A reclining apparatus includes an inner tooth member, an outer tooth member, a pair of wedges, an urging member that urges the pair of wedges, and a striker that moves the pair of wedges. Each of the pair of wedges includes a wedge body, a first end portion, a second end portion, and a protrusion. The striker includes a pair of pressing portions that presses the protrusion. Each of the pressing portions includes a pressing site having a pressing surface that presses the protrusion, and a movement restraining site that is provided on an opposite side of the pressing surface in the pressing site and restrains the wedge from moving.

A recliner heart may include a first locking plate, a second locking plate, a cam and a lubricant member. The first locking plate includes an outer diametrical surface having first teeth formed thereon. The second locking plate is rotatable relative to the first locking plate and includes an inner diametrical surface having second teeth formed thereon. Some of the second teeth are meshingly engaged with some of the first teeth. The cam is connected to the second locking plate and includes a groove formed therein. The lubricant member is disposed in the groove of the cam.

A seat reclining brake device for a vehicle includes a socket housing having an accommodating space, a locking plate inserted into accommodating space and coupled to a rotating shaft, a fixing portion formed at a position facing the locking plate and the socket housing, engaged with each other to block a relative rotation of the locking plate and socket housing or disengaged with each other, an elastic body inserted into accommodating space to apply an elastic force to locking plate in the direction in which the fixing portion is engaged, and a lever that is rotatably fastened to socket housing and includes a fixing release portion extending toward socket housing, having an inclining portion, and when the lever is rotated, moving along an inclining portion of the locking plate in the direction opposite the direction in which the elastic body applies the elastic force to disengage the fixing portion.

A reclining apparatus (51) includes: an internal gear (61) that has internal teeth (61c) which are formed on an inner peripheral surface thereof; an external gear (63) that has external teeth (63a) which have a smaller number of teeth than that of the internal teeth (61c) and are formed on an outer peripheral surface thereof; a first wedge (71) and a second wedge (73) that are provided so as to be movable along a peripheral direction in an eccentric annular space between the internal gear (61) and the external gear (63); and a striker (79) that has a pressing portion having a pair of first protrusion portions and second protrusion portions capable of pressing the first wedge (71) and the second wedge (73). The striker (79) has a plurality of the pressing portions (81, 83).

A recliner mechanism includes first, second and third locking plates and a fastener. The first locking plate has a first inner diametrical surface having first teeth formed thereon. The second locking plate has a second inner diametrical surface having second teeth formed thereon. One or both of the first and second locking plates may include an aperture extending therethrough. The third locking plate has an outer diametrical surface having third teeth formed thereon. Some of the third teeth are meshingly engaged with some of the first teeth and some of the second teeth. The fastener may extend through the aperture and is attached to one of a seatback and a seat bottom.

A reclining apparatus includes an inner tooth member, an outer tooth member, a pair of wedges, an urging member that urges the pair of wedges, and a striker that moves the pair of wedges. Each of the pair of wedges includes a wedge body, a first end portion, a second end portion, and a protrusion. The striker includes a pair of pressing portions that presses the protrusion. Each of the pressing portions includes a pressing site having a pressing surface that presses the protrusion, and a movement restraining site that is provided on an opposite side of the pressing surface in the pressing site and restrains the wedge from moving.

Disclosed is a seat recliner for a vehicle that includes: a gear plate having outer teeth around an outer surface; a cam part making the gear plate be eccentric by pressing an inner surface of the gear plate; an input part transmitting torque to the cam part; and a flange part having an inner side extending along a side of the input part and supporting the input part, an outer side having inner teeth engaged with the outer teeth of the gear plate, and a bridge connecting lower ends of the inner side and the outer side, in which the bridge extends such that a thickness gradually decreases toward the lower end of the outer side from the lower end of the inner side.

A recliner heart may include a first locking plate, a second locking plate, a cam and a lubricant member. The first locking plate includes an outer diametrical surface having first teeth formed thereon. The second locking plate is rotatable relative to the first locking plate and includes an inner diametrical surface having second teeth formed thereon. Some of the second teeth are meshingly engaged with some of the first teeth. The cam is connected to the second locking plate and includes a groove formed therein. The lubricant member is disposed in the groove of the cam.

A deceleration device for a vehicle seat comprises an external gear comprising teeth with tops projecting radially outward. A tooth of the external gear comprises a straight portion and a critical cross-section located in a dedendum flank of the tooth of the external gear. The straight portion is provided in a vicinity of the critical cross-section and a thickness of the straight portion becomes linearly larger toward a root of the tooth.

A brake device for a motor vehicle seat includes a braking section for holding a pinion shaft in a braked and locked state. The braking section includes a housing including an inner periphery including a braking surface. First and second lock plates are arranged opposite to each other with respect to the pinion shaft in the housing. The pinion shaft includes a rectangular shaft part disposed between the first and second lock plates, wherein the rectangular shaft part includes an acting surface structured to be in contact with the first lock plate. The first lock plate is pressed on the braking surface of the housing by the acting surface. The acting surface includes a crest line corresponding in position to the center of the pinion shaft, and an inclined surface that descends from the crest line toward a radially outward end of the rectangular shaft part.