Valve timing adjustment device
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United States of America Patent
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-
Dec 8, 2020
Grant Date -
Oct 24, 2019
app pub date -
Jul 3, 2019
filing date -
Jan 19, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A retard supply passage connects between a hydraulic oil supply source and a retard chamber through a hydraulic oil controller. An advance supply passage connects between the hydraulic oil supply source and an advance chamber through the hydraulic oil controller. A drain passage and a drain passage connect the retard chamber and the advance chamber to an oil discharge portion, respectively. A recycle passage connects the drain passage and the drain passage to the retard supply passage and the advance supply passage, respectively. A recycle check valve enables only a flow of hydraulic oil from the drain passages toward the retard supply passage and the advance supply passage in the recycle passage. The recycle passage is connected to the drain passages at an inside of the hydraulic oil controller.
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