Hydraulic drive type working vehicle

Details Hydraulic drive type working vehicle Hydraulic drive type working vehicle

1998-12-03

2000-09-26

Lillis, Eileen Dunn

Excavating

Road grader-type

Condition responsive

37414, 60388, 60393, 90358R, E02F 500

Patent

active

061228486

ABSTRACT:
A hydraulic drive type working vehicle, with speedy responsiveness in an excavating operation, includes: a pouring changeover valve (10), which is switchable between (a) a pouring position, wherein pressurized oil of a travel hydraulic circuit (5) is poured into a working machine hydraulic circuit (8), and (b) a shutoff position, wherein the travel hydraulic circuit (5) and the working machine hydraulic circuit (8) are isolated from each other; a first changeover valve (16), which is switchable from its shutoff position to its communicating position when the oil pressure of the travel hydraulic circuit (5) exceeds a predetermined oil pressure; a pouring command switch (14); and a second changeover valve (17), which is connected in series with the first changeover valve (16) and which is switchable from its shutoff position to its communicating position upon receipt of a pouring command from the pouring command switch (14); and wherein the pouring changeover valve (10) is switchable to the pouring position when the oil pressure of the travel hydraulic circuit (5) exceeds the predetermined oil pressure and the pouring command is outputted.

REFERENCES:
patent: 5081838 (1992-01-01), Miyaoka et al.
patent: 5178510 (1993-01-01), Hanamoto et al.
patent: 5277269 (1994-01-01), Ichimura et al.
patent: 5392539 (1995-02-01), Hirata et al.
patent: 5446979 (1995-09-01), Sugiyama et al.

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