A centralizing bushing assembly includes a bushing housing having axial ends and an opening extending therethrough along an axial axis. The opening can have a pocket extending outwardly from the axial axis within the bushing housing and have internal shoulders axially facing each other. A bushing ring can be positioned within the pocket of the bushing housing between the internal shoulders. The bushing ring can have a split for allowing collapsing of the bushing ring radially inward and have an inner diameter for slidably engaging an axially movable shaft extending through the bushing housing along the axial axis and also have an outer shoulder. A resilient biasing member can be positioned against the outer shoulder of the bushing ring for radially biasing the inner diameter of the bushing ring radially inwardly in a centralizing manner about the axial axis for engaging and centralizing the shaft slidably positioned therethrough.

The present invention provides a linear actuator including the gap compensating unit with the joints and the elastic units to provide the elasticity thereby compensating the offset during the linear motion and maintaining the stability and linearity.

An electric linear actuator has a housing, an electric motor, a speed reduction mechanism and a ball screw mechanism. The ball screw mechanism has a nut and screw shaft. A blind bore is formed on the housing. The blind bore contains an end of the screw shaft. An anti-rotation mechanism for the screw shaft has a sleeve and guide pin. The sleeve is press-formed from steel sheet and fit into the blind bore of the housing. The guide pin is mounted on the end of the screw shaft, via a through aperture formed in the screw shaft. The guide pin axially movably engages the sleeve.

A bearing for a ball screw drive may include a ball nut that is rotatable about a longitudinal axis and intended to receive a threaded spindle concentrically. The ball nut may be arranged in an inner ring and at least partially in an intermediate ring and an outer ring of the bearing. A belt pulley may be connected to the intermediate ring for rotation therewith, wherein an outer circumferential surface of the inner ring may be convex in some regions and an inner circumferential surface of the intermediate ring may be concave in some regions. The ball nut may be arranged in the bearing so as to be tiltable with respect to the belt pulley. The inner ring may be connected to the ball nut for rotation therewith and may be immovable in an axial direction. The intermediate ring may be connected via spring elements to the inner ring for rotation therewith.

A vehicular seat slide device, includes: a first rail fixed to one of a vehicular floor and a seat; a second rail fixed to the other one of the floor and the seat, and linked to be movable relative to the first rail; a screw rod supported by the second rail to be rotatable around an axial line which extends in a moving direction; a metal case fixed to the first rail, and through which the screw rod is inserted; a resin nut housed in the metal case in a state of being unmovable in the moving direction with respect to the metal case, and screwed to the screw rod; and a metal nut housed in the metal case in a state of not being in contact with the resin nut in the moving direction, and screwed to the screw rod.

Telescopic drive assembly comprising a rotatable threaded drive member, an outer tube assembly arranged axially moveable relative to the drive member but non-rotational relative to a frame and comprising a nut portion in threaded engagement with the drive member, a transmitter tube with an outer thread, and a drive tube in threaded engagement with the transmitter tube outer thread. The outer tube assembly comprises a tube guide member coupled to the nut portion via an Oldham coupling.

A bearing for a ball screw drive may include a ball nut that is rotatable about a longitudinal axis and intended to receive a threaded spindle concentrically. The ball nut may be arranged in an inner ring and at least partially in an intermediate ring and an outer ring of the bearing. A belt pulley may be connected to the intermediate ring for rotation therewith, wherein an outer circumferential surface of the inner ring may be convex in some regions and an inner circumferential surface of the intermediate ring may be concave in some regions. The ball nut may be arranged in the bearing so as to be tiltable with respect to the belt pulley. The inner ring may be connected to the ball nut for rotation therewith and may be immovable in an axial direction. The intermediate ring may be connected via spring elements to the inner ring for rotation therewith.

A linear movement system may comprise a base having two parallel rails, a table comprising two rail bearings configured to move in one dimension relative to the table and along the rails, and two force stabilization components secured to the table and configured to exert and aggregate rotational force on the table relative to the base. The force stabilization components may each comprise a fixed block secured to the table and a free-moving block in contact with the fixed block through a spring configured to push the fixed block and the free-moving block apart so that the free-moving block is in contact with one of the rails and pushes the rail away from the table location at which the fixed block is secured. This system may provide an aggregate rotational force that is stronger than other rotational forces resulting from mechanical imperfections in the system, thereby guaranteeing that the rotational force is always in the same direction.

A screw and nut linear drive assembly includes a housing, a screw within the housing, an electric motor for rotating the screw, a nut which is driven, when the screw is rotated, to move linearly in a longitudinal direction coinciding with the screw axis, and an axial force transfer arrangement to transfer force from the nut to a push rod to be connected to a member to be actuated by the assembly. The transfer arrangement includes a sequential arrangement of a first and a second axial force transferring component in force transmitting contact that are configured such that first contact points between the first and second axial force transferring components define a first axis (in a plane perpendicular to the longitudinal direction, about which the second axial force transferring component is capable of tilting with respect to the first axial force transferring component to reduce torque transfer to the nut).

A ball screw drive, in particular for an actuator of a hydraulic brake system, includes two spindle drive elements, namely a threaded spindle and a spindle nut which can be rotated relative to the threaded spindle. One of the spindle drive elements is provided as a rotatable drive element, and the second spindle drive element is provided as an output element which can be moved in a secured manner against rotation. The ball screw drive additionally includes a damping element that is configured as an annular element concentric relative to a central axis of the threaded spindle. The annular element is rigidly connected to one of the two spindle drive elements, and can be simultaneously rotated and moved relative to the other spindle drive element in a play-free manner.