| 摘要 |
An oil pump is adapted to pump oil by utilizing the variation of a cavity formed between mutually inwardly engaging gear-teeth of a drive gear and a driven gear. An oil pressure relief groove has a certain shape and is disposed at an isolated portion of the oil pump housing between an oil intake groove and an oil discharge groove. The oil pressure relief groove is in fluid communication with the oil discharge groove and relieves pressure of the oil as it is compressed between the teeth of the gears.
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