Motor having worm gear mechanism

Details Motor having worm gear mechanism Motor having worm gear mechanism

2000-03-28

2001-09-11

Mullins, Burton S. (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S07500D, C192S223200

Reexamination Certificate

active

06288464

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Applications: Hei 11-199048, filed on Jul. 13, 1999, and Hei 11-199049, filed on Jul. 13, 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 one-way clutch and a worm gear 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.
If a window is forced to open from outside while the motor is not operated, an outside torque is applied to rotate the motor via the window regulator. If the motor is rotated by the outside torque, the window can be opened. As a result a door can be opened without a key.
It has been proposed that a one-way clutch is inserted between the worm shaft and the armature shaft. Such a one-way clutch allows the motor to rotate the worm gear mechanism and prohibits the worm gear mechanism to rotate the motor.
However, it is difficult to insert such an ordinary one-way clutch if the armature shaft and the worm shaft is out of alignment. In addition, such a one-way clutch makes the motor size larger.
SUMMARY OF THE INVENTION
A main object of the invention is to provide an improved motor having a one-way clutch which can solve the above-stated problem.
Another object of the invention is to provide a compact motor having a one-way clutch.
According to a feature of the invention, a motor includes a motor section, a worm mechanism, and a one-way clutch disposed between the motor section and the worm mechanism. The one-way clutch includes a drive member connected to a motor shaft, a driven member connected to a worm shaft, and a clutch housing which integrally includes a worm bearing. Therefore, the one-way clutch can be inserted easily, and the motor size can be made compact. In addition, the number of parts can be reduced.
According to another feature of the invention, motor includes a motor section including an armature and an armature shaft, an output section including 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 worm shaft. The clutch includes a drive member connected to the armature shaft, a driven member connected to the worm shaft, and a clutch housing which integrally includes a drive-member bearing.
The output section include a worm housing and a worm bearing to support the worm shaft coaxially with the armature shaft, and the clutch housing can be fixed to the worm bearing.
The one-way clutch can include a rotary member disposed between the driven member and the housing, and the drive member controls location of the rotary member to restrict the driven member if the driven member rotates the drive member, and to free the driven member if the drive member rotates the member. The driven member can have a plurality of control surfaces, and the rotary member is disposed between one of the plurality of control surfaces and the clutch housing. The drive member also can have a plurality of guide surfaces for controlling location of the rotary member.
According to another feature of the invention, a motor includes a motor section including an armature, a commutator, and an armature shaft, an output section including a worm mechanism having a worm shaft, a worm bearing supporting the worm shaft coaxially with the armature shaft, and a one-way clutch disposed between the armature shaft and the worm shaft. The one-way clutch includes a drive member having at least a pair of guide surfaces and connected to the armature shaft, driven member connected to the worm shaft, a stationary housing for accommodating the drive member and driven member, and a rotary member disposed between the driven member and stationary member and between the pair of guide surfaces. The motor section and the clutch has a common member fixed to both the motor section and the clutch.


REFERENCES:
patent: 3050321 (1962-08-01), Howe et al.
patent: 3476226 (1969-11-01), Massey
patent: 4227104 (1980-10-01), Hamman
patent: 4877113 (1989-10-01), Taig
patent: 5959385 (1999-09-01), Kato et al.
patent: 60-18667 (1995-06-01), None

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