To make a frame body certainly advance straight by detecting a neutral position of a steering operation means by a steering operation angle detection means and making operation amount of each of cam plate angle control members by a pair of electric working means the same in the case when a car speed detection means detects car speed.
In the case when a steering operation angle detection means detects a neutral position of a handle, it is made the same as discharge of a pair of variable flow rate control pumps PL, PR by making operation amount of each of cam plate angle control members 238L, 238R by a pair of electric working means the same. It is devised to make driving force of each of hydraulic motors ML, MR for travelling driven by each of the variable flow rate control pumps PL, PR the same. Consequently, it is possible to favourably secure a rectilinear propagating property of a frame body.
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SHIMADA TAKANOBU
FUJIKI KATSUMI
SEIREI IND