Effects of Micropit Depths on Tribology Performance of Textured Port Plate Pair

Haishun Deng,Chuanli Wang,Shiju He,Feiyu Mao

doi:10.1155/2018/9501708

Abstract

In order to improve the friction and wear performance of textured port plate pair, effects of the micropit depth on the tribology performance is studied in the paper. The relation between the micropit depth and the port plate pair’s oil loading carrying capacity is analyzed in theory; with the friction coefficient, the wear volume and the surface roughness as the evaluation criteria, effects of the micropits’ depth on the tribology performance are investigated. The conclusions are shown as follows: oil loading capacity would come to its peak when the oil film thickness is equal to the micropit depth; the optimal micropit depth is unrelated to the area ratios and micropits’ diameters. With the same parameters, the effects of antifriction is optimal when the micropits’ depth is 10 μm, while antiwear and surface integrity are optimal when 15 μm. When the micropits’ depth is 5 μm, the antiwear, surface roughness, and antifriction are worse compared with those of the untextured port plate pair.

Highlights

The highpressure areaLoading carrying capacity should be studied by the numerical computation, which can be referred to in the related literature [18, 19]
Because the textured friction pairs can produce the additional oil film loading carrying capacity and texturing the port plate in the low pressure area would improve the mechanical property and the tribology performance, as is shown in Figure 1, the textured port plate pair discussed in this paper mainly refers to that in low pressure area. e structural sizes of the port plate are shown as follows: the inside belt’s radii r1 and r2 of the port plate are 17 mm and 19 mm, respectively, and the outside belt’s radii r3 and r4 of the port plate are 23 mm and 27.5 mm, respectively
It can be concluded that when the oil film thickness is equal to the micropit depth, the textured port plate pair has the maximum loading carrying capacity; when the oil film thickness is bigger than the micropit depth, the oil film loading carrying capacity decreases with the increase in the micropit depth; and when the oil film thickness is smaller than the micropit depth, the oil film loading carrying capacity decreases with the decrease in the micropit depth

Summary

The highpressure area

Loading carrying capacity should be studied by the numerical computation, which can be referred to in the related literature [18, 19]. To put it more accurately, the wear volume of the textured port plate pair increases over 10 times when the area ratio is 15% and the micropits’ depth is 5 μm

Hydraulic cylinder

Friction coefficient