Abstract
In order to investigate the leaking characteristics of the port plate pair in primary three-row axial piston pump/motor, the present paper deducts two equations about the leakage of oil film, analyzes the effect of such parameters as oil film thickness, sealing tape width, and central angle of waist-like slot on the leakage, and arrives at the following conclusions: for the primary three-row axial piston pump/motor, the angle of heel on cylinder increases the leakage of port plat pair, but high-pressure areas on its both sides with similar displacement weaken the effect of the scope and direction of angle of heel on the leakage and help to stabilize the port plat pair’s leakage and maintain the fluid lubrication; widening the sealing tape in a reasonable range can effectively bring down the leakage and raise the volume efficiency; in case of any change in the central angle of waist-like slot, the leakage of primary three-row axial piston pump/motor appears to be more stable than common type, which is more favorable for maintaining the fluid lubrication in the port plat pair. This study can shed some light on the structural design of the primary three-row axial piston pump/motor.
Highlights
Port plate pair is one of the three critical frictional pairs in axial piston pump/motor that makes use of dual waistlike slots to achieve flow assignment
Yan Xuewen et al [5] studied the leakage flow field along annular slot on the hydraulic plane and deducted the formula computing the slot leakage under effects of centrifugal force and differential pressure. Both of the studies examine the leakage on the basis of parallel disc models, whereas certain angle is included between the end faces of cylinder block and port plate due to the difference in the fluid oil pressure within waist-like slots on two ends of the port plate during the actual work
6 Middle row Intern alrow External row y Low pressure piston pump/motor is an important type of the new threerow axial piston pump/motor, so the leakage of its port plate pair is studied in this paper in order to provide reference for the research about the port plate pair in the axial piston pumps/motors of similar structure
Summary
Port plate pair is one of the three critical frictional pairs in axial piston pump/motor that makes use of dual waistlike slots to achieve flow assignment. Yan Xuewen et al [5] studied the leakage flow field along annular slot on the hydraulic plane and deducted the formula computing the slot leakage under effects of centrifugal force and differential pressure. Both of the studies examine the leakage on the basis of parallel disc models, whereas certain angle is included between the end faces of cylinder block and port plate due to the difference in the fluid oil pressure within waist-like slots on two ends of the port plate during the actual work.
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