A clutch unit used for a vehicle seat includes an input side clutch configured such that one member of an input side inner ring member and an input side outer ring member rotates with a rotation of an operation lever, and the other member is rotated via an input side transmission member, so that a rotation of the operation lever is transmitted to an output side clutch. A rotation suppressing member configured to apply a rotational resistance force greater than a force for the co-rotating is provided between the other member and a member that does not rotate during a return operation of the operation lever, so as to suppress co-rotation of the other member by the one member during the return operation to the neutral position.

The present disclosure relates to a stepless brake device of a vehicle seat. The coupling piece formed on the plate cover disposed on the outermost rear surface is caulked and coupled to the housing cover disposed on the outermost front side. Therefore, the components are firmly coupled, and no axial gap occurs between the components. Also, tolerance accumulation of the components does not occur, so that the tilt of the roller is reduced, and thus, collision noise of the roller during the release operation is prevented.

A brake-side clutch part includes an outer ring whose rotation is restricted and an output shaft from which rotation is output. The outer ring is provided with a slide gear that meshes with the output shaft when rotational torque is cut off and releases a meshing state with the output shaft when rotational torque is transmitted. The output shaft is provided with an inner gear that meshes with the slide gear so as to be slightly rotatable. An alignment part that aligns a phase of the inner gear with that of the slide gear when rotational torque is cut off, and a centering part that returns the inner gear to a neutral position with respect to the output shaft when rotational torque is transmitted are provided between the inner gear and the output shaft.

An adjustment assembly for a motor vehicle seat, comprising an adjustment mechanism and a flange that is part of a seat frame, the adjustment mechanism comprising: a housing, itself comprising a bottom and a cover, an output member having a base, an end opposite the base, and a pinion between the base and the end, the pinion being mounted to pivot about an axis of rotation, a backplate, comprising a base plate fixed to the flange and an upper part intended to partially receive the output member, a pumping mechanism housed in the housing and configured to drive the pinion in rotation, the output member being in contact in the flange and in the upper part, the flange and the upper part allowing rotation of the output member about the axis of rotation.

To reduce a whirling movement and abnormal noise of an output gear part. An input-side shaft part 132 and an output gear part 131 which compose a rotating operation member 130 are integrally formed. Owing to this configuration, a bearing of a feed mechanism is integrated with the output gear part, leading to a reduction in a whirling movement of the output gear part due to axial misalignment. A stepped surface 131a formed on an outer periphery of the rotating operation member 130 is stacked on an outer surface 212a of a peripheral edge part of a gear-part through-hole 212 of an attachment bracket 210, and an elastic member 230 is provided between an inner surface 212b of the peripheral edge part of the gear-part through-hole 212 and a brake mechanism 120. This also reduces a whirling movement of the output gear part 131.

The present disclosure relates to the brake device of the power swivel seat that ensures to have no clearance in the rotational direction during operation of the swivel seat, resulting in improved stability of the operation, and minimized generation of operating noise. Disclosed is a brake device of a power swivel seat including: a brake ring connected to a swivel fixing part; a brake wedge connected to a swivel rotating part; a brake roller and a brake spring installed in a wedge space formed between an inner circumferential surface of the brake ring and an outer circumferential surface of the brake wedge; and an unlocking block installed to rotate the brake wedge in a direction allowing to release lock caused by the brake roller in the wedge space.

A clutch unit includes an operation lever, an operation bracket, an output shaft member, an input-side clutch, an output-side clutch, and a housing. An input-side outer ring member of the input-side clutch is a member including a bottom part and an outer ring part. A part of the outer ring part is a thick part. The thickness of the thick part in the radial direction is larger than the thickness of a non-thick part in the radial direction.

A pumping device is disclosed for a vehicle seat, including a clutch means for receiving rotational force from the outside and transferring power to a link means of a seat cushion. The clutch means includes a clutch block rotated by the rotational force transferred from the outside, a clutch drum which is provided with the clutch block in an inside space and transfers the power to the link means of the seat cushion while rotating by the rotational force transferred from the clutch block, and a plurality of fitting pieces interposed between an outer peripheral surface of the clutch block and an inner peripheral surface of the clutch drum and transferring the rotational force of the clutch block to the clutch drum. The clutch block has a protrusion portion protruding radially from the outer peripheral surface and thus stress concentration is not generated on the plurality of fitting pieces.

An adjustment device includes a housing in which a rotary element is rotatably mounted about a rotational axis, a locking device having a first locking element, connected in a rotationally fixed manner to the rotary element, and a second locking element arranged on the housing and which can be reversibly moved between a primary position in a locked situation, in which the locking elements have a form- and/or force-locking connection, and a secondary position without the connection. An adapter plate is rotates relative to the rotary element and the housing. An unlocking element cooperates with the adapter plate in an actuator region when the second locking element is transferred into the secondary position. The second locking element is shifted by an unlocking height in the unlocking region, and by a lifting height in the actuator region. The actuator region is arranged with the lifting height smaller than the unlocking height.

Realized is a vehicle seat capable of improving the rigidity of a cushion frame with respect to a load input to a seat back while suppressing an increase in weight and size of the cushion frame. In a vehicle seat including a height adjustment mechanism which is driven to adjust the height of a seat cushion and a brake mechanism which maintains the height of the seat cushion when the height adjustment mechanism is not driven, the brake mechanism is connected to a second connection portion different from a first connection portion connected to the seat back in the cushion frame, and reinforcement portions and which extend in a direction from the first connection portion toward the second connection portion are provided between the first connection portion and the second connection portion in the cushion frame.