| 摘要 |
The invention relates to a throttle-valve assembly (10) comprising a housing (12) that has a throttle opening (16), through which a gaseous medium (62) can flow in a main direction of flow (60 ). According to the invention, a throttle-valve (20), which is pivotally mounted on a throttle-valve shaft (18), is arranged inside the throttle opening (16), and the throttle-valve shaft (18) can be pivoted by an actuator (26) arranged inside the housing (12). Starting from the rotational axis (19) of the throttle-valve shaft (18) downstream along the main direction of flow (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 a calotte section (68) is connected to said approximate ly straight cylinder section (64). The inventive throttle-valve assembly should reliably ensure a finely graduated control of the gaseous medium (62) passing through the throttle opening (16) during the operation of the thrott le- valve assembly (10). To this end, the calotte section (68) has a center (80) that, starting from the rotational ax is (19) of the throttle-valve shaft (18) downstream along the main direction of flow (60) of the gaseous medium (62), is shifted by an interval H2, whereby the calotte section (68) has a radius RK, which is approximately determined by the following equation: RK = [RZ2 + (H1 - H2)2]?.
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