A ball screw includes: a screw shaft (10) having a spiral first screw groove (11) formed in an outer peripheral surface thereof; a nut (20) disposed on the periphery of the screw shaft (10) and having a spiral second screw groove (21) formed in an inner peripheral surface thereof; a plurality of balls (30) accommodated in a rolling path (23) formed by the opposing screw grooves (11, 21); and a circulation piece (40) that forms a ball return passage (42) for circulating the plurality of balls (30) through one circuit or less of the rolling path (23). Traffic variation is made to be small by determining the maximum angle of inclination (α) of the ball return passage (42) in an expression using the lead (L), the ball diameter (Da), and the lead angle (β).

An open nut and a ball screw assembly having the open nut are provided. The ball screw assembly includes a guider, an open nut, and a ball circulating assembly. The open nut includes an axial cylinder, an open shield, and two circulators. The two circulators are respectively disposed on a first axial wall and a second axial wall of the axial cylinder with an axial opening. Each of the circulators includes an inner member and an outer member. The inner member and the outer member are assembled to each other and are respectively in communication with an inner ball race between the guider and the open nut and an outer ball race of the open nut. Therefore, the inner ball race, ball races of the two circulators, and the outer ball race form a ball circulating race, and the ball circulating assembly rolls in the ball circulating race.

A ball screw includes: a screw shaft (10) having a spiral first screw groove (11) formed in an outer peripheral surface thereof; a nut (20) disposed on the periphery of the screw shaft (10) and having a spiral second screw groove (21) formed in an inner peripheral surface thereof; a plurality of balls (30) accommodated in a rolling path (23) formed by the opposing screw grooves (11, 21); and a circulation piece (40) that forms a ball return passage (42) for circulating the plurality of balls (30) through one circuit or less of the rolling path (23). Traffic variation is made to be small by determining the maximum angle of inclination (α) of the ball return passage (42) in an expression using the lead (L), the ball diameter (Da), and the lead angle (β).

A spindle nut (S) for a ball screw is conventionally designed as a hollow cylinder with a central-symmetrical middle longitudinal axis (Z). The spindle nut has an internal thread, which is designed as a ball groove (K) arranged on the cylinder inner surface. Pairs of load-relief bores (B) serve as substantially cylindrical channels for guiding the balls out of and into the ball channel (K) through the wall of the spindle nut. Each load-relief bore (B) is distinguished by a generatrix (L), which has an intersection point (C) with the thread base line of the ball channel (K) and constitutes the geometric continuation of the traveling path of a ball from the ball channel (K) into the load-relief bore (B). A tangent (T) to the cylinder surface (G) runs in a parallel manner at a spacing a >0 to the generatrix (L), both T and L being perpendicular to a common normal (R) to the middle longitudinal axis (Z).

A ball screw assembly includes a guider, an open nut, open shields, a first circulator, a second circulator, and ball circulating assemblies. The open nut is slidably fitted over the guider and includes an axial cylinder having an axial opening. Inner spiral channels of the axial cylinder and spiral channels of the guider form inner ball races. The open shields are coaxially fitted over the axial cylinder. An inner peripheral wall of each of the open shields and an outer annular wall of the axial cylinder form an outer ball race. The first circulator and the second circulator are disposed on the axial cylinder corresponding to the open shields. The inner ball races, first curves of the first circulator, the outer ball races, and second curves of the second circulator form ball circulating races, and the ball circulating assemblies roll in the ball circulating races.

A method for producing a spindle nut (10) for a ball screw (12) is provided, having the following steps: providing a substantially cylindrical workpiece (50) with first and second end faces (46, 44) and a lateral surface (14), shaping the workpiece (50) by pressing in an axially symmetrical central opening (16) and by simultaneously pressing in at least one first (18) and one second (20) channel which are arranged axially in parallel in the lateral surface (14) of the workpiece (50), the central opening (16) and the channels (18, 20) being open toward the first end face (46), introducing an internal thread (34) into the central opening (16), and introducing at least two radially running through-openings (22, 24) at least into the first channel in the form of a transfer channel for receiving diverting inserts (26, 28). A spindle nut (10) produced by the method and to a ball screw (12) having such a spindle nut (10) are also provided.

A diverter for a ball return of a ball screw configured for lifting in and lifting out balls from a ball channel between the spindle nut and the threaded spindle. The diverter is configured in one piece and has 3 functional units, specifically a positioning element, a deflection element having a spade-like lifting-out region and a diverting surface for balls out of or into the ball channel. All surfaces of the diverter that are provided for guidance of balls are configured as circumferentially open grooves (not closed in the manner of a tunnel). A method for assembling such a ball return includes providing two single-piece, structurally identical diverters; providing a pre-assembled module with a spindle nut and a threaded spindle, the spindle nut having two inwardly fitted apertures; inserting the diverters into the apertures; introducing balls; and securing the ball return by attaching a covering sleeve to the spindle nut.

A multiliner for a ball nut, a ball nut and a ball screw assembly are provided. Methods of forming the multiliner are also provided. The multiliner includes return channels that are configured to prevent bearing balls from falling out of a retaining region in a radial direction. This allows bearing balls to travel past intermediate grooves formed in a cooperating threaded ball screw shaft.

A ball screw drive comprising a leadscrew that has at least one outer ball groove and comprising a threaded nut that has at least one inner ball groove, which ball grooves together to form a ball channel in which balls, via which the leadscrew is guided relative to the threaded nut, are accommodated, wherein in the ball groove of the threaded nut is provided at least one radially closed pocket in which a deflection element for deflecting the balls moving in the ball groove is accommodated, wherein the threaded nut has an outer deflection device, which outer deflection device is axially in front of the deflection element in the form of an individual deflection element, is situated on the outer side of the threaded nut and engages in two radial openings in the threaded nut, and by means of which outer deflection device the balls are axially offset.

A ball screw assembly includes a guider, an open nut, an open shield, a first circulator, a second circulator, and a ball circulating assembly. The open nut is slidably fitted over the guider and includes an axial cylinder having an axial opening. An inner spiral channel of the axial cylinder and a spiral channel of the guider form an inner ball race. The open shield is coaxially fitted over the axial cylinder. An inner peripheral wall of the open shield and an outer annular wall of the axial cylinder form an outer ball race. The first circulator and the second circulator are disposed on the axial cylinder. The inner ball race, a first curve of the first circulator, the outer ball race, and a second curve of the second circulator form a ball circulating race, and the ball circulating assembly rolls in the ball circulating race.