公开(公告)号：US20030066416A1

公开(公告)日：2003-04-10

申请号：US09974612

申请日：2001-10-09

Applicant: Delphi Technologies, Inc.

Inventor： Derek T. Dreischarf ,  Michael W. Fanelli

IPC: F15B009/10

CPC classification number: B60T13/57

Abstract: A pneumatic brake booster includes a generally cylindrical shaped piston. The piston has a first piston end and a second piston end and defines a chamber at the first piston end and a piston bore at the second piston end separated by an air flow aperture. The piston bore includes a plunger aperture located at the second piston end. A plunger includes a first plunger end and a second plunger end and is movable between first and second positions. The second plunger end is located within the plunger aperture. An air valve has a first valve end and a valve second end and is movable between first and second positions and defines a valve bore for receiving the first plunger end. A collapsing spring is located within the valve bore and is adapted to couple the plunger and the air valve. The plunger and air valve are spaced apart a first relative distance in response to the pneumatic brake booster being in a regular apply mode and spaced apart a second relative distance in response to the pneumatic brake booster being in a panic apply mode.