Balancer apparatus equipped with oil pump

A balancer apparatus equipped with an oil pump, the balancer apparatus equipped with the oil pump being configured to be fixed to an internal combustion engine, the oil pump being attached to the balancer apparatus equipped with the oil pump,

• the oil pump including
• a pump housing including a pump containing chamber provided therein,
• a pump forming member contained in the pump containing chamber and configured to discharge oil introduced from an intake portion from a discharge portion to an oil passage of the internal combustion engine when a rotational force is transmitted thereto, and
• a control oil chamber provided between the pump containing chamber and the pump forming member in a radial direction with respect to a rotational axis of the pump forming member, the control oil chamber being configured to change a hydraulic pressure of the oil to be discharged from the pump forming member with the aid of the oil introduced therein after being discharged from the discharge portion, passing through an oil passage of the internal combustion engine, and being subjected to a pressure adjustment,
• the balancer apparatus equipped with the oil pump comprising:
• a balancer housing including a bearing retainer portion configured to transmit the rotational force from the internal combustion engine to the pump forming member, the bearing retainer portion supporting a balancer shaft disposed along the rotational axis of the pump forming member, the balancer housing being attached to the pump housing in a direction of the rotational axis of the pump forming member;
• and
• a plurality of oil passage opening portions formed on the balancer housing and also opened toward a main oil gallery of the internal combustion engine, the plurality of oil passage opening portions being each connected to the oil passage of the internal combustion engine, the plurality of oil passage opening portions including a discharge oil passage opening portion of a discharge oil passage connecting the discharge portion and the main oil gallery of the internal combustion engine to each other, and a return oil passage opening portion of a return oil passage connected to between the main oil gallery and at least one of the control oil chamber and the bearing portion.