Studies on the Intermittent Lubrication System of Axial Piston Pumps and Motors : Report 1, Theoretical Analysis

概要

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Some types of axial piston pumps and motors are equipped with an intermittent oil lubrication system for the sliding surfaces of cylinder block and distributor. Most of this system feeds pressurized oil to the outer side of the distributor intermittently and is an automatic regulating system tactfully utilizing the hydrostatic bearing in which the load capacity varies with the variation in oil film thickness and sharing the support of the load with the pressure distribution produced on the inner circumfential surface, maintains an approximate uniform oil film thickness on the sliding surface. Results of the analysis may be summarized as follows: (1) The characteristics of pumps and motors adopting the intermittent lubrication system can be grasped by considering the mean value of the equilibrium force, and the optimum oil film thickness and resistance coefficient of the throttle groove can be calculated. (2) Optimum oil film thickness varies with the size and operating condition of the pumps and motors. It is about (15-17)10^<-4>cm for a displacement equivalent to 100 cm^3/rev.
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