Electrical generator or motor structure – Dynamoelectric – Rotary
Utility Patent
1999-06-03
2001-01-02
Mullins, Burton (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S07500D, C074S411000, C464S092000
Utility Patent
active
06169346
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Application Hei 10-154812 filed on Jun. 3, 1998, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a driving apparatus including a motor and, more particularly, a door driving apparatus having a pinch-free function.
2. Description of the Related Art
In a power window device, a window regulator converts rotation of a motor into a reciprocal motion to raise or lower a window glass pane. Such a power window device may have a pinch-relief switch that stops the rising motion of the glass pane and switches the rising motion to descending motion if motor current exceeds a predetermined value or the rising speed of the glass pane becomes less than a predetermined value. Therefore, it takes a considerable time for the glass pane to stop or descend after the pinch is detected.
Power window devices disclosed in JP-A-9-184359 and JP-A-9-235944 have a C-shaped spring between a motor and an output shaft. If the glass pane pinches some foreign particle between its edge and a portion of a window frame, the spring is deformed to limit the pinching force. The spring is also intended to relieve shocks applied to the motor when an edge of the glass pane collides against a portion of a window frame. However, if the spring constant of the spring is made as small as 20-40 N/mm to lessen the pinching force to a suitable level, it is too small to sufficiently reduce the collision shock, as compared with a suitable spring constant that is as much as 100 N/mm.
SUMMARY OF THE INVENTION
A main object of the invention is to provide an improved driving apparatus having sufficient pinch-relief function and collision shock absorbing function.
According to a main aspect of the invention, a driving apparatus includes a motor, an output shaft, and an elastic transmission mechanism disposed between the motor and the output shaft. The elastic transmission mechanism relieves shocks when rotation of the output shaft is obstructed. The elastic transmission mechanism includes two elastic members which absorb shocks different in torque from each other.
Another object of the invention is to provide a driving apparatus having a weather-resistant elastic transmission mechanism.
According to another aspect of the invention, a driving apparatus includes a motor, an output unit, a worm gear unit having a worm connected to the motor and a worm wheel having an inner periphery, an elastic transmission mechanism disposed in the inner periphery of the worm wheel. The elastic transmission mechanism includes a first elastic member connected to the worm wheel, a transmission plate connected to the first elastic member, a second elastic member engaged with the transmission plate to bend in one direction, and an output plate engaged with both the second elastic member and the transmission plate and connected to said output unit. The output plate is driven directly by the second elastic member in one direction and directly by the transmission plate in the other direction.
REFERENCES:
patent: 4708514 (1987-11-01), Walter et al.
patent: 4728832 (1988-03-01), Jatnieks et al.
patent: 4748865 (1988-06-01), Umezawa et al.
patent: 4899608 (1990-02-01), Knappe et al.
patent: 5178026 (1993-01-01), Matsumoto
patent: 5382194 (1995-01-01), Scherner et al.
patent: 5452622 (1995-09-01), Fenelon
patent: 5564981 (1996-10-01), Iwabuchi et al.
patent: 5787755 (1998-08-01), Periou et al.
patent: 9-184359 (1997-07-01), None
patent: 9-235944 (1997-09-01), None
Iida Takahiro
Nakamura Yusuke
Asmo Co. Ltd.
Fish & Richardson P.C.
Mullins Burton
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