| 摘要 |
PURPOSE: A valve is provided to drive a cooling fan motor by using a conventional brake-pilot supply auxiliary pump without an additional oil hydraulic pump, to reduce production costs by substituting the brake-pilot supply valve with a sequence valve, a reducing valve, and a pilot shut-off valve, and to operate a pilot valve when an unloading valve is broken. CONSTITUTION: A main supply line(3) supplying the hydraulic oil of an auxiliary pump(2) is branched into a brake line(3a) supplying hydraulic oil to brakes(P1,P2) and accumulators(A1,A1-1,A2,A2-2,A3) and a pilot line(3b) supplying hydraulic oil to a pilot valve. An auxiliary line(4) supplying hydraulic oil to a cooling fan drive motor(M) is installed regardless of the main supply line. A reducing valve(5) and a pilot shut-off valve(6) are installed in the pilot line. A sequence valve(7) supplying hydraulic oil to the cooling fan motor when the line pressure of the auxiliary line is over a specific level is installed on the auxiliary line. Therefore, a cooling fan is driven with a brake-pilot supply pump without an additional auxiliary pump. As the structure of the brake-pilot supply valve is compacted, production costs are cut down.
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