| 摘要 |
A brake booster of a vehicle is provided to firmly settle a head unit of a rear bolt on a rear cell by entirely accommodating and surrounding a hole formed in the rear cell with a glove formed in the head unit of the rear bolt. A brake booster of a vehicle comprises a casing(10) which is formed by tightly coupling a front cell(10A) to a rear cell(10B). Power pistons(13B,13D) and diaphragms(13A,13C) are provided to separate an inside of the casing(10) into uniform pressure chambers(12A,12C) and variable pressure chambers(12B,12D). The brake booster comprises a valve(16), control plungers(P1,P2), an input axis(14), an output axis(15), and a rear bolt(20) which is fixed to a hole formed in the rear cell(10B). The rear bolt(20) includes a head unit, which entirely accommodates and surrounds the hole formed in the rear cell(10B) and settles on a circumference of the hole, and a bolt unit, which extends from the head unit through the hole. |
