| 摘要 |
<p>PURPOSE:To obtain a hydraulic booster which can change boosting ratio by duplicating an operation rod. CONSTITUTION:The operating rod 31 is duplicated so as to consist of two rods 63 and 64. The second rod 63 freely slides in the thru hole of the first rod 64. This second rod 63 slides by stepping in the brake pedal 19 and this slide permits the spool 43 to be pressed. For this reason, suppose that the cross section of the piston 29 is A2 and the respective cross sections of the first and second rods 63 and 64 are A1 and A3. The boosting hydraulic pressure which is generated in the boosting room 45 of the hydraulic booster 4 is applied to the power piston 29, i.e. the cross section of (A2-A3+A1). A brake master cylinder is boosting actuated in accordance with the boosting ratio (A2-A3+A1)by the actuation force generated by this hydraulic pressure. This boosting ratio can arbitrarily be set by changing the combination of the first and second rods 64 and 63.</p> |
