| 摘要 |
PURPOSE:To make an unloader valve device small-sized and improve its fitting workability by reasonably incorporating a relief valve returning an excess pressure liquid to the liquid tank side when the pressure of an accumulator exceeds the preset value in the unloader valve device used in a full-pressure liquid brake for a vehicle. CONSTITUTION:In an unloader valve device 40 integrally fitted to a fitting face 41a below a control valve device 41 for a two-system type brake, an accumulator side connecting hole 52 and a hydraulic pump side connecting hole 54 are provided beneath a body section 44, and a cylinder member 56 formed with a valve hole, a relief valve chamber 59 and a cylinder 60 is coupled with a left opening end 45 communicated to a cylinder 47. A spool valve 66 is inserted into the cylinder 47, and a relief liquid pressure chamber 69 is formed between the spool valve 66 and the cylinder member 56. A cylinder 73 is formed on the spool valve 66, the first relief valve 74 is slidably inserted over both cylinders 60 and 73, and the second relief valve 85 is incorporated in the first relief valve 74. |
