Helically shaped suction port for internal combustion engine

Abstract

Abstract PURPOSE: To provide a helically shaped suction port for an internal combustion engine which can generate strong whirling flows in a combustion chamber of the engine during low speed running of the engine and can keep its loading efficiency from lowering during high speed high load running of the engine. CONSTITUTION: During a suction stroke, fuel air mixture prepared in a carburettor is introduced into a combustion chamber 4 across a suction valve 5 by means of a helically shaped suction port 6. The suction port 6 consists of an entrance passage portion A having its axis slightly curved and having a rectangular cross section at its open end, and a helical portion B having its exit section 13 formed into a cylinder with its center axis coincident with a helical axis b of the helical portion B. Fuel air mixture whirlingly flows downwardly along the periphery of the helical portion B. Height H from an extreme end section of the top of the helical portion B to the lower end face of the exit section 13 is determined to be equal to or greater than the diameter of the exit section 13, and angle θ between an inclined face of an extreme end section 18a of a top wall and the top face of the exit section 13 is determined to be less than 20 degrees. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Kiyoshi Nakanishi
• 👤 Takeshi Okumura

Bibliographic Details