| 摘要 |
A seal for a brake booster is provided to reduce noise and improve durability by reducing frictional resistance and distributing stress between the first and second main lips and a valve body. A seal, applied to a brake booster including a valve body(14), which seals between the rear shell and the valve body comprises as follows. A seal body(110) is interposed between the rear shell and the valve body and supported to the rear shell. A first main lip(120) is protruded along the circumference of the valve body from the seal body toward the valve body. A second main lip(130) is protruded along the circumference of the valve body from the seal body toward the valve body. In addition, a plurality of protrusion bands(140) is protruded between the first and second main lips toward the valve body to reduce frictional resistance between the first and second main lips and the valve body and distribute stress between them. |
