BRAKE BOOSTER WITH TUNABLE RELEASE

摘要

A vehicle brake booster includes a brake input member configured to receive a braking input force and 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 includes a poppet valve body and a poppet seal, the poppet valve operable to maintain separation between pressure and vacuum 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 A restrictor element provides a predetermined release speed for the booster. 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.

主权项

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.