Disclosed herein is a reclining device for a vehicle seat, which includes a plate holder, a sector tooth rotatably inserted into the plate holder, a pawl tooth engaged with the sector tooth, an operating cam to move the pawl tooth by rotation thereof to fix the sector tooth, a guide bush press-coupled to the operating cam and having a sealing protrusion to support a cam spring, a hollow operation shaft to rotate the operating cam, and the cam spring to restore the operating cam rotated by the operation shaft. Thus, it is possible to prevent a solution for an electrodeposition from infiltrating into the reclining device, to secure a space in which the cam spring is smoothly operated, and to contribute to a reduction in weight by use of the hollow shaft.

A second bracket of a vehicle seat reclining device includes a first pawl restriction portion and a second pawl restriction portion arranged respectively in correspondence with a first pawl and a second pawl to restrict movement of the first pawl and the second pawl in the radial direction. The second pawl restriction portion is located toward the positive direction and a radially inner side from the first pawl restriction portion. Negative direction ends of the first pawl restriction portion and the second pawl restriction portion are arranged to contact positive direction corners of the limitation portions of the first pawl and the second pawl when a rotation angle of the second bracket relative to the first bracket is a specified angle. The first pawl restriction portion allows movement of the second pawl toward the radially outer side.

A vehicle seat reclining device includes a ratchet and a guide assembled to be rotatable, a plurality of pawls that are supported by a pair of guide walls provided on the guide, mesh with the ratchet, and are arranged in the relative rotation direction and restrict relative rotation between the ratchet and the guide, and a cam that moves the pawls outward. One of the pawls is a main pawl having a rattle preventing structure. The main pawl includes a bulging portion configured to abut against the pressing portion. Each of the pawls other than the main pawl do not have a bulging portion corresponding to the bulging portion of the main pawl.

An adjustment fitting for a vehicle seat for adjusting an inclination of a backrest of the vehicle seat may have a first fitting part connectable to a seat substructure of the vehicle seat. The fitting may also have a second fitting part pivotable about an axis relative to the first fitting part and connectable to the backrest of the vehicle seat. The first fitting part and the second fitting part may be constituent parts both of a gearing unit of the adjustment fitting and of a locking unit of the adjustment fitting.

A recliner mechanism for a vehicle seat may include a guide plate, a locking plate, a pawl, an actuator hub, and a coil spring. The guide plate includes a recess and a projection. The locking plate includes a surface having teeth formed thereon. The pawl is movable in the recess between a secure position in which the pawl is engaged with the teeth of the locking plate to restrict relative rotation between the guide plate and the locking plate and a release position in which the pawl is disengaged from the teeth of the locking plate to allow relative rotation between the guide plate and the locking plate. Rotation of the actuator hub causes corresponding movement of the pawl between the secure position and the release position. The coil spring includes a first end engaging the actuator hub and a second end that hooks the projection of the guide plate.

In the present invention, a gap 73 is formed between an axial-direction outer end portion of an internal gear 30 and an attachment ring 70, and the gap 73 is filled with a lubricant 74. This configuration makes the rotation of the internal gear 30 relative to the attachment ring 70 smoother and also can reduce the generation of abnormal sound. Further, the thickness of second lock plates 60B, 60D between which and an inner surface of a guide bracket 20 rolling balls 65 are not interposed is equal to or more than the distance between the inner surface of the guide bracket 20 and outer surfaces of first lock plates 60A, 60C, between which the rolling balls 65 are interposed, and preferably substantially equal to the distance. This reduces the precession of the first lock plates 60A, 60C and makes it possible for a load input in an axial direction to be mainly received by the second lock plates 60B, 60D.

A recliner heart includes a first locking plate, a second locking plate, a hub, a pair of wedges, a first biasing member, and a second biasing member. The first locking plate includes first teeth. The second locking plate is rotatable relative to the first locking plate and includes second teeth. The first biasing member is configured to apply a first biasing force to the wedges. The second biasing member is configured to apply a second biasing force to the wedges. The hub is rotatable between a first position in which the first and second biasing forces are applied to the wedges to restrict rotation of the second locking plate relative to the first locking plate, and a second position in which the first biasing force applied to one wedge of the wedges is reduced to allow rotation of the second locking plate relative to the first locking plate.

An occupant support includes a seat bottom and a seat back coupled to the seat bottom and arranged to extend upwardly away from the seat bottom in a normal-seating configuration. The seat back is pivotable relative to the seat bottom between a plurality of positions. The seat back may be changed from an upright position to a folded-forward position.

A seat recliner for a vehicle is provided and includes: a first plate; a second plate coupled with the first plate to define an inner space; a locking gear provided in the inner space, and provided with external teeth engaged with the first plate or the second plate; a locking cam configured to move the locking gear; an input member configured such that a first end thereof passes through the first plate and is coupled with a center of a locking cam to transmit torque thereto, and a second end thereof is exposed outside the first plate; and an elastic member wound around an outer circumferential surface of the second end of the input member, and configured such that a first end thereof is stopped by the input member, and a second end is stopped by an outer side of the first plate, thereby providing a restoring force.

A vehicle seat adjuster for adjusting the inclination of a backrest with respect to the seat.