VALVE PLATE, CYLINDER BLOCK, AND HYDRAULIC PUMP/MOTOR
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United States of America Patent
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Issued Date -
Sep 28, 2023
app pub date -
Sep 7, 2021
filing date -
Sep 14, 2020
priority date (Note) -
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Abstract
A valve plate of a hydraulic pump/motor, includes a high pressure-side port and a low pressure-side port, a first oil groove provided to be endless in an outer peripheral part of the high and low pressure-side ports, and a plurality of second oil grooves. Further, a plurality of pad oil grooves communicating with the first oil groove and opened toward the end face of the cylinder block is provided in an outer peripheral portion of the high pressure-side port, at least in a portion being on a downstream side of the relative rotation, in a pad region contacting the end face of the cylinder block, and the plurality of pad oil grooves is provided such that a proportion of an opening area to the end face of the cylinder block is larger on the downstream side than on an upstream side of the relative rotation.
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