| 摘要 |
PURPOSE: A valve return spring comprising a filter supporter for a pneumatic brake booster assembly is provided to remove the pressure unbalance between a vacuum chamber and an operation chamber through operating a controlling device with force amplified by a valve return spring comprising. CONSTITUTION: A pneumatic brake booster comprises a filter(124) and a return spring(120). The return spring is composed to support the filter. The return spring comprises a dead coil installed in one side of the return spring. The dead coil comprises a live coil installed in one side of the return spring. The dead coil is located in the outside of live coil diameter and contacted to the filter. |
