EP1856361B1 - Window lifter for a motor vehicle - Google Patents

Abstract

The window lifter has a guide rail (1) and toothed rack (3) for engagement with a pinion of a follower drive unit (2) which has a drive motor (8) and a guide and gearing unit (4) which houses both the pinion and the roller body. A support (9) holds both the drive motor and the guide and gear unit. The guide and gear unit has an electronic area (13) with electronics for detecting the movement of the motor shaft (18).

Description

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

The US 5,806,244 shows a window lift with two racks. The opposite racks cooperate with a pinion, which mesh with each other. One of the pinions is coupled to a drive. The window pane is moved with the motor along the rack system. The system pinion - racks offers u. U. insufficient precise guidance for a window.

From the DE 43 40 013 A1 a window regulator is known in which a guide rail has a rack toothing, which cooperates with a pinion in a driver drive unit. The guide rail has an angle which extends in the direction of movement of the driver drive unit and which corresponds to guide surfaces of the driver drive unit surrounding the guide rail in the region of the angling sliding cooperates. The pinion is guided in relation to the rack toothing - likewise experiences the driver drive unit together with the disk carrying them a guide. The disc to be lifted and lowered is attached to the top of the driver drive unit directly to the drive motor.

From the DE 40 05 759 A1 is a window is known, in which the driver drive unit is guided via rolling elements with respect to a toothed guide rail.

Object of the present invention is therefore to develop such a window lift on.

This object is achieved by the features of claim 1. Further developments of the invention will become apparent from the respective dependent claims.

• einen Antriebsmotor,
• eine das Ritzel sowie den wenigstens einen Rollkörper aufnehmende Führungs- und Getriebeeinheit, und
• einen sowohl Antriebsmotor als auch die Getriebeeinheit aufnehmenden Träger.

The invention proposes a window regulator for a motor vehicle, comprising a guide rail with a rack toothing, along which a disk-carrying driver drive unit with a meshing with the rack gear pinion is movable, and in which the driver drive unit via rolling against the guide rail is, wherein the driver drive unit comprises the following modules:

• a drive motor,
• a the pinion and the at least one rolling body receiving guide and gear unit, and
• a both drive motor and the transmission unit receiving carrier.

According to the invention, an advantageous guidance of the pinion with respect to the rack toothing results from the fact that at least one rolling element is arranged parallel to the plane of the pinion tooth meshing pinion and the rolling body cooperates with a parallel to the rack teeth guide surface and additionally the rolling body with the meshing with the rack teeth Pinion is coupled. The rolling guide of the pinion results in a defined interaction of the teeth of the rack and pinion.

On the one hand, the invention provides a spatial-functional delimitation of the individual assemblies, and on the other hand, their integration into a variable and optimal to the present Conditions customizable driver drive unit before. Thus, preferably the coupling of the drive motor to the gear unit via a coupling which connects the motor shaft of the motor with the shaft of the worm of the worm gear for the pinion. Thus, different motors can be connected in a simple manner. The worm cooperating with a worm is mounted on two end regions associated bearing points in the transmission. The coupling connecting the motor shaft to the screw is preferably constructed as a claw coupling in the manner of an Oldham coupling. As a result, both axial and radial tolerances are compensated.

According to one embodiment of the invention, it is provided that the worm and the worm wheel cooperating with the worm are accommodated in an encapsulated region of the guide and gear unit. This area has permanent lubrication and is sealed against the guide and gear unit.

Preferably, the invention is designed when the worm gear is not self-locking and the worm wheel is connected via a wrap spring brake with the meshing with the teeth of the guide rail pinion. A torque exerted by the pinion on the wrap spring spreads the wrap spring against a brake pot - the Reibgesperre locks. A torque exerted by the worm wheel on the wrap spring lifts their locking effect - the torque can be transmitted to the pinion.

The guide and gear unit preferably has an electronics area which is arranged in the region of the coupling connecting the motor shaft to the worm. The electronics housed in the electronics area can detect the wave motion via a Hall sender and a ring magnet attached to the shaft of the worm. From this signals for controlling the drive for anti-trap protection and the like can be derived. In this electronics area but also an electronics can be accommodated, which determines a magnetic track on the guide rail directly the absolute position of the driver drive unit and thus the disc to be lifted and lowered.

Preferably, the drive motor and coupled with the drive torque guide and gear unit are integrated directly in the carrier receiving these units. The disc to be lifted and lowered here is arranged above the carrier and is thus substantially above the motor shaft or in the plane of the worm wheel. This results in a favorable space utilization - the distance between the front of the driver drive unit and the back of the guide rail can be made relatively flat.

The carrier housing the drive motor and the guide and gear unit is formed according to an embodiment of the invention in a section as a half of the guide and gear unit and has here the bearings / supports for the rolling elements, the pinion and the pinion driving worm wheel. Also, in this area, the shots for the bearing bearing the screw are integrated. Over a Cover is the Wälzbereich worm - worm wheel opposite to the area in which rolling body and clutch are separated.

It is preferably provided that the cooperating with the rolling elements guide surface is formed as a perpendicular to the plane of the guide rail extending surface. In particular, two mutually parallel, each cooperating with at least one rolling body guide surfaces are provided. As a result, a precise guidance of the pinion relative to the rack toothing is possible. The rolling elements may have a convex, concave or conical, cooperating with the guide surface tread.

According to one embodiment of the invention it is provided that the one or more rolling bodies are each mounted about a rigid axis relative to the driver drive unit. To compensate for tolerances can be provided here to keep rolling elements with different diameters ready and to use exactly the rolling body, the rolling body pairing, in which there is a play-free guidance of the driver drive unit. Further education can also be provided that the one or more rolling bodies are resiliently mounted relative to the driver drive unit. The rolling elements are thus adjusted backlash against the guide rail.

An embodiment in which the running surface of the rolling body has a softer / harder material than the material of the guide rail results in a low-wear running of the rollers and prevents greater noise development. By a suitably chosen material pairing also a rolling of the rolling body is guaranteed - prevents sliding of the rollers on the guide surface.

A preferred embodiment of the invention provides that the driver drive unit can be equipped with pinions of different diameters and, correspondingly, with rolling bodies of corresponding diameter. So can the choice of the pinion diameter desired gear ratios can be realized. Since, according to the Rüzeldurchmesser then the driver drive unit positioned differently to the guide rail, the compensation is carried out by using correspondingly large rolling body. Thus, a simple, customizable to different conditions packaging can be created.

Figur 1 - 5

den erfindungsgemäßen Fensterheber mit Führungsschiene,

Figur 6 - 10

der Antriebsmotor nebst Führungs- und Getriebeeinheit,

Figur 11 - 14

das Ritzel sowie dessen Verbindung mit dem Schneckenrad,

Figur 15 - 18

den erfindungsgemäßen Fensterheber bzw. Komponenten in Explosionsdarstellung,

Figur 19

eine Rückenansicht einer Mitnehmer-Antriebseinheit des Fensterhebers aus den Figuren 1 bis 5.

Furthermore, the explanation of an embodiment of the invention with reference to the drawings. It shows:

Figure 1-5

the window regulator according to the invention with guide rail,

Figure 6-10

the drive motor together with the guide and gear unit,

FIGS. 11-14

the pinion and its connection to the worm wheel,

FIGS. 15-18

the window lifter or components according to the invention in exploded view,

FIG. 19

a rear view of a driver drive unit of the window of the FIGS. 1 to 5 ,

The Figures 1 - 5 show a preferably made of plastic guide rail 1, along which a driver drive unit 2 is movable. The guide rail 1 has a toothing 3, which cooperates with a pinion 30, not shown here, in a guide and gear unit 4 of the driver drive unit 2. Furthermore, two guide surfaces 5, 6 are integrally formed on the guide rail 1, wherein one of these guide surfaces 6 extends parallel to the toothing 3. The guide surface 6 lies exactly on the pitch circle of the interacting with the teeth 3 pinion 30 (FIG. FIG. 11 . 12 ). The lower end of the guide rail 1 is associated with an end stop 7 with an elastic element.

Drive motor 8 and the guide and transmission unit 4 are received by a carrier 9 designed as a molded part. The rotor housing of the drive motor 8 (pole pot) is hereby embedded in an opening 10 of the carrier 9 designed in accordance with its outer dimension. The end of the drive motor 8 accommodating the spherical bearing of the motor shaft 18 is fixed to the carrier 9 via a latching receptacle 11.

The insertable into the carrier 9 bearing plate 12 of the guide and transmission unit 4 has a receptacle of an electronics area 13 with plug-in connection 13.1, which is closed by a lid 14 together with seal via locking elements. Instead of a plug connection 13.1, a ribbon cable or a ribbon cable connected directly to the circuit board 15 can also be led out here. FIG. 1 shows in this case closed by means of cover 14 electronics area 13, FIG. 2 and 3 the electronics area 13 with the cover 14 removed. In this electronics area 13 a board 15 is accommodated with an electronics 16, wherein in FIG. 3 the upper board 15 removed and thus only the components of the electronics 16 is shown. The electronics 16 accommodated in the electronics area 13 detect the movement of the motor shaft 18 via a ring magnet 17, which is explained below. A second signal transmitter system also interacts with a magnetic signal track 19 for detecting the absolute position of the driver drive unit 2. The cover 14 of the electronics area 13 has a circumferential seal which cooperates with the inner wall of the receptacle of the electronics area 13 (FIG. FIG. 17 . 18 ).

The recording of the electronics area 13 is located on a bearing plate 12 of the guide and gear unit 4. This bearing plate 12 is, as in FIG. 4 . 5 and 6 shown removable from the carrier 9. The guide and gear unit 4 of the carrier 9 receives three individual, with the two guide surfaces 5, 6 of the guide rail 1 cooperating rolling body 20, 21, 22. The motor shaft 18 of the drive motor 8 is coupled via a jaw clutch 23 with elastic intermediate layer with a screw 24 - whose shaft 25. Due to the elastic intermediate layer between the two jaws of the coupling 23 there is a tension of the motor shaft 18 and the shaft 25 of the worm 24. Thus, positional tolerances of the two shafts 18, 25 are compensated without play. On the shaft 25 associated part of the clutch 23 is a ring magnet 17, which cooperates with a signal generator of an electronic unit, not shown here.

The two ends of the screw 24 - the shaft 25 - are rotatably and axially supported in the guide and transmission unit 4 (the bearing plate 12) via a respective bearing 26, 27 received. With the worm 24 meshes a worm wheel 28, wherein the system worm 24 - worm wheel 28 is not designed to be self-locking to achieve a good efficiency. For receiving forces exerted on the driver drive unit 2 (eg, the weight of the disc), the worm 24 acts via a wrap spring 29 with the in FIG. 7 illustrated pinion 30 together. The pinion 30 has parallel to a roller body surface 31, which with the next to the teeth 3 extending Guide surface 6 cooperates ( Figure 1-5 ). With this guide surface 6, the rolling body 20 also cooperates ( FIG. 7 ).

FIG. 7 shows the storage of the rolling elements 20, 21, 22 on the bearing plate 12 of the guide and gear unit 4. The storage takes place via integrally formed bearings 33. The pinion 30 and the parallel to the pinion 30 mounted and coupled rolling body surface 31 are located on the guide rail 1 facing side of a made of elastic material sealing element 32 of the bearing plate 12. Under this sealing element 32 is the worm wheel 28 together with the mounted at both ends in the bearings 26, 27 shaft 25 of the screw 24 in a grease. The elastic sealing element 32 also further fixes the bearings 26, 27 without play in their correspondingly shaped receptacles of the bearing plate 12 and causes a noise insulation.

FIG. 8 shows the bearing plate 12 of the guide and transmission unit 4 with removed pinion 30 and the sealing element 32nd Das in FIGS. 8 . 9 and 10 not shown pinion 30 together with roller body surface 31 is rotatably mounted on a pin 43 of the bearing plate 12 of the guide and gear unit 4. This pin 43 passes through an opening of the worm wheel 28, in which the shaft 34 of the pinion 30 is rotatably inserted ( FIG. 11 and 12 ). At the front, the pinion 30 has two claws 35, which dive into two recesses 36 of the worm wheel 28 in the manner of a claw coupling. A claw 35 of the pinion 30 cooperates in a recess 36 of the worm wheel 28 with the bent ends of a seated on a collar 37 of the worm wheel 28 wrap 38 ( FIG. 13 ). Pinion 30, the roller body surface 31, the collar 37 and the claws 35 form a preferably one-piece unit. The wrap spring 38 cooperates via its outer circumference with a metal band forming the brake pot 39 ( FIG. 14 ), which in turn is embedded in a correspondingly shaped receptacle of the bearing plate 12 of the guide and transmission unit 4 ( FIG. 10 ). The metal band of the brake pot has a small thickness, so that this can fit snugly against the cylindrical receptacle in the bearing plate 12. Wrap spring 38 and metal band of the brake cup 39 so form the wrap spring brake 40 of the driver drive unit.

The FIGS. 15-18 show in exploded view, the driver drive unit 2 with and without guide rail 1. The bearing plate 12 has a flange portion 41 for receiving the drive motor 8. FIG. 18 represents the components pinion 30, wrap spring 38, brake pot 39, bearing plate 12 and the lid 14 of the electronics area 13. Die FIGS. 15 and 16 show that the carrier 4 on the guide rail 1 facing Side each having a rail rear handle 42 in the form of a trained as a hook area. The driver drive unit 2 is thus fixed perpendicular to the plane of the guide rail 1. In the rear view of the driver drive unit 2 according to FIG. 19 the rail rear grips 42 are shown - these are located in the region of the recesses in the carrier for the roller 20 and the pinion 30 and opposite in the range of the drive motor 8. The carrier 9, the bearing cap 12, the cover 32 of worm 24 and worm wheel 28 and the Lid 14 of the electronics area are made of plastic.

LIST OF REFERENCE NUMBERS

1

guide rail

2

Pickup drive unit

3

gearing

4

Guide and gear unit

5

guide surface

6

guide surface

7

end stop

8th

drive motor

9

carrier

10

opening

11

latching receptacle

12

bearing plate

13

electronics sector

13.1

plug-in connection

14

cover

15

Board (electronics 16)

16

electronics

17

ring magnet

18

motor shaft

19

signal track

20

roll body

21

roll body

22

roll body

23

clutch

24

slug

25

wave

26

camp

27

camp

28

worm

30

pinion

31

Roll body surface

32

sealing element

33

camp

34

shaft

35

claw

36

Recess (worm wheel)

37

Federation

38

wrap

39

brake pot

40

wrap spring

41

flange

42

Rail rear grip

43

spigot

Claims (27)

1. A window lifter for a motor vehicle, comprising a guide rail (1) with a rack toothing (3), along which a follower drive unit (2) of the window lifter, which carries the pane, can be moved by means of a pinion (30) which meshes with the rack toothing (3), and the follower drive unit (2) is guided in relation to the guide rail (1) via rolling bodies (20, 21, 22, 31), wherein the follower drive unit (2) has the following subassemblies:

   - a drive motor (8),

   - a guide and gearing unit (4) which holds the pinion (30) and the at least one rolling body (20, 21, 22, 31), and

   - a support (9) which holds drive motor (8) and the guide and gearing unit (4),

   characterized
   in that at least one rolling body (31) is arranged at the pinion (30) in a way parallel to the plane of the pinion (30), which meshes with the rack toothing (3), and works together with a guiding plane (6) which extends parallel to and at the side of the rack toothing (3), and in that additionally the rolling body (31) is coupled to the pinion (30), which meshes with the rack toothing (3), and has as diameter that of the reference circle of the pinion (30).
2. The window lifter as claimed in claim 1, characterized in that the guide surface (5, 6) which interacts with the rolling body (20, 21, 22, 31) is designed as a surface which runs perpendicularly with respect to the plane of the guide rail (1).
3. The window lifter as claimed in claim 1 or 2, characterized in that two guide surfaces (5, 6) which run parallel to each other and each interact with a rolling body (20, 21, 22, 31) are provided.
4. The window lifter as claimed in one of the preceding claims, characterized in that the rolling body (20, 21, 22, 31) has a cylindrical or convexly, concavely or conically designed running surface which interacts with the guide surface (5, 6).
5. The window lifter as claimed in one of the preceding claims, characterized in that the rolling body (20, 21, 22) is mounted resiliently in relation to the follower drive unit (2).
6. The window lifter as claimed in one of the preceding claims, characterized in that the running surface of the rolling body (20, 21, 22, 31) has a different hardness from the material of the guide rail (1).
7. The window lifter as claimed in one of the preceding claims, characterized in that the rolling body or the rolling bodies (20, 21, 22) lie in the plane of the pinion (30) which meshes with the rack toothing (3).
8. The window lifter as claimed in one of the preceding claims, characterized in that the follower drive unit (2) can be equipped with pinions (30) of different diameter and, correspondingly, with rolling bodies (20, 21, 22, 31) of corresponding diameter.
9. The window lifter as claimed in one of the preceding claims, characterized in that the guide and gearing unit (4) is designed as a bearing plate (12) which mounts the at least one rolling body (20, 21, 22, 31) together with the pinion (30).
10. The window lifter as claimed in one of the preceding claims, characterized in that the guide and gearing unit (4) has an electronic unit region (13).
11. The window lifter as claimed in claim 10, characterized in that the electronic unit region (13) can be closed by means of a cover (14) and latching connection.
12. The window lifter as claimed in claim 10 or 11, characterized in that the electronic unit region (13) has an electronic unit (15, 16) which detects the movement of the motor shaft (18).
13. The window lifter as claimed in claim 10, 11 or 12, characterized in that the electronic unit region (13) has an electronic unit (16) which detects the position of the follower drive unit (2) with respect to the guide rail (1).
14. The window lifter as claimed in claim 13, characterized in that the electronic unit (16) interacts with a signal track (19) on the guide rail (1).
15. The window lifter as claimed in one of the preceding claims, characterized in that the guide and gearing unit (4) has a worm wheel (28) which is coupled to the pinion (30), and a worm (24) which meshes with the worm (24) and is driven by the drive motor (8).
16. The window lifter as claimed in claim 15, characterized in that the drive motor (8) is coupled to the shaft (25) of the worm (24) via a coupling (23).
17. The window lifter as claimed in one of the preceding claims, characterized in that the guide and gearing unit (4) has a flange region (41) which holds the drive motor (8).
18. The window lifter as claimed in claim 15 or 16, characterized in that worm (24) and worm wheel (28) are arranged in a region of the guide and gearing unit (4) that is encapsulated by means of a sealing element (32).
19. The window lifter as claimed in claim 15, 16 or 18, characterized in that the worm - worm wheel system (24, 28) is not of self-locking design and the drive pinion (30) is assigned a brake (40).
20. The window lifter as claimed in claim 19, characterized in that the brake is designed as a wrap spring brake (40).
21. The window lifter as claimed in claim 20, characterized in that wrap spring brake (40) has a brake cup (39) which is composed of a metal strip and can be inserted into a corresponding region of the bearing plate (12).
22. The window lifter as claimed in one of the preceding claims, characterized in that the support (9) has an opening (10) which holds the housing of the drive motor (8).
23. The window lifter as claimed in claim 22, characterized in that the drive motor (8) is fixed on the support (9) by means of a latching connection.
24. The window lifter as claimed in one of the preceding claims, characterized in that the follower drive unit (2) has rear-acting rail grips (42) which interact with the guide rail.
25. The window lifter as claimed in claim 16, characterized in that the coupling (23) is designed as a claw coupling.
26. The window lifter as claimed in claim 25, characterized in that an element which is spring-elastic in the axial direction is arranged between the claws of the coupling (23).
27. The window lifter as claimed in claim 21, characterized in that the metal strip of the brake cup (39) has a small thickness.

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