Abstract
Under the background of the rapid development of today’s aerospace industry, the bearing characteristics of planetary roller screw drive under high overload conditions are studied. Designing a high-load, high-performance precision planetary roller screw drive is of practical and significant. An axially spaced RV type planetary roller screw with a single nut is designed under aerospace conditions. Under the conditions of the aerospace working load and efficiency, the parameters and structures of the planetary roller screw are completed. Based on this, the bearing characteristics of the planetary roller screw are studied and the equivalent finite element model of the planetary roller screw is analyzed. Those analyses include stress and strain, elastic–plastic properties, transmission efficiency, and dynamic load capacity. The results show that the design of planetary roller screw meets the design requirements for aerospace conditions. And the results can provide a basis for the design and manufacture of planetary roller screws under high loads.
Highlights
A planetary roller screw is a mechanical transmission that converts rotational motion into linear motion or vice versa.[1]
The force bearing contact surface of the lead screw is greatly increased,[4,5,6] so that the bearing capacity and rigidity of the planetary roller screw are improved by several times compared with the ordinary ball screw.[7,8]
The basic study of the load characteristics of planetary roller screws, including the analysis of stress-strain, elastic–plastic properties, transmission efficiency, and anal subjected dynamic loads, compares the results with those required under aerospace conditions
Summary
A planetary roller screw is a mechanical transmission that converts rotational motion into linear motion or vice versa.[1]. The basic study of the load characteristics of planetary roller screws, including the analysis of stress-strain, elastic–plastic properties, transmission efficiency, and anal subjected dynamic loads, compares the results with those required under aerospace conditions It provides the basis for the design and manufacture of planetary roller screws under high loads. The maximum stress value is within the allowable stress range and meets the working load requirements It is known from the true strained LE cloud diagram of the planetary roller screw equivalent model (Figure 8). The designed planetary roller screw meets the requirements for the rated dynamic load of the transmission under aerospace conditions
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