The combination of claim 1 wherein said passage has a central portion and radially inwardly angled portions extending therefrom to deliver said balls from said ball path portion of one turn to the ball path portion of an adjacent turn.ģ. A crossover button in combination with a ball nut and screw assembly comprising an axially extending screw with external lands defining a helicoidal groove having adjacent turns a ball nut thereon with internal lands defining a complemental helicoidal groove with complemental turns, the helicoidal grooves of the screw and nut defining a raceway with substantially semi-circularly shaped groove surfaces in the screw and nut separated by an operating clearance between the nut and screw lands and a train of abutting load bearing balls being received with an operating clearance within said raceway to ride on said groove surfaces, the nut having a radial bore extending through to said raceway, and the button comprising Ī) a generally Z-shaped body, having a section received within said bore, the body being provided with an axially diagonal, turn-bridging, ball crossover recirculation passage in its radially inner face which separates portions of a pair of adjacent turns into ball path portions and non-ball path portions external to said ball path portions, said passage having entrances for different turns communicating with said ball path portions ī) said body having a pair of oppositely helically extending, integrated, normally non-load bearing legs projecting laterally in a direction away from said passage entrances adjacent opposite ends of said passage, said legs curving away from said body inwardly toward said screw in conformance with said screw groove when said body section is in place in said bore, said legs being of substantially elliptical cross-section with a major axis in the radial direction and being of a dimension to be received in and substantially fill, except for a surrounding clearance, the combined volume of said adjacent non-ball path portions of both the nut and screw helicoidal grooves in which they are received to function to confront substantially the entire groove surfaces over a substantial portion of the extent of said legs to transmit load and prevent free-wheeling in the event of ball train failure the clearance around the legs being slightly greater than the clearance around said balls.Ģ.
INTERNAL BALL RECIRCULATING MECHANISM FOR RECIRCULATING BALL SCREW AND NUT ASSEMBLYġ. Manufacture of ball nut with internal crossover path for ball recirculationīALL SCREW MECHANISM WITH IMPROVED BALL GUIDE Lead screw with balls recirculating by deflector with half-spherical supports Multiple circuit internal ball nut return assembly with radial drop-in insert for ball screw devicesĬomposite motion guiding unit and composite motion guiding apparatus incorporating same
Incorporated with the body are a pair of oppositely helically extending, integrated, normally non-load bearing legs, projecting laterally in a direction away from the passage entrances adjacent opposite ends of the passage in generally parallel lateral planes, which are received in the adjacent non-ball path portions of both the complemental nut and screw helicoidal grooves out of the path of the train of load bearing balls to function to prevent free-wheeling in the event of ball train failure. The passage has entrances for different turns communicating with the ball path portions. The body has an axially diagonal, raceway turn bridging, ball crossover recirculation passage in its radially inner face which separates portions of a pair of adjacent raceway turns into ball path portions and non-ball path portions external to the ball path portions. A crossover button, in combination with a ball nut and screw assembly, has a generally Z-shaped body with a section received within a radial bore in the nut.
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