Abstract
RV reducers contain multi-tooth contact characteristics, with high-impact resistance and a small backlash, and are widely used in precision transmissions, such as robot joints. The main parameters affecting the transmission performance include torsional stiffness and transmission errors (TEs). However, a cycloid tooth profile modification has a significant influence on the transmission accuracy and torsional stiffness of an RV reducer. It is important to study the multi-tooth contact characteristics caused by modifying the cycloid profile. The contact force is calculated using a single contact stiffness, inevitably affecting the accuracy of the result. Thus, a new multi-tooth contact model and a TE model of an RV reducer are proposed by dividing the contact area into several differential elements. A comparison of the contact force obtained using the finite element method and the test results of an RV reducer prototype validates the proposed models. On this basis, the influence of load on the different modification methods is studied, including a TE, the mechanical performance, and the transmission efficiency. In addition, the proposed reverse profile is particularly suitable for situations with a large clearance and torque. This study provides a reliable theoretical basis for a multi-tooth contact analysis of a cycloid profile modification.
Highlights
RV reducers are planocentric reduction mechanisms used for precise transmission applications.Such mechanisms incorporate numerous cycloid-pin teeth that are engaged concurrently
A Transmission errors (TEs) is one of the most important methods used to measure the accuracy of an RV reducer, and is is one of the most important methods used to measure theangles accuracy of an RV reducer, defined as the difference between the theoretical and actual rotation of the output shaft as and the is defined as the difference between the theoretical and actual rotation angles of the output shaft as input shaft rotates at any angle
Owing to the multi-tooth contact that occurs in an RV reducer, the results calculated using a traditional with a single stiffness be inaccurate
Summary
RV reducers are planocentric reduction mechanisms used for precise transmission applications. Such mechanisms incorporate numerous cycloid-pin teeth that are engaged concurrently. RV reducers have a compact and highly rigid construction that is robust against shock-load and overloading. A minimal backlash and inertia assure a rapid acceleration and extremely accurate positioning. An RV reducer is ideally suited for precision mechanical control in industrial robots, machine tools, and assembly equipment, where precise positioning and a torsional stiffness capability are required [1]. Transmission errors (TEs) are key parameters used to represent the transmission performance of an RV reducer. The TE measurement method of a precision planetary cycloid reducer is defined in GB/T
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