Planetary roller screw mechanism, automobile hydraulic separation system and automobile

Abstract

The invention discloses a planetary roller screw mechanism, an automobile hydraulic separation system and an automobile. The planetary roller screw mechanism comprises a lead screw (1), rollers (2) and a nut (3). The rollers (2) are ring tooth rollers, and comprise large diameter sections (21) and small diameter sections. The large diameter sections mesh with the lead screw (1), and the small diameter sections mesh with the nut (3). The tooth pitch of the large diameter sections (21) of the rollers (2) is consistent with the screw pitch of the lead screw (1), and the distance A between the tooth portions of the same number of ring and the end portion reference surface of the large diameter sections (21) of the rollers (2) is sequentially increased in the order of the circumferential direction and the difference is equal. The planetary roller screw mechanism can significantly reduce the machining difficulty and manufacturing cost, has higher bearing capacity and rigidity and longer service life, and can further reduce the transmission ratio of the planetary roller screw, thereby reducing the torque and power requirements on a motor matched with the lead screw and reducing the size of the motor.

Description

technical field [0001] The invention relates to the technical field of a planetary roller screw, in particular to a planetary roller screw applied to an automobile hydraulic separation system. The invention also relates to a vehicle hydraulic separation system and a vehicle provided with the planetary roller screw. Background technique [0002] The ball screw pair is a screw transmission pair with steel balls (balls) as the rolling body between the screw and the nut, which can change the rotary motion into linear motion, or vice versa. [0003] The structure of the planetary roller screw is similar to that of the ball screw, the difference is that the load transmission element of the planetary roller screw is a threaded roller instead of a ball, and its advantage is that there are many threads to support the load. The rollers in the planetary roller screw design are non-recirculating, so the rotation speed is twice that of the ball screw. The design of the ball screw is th...

AI Technical Summary

Problems solved by technology

[0005] The planetary roller screws currently on the market, in order to ensure a small space, a large load, and to ensure a stable transmission ratio, the screw is a multi-head screw, and the roller is a helical tooth. A certain type of small-sized planetary roller screw Take the bar as an example, its nominal diameter is 8mm, the number of thread heads is 4, the lead is 1mm, and the pitch is 0.25mm. The roller can only be processed by precision grinding, which is difficult to process and expensive (a planetary roller The price of the screw is more than 10,000 yuan), and the head of the roller must be equipped with a guide gear to ensure the axial reciprocal displacement accuracy

Images