Valve timing adjustment device
AssigneeDenso Corporation
InventorTetsuro Mitsutani
Life of this patent
Estimating the term…
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.
Claims15
A valve timing adjustment device configured to adjust a valve timing of a valve of an internal combustion engine, the valve timing adjustment device comprising:
- a phase converter that has a retard chamber and an advance chamber;
- a hydraulic oil supply source that is configured to supply hydraulic oil to the retard chamber and the advance chamber;
- a hydraulic oil controller that is configured to control the hydraulic oil supplied from the hydraulic oil supply source to the retard chamber and the advance chamber;
- an oil discharge portion that is configured to receive the hydraulic oil discharged from the retard chamber or the advance chamber;
- a retard supply passage that connects between the hydraulic oil supply source and the retard chamber through the hydraulic oil controller;
- an advance supply passage that connects between the hydraulic oil supply source and the advance chamber through the hydraulic oil controller;
- a drain passage that connects the retard chamber and the advance chamber to the oil discharge portion;
- a recycle passage that connects the drain passage to the retard supply passage and the advance supply passage;
- and
- a recycle check valve that enables only a flow of the hydraulic oil from the drain passage toward the retard supply passage and the advance supply passage in the recycle passage and limits a flow of the hydraulic oil from the retard supply passage and the advance supply passage toward the drain passage in the recycle passage, wherein:
- the recycle passage is connected to the drain passage at an inside of the hydraulic oil controller;
- and
- the hydraulic oil controller includes:
- a sleeve that is shaped in a tubular form and holds the recycle check valve, wherein a portion of the retard supply passage and a portion of the advance supply passage radially extend through a peripheral wall of the sleeve;
- and
- a spool that is placed in an inside of the sleeve and is configured to reciprocate relative to the sleeve and the recycle check valve in an axial direction of the spool.
Dependencies are inferred from the claim text.