Patent ID: 9555787
Date: 2017-01-31
CPC Classifications: B60T,Y10T

Claim:
1. A vehicle brake booster comprising: a brake input member configured to receive a braking input force; a booster housing divided into a first chamber adjacent the brake input member and a second chamber remote from the brake input member; a poppet valve including a poppet valve body and a poppet seal, the poppet valve being operable to maintain separation between air having a pressure in the first chamber and a vacuum in the second chamber during assisted braking and further being operable to enable evacuation of the air from the first chamber through one or more side ports of the poppet valve body upon release of the braking input force and completion of the assisted braking; and a restrictor element separate from the poppet valve body and configured to provide a predetermined release speed for the booster; wherein the one or more side ports define a total flow resistance of the poppet valve body which is less than an effective total flow resistance of the poppet valve body set by the restrictor element, wherein the poppet valve body includes a plurality of side ports, and the restrictor element restricts less than all of the plurality of side ports, and wherein the restrictor element includes at least one restriction portion provided as a plug to block one of the plurality of side ports.