Importance

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Abstract

A rotary fluid pressure device is disclosed of the type including a roller gerotor (17) having a ring member (23) and a plurality of rollers (25) serving as internal teeth. At each end of each roller (25) is a side clearance space (85) and a small amount of lubrication fluid flows from each pressurized volume chamber through the side clearance spaces (85) into an adjacent lubricant recess (81). All of the lubricant recesses (81) are in communication with the fluid-collecting groove (79) and lubrication fluid flows from the groove (79) to the motor lubrication flow path. The lubrication flow path includes flow through a rearward bearing set (35); a forward bearing set (33); a pair of fluid passages (36); the forward splines (37, 39); and the rearward splines (43, 45). The invention results in improved lubrication generally, and of the forward splines in particular. The invention also improves the load-holding capability of the motor and biases the valve drive shaft (49) to its rearward position to reduce wear of the internal spline (53) of the rotary valve member (55).

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First Claim