A brake device for a motor vehicle seat is composed of a brake assembly, a tooth assembly, and a lever assembly. The brake assembly includes a housing, a pinion shaft, a braking component, and a drive wheel that are structured to be self-held in an assembled state by mechanical interaction thereamong. The tooth assembly includes a holder plate and a tooth plate that are structured to be self-held in an assembled state by mechanical interaction therebetween. The lever assembly includes an input lever, a cover, a coil spring, and a lever bracket that are structured to be self-held in an assembled state by mechanical interaction thereamong. The brake assembly, the tooth assembly, and the lever assembly are arranged and assembled together in an axial direction.

A brake device comprises a brake mechanism which comprises an output shaft having a drive gear secured thereto, a brake housing having a cylindrical braking surface therein and coaxially putting therein the output shaft, two pairs of clamp members movably and abreast installed in the brake housing in such a manner that paired two clamp members of each pair put therebetween an enlarged operation part of the output shaft and two springs that bias the two clamp member of each pair to pivot away from each other, in which each of the clamp members has an outer clamp surface that is slidably contactable with the cylindrical braking surface and includes larger and smaller clamp surface areas that are spaced from each other by a recess.

A recliner for a vehicle seat includes a first gear having a collar part at a center thereof, a second gear being internally in contact with the first gear and configured to eccentrically engage with the first gear, a socket including a first coupling portion having an outer diameter portion coupled to be in contact with an inner diameter portion of the collar part, and a second coupling portion having an inner diameter portion coupled to surround an outer diameter portion of the collar part while being in contact with the outer diameter portion of the collar part, and a pair of wedge cams disposed between the socket and the second gear and configured to restrain or release the socket and the second gear.

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.

A reclining device includes: an internal gear; an external gear; a first wedge and a second wedge; a biasing member; and a striker, which has a pressing portion capable of pressing the first wedge and the second wedge, wherein a concave portion recessed with passing though in a diameter direction is formed on the first wedge and the second wedge, wherein the pressing portion of the striker is superimposed on an upper surface of the concave portion, and wherein the pressing portion presses a pressed portion that is provided on the concave portion on at least one of the first wedge and the second wedge to move the one of the first wedge and the second wedgepressed portion in a direction in which the wedge is pulled out from or in a direction in which the wedge is pushed.

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).

Disclosed is a seat recliner for a vehicle, the seat recliner including: a flange provided with internal teeth on an inner circumferential surface thereof; a gear plate disposed in the internal teeth of the flange, provided with external teeth along an edge thereof to be engaged with the internal teeth of the flange with being eccentric with respect to the flange, and formed with a through-hole at a center thereof; a rotating cam disposed at a center of the through-hole of the gear plate; a wedge cam held between the rotating cam and an inner circumferential surface of the through-hole of the gear plate to maintain eccentricity of the rotating cam and the gear plate, and provided with a lubrication part on a contact surface with the rotating cam to preserve lubricant; and an elastic member configured to press the wedge cam.

A brake device of a recliner for a vehicle seat includes: a housing having a through-hole through which a shaft of a seat recliner passes and a key portion formed toward the inside thereof; a fixture provided in an accommodation space of the housing, through which the shaft penetrates, supported upwards by a spring, and configured to be prevented from rotating by engagement of a protrusion portion and the key portion while being supported upwards; and a release lever installed above the fixture to be coupled to the shaft and configured to preferentially rotate, when a rotational force is applied from the outside, the shaft and enable rotation of the shaft and the fixture.

Proposed herein is a reclining apparatus for a seat, which secures coupling between a cap and a gear plate through a uniform position adjustment of the cap when the cap of a recliner is assembled, secures operation performance between components, and prevents a bearing from being deformed and separated due to an external force.

Disclosed is a seat recliner for a vehicle, the seat recliner including: a flange provided with internal teeth on an inner circumferential surface thereof; a gear plate disposed in the internal teeth of the flange, provided with external teeth along an edge thereof to be engaged with the internal teeth of the flange with being eccentric with respect to the flange, and formed with a through-hole at a center thereof; a rotating cam disposed at a center of the through-hole of the gear plate; a wedge cam held between the rotating cam and an inner circumferential surface of the through-hole of the gear plate to maintain eccentricity of the rotating cam and the gear plate, and provided with a lubrication part on a contact surface with the rotating cam to preserve lubricant; and an elastic member configured to press the wedge cam.