| 摘要 |
A vehicle seat reclining device includes a lock mechanism. The lock mechanism includes first and second members, which are rotational relative each other, first pawls, and a cam, which moves the first pawls in the radial direction and unlocks or locks the same. The vehicle seat reclining device includes a memory ring, which integrally rotates with the first member or the second member through engagement, partial engagement, or disengagement from the first pawls, an engaging projection, which is located in an accommodating recess of the second member and protrudes radially inward, and a rotation permitting section located on the outer circumferential surface of the memory ring. When the rotation permitting section allows the engaging projection to move, relative rotation within a predetermined rotation range is permitted between the second member and the memory ring. |
| 主权项 |
1. A vehicle seat reclining device comprising a lock mechanism, wherein the lock mechanism includes:
a first member, which is fixed to one of a seat cushion component and a seat back component and has a guide groove; a second member, which is fixed to the other one of the seat cushion component and the seat back component, wherein the second member is rotationally supported by the first member and has inner teeth; a first pawl, which is guided by the guide groove of the first member to move in a radial direction and has outer teeth, which are selectively meshed with and separated from the inner teeth of the second member; a cam, which is rotationally arranged in the first member, wherein
when in a state of unlocking operation in which the cam is rotated in one direction, the cam retracts the first pawl inward in the radial direction to separate the outer teeth from the inner teeth, andwhen in a state of locking operation in which the cam is rotated in another direction, the cam presses the first pawl outward in the radial direction to mesh the outer teeth with the inner teeth; and an urging member, which urges the cam in a direction in which the locking operation is performed, the vehicle seat reclining device comprises: a manipulating member, which rotates the cam in a direction in which the unlocking operation is performed against the urging force of the urging member when in a state of unlocking manipulation; a memory ring, which is rotationally arranged in an accommodating recess located in the second member to be coaxial with the inner teeth in an elastically contracted state, wherein
the memory ring has a first unlocking engaging surface located on an inner circumferential surface of the memory ring and a first locking engaging surface located on the inner circumferential surface to be adjacent to the first unlocking engaging surface in a circumferential direction,the first pawl has a first pawl engaging projection,the first unlocking engaging surface becomes engaged with the first pawl engaging projection to prohibit the outer teeth of the first pawl from being meshed with the inner teeth,the first locking engaging surface releases the first pawl engaging projection to allow the outer teeth of the first pawl to be meshed with the inner teeth,at a boundary position between the first unlocking engaging surface and the first locking engaging surface, the memory ring becomes partially engaged in a radial direction with the first pawl engaging projection of the first pawl, which is retracted radially inward when in a state of a first unlocking manipulation as the unlocking manipulation, thereby restricting the first pawl engaging projection from moving onto the first unlocking engaging surface from the first locking engaging surface,the memory ring rotates integrally with the first member and relative to the second member,the memory ring becomes disengaged in the radial direction from the first pawl engaging projection when in a state of a second unlocking manipulation as the unlocking manipulation, thereby permitting the first pawl engaging projection to move onto the first unlocking engaging surface from the first locking engaging surface, andthe memory ring rotates integrally with the second member with the first member and the second member maintained in a relative rotation state corresponding to a forward inclination of a seat back; an engaging projection, which is located in the accommodating recess of the second member to project inward in a radial direction; and a rotation permitting portion, which is located on an outer circumferential surface of the memory ring, and when the rotation permitting portion permits movement of the engaging projection, relative rotation of the second member and the memory ring is permitted in a predetermined rotation range. |
