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. An upper side wall face part 16a of that side wall face 16 of the entrance passage portion A which is nearer to the helical axis b is formed into a downwardly directed inclined face and has a width which increases towards the helical portion B so that the side wall face 16 presents a down wardly directed inclined face across the whole width thereof where the entrance passage section A is connected to the helical portion B. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Kiyoshi Nakanishi
• 👤 Takeshi Okumura

Bibliographic Details