Patent ID: 11965438
Assignee: DENSO CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A valve timing adjustment device that adjusts a valve timing of a valve of an internal combustion engine, the valve timing adjustment device comprising:
a phase conversion unit that includes a hydraulic chamber and is capable of converting a rotational phase between a drive shaft and a driven shaft of the internal combustion engine by a hydraulic oil supplied from a hydraulic oil supply source to the hydraulic chamber, and adjusting the valve timing of the valve;
a hydraulic oil controller capable of controlling flow of the hydraulic oil supplied to the hydraulic chamber by controlling the hydraulic oil flowing through an oil supply passage connecting the hydraulic oil supply source and the hydraulic chamber; and
a check valve part disposed in the oil supply passage to allow the hydraulic oil to flow from the hydraulic oil supply source to the hydraulic chamber, and restrict the hydraulic oil from flowing from the hydraulic chamber to the hydraulic oil supply source, wherein
the check valve part has
an inflow port into which the hydraulic oil flows,
a valve seat formed around the inflow port,
an outflow port having an axis intersecting with an axis of the inflow port,
a valve body provided so as to be separated from the valve seat or in contact with the valve seat,
a spring biasing the valve body in a direction of the valve seat, and
a sleeve surrounding the spring,

the valve timing adjustment device further includes a back pressure oil passage that causes a space opposite to the valve seat with respect to the valve body to communicate with the outflow port,
the back pressure oil passage is formed to communicate the space and the outflow port with each other through outside of the sleeve of the check valve part: and
wherein a back pressure hole is formed in the sleeve and opposite to the valve body with respect to the space, the back pressure hole is configured to directly communicate the space with the back pressure oil passage.