Power unit for saddle-ride type vehicle

In a power unit for a vehicle, comprising:

• an internal combustion engine and a transmission operatively connected thereto;
• a crank shaft adapted to rotate and produce torque, said crank shaft being operatively connected to the internal combustion engine;
• an output shaft disposed in a rear portion of the power unit in a vehicle advancing direction to output the torque produced by the crank shaft to the exterior through the transmission;
• a water pump disposed below the crank shaft and adapted to be rotated with the torque transferred thereto from the crank shaft;
• an oil cooler mounted on a rear surface of the power unit in a vehicle advancing direction below the output shaft and at a position lower than the crank shaft;
• and
• a left crank case and a right crank case,
• wherein the transmission is accommodated within an internal space formed by combining the left and right crank cases which constitute the power unit,
• wherein the oil pump is disposed within at least one of the left and right crank cases;
• wherein the oil cooler is fixed to a rear surface in the vehicle advancing direction of the crank case in which the oil pump is disposed, and
• wherein a rotary shaft of the oil pump and a rotary shaft of the water pump are coaxially disposed and interlocked with each other.

A power unit for a saddle-ride vehicle, comprising:

• an internal combustion engine and a transmission supported by a saddle-ride vehicle body having a front wheel in a front portion thereof;
• a crank shaft adapted to rotate and produce torque, said crank shaft being operatively connected to the internal combustion engine;
• an output shaft disposed in a rear portion of the power unit in a vehicle advancing direction to output the torque produced by the crank shaft to the exterior through the transmission;
• a water pump disposed below the crank shaft and adapted to be rotated with the torque transferred thereto from the crank shaft;
• an oil cooler mounted on a rear surface of the power unit in the vehicle advancing direction below the output shaft and at a position lower than the crank shaft;
• and an oil filter operatively connected to a distal end of the oil cooler for filtering oil.