Cooling structure for a motorcycle transmission

A cooling structure for a motorcycle transmission, the transmission comprising a transmission housing, the cooling structure comprising a heat dissipation fan disposed inside the transmission housing, wherein an inner wall of the transmission housing is provided with a flow-guiding groove directly opposite to the heat dissipation fan, an air inlet communicating with the flow-guiding groove is formed in a side wall of a front end of the flow-guiding groove, a groove bottom of the flow-guiding groove is provided with an arc-shaped flow-guiding slope, a head end of the flow-guiding slope is located at the air inlet, and the flow-guiding slope is gradually inclined toward a direction close to the heat dissipation fan from the head end of the flow-guiding slope to a tail end of the flow-guiding slope, the inner wall of the transmission housing is also provided with a labyrinth partition adjacent to a rear side of the flow-guiding groove, and a lower end of the labyrinth partition is spaced from a bottom edge of the transmission housing to form an air passing opening.