| 摘要 |
<p>PURPOSE:To supply brake liquid of a low pressure and a big quantity at an initial stage of a braking operation, thereafter, the same of a high pressure and a small quantity by arranging a large diametral driven piston and a small diametral drive piston coaxially within a cylinder main body and providing within the driven piston with a stepped piston. CONSTITUTION:When a drive piston 4 is moved to the left in order to operate a brake, a driven piston 37 is moved to the left against a spring 28 by a pressurized liquid because a chamber 3 is closed up tightly. Then, when a cup seal 24 closes an inlet passageway 9, the liquid pressure is entered into an annular groove through a passageway 35 equipped with a cup seal 29 and is passed through on outside of the annular groove by deflecting the cup seal 29 inwardly, thereafter, is sent with pressure to an outlet port 33. Thereby, brake liquid of a low pressure and a big quantity is supplied to a brake device. Thereafter, when the piston 4 is moved to the left succeedingly, a stepped plunger 26 is moved to the left by the increased liquid pressure and a passageway 31 is opened, thereby, the brake liquid having higher pressure is supplied to the brake device.</p> |
