Worm, onto which a bearing stud is formed, especially for a wind

Details Worm, onto which a bearing stud is formed, especially for a wind Worm, onto which a bearing stud is formed, especially for a wind

1993-04-01

1995-04-25

Herrmann, Allan D.

Machine element or mechanism

Gearing

Directly cooperating gears

152503, 2989331, 2989332, F16H 116, F16H 5502

Patent

active

054088976

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND

The invention relates to a worm, especially for a worm gear of a windshield wiping system, onto which at least one bearing section is formed. When the worm is directly driven by an electric motor having a commutator which is doubly mounted, one of the bearings being situated between the worm and the commutator the bearing can only be slipped over the corresponding bearing section between the worm and the commutator, if the diameter of this bearing section exceeds the outside diameter of the worm so that the inside diameter of the bearing be correspondingly larger than the outside diameter of the worm.
When the worm is formed by rolling leading to an extension of the outside diameter compared to the original diameter of the basic material, a bigger bearing section can only be realized in a convential manner if a basic material having a diameter larger than the one of the ready-made worm is used. In the area of the worm to be rolled, the outside diameter has to be turned to the necessary size first.
The object of the invention is to provide a worm onto which at least one bearing section is formed, which allows the use of a basic material smaller in diameter than the formed bearing section but which nevertheless permits the bearing to be slipped over the ready-made worm.


SUMMARY

In order to solve this object, the invention provides a worm, especially for a worm gear of a windshield wiping system onto which at least one bearing section is formed. The worm as well as tile bearing section are formed by rolling, and the outside diameter of the bearing section exceeds the outside diameter of the worm at least slightly. While the bearing section is rolled, care must be taken that the material is pushed aside such that the outside diameter exceeds the diameter of the worm in the area of the bearing section. During the rolling process the material is known to deform from the force exerted by the rolling tool in radial direction. This means that depending on the shape of the rolling tool and its adjusting depth, radial expansion can be affected within certain limits. This invention is of particular significance, when the mentioned bearing section is situated between the worm and an even larger shaft diameter which is the case, for example, when the bearing section is situated between the worm and a commutator which is non-rotatably connected with the worm, the diameter of which commutator is normally in excess of the diameter of the bearing.
Since it is now possible to extend the diameter in the bearing area by the rolling process, it is sufficient to use a basic material of a smaller diameter so that material and cutting energy can be economized.
An improvement upon the invention resides in the fact that the worm and the bearing section are formed from a round rod of an equal original diameter in these areas. Hence the basic materials is provided with a constant outside diameter in the area of bearing section and worm. Accordingly, a larger bearing section diameter can be obtained by a more intense rolling of the material in the area of the bearing section with regard to the worm.
Furthermore, it is very advantageous that the outside diameter of at least the bearing section is ground true to size so that an also true to size inside ring of a roller bearing can be slipped over the bearing section in a known manner. In order to be able to fix said inside ring axially, when it is slipped over, a further embodiment of the invention suggests that a retaining ring, for example a snap ring, is placed at the end of the bearing section remote from the worm and is snapped into a corresponding groove.
More particularly, it is planned that the bearing section is essentially formed by two outside shoulders, the inside distance of which is defined by the width of the inside ring of the specified roller bearing.


BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 is a partial side view in partial cross-section depicting the worm and bearing.


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to the FIGURE, a worm 3

REFERENCES:
patent: 1416163 (1922-05-01), Bock
patent: 1898945 (1933-02-01), Fitzgerald
patent: 2657591 (1953-11-01), Kaelin
patent: 3362059 (1968-01-01), Di Ponio et al.
patent: 3511920 (1970-05-01), Hertfelder
patent: 3923408 (1975-12-01), Belsdorf
patent: 4589299 (1986-05-01), Kobayashi et al.
patent: 4741091 (1988-05-01), Settles
patent: 4791831 (1988-12-01), Behnke et al.
Mark's Standard Handbook for Mechanical Engineers, McGraw Hill Book Co., N.Y., 9th Edition, 1987, pp. 8-136.

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