| 摘要 |
PURPOSE:To simplify structure of an oil pressure circuit, to reduce a cost, and to facilitate a shift by interlinking high and low switching mechanisms, respectively disposed to two hydraulic motors, and a single running speed switching tool. CONSTITUTION:Hydraulic motors M1 and M2 on both sides form a capacity variable type motor capable of producing a rotation state for two speeds of high and low speeds, and operation shafts 25 and 26 serving as a high and low switching mechanism are linked to the wash plates of the hydraulic motors M1 and M2. A piston 29a of a hydraulic cylinder 29 is linked as a running speed switching tool, having an operation part, to a pedal 30 for shift control, and the pedal 30 for shift control is energized to the low speed operation position side through the piston 29a through the force of a spring 31. The hydraulic motors M1 and M2 are both run normally in a low speed state, and when the pedal 30 for shift control is pedalled to the high speed operation side, the hydraulic motors M1 and M2 are both switched to a high speed state and run. |
