| 摘要 |
<P>PROBLEM TO BE SOLVED: To smooth the operation and stabilize the output of a negative pressure type booster for a hydraulic braking device being a non-stroke-depending type, which amplifies the braking operating force by utilizing the negative pressure of an engine, and operates the master cylinder by the amplified force. <P>SOLUTION: The airtight sealing between a power piston 16 and a valve piston 15 which can relatively move in the axial direction to the power piston 16, and between a plunger 14, which is connected with an input shaft 12, and the valve piston 15 is respectively performed by rolling seals 26, 27 and 28. Thus, the problems occurring when the airtight sealing is performed by a sliding seal, such as the awkward movement and the inaccuracy of the valve piston 15, are eliminated, and the output is stabilized. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
