Disclosed is a reclining device for a vehicle seat. The reclining device includes: a flange having internal teeth and a cylindrical-shaped flange protrusion; a gear plate having a through hole and external teeth to be partially engaged with the internal teeth of the flange in an eccentric state with the flange; an input device eccentrically positioned inside the through hole of the gear plate and configured of a rotating portion and a head portion; a wedge cam positioned between an the gear plate and the flange protrusion to maintain eccentricity of the gear plate; a support body supporting a load due to the eccentricity of the gear plate and transmitting a rotational force to the wedge cam; and an elastic portion positioned between the support body and the through hole to pressurize the wedge cam.

An object of the present invention is to provide a reclining apparatus in which when a pawl is in an unlocked position, orientation of the pawl is stable, and when the pawl moves to a locked position, meshing between outer teeth of the pawl and inner teeth of a first member is stable. The reclining apparatus has at least one second cam that is provided between a cam and a second pawl, and is pressed by the cam to press the second pawl. The reclining apparatus is provided with a spring or pressing the second pawl against a pawl guide protrusion.

A vehicle seat reclining apparatus includes: a protruding portion protruding toward an inner side in a radial direction so as to be abutted by another pawl in a circumferential direction when a specific pawl abuts, in the circumferential direction, against a step formed at a boundary between a first region and a second region; and a restricting portion configured to restrict a movement range of the another pawl regulated by a regulating portion to an inner side in the radial direction than a position where the another pawl and the protruding portion interfere with each other in the radial direction.

A vehicle seat and an angle adjustment device thereof. The angle adjustment device comprises an unlock cam (3), a ratchet wheel (2) provided with internal teeth, and a plurality of slide blocks (4) disposed circumferentially and provided with external teeth. The angle adjustment device further comprises a plurality of extension and retraction blocks (6) corresponding to the slide blocks (4), wherein the extension and retraction block (6) is capable of driving the slide block (4) to move outwards in a radial direction so as to engage the internal teeth with the external teeth. A second elastic member (52) is provided between two adjacent extension and retraction blocks (6), and two ends of the second elastic member (52) in a deformation direction are respectively connected to the unlock cam (3) and the extension and retraction block (6).

This seat reclining device for a vehicle is provided with a first bracket, a second bracket, a cam, and a second pole and third pole which, with rotation or displacement of the cam, move in the radial direction of the first bracket and engage with the second bracket. The second pole and the third pole have sliding grooves which extend in a direction corresponding to the radial movement. The first bracket has engaging protrusions which are slidably inserted into the sliding grooves, and, when the second bracket is engaged with the second pole and the third pole, the engaging protrusions bias in a direction intersecting the radial movement of the second pole and the third pole through contact with the inner surface of the sliding groove.

A seat recliner for a vehicle includes parts which are respectively used in opposite sides of a seat and compatible with each other. The seat recliner includes: a first flange having guide parts, guide spaces, and a first through hole; a plurality of lock gears having a guide protrusion; a lock cam having a second through hole; a control part having a third through hole and a guide slit; and a shaft penetrating through the first through hole, the second through hole, and the third through hole so that the shaft rotates with the lock cam and the control part.

An object of the present invention is to provide a reclining apparatus in which when a pawl is in an unlocked position, orientation of the pawl is stable, and when the pawl moves to a locked position, meshing between outer teeth of the pawl and inner teeth of a first member is stable. The reclining apparatus has at least one second cam that is provided between a cam and a second pawl, and is pressed by the cam to press the second pawl. The reclining apparatus is provided with a spring or pressing the second pawl against a pawl guide protrusion.

A seat recliner for a vehicle includes a step inserted in an assembly hole of a seat frame and a second flange, and a conventional sub-guide protrusion of a lock gear is removed. The second flange is provided with both a free section and a locking section using only a guide protrusion. The seat recliner includes: a first flange having a plurality of guide parts, and a guide space; a plurality of lock gears disposed in the guide spaces of the first flange; a lock cam disposed on the first flange; a control part disposed on the lock gears and the lock cam; and a second flange including a first part and the second part, and coupled to the seat frame by insertion of an outer circumferential surface of the second part into an assembly hole of the seat frame.

A recliner heart includes a housing member, a locking plate and a pawl. The housing member includes a plate surface having a first recess and a second recess. The locking plate includes a surface having teeth formed thereon. The pawl is movable in the first recess between a secure position in which the pawl is engaged with the teeth of the locking plate and a release position in which the pawl is disengaged from the teeth of the locking plate. The pawl includes a boss slidably received in the second recess. A first lateral side of the boss abuts against a sidewall of the second recess upon an impact event.

A vehicle-seat-recliner assembly may include first and second recliner hearts, a release handle, a cross-member, a handle pin, a handle-travel-limiter, and a reinforcement member. The release handle is connected with the first recliner heart and is rotatable relative to the brackets to move the first recliner heart between locked and unlocked states. The cross-member is connected to the recliner hearts and transmits torque from the release handle to the second recliner heart to move the recliner hearts between the locked and unlocked states. The handle pin engages the release handle. The handle-travel-limiter may include a flange portion and a shaft portion. The shaft portion may include an aperture configured to receive the cross-member. The flange portion extends radially outward from the shaft portion. The handle pin engages the handle-travel-limiter. The reinforcement member may be fixed to the handle-travel-limiter and the handle pin.