Long nut reverse planet pin roller lead screw

Abstract

The invention discloses a long nut reverse planet pin roller lead screw. The long nut reverse planet pin roller lead screw is characterized in that a lead screw, pin rollers and a retainer are assembled to form a virtual outer thread, the virtual outer thread and a long nut form a pair of virtual threaded transmission pair, the lead screw and the long nut are provided with multi-start triangular threads, the angle between the sides is 90 DEG, gears are arranged at the two ends of the lead screw, the planet pin rollers are dentoform single-start threads with radians (the sides of the planet pin rollers are convex), cylindrical pivots and gears are arranged at the tail ends of the pin rollers, the transmission ratio of the number of the gears at the ends of the pin rollers and the number of the gears at the ends of the lead screw is the same as the ratio of the number of the starts of the threads, the pivots are mounted in the holes of the planet retainer and distributed at equal distance, axial movement and peripheral movement are guaranteed not to happen between the lead screw and the pin rollers, the planet retainer is kept floating on the lead screw, an axial locking nut is fixed with a cotter pin, and the tail end of the long nut is in threaded connection with a feedback connecting shaft. According to the invention, the long nut reverse planet pin roller lead screw is small in size, long in travelling distance and high in strength, can meet the requirements of application working conditions for great thrust and small size, and is suitable for integrated electromechanical actuators.

Description

technical field [0001] The invention relates to the technical field of mechanical transmission components, in particular to a long-nut reverse planetary roller screw that converts rotation into linear transmission. Background technique [0002] As a new type of linear transmission unit, the planetary roller screw pair is mainly composed of rollers, screw, and nuts. There are multiple points of contact between the three, and the installation and maintenance are simple. Due to its high speed, high precision, heavy load, and It is widely used in precise transmission occasions such as precision instruments, CNC machine tools, machining centers, industrial robots, injection molding machines, optoelectronic equipment, medical equipment and aerospace, and is used as a high-thrust motor It is one of the main key components of the actuator, and is widely used in aerospace vehicles such as missiles and drones. [0003] As modern aircraft require the electromechanical actuator system ...

AI Technical Summary

Problems solved by technology

However, judging from the current use at home and abroad, the roller (ball) screw is a short nut, and the output shaft and the nut are connected by a flange (see figure 1 ), increasing the weight and volume, shortening the effective stroke of the planetary roller screw, and thus limiting the application in some working conditions with high installation space requirements

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