To enhance the straight running characteristic of a vehicle by supplying the same quantity of oil to a left and right hydraulic motors when the vehicle is in straight run.
This control device 20 for the drive of vehicle run is composed of a left 22 and a right motor control valve 32 to perform control for supplying the hydraulic oil to the left and right hydraulic motors 23, 33 which drive a left and a right crawlers 12, 13 of the vehicle body, a communication oil passage 51 (51) to tie a right oil passage 24 (34) with a left oil passage 34 (35), a communication control valve 45 (55) to perform the opening/closing control of the communication oil passages, a running operation lever 18, and a controller 30 to perform the operational control of the motor control valves and communication control valves. The operations of the left and right motor control valves are controlled in compliance with the turning of the running operation lever so that the drive of running is conducted, and the communication oil passages are opened by the communication control valves when the operation is made for straight run, while the communication oil passages are shut by the communication control valves when the operation is made for cornering.
OBA TAKAAKI
KOBAYASHI FUTOSHI
NAKAMORI YOSHIMASA
YAGISAWA YUICHI
