Carburetor for internal combustion engine

US4078024A · kind A · utility

Assignee

• Societe Industrielle de Brevets et d'Etudes (S.I.B.E.) · FR

Inventors

• Wilfried Bockelmann
• Georg Faltermeier

Key dates

• Filing date: Apr 5, 1977
• Grant date: Mar 7, 1978
• Expiry date: Apr 5, 1997

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M1/10
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A carburetor has an operator operable butterfly valve and an auxiliary throttle located upstream of the butterfly valve. The auxiliary throttle is urged toward closure by temperature sensitive thermostatic means and is urged toward opening by the airflow drawn by the engine. A pneumatic element subjected to the pressure downstream of the butterfly valve opens the auxiliary throttle to a predetermined extent immediately after cranking. A pneumatic device responsive to the depression downstream of the butterfly valve urges the auxiliary throttle toward closure when the butterfly valve is abruptly opened while the engine is cold. The action of that pneumatic device is of short duration, and consequently the auxiliary throttle returns to its partially open position as acceleration proceeds.