| 摘要 |
A ring-shaped duct, which is connected to a coolant circulating system, extends in a throttle valve housing in an air intake section of an internal-combustion engine. A ventilating pipe for the crankcase gases is connected to the throttle valve housing, is divided into branches in the throttle valve housing and leads into ventilating points in front of and behind the throttle valve. The coolant, which circulates in the ring-shaped duct, simultaneously prevents an icing of the throttle valve and of the ventilating points.
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