Auxiliary fuel and air supply in a carburetor
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-007/08
F02M-007/00
출원번호
US-0518037
(2006-09-08)
등록번호
US-7467785
(2008-12-23)
발명자
/ 주소
Braun,Matthew A.
출원인 / 주소
Walbro Engine Management, L.L.C.
대리인 / 주소
Reising, Ethington, Barnes, Kisselle, P.C.
인용정보
피인용 횟수 :
6인용 특허 :
8
초록▼
A carburetor includes a fuel and air mixing passage with a throttle valve therein, and a bore with a valve therein defining in part a valve actuation chamber and a separate fuel and air mixing chamber in communication with the fuel and air mixing passage at a location downstream of the throttle valv
A carburetor includes a fuel and air mixing passage with a throttle valve therein, and a bore with a valve therein defining in part a valve actuation chamber and a separate fuel and air mixing chamber in communication with the fuel and air mixing passage at a location downstream of the throttle valve. A fuel passage and an air passage are in communication with the fuel and air mixing chamber. A purge apparatus is in communication with the valve actuation chamber and is operable to move the valve to an open position to open the fuel and air passages to the fuel and air mixing chamber such that a fuel and air mixture may flow from the fuel and air mixing chamber to the fuel and air mixing passage downstream of the throttle valve.
대표청구항▼
What is claimed is: 1. A carburetor, comprising: a body having a fuel and air mixing passage with a throttle valve in the fuel and air mixing passage, and a bore with a valve in the bore and defining in part a valve actuation chamber and a separate fuel and air mixing chamber communicating with the
What is claimed is: 1. A carburetor, comprising: a body having a fuel and air mixing passage with a throttle valve in the fuel and air mixing passage, and a bore with a valve in the bore and defining in part a valve actuation chamber and a separate fuel and air mixing chamber communicating with the fuel and air mixing passage at a location downstream of the throttle valve; a fuel passage in communication with the fuel and air mixing chamber; and a purge apparatus in communication with the valve actuation chamber and being operable to move the valve within the bore to an open position so that the fuel passage may communicate with the fuel and air mixing chamber and fuel and air may flow from the fuel and air mixing chamber to a location in the fuel and air mixing passage downstream of the throttle valve. 2. The carburetor of claim 1, further comprising an air passage in communication with the fuel and air mixing chamber. 3. The carburetor of claim 2, wherein the air passage is in communication with the fuel and air mixing passage upstream of the throttle valve. 4. The carburetor of claim 1, further comprising a fuel chamber, and a check valve in communication with the fuel passage between the fuel chamber and the fuel and air mixing chamber. 5. The carburetor of claim 1, wherein the valve of the bore includes a seal separating the fuel and air mixing chamber from the valve actuation chamber. 6. The carburetor of claim 1, further comprising a fuel chamber, wherein the purge apparatus includes a purge bulb and a purge valve having an inlet and an outlet, such that repeated depression and release of the purge bulb draws fuel from the fuel chamber through the inlet of the purge valve and into the purge bulb, and expels fuel from the purge bulb through the outlet of the purge valve and into the valve actuation chamber. 7. The carburetor of claim 6, further comprising a return fuel passage in communication with the valve actuation chamber, wherein repeated depression and release of the purge bulb expels fuel from the valve actuation chamber and out of the carburetor through the return fuel passage. 8. The carburetor of claim 1, wherein the valve includes at least one passage therein. 9. The carburetor of claim 8, further comprising a throttle shaft carrying the throttle valve, wherein the throttle shaft includes a passage therein in communication with the at least one passage of the valve. 10. The carburetor of claim 9, further comprising a passage extending between the bore and a location within the fuel and air mixing passage downstream of the throttle valve. 11. An auxiliary fuel and air supply apparatus for a diaphragm carburetor with a fuel and air mixing passage having a throttle valve located therein downstream of an air intake opening of the fuel and air mixing passage, the apparatus comprising: a bore having a fuel and air mixing valve disposed therein defining in part a valve actuation chamber and a separate fuel and air mixing chamber communicating with the fuel and air mixing passage at a location downstream of the throttle valve; a fuel chamber; a fuel passage having an upstream end in communication with the fuel chamber and a downstream end in communication with the fuel and air mixing chamber; an air passage having an upstream end in communication with the fuel and air mixing passage at a location upstream of the throttle valve and further having a downstream end in communication with the fuel and air mixing chamber; a return fuel passage having an upstream end in communication with the valve actuation chamber; a purge passage in communication with the valve actuation chamber; and a fuel chamber purge apparatus including a purge bulb at least partially surrounding a purge valve having an inlet in communication with the fuel chamber and an outlet in communication with the valve actuation chamber via the purge passage, wherein upon actuation of the purge bulb fluid pressure moves the fuel and air mixing valve to communicate the fuel and air mixing passage with the air and fuel passages. 12. The auxiliary fuel and air supply apparatus of claim 11, wherein the fuel and air mixing passage includes a venturi in communication with the fuel chamber. 13. The auxiliary fuel and air supply apparatus of claim 11, wherein the valve of the bore includes a seal separating the fuel and air mixing chamber from the valve actuation chamber. 14. The auxiliary fuel and air supply apparatus of claim 11, further comprising a check valve in communication with the fuel passage between the fuel chamber and the fuel and air mixing chamber. 15. The auxiliary fuel and air supply apparatus of claim 11, wherein the air passage is in communication with the fuel and air mixing passage upstream of the throttle valve. 16. The auxiliary fuel and air supply apparatus of claim 11, wherein the fuel chamber purge apparatus includes a purge bulb and a purge valve having an inlet and an outlet, such that repeated depression and release of the purge bulb draws fuel from the fuel chamber through the inlet of the purge valve and into the purge bulb, and expels fuel from the purge bulb through the outlet of the purge valve and into the valve actuation chamber. 17. The auxiliary fuel and air supply apparatus of claim 16, further comprising a return fuel passage in communication with the valve actuation chamber, wherein repeated depression and release of the purge bulb expels fuel from the valve actuation chamber and out of the carburetor through the return fuel passage. 18. The auxiliary fuel and air supply apparatus of claim 11, wherein the valve includes at least one passage therein. 19. The auxiliary fuel and air supply apparatus of claim 18, further comprising a throttle shaft carrying the throttle valve, wherein the throttle shaft includes a passage therein in communication with the at least one passage of the valve. 20. The auxiliary fuel and air supply apparatus of claim 19, further comprising a fuel and air outlet passage extending between the bore and a location within the fuel and air mixing passage downstream of the throttle valve. 21. A diaphragm carburetor comprising: a body; an air inlet in the body; a fuel and air mixture outlet in the body; a fuel and air mixing passage through the body between the air inlet and the fuel and air mixture outlet; a throttle shaft carried by the body, extending across the fuel and air mixing passage, and including a passage therein; a throttle valve disposed in the fuel and air mixing passage between the air inlet and fuel and air mixture outlet and carried by the throttle shaft; an auxiliary fuel and air mixing chamber carried by the body; a fuel metering assembly carried by the body and defining a fuel chamber; an auxiliary fuel inlet passage in communication with the mixing chamber and the fuel chamber to supply fuel to the mixing chamber; an auxiliary air inlet passage in communication with the auxiliary fuel and air mixing chamber and the fuel and air mixing passage at a location upstream of the throttle valve to supply air to the auxiliary fuel and air mixing chamber; an auxiliary fuel and air outlet passage in communication with the auxiliary fuel and air mixing chamber and the fuel and air mixing passage at a location downstream of the throttle valve to supply a mixture of fuel and air from the auxiliary fuel and air mixing chamber to the fuel and air mixing passage; a valve carried by the body in the auxiliary fuel and air mixing chamber defining in part a valve actuation chamber and being movable to a closed position and an open position to control flow of an auxiliary air and fuel mixture from the auxiliary fuel and air mixing chamber to the fuel and air mixing passage, wherein the valve includes at least one passage therein in communication with the passage in the throttle shaft; a fuel chamber purge passage in communication with the mixing chamber; and a fuel chamber purge apparatus carried by the body and in communication with the fuel chamber and the fuel chamber purge passage and being operable to move the valve to the open position, wherein the fuel chamber purge apparatus includes a purge bulb and a purge valve having an inlet and an outlet, such that repeated depression and release of the purge bulb draws fuel from the fuel chamber through the inlet of the purge valve and into the purge bulb, and expels fuel from the purge bulb through the outlet of the purge valve, into the valve actuation chamber thereby moving the valve, and ultimately out of the carburetor through a return fuel passage.
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이 특허에 인용된 특허 (8)
Kobayashi Takeshi (Yokohama JPX), Apparatus for supplying starting-fuel for a carburetor.
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