Patent ID: 6772730
Filing Date: 2004-08-10
Classification: B29L,F02D,F05C,F16K

Abstract:
A throttle-valve assembly (10) having a housing (12), which has a continuous throttle opening (16) through which a gaseous medium (62) can flow in a main flow direction (60), the throttle valve assembly further comprising:a throttle valve (20) fastened pivotably on a throttle-valve shaft (18) and being located in the throttle opening (16); an actuator (26) disposed in the housing (12) for pivoting the throttle-valve shaft (18); wherein starting from an axis of rotation (19) of the throttle-valve shaft (18) downstream along the main flow direction (60) of the gaseous medium (62), the throttle opening (16) has an approximately straight cylinder section (64) with a height H1 and a radius RZ, and wherein the throttle opening (16) includes a spherical-cap section (68) that adjoins the approximately straight cylinder section (64); the spherical-cap section (68) has a central point (80) displaced from the axis of rotation (19) of the throttle-valve shaft (18), downstream along the main flow direction (60) of the gaseous medium (62), by a distance H2; and the spherical-cap section (68) has a radius RK which is approximately determined by the following equation: RX=[RZ2+(H1âˆ’H2)2]1/2.