Abstract:
A ball screw device has a plurality of spiral raceways. One end and the other end of each raceway is connected via a bridge. An annular flange of a ball nut has a plurality of mounting portions at equal intervals in a circumferential direction. A fixing screw is fitted to each mounting portion. The bridges arranged so as to overlap with the annular flange in position in an axial direction are arranged at positions different in the circumferential direction from positions at which the mounting portions are arranged, and are arranged at unequal intervals in the circumferential direction.
Abstract:
A linear ball screw assembly and method of construction thereof is provided. The assembly includes a screw having a helical external groove and a ball nut having a through bore configured for receipt of the screw therethrough and including a helical internal groove radially aligned with the external groove of the screw to form a helical raceway. A plurality of axial load balls are disposed in the helical raceway. The nut includes a pair of non-grooved internal cylindrical surfaces extending in axially opposite directions from the internal groove along the external groove of the screw to provide outer surfaces of a pair of radial load raceways. A plurality of radial load balls are disposed in the radial load raceways. The radial and axial load balls have different diameters and/or the internal cylindrical surfaces are provided by a pair of sleeve inserts.
Abstract:
Since it is configured that an female screw groove 2a of a nut 2 extends round an axis of the nut 2 through 360 degrees or less and a sectional shape thereof taken at right angles to the groove contains a circular arc portion 2c of 90 degrees or less and a rectilinear portion 2d which connects to the circular arc portion at a bottom of the groove and extends in parallel with the axis, after molding, a lower mold LM and an upper mold UM can simply be removed from a barrel mold BM in the axial direction, and consequently, the necessity of provision of a parting plane which passes through the thread groove 2a can be obviated, thereby making it possible to easily form the thread groove 2a which is free from a difference in level or a stepped portion.
Abstract:
An internal recirculating ball screw and nut system that is easier to manufacture and more reliant by virtue of a particular configuration of the grooves on the interior of the nut or the follower. Crossback portions of select nut grooves are arranged in a manner that allows the bearing balls to recirculate by slipping over the top of adjacent thread lands of the screw, advancing and recirculating within a single 360 degree rotation within said nut. Said recirculation is accomplished solely through the design of the path of a unitary nut, without use of any ancillary devices.
Abstract:
A linear actuator comprises a ball screw carrying an axially restrained rotatable ball nut driven by an electrically energized motor. An enclosing motor housing has front and rear walls with axially aligned openings for passing the ball screw. The motor has a radially inner hollow stator assembly and a generally concentric radially outer rotor assembly. A can member is integrated with the rotor assembly to rotate therewith and has a radial end wall connected to the nut.
Abstract:
A linear ball screw assembly and method of construction thereof is provided. The assembly includes a screw having a helical external groove and a ball nut having a through bore configured for receipt of the screw therethrough and including a helical internal groove radially aligned with the external groove of the screw to form a helical raceway. A plurality of axial load balls are disposed in the helical raceway. The nut includes a pair of non-grooved internal cylindrical surfaces extending in axially opposite directions from the internal groove along the external groove of the screw to provide outer surfaces of a pair of radial load raceways. A plurality of radial load balls are disposed in the radial load raceways. The radial and axial load balls have different diameters and/or the internal cylindrical surfaces are provided by a pair of sleeve inserts.
Abstract:
An assembly apparatus for assembling a ball screw device includes a support block, a nut arranged in a longitudinal direction, a nut reception base that arranges the nut so that its axial direction towards vertical direction of the assembly apparatus and that supports the nut so as to elevate the nut with respect to the support block, a temporary shaft inserted into an inner diameter side of the nut arranged on the nut reception base and rotatably supported by the support block, an inclined face provided at a forward end portion of the temporary shaft, for guiding balls into the nut raceway groove and a pushing mechanism that has elasticity in the radial direction of the temporary shaft and that pushes balls which are fed into the nut raceway groove by a forward end portion protruding from the outer circumferential face of the temporary shaft.
Abstract:
A lubricant supply device is to be fitted to a nut member engaging with a screw shaft through rolling members to supply lubricant to the screw shaft along with a relative rotational motion of the nut member to the screw shaft. The device comprises an application member, a lubricant storage member and a control device. The application member for applying the lubricant on the screw shaft has at least one tongue portion, which is capable of coming into contact with at least one of rolling-member running surface of the screw shaft. The number of the at least one tongue portion is identical with or larger than the number of the rolling-member running surface. The lubricant storage member supplies the lubricant to the application member. The control device controls an amount of the lubricant supplied from the lubricant storage member to the application member.
Abstract:
A ball screw device has a plurality of spiral raceways. One end and the other end of each raceway is connected via a bridge. An annular flange of a ball nut has a plurality of mounting portions at equal intervals in a circumferential direction. A fixing screw is fitted to each mounting portion. The bridges arranged so as to overlap with the annular flange in position in an axial direction are arranged at positions different in the circumferential direction from positions at which the mounting portions are arranged, and are arranged at unequal intervals in the circumferential direction.