Lubricant structure of engine

The lubricant structure of an engine, comprising:

• a power transmission chamber formed as an oil reserving portion in a crank case;
• a first oil pump for pressure-feeding oil of the oil reserving portion to a plurality of lubricant points;
• a second oil pump for returning the oil returned to a crank chamber to the power transmission chamber;
• a first oil filter connected to an intake side of the first oil pump;
• and
• a second oil filter connected to an intake side of the second oil pump, wherein
• at least two oil filter attachment ports are formed in the crank case,
• the first oil filter is inserted into the crank case from one of the oil filter attachment ports of the crank case,
• the second oil filter is inserted into the crank case from the other of the oil filter attachment ports of the crank case,
• the first oil pump and the second oil pump are attached to a common pump shaft which is substantially parallel to the crankshaft in the crankshaft direction, and
• the first and second oil filters are arranged at substantially lower positions of both the oil pumps.

A lubricant structure of an engine, comprising:

• a power transmission chamber formed as an oil reserving portion in a crank case;
• a first oil pump for pressure-feeding oil of the oil reserving portion to a plurality of lubricant points;
• a second oil pump for returning the oil returned to a crank chamber to the power transmission chamber;
• a first oil filter connected to an intake side of the first oil pump;
• and
• a second oil filter connected to an intake side of the second oil pump, wherein
• at least two oil filter attachment ports are formed in the crank case,
• the first oil filter is inserted into the crank case from one of the oil filter attachment ports of the crank case,
• the second oil filter is inserted into the crank case from the other of the oil filter attachment ports of the crank case,
• the crank chamber is partitioned by a partition wall into a crankshaft housing portion for housing the crankshaft, and an oil retrieving portion located under the crankshaft housing portion communicating with an intake portion of the second oil pump,
• a communication hole for achieving communication between the crankshaft housing portion and the oil retrieving portion so as to distribute the oil is formed in the partition wall, and
• an oil pipe for pressure-feeding the oil discharged from the first oil pump to a secondary oil filter provided in the crank case is arranged in the oil retrieving portion.

A lubricant structure of an engine, comprising:

• a power transmission chamber formed as an oil reserving portion in a crank case;
• a first oil pump for pressure-feeding oil of the oil reserving portion to a plurality of lubricant points;
• a second oil pump for returning the oil returned to a crank chamber to the power transmission chamber;
• a first oil filter connected to an intake side of the first oil pump;
• and
• a second oil filter connected to an intake side of the second oil pump, wherein
• at least two oil filter attachment ports are formed in the crank case,
• the first oil filter is inserted into the crank case from one of the oil filter attachment ports of the crank case,
• the second oil filter is inserted into the crank case from the other of the oil filter attachment ports of the crank case,
• the crank case combines front and rear cylinders arranged in a V shape,
• an oil discharge port is formed on an upper surface of a cylinder head of the rear cylinder, and
• an oil returning route ranging from the oil discharge port to the power transmission chamber without passing through an inside of the crank chamber and the second oil pump is formed in the cylinder head, the cylinder and the crank case.

A lubricant structure of an engine, comprising:

• a power transmission chamber formed as an oil reserving portion in a crank case divided in a crankshaft direction;
• a first oil pump for pressure-feeding oil of the oil reserving portion to a plurality of lubricant points;
• a second oil pump for returning the oil returned to a crank chamber to the power transmission chamber;
• a first oil filter connected to an intake side of the first oil pump;
• and
• a second oil filter connected to an intake side of the second oil pump, wherein
• oil filter attachment ports are respectively formed in crank case members forming the crank case on both sides in the crankshaft direction,
• the first oil filter is inserted into the crank case from the oil filter attachment port of one of the crank case members,
• the second oil filter is inserted into the crank case from the oil filter attachment port of the other crank case member,
• the power transmission chamber is isolated from the crank chamber by a first division wall,
• a second division wall is formed in the power transmission chamber so that a gas-liquid separation chamber is formed between the second division wall and the first division wall,
• an oil inlet communicating with a discharge portion of the second oil pump is formed in the gas-liquid separation chamber, and
• an oil discharge port for discharging the oil from the gas-liquid separation chamber to the power transmission chamber is formed at a position higher than the oil inlet in the second division wall.