Patent ID: 7503544
Filing Date: 2009-03-17
Classification: F02D,F16K

Abstract:
1. A flap valve for a motor vehicle exhaust system, the flap valve comprising: a valve housing having a central longitudinal axis, an inner cross-sectional area, an outside and a first orifice; a bearing housing mounted gas-tightly on said outside of said valve housing, said bearing housing having an inner wall region and a second orifice delimited by said inner wall region; a shaft extended transversely relative to said central longitudinal axis of said valve housing, said shaft projecting through said first orifice in said valve housing into said bearing housing and emerging from said bearing housing again through said second orifice in said bearing housing, said shaft having a central longitudinal axis, said shaft having a radial shoulder and said shaft being formed of a material having a thermal expansion; a valve flap pivotable in said valve housing about said shaft between a closing position covering said inner cross-sectional area and an opening position uncovering said inner cross-sectional area; a bearing ring surrounding said shaft within said bearing housing, said bearing ring having a supporting surface pointing toward said valve flap and oriented transversely relative to said shaft and a sliding surface pointing away from said valve flap and cooperating with said inner wall region of said bearing housing to provide a slide pairing, and said bearing ring having at least one region, including said sliding surface, being formed of a material with a lower thermal expansion than said material of said shaft; and at least one mineral fiber mat being compressed in direction of said central longitudinal axis of said shaft and provided as a spring element surrounding said shaft in said bearing housing for exerting a force in the direction of said central longitudinal axis of said shaft, said at least one mineral fiber mat being supported on said supporting surface of said bearing ring and indirectly or directly on said radial shoulder of said shaft, wherein the exerted force acts on said bearing ring to sealingly press said sliding surface of said bearing ring against said inner wall region of said bearing housing.