Patent ID: 7918659
Filing Date: 2011-04-05
Classification: F04C

Abstract:
1. A vacuum pump for an engine, comprising: a stator; a chamber defined within said stator; at least one air inlet opening in said stator to said chamber; at least one oil inlet opening in said stator to said chamber; a first discharge opening in said stator to said chamber; at least one vane rotatably mounted inside said chamber, said vane being operable to generate a depression; a first one-way valve operating on a first discharge opening; at least one second discharge opening separate from said first discharge opening and at least one second one-way valve operating on said at least one second discharge opening; said at least one second discharge opening being dimensioned to discharge the corresponding oil flow rate introduced into said chamber at each rotation of said vane; and said at least one second discharge opening having a size such that it is completely occupied by the oil flow rate discharged at each rotation of said vane.