| 摘要 |
A temperature compensated carburetor including a composite valve member comprising a bi-metal strip and a gate valve needle for varying the effective flow cross-sectional area of the main and/or idle fuel supply duct to modulate the flow rate of fuel to the carburetor venturi mixing passage. The bi-metal strip generates substantially all of temperature-change-induced movement of the valve needle. The needle may be made of brass or aluminum, or alternatively of plastic material having a much greater coefficient of expansion than the aluminum carburetor body in which it is adjustable mounted such that differential linear expansion and contraction of the valve needle itself, as well as that of the bi-metal, relative to the carburetor body in response to ambient temperature changes varies the flow-controlling cross-sectional area of the fuel duct inversely relative to ambient temperature changes. A needle cylindrical mounting portion at one end is threadably secured in the strip movable free end. A reduced diameter needle body extension extends axially away from the needle mounting end and has cylindrical stem portion slidable in another bore of the carburetor body. The composite valve member is unrestrained in the direction of its movement from the needle free end to the strip fixed end fastened to the carburetor body. The needle free end is thus movable in a fuel feeding control passageway of the fuel duct to thus vary the flow controlling cross-section thereof. |
