Compact planetary roller screw in circular ring friction transmission mode

Abstract

The invention relates to a compact planetary roller lead screw in a ring friction transmission mode, which comprises a lead screw, a planet carrier, rollers, a nut and a retainer ring, the rollers are uniformly distributed around the lead screw, threads in the middle are meshed with threads of the nut and are in a non-meshed state with the screw, rings at two ends of the rollers are meshed with rings at two ends of the lead screw, and the retainer ring is in a non-meshed state with the screw. Shaft heads at the two ends of the pin roller are connected with round holes evenly distributed in the planet carriers on the two sides in a matched mode, and the steel wire check ring is installed in a groove of the lead screw and used for fixing the axial positions of the planet carriers. According to the planetary roller screw, the roller is designed to be provided with the circular rings at the two ends and the threads in the middle, the screw is designed to be of the structure that the circular rings at the two ends and the threads in the middle do not participate in meshing, and the constant lead of the planetary roller screw is achieved through specific transmission ratio and thread structure parameter design.

Description

technical field [0001] The invention relates to a planetary roller screw, in particular to a planetary screw transmission mechanism which converts rotary motion into linear motion. Background technique [0002] Compared with the ball screw, the roller screw has the characteristics of stronger load capacity, faster speed, higher precision, longer life and low maintenance cost, so it has become a precision mechanical equipment such as aviation machinery, CNC machine tools, precision instruments and meters. One of the most critical basic components in the industry, and has been widely used. In addition to screw, nut and roller, planetary roller screw also includes inner ring gear, planet carrier, retaining ring and other parts. According to the relative movement form between the roller and the nut and the screw during the transmission process, the planetary roller screw can be roughly divided into three types: standard type, nut type and circulation type. Relatively stationar...

AI Technical Summary

Problems solved by technology

In the recirculating planetary roller screw, the roller is a pure ring structure, and the nut is a thread structure, which has defects such as large noise during transmission.

In other forms of planetary roller screws, the rollers have a ring structure, and the nut also has a ring structure, but in the transmission process, there is a defect that the lead is uncertain in principle.

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