PURPOSE: To quickly change the rotating direction of a propeller by utilizing a contra- rotating gear device engaging with the spindle of a main engine through a bevel gear, and making an external cylindrical shaft and an internal shaft different in a rotating direction, and applying a means for connecting a dog shifter to the above shafts. ;CONSTITUTION: In an illustrated state, a dog shifter 21 is clutchedly joined with a bevel gear type dog 17, and a propeller 8 receives the rotation of an external cylindrical shaft 4 and rotates through a rotary transmission body 34, a spline 36 and a propeller shaft 9. When an operation lever 7 is operated and moved from a state A to states B, C, a shifter working point 32 moves with an operating lever support 33 as a central point, and at the same time, the dog shifter 21 also moves through a connecting lever 31 and a cylindrical shifter 29. In this case, in the state B, the torque of the external cylindrical shaft 4 and an internal shaft 5 is not transmitted to the propeller shaft 9, and when the operation lever 7 is set in the state C, the dog shifter 21 is connected with a bevel gear type dog 20 for an internal shaft to transmit the rotation of the internal shaft 5 to the propeller shaft 9 for reversedly rotating a propeller 9.;COPYRIGHT: (C)1996,JPO
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