[go: up one dir, main page]

US2643865A - Carburetor for internal-combustion engines - Google Patents

Carburetor for internal-combustion engines Download PDF

Info

Publication number
US2643865A
US2643865A US180964A US18096450A US2643865A US 2643865 A US2643865 A US 2643865A US 180964 A US180964 A US 180964A US 18096450 A US18096450 A US 18096450A US 2643865 A US2643865 A US 2643865A
Authority
US
United States
Prior art keywords
needle
fuel
throttle
valve
combustion engines
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US180964A
Other languages
English (en)
Inventor
Cyril R B Smith
Frank H T Izon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amal Ltd
Original Assignee
Amal Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Amal Ltd filed Critical Amal Ltd
Application granted granted Critical
Publication of US2643865A publication Critical patent/US2643865A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M9/00—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position
    • F02M9/02—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position having throttling valves, e.g. of piston shape, slidably arranged transversely to the passage
    • F02M9/06—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position having throttling valves, e.g. of piston shape, slidably arranged transversely to the passage with means for varying cross-sectional area of fuel spray nozzle dependent on throttle position

Definitions

  • the object of the present invention is to provide a carburettor of the kind having no associated fuel reservoir, wherein the aforesaid disadvantages are simply and effectively overcome.
  • needle valve for regulating the flow of fuel through a metering orifice characterised in that the needle is also adapted to co-act with a seating to shut off the fuel supply to said orifice when the throttle is fully closed, and to open said fuel supply prior to the throttle being opened.
  • a taper needle valve 1 adapted o travel with the aid h ottle sleev s, i ar ranged to (30-34315 with a spray nozzle 8 to regulate the. amount of fuel passin therethrough according tothe amount of; throttle opening.
  • the taper needle 7 is secured within a slidable, needle block 9.
  • sai block bein disposed withi e o w centre o th throttle sle ve 4 an h n d passing through an aperture il in the bottom of the hollow portion.
  • a screw threaded retaining collar I2 is secured in the top of the throttle sleeve in order to prevent the needle block from leaving the sleeve under the action of the said spring ID.
  • the top of the needle block is adapted to house the nipple of the Bowden cable.
  • a further and stronger spring I3 retained by a screwed cap [4 is adapted to co-act with the said needle block 9 in order to urge it downwards in opposition to the lighter spring Ill.
  • the free end of the taper needle is further tapered at l5 and adapted to engage and co-act with an annular valve seating l6, which seating is secured to the lower end of the spray nozzle by a fuel jet ll having a metering orifice Hi. It is arranged that when the throttle sleeve 4 is fully closed (as illustrated), the stronger spring 13 forces the taper needle into contact with the valve seat It to cut-off the supply of fuel to the spray nozzle 8. It is further arranged that in this closed position, a slight ap I9 exists between the bottom of the retaining collar l 2 and the top of the needle block 9.
  • the Bowden control system when operated to open the throttle, it acts directly upon the needle block 9 and lifts the needle from the valve seating l6 before there is anymovement of the throttle sleeve 4. y In this way, fuel is allowed to enter the spray nozzle immediately prior to any admittance of air, and a weak starting mixture is avoided. Conversely, afterthe throttle is shut, the needle block 9 and needle 7 are urged further downwards until the end of the taper needle engages the valve seat [6 and effectively cuts off the supply of fuel.
  • the valve seating is preferably made of a softer material than the needle and may, for example, be made from fibre, hard rubber, or plastics material.
  • the size of the metering orifice I8 within the fuel jet depends upon the size of the engine with which it is to be used and various other conditions, but is, of course, of such a size that the engine is neither starved of fuel nor supplied with a rich mixture under normal throttle conditions.
  • a carburettor as hereinbefore described and illustrated is admirably suitable for lightweight engines of the kind described, and in these cases would probably be approximately half the size of that shown in the illustration.
  • a further advantage is that the carburettor functions in any position, whether the throttle sleeve is operating vertically or horizontally, or in any intermediate position. It is even possible for it to work in the invert position i. e. with the fuel jet uppermost. It will be seen that this is an added advantage over the conventional or float-chamber type where the float chamber has to be arranged in a definite position to prevent flooding.
  • a carburettor for internal combustion engines having in combination a substantially vertical tubular body portion, a substantially horizontal induction chamber disposed therethrough, an air throttle sleeve arranged slidably within said body portion, a taper needle fuel valve arranged slidably within the throttle sleeve, and adapted to regulate the flow of fuel through a metered orifice, the lower tip of said needle being adapted to cooperate with a valve seating to constitute a shutoff valve for the supply of fuel to said orifice, said throttle sleeve being resiliently mounted in relation to said needle valve, means for actuating said needle valve, an abutment associated with said needle valve, an abutment associated with said throttle sleeve, said abutments being slightly spaced from each other when said needle valve is in fuel shut-ofi position, and said abutments being disposed for engagement after initial movement of said needle valve from fuel shut-off position, whereby subsequent movement of said needle valve effects simultaneous movement of said throttle valve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Fuel-Injection Apparatus (AREA)
US180964A 1949-09-05 1950-08-23 Carburetor for internal-combustion engines Expired - Lifetime US2643865A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2643865X 1949-09-05

Publications (1)

Publication Number Publication Date
US2643865A true US2643865A (en) 1953-06-30

Family

ID=10912511

Family Applications (1)

Application Number Title Priority Date Filing Date
US180964A Expired - Lifetime US2643865A (en) 1949-09-05 1950-08-23 Carburetor for internal-combustion engines

Country Status (2)

Country Link
US (1) US2643865A (de)
DE (1) DE847669C (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2786658A (en) * 1954-05-24 1957-03-26 Duriez Pierre Carburetors
US2987304A (en) * 1959-09-21 1961-06-06 Robert F Roy Carburetor
US20070246846A1 (en) * 2006-04-25 2007-10-25 Honda Motor Co., Ltd. Carburetor equipped with needle jet

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1238719B (de) * 1959-04-07 1967-04-13 J Gurtner Sa Des Ets Kolbenschiebervergaser

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB213307A (en) * 1922-11-27 1924-03-27 John Robert Hamilton Improvements in or connected with carburettors for internal combustion engines
GB217447A (en) * 1923-07-11 1924-06-19 Brown & Barlow Ltd Improvements in or relating to carburetters for internal-combustion engines
US2062496A (en) * 1933-12-22 1936-12-01 Brokel Otto Carburetor
US2499554A (en) * 1944-10-13 1950-03-07 Bendix Aviat Corp Charge forming device
US2521421A (en) * 1946-10-12 1950-09-05 Leonard J Spranger Constant air velocity carburetor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB213307A (en) * 1922-11-27 1924-03-27 John Robert Hamilton Improvements in or connected with carburettors for internal combustion engines
GB217447A (en) * 1923-07-11 1924-06-19 Brown & Barlow Ltd Improvements in or relating to carburetters for internal-combustion engines
US2062496A (en) * 1933-12-22 1936-12-01 Brokel Otto Carburetor
US2499554A (en) * 1944-10-13 1950-03-07 Bendix Aviat Corp Charge forming device
US2521421A (en) * 1946-10-12 1950-09-05 Leonard J Spranger Constant air velocity carburetor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2786658A (en) * 1954-05-24 1957-03-26 Duriez Pierre Carburetors
US2987304A (en) * 1959-09-21 1961-06-06 Robert F Roy Carburetor
US20070246846A1 (en) * 2006-04-25 2007-10-25 Honda Motor Co., Ltd. Carburetor equipped with needle jet
US7637483B2 (en) * 2006-04-25 2009-12-29 Honda Motor Co., Ltd. Carburetor equipped with needle jet

Also Published As

Publication number Publication date
DE847669C (de) 1952-08-25

Similar Documents

Publication Publication Date Title
US3706444A (en) Carburettor for motor vehicle
US2733902A (en) phillips
US2643865A (en) Carburetor for internal-combustion engines
US2633342A (en) Automotive carburetor
US2653804A (en) Fuel metering control for injection carburetors
US2998232A (en) Carburation devices for internal combustion engines
US1963458A (en) Carburetor
US2271116A (en) Carburetor
US1958818A (en) Carburetor
US2271113A (en) Carburetor
US2130884A (en) Carburetor
US3136827A (en) Carburetor
US2362145A (en) Carburetor for internal-combustion engines
US1356661A (en) Carbureter
US1944547A (en) Carburetor
US2155560A (en) Carburetor
GB528939A (en) Improvements in carburettors for internal-combustion engines
US1970601A (en) Carburetor
US3078078A (en) Carburetor
US2269949A (en) Carburetor
US2036431A (en) Carburetor
US1872374A (en) Carburetor
US2014763A (en) Carburetor
US1933395A (en) Carburetor
US1265194A (en) Carbureter.