| 摘要 |
PURPOSE: To supply sufficient pressure fluid to both of brake circuits by using an accumulator by extending a branch pipe branched from the downstream side of a valve of a main supply pipe up to other supply pipes and interposing a check valve on the downstream side of this branch point. CONSTITUTION: A pressure fluid accumulator 76 is connected with a pump 26 via a branch pipe 74, a cutoff valve 87 is interposed in a supply pipe 45 and further a check valve 45 is arranged. A branch pipe 101 is branched between the cutoff valve 87 and the check valve 100, the branch pipe 101 is extended up to a supply pipe line 46 and a check valve 102 is installed in the branch pipe 101. When a traction slip control is performed, directional control valves 84, 85 are closed, a directional control valve 87 is switched to an opened location, pressure fluid is delivered to branch pipes 47, 49 from a pressure fluid accumulator 76, and one or both of wheels 31, 33 of a drive shaft are decelerated. The supply of pressure fluid to a wheel brake cylinder of a non-drive wheel is prevented by valves 84, 85 of closed locations. Thus, fluid is supplied from an accumulator to both of brake circuits.
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