The invention discloses a high-power motorboat outboard engine
flywheel. An outer circumference face, matched with an inner hole of a cylinder body, of a shaft sleeve is arranged to be in a step structure and is composed of an outer layer disc, an outer edge boss and an inner layer disc, wherein the an outer layer disc, the outer edge boss and the inner layer disc are arranged in sequence, the
diameter of the outer edge boss is larger than the
diameter of the outer layer disc and the
diameter of the inner layer disc, and a plurality of sections of
cutting string grooves are formed in the outer circumference face of the outer edge boss. When the high-power motorboat outboard engine
flywheel is assembled, the outer layer disc of the shaft sleeve is placed in a step
small hole of the cylinder body. A plurality of sections of gaps are formed on the corresponding portions of the
cutting string grooves of the outer edge boss and a large hole of the cylinder body. A die is composed of an upper die and a lower die which are arranged in a matched mode. An upper convex die is arranged on the upper die, and a lower convex die is arranged on the lower die. The shaft sleeve and the cylinder body are connected into a whole through an upper baffle block, a lower baffle block and a rotation-stopping baffle block, wherein the upper baffle block and the lower baffle block are formed on the outer edge boss. According to the connecting method, a die
stamping method is adopted, the shaft sleeve and the cylinder body are firmly connected into the whole, the size of the shaft sleeve is obviously decreased, consumed materials of the shaft sleeve are reduced, and precious resources and
machining work hours are saved.