Title: Low-pulsation design of motion structure in cam-lobe hydraulic motor

Authors: Chao Zhang; Yiman Duan; Pengpeng Dong; Hao Tan; Xiaolong Zhang; Min Han; Zhijian Zheng; Junhui Zhang; Bing Xu

Addresses: State Key Laboratory of Fluid Power and Mechatronic Systems, Department of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China ' State Key Laboratory of Fluid Power and Mechatronic Systems, Department of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China ' Hangzhou Applied Acoustics Research Institute, Hangzhou, 310027, China ' State Key Laboratory of Fluid Power and Mechatronic Systems, Department of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China ' State Key Laboratory of Fluid Power and Mechatronic Systems, Department of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China ' State Key Laboratory of Fluid Power and Mechatronic Systems, Department of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China ' National Intelligent Manufacturing Equipment Quality Supervision and Inspection Center, Ningbo, 315800, China ' State Key Laboratory of Fluid Power and Mechatronic Systems, Department of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China ' State Key Laboratory of Fluid Power and Mechatronic Systems, Department of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China

Abstract: Cam-lobe hydraulic motors are widely used in high-end equipment due to their low speed and high output torque. The motion structure composed of piston assemblies and cam ring is the key component that converts hydraulic power into mechanical rotational speed, which directly affects the hydraulic motor rotational speed pulsation. Yet, there is little research on the low-pulsation motion structure design. For that, this study proposed the low-pulsation design approach of motion structure to achieve the hydraulic motor with good speed stability. In general, the piston assembly number and the action number design should ensure that the total angle distribution coefficient is not less than 2, but it should be greater than 3 when the asymmetric distribution coefficient is 2. Finally, several hydraulic motors are used to validate the effectiveness of the low-pulsation design. This study can provide theory guidelines for the low-pulsation motion structure design.

Keywords: hydraulic motors; low-pulsation; motion structure; cam ring curve; speed stability.

DOI: 10.1504/IJHM.2024.143189

International Journal of Hydromechatronics, 2024 Vol.7 No.4, pp.310 - 327

Received: 21 Jul 2023
Accepted: 07 Sep 2023
Published online: 06 Dec 2024 *