Hydraulic oil control valve and valve timing adjustment device

A hydraulic oil control valve for a valve timing adjustment device, the valve timing adjustment device being configured to adjust valve timing of a valve and fixed to an end portion of one shaft that is a drive shaft or a driven shaft, the driven shaft being configured to selectively open and close the valve with a driving force transmitted from the drive shaft, the hydraulic oil control valve being coaxially disposed with a rotational axis of the valve timing adjustment device and configured to control a flow of a hydraulic oil supplied from a hydraulic oil supply source, the hydraulic oil control valve comprising:

• a tubular sleeve;
• and
• a tubular spool that has an end portion in contact with an actuator and that is located inward of the sleeve in a radial direction and slidably moved by the actuator in an axial direction, wherein
• the spool has an inner space serving as at least a portion of a drain passage through which the hydraulic oil discharged from a phase shifting portion of the valve timing adjustment device flows,
• the spool defines a drain inlet that guides the hydraulic oil discharged from the phase shifting portion into the drain passage, and
• at least one of the sleeve or the spool defines an opening through which the hydraulic oil in the drain passage is discharged from the hydraulic oil control valve,
• the hydraulic oil control valve further comprises
• a protrusion disposed at a position between the drain inlet and the opening, wherein
• the protrusion extends inward in the radial direction beyond the drain inlet.