Patent ID: 8047938

Claim:
A transmission device of a walking type self-traveling lawn mower, for branching a rotating power from an output shaft vertically projected from a prime mover mounted on a vehicle body and transmitting the rotating power to drive wheels, comprising a chain drive mechanism and a rotating direction changing mechanism; wherein the chain drive mechanism is constituted by accommodating a drive sprocket fitted to the output shaft and rotating horizontally, a driven sprocket connected to the rotating direction changing mechanism and rotating horizontally, a transmission chain wound around said drive sprocket and said driven sprocket, a chain tensioner pressing a circling path of the transmission chain from an inner side to prevent loosening of the transmission chain, in a flat attachment case fixed to the vehicle body or the prime mover; and the rotating direction changing mechanism is constituted by a drive bevel gear coaxial with the driven sprocket rotating horizontally, a driven bevel gear meshed with the drive bevel gear rotating vertically, and an auxiliary output shaft coaxial with the driven bevel gear and rotating vertically.