弹性变形对轴向柱塞泵滑靴副功率损失的影响

Influence of elastic deformation on power loss of axial piston pump slipper/swash plate pair

在高速重载工况下,滑靴受外力作用时会发生弹性变形,影响滑靴副的摩擦润滑性能,增加滑靴副的能量消耗,降低轴向柱塞泵的功率传递效率。为了减小滑靴副能量耗散和提高轴向柱塞泵能量调控性能,建立1种考虑滑靴弹性变形的功率损失模型。讨论柱塞腔压力、主轴转速以及结构参数等关键参数对滑靴副功率损失的影响。研究结果表明：当工作压力为21 MPa、主轴转速为1 500 r/min时,A4VTG90泵滑靴副的泄漏功率损失为1.93-2.30 W,黏性摩擦功率损失为221.8-234.2 W,主要集中在泵的排油区;滑靴副功率损失主要以黏性摩擦功率损失为主,泄漏功率损失比较小;阻尼孔长度直径比对滑靴副功率损失影响显著,选择合适的结构参数能改善滑靴的工作性能;滑靴的结构优选值范围如下：滑靴的半径比为1.2-1.6,阻尼孔的长度直径比为4-5。

In the high speed and heavy load conditions,slipper subjected to external force action will present elastic deformation,and influence the friction and lubrication performance of swash plate / slipper pair,which increases energy consumption and decreases the power transmission effect of axial piston pump. It is necessary to take account of the effect on the power loss of swash plate / slipper pair. To reduce the power loss and improve the energy regulation of axial piston pump,a new power loss model was built with the consideration of slipper elastic deformation. The effect of key parameters on the power loss of slipper / swash plate pair were discussed,such as piston chamber pressure,shaft speeds and structure parameters. The results indicate that slipper elastic deformation produces a significant effect on the power loss of swash plate / slipper pair that takes place in the discharge pressure zone of A4VTG90 pump,when the piston chamber pressure and shaft rotational speed are,respectively,set to 21 MPa and 1 500 r / min,leakage power loss is 1.93- 2. 30 W,and viscous friction power loss is 221. 8- 234. 2 W. The energy loss of slipper bearing is mainly due to the viscous friction and the leakage power loss is low. Structural parameters,such as the radius ratio of slipper and length diameter ratio of orifice,have a significant influence on the energy loss of swash plate / slipper pair. Appropriate structural parameters will improve operation characteristics. The range of optimized structural values of slipper： radius ratio of slipper is 1. 2- 1. 5,length diameter ratio of orifice is 4- 5.