Planetary roller screw industry chain consists of upstream raw materials and components supply, midstream planetary roller screw manufacturing, downstream multi-application fields. In the upstream link, the materials selected for planetary roller screws are mostly alloy structural steel, and the materials selected for nuts and rollers are high-carbon chrome bearing steel; the parts include screws, nuts and other key components. The downstream application scenarios cover a wide range of industries, from automotive, oil and gas, medical equipment to optical instruments, engineering machinery, robotics, automation and machine tool equipment.
Planetary roller screws are usually used as the actuating parts of motor actuators, which are widely used in various industries, especially in aviation and aerospace in recent years, which requires higher requirements for motor actuators such as weight and lubrication, etc. Therefore, it is crucial to design planetary roller screws to match with motor actuator systems, and must take into account the requirements of the industry applications while guaranteeing the mechanical properties.
Design should be considered at the same time as the thread and tooth processing, screw diameter is small, the number of teeth of the roller teeth modulus are small. Design to consider the root cut dislocation and ensure that the centre line of the screw and gear centre line coincidence and other issues. What kind of gear tooth processing method is crucial, the general use of gear insertion method, but this will damage to part of the load-bearing section of the thread, reduce the system load capacity.
Planetary roller screws are more difficult to assemble, the difficulty is to ensure that the roller threads are aligned with the gear teeth while allowing multiple rollers to be installed sequentially. Two methods of solving the phase matching problem: increasing the thread clearance at the expense of load carrying capacity and transmission efficiency; adjusting the axial mounting position, which is suitable for small pitches but may cause the roller teeth to disengage from the internal gear ring in the case of large pitches.
When processing planetary roller screws, because it relies on rolling friction to transmit power, it is necessary to pay attention to friction and wear. Proper lubrication, accurate machining, and a clean environment are essential to improving the reliability and life of the screw.
In order to meet the planetary roller screw drive performance and accuracy requirements, in order to obtain the longest working life and the highest load carrying capacity, the threaded raceway must have a certain hardness, generally HRC58~62, the roller structure is small in size, and the threaded teeth of the main load bearing, its hardness is generally HRC62~64.
For high temperature working environment or stainless steel materials processed by the PRSPRS, the threaded raceway For high temperature working environment or PRS processed with stainless steel material, the surface hardness of threaded raceway HRC<58 is suitable.
Post time: Apr-16-2024
