Air scavenging carburetor

US8453998B2 · kind B2 · utility

Assignee

• WALBRO ENGINE MANAGEMENT, L.L.C. · US

Inventors

• George M. Pattullo · Caro, US
• Thomas Schmidt · Heidelberg, DE
• David L. Thomas · San Jose, US

Key dates

• Filing date: Aug 17, 2010
• Grant date: Jun 4, 2013
• Expiry date: Jul 27, 2031

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2009/0205
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In one form, a carburetor may include an air passage, a fuel and air mixing passage, a throttle valve, an air valve and a lost motion coupler interconnecting the air valve and the throttle valve. The throttle valve may be disposed in communication with the fuel and air mixing passage and moveable between an idle position and an open position permitting an at least somewhat less restricted fluid flow therethrough than when the throttle valve is in the idle position. The air valve may be disposed in communication with the air passage, and moveable between closed and fully open positions to control air flow through the air passage. The lost motion coupler may permit a limited movement of the throttle valve away from its idle position without a corresponding movement of the air valve, and may also permit movement of the air valve along with the throttle valve after said limited movement and until the air valve is fully open, and may also permit further movement of the throttle valve to its wide open position after the air valve is fully open.