Rotary torque transmission apparatus for four-wheel drive vehicles
A rotary torque transmission apparatus is described for a four-wheel drive vehicle comprising: a two-four wheel drive change over slider for changing the drive of the vehicle between two and four wheel drive; a reciprocable movable fork shaft including a shift fork engageable with the change over slider for moving the slider between a two wheel drive position and a four wheel drive position; and fork shaft drive means for moving the fork shaft, the fork shaft drive means including a casing, an ouput shaft rotatable supported in the casing, a motor, a worm wheel rotatable supported on the output shaft and driven by the motor, a pair of fixed plates mounted on the output shaft, a pair of rotary plates rotatable with the worm wheel and positioned axially between the fixed plates along the output shaft, and a torsion spring arranged radially outwardly of the rotary plates and including two ends each, retained between one of the rotary plates and one of the fixed plates, whereby the rotary torque of the driven worm wheel is transmitted to the output shaft by the torsion spring.
- Assignee:
- Aisin Seiki Kabushiki Kaisha, Kariya
- Patent Number(s):
- US 4805472
- OSTI ID:
- 6302260
- Country of Publication:
- United States
- Language:
- English
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