WO2019030137A1

WO2019030137A1 - Drive device for a window lifter

Info

Publication number: WO2019030137A1
Application number: PCT/EP2018/071118
Authority: WO
Inventors: Maik Brumme; Christoph Haas; Udo Fischer
Original assignee: Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg
Priority date: 2017-08-11
Filing date: 2018-08-03
Publication date: 2019-02-14
Also published as: CN110809660A; DE102017214116A1

Abstract

The invention relates to a drive device (1) for a window lifter, comprising a motor unit (2), which has a motor housing (20), an electric motor assembly (23) housed in the motor housing (20), and a driveshaft (21) that can be driven by the electric motor assembly (23), extends along a longitudinal axis (L), and can be rotated about the longitudinal axis (L) relative to the motor housing (20); and a transmission unit (3), which has a transmission housing (30) that is connected to the motor housing (20) and an output element (31) that can be driven via the driveshaft (21) in order to output an adjustment force. The motor unit (2) has a damping assembly (24) which is arranged in the motor housing (20) and comprises a damping element (240) made of an elastic material for supporting a first axial end (211) of the driveshaft (21) against the motor housing (20). Thus, a drive device is provided with which a vibrational excitation, in particular on the motor housing when switching the rotational direction for example, can be reduced effectively and using simple means.

Description

Drive device for a window regulator

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 member 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 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, it has conventionally been provided in drive devices for driving window regulators, as known, for example, from DE 10 2010 048 971 A1 or DE 10 2015 211 147 A1, to provide a damping element between to provide 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, a stop of the drive shaft to the motor housing via the damping element of the damping assembly is attenuated by absorbing energy to the damping element and thus 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 dispensed with, so that a damping takes place exclusively at 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. The engine pot may, for example, have a cylindrical basic shape and carries a stator of the electric motor assembly, to which a rotor connected to the drive shaft (which in a brush-commutated DC motor carries coil windings, for example) of the electric motor assembly is rotatably arranged. 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 of the body protruding 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 on the motor housing, wherein over 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 toothing which meshes with external toothing of the drive wheel designed as a spur gear in such a way that a rotational movement of the drive worm is transferred into 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 rotary motion to about driving the output element and for example a cable drum connected to the output element.

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.

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

Fig. 1 A is a view of an embodiment of a drive device;

Fig. 1 B is another, rear view of the drive device;

Fig. 2 is a view of the drive device without a motor housing; 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 is a view of an embodiment of a motor unit with a damping assembly received in the motor housing for axially supporting the drive shaft relative to the motor housing;

Fig. 5 is a view of the motor housing together with the

Damping assembly; Fig. 6 is a separate view of the damping assembly;

Fig. 7 is a view of another embodiment of a

Driving device; and

Fig. 8 is a schematic view of an adjusting device of a vehicle in

Shape of a window regulator. 1A, 1 B 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. 8.

Such an adjusting device in the form of a window lifter has, for example, a pair of guide rails 1 1, on each of which a driver 12 coupled to a window pane 13 is adjustable, as shown by way of example in FIG. 8. Each driver 12 is coupled via a traction cable 10, which is designed for transmitting (exclusively) tensile forces, with a drive device 1, wherein the traction cable 10 forms a closed cable loop and is connected to its ends with a cable drum of the drive device 1. The traction cable 10 extends from the drive device 1 to guide rollers 1 10 at the lower ends of the guide rails 1 1 to the drivers 12 and 12 of the drivers around pulleys 1 1 1 at the upper ends of the guide rails 1 1 back to the drive device 10th

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

The window lifter is arranged in the embodiment of FIG. 8 on a subframe 4 of a door module. The subframe 4 can be fixed, for example, on a door inner panel of a vehicle door and represents a preassembled unit that can be mounted on the vehicle door preassembled with arranged on the subframe 4 windows. The drive device 1 according to FIGS. 1A, 1B to 3 has a motor unit 2 and a gear unit 3. For example, as seen in the sectional view of FIG. 4, the motor unit 2 includes a motor housing 20 connected to a gear housing 30 of the gear unit 3 and an electric motor assembly 23 having a stator 230 stationarily supported in the motor housing 20 and a drive shaft 21 arranged rotor 231 borders. The electric motor assembly 23 serves to drive the drive shaft 21, which - as shown in FIG. 3 - carries a drive worm 22 which is connected via a worm toothing with an outer toothing formed by a spur gear 32 and thus a rotational movement of the drive shaft 21 in a Rotary movement of the drive wheel 32 transmits.

Connected to the drive wheel 32 is an output member 31 (see FIG. 1A) which connects the drive wheel 32 to, for example, a cable drum of a window regulator. The output element 31 may for example be formed integrally with the drive wheel 32 or also in several parts with the drive wheel 32, but in any case connected to the drive wheel 32 that during a rotational movement of the drive wheel 32, the output element 31 is mitverdreht and thus one connected to the drive element 31 Cable drum is driven.

Both the gear housing 30 and 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 enclosed and in particular carries the stator 230. The motor pot 200 is connected via a fastening device 202 in the form of a radially projecting flange 202 with the gear housing 30, for example screwed.

The drive shaft 21 extends along a longitudinal axis L and is rotated in operation about the longitudinal axis L to drive by rotation of the drive screw 22, the drive wheel 32 and about the output member 31.

Fig. 4 shows a sectional view of an embodiment in which the drive shaft 21 is rotatably supported in the motor housing 20 via a bearing element 210 at a first axial end 21 1. At its first axial end 21 1, the drive shaft 21 is supported relative to the motor housing 20 via a damping assembly 24, which is accommodated in a housing bushing 201 of the motor housing 20 that adjoins the motor housing 200 axially. Via the damping assembly 24, an axial damping along the longitudinal axis L of the drive shaft 21 relative to the motor housing 20 is effected, in particular a vibration excitation on the motor housing 20 at a switching of the direction of rotation of the drive device 1 and consequently at a (minor) axial displacement of the drive shaft 21 to helps reduce.

The damping assembly 24 has, as shown in FIG. 5 and FIG. 6, a damping element 240, which is arranged on a stop element 241. The run-up element 241 has a body 242 in the form of a cylindrical disc and an axially projecting from the body 242 pin 243 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 can be seen in particular from FIG. 6, the damping element 240 extends annularly around the longitudinal axis L and in this case has a meandering shape, with elevations 244 formed on both sides on both sides, between which depressions 245 are formed.

The damping element 240 supports the contact element 241 axially with respect to a rear wall 203 of the housing bushing 201. The drive shaft 21 runs on the run-up element 241, which is preferably made of a material which is harder in comparison to the damping element 240 with favorable sliding properties for the run of the drive shaft 21. Due to the shape of the damping element 240 and the production of the damping element 240 made of an elastic, damping material and due to the interposition of the damping element 240 between the rear wall 203 of the housing sleeve 201 and the body 242 of the stop element 241, the drive shaft 21 is supported in damping against the motor housing 20, so that an axial displacement of the drive shaft 21 does not lead to a hard abutment of the drive shaft 21 to the motor housing 20 when switching the direction of rotation. A Vibration excitation on the motor housing 20 and also on the transmission housing 30 can be effectively reduced in this way.

About the pin 243 of the stop element 241 an end stop is predetermined, which comes at a predetermined compression of the damping element 240 axially along the longitudinal axis L with the rear wall 203 of the housing sleeve 201 into abutment. About this end stop in the form of the pin 243 thus the compression of the damping element 240 is limited in the axial direction, which may be favorable for the life of the damping element 242.

Basically, damping via a damping assembly 24 at the motor housing 20 associated, first axial end 21 1 of the drive shaft 21 for effective reduction of vibration excitation be sufficient. In a modified embodiment, shown in an embodiment in Fig. 7, a further, second damping assembly 25 with a damping element 250 and a stop element 251 (which may be configured as described above for the damping element 240 and the stop element 241) but also on the axially opposite end 212 of the drive shaft 21 may be provided for damping support of the drive shaft 21 relative to the transmission housing 30, so that the drive shaft 21 is axially damped on both sides, both relative to the motor housing 20 and to the transmission housing 30.

As already mentioned, however, such a further, second damping assembly 25 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 different gear than the one described here, for example, a planetary gear or the like, are 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 drive device

10 rope

1 1 guide rail

1 10, 1 1 1 deflection

12 drivers

13 window pane

2 motor unit

20 motor housing

200 engine pot

201 housing socket

202 fixing section (flange)

203 rear wall

21 drive shaft

210 bearing element

21 1, 212 Axial end

22 drive screw

23 electric motor assembly

230 stator

231 rotor

232 commutator

24 damping assembly

240 damping element

241 starting element

242 bodies

243 cones

244 survey

245 deepening

25 damping assembly

250 damping element

251 starting element

3 gear unit

30 gearbox

31 output element

32 drive wheel

33 control electronics 34 connection

4 carrier element (subframe)

L longitudinal axis

Claims

claims

Drive device (1) for a window, with

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 extending about the longitudinal axis (L) to the motor housing (20) rotatable drive shaft (21), and

a gear unit

(3), which has a transmission housing (30) connected to the motor housing (20) and an output element (31) which can be driven via the drive shaft (21) for outputting an adjusting force, characterized in that the motor unit (2) comprises a motor housing (2). 20) arranged damping assembly (24) with a made of an elastic material damping element (240) for supporting a first axial end (21 1) of the drive shaft (21) relative to the motor housing (20).

Drive device (1) according to Claim 1, characterized in that the motor housing (20) has a motor housing (200) at least partially enclosing the electric motor assembly (23) and a housing bushing (201) projecting axially from the motor housing (200), wherein the damping assembly ( 24) is received in the housing bushing (201).

Drive device (1) according to claim 2, characterized in that the motor pot (200) via a fastening device (202) on a side remote from the housing bushing (201) side with the transmission housing (30) is connected.

4. Drive device (1) according to one of claims 1 to 3, characterized in that the damping element (240) is annular.

5. Drive device (1) according to claim 4, characterized in that the damping element (240), viewed circumferentially about the longitudinal axis (L), meandering with axially projecting, circumferentially juxtaposed elevations (244) and between the elevations (244) arranged recesses (245) is formed.

6. Drive device (1) according to one of the preceding claims, characterized in that the damping element (240) is made of a rubber material.

7. Drive device (1) according to any one of the preceding claims, characterized in that the damping assembly (24) has a stop element (241) on which the drive shaft (21) is supported and the over

Damping element (240) relative to the motor housing (20) is supported.

8. Drive device (1) according to claim 7, characterized in that the contact element (241) has a body (242) and an axially along the longitudinal axis (L) of the body (242) projecting pin (243), wherein the damping element ( 240) is arranged on the pin (243).

9. Drive device (1) according to one of the preceding claims, characterized in that a first axial end (21 1) of the drive shaft (21) facing away, the second axial end (212) of the drive shaft (21) via a further damping assembly (25). is supported with a made of an elastic material further damping element (250) relative to the transmission housing (30).

10. Drive device (1) according to one of the preceding claims, characterized by a on the drive shaft (21) arranged drive screw (22) and rotatably mounted in the transmission housing (30), with the output member (31) operatively connected drive wheel (32) with the drive screw (22) in such Active connection is that the drive wheel (32) by a rotational movement of the drive screw (22) can be driven.

Drive device (1) according to one of the preceding claims, characterized in that the first axial end (21 1) via a bearing element (210) in the motor housing (20) is mounted.