| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a vacuum type booster capable of reducing a servo ratio of a low load servo area to approximately 1. <P>SOLUTION: A reaction force from a reaction member 34 is divided, transmitted to a front shaft 32a of a plunger 32 via a contact member 33, and transmitted to a flange 32b of the plunger 33 via a spring unit 40. The spring unit 40 comprises a first tubular holding member 41 assembled to the front shaft 32a of the plunger and engaged with the reaction member 43 at a front end with the same diameter as the outside diameter of the reaction member 43, a second holding member 42 assembled to an outer periphery of its rear end and engaged with the flange 32b at a rear end extending backward from the first holding member 41, and a Belleville spring 43 assembled to the outer periphery of the first holding member 41 and held between the holding members 41 and 42. When reaction force acting on the holding member 41 from the reaction member exceeds the load of the Belleville spring 43, the first holding member 41 makes the Belleville spring 43 flexure to move, and engages with a step part 22g of a valve body 22. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
