Balancer device and lubricating system for oil pump and balancer shaft bearing

A balancer device for an internal combustion engine comprising:

• a housing having therein an accommodation section and a bearing portion;
• a balancer shaft rotatably provided at the bearing portion;
• a communication passage provided so as to branch off from an oil supply portion that supplies oil to a sliding part of the internal combustion engine for lubrication by an oil pump, the communication passage communicating with the bearing portion;
• an oil filter;
• a bearing filter provided at in the oil supply portion, the bearing filter filtering oil that flows from the oil supply portion into the communication passage;
• and an oil-pouring portion pouring oil, which flows from the oil supply portion and is not filtered by the bearing filter, toward the sliding part of the internal combustion engine through the oil filter.

An oil pump supplying oil to a sliding part of an internal combustion engine comprising:

• an oil filter;
• a bearing filter filtering a part of discharged oil and not filtering the other discharged oil;
• a first passage supplying the oil having been filtered by the bearing filter, which is disposed in the first passage, to a bearing portion of a balancer device;
• and a second passage pouring the oil not having been filtered by the bearing filter toward the sliding part of the internal combustion engine through the oil filter.

A lubricating system for a balancer shaft bearing portion comprising:

• a balancer shaft rotatably provided at a bearing portion;
• an oil pump whose outlet portion communicates with a main oil gallery of an internal combustion engine through an oil filter;
• a bearing filter provided in a passage that extends from the outlet portion toward the main oil gallery, the bearing filter filtering a part of oil and not filtering the other oil;
• and
• a communication passage supplying the oil having been filtered by the bearing filter to the bearing portion.