Transmission device, especially a reversing gear for boats

Transmission device, especially a reversing gear for a marine engine, comprising a first shaft with a first gear non-rotatably fixed to said shaft, a second shaft mounted perpendicular to the first shaft with two second gears freely rotatably mounted on said second shaft, said second gears engaging the first gear and each having an individual interior conical frictional surface, and, between said second gears, a clutch sleeve axially displaceably mounted on the second shaft and having two exterior conical frictional surfaces which face away from each other and which each cooperate with an individual one of said interior frictional surfaces to alternately lock the second gears to the second shaft, characterized in that the clutch sleeve (11) has exterior conical frictional surfaces (12,13) of aluminum, which are oxidized and impregnated with a fluoroplastic and are heat-treated.