| 摘要 |
A lock mechanism for a steering ratio varying device in which a steering ratio increase and decrease shaft is controlled by a motor through a worm gear and a worm wheel. The lock mechanism includes a lock plate mounted on a shaft of the worm gear or a shaft of the motor and having a plurality of cutout portions. Each cutout portion has a corner section. A lock member is engageable with the cutout portion of the lock plate. A lock release member has an inclined surface engageable with the corner section of the cutout portion of the lock plate to push back the lock plate by an amount corresponding to a backlash of the worm gear. An electromagnetic device includes a plunger spring and a solenoid coil. The lock member and the lock release member are engaged with the cutout portion of the lock plate by a pushing force of the plunger and disengaged from the cutout portion by an attracting force of the solenoid coil. A tight meshing between the lock plate and the lock member is prevented by the lock release member.
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