Eccentric toothed gear

Details Eccentric toothed gear Eccentric toothed gear

1999-12-06

2001-08-28

Wright, Dirk (Department: 3681)

Planetary gear transmission systems or components

Electric or magnetic drive or control

C475S162000

Reexamination Certificate

active

06280359

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
An eccentric gear drive according the invention serves to change the speed of the rotary motion of adjusting motors.
2. Prior Art
To reduce the rpm of adjusting motors with an armature rpm of approximately 7000 rpm, worm gears are used.
The worm gears used have the advantage of having self-locking from the power take-off side. The motors used have two carbon brushes and one commutator. Because of the high transmission ratio required to achieve sufficient torque, for instance for driving a window raiser in a motor vehicle, the external dimensions of an adjusting motor made up of a motor and a transmission located beside it are considerable.
SUMMARY OF THE INVENTION
An eccentric gear drive according to the invention has the advantage that it has very compact dimensions, is self-locking and is simple in design.
Compared with the known worm gears, the eccentric gear drive is comparatively insensitive to tolerances, since all the rotating parts are supported on a shaft. In a further refinement, a single guide element is provided, which by means of the guidance in the fixed housing part prevents the complete rotation of the eccentric wheel. Only a cyclical motion of the eccentric wheel about the center position occurs.
To make the motion of the eccentric wheel, and in particular the torque, uniform, the guide element is disposed, at a radial spacing from the center axis that extends past the eccentric wheel, on a bearing arm joined to the eccentric wheel; the radial spacing should be selected to be as great as possible. The power takeoff is already made uniform by this lengthening of the lever arm.
An at least theoretically completely uniform power takeoff is attained in that the housing part has one guide element in a direction perpendicular to the center axis, and that the eccentric wheel has two guide elements, which are guided in a direction perpendicular to the center axis and perpendicular to the direction of motion of the guide element. Because of the decoupled guidance of the eccentric wheel in the two guide directions perpendicular to the pivot axis, any rotary motion whatever of the eccentric wheel is averted. As a result, a completely uniform power takeoff is achieved. Since the guide mechanism completely (by self-locking) absorbs all the torques that act from outside on the power takeoff, the gear can be used for control processes in which the set portion is maintained even when force is being exerted. One example of this is its use for electric window raisers.
In an advantageous refinement, the drive mechanism of the eccentric gear drive is formed by an armature of an electric motor. Because the motor is integrated directly with the gear, the total installation space required is reduced still further. In a refinement, a complete unit, comprising the eccentric gear drive and the motor, is created.


REFERENCES:
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patent: 4231551 (1980-11-01), Ikeda
patent: 9116261.0U (1992-11-01), None
patent: 4127051A (1993-02-01), None
patent: 19729620A (1998-01-01), None
patent: 0840037A2 (1998-05-01), None
patent: 428920 (1938-06-01), None

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