Optimal design of slippers in a radial piston pump (Experiment and simulation under concentric conditions)
Mechanical components must be designed to prevent wear and seizure. In hydraulic piston pumps, abnormal friction between the piston bore and cylinder as well as bearings can cause failure or breakdown. The slipper-type bearings exhibit complex behavior, as the piston orientation is influenced by var...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
The Japan Society of Mechanical Engineers
2025-07-01
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| Series: | Mechanical Engineering Journal |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/mej/12/4/12_25-00067/_pdf/-char/en |
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| Summary: | Mechanical components must be designed to prevent wear and seizure. In hydraulic piston pumps, abnormal friction between the piston bore and cylinder as well as bearings can cause failure or breakdown. The slipper-type bearings exhibit complex behavior, as the piston orientation is influenced by various operational factors such as the rotational speed of the camshaft and supply pressure. The orientation of the piston also affects the pressure distribution on the slipper. In this study, the slipper of a radial piston pump was investigated. The behavior was examined by excluding shaft eccentricity. An experimental apparatus was developed to monitor the slipper conditions, including the slipper-shaft clearance, pocket pressure and lubricant flow rate. Experimental results confirmed that the slipper operated under fluid lubrication, as designed. Additionally, static finite element method (FEM) was used for simulation analysis under conditions that were consistent with those of the experiments. Both the experimental and simulation results revealed similar trends in the clearance. The clearance distribution indicated that the wedge film effect considerably influenced the piston orientation, during which the piston did not stand vertically but exhibited a tilted state. The robustness of the bearing was examined using FEM, which revealed that the slipper made a mechanical contact with the shaft when the piston was subjected to an external moment in a certain direction. As a countermeasure, an asymmetric configuration of piston slippers was developed, which enhanced the robustness of the bearing in a constant shaft rotational direction. |
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| ISSN: | 2187-9745 |