Piston and liquid-pressure rotating device including same
Number of patents in Portfolio can not be more than 2000
United States of America
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-
Jan 7, 2020
Grant Date -
May 3, 2018
app pub date -
May 2, 2016
filing date -
May 2, 2016
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A piston is cylindrical and includes: a concave spherical portion formed at one of end portions of the piston and having a partially spherical shape; a cylindrical hollow portion formed at the other end portion of the piston; and an oil passage formed between the concave spherical portion and the hollow portion, the concave spherical portion and the hollow portion communicating with each other through the oil passage. The concave spherical portion includes a concave spherical surface formed by forging and having a partially spherical shape. A convex spherical portion of a shoe is supported by the concave spherical surface so as to be slidable and rotatable. An area of contact between the concave spherical surface and a predetermined master ball corresponding to the convex spherical portion is 40% or more of an entire area of the concave spherical surface.
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