A disc recliner 18 for a seat assembly includes a fixed plate 22 secured to a seat cushion 12 and a rotatable plate 30 secured to a seat back 14. Each of the fixed and rotatable plates 22,30 has a plurality of teeth 40,48, the number of teeth not being equal. A flex spline 26 has a plurality of teeth 52, the number of teeth being equal to the number of teeth on the fixed plate 22. A wave generator 28 causes a portion of the teeth 52 on the flex spline 26 to meshingly engage with the teeth 40,48 on the fixed and rotatable plates 22,30. Rotation of the wave generator 28 causes the teeth 52 on the flex spline 26 which meshingly engage with the teeth 40,48 on the fixed and rotatable plates 22,30 to change, thereby causing the rotatable plate 30 to rotate relative to the fixed plate 22, which in turn causes the seat back 14 to pivot relative to the seat cushion 12

Provided is a continuous recliner for vehicle seats, in which an internal gear and a cover plate are fixed to each other, and the cover plate is welded to a cushion bracket. A heat transfer path is lengthened to prevent deterioration in the surface roughness of sliding friction parts, thereby reducing the operating force and operating noise of the recliner.

A drive bush configured to circumferentially rotate and drive a pair of wedge members in an eccentric space includes a cylindrical portion rotatably supported inside a boss portion of an internal tooth constituting member, a flange portion integrally formed at a first end portion in the axial direction of the cylindrical portion so as to face one side surface side of the wedge members, and a pushing portion integrally provided on the outer peripheral side of the flange portion, and configured to release a wedge effect by circumferentially pushing the wedge members. The inner surface of the cylindrical portion is integrally formed with a wall portion, and the wall portion is formed with, in the middle thereof, a female spline teeth meshing with the output shaft of a motor. The cylindrical portion, the wall portion including the female spline teeth and the flange portion have substantially the same thickness.

A drive bush configured to circumferentially rotate and drive a pair of wedge members in an eccentric space includes a cylindrical portion rotatably supported inside a boss portion of an internal tooth constituting member, a flange portion integrally formed at a first end portion in the axial direction of the cylindrical portion so as to face one side surface side of the wedge members, and a pushing portion integrally provided on the outer peripheral side of the flange portion, and configured to release a wedge effect by circumferentially pushing the wedge members. The inner surface of the cylindrical portion is integrally formed with a wall portion, and the wall portion is formed with, in the middle thereof, a female spline teeth meshing with the output shaft of a motor. The cylindrical portion, the wall portion including the female spline teeth and the flange portion have substantially the same thickness.

An electric seat and an angle adjustment device thereof are provided. The angle adjustment device includes an inner toothed plate and an outer toothed plate engaging with each other, and an eccentric cavity formed therebetween. An eccentric ring completely occupying a positive eccentric region of the eccentric cavity is provided in the eccentric cavity. The eccentric ring has a first accommodating region and a second accommodating region along a circumferential direction. The angle adjustment device further comprises a driving component for driving rotation of the eccentric ring. A damping component is provided in the first accommodating region and/or the second accommodating region, and the damping component is in a compressed state during operation of the driving component. The damping component eliminates a useless stroke in the above operation, thereby eliminating an adjustment lag experienced by a passenger during reverse adjustment of a seat and backrest.

A reduction gear may have a housing, a first gear stage and a second gear stage. The second gear stage may have an externally toothed first gear wheel and an internally toothed second gear wheel which meshes with the first gear wheel and is at least indirectly rotationally fixed to an output. The reduction gear may also have a circumferential eccentric, which is driven by the first gear stage, for driving a rolling motion from the second gear wheel to the first gear wheel. A torque support disc is guided in a linearly movable manner in a first direction along two sliding surfaces of the bearing point. A rib bears against the torque support disc and elastically pretensions the torque support disc in the direction of a further sliding surface of the bearing point. A gear motor having an electric motor may use the reduction gear.

Proposed is a seat retainer in which first outer teeth and first inner teeth or second outer teeth and second inner teeth are engaged with each other at an angle, thereby a gap between a gear plate and a first flange or between the gear plate and a second flange can be removed.

A vehicle seat, including a seat underframe and a backrest mounted pivotably with respect to the seat underframe about a backrest pivot axis, the inclination of which backrest may be adjusted in a comfort range by pivoting about the backrest pivot axis by a fitting arrangement. The fitting arrangement is provided on a first of two longitudinal backrest sides of the backrest and a locking device is provided remote from the first longitudinal backrest side, which locking device is provided to lock the backrest so as to prevent pivoting about the backrest pivot axis beyond the comfort region in the event of a crash and which is coupled to the fitting arrangement to actuate the locking device when the backrest is actuated beyond the comfort region and to release a locking provided by the locking device by actuating the fitting arrangement.

A reclining device for a vehicle seat of the kind comprising a first plate carrying an internal gear and a second plate carrying an external gear cooperating with the internal gear is provided. The reclining device includes first and second wedge elements for preventing undesired rotation of the external and internal gears relative to each other. The reclining device further includes a lock spring comprising one or more locking teeth intended to engage a ring gear which is integral with one of the first and second plates for inhibiting relative rotation of the plates, and one or more spring arms, which elastically urge the locking teeth toward the ring gear. The spring arms outwardly extend from the outer perimeter of the body of the lock spring.

A double fitting for a vehicle seat may have a first fitting part and a second fitting part that are drivingly connected to each other. The double fitting may also have adapter parts that can be connected to at least one of the fitting parts. One of the adapter parts can be connected to a structural part of the vehicle seat or to a vehicle body part, and the other adapter part is movably connected to a limited degree to the other adapter part which can be rigidly connected to the structural part or the vehicle body part. An elastic element is arranged between the adapter parts, a first fitting of the fittings is arranged axially between the adapter parts, and one of the adapter parts is arranged axially between the fitting. A vehicle seat having the double fitting is also disclosed.