Vertical fluid power transmission and outboard engine system

An outboard engine system comprising:

• a casing;
• an engine including a crankshaft and mounted in an upper part of the casing;
• a torque converter;
• an output shaft connected to the crankshaft through the torque converter;
• and
• a propeller shaft arranged below the output shaft to be driven by the output shaft;
• the torque converter, the output shaft and the propeller shaft being disposed in the casing;
• an oil tank disposed in the casing;
• an oil pump for drawing up a stored oil in the oil tank;
• a first oil supply passage for guiding the oil discharged from the oil pump to a portion to be lubricated in the engine;
• and
• a first oil return passage for returning the oil from the portion to be lubricated to the oil tank;
• a second oil supply passage for guiding the oil discharged from the oil pump directly to a circulation circuit in the torque converter;
• and
• a second oil return passage for returning the oil from the circulation circuit to an intake side of the oil pump or to the oil tank.

An outboard engine system comprising:

• a casing;
• an engine including a crankshaft and mounted in an upper part of the casing;
• a torque converter;
• an output shaft connected to the crankshaft through the torque converter;
• and
• a propeller shaft arranged below the output shaft to be driven by the output shaft;
• the torque converter, the output shaft and the propeller shaft being disposed in the casing;
• an oil tank disposed in the casing;
• a first oil pump for drawing up a stored oil in the oil tank;
• a first oil supply passage for guiding the oil discharged from the first oil pump to a portion to be lubricated in the engine;
• and
• a first oil return passage for returning the oil from the portion to be lubricated to the oil tank;
• a second oil pump for drawing up the stored oil in the oil tank a second oil supply passage for guiding the oil discharged from the second oil pump directly to a circulation circuit in the torque converter;
• and
• a second oil return passage for returning the oil from the circulation circuit to the oil tank.