Oil supply apparatus

An oil supply apparatus comprising:

• an oil pump comprising:
• a pump rotor driven by an engine;
• and
• a pump housing accommodating the pump rotor,
• wherein a suction port through which oil is fed to a negative pressure region that is put into a negative pressure state by the pump rotor being rotated is formed in the pump housing, and
• a pressurized region that is put into a pressurized state by the pump rotor being rotated is divided into at least a first discharge opening and a second discharge opening, and a first discharge port and a second discharge port through which the oil is discharged from the first discharge opening and the second discharge opening, respectively, are formed in the pump housing,
• the oil supply apparatus further comprising:
• a first oil passage through which the oil from the first discharge port is supplied to at least one of a valve timing control unit that controls at least one of intake timing and exhaust timing of the engine, a piston jet from which the oil is supplied to a cylinder of the engine in such a manner that the oil is sprayed on the cylinder, and a bearing portion of a turbocharger of the engine to which the oil is supplied;
• and
• a second oil passage through which the oil from the second discharge port is supplied to a main gallery,
• wherein a bypass oil passage that brings the first oil passage and the second oil passage into communication with each other is formed, and a pressure regulating valve is provided in the bypass oil passage,
• the pressure regulating valve suppresses flow of the oil in the bypass oil passage until an oil pressure in the first oil passage reaches a first set value, and increases the flow of the oil in the bypass oil passage when the oil pressure in the first oil passage exceeds the first set value,
• after the oil pressure in the first oil passage reaches a value that is higher than the first set value, the pressure regulating valve suppresses the flow of the oil in the bypass oil passage until the oil pressure in the first oil passage reaches a second set value that is higher than the first set value, and increases the flow of the oil in the bypass oil passage when the oil pressure in the first oil passage exceeds the second set value,
• the pressure regulating valve includes a valve main body that has a through hole communicated with the bypass oil passage, and a valve body positioned in the valve main body and slidable with respect to the valve main body to change a passage cross-sectional area of the through hole,
• a first auxiliary passage and a second auxiliary passage are formed in an outer surface of the valve body, a passage cross-sectional area of the first auxiliary passage being smaller than the passage cross-sectional area of the through hole, and a passage cross-sectional area of the second auxiliary passage being smaller than the passage cross-sectional area of the through hole and larger than the passage cross-sectional area of the first auxiliary passage, and
• the valve body slides such that:
• the oil flows in the first auxiliary passage until the oil pressure in the first oil passage reaches the first set value;
• the oil flows in the first auxiliary passage and the second auxiliary passage when the oil pressure in the first oil passage exceeds the first set value and until the oil pressure in the first oil passage reaches the second set value;
• and the oil flows in the through hole when the oil pressure in the first oil passage exceeds the second set value.