Wiper motor for the cleaning of vehicle windows and windscreen wiper system

Abstract

The invention relates to a wiper motor (10) for the cleaning of vehicle windows, with an output element (17) rotatable about an axis (19), wherein in the output element (17) at a distance (a) the first axis (19) a bearing mount (25) is constructed for a drive lever (30) for driving a wiper shaft (11), wherein the wiper shaft (11) is pivotably mounted in a further axis (16) arranged at least substantially parallel to the axis (19) of the output element (17), and wherein the drive lever (30) is received with an extension (35) in a clamping manner in the bearing mount (25) and extends at least substantially in a plane arranged perpendicularly to the axes (16, 19). According to the invention, it is provided that the extension (35) has a fastening region (36) in the shape of a spherical segment, which cooperates with the bearing mount (25), and that the extension (35) is pivot able about a center point of the fastening region (36).

Claims

1. A wiper motor for the cleaning of vehicle windows, comprising: an output element rotatable about an axis, wherein in the output element, at a distance from the axis, a bearing mount is constructed for a drive lever for driving a wiper shaft, wherein the wiper shaft is pivotably mounted in a further axis arranged at least substantially parallel to the axis of the output element, wherein the drive lever is received with an extension in a clamping manner in the bearing mount and extends at least substantially in a plane arranged perpendicularly to the axes, and wherein the extension has a fastening region in the shape of a spherical segment, which cooperates with the bearing mount, and the extension is pivotable about a center point of the fastening region.

2. The wiper motor according to claim 1, wherein at least the extension and the output element in the region of the bearing mount consist of materials of different hardness.

3. The wiper motor according to claim 2, wherein the output element is a gear wheel consisting of plastic and that the extension consists of steel.

4. The wiper motor according to claim 1, wherein the bearing mount is constructed cylindrically.

5. The wiper motor according to claim 1, wherein the drive lever in an additional axis, which is arranged parallel to the further axis, is pivotably mounted in a lever connected in a torque-proof manner with the wiper shaft.

6. A windscreen wiper system for a rear window of a motor vehicle with a wiper motor according to claim 1.

7. The wiper motor according to claim 1, wherein the fastening region of the bearing mount is such that an external diameter of the bearing mount is smaller than an internal diameter of the bearing mount, and wherein the extension has a corresponding shape.

8. The wiper motor according to claim 1, wherein the motor rotates forward.

9. The wiper motor according to claim 1, wherein the output element is round.

Description

(1) Further advantages, features and details of the invention are disclosed from the following description of preferred exemplary embodiments and with reference to the drawings, in which:

(2) FIG. 1 shows a partial sectional view of a wiper motor for a windscreen wiper system of a rear window of a motor vehicle in a perspective view,

(3) FIG. 2 shows the components of the wiper motor essential to the invention according to FIG. 1 in a perspective individual view, in the state where they are not yet joined together, and

(4) FIG. 3 shows a longitudinal section through the region of an output element of the wiper motor when the drive lever is mounted on the output element.

(5) The same elements and/or elements having the same function are provided in the figures with the same reference numerals.

(6) The wiper motor 10 shown in FIG. 1 is a component of a windscreen wiper system 100 for a rear window of a motor vehicle. In particular, the wiper motor 10 serves for the reciprocal motion of a wiper blade which is not shown in the figures and which is connected via a wiper arm to a wiper shaft 11 which is visible in FIG. 2, wherein the wiper shaft 11 is rotatable in an axis 16.

(7) The wiper motor 10 has an electric motor 12, the drive shaft 13 thereof protruding with a toothed region 14 into a gear housing 15 which is configured, in particular, in multiple parts. Inside the gear housing 15, an output element 17 which consists of plastic and which is in the form of a gear wheel 18 is rotatably mounted in a first axis 19. A toothed portion 21 configured on the outer circumference of the gear wheel 18 meshes with the toothed region 14 of the drive shaft 13 of the electric motor 12. At a distance a from the first axis 19, a bearing mount 25 is configured in the gear wheel 18. The bearing mount 25 is formed by a bore 26 which is cylindrical in cross section and which has a second axis 27 which is arranged parallel to the first axis 19. The axes 16, 19 and 27 are all arranged parallel to one another.

(8) The drive shaft 13 is connected to the output element 17 in the region of the bearing mount 25 by two levers 29, 30 which are together connected together in a further axis 28 and which form a lever mechanism 24. The two levers 29, 30 which are arranged parallel to one another are preferably configured as parts which have been stamped from a metal plate and which have a planar cross section. The lever 30 which is arranged so as to be operatively connected to the bearing mount 25, the plane of said lever extending perpendicular to the axes 16, 19 and 27, has an extension 35 connected to the lever 30 on the side facing the bearing mount 25, said extension being configured to be substantially pin-shaped.

(9) On the side remote from the lever 30 the extension 35 has a fastening region 36 which is configured in the shape of a spherical segment, the (external) diameter D thereof being slightly larger than the (internal) diameter d of the bearing mount 25. The lever 30 and/or the extension 35 is pivotably mounted about the centre point of the fastening region 36, which is ensured, in particular, by the intermediate portion 38 of the extension 35 arranged between the fastening region 36 and the lever 30 in the region of the bearing mount 35 having an (external) diameter D.sub.1 which is (considerably) smaller than the diameter D of the bearing mount 25. The lever 29 which is connected to the wiper shaft 11 is connected in a torque-proof manner with the wiper shaft 11.

(10) During the rotation of the drive shaft 13 of the electric motor 12 in one direction, the gear wheel 18 is rotated clockwise, for example, in the direction of the arrow 39. By the arrangement of the bearing mount 25 at the distance a from the first axis 19 and the disclosed connection of the wiper shaft 11 via the two levers 29, 30 to the bearing mount 25 and/or the gear wheel 18, in this case a reciprocal motion of the wiper shaft 11 and thus also of the wiper blade (not shown) connected to the wiper shaft 11 is achieved in the direction of the double arrow 40.

(11) The wiper motor 10 described above and/or the windscreen wiper system 100 may be altered and/or modified in any manner without deviating from the invention.

LIST OF REFERENCE NUMERALS

(12) 10 Wiper motor 11 Wiper shaft 12 Electric motor 13 Drive shaft 14 Toothed region 15 Gear housing 16 Axis 17 Output element 18 Gear wheel 19 Axis 21 Toothed portion 24 Lever mechanism 25 Bearing mount 26 Cylindrical bore 27 Axis 28 Axis 29 Lever 30 Lever 35 Extension 36 Fastening region 38 Intermediate portion 39 Arrow 40 Double arrow a Distance d Diameter D Diameter D.sub.1 Diameter 100 Windscreen wiper system