IC engine with sectional cooling of valve seat rings - has cooling duct reducing ring on central section of valve seat ring free w.r.t. cylinder head

摘要

Each IC engine exhaust valve seat ring (2) has a peripheral cooling duct in the centre section (2c). Concentrically to valve seat ring is fitted a filling ring (6), reducing the duct flow cross-section, and set free w.r.t. the cylinder head (1). Pref. the filling ring consists of two parts welded together. At its front side edge regions, the filling ring has cylindrical flanges coupled to a cylindrical web by conical or annular straps with bores. The flanges may have recesses, extending up to the adjacent strap. Alternatively they have radially outwards deformed curvatures. USE/ADVANTAGE - For IC engines with catalytic exhaust treatment. Provides for improved cooling in the thermally stressed regions.