| 摘要 |
A hydraulic pump or motor of the axial piston type having a cylinder barrel rotating against a fixed valve plate perpendicular to the shaft and free to find its own seat against the valve plate has an improved casing which restricts circulation of liquid tending to be carried around with the rotating cylinder barrel. This reduces the magnitude of the fluid pressure forces exerted on the cylinder barrel by the circulating fluid and which tend to tip the cylinder barrel away from full contact with the valve plate which consequently increases the maximum speed at which the unit can operate.
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