Straight groove holder circulating type planet pin roller lead screw

Abstract

The invention relates to a straight groove holder circulating type planet pin roller lead screw. The straight groove holder circulating type planet pin roller lead screw comprises a main lead screw, aholder, pin rollers and a nut. The exterior of the main lead screw and the inner wall of the nut are both provided with threads. The pin rollers are located in a straight through groove of the holder. The holder, the nut and the main lead screw are coaxially arranged. The pin rollers are distributed in a planet circumferential array manner relative to the main lead screw. The length of the straight through groove of the holder is larger than the axial lengths of the pin rollers. The pin rollers are provided with straight groove lines. The two ends of the nut are provided with cams. The cams are connected with the inner side of the nut through stop screws, the side faces of the cams are provided with side protruding parts, the threads of the inner wall of the nut are provided with recedinggrooves, and the side protruding parts of the cams correspond to the receding grooves and end sockets of the pin rollers in position. According to the straight groove holder circulating type planet pin roller lead screw, on the premise of not carrying out relative large improvement on threads of an existing lead screw, the moving speed of the nut can be reduced, the requirement for small lead andhigh precision are met, and relatively large load can be borne.

Description

Technical field [0001] The invention relates to the field of transmission, in particular to a straight groove cage circulating planetary roller screw. Background technique [0002] Planetary roller screw is a mechanical device that converts rotary motion into linear motion. [0003] The planetary roller screw drive is unique. Around the main threaded screw, 6-12 threaded roller screws are arranged on the planet, which converts the rotation of the motor into the linear motion of the screw or nut. Planetary roller screws can withstand heavy loads for thousands of hours in extremely difficult environments, which makes planetary roller screws an ideal choice for applications requiring continuous work. [0004] However, there is no relative axial movement between the roller and nut of the existing planetary roller screw, and the threads of the screw and roller of the existing planetary roller screw are mostly multi-threaded, which leads to the existing The lead of the planetary roller s...

AI Technical Summary

Problems solved by technology

[0004] However, there is no axial relative motion between the roller and the nut of the existing planetary roller screw, and most of the threads of the screw and the roller of the existing planetary roller screw are multi-start threads, so the existing The lead of the planetary roller screw is larger, that is, the movement speed of the nut is faster, and the precision is lower at low speed movement

[0005] If the moving speed of the nut is simply reduced by changing the number of thread starts and the thread lead, under the structural limitations of the existing planetary roller screw, it is extremely difficult to process the thread that meets the requirements, and the thread is too fine to withstand larger load

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