DE102019201802A1 - Retaining pin for axial play compensation - Google Patents

Abstract

A retaining pin (1) for mounting in a receptacle (20) comprises: a cylindrical base body (10) with a cylinder axis (Z) and a lateral surface (M) and at least one of the lateral surface (M) protruding radially outward and a cutting edge ( 110) forming projection (11) which is designed to move radially inward when the retaining pin (1) is rotated in the receptacle (20) about the cylinder axis (Z) and while maintaining the axial position relative to the receptacle (20) cut the protruding material area (201) of the receptacle (20).

Description

The invention relates to a retaining pin according to claim 1, an assembly, a drive device and a method.

Components are usually manufactured with certain manufacturing tolerances. If components subject to tolerances are assembled, there is often play. In particular in the case of movable components, such play can lead to the development of noise. For example, a worm shaft of a worm gear can have axial play in its mounting, which, for example, can lead to noise when the direction of rotation is changed. To avoid such noises, it is possible to compensate for the axial play by using spring elements such as rubber springs, as in the DE 19 537 503 A1 described in the introduction.

Such spring elements can, however, have the disadvantage that they exert pressure on the shaft and thus make it difficult to rotate the shaft. This can result in reduced efficiency of the transmission. Furthermore, springs of this type can in particular cause a changeover stroke when a drive motor changes direction of rotation, e.g. as a result of a bias of the spring previously built up in one direction by the drive motor. This can produce a noticeable noise. In many applications, however, operation that is as quiet as possible is desirable.

The object of the present invention is to enable an improved axial play compensation.

This object is achieved by an object with the features of claim 1.

A retaining pin is then provided for mounting in a receptacle, e.g. can be used to compensate for axial play on a shaft. The retaining pin comprises a cylindrical base body with a cylinder axis and an outer jacket surface and at least one projection protruding radially outward from the jacket surface and forming a cutting edge. The projection is designed to cut into a radially inwardly protruding material region of the receptacle by means of the cutting edge when the retaining pin (arranged in the receptacle) is rotated about its cylinder axis and while maintaining its axial position relative to the receptacle.

Such a self-tapping retaining pin can be inserted into a correspondingly shaped receptacle until a specific game is compensated. In this position the retaining pin can be fastened in the receptacle, this fastening being possible without exerting an axial force or with a negligibly small axial force (along the cylinder axis of the retaining pin), e.g. on a shaft supported without axial play by means of the retaining pin. In this way, noise during operation of the shaft can be reduced or avoided entirely. In addition, a particularly smooth mounting of the shaft is made possible, which can lead to improved efficiency of the device. The axial play compensation is thus improved in particular to the effect that less noise and, at the same time, improved efficiency are made possible.

The projection can be designed as a milling tooth. For example, the projection is designed according to a milling tooth of a thread cutter for an internal thread, with the difference that the projection of the retaining pin has no slope (that is, it follows an arc of a circle and not a helix). A milling tooth can cut particularly effectively.

The projection runs, for example, in the circumferential direction around the cylinder axis of the retaining pin along a section of the lateral surface. The projection runs e.g. within a plane perpendicular to the cylinder axis.

The retaining pin can have a plurality of projections for a particularly secure attachment to the receptacle, e.g. more than ten ledges. The plurality of protrusions optionally each have the same shape.

In one embodiment, a plurality of projections arranged offset from one another along the cylinder axis form a group of projections.

Furthermore, a plurality of groups of projections arranged offset from one another in particular in the circumferential direction can be provided, which enables particularly uniform cutting. (Exactly) three groups of projections are optionally provided. This enables particularly symmetrical cutting without tilting.

The retaining pin can comprise a tool interface (e.g., Torx, hexagon socket, slot or cross-slot) formed on one axial end of the retaining pin and / or a stop surface formed on one (other) axial end.

According to one aspect, an assembly for axial play compensation is provided, with a retaining pin and a carrier. The retaining pin can be designed according to any configuration described herein and comprises a cylindrical base body with a cylinder axis and a lateral surface and at least one of the lateral surface radially outwardly protruding and a cutting edge forming projection. The carrier has a receptacle into which the retaining pin can be inserted axially and which has at least one inwardly protruding material area into which the projection of the retaining pin can cut when the retaining pin inserted into the receptacle is rotated (relative to the receptacle) about its cylinder axis, to attach the retaining pin to the carrier, in particular to secure it axially.

Optionally the carrier is designed as a housing, e.g. as a gear housing for an adjusting drive, for example.

The retaining pin can be rotated at various insertion depths in the holder of the carrier around its cylinder axis relative to the receptacle, so that the projection of the retaining pin can cut into the inside protruding material area of the receptacle at the respective insertion depth in order to fasten the retaining pin to the carrier at this insertion depth. Depending on how large a specific axial play is, the retaining pin can thus be inserted deeper or less deep into the receptacle and fixed in this position by turning. Elastic spring elements are no longer necessary.

The retaining pin has an outer contour that matches an inner contour of the receptacle. The inner contour is defined in particular by the inwardly protruding material areas and pockets formed in between, the outer contour by the jacket surface and the projections.

According to one aspect, a drive device with an axial play compensation is provided. The drive device comprises the assembly according to any configuration described herein and a shaft which is rotatably mounted on a bearing point of the carrier of the assembly.

The retaining pin can be inserted into the receptacle in such a way that it can act directly or indirectly on an axial end of the shaft, e.g. can be brought into contact with it or an intermediate component can come into contact with it.

Optionally, a form-fit receptacle is formed on the carrier and a form-fit insert is provided, wherein the form-fit insert can be inserted into the form-fit receptacle in such a way that it is positively secured against rotation relative to the form-fit receptacle (in particular against rotation about the cylinder axis of the retaining pin arranged in the receptacle). The form-fit insert can prevent a rotation of the shaft from inadvertently releasing the retaining pin fastened in the receptacle.

The form fit recording is e.g. arranged between the receptacle for the retaining pin and the bearing point.

The form-fit insert can be inserted into the form-fit receptacle in such a way that it can be brought into contact with the axial end of the shaft by inserting the retaining pin into the receptacle in order to compensate for any possible axial play.

The retaining pin can be fastened in a position in which the form-fit insert is in contact (or almost in contact) with the axial end of the shaft and the retaining pin by rotating around its cylinder axis in order to mount the shaft on the carrier without axial play .

The shaft is optionally designed as a worm shaft. The drive device comprises e.g. a worm gear.

According to one aspect, a method for mounting the retaining pin on the carrier of the assembly or the drive device according to any configuration described herein is provided. The method comprises the following steps: first, the retaining pin is inserted into the receptacle of the carrier, then the retaining pin is rotated about its cylinder axis relative to the receptacle in such a way that the at least one projection of the retaining pin cuts into the at least one inwardly protruding material area of the receptacle, whereby the retaining pin is attached to the carrier.

Optionally, the carrier has a bearing point for a shaft and is designed so that the retaining pin can be inserted into the receptacle in such a way that it can act directly or indirectly on an axial end of the shaft mounted on the bearing point, and wherein the retaining pin is so deep in the receptacle is inserted so that the shaft is mounted on the carrier without axial play as a result of this action.

• 1 einen Haltestift zum Axialspielausgleich;
• 2 eine Antriebsvorrichtung in Form eines Verstellantriebs für eine Fahrzeugkomponente mit dem Haltestift gemäß 1;
• 3A und 3B Ansichten der Antriebsvorrichtung gemäß 2 in einem ersten Stadium des Zusammenbaus;
• 4A und 4B Ansichten der Antriebsvorrichtung gemäß 2 in einem zweiten Stadium des Zusammenbaus;
• 5 einen Fahrzeugsitz mit der Antriebsvorrichtung gemäß 2 bis 4B; und
• 6 ein Kraftfahrzeug mit mehreren Antriebsvorrichtungen gemäß 2 bis 4B.

The idea on which the invention is based is to be explained in more detail below with reference to the exemplary embodiments shown in the figures. It shows in schematic representations:

• 1 a retaining pin for axial play compensation;
• 2 a drive device in the form of an adjusting drive for a vehicle component with the retaining pin according to FIG 1 ;
• 3A and 3B Views of the drive device according to 2 in a first stage of assembly;
• 4A and 4B Views of the drive device according to 2 in a second stage of assembly;
• 5 a vehicle seat with the drive device according to FIG 2 to 4B ; and
• 6 a motor vehicle with several drive devices according to 2 to 4B .

1 shows a retaining pin 1 . The retaining pin 1 has a base body 10 which has a substantially circular cylindrical shape. The basic body 10 has a cylinder axis Z, a lateral surface M and two opposite axial ends.

Several projections extend from the jacket surface M 11 in the form of milling teeth radially outwards and along the circumferential direction U around the cylinder axis Z. The projections 11 are in groups G1-G3 arranged, here in three groups G1-G3 , which are arranged offset from one another by 120 ° in the circumferential direction U. Every group G1-G3 includes a plurality of protrusions 11 , which are arranged equidistantly offset from one another along the cylinder axis Z. Each of the ledges 11 has the shape of a rib that tapers sharply as a blade. The protrusions 11 each include at least one cutting edge 110 , In the present case, a cutting edge in the circumferential direction U at each end 110 .

Will the retaining pin 1 inserted into a receptacle, the one to the lateral surface M and the projections 11 has suitably designed inner contour, and then rotated in the receptacle about its cylinder axis Z, then cut the projections 11 with their cutting edges 110 into the material of the receptacle so that the retaining pin 1 is attached to the recording. The cutting takes place without feed in the axial direction. Thus, the retaining pin 1 inserted so far into the receptacle (with a force that can approach zero N) and fastened at this insertion depth that optimal play compensation for adjacent components is achieved.

The retaining pin 1 is in one piece and made, for example, of metal, for example steel. The retaining pin 1 has the shape of a pin.

2 Figure 3 shows an assembly comprising the retaining pin 1 according to 1 and a carrier 2 , which is designed here in the form of a housing, specifically a gear housing. There is a shaft in the gear housing 3 rotatably mounted in the form of a worm shaft and is in gear connection with a worm wheel. The wave 3 is through an in 2 not shown electric motor driven. The assembly is thus part of a drive device A.

When storing the shaft 3 Several manufacturing tolerances add up, specifically those of the shaft 3 even that of the wearer 2 and that of a form fit insert 4th on which the wave 3 can support axially. These tolerances can lead to axial play.

The retaining pin is used to compensate for this axial play 1 for this purpose in a coaxial to the axis of rotation of the shaft 3 aligned recording 20th of the wearer 2 can be used. The retaining pin is used for this 1 in the recording 20th plugged in, like in 2 illustrated by means of an arrow. As in 2 shown shows the recording 20th one for the retaining pin inserted in the axial direction 1 matching inner contour.

3A and 3B show the retaining pin 1 during the insertion process. The inside contour of the recording 20th is through bags 200 and across from the pockets 200 material areas protruding radially inward 201 Are defined. In the present case, the receptacle comprises three pockets 200 and three inwardly protruding material areas 201 . The inward protruding material areas 201 each describe a section of a cylinder jacket and guide the retaining pin 1 on its outer surface M. The pockets 200 take the ledges 11 on.

In the intermediate position according to 3B is the retaining pin 1 in contact with the form fit insert 4th which here is still at a distance from an axial end 30th the wave 3 is arranged. The form fit insert 4th is displaceable along an axis and form-fitting against rotation about this axis in a form-fit receptacle 22nd of the wearer 2 arranged. As in particular in 2 the form-fit insert can be seen 4th in the present example essentially star-shaped.

The recording 20th , the axis of the form fit receptacle 22nd and the one at the depository 21st bearing shaft 3 are aligned coaxially to one another.

The retaining pin 1 is opposite 3B deeper into the recording 20th inserted until the retaining pin 1 with a stop surface 13th to the form fit insert 4th is posted and the form fit insert 4th in contact with the axial end of the shaft 3 brought.

The retaining pin will then 1 in the recording 20th rotated as in 4A illustrated by means of an arrow. Here the projections intersect 11 with their cutting edges 110 in the inwardly protruding material areas 201 the recording 20th a. For example, a rotation of 50 ° to 70 ° is carried out. The rotation takes place, for example, by means of a to the axial end of the retaining pin 1 provided tool interface 12th suitable tool.

The rotation of the retaining pin 1 has no axial displacement of the retaining pin 1 result, so that it is possible to use the form-fit insert 4th To be fixed free of play, but essentially free of axial forces.

The 4A and 4B show the inward protruding material areas in the material 201 incised projections 11 . The protrusions 11 can also be described as teeth. The incised protrusions 11 in particular prevent axial displacement of the retaining pin 1 .

The carrier 2 is eg from a compared to the retaining pin 1 made of softer material, e.g. aluminum or plastic.

The form fit insert 4th catches a torque of the shaft 3 from.

Because the wave 3 is mounted essentially free of axial play, there is particularly little noise during use. In addition, the wave 3 Rotate particularly easily because it is not subjected to an axial force of a spring element or the like.

5 shows an adjustable vehicle seat 5 . The vehicle seat comprises a seat part with several side parts 50 , of which in 5 only one is shown and one in 5 dashed seat cushion shown. The vehicle seat also includes 5 a backrest that is in 5 is only hinted at. The vehicle seat 5 comprises the drive device A, here for adjusting the position of the seat cushion relative to the side parts 50 . For this purpose, the drive device A is on one side part 50 mounted and via a Bowden cable with an adjustment mechanism 52 coupled. Will the adjustment mechanism 52 adjusted by activating the drive device A, this then changes the position of a cross strut supporting the seat cushion 51 relative to the side panels 50 changed. In this way, for example, the seat height can be adjusted or an easy-entry function can be provided.

The vehicle seat 5 furthermore comprises a longitudinal adjustment device 53 , which optionally also by means of a drive device A according to 2 to 4B is adjustable. Furthermore, the inclination of the backrest can be adjusted relative to the seat part. For this purpose, too, the vehicle seat can have a drive device A coupled, for example, to a corresponding inclination adjuster according to FIG 2 to 4B include. Further possible adjustment functions of the vehicle seat 5 can also be coupled to such a drive device A, for example a seat depth adjustment and / or an adjustable lumbar support.

5 also shows a drive motor 6 the drive device A, which is designed here in the form of an electric motor.

6 shows a motor vehicle 7th with several drive devices A according to 2 to 4B .

A drive device A is with a window regulator 700 a door 70 of the motor vehicle 7th effectively connected. The drive device drives, for example, the driver of the window regulator 700 to put a window on the door 70 to move up and down.

Another drive device A is with a door lock 701 coupled. By means of this drive device A is the door lock 701 unlockable and lockable.

A drive device A is also provided with a trunk lid 71 of the motor vehicle coupled. Activation of this drive device A opens the trunk lid 71 can be opened and closed.

Alternatively or additionally, the motor vehicle 7th holding pins in several places 1 , optionally also without an associated drive device A, for example at points where an axial play is to be set and / or where a fixation in a certain axial position is necessary, for example generally with drives, controls and sensors, in particular their arrangement in the vehicle 7th .

List of reference symbols

1

Retaining pin

10

Base body

11

head Start

110

Cutting edge

12th

Tool interface

13th

Stop surface

2

carrier

20th

admission

200

bag

201

Material area

21st

Depository

22nd

Form fit recording

3

wave

30th

axial end

4th

Form fit insert

5

Vehicle seat

50

Side part

51

Cross brace

52

Adjustment mechanism

53

Longitudinal adjustment device

6

Drive motor

7th

Motor vehicle

70

door

700

Window regulator

701

Door lock

71

Trunk lid

A.

Drive device

G1-G3

Group of protrusions

M.

Outer surface

U

Circumferential direction

Z

Cylinder axis

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 19537503 A1 [0002]

Claims (20)

Retaining pin (1) for mounting in a receptacle (20), comprising: - A cylindrical base body (10) with a cylinder axis (Z) and a lateral surface (M) and - At least one projection (11) protruding radially outward from the jacket surface (M) and forming a cutting edge (110), which projection (11) is designed to, upon rotation of the retaining pin (1) in the receptacle (20) about the cylinder axis (Z) and while maintaining the axial position relative to the receptacle (20) to cut into a radially inwardly protruding material region (201) of the receptacle (20). Retaining pin (1) Claim 1 , characterized in that the projection (11) is designed as a milling tooth. Retaining pin (1) Claim 1 or 2 , characterized in that the projection (11) extends in the circumferential direction (U) along a section of the lateral surface (M) and within a plane perpendicular to the cylinder axis (Z). Retaining pin (1) according to one of the preceding claims, characterized by a plurality of projections (11). Retaining pin (1) according to one of the preceding claims, characterized in that a plurality of projections (11) arranged offset to one another along the cylinder axis (Z) form a group (G1-G3) of projections (11). Retaining pin (1) Claim 5 , characterized by several groups (G1-G3) of projections (11) arranged offset from one another in the circumferential direction (U). Retaining pin (1) according to one of the preceding claims, characterized by a tool interface (12) formed on one axial end and a stop surface (13) formed on the other axial end. Assembly with: - A retaining pin (1), in particular according to one of the preceding claims, comprising a cylindrical base body (10) with a cylinder axis (Z) and a lateral surface (M) and at least one of the lateral surface (M) protruding radially outward and a cutting edge ( 110) forming projection (11) and - A carrier (2) with a receptacle (20) into which the retaining pin (1) can be inserted axially and which has at least one inwardly protruding material area (201) into which the projection (11) of the retaining pin (1) is inserted Rotation of the holding pin (1) inserted into the receptacle (20) about its cylinder axis (Z) can cut in order to attach the holding pin (1) to the carrier (2). Assembly according to Claim 8 , characterized in that the carrier (2) is designed as a housing. Assembly according to Claim 8 or 9 , characterized in that the retaining pin (1) can be rotated at different insertion depths in the receptacle (20) of the carrier (2) about its cylinder axis (Z) relative to the receptacle (20), so that the projection (11) of the retaining pin (1 ) can cut into the inside protruding material area (201) of the receptacle (20) in order to attach the retaining pin (1) to the carrier (2) at the respective insertion depth. Assembly according to one of the Claims 8 to 10 , characterized in that the retaining pin (1) has an outer contour that matches an inner contour of the receptacle (20). Drive device (A) comprising the assembly according to one of the Claims 8 to 11 and a shaft (3) which is mounted on a bearing point (21) of the carrier (2) of the assembly. Drive device (A) Claim 12 , characterized in that the retaining pin (1) can be inserted into the receptacle (20) in such a way that it can act directly or indirectly on an axial end (30) of the shaft (3). Drive device (A) Claim 12 or 13th , characterized by a form-fit receptacle (22) on the carrier (2) and a form-fit insert (4) which can be inserted into the form-fit receptacle (22) in such a way that it is positively secured against rotation relative to the form-fit receptacle (22). Drive device (A) Claim 14 , characterized in that the form-fit receptacle (22) is arranged between the receptacle (20) for the retaining pin (1) and the bearing point (21). Drive device (A) Claim 14 or 15th , characterized in that the form-fit insert (4) can be inserted into the form-fit receptacle (22) in such a way that it can be brought into contact with an axial end (30) of the shaft (3) by inserting the retaining pin (1) into the receptacle (20) is. Drive device (A) Claim 16 , characterized in that the retaining pin (1) is in a position in which the form-fit insert (4) is in contact with the axial end (30) of the shaft (3) and the retaining pin (1) by rotating around its cylinder axis ( Z) can be fastened in the receptacle (20) in order to mount the shaft (3) on the carrier (2) without axial play. Drive device (A) according to one of the Claims 12 to 17th , characterized in that the shaft (3) is designed as a worm shaft. Method for mounting the retaining pin (1) on the carrier (2) of the assembly according to one of the Claims 8 to 11 or the drive device (A) according to one of the Claims 12 to 18th , with the following steps: - inserting the retaining pin (1) into the receptacle (20) of the carrier (2), - rotating the retaining pin (1) around its cylinder axis (Z) relative to the receptacle (20) that the at least one projection (11) of the retaining pin (1) cuts into the at least one inwardly protruding material area (201) of the receptacle (20) so that the retaining pin (1) is fastened to the carrier (2). Procedure according to Claim 19 , wherein the carrier (2) has a bearing point (21) for a shaft (3) and is designed so that the retaining pin (1) can be inserted into the receptacle (20) in such a way that it is directly or indirectly onto an axial end ( 30) the shaft (3) mounted at the bearing point (21) can act, and the retaining pin (1) is inserted so far into the receptacle (20) that the shaft (3) is mounted on the carrier (2) without axial play.

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