Tribological study on hydrostatic slipper bearing with annular orifice damper for water hydraulic axial piston motor
Tribological study on hydrostatic slipper bearing with annular orifice damper for water hydraulic axial piston motor
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DOI：
10.1016/j.triboint.2005.10.007
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发表时间：
2006-11-01
影响因子：
6.2
通讯作者：
Li, Y. P.
中科院分区：
文献类型：
--
作者：
Nie, S. L.;Huang, G. H.;Li, Y. P.
静压滑靴轴承是水压轴向柱塞马达(WHAPM)中保持滑靴和滑板之间相互滑动的液膜，从而减少直接面对面接触的一种有效方法。提出了一种带环形孔板阻尼器的静压滑动轴承，并研究了该轴承在WHAPM中的反力。研究了气缸孔内的摩擦、活塞的动力学和活塞-滑靴组件的离心力的影响。建立了具有环形孔板阻尼器的静压滑靴轴承的特征方程，该方程反映了各种几何参数(如阻尼器长度、支承长度和活塞与气缸孔之间的间隙)的影响。从而为静压滑动轴承的设计建立了相应的准则。理论分析结果表明：(A)摩擦系数、斜盘角、惯性载荷和离心力(在高电机转速下产生)对反力有显著影响；(B)适当的斜盘角有助于消除反力的波动；(C)静压滑动轴承的承载能力对阻尼长度比对活塞支承长度更敏感；(D)较短的阻尼长度有助于提高轴承的承载能力；(E)当滑靴和斜板之间的间隙为5到20微米时，活塞和气缸孔之间的小间隙将有助于提高静压滑靴轴承对变化载荷的适应能力。在定制的试验装置上，给出不同的材料组合和设计方法，进行滑靴与斜板滑动的实验研究。实验结果表明，采用环形孔口阻尼器的静压滑动轴承，与静压夹紧比轴承相比，可以降低滑动轴承与滑板之间发生严重磨损的可能性。在水润滑系统中，CRA激光熔覆层是一种很有前途的摩擦材料，与ZrO2中心点状镁离子喷涂层和2Cr13不锈钢相比是一种很有前途的摩擦材料。带环形孔板阻尼器的静压滑靴轴承已成功地应用于华中科技大学研制的WHAPM。结果表明，研制的轴承具有良好的摩擦学性能，可推广应用于水压轴向柱塞泵的制造。(C)2005爱思唯尔有限公司。保留所有权利。
Hydrostatic slipper bearing is an effective way to maintain a fluid film between slipper pad and swash plate that slide against each other, and thereby mitigate direct surface-to-surface contact in water hydraulic axial piston motor (WHAPM). The hydrostatic slipper bearing with an annular orifice damper is proposed, and the reaction force of the bearing in WHAPM is investigated. The effects from the friction within the cylinder bore, the dynamics of the piston, and the centrifugal force of the piston-slipper assembly are examined. The characteristic equation of the hydrostatic slipper bearing with an annular orifice damper is formulated, where the effects of various geometric parameters (e.g. damping length, supporting length, and clearance between the piston and the cylinder bore) are reflected. The relevant criterion for designing the hydrostatic slipper bearing can then be established. Results of the theoretical analyses indicate that (a) the friction coefficient, the swash plate angle, and the inertia and centrifugal loads (generated under a high motor rotating speed) would have significant influences on the reaction force; (b) an appropriate swash plate angle can help eliminate the fluctuation of the reaction force; (c) the load-carrying capacity of the hydrostatic slipper bearing is more sensitive to the damping length than to the supporting length of the piston; (d) a short damping length can help enhance the load-carrying capacity; (e) a small clearance between the piston and the cylinder bore would help improve the adaptive ability to the varying load for the hydrostatic slipper bearing, when clearance between the slipper pad and the swash plate ranges from 5 to 20 mu m. Experimental studies of the slipper pads sliding against the swash plates are conducted at a custom-manufactured test apparatus, given different material combinations and design methods. The experimental results indicate that the hydrostatic slipper bearing with an annular orifice damper would decrease the possibility of the severe wear between the slipper pad and the swash plate in comparison with the hydrostatic clamping ratio bearing in the WHAPM, and the CRA laser cladding (compared to the ZrO2 center dot MgO-plasma-sprayed coating and the stainless steel 2Cr13) is a promising candidate as the tribo-material when sliding against composite materials in water lubrication system. The hydrostatic slipper bearing with an annular orifice damper has been successfully applied to a WHAPM developed at the Huazhong University Science and Technology. The result demonstrates that the developed bearing has a satisfactory tribolgical performance, and can be extended to the manufacture of water hydraulic axial piston pumps. (c) 2005 Elsevier Ltd. All rights reserved.