A seat height adjustment actuator includes a brake drum fixable to a seat and defining an outer brake race. A rotatable brake hub includes a floor with a shelf, and a wall around the floor with cam surfaces defining an inner brake race. A pinion fixed to the brake hub engages a seat adjustment mechanism through the brake drum. Rolling brake elements wedge between the inner and outer brake races to lock the brake hub at rest. A clutch drum defines an outer clutch race, and includes tabs extending between the brake races to displace the brake rollers, unlocking the brake hub, under actuator input. A centering bias element on the floor simultaneously engages the shelf and a projection of the clutch drum for centering the projection over the shelf at rest. A driver cam receives actuator input and drives rotation of the clutch drum.

A clutch unit used for a vehicle seat includes an input side clutch is configured such that one member of the input side inner ring member and the input side outer ring member rotates with a rotation of the operation lever, and the other member of the input side inner ring member and the input side outer ring member is rotated via the input side transmission member, so that the rotation of the operation lever is transmitted to the output side clutch. A rotation suppressing member configured to urge the other member in the rotation axis direction and apply a rotational resistance force greater than a force for the co-rotating is provided so as to suppress co-rotation of the other member. A pressing force transmission portion configured to transmit a force the rotation suppressing member urges in the rotation axis direction to the output side transmission member is provided.

A pumping device for a seat of a vehicle is proposed. In the pumping device, a spring providing a restoring force to a lever bracket is directly connected to a housing without a separate component, so that the manufacturing cost is reduced and a layout size is reduced in response to removal of the component supporting the spring.

Disclosed is a seat pumping device for a vehicle. The seat pumping device includes: a housing having a through hole formed therein; a clutch cam positioned on an inside of the housing and coupled such that a coupling protrusion protruding outwardly of the housing through the through hole is turnable relative to the housing; a lever bracket positioned on an outside of an upper surface of the housing so as to face the clutch cam with the housing interposed therebetween, the lever bracket being coupled to the coupling protrusion of the clutch cam to be turned integrally with the clutch cam; and a supporting portion protruding from one of the upper surface of the housing and a lower surface of the lever bracket toward a remaining one, the upper surface of the housing and the lower surface of the lever bracket facing each other, the supporting portion supporting the lever bracket and the housing so as to be spaced apart from each other at a regular interval.

A pumping device for a seat of a vehicle, in which a cam supporter supports a clutch cam to be balanced in the pumping device, thereby minimizing movement of the clutch cam due to an external force reversely input, and the cam supporter guides movements of brake rollers, thereby causing braking operation by the brake rollers to be precisely performed and improving operating performance.

An eccentricity prevention apparatus for a pumping device is configured to prevent the eccentric movement of rotating parts operating for moving a seat up and down. The eccentricity prevention apparatus includes: a clutch device provided inside a housing; and an elastic member providing an elastic restoring force to the clutch device in a direction compensating for eccentric movement of the clutch device tilted relative to a rotating axis thereof.

A clutch unit includes a lever-side clutch part to control transmission and interruption of rotational torque input through a lever operation and a brake-side clutch part to transmit the rotational torque from the lever-side clutch part to the output side and interrupt rotational torque reversely input from the output side. The brake-side clutch part includes an outer ring constrained in rotation, an output shaft to output the rotation, cylindrical rollers to control interruption of the rotational torque reversely input from the output shaft and transmission of the rotational torque input from the lever-side clutch part through engagement and disengagement between the outer ring and the output shaft, a friction ring to apply a rotational resistance to the output shaft, and a variable part to change the rotational resistance applied to the output shaft between the transmission and the interruption of the rotational torque.

A backrest recline mechanism including a first shaft attachable to a first seat assembly component and a second shaft attachable to a second seat assembly component. The first shaft has a slotted ring defining capture slots and an interior annular space. A control ring has a first end disposed in the annular space. The second shaft is engaged with a second end of the control ring. A first collar, having a plurality of release recesses, is rotatably disposed around the slotted ring. First bearings respectively retained within the capture slots are beneath the first collar. In a first rotational position of the first collar, the plurality of release recesses align with the capture slots to rotationally disengage the first and second components. In a second rotational position, the release recesses misalign with the capture slots to rotationally engage the first and second seat assembly components.

A clutch unit includes a lever-side clutch part to control transmission and interruption of rotational torque input through lever operation, and a brake-side clutch part to transmit the rotational torque from the lever-side clutch part to an output side, and interrupt rotational torque reversely input from the output side. The brake-side clutch part includes a cover constrained in rotation, an output shaft to output the rotation, an inner ring to receive the rotational torque input from the lever-side clutch part, and a cylindrical roller to control interruption of the rotational torque from the output shaft and transmission of the rotational torque from the inner ring through engagement and disengagement between an outer ring and the output shaft. The inner ring includes a slide gear which meshes with the cover during interruption of the rotational torque and is released from the meshing state during transmission of the rotational torque.

A seat height adjustment actuator includes a brake drum fixable to a seat and defining an outer brake race. A rotatable brake hub includes a floor with a shelf, and a wall around the floor with cam surfaces defining an inner brake race. A pinion fixed to the brake hub engages a seat adjustment mechanism through the brake drum. Rolling brake elements wedge between the inner and outer brake races to lock the brake hub at rest. A clutch drum defines an outer clutch race, and includes tabs extending between the brake races to displace the brake rollers, unlocking the brake hub, under actuator input. A centering bias element on the floor simultaneously engages the shelf and a projection of the clutch drum for centering the projection over the shelf at rest. A driver cam receives actuator input and drives rotation of the clutch drum.