JPS6189064U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a side view of a wheeled upper swing vehicle, FIG. 2 is a diagram illustrating the configuration of an embodiment of the present invention, and FIG. 3 is a diagram illustrating the configuration of a conventional driving device for a wheeled upper swing vehicle. 24 is a travel motor circuit, 30 is a forward/reverse switching valve,
G is a control circuit.

Claims (1)

[Scope of utility model registration request] An upper vehicle body B is rotatably provided on a lower traveling body A equipped with a steering wheel 2 steered by a steering cylinder 5 via a turning mechanism D, and a handle 8 is provided on the upper vehicle body B.
By operating the hydraulic pressure source 6, the pressure oil discharged from the hydraulic source 6 is supplied to the steering mechanism 7 and the steering cylinder 5, and the steering cylinder 5 is switched by the steering switching valve 13 when the upper vehicle body B turns 180 degrees. The steering switching mechanism F, the relay X that is energized when the steering switching valve 13 is switched in the steering switching mechanism F, and the driving motor 25 are activated by switching the front and reverse positions of the first and second operation valves 27 and 29. A travel motor circuit 24 that performs forward and reverse rotation, a forward/reverse switching valve 30 that switches between the first and second operating valves 27 and 29, and a normally closed relay that is turned on by excitation of the relay. Contact X
Turned off by excitation of a, Xc and relay X
A transportable upper swing vehicle characterized by comprising a control circuit G that switches and operates a forward/reverse switching valve 30 in combination with operating normally open relay contacts Xb, Xd and the forward/reverse operation of a forward/reverse switching switch 39. driving equipment.