagerelement - insbesondere für die Kugel - Stahl verwendet, kann das Axiallager eine hohe Flächenpressung aufnehmen. Außerdem hat Stahl einen geringen Wärmeausdehnungskoeffizienten, wodurch das Lagerelement beim Umspritzen umso fester fixiert wird.If steel is used as the material for the bearing element - in particular for the ball - the axial bearing can absorb a high surface pressure. In addition, steel has a low coefficient of thermal expansion, which means that the bearing element is fixed even more firmly when molded.
Um die Verschleißfestigkeit und damit die Lebensdauer des VerStellantriebs zu erhöhen, wird die Oberfläche desIn order to increase the wear resistance and thus the service life of the adjustment drive, the surface of the
Lagerelements gehärtet, was durch die separate Ausbildung des Lagerelements in einfacher Weise vor dessen Montage durchgeführt werden kann. Die damit verbundene Reduzierung des Axialspiels führt zu einer geringeren Geräuschbildung beim Umschalten der Drehrichtung.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.
Weisen die Lagerelemente einen Durchmesser zwischen 3 und 7 mm auf, stellt dies einen guten Kompromiß dar, um einerseits die Flächenpressung und andererseits die Reibung der Anlauffläche zu begrenzen. Bei einem Durchmesser von etwa 5 mm liegen diese beiden Größen in einem besonders günstigen Verhältnis zueinander.If the 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.
Der größte Teil des Lagerelements ist radial vom Kunststoff- Bauteil umschlossen, ein Teil des Lagerelements steht über das Kunststoff-Bauteil über, um die eigentliche Lagerfläche zu bilden. Beträgt der Überstand des Lagerelements in etwa zwischen einem Fünftel und einem Zwanzigstel seines Durchmessers, so wird das Lagerelement einerseits mittels des Kunststoff-Bauteils noch sicher fixiert, andererseits ist der Überstand groß genug, um einen gewissen Abrieb oder ein leichtes Verkippen der Spindel zuzulassen.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.
Zeichnungdrawing
In der Zeichnung ist ein Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung dargestellt und in der nachfolgenden Beschreibung näher erläutert .In the drawing, an embodiment of a device according to the invention is shown and explained in more detail in the following description.
Figur 1 zeigt ein Ausführungsbeispiel einerFigure 1 shows an embodiment of a
Sitzverstellvorrichtung mit einem Spindelantrieb.Seat adjustment device with a spindle drive.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Das in Figur 1 dargestellte Ausführungsbeispiel zeigt einen erfindungsgemäßen Verstellantrieb, bei dem ein Elektromotor 12 über eine als Schnecke 14 ausgeformte Ankerwelle eine Spindel 16 antreibt. Dazu ist auf der Spindel ein als Schneckenrad 26 ausgeführtes Abtriebsrad 28 angeordnet, das aus Kunststoff gefertigt und mittels Spritzgußverfahren über eine an der Spindel 16 angeformte Struktur 34 aufgespritzt ist. Die Schnecke 14 und das Abtriebsrad 28 bilden ein Schneckengetriebe, das von einem Getriebegehäuse 18 umschlossen ist. Die Spindel 16 ist an ihrem einen Ende 22 im Getriebegehäuse 18 gelagert und ragt aus diesem heraus, wobei der herausragende Teil 24 der Spindel 16 beispielsweise mit einer nicht dargestellten Gewindemutter kämmt, die fest an einem Bauteil fixiert ist, und dadurch eine Relativbewegung gegenüber einem Sitzteil ermöglicht, an dem das Getriebegehäuse 18 befestigt ist. An der Stirnseite 30 der Spindel 16 ist unmittelbar ein Lagerelement 32 angeordnet, das als Stahlkugel ausgebildet ist. Das Lagerelement 32 ist radial von einem Kunststoff-Bauteil 36 umschlossen, das einteilig mit dem Abtriebsrad 28 ausgebildet ist. Das Lagerelement 32 wurde vor dem Anformen des Abtriebsrads 28 mit der Spindel 16 in eine Spritzgußform eingelegt und in einem Verfahrensschritt mit dem Anspritzen des Abtriebsrads 28 umspritzt und damit örtlich fixiert. Da sich die Stahlkugel 32 beim Spritzgußverfahren kaum ausdehnt, der Kunststoff beim Abkühlen nach dem Spritzen jedoch schrumpft, ist die Stahlkugel 32 zuverlässig gegenThe exemplary embodiment shown in 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. For this purpose, 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
Verdrehen und Verschieben gesichert. Die Stahlkugel 32 wird vorzugsweise vor dem Umspritzen gehärtet, um eine Lageroberfläche großer Härte zu erzielen. Die Lageroberfläche 38 stützt sich gegen eine ebene Anlaufscheibe 40 ab, die im Ausführungsbeispiel als Teil des Getriebegehäuses 18 ausgebildet ist. Die kugelförmige Lageroberfläche 38 der Stahlkugel 32 hat nur einen kleinen Auflagepunkt gegenüber der Anlaufscheibe 40, wodurch Reibungsverluste verringert werden. In einer alternativen Ausführung weist die Anlaufscheibe 40 eine Vertiefung auf, in die das Lagerelement 32 eingreift. Dadurch ist zu einem gewissen Grad auch eine radiale Führung der Spindel 16 gewährleistet. Im Ausführungsbeispiel hat die Stahlkugel 32 einen Durchmesser 42 von etwa 5 mm. Der Durchmesser 42 bestimmt die wirksame Lagerfläche, wodurch einerseits die Reibungsverluste und andererseits die Flächenpressung der Axiallagerung vorgegeben werden können. Daher kann je nach Anforderung der Durchmesser 42 der Stahlkugel 32 auch im Bereich zwischen 3 und 7 mm liegen. Der Abstand 44 zwischen dem Kunststoff-Bauteil 36 und der Anlaufscheibe 40 wird durch den Überstand 46 bestimmt, mit dem das Lagerelement 32 über das Kunststoff-Bauteil 36 axial übersteht. Der Überstand 46 des Lagerelements 32 erlaubt einen gewissen Abrieb an demselben oder an der Anlaufscheibe 40 und ermöglicht ein leichtes axiales Verkippen der Spindel 16. Im Ausführungsbeispiel beträgt der Überstand 46 in etwa einTwisted and moved secured. 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. In an alternative embodiment, 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. In the exemplary embodiment, 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
Sechstel bis ein Achtel des Durchmessers 42, kann für andere Anforderungen aber auch im Bereich zwischen einem Fünftel und einem Zwanzigstel liegen. Zur weiteren axialen und radialen Lagerung der Spindel 16 weist das Abtriebsrad 28 Führungsflächen 48 auf, die sich an Anschlägen 50 des Getriebegehäuses 18 abstützen.Sixth to one eighth of the diameter 42, but can also be in the range between one fifth and one twentieth for other requirements. For further axial and radial mounting of the spindle 16, the driven wheel 28 has guide surfaces 48 which are supported on stops 50 of the gear housing 18.
In einer Variation des Ausführungsbeispiels ist das Kunststoff-Bauteil 36 als separates Teil ausgeführt, das aber auch in einem Arbeitsgang mit dem Abtriebsrad an dieIn a variation of the exemplary embodiment, the plastic component 36 is designed as a separate part, but it can also be attached to the output gear in one operation
Spindel 16 angespritzt werden kann. Das Lagerelement 32 kann zur Stirnseite 30 oder an seinem radialen Umfang auch eine von einer Kugel abweichende Form annehmen, so ist z.B. ein Zylinder mit einer zur Anlaufscheibe 40 hin ausgeformten kugelförmigen Lagerfläche denkbar. Auch kann dieSpindle 16 can be injected. 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
Anlaufscheibe 40 als separates Bauteil ausgeformt sein, das sich am Getriebegehäuse 18 abstützt. Als Werkstoff des Lagerelements 32 kann alternativ zum Stahl auch ein anderes Material verwendet werden, das vorzugsweise eine ähnliche oder bessere Oberflächenhärte als Stahl aufweist. Thrust washer 40 may be formed as a separate component, which is supported on the gear housing 18. As an alternative to steel, the material of the bearing element 32 can also be another material that preferably has a similar or better surface hardness than steel.

Claims

Ansprüche Expectations
1. Verstellantrieb, insbesondere für eine Sitzverstellung oder eine Servolenkung, mit einem Getriebegehäuse (18) und einem auf einer Spindel (16) drehfest angeordneten, motorisch angetriebenen Abtriebsrad (28) , dadurch gekennzeichnet, daß am Ende (22) der Spindel (16) axial direkt ein separat ausgebildetes, axiales Lagerelement (32) aus Metall angeordnet ist, das radial direkt von einem Kunststoff-Bauteil (36) umschlossen ist, das drehfest mit der Spindel (16) verbunden ist.1. Adjustment drive, in particular for a seat adjustment or a power steering, with a gear housing (18) and a motor-driven driven wheel (28) arranged in a rotationally fixed manner on a spindle (16), characterized in that at the end (22) of the spindle (16) axially, a separately formed, axial bearing element (32) made of metal is arranged, which is radially directly surrounded by a plastic component (36) which is connected to the spindle (16) in a rotationally fixed manner.
2. Verstellantrieb nach Anspruch 1, dadurch gekennzeichnet, daß das axiale Lagerelement (32) als ein Einlegeteil mittels Spritzgußverfahren umspritzt ist.2. Adjustment drive according to claim 1, characterized in that the axial bearing element (32) is molded as an insert by means of injection molding.
3. Verstellantrieb nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß das axiale Lagerelement (32) dreh- und verschiebefest, insbesondere mittels Schrumpfen des Kunststoff-Bauteils (36) fixiert ist.3. Adjustment drive according to one of claims 1 or 2, characterized in that the axial bearing element (32) is rotationally and displaceably fixed, in particular by means of shrinking the plastic component (36).
4. Verstellantrieb nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß das Kunststoff-Bauteil (36) ein Teil des Abtriebsrads (28) ist.4. Adjustment drive according to one of the preceding claims, characterized in that the plastic component (36) is part of the driven wheel (28).
5. Verstellantrieb nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß sich das axiale Lagerelement (32) gegen eine Anlaufscheibe (40) abstützt, die am Getriebegehäuse (18) angeordnet ist, insbesondere als Teil einer Getriebegehäusewand ausgebildet ist.5. Adjustment drive according to one of the preceding claims, characterized in that the axial bearing element (32) against a thrust washer (40), which is arranged on the gear housing (18), in particular is designed as part of a gear housing wall.
6. Verstellantrieb nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß das axiale Lagerelement (32) in etwa kugelförmig ausgebildet ist.6. Adjustment drive according to one of the preceding claims, characterized in that the axial bearing element (32) is approximately spherical.
7. Verstellantrieb nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß das axiale Lagerelement (32) aus Stahl gefertigt ist.7. Adjustment drive according to one of the preceding claims, characterized in that the axial bearing element (32) is made of steel.
8. Verstellantrieb nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß das axiale Lagerelement (32) eine mittels Härten erzeugte, harte Oberfläche aufweist.8. Adjustment drive according to one of the preceding claims, characterized in that the axial bearing element (32) has a hard surface produced by hardening.
9. Verstellantrieb nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß das axiale Lagerelement (32) einen Durchmesser (42) im Bereich zwischen 3 und 7 mm, insbesondere von etwa 5 mm, aufweist.9. Adjusting drive according to one of the preceding claims, characterized in that the axial bearing element (32) has a diameter (42) in the range between 3 and 7 mm, in particular of about 5 mm.
10.Verstellantrieb nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß das axiale Lagerelement (32) um etwa ein Fünftel bis ein Zwanzigstel seines Durchmessers (42) axial über das Kunststoff-Bauteil (36) ragt. 10.Adjusting drive according to one of the preceding claims, characterized in that the axial bearing element (32) projects axially over the plastic component (36) by approximately one fifth to one twentieth of its diameter (42).
PCT/DE2002/003634 2002-01-23 2002-09-26 Adjusting drive WO2003062011A1 (en)

Applications Claiming Priority (2)

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

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WO2003062011A1 true WO2003062011A1 (en) 2003-07-31

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WO (1) WO2003062011A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1882577A1 (en) * 2006-07-26 2008-01-30 SITI S.p.A. Gearmotor and method for making it

Families Citing this family (1)

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

Citations (5)

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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 (en) * 1995-08-18 1997-02-26 Robert Bosch Gmbh Device for adjusting automotive vehicle seats
DE19545786A1 (en) * 1995-12-08 1997-06-12 Fritz Stahlecker Open end spinning rotor
EP0868009A1 (en) * 1997-03-25 1998-09-30 Robert Bosch Gmbh Electromotor-worm reduction gear assembly
EP1223073A2 (en) * 2000-12-19 2002-07-17 Robert Bosch Gmbh Gear drive unit, particularly for a seat adjustment or a power steering system, with at least a support element

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 (en) * 1995-08-18 1997-02-26 Robert Bosch Gmbh Device for adjusting automotive vehicle seats
DE19545786A1 (en) * 1995-12-08 1997-06-12 Fritz Stahlecker Open end spinning rotor
EP0868009A1 (en) * 1997-03-25 1998-09-30 Robert Bosch Gmbh Electromotor-worm reduction gear assembly
EP1223073A2 (en) * 2000-12-19 2002-07-17 Robert Bosch Gmbh Gear drive unit, particularly for a seat adjustment or a power steering system, with at least a support element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1882577A1 (en) * 2006-07-26 2008-01-30 SITI S.p.A. Gearmotor and method for making it

Also Published As

Publication number Publication date
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