Drive device, especially for wipers of motor vehicles

Details Drive device, especially for wipers of motor vehicles Drive device, especially for wipers of motor vehicles

1992-05-12

1993-06-08

Hannon, Thomas R.

Bearings

Rotary bearing

Plain bearing

384151, F16C 3374

Patent

active

052173097

DESCRIPTION:

BRIEF SUMMARY
INTRODUCTION

The present invention relates to a driven device, especially for wipers of motor vehicles, with a shaft extending a front face of a bearing housing of the drive device and with a cylindrical slide bearing which is inserted into the bearing housing at a little distance from the front face of said bearing housing, and with a ring groove limited by the slide bearing, the bearing housing and the shaft.


BACKGROUND OF THE INVENTION

Such a drive device is known from serial usage in motor vehicles. In this known drive device the bearing housing is part of a gear housing flanged onto an electric motor. The shaft extending the front face of the bearing housing and driven rotatingly or in pendulum motion by the electric motor via gear members located in the gear housing serves as a wiper shaft carrying a wiper arm with a wiper blade. The slide bearing is pushed into the bearing housing up to a stop to such an extent that its distance from the front face of the bearing housing is only little. A disadvantage of the known drive device is that it requires a complicated sealing of the ring groove between the bearing housing and the shaft; for in the known drive device it is provided that a sealing ring is inserted into the ring groove between the shaft and the bearing housing. In order to prevent the sealing ring from getting out of the ring groove, a securing ring engaging into a groove of the shaft is necessary. The sealing of the ring groove between the wiper shaft and the bearing housing, which sealing is achieved by the sealing ring and the securing ring inserted into the ring groove causes relatively high manufacturing costs due to its two-part embodiment. Furthermore, it is difficult to assemble the known sealing concerning the ring groove of such a drive device because it is always difficult and not easily automated to adjust the securing ring in perpendicular direction to the axis of the shaft.


BRIEF DESCRIPTION OF THE INVENTION

In order to avoid these disadvantages the object of the invention is to develop a drive device of the kind mentioned at the beginning in such a way that a simple sealing which can easily and at low costs be realized is obtained.
This object is achieved according to the invention by way of a bush firmly fixed onto the bearing housing and made of elastic material, which bush closes the ring groove between the bearing housing and the wiper shaft and comprises a radially projecting sealing flange at its end turned off from the bearing housing, which sealing flange engages into a ring groove of the shaft.
By these measures according to the invention the ring groove between the shaft and the bearing housing of the drive device is sealed in an especially simple manner: The bush according to the invention fulfills--in an especially advantageous manner--both the function of the sealing ring and the securing ring of the known drive device. The advantage of the integral embodiment of the sealing according to the invention is that this embodiment can be manufactured at considerably lower costs and mounted in a simpler way than a two-part sealing consisting of a sealing ring and a securing ring. The assembly of the bush according to the invention in the ring groove can especially simply be automated because said assembly can especially simple be carried out by axially pushing the bush onto the shaft and pressing it into the bearing housing. Thus it is of an advantage that the sealing ring need not be adjusted in an awkward manner. The sealing flange which is provided at the end of the bush according to the invention turned off from the bearing housing and radially projecting towards the inside prevents--in a secure and reliable way also in this area--in cooperation with the ring groove of the shaft moisture from entering the bearing housing, what would be of a disadvantage. A further effect of the sealing flange of the bush according to the invention, which sealing flange engages into the ring groove is that the bush is prevented from axially shifting on the shaft.
In a preferred e

REFERENCES:
patent: 3241892 (1966-03-01), Oishei
patent: 3845998 (1974-11-01), McElhinney et al.
patent: 4660996 (1987-04-01), Marshall
patent: 4750878 (1988-06-01), Nix et al.
patent: 4806024 (1989-02-01), Tanaka et al.

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