| 摘要 |
<p>In a travel-driving mechanism for a self-propelled working machine such as a self-propelled lawn mower travels by using power of an electric motor 30, the torque of a driving shaft 50, which is driven by the power of the electric motor 30 through a power transmission unit 40, is transmitted to travel-driving wheels 7 through two-way or bi-directional clutches 55 provided at both ends of the driving shaft 50. Power transmission units 61, 62 are provided between the bi-directional clutch 55 and the driving wheels 7. A travel control unit 70 is provided to input an instruction signal produced by the operation of a travel operation member 86, which is operated by the operator, and to control the electric motor 30. When a travel stop signal produced by the operation of the travel operation member 86 is input to the travel control unit 70, short-circuit stop (short-circuit braking) occurs while electric power is being supplied to the electric motor 30, and the driving shaft 50 connected to the electric motor 30 stops. Since the travel driving wheels 7 rotate due to inertia, the bi-directional clutches 55 are brought into disengaged state. The operator can thus easily pull and push the working machine after the travel by the driving source or after the stop thereof, by using a simple structure in which the bi-directional clutch is used for transmitting travel power.</p> |
