The working principle of the planetary roller screw is: the matching motor drives the screw to rotate, and through the meshing rollers, the rotational motion of the motor is converted into the linear reciprocating motion of the nut. The planetary roller screw combines spiral motion and planetary motion, which is very suitable for comprehensive Situations with higher performance requirements.
The planetary roller screw is shown in the figure. Its main components are:
Screw, its thread profile is a right triangle (threads with 3 heads and above)
Nut, its internal thread profile is the same as that of the screw.
Roller, single-start thread, the end of each roller has a cylindrical pivot and a gear pivot installed in the round hole of the baffle to ensure that the rollers are evenly distributed in the radial direction. The gear teeth mesh with the internal ring gear, allowing the roller to run smoothly forward.
Retaining ring, locking the baffle.
Flat key is used to connect the driven objects. It has a simple structure, is easy to disassemble and assemble, and has good hedging properties. It is suitable for high speed, variable load and impact situations.
Reverse planetary roller screw, also known as reverse roller screw and reverse planetary roller screw, refers to a linear transmission device in which the roller arrangement or movement direction is opposite to that of a conventional planetary roller screw.
The reverse planetary roller screw has a small size and a large load. With a frameless motor, it can be used for humanoid robot arms, legs, hip joints, etc.
Standard planetary roller screws have the advantages of high speed, strong load-bearing capacity, and high precision. The effective stroke can reach more than one meter, making them very suitable for extremely heavy load environments.
Humanoid robot for the screw new release point. Trapezoidal screw and ball screw in the field of mechanical machine tools has been mature application, planetary roller screw is currently only in the aviation and other high-end applications. Tesla humanoid machine 14 linear key will use 8-10 roller screw.
Post time: Dec-06-2024
