Abstract: A ship propulsion unit includes: an engine including a crankshaft extending in a front-rear direction of a ship; a propeller shaft; a power transmission mechanism configured to couple the crankshaft and the propeller shaft; an upper case; and a lower case accommodating the propeller shaft and connected to the upper case. The power transmission mechanism includes a drive shaft extending from the upper case toward the lower case. The upper case and the engine are fixed to a ship body. A connection portion between the upper case and the lower case is provided with a rotation mechanism configured to rotate the lower case around an axis of the drive shaft.

Abstract: An engine propelling apparatus has power generating transmitting portion provided below a power generating portion, a propelling force generating portion provided adjacent to the power transmitting portion, and height adjustment mechanisms. The power generating portion includes an engine with a crankshaft arranged horizontal and substantially parallel to the front-rear longitudinal direction of a boat. A power transmission mechanism forms a linear power transmission route extending from the vicinity of a front end of the crankshaft to the vicinity of a front end of the propelling force generating portion. The propelling force generating portion includes a propeller shaft extending rearwards from the power transmitting portion, and a propeller at a rear portion of the propeller shaft. The height adjustment mechanisms vary inclination or height of all or a part of the engine propelling apparatus with respect to the boat to thereby vary height of the propeller with respect to the boat.

Abstract: A ship propulsion unit includes: an engine including a crankshaft extending in a front-rear direction of a ship; a propeller shaft; a power transmission mechanism configured to couple the crankshaft and the propeller shaft; an upper case; and a lower case accommodating the propeller shaft and connected to the upper case. The power transmission mechanism includes a drive shaft extending from the upper case toward the lower case. The upper case and the engine are fixed to a ship body. A connection portion between the upper case and the lower case is provided with a rotation mechanism configured to rotate the lower case around an axis of the drive shaft.

Abstract: A marine engine propelling apparatus (10) is mounted to an outboard portion at a rear end of a boat. The engine propelling apparatus (10) has a power generating portion (13), a power transmitting portion (17) provided below the power generating portion (13), a propelling force generating portion (28) provided below the power transmitting portion (17), and a height adjustment mechanism (25). The power generating portion (13) includes an engine (11) equipped with a crankshaft (11C), and the crankshaft (11C) is arranged substantially parallel to a front-rear direction of the boat and is substantially horizontal. The power transmitting portion (17) has a power transmission mechanism forming a linear power transmission route (D2) extending from the vicinity of a front end of the crankshaft (11C) to the vicinity of a front end of the propelling force generating portion (28).