The reason is as follows; A portion

The reason is as follows; A portion of lubricating oil for spiral oil wedge hydrodynamic bearing drains from oil return hole due to the oblique thrust of spiral oil groove, and the pressure flow resistance and shear resistance are larger, so the temperature is higher around the oil return hole; In axial direction, the temperature is lower around the oil feed hole, but the temperature is larger around the oil return hole, it is the same as above-mentioned reason. The higher temperature at high speed and around the oil return hole is easy to lead to the deformation of bush and the bad lubrication
condition, even it can lead to shaft-braking.

結果 (中文) 2:

的理由如下; 润滑油从油返回孔螺旋油楔流体动力轴承排水沟由于螺旋油槽的斜推力，压力流动阻力和剪切阻力的部分较大，所以温度是周围的油返回孔更高; 在轴向方向上，温度是周围的供油孔低，但温度是周围的油返回孔较大，它是相同的上述原因。较高的温度以高速和周围的油返回孔容易导致衬套与润滑不良的变形
条件，甚至它可以导致轴制动。

結果 (中文) 3:

究其原因如下；润滑油的螺旋油楔动压轴承水渠从回油孔，由于螺旋油槽的斜推力的一部分，和压力阻力和剪切阻力较大，因此温度的回油孔周围的高；在轴向方向上，温度是油孔周围的下，但温度是回油孔较大，这是上述原因相同。在高速度及回油孔，容易导致布什，润滑不良
条件下的变形温度较高，甚至会导致轴制动。