Motor having worm gear mechanism

Details Motor having worm gear mechanism Motor having worm gear mechanism

2000-03-28

2001-05-08

Mullins, Burton (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S078000, C192S044000, C192S045000, C464S169000

Reexamination Certificate

active

06229233

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Application Hei 11-125679 filed on May 6, 1999, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electric motor having a worm mechanism, which is used in a power drive system such as a vehicle power window system.
2. Description of the Related Art
A motor used in a power window system has a speed reduction worm mechanism. The worm mechanism has a worm shaft which is coaxially linked to the armature shaft of the motor. When the motor rotates, the rotation speed of the motor is transmitted to the worm shaft and reduced by the worm mechanism. Thus, torque is increased and transmitted to a window regulator to open or close a window.
In the above stated motor, axial movement of the armature shaft and the worm shaft is not effectively restricted, resulting in vibration of the shafts.
SUMMARY OF THE INVENTION
A main object of the invention is to provide an improved motor having a worm gear mechanism which can prevent the above problem.
According to a main feature of the invention, a motor is comprised of a motor section, a clutch, and an output section. The motor section includes an armature having an armature shaft, and the output section includes a worm mechanism having a worm shaft disposed coaxially with the armature shaft, and a spring for biasing the worm shaft to separate from the armature shaft. The clutch is disposed between the armature shaft and the worm shaft and includes a stationary housing, a rotatable driving member and a rotatable driven member in engagement with each other, and rollers disposed between the driven member and the housing. The drive member controls location of the rollers to restrict the driven member when the driven member rotates the drive member and to free the driven member when the drive member rotates the driven member. The spring can urge rollers in the axial direction, and no additional biasing means is necessary.
Since the motor section and the output section are connected by the clutch, they can be manufactured separately.
According to another feature of the invention, a motor comprising includes a motor housing having a plurality of permanent magnets, an armature having an armature shaft disposed in the motor housing, a worm mechanism having a worm shaft disposed coaxially with the armature shaft, and a one way clutch disposed between the armature shaft and the warm shaft. The clutch includes teeth members in engagement with each other, a plurality of rollers for controlling the teeth members, and a spring for not only holding the rollers but also urging the warm shaft to separate from the armature shaft.
The armature shaft can be also urged by permanent magnets to separate from the worm shaft. As a result, there is no interference between the armature shaft and the worm shaft, so that vibration can be eliminated.


REFERENCES:
patent: 3301081 (1967-01-01), Kern
patent: 4652781 (1987-03-01), Alexandru et al.
patent: 5819583 (1998-10-01), Matsushima et al.
patent: 5899294 (1999-05-01), Shimizu et al.
patent: 61-56701 (1986-12-01), None

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