| 摘要 |
<p>According to the present invention, a front visibility is improved, entry into a cab or exit therefrom of an operator is facilitated, fine operability by a travel pedal is improved, and fatigue at feet is decreased. To achieve this, when the neutral position N of a palm rest (56) is to be detected, forward or rearward speed signals of respective traveling hydraulic motors in response to detection signals of control input detectors (19a, 20a) of right and left travelling knobs (19, 20) are outputted to respective control valves from a controller (15). When the neutral position N of the palm rest is not to be detected, a larger one of detection signals issued from these control input detectors (19a, 20a) is converted into the forward or rearward speed signals of the right and left traveling hydraulic motors (9, 10) in response to a detection signal of the control input detector (21a) of the traveling pedal (21) and a smaller detection signal issued from one of these control input detectors (19a, 20a) causes the controller (15) to output the forward or rearward speed signals of the right and left traveling hydraulic motors (9, 10) in accordance with a product of a ratio of the smaller detection signal to the larger detection signal and the detection signal issued from the control input detector (21a) of the traveling pedal (21), to the respective control valves.</p> |
