DE102017214116A1 - Drive device for a window regulator - Google Patents

Abstract

A drive device (1) for a window lifter comprises a motor unit (2) which has a motor housing (20), an electric motor assembly (23) enclosed in the motor housing (20) and a drive motor driven by the electric motor assembly (23) along a longitudinal axis (L). extending and about the longitudinal axis (L) to the motor housing (20) rotatable drive shaft (21), and a transmission unit (3) having a with the motor housing (20) connected to the transmission housing (30) and via the drive shaft (21) drivable Output element (31) for outputting an adjusting force. It is provided that the motor unit (2) has a damping assembly (24) arranged in the motor housing (20) with a damping element (240) made of an elastic material for supporting a first axial end (211) of the drive shaft (21) relative to the motor housing (20). In this way, a drive device is provided in which effective and simple means a vibration excitation, in particular on the motor housing, for example, when switching the direction of rotation can be reduced.

Description

The invention relates to a drive device for a window regulator according to the preamble of claim 1.

Such a drive device comprises a motor unit which has a motor housing, an electric motor assembly enclosed in the motor housing and a drive shaft which can be driven by the electric motor assembly and extends along a longitudinal axis and rotatable about the longitudinal axis to the motor housing. The motor housing of the motor unit is connected to a gear housing of a gear unit, which has an output element drivable via the drive shaft for outputting an adjusting force.

Such a drive device may for example be part of a cable window lifter, wherein the output element is connected to a cable drum to act on the cable drum on a tension member in the form of a pull cable for adjusting drivers along guide rails and thereby for adjusting a window pane connected to the drivers. Powered by the motor unit, the window pane can thus be moved between different positions on a vehicle door.

Drive devices of this type are now produced lightweight. As a result, in particular housing parts of the drive device can be excited to oscillate during operation of the drive device, which can cause (undesired) noise excitation on the drive device.

Such a noise excitation can occur in particular when switching the direction of rotation of the drive device. In general, the drive shaft has a certain axial play in its bearing in the motor housing and the gear housing in order to ensure a smooth running of the drive shaft. However, this has the consequence that when switching the direction of rotation, the drive shaft is slightly offset axially in one direction or the other direction and thereby possibly beating against housing parts, which in turn may have a vibration excitation result.

Such vibration excitation can already set in newly installed drive devices, but can also increase over the life of a drive device due to a change in the axial play of the drive shaft yet.

In order to provide an axial damping on the drive shaft, is conventionally in drive devices for driving window regulators, as for example from DE 10 2010 048 971 A1 or the DE 10 2015 211 147 A1 are known, provided to provide a damping element between the drive shaft and the transmission housing. However, such a damping element on the side of the transmission housing may possibly only insufficiently prevent vibration excitation on a motor housing connected to the transmission housing.

Object of the present invention is to provide a drive device for a window available in which effectively and by simple means a vibration excitation, in particular on the motor housing, for example, when switching the direction of rotation can be reduced.

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

Accordingly, the motor unit has a damping assembly arranged in the motor housing with a damping element made of an elastic material for supporting a first axial end of the drive shaft relative to the motor housing.

An attenuation of the drive shaft in the axial direction thus takes place in the motor housing via a damping assembly accommodated therein. The damping element is made of an elastic material, for example a rubber material, and supports the drive shaft in the axial direction, viewed along the longitudinal axis, along which the drive shaft extends, relative to the motor housing.

Characterized in that the damping assembly is arranged in the motor housing, a vibration excitation, in particular on the motor housing can be effectively avoided. If the direction of rotation of the drive device is switched, so, with an axial displacement of the drive shaft in the direction of the motor housing, abutting the drive shaft to the motor housing via the damping element of the damping assembly is attenuated by energy is absorbed at the damping element and consequently reduces vibration excitation of the motor housing is.

It has been found that an axial damping of the drive shaft via a damping assembly at the motor housing associated axial end of the drive shaft may be sufficient to provide sufficient acoustic damping to the drive device in particular for suppressing an acoustic stimulus when switching the direction of rotation. On a damping at the other axial end of the drive shaft may optionally be omitted, so that a Damping takes place exclusively on the motor housing associated axial end of the drive shaft.

However, it is also conceivable and possible, as will be described below, to provide damping via a further damping assembly also at the other axial end of the drive shaft.

In one embodiment, the motor housing has a motor pot at least partially enclosing the electric motor assembly and a housing bush projecting axially from the motor pot. For example, the engine pot may have a cylindrical basic shape and supports a stator of the electric motor assembly to which a rotor connected to the drive shaft (which carries coil windings in a brush-commutated DC motor, for example) of the electric motor assembly is rotatably disposed. The housing socket can also have a cylindrical shape, but it has a (significantly) smaller inner diameter than the motor pot. In the housing bush, the damping assembly is preferably received and edged.

On a side facing away from the housing socket, the motor pot can be connected, for example, via a fastening device in the form of a flange or the like to the transmission housing. The motor housing can be bolted or riveted to the transmission housing in this way, for example.

In one embodiment, the damping element is annular. The damping element may extend, for example meandering around the longitudinal axis, with circumferentially juxtaposed elevations and arranged between the elevations depressions. By such a meandering configuration of the damping element, the elasticity of the damping element can be improved in order to achieve favorable damping properties of the damping element.

The damping element may for example be made of a rubber material. It is also conceivable and possible, however, to manufacture the damping element from a different material with elastic properties, for example from a (soft) elastic plastic material.

In one embodiment, the damping assembly on a start-up element on which the drive shaft is applied. The starting element is made of a - compared to the damping element - harder material, for example, a (hard) plastic material, manufactured and has, for example, good sliding properties to ensure smooth rotation of the drive shaft. The starting element is supported via the damping element relative to the motor housing and thus damped relative to the motor housing, so that via the starting element and the drive shaft is damped in the axial direction relative to the motor housing.

In one embodiment, the starting element has a body and a pin projecting axially along the longitudinal axis from the body. For example, the body may have a generally disk-shaped configuration and provides a run-on surface on which the drive shaft abuts with its axially first end. At the protruding from the body pin, the damping element is arranged and preferably extends around the pin, so that over the pin, the damping element is fixed in its position relative to the starting element. In operation, the starting element is supported via the damping element in the axial direction of the motor housing, wherein on the pin also an end stop can be provided, with which the starting element comes in (strong) compression of the damping element with the motor housing in abutment. An excessive compression of the damping element in the axial direction can thus also be avoided via the pin, which can be advantageous for the service life of the damping element.

As already mentioned above, damping of the drive shaft can take place exclusively at the first axial end via the damping assembly assigned to this axial end of the drive shaft. It is also conceivable and possible, however, to provide at the other, second axial end of the drive shaft, a further, second damping assembly having a made of an elastic material, further damping element, via which the drive shaft is supported at the second axial end relative to the transmission housing. The drive shaft is thus on the one hand supported and damped on the one hand via the first damping assembly at the first axial end relative to the motor housing and is also supported and damped via the disposed at the second axial end, the second damping assembly relative to the transmission housing. In this way, a vibration excitation on the drive device may be further reduced under certain circumstances.

In one embodiment, the drive device has a drive worm arranged on the drive shaft and a drive wheel mounted rotatably in the transmission housing and operatively connected to the output element. The drive worm preferably has a worm gear, which with an external toothing of the Spur gear formed drive gear in meshing engagement is such that a rotational movement of the drive screw is transmitted in a rotational movement of the drive wheel. The drive wheel is operatively connected to the output element, for example, integrally formed with the output element or connected to the output element such that during a rotational movement of the drive wheel, the output element is moved. Driven by the motor unit, the drive wheel can thus be placed on the drive screw in a rotational movement to drive over the output element and, for example, a connected to the driven element cable drum.

The drive shaft is preferably rotatably mounted in the motor housing. For this purpose, for example, the first axial end of the drive shaft, a bearing element, for example in the form of a radial sliding bearing, be assigned, via which the drive shaft is rotatably supported and supported to the motor housing. By way of another bearing element, the drive shaft can be mounted, for example, in the transmission housing, so that the drive shaft is supported along its axial length both to the motor housing and to the transmission housing.

A drive device of the type described here can be used for a window lifter, in particular a cable window lifter. Conceivable and possible is a use of the drive device but also for completely different adjustment devices in a vehicle, in particular for adjusting an adjustment part on a vehicle door or on another assembly in a vehicle, for example on a vehicle seat.

• 1A eine Ansicht eines Ausführungsbeispiels einer Antriebsvorrichtung;
• 1B eine andere, rückseitige Ansicht der Antriebsvorrichtung;
• 2 eine Ansicht der Antriebsvorrichtung ohne ein Motorgehäuse;
• 3 eine Ansicht der Antriebsvorrichtung ohne ein Getriebegehäuse, darstellend eine an einer Antriebswelle angeordnete Antriebsschnecke in Verzahnungseingriff mit einem Antriebsrad einer Getriebeeinheit;
• 4 eine Ansicht eines Ausführungsbeispiels einer Motoreinheit mit einer in dem Motorgehäuse aufgenommenen Dämpfungsbaugruppe zum axialen Abstützen der Antriebswelle gegenüber dem Motorgehäuse;
• 5 eine Ansicht des Motorgehäuses zusammen mit der Dämpfungsbaugruppe;
• 6 eine gesonderte Ansicht der Dämpfungsbaugruppe;
• 7 eine Ansicht eines anderen Ausführungsbeispiels einer Antriebsvorrichtung; und
• 8 eine schematische Ansicht einer Verstelleinrichtung eines Fahrzeugs in Form eines Fensterhebers.

The idea underlying the invention will be explained in more detail with reference to the embodiments illustrated in the figures. Show it:

• 1A a view of an embodiment of a drive device;
• 1B another, rear view of the drive device;
• 2 a view of the drive device without a motor housing;
• 3 a view of the drive device without a transmission housing, representing a drive shaft arranged on a drive screw in meshing engagement with a drive wheel of a transmission unit;
• 4 a view of an embodiment of a motor unit with a received in the motor housing damping assembly for axially supporting the drive shaft relative to the motor housing;
• 5 a view of the motor housing together with the damping assembly;
• 6 a separate view of the damping assembly;
• 7 a view of another embodiment of a drive device; and
• 8th a schematic view of an adjustment of a vehicle in the form of a window regulator.

1A . 1B to 3 show an embodiment of a drive device 1 , which is for example part of an adjusting device in the form of a window lift, as shown schematically in FIG 8th is shown.

Such an adjusting device in the form of a window regulator has, for example, a pair of guide rails 11 on, one at each with a windowpane 13 coupled driver 12 is adjustable, as exemplified in 8th is shown. Every driver 12 is over a rope 10 , which is designed for the transmission of (exclusively) tensile forces, with a drive device 1 coupled, with the pull rope 10 forms a closed loop of rope and with its ends with a cable drum of the drive device 1 connected is. The rope 10 extends from the drive device 1 around pulleys 110 at the lower ends of the guide rails 11 to the drivers 12 and of the drivers 12 around pulleys 111 at the upper ends of the guide rails 11 back to the drive device 10 ,

In operation drives a motor unit 2 the drive device 1 the cable drum such that the pull rope 10 with one end wound on the cable drum and unwound with the other end of the cable drum. This shifts through the pull rope 10 formed rope loop without changing the freely extended rope length, which leads to the driver 12 on the guide rails 11 rectified moves and thereby the window pane 13 along the guide rails 11 is adjusted.

The window is in the embodiment according to 8th on an aggregate carrier 4 a door module arranged. The aggregate carrier 4 For example, it can be fixed to a door inner panel of a vehicle door and represents a preassembled unit which is preassembled with on the subframe 4 arranged window can be mounted on the vehicle door.

The drive device 1 according to 1A . 1B to 3 has a motor unit 2 and a transmission unit 3 on. As for example from the sectional view according to 4 can be seen, the motor unit 2 a motor housing 20 on that with a gearbox 30 the gear unit 3 is connected and an electric motor assembly 23 with a stationary in the motor housing 20 held stator 230 and one on a drive shaft 21 arranged rotor 231 surrounds. The electric motor assembly 23 serves to drive the drive shaft 21 that - like out 3 visible - a drive screw 22 carries, via a worm gear with an external toothing of a spur gear formed by a spur gear 32 is engaged and thus a rotational movement of the drive shaft 21 in a rotational movement of the drive wheel 32 transfers.

With the drive wheel 32 is an output element 31 (please refer 1A) connected, which is a connection of the drive wheel 32 For example, with a cable drum of a window lifter manufactures. The output element 31 can for example in one piece with the drive wheel 32 or also in several parts with the drive wheel 32 be formed, but in any case so with the drive wheel 32 connected to that during a rotational movement of the drive wheel 32 the output element 31 is twisted and thus one with the drive element 31 Connected cable drum is driven.

Both the gearbox 30 as well as the motor housing 20 are made for example as plastic components. The motor housing 20 has a motor pot 200 with a cylindrical basic shape in which the electric motor assembly 23 is bordered and in particular the stator 230 wearing. The engine pot 200 is about a fastening device 202 in the form of a radially projecting flange 202 with the gearbox 30 connected, for example screwed.

The drive shaft 21 extends along a longitudinal axis L and is in operation about the longitudinal axis L twisted by turning the drive worm 22 the drive wheel 32 and about the output element 31 drive.

4 shows a sectional view of an embodiment in which the drive shaft 21 via a bearing element 210 at a first axial end 211 rotatably in the motor housing 20 is stored.

At its first axial end 211 is the drive shaft 21 via a damping assembly 24 in an axial position on the engine pot 200 subsequent housing socket 201 of the motor housing 20 is included, opposite the motor housing 20 supported. About the damping assembly 24 becomes an axial damping along the longitudinal axis L the drive shaft 21 opposite the motor housing 20 causes, in particular, a vibration excitation on the motor housing 20 when switching the direction of rotation of the drive device 1 and consequently at a (minor) axial displacement of the drive shaft 21 helps to reduce.

The damping assembly 24 shows how out 5 and 6 seen, a damping element 240 on, that at a starting element 241 is arranged. The starting element 241 has a body 242 in the form of a cylindrical disc and one axially of the body 242 protruding pin 243 on, on which the damping element 240 is arranged.

The damping element 240 is made in one piece from a (soft) elastic material, for example a rubber material, which has favorable damping properties. As in particular from 6 can be seen, the damping element extends 240 ring around the longitudinal axis L and in this case has a meandering shape, with elevations formed axially on both sides 244 between which pits 245 are shaped.

The damping element 240 supports the starting element 241 axially opposite a rear wall 203 the housing socket 201 from. The drive shaft 21 runs on the starting element 241 , preferably one in comparison to the damping element 240 harder material with favorable sliding properties for the running of the drive shaft 21 is made.

Due to the shape of the damping element 240 and the manufacture of the damping element 240 made of an elastic, damping material and due to the interposition of the damping element 240 between the back wall 203 the housing socket 201 and the body 242 of the starting element 241 is the drive shaft 21 dampening against the motor housing 20 supported, so that an axial offset of the drive shaft 21 when switching the direction of rotation does not lead to a hard hitting the drive shaft 21 on the motor housing 20 leads. A vibration excitation on the motor housing 20 and also on the transmission housing 30 can be effectively reduced in this way.

About the cone 243 of the starting element 241 In this case, an end stop is predetermined, which at a predetermined compression of the damping element 240 axially along the longitudinal axis L with the back wall 203 the housing socket 201 got into contact. About this end stop in the form of the pin 243 Thus, the compression of the damping element 240 limited in the axial direction, which is favorable for the life of the damping element 242 can be.

Basically, a damping via a damping assembly 24 at the motor housing 20 associated, first axial end 211 the drive shaft 21 for an effective Reduction of vibration excitation be sufficient. In a modified embodiment, shown in an embodiment in FIG 7 , may be another, second damping assembly 25 with a damping element 250 and a starting element 251 (as above for the damping element 240 and the starting element 241 described may be configured) but also at the axially other end 212 the drive shaft 21 for damping support of the drive shaft 21 opposite the gearbox 30 be provided so that the drive shaft 21 on both sides, namely both with respect to the motor housing 20 as well as towards the gearbox 30 , is axially damped.

On such a further, second damping assembly 25 as I said but can also be dispensed with.

The idea underlying the invention is not limited to the embodiments described above, but can also be realized in a completely different manner.

In particular, a drive device of the type described here is not limited to use on a window regulator, in particular a cable window lifter, but can also be used in other adjustment devices in a vehicle, for example for adjusting an adjustment part of a vehicle door or a seat assembly.

The motor unit and / or the gear unit can also have a different form than described here by way of example. In particular, a transmission other than that described here, for example a planetary gear or the like, can be used.

The electric motor of the motor unit may be formed, for example, as a brush-commutated DC motor. Conceivable, however, are other types of motor, for example, brushless DC motors or the like.

LIST OF REFERENCE NUMBERS

1

driving device

10

rope

11

guide rail

110, 111

redirection

12

takeaway

13

windowpane

2

motor unit

20

motor housing

200

motor pot

201

housing socket

202

Fixing section (flange)

203

rear wall

21

drive shaft

210

bearing element

211, 212

Axial end

22

drive worm

23

Electric motor assembly

230

stator

231

rotor

232

commutator

24

damping assembly

240

damping element

241

thrust element

242

body

243

spigot

244

survey

245

deepening

25

damping assembly

250

damping element

251

thrust element

3

gear unit

30

gearbox

31

output element

32

drive wheel

33

control electronics

34

connection

4

Carrier element (subframe)

L

longitudinal axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 102010048971 A1 [0007]
• DE 102015211147 A1 [0007]

Claims (11)

Drive device (1) for a window regulator, comprising - a motor unit (2) comprising a motor housing (20), an electric motor assembly (23) enclosed in the motor housing (20), and a motor driven by the electric motor assembly (23) along a longitudinal axis (L ) and about the longitudinal axis (L) to the motor housing (20) rotatable drive shaft (21), and - a transmission unit (3) having a motor housing (20) connected to the transmission housing (30) and via the drive shaft (21 ) drivable output element (31) for outputting an adjusting force, characterized in that the motor unit (2) arranged in the motor housing (20) damping assembly (24) with a made of an elastic material damping element (240) for supporting a first axial end (211) of the drive shaft (21) relative to the motor housing (20). Drive device (1) after Claim 1 , characterized in that the motor housing (20) has a motor pot (200) at least partially enclosing the motor assembly (200) and an axially projecting from the motor pot (200) housing bushing (201), wherein the damping assembly (24) in the housing bushing (201 ) is recorded. Drive device (1) after Claim 2 , characterized in that the motor pot (200) via a fastening device (202) on a side facing away from the housing bushing (201) side with the transmission housing (30) is connected. Drive device (1) according to one of Claims 1 to 3 , characterized in that the damping element (240) is annular. Drive device (1) after Claim 4 , characterized in that the damping element (240) viewed circumferentially around the longitudinal axis (L), meandering with axially projecting, circumferentially juxtaposed elevations (244) and between the elevations (244) arranged recesses (245) is formed. Drive device (1) according to one of the preceding claims, characterized in that the damping element (240) is made of a rubber material. Drive device (1) according to one of the preceding claims, characterized in that the damping assembly (24) has a starting element (241), on which the drive shaft (21) is supported and via the damping element (240) relative to the motor housing (20) supported is. Drive device (1) after Claim 7 characterized in that the abutment member (241) comprises a body (242) and a pin (243) projecting axially along the longitudinal axis (L) of the body (242), the cushioning member (240) being disposed on the pin (243) is. Drive device (1) according to one of the preceding claims, characterized in that a the first axial end (211) of the drive shaft (21) facing away, the second axial end (212) of the drive shaft (21) via a further damping assembly (25) with a an elastic damping material further supported damping element (250) relative to the transmission housing (30) is supported. Drive device (1) according to one of the preceding claims, characterized by a drive worm (22) arranged on the drive shaft (21) and a drive wheel (32) mounted rotatably in the transmission housing (30) and operatively connected to the output element (31) Drive worm (22) is operatively connected in such a way that the drive wheel (32) by a rotational movement of the drive worm (22) can be driven. Drive device (1) according to one of the preceding claims, characterized in that the first axial end (211) via a bearing element (210) in the motor housing (20) is mounted.

Images