DE202008001763U1 - Drive unit for a power window - Google Patents

Abstract

Drive unit (1) for an electric window lifter, with a gear housing (4) accommodating a worm gear (5), with an electric drive motor (2), with a drive shaft coupling the drive motor (2) with a worm (6) of the worm gear (5) (3), on which a ring magnet (27) is applied, and with a printed circuit board (17) having a Hall sensor (27) corresponding Hall sensor (26), wherein the circuit board (17) obliquely to the axis (30) of the Drive shaft (3) in the transmission housing (4) is arranged.

Description

The The invention relates to a drive unit for a power windows of a motor vehicle.

at an electric window of a motor vehicle is often a Cable used with an electric drive unit. in this connection usually drives an electric motor over a worm gear on a cable drum. At the cable drum are the both ends of a steel cable so struck that when turning one end open and the other is unwound. It pulls usually the pull rope over a Bowden cable and pulleys two window fasteners running on guide rails, whereas the rope end wound up without tension on the cable drum becomes.

Frequently such an electric window provided with a pinch protection. exceeds the drive torque to close of the window depending from the window position a certain limit, so will from an obstacle. The window must be reversed again a piece to release the obstacle. As input for the anti-trap is usually an information about the position of the window is needed. Based on the position of the window is z. B. determined if a Obstacle is present or the window has reached its end position. The The position of the window usually becomes determined by the revolutions of the drive shaft of the electric motor. The number of revolutions is z. B. measured by means of a Hall sensor, which corresponds to a ring magnet mounted on the drive shaft.

Of the Hall sensor is ordinary mounted on a printed circuit board integrated into the drive unit, on which the output signal of the Hall sensor is preprocessed, and the one interface for transmission this output signal to a trained for detecting the Einklemmfalls Has electronics.

The Printed circuit board is usually at right angles to the drive shaft mounted to the Hall sensor as possible to be positioned close to the ring magnet. This will be a comparatively high space requirement for causes the drive unit.

Of the Invention is therefore the object of a drive unit specify that requires a particularly small space.

These The object is achieved by the features of claim 1. Thereafter, the drive unit comprises a gearbox with a worm gear, as well as an electric drive motor, the over a drive shaft coupled to a worm of the worm gear is. On the drive shaft coaxially a ring magnet is applied. Furthermore, the drive unit comprises a printed circuit board, the one Having Hall sensor corresponding to the Hall sensor. there the printed circuit board is slanted arranged to the axis of the drive shaft in the transmission housing.

By the slope Arrangement, the space in the transmission housing used particularly well become. Thus, the transmission housing and thus the drive unit be built very small.

In an advantageous embodiment the invention, the ring magnet is conical. Conveniently, is the printed circuit board with its surface at an angle to the axis the drive shaft inclined, the half cone opening angle of the ring magnet equivalent. In this case, the circuit board is usefully such arranged that the Hall sensor located thereon in the immediate vicinity of the ring magnet located. Since the angle of attack of the circuit board half the cone opening angle of the Ring magnet is equivalent, which is mounted on the circuit board Hall sensor with its ring magnet facing side substantially parallel to the lateral surface aligned to the cone. By this arrangement, despite the oblique installation the PCB good signal transmission from the ring magnet reached to the Hall sensor. A cone opening angle of the ring magnet of about 45 ° proved to be an advantageous dimensioning.

Prefers the ring magnet is applied to the drive shaft such that its smaller diameter end facing the drive motor. Alternatively or in addition the ring magnet is preferably applied on that side of the drive shaft, where the drive shaft exits the drive motor. The ring magnet is thus located directly or at a short distance from the drive motor on the drive shaft.

In an advantageous embodiment has the gearbox one - in particular made of plastic - housing shell on, on the side of the drive shaft an opening, in particular for insertion the circuit board has. This opening is with a lid provided in which the circuit board is partially received. These Design favors the particularly compact design of Drive unit.

In a further advantageous embodiment of the invention, the transmission housing on the side of the drive shaft on an interface, with the optional and against each other interchangeable Electronic module or one or more cable connection adapters are contacted. This uniform interface for different modules or plugs advantageously creates a kind of modular system. For example, based on drive motors of different power classes and / or different brush holders, drive units for a large number of applications can be realized by standardizing the interface. In particular, a variant with an integrated electronic module is provided in which the electronic module is plugged directly onto the interface. In this case, the electronic module on the one hand contacts to the circuit board ("sensor contacts"), with which in particular the signal of the Hall sensor is tapped, and on the other hand contacts to the terminals of the electric drive motor ("electrical contacts"). The electronic module implements in particular a anti-trap protection of the window regulator.

In a further variant is provided on the interface the Cable adapter for connecting cables. there a first cable adapter for sensors is provided, which via sensor contacts contacted the circuit board. about the cable of the first cable connection adapter is in particular the Signal from the Hall sensor transmitted. A second cable connection adapter for electrical has electrical contacts for contacting the motor terminals. The two cable connection adapters can optionally used individually or in combination with each other. In particular, you can When using both cable adapters, connect the cables to one external electronics module can be connected, so here too For example, a pinch protection can be realized. advantageously, can then by using an external electronic module of the immediately in the door needed Space to be reduced even further. Conveniently, the interface integrated into a functioning as a cover interface attachment of the transmission housing.

Prefers has the interface at its remote from the transmission housing Connection side a sealing surface on, with a sealing element of the electronic module or the or the cable connection adapter corresponds. For a wet room suitable installation is the electronics module or the or the cable connection adapter for example plugged in using a suitable sealing ring. For a dry room application The drive unit is the module or the or the cable connection adapter simply without a sealing element attached.

following is an embodiment of Invention explained in more detail with reference to a drawing. Show:

1 in a section the drive unit for a power window,

2 enlarged illustrated a section I off 1 .

3 in an exploded view, the drive unit, an electronic module, a corresponding to the electronic module sealing element, a cable connection adapter for sensors, a cable connection adapter for electrical, and a corresponding with the cable connection adapters sealing element.

each other corresponding parts and sizes are always provided with the same reference numerals in all figures.

1 shows a two-dimensional view of a - partially only schematically illustrated - section through a drive unit 1 for an electric window of a motor vehicle.

The drive unit 1 essentially comprises a drive motor 2 that with a drive shaft 3 is provided, and a transmission housing 4 in which a worm gear 5 is included.

The worm gear 5 includes a snail 6 on the drive shaft 3 is applied, and a worm wheel 7 which is in the snail 6 intervenes. The worm wheel 7 has a drive shaft 8th for driving a cable drum (not shown).

The gearbox 4 includes a housing made of plastic housing shell 9 whose shape is substantially similar to the shape of the worm gear 5 is adjusted. This has the housing shell 9 in the area of the worm wheel 7 approximately a disc shape that widens to one side about the drive shaft 3 with the snail 6 take.

In the disc-shaped area of the housing shell 9 is located on a front side, a first round opening 10 ( 3 ) for introducing the worm wheel 7 , This opening is with a disc-shaped housing cover 11 ( 3 ), which is a passage for the drive shaft 8th having.

On a straight narrow side of the housing shell 9 is the drive motor 2 Flanged, with the drive shaft 3 through an implementation 12 in the gearbox 4 protrudes. In the process, the drive shaft becomes 3 at her from the drive motor 2 opposite end in a storage 13 the housing shell 9 stabilized. The snail 6 is right next to the storage 13 on the drive shaft 3 on brought.

At its outer edge, the housing shell 9 three fastening straps 14 on, each with a hole 15 for fastening the drive unit 1 are provided in a vehicle door.

In the area of the drive shaft 3 has the housing shell 9 on a narrow side, a second, substantially rectangular opening 16 for introducing a printed circuit board 17 on.

The opening 16 is closed with a, approximately a cuboid cap forming lid, which subsequently as an interface attachment 18 is designated. With a seal 19 becomes the opening 16 suitable for wet rooms.

The in the housing shell 9 inserted circuit board 17 is partially from the housing shell 9 and partly from the interface attachment 18 added. For fixing the circuit board 17 are opposing grooves 20 in the housing shell 9 provided in the the printed circuit board 17 is inserted. In an alternative to the embodiment shown here is also conceivable, the circuit board 17 using in the gearbox 4 located pins in holes in the circuit board 17 engage, fasten.

Into the interface attachment 18 of the gearbox 4 is an interface 21 integrated. On his from the drive motor 2 facing away from the interface attachment 18 bushings 22 for sensor contacts 23 ( 3 ), with which contact with the circuit board 17 will be produced. On its side facing the drive motor, the interface attachment 18 bushings 24 for electrical contacts 25 ( 3 ) for controlling the drive motor 2 on, with which the motor terminals are contacted.

On the circuit board 17 there is a Hall sensor 26 , This Hall sensor 26 sits in the immediate vicinity of one on the drive shaft 3 mounted, corresponding ring magnets 27 , The ring magnet 27 located on the drive shaft 3 in the immediate vicinity of their wave exit 28 ,

In 2 are the Hall sensor 26 and the ring magnet 27 in an enlarged view of the section I from 1 to see: The ring magnet 27 is conical with a cone opening angle α of 45 °. Its in diameter smaller end 29 points in the direction of the drive motor 2 ,

The circuit board 17 is opposite the axis 30 the drive shaft 3 tilted at an angle β of 22.5 °. Due to the inclination of the circuit board 17 is the Hall sensor 26 with his the ring magnet 27 facing top 31 parallel to the cutting edge 32 the lateral surface of the ring magnet 27 ,

3 shows in an exploded view of the drive unit 1 , together with an electronics module 33 , one with the electronics module 33 corresponding sealing element 34 , a cable connection adapter 35 for sensors, a cable connection adapter 36 for electrics, as well as one with the cable connection adapters 35 . 36 corresponding sealing element 37 ,

As 3 can be seen, the interface attachment 18 at his from the gearbox 4 facing away from the top a bathtub-shaped sealing surface 38 on. The sealing surface 38 of the interface attachment 18 is with the bushings 22 for introducing the sensor contacts 23 , as well as with the bushings 24 for introducing the electrical contacts 25 Mistake.

the interface 21 is designed so that either the electronics module 33 or the cable connection adapter 35 for sensors and / or the cable connection adapter 36 can be connected for electrical.

The electronics module 33 indicates its in the infected state of the interface 21 facing bottom 39 on the one hand sensor contacts 23 , on the other hand electrical contacts 25 on. On one to the bottom 39 adjacent longitudinal side is the electronic module 33 with a plug outlet 40 over which the electronic module 33 is supplied with voltage.

For wet room applications, the sealing element 34 between the electronics module 33 and the sealing surface 38 trapped.

The cable connection adapter 35 for sensors indicates its in the infected state of the interface 21 facing bottom 41 sensor contacts 23 on, with which the circuit board 17 can be contacted. At its in the infected state of the interface facing away from the top 42 indicates the cable connection adapter 35 a plug outlet 43 for connecting cables.

Accordingly, the cable connection adapter 36 for electronics at its interface in the infected state 21 facing bottom 44 Electrical contacts 25 on, with which the motor terminals of the drive motor 2 can be contacted. At its in the infected state of the interface 21 opposite top 45 indicates the cable connection adapter 36 a plug outlet 46 for connecting cables.

For wet room applications is between the sealing surface 38 and each cable connection adapter 35 . 36 one each with the cable connection adapters 35 . 36 corresponding sealing element 37 brought in.

1

drive unit

2

drive motor

3

drive shaft

4

gearbox

5

worm gear

6

slug

7

worm

8th

drive shaft

9

shell

10

opening

11

housing cover

12

execution

13

storage

14

mounting tab

15

drilling

16

opening

17

circuit board

18

Interface essay

19

poetry

20

groove

21

interface

22

execution

23

sensor contacts

24

execution

25

Electrical contacts

26

Hall sensor

27

ring magnet

28

shaft outlet

29

The End

30

axis

31

top

32

cutting edge

33

electronic module

34

sealing element

35

Cable Adapter

36

Cable Adapter

37

sealing element

38

sealing surface

39

bottom

40

plug outlet

41

bottom

42

top

43

plug outlet

44

bottom

45

top

46

plug outlet

α

angle

β

angle

Claims (9)

Drive unit ( 1 ) for a power window, with a worm gear ( 5 ) receiving gear housing ( 4 ), with an electric drive motor ( 2 ), with a drive motor ( 2 ) with a snail ( 6 ) of the worm gear ( 5 ) coupling drive shaft ( 3 ), on which a ring magnet ( 27 ) is applied, and with a printed circuit board ( 17 ), one with the ring magnet ( 27 ) corresponding Hall sensor ( 26 ), wherein the printed circuit board ( 17 ) obliquely to the axis ( 30 ) of the drive shaft ( 3 ) in the transmission housing ( 4 ) is arranged. Drive unit ( 1 ) according to claim 1, wherein the ring magnet ( 27 ) is conical. Drive unit ( 1 ) according to claim 2, wherein the half cone angle (α) of the ring magnet ( 27 ) about the angle of attack (β) of the circuit board ( 17 ) with respect to the axis ( 30 ) of the drive shaft ( 3 ) corresponds. Drive unit ( 1 ) according to one of claims 2 to 3, wherein the ring magnet ( 27 ) has an opening angle (α) of its lateral surface of about 45 °. Drive unit ( 1 ) according to one of claims 2 to 4, wherein the ring magnet ( 27 ) on the drive shaft ( 1 ) is mounted so that its smaller diameter end ( 29 ) the drive motor ( 2 ) is facing. Drive unit ( 1 ) according to one of claims 1 to 5, wherein the ring magnet ( 27 ) directly or at a short distance to a shaft outlet ( 28 ) of the drive motor ( 2 ). Drive unit ( 1 ) according to one of claims 1 to 6, wherein the transmission housing ( 4 ) a housing shell ( 9 ), which on the side of the drive shaft ( 3 ) one with a lid ( 18 ) closed opening ( 16 ), wherein in the lid ( 18 ) the printed circuit board ( 17 ) is partially included. Drive unit ( 1 ) according to one of claims 1 to 7, wherein the transmission housing ( 4 ) on the side of the drive shaft ( 3 ) with an interface ( 21 ) is provided with the optional and mutually interchangeable an electronic module ( 33 ) or one or more cable connection adapters ( 35 . 36 ) are contactable. Drive unit ( 1 ) according to claim 8, wherein the interface ( 21 ) at its from the transmission housing ( 4 ) side facing away from a sealing surface ( 38 ), which with a sealing element ( 34 . 37 ) of the electronic module ( 33 ) or the cable connection adapter (s) ( 35 . 36 ) corresponds.