DRAINAGE DEVICE FOR ENGINE AIR SUPPLY SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a drainage device for engine air supply system capable of automatically extracting condensed water within an air supply system passage by a drain valve of a simple structure and preventing lowering of air supply pressure while operating an engine. SOLUTION: In an engine air supply system for supplying air supply from a supercharger 5 into a cylinder via an air supply system passage from an inter cooler 6 to an air supply manifold 2, a drain passage 22 for discharging condensed water is formed on the air supply system passage and the drain valve 20 is connected with the drain passage 22. The drain valve 20 keeps an opened state by an energizing means such as a coil spring 27 when stopping an engine and closes against elastic force of the coil spring 27 by air supply pressure of the air supply system passage during the operation of the engine. As a result, a water hammer phenomenon is prevented and lowering of air supply pressure during the operation is prevented.