Pin roller bearing nut and screw rod pair

Abstract

The invention relates to a pin roller bearing nut and screw rod pair. The pin roller bearing nut and screw rod pair comprises a screw rod and a nut, wherein the screw rod is externally provided with an outer thread; the pin roller bearing nut and screw rod pair further comprises a pin roller; the pin roller comprises a pin roller body; a roller head part of the pin roller body is in a cone frustum structure; a roller main body of the pin roller body is in a cylindrical structure; the nut is provided with pin roller holes; the roller main body is located in the pin roller holes to form clearance fit; the roller head part is located in a tooth groove of the screw rod to form the clearance fit; the diameter of each pin roller hole is a half of a screw pitch of the screw rod and the pin roller hole is arranged spirally; at least two circles of the pin roller holes are arranged; the pin roller holes are divided into pin roller positioning holes and pin roller adjusting holes; the pin roller positioning holes and the pin roller adjusting holes are arranged on a spiral track at intervals; the centers of the pin roller positioning holes are located on the central line of the spiral track; the centers of the pin roller adjusting holes are upwards or downwards deviated for the distance of one tolerance clearance relative to the axial direction of the central line of the spiral track. The pin roller bearing nut and screw rod pair is high in positioning precision, is great in bearing load, is safe and reliable in performance, is reasonable in structure, is convenient to mount and maintain and is wide in applicable range.

Description

technical field [0001] The invention relates to a nut screw pair, in particular to a roller bearing nut screw pair, which is mainly used in machines with large bearing capacity and high positioning accuracy. Background technique [0002] In the prior art, Acme screw and ball screw are mainly used in the commonly used nut and screw pairs: In the traditional Acme screw, the outside of the screw and the inside of the nut have a thread structure that matches each other, and the screw and the nut pass through the thread structure. The surface contact between them performs sliding frictional movement, although the load it carries is large, the frictional resistance is also large, easy to wear, and the service life is short; in the ball screw, balls are arranged in the thread structure outside the screw and inside the nut, and the steel ball is connected with the screw and the nut. Nut point contact for rolling friction movement, although the friction force is reduced and the movem...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, Acme screw and ball screw are mainly used in the commonly used nut and screw pairs: In the traditional Acme screw, the outside of the screw and the inside of the nut have a thread structure that matches each other, and the screw and the nut pass through the thread structure. The surface contact between them performs sliding frictional movement, although the load it carries is large, the frictional resistance is also large, easy to wear, and the service life is short; in the ball screw, balls are arranged in the thread structure outside the screw and inside the nut, and the steel ball is connected with the screw and the nut. Nut point contact for rolling friction movement, although the friction force is reduced and the movement is flexible, but the manufacturing cost is high, the two ends cannot carry large loads, and generally cannot be self-locking

[0003] Chinese Patent No. 200680022055.6 discloses a patent titled "Roller Screw and Its Manufacturing Method". In this patent, more than two raceways are formed between the threaded shaft (ie, screw) and the nut, and the two raceways have different directions. There are multiple rollers, and there are multiple circulation members with no load return circuit, so that the ball screw can load the load in two directions of the axis of the threaded shaft; but the structure of the ball screw is complicated, the processing technology is complicated, and it is not well overcome. The defect that the nut screw pair in the prior art cannot bear large loads

[0004] Chinese Patent No. 92224740.4 discloses a patent named "Roller Screw Pair". In this patent, the nut body is provided with a radial garden hole, and a cylindrical roller is provided to pass through the radial garden hole on the nut and snap into it. The tooth socket of the screw can bear large loads, is convenient for assembly and positioning, and is equipped with needle bearings for smooth rolling; however, the arrangement of the radial holes and cylindrical rollers of the roller screw pair is not clear, and There is no solution proposed to overcome the defect of insufficient positioning accuracy of the nut and screw pairs in the prior art

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