S113014 円すいローラねじ機構の概要とローラ支持構造 : 円すいローラねじ機構の研究([S11301]機械システムの要素技術と設計(1))

Abstract

In this paper, we first introduce the outline of the conic roller screw mechanism, a new device for converting rotary motion to linear motion, and explain on its roller supporting structure. The new mechanism achieves high durability by reducing Hertzian contact stress on rolling contact by bringing roller into line contact with screw shaft, and also maintains high mechanical efficiency by minimizing partial slip on the contact line. Each of three rollers that contact with screw shaft is supported by holder through tapered roller bearings, and they are permitted to tilt. The load center of tapered roller bearing is located to the proper position. This roller supporting structure is considered for long life of the tapered roller bearing. The method of mechanical efficiency estimation for the roller supporting structure is also explained, and results of the estimation varying coefficients of rolling friction are showed. It's confirmed that the roller supporting structure can hold good mechanical efficiency.