JPH0296459U

JPH0296459U -

Info

Publication number: JPH0296459U
Application number: JP530489U
Authority: JP
Priority date: 1989-01-19
Filing date: 1989-01-19
Publication date: 1990-08-01

Description

[Brief explanation of drawings]

第１図は請求項１に係る考案の第１実施例を示
す要部拡大断面図、第２図は同考案の第２実施例
を示す要部拡大断面図、第３図は請求項２に係る
考案の実施例を示す要部拡大断面図である。１…吸気通路、３…フロート室、５…ポンプ、
５ａ…ポンプ室、９…インレツトチエツク弁、１
０…アウトレツトチエツク弁、１３…戻し通路、
１４…感温弁、１６……補助チエツク弁、１５ｂ
，１６ｂ…弁座、１５ｃ，１６ｃ…チエツク弁体
、１５ｄ，１６ｄ…スプリング。 FIG. 1 is an enlarged sectional view of a main part showing a first embodiment of the invention according to claim 1, FIG. 2 is an enlarged sectional view of a main part showing a second embodiment of the invention, and FIG. FIG. 2 is an enlarged sectional view of a main part showing an embodiment of the invention. 1...Intake passage, 3...Float chamber, 5...Pump,
5a...Pump chamber, 9...Inlet check valve, 1
0...Outlet check valve, 13...Return passage,
14...Temperature-sensitive valve, 16...Auxiliary check valve, 15b
, 16b...Valve seat, 15c, 16c...Check valve body, 15d, 16d...Spring.

Claims

[Scope of Claim for Utility Model Registration] 1. The pump chamber is communicated with the float chamber via an inlet check valve, and is also communicated with an acceleration nozzle that opens into the intake passage via an outlet check valve, thereby increasing the volume of the pump chamber. The fuel sucked into the pump chamber from the pump chamber is injected from the acceleration nozzle by reducing the volume of the pump chamber, and a return passage is provided that communicates the pump chamber with the space above the oil level of the float chamber. In an accelerating fuel supply system for a carburetor, which is equipped with a temperature-sensitive valve that shuts off the oil and conducts it when the temperature is high, the flow from the space above the oil surface of the float chamber toward the pump chamber is blocked in the return passage, and the flow in the opposite direction is prevented. 1. An accelerating fuel supply system for a carburetor, characterized in that an auxiliary check valve for allowing flow is provided, and the cracking pressure of the auxiliary check valve is set to be lower than the cracking pressure of the outlet check valve. 2. The pump chamber is communicated with the float chamber via an inlet check valve, and is also communicated via an outlet check valve with an acceleration nozzle that opens into the intake passage, so that fuel is drawn from the float chamber into the pump chamber by expanding the volume of the pump chamber. is ejected from an accelerating nozzle by reducing the volume of the pump chamber, and a return passage is provided that communicates the pump chamber with the space above the oil surface of the float chamber, and the return passage is closed off when the temperature is low and conductive when the temperature is high. In the accelerating fuel supply device for a carburetor provided with a temperature valve, the temperature-sensitive valve touches and separates from a valve seat provided in the return passage to prevent a flow from the space above the oil surface of the float chamber toward the pump chamber. An auxiliary check valve consisting of a check valve element that allows flow in the opposite direction and a spring made of a shape memory alloy that urges the check valve element in the direction of contacting the valve seat is provided, and the check valve is not cracked. When the pressure is high, the spring recovers its memorized shape and the pressure becomes lower than the cracking pressure of the outlet check valve, and when the pressure is low, the pressure becomes higher than the ejection pressure from the pump chamber. Acceleration fuel supply device.