WORKING MACHINE

摘要

There is provided a working machine which is capable of vehicle speed control through accelerator pedal operation even during execution of work under a condition where engine rotational speed is maintained constant. The working machine has the normal mode for exercising vehicle speed control by controlling engine rotational speed on the basis of the amount of depression of the accelerator pedal and by controlling the swash plate of the EST pump on the basis of the engine rotational speed, and the attachment mode for exercising vehicle speed control by controlling the swash plate of the HST pump on the basis of the amount of depression of the accelerator pedal irrespective of engine rotational speed.

主权项

1. A working machine comprising:
a HST pump constructed of a swash plate-type variable displacement pump which is driven by an engine; a HST motor making a closed-circuit connection with the HST pump via a pair of speed-change oil passages, for driving a traveling device by being driven with oil discharged from the HST pump; a control unit for controlling said engine and said HST pump; and an accelerator pedal for controlling vehicle speed, said control unit having a normal mode for exercising vehicle speed control by controlling engine rotational speed on the basis of an amount of depression of said accelerator pedal and by controlling a swash plate of the HST pump on the basis of the engine rotational speed, and an attachment mode for exercising vehicle speed control by controlling the swash plate of the HST pump on the basis of the amount of depression of said accelerator pedal irrespective of engine rotational speed.