Geometric Design and Dynamic Analysis of a Compact Cam Reducer

Abstract

In this paper, the compact reducer which can be used as a rigid drive mechanism with a high-speed reduction ratio is systematically studied for kinematics and dynamics. The speed ratio is determined by the number of cam lobes and engaged rollers. The eccentric rotating conjugate lobe cam profile is synthesized by using the rigid body transformation method. To characterize the input torque based on Newton’s second law, the transmission forces of the resisting and driven multi-roller are proportional to the arm length of each actuating roller found by its geometric vector. In consideration of machining undercutting, roller limit load, and contact stresses, favorable designs can be achieved by adjusting the cam size, turret dimension, eccentricity, and roller size. Together with experimental tests, a prototype of the lobe cam reducer is made to verify the feasibility of the proposed design procedure and to investigate its kinematic and dynamic characteristics for speed reduction ratios, torques, and transmission efficiency.

Analytical, Numerical and Experimental Analysis of a Positive Displacement Cam Mechanism—A Case Study

“…De Groote et al [46] presented a hybrid model architecture consisting of a close interconnection of neural and physics-based network layers, which can accurately simulate the system behavior and estimate the set of critical system parameters that lead to hazardous jump phenomena in cam-follower systems. Lin et al [47] considered the machine undercutting, the roller limit load, and the contact stresses within a dynamic analysis of a compact cam reducer, which can be used as a rigid drive mechanism, proposing an optimal design through adjustment of the cam size, turret dimension, eccentricity, and roller size. Flocker [48] proposed and studied a modified trapezoidal cam profile with an adjustable forward and backward acceleration, suitable for the single-dwell cam and follower applications.…”