Relief valve device

A relieve valve device, comprising:

• a housing including a valve chamber, an orifice, and a relief discharge port;
• a valve body that opens and closes the relief discharge port while moving inside the valve chamber of the housing;
• a relief valve including an elastic member that elastically biases the valve body in a direction in which the valve body closes the relief discharge port;
• and
• an oil control valve that controls a supply of oil into the valve chamber, wherein an inlet port for the oil supplied from the oil control valve and the orifice are configured such that the oil can always circulate in the valve chamber,
• wherein the valve chamber includes a first valve passage portion including the orifice, and a second valve passage portion,
• wherein the valve body includes a first valve portion, a second valve portion, and a third valve portion arranged in an axial direction,
• wherein the oil control valve supplies the oil to the first valve passage portion,
• wherein the first valve portion is disposed in the first valve passage portion,
• wherein the second valve portion is disposed in the second valve passage portion,
• wherein the third valve portion is disposed in the valve chamber,
• wherein the oil is supplied to the first valve passage portion through the oil control valve while an amount of the oil is increased and decreased steplessly, and the supplied oil is discharged from the orifice,
• wherein a diameter of the first valve portion is smaller than a diameter of the second valve portion, and the second valve portion and the third valve portion are connected in a state of being separated by a connecting shaft portion with a predetermined interval interposed therebetween,
• wherein, in a state in which the second valve portion has reached a front tend portion of the second valve passage portion, the first valve portion does not make contact with a front end portion of the first valve passage portion, and
• wherein an inlet hole and an outlet hole of a main passage are formed in an inner circumferential wall of the valve chamber, the relief discharge port is disposed at a position on an opposite side of the first valve passage portion and the second valve passage portion about the main passage, and the third valve portion of the valve body is configured for opening and closing the relief discharge port.