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| Pressure distribution characteristics in slipper pad bearing of axial piston pump |
| Wang Yajun |
| State Key Laboratory of Vehicle Transmission, Beijing Institute of Technology, Beijing 100081, China |
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Abstract To improve the reliability in operation of slipper pad bearing in an axial piston pump, a flow model was proposed by using concept of height with equivalent flow resistance and by fully considering the flow features in the gap of bearing based on the flow resistance principle; then the pressure distribution was calculated by means of finite volume method. Besides, effects of squeezing, operation pressure, entrainment velocity, film thickness profile etc on the pressure distribution were analyzed. It was turned out that the dynamic and static pressures are relatively independent of each other and the squeezing effect can affect the dynamic pressure remarkably; the operation pressure can influence the pressure in the central recess of bearing directly but has little effect on the dynamic pressure. The entrainment velocity can alter the pressure profile considerably; the orientation of entrainment velocity can not only influence the maximum peak dynamic pressure but also induce a quite different pressure profile in the region with a thinner thickness in oil film, even a negative pressure can be resulted at the location with the biggest sloping angle in oil film thickness profile. The dynamic pressure is very sensitive to central oil film thickness and maximum sloping; in some degree, the pressure is more sensitive to the maximum sloping angle than to the thickness.
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Received: 13 May 2013
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