Abstract: 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.

Abstract: 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.

Abstract: An actuator includes a pinion engaging a seat height adjustment mechanism. A brake drum fixed to the seat defines an outer brake race. A brake hub integrated with the pinion, rotatable in the brake drum, defines an inner brake race. Rolling brake elements between the brake races lock the brake hub to the brake drum in the absence of actuator input. A clutch drum covers the brake races, defines an outer clutch race, and includes clutch tabs to displace the rolling brake elements, unlocking the brake hub, responsive to actuator input. A driver cam rotatable within the clutch drum defines an inner clutch race. Rolling clutch elements in the clutch races transmit actuator input to the clutch drum and permit rotation of the driver cam relative to the clutch drum in the absence of actuator input. An exterior cup fixed to the brake drum defines a housing for the actuator.

Abstract: An actuator includes a pinion engaging a seat height adjustment mechanism. A brake drum fixed to the seat defines an outer brake race. A brake hub integrated with the pinion, rotatable in the brake drum, defines an inner brake race. Rolling brake elements between the brake races lock the brake hub to the brake drum in the absence of actuator input. A clutch drum covers the brake races, defines an outer clutch race, and includes clutch tabs to displace the rolling brake elements, unlocking the brake hub, responsive to actuator input. A driver cam rotatable within the clutch drum defines an inner clutch race. Rolling clutch elements in the clutch races transmit actuator input to the clutch drum and permit rotation of the driver cam relative to the clutch drum in the absence of actuator input. An exterior cup fixed to the brake drum defines a housing for the actuator.