| 摘要 |
PROBLEM TO BE SOLVED: To reduce a weight while enlarging the diameter of a spheroidal spline by forming a device composing of a cylindrical body in which a spheroidal spline is formed on an outer peripheral part and a spline fitted to an impeller driving shaft is formed on an inner circumferential part, and a housing in which a crank shaft is connected to one end part and a spheroidal spline of the cylindrical body is fitted to the other end part. SOLUTION: A shaft coupling consists of a cylindrical body 19 which is spline-fitted to an impeller driving shaft 11, and a housing 20 for housing the cylindrical body 19. The cylindrical body 19 is provided with a spline 19a which is spline-fitted to a driving shaft 11 on an inner circumferential part, and a spheroidal spline 19b on an outer peripheral part. The housing 20 is provided with a female screw 20a screwed into a male screw 8a formed on the tip end part of the crank shaft 8 on an end part, and a spline 20b fitted to the spheroidal spline 19b on the other end part. Since the driving shaft 11 is detachabled from the cylindrical body 19, there is not the necessity for inserting the spheroidal spline 19b on a part on which the driving shaft 11 of a maintenance time propulsion device water duct is penetrated, a small sized material can be used in a seal member, and a weight can be reduced. |
