EP0069416A2 - Vergaser für Brennkraftmaschinen - Google Patents

Vergaser für Brennkraftmaschinen Download PDF

Info

Publication number: EP0069416A2
Authority: EP; European Patent Office
Prior art keywords: diffusers; carburetor; diffuser; shutter; carburetor according
Prior art date: 1981-07-02
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.): Granted

Application number

EP82200759A

Other languages

English (en)

French (fr)

Other versions

EP0069416B1 (de

EP0069416A3 (en

Inventor

Marco Dr. Ing. Morini

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.)

Individual

Original Assignee

Individual

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.)

1981-07-02

Filing date

1982-06-18

Publication date

1983-01-12

1982-06-18 Application filed by Individual filed Critical Individual

1983-01-12 Publication of EP0069416A2 publication Critical patent/EP0069416A2/de

1984-03-07 Publication of EP0069416A3 publication Critical patent/EP0069416A3/fr

1986-10-01 Application granted granted Critical

1986-10-01 Publication of EP0069416B1 publication Critical patent/EP0069416B1/de

Status Expired 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
- F02M11/00—Multi-stage carburettors, Register-type carburettors, i.e. with slidable or rotatable throttling valves in which a plurality of fuel nozzles, other than only an idling nozzle and a main one, are sequentially exposed to air stream by throttling valve
- F02M11/10—Register carburettors with rotatable throttling valves
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four

Definitions

the present invention relates to a carburetor for Otto cycle engines, of the type in which the fuel is kept at a constant level in a tank and it is introduced into the air flow sucked by the engine by effect of the vacuum produced by the flow in the restricted section of a Venturi tube diffuser.
the object of the present invention is to provide a carburetor which makes it possible to maintain, substantially under all operating conditions, a well-controlled supply, so as to ensure maximum efficiency, best combustion and minimization of atmospheric pollution. .
a carburetor of the type indicated in the preamble comprising more than two diffusers co-operating with a shutter whose active surface moves in a direction substantially perpendicular to the axis of said diffuses - seurs and presents passage openings formed in such a way that they uncover in succession said diffusers according to a pre-established law.
the diffusers intended to be discovered under different operating conditions may have different dimensions and / or may be fitted with nozzles of different sizes, which makes it possible to adapt the supply conditions in the best way to the different conditions. of operation, thereby introducing a further improvement in the carburetion and in the operation of the engine.
the various carburetor diffusers are preferably arranged with their parallel axes, and the shutter is flat and moves in a plane perpendicular to the axes of the diffusers.
the diffusers are arranged in arcs of a circle around a center, and the shutter is constituted by a disc rotating around said center and provided with arcuate passage openings.
the central zone of the carburetor, left free by the diffusers, can advantageously be occupied by a tank at constant level for feeding the jets, thus making the construction particularly compact.
a substantial simplification of the structu re can be obtained by using an overflow tank, in which the necessary charge of fuel is maintained by means of a weir through which the excess fuel supplied by the feed pump is returned to the tank by means of a recovery pump.
the diffusers are advantageously distributed in two groups, along arcs of circles opposite with respect to the center, and the rotary shutter has two opposite arcuate openings, arranged so that they discover alternately a diffuser which is located on an arc and a diffuser which is on the opposite arch.
Parts of the carburetor body not occupied by the diffusers can accommodate additional devices, if requested, such as a jet for operation at minimum speed, a recovery pump, etc.
the example shown refers to a reverse flow carburetor, with seven diffusers arranged in arcs of a circle and co-operating with a rotary shutter, with overflow tank, device for minimum operation and recovery pump, but, as as already said, these choices should not be considered as limiting the scope of the invention.
the structure of the carburetor shown mainly comprises a body 1, a distributor 2 arranged below the body 1, a manifold 4 and a cover 5.
the latter is applied to the body 1 by means of screws not shown, with the interposition of 'A flat seal 27;
the distributor 2 is fixed to the body 1 by teeth with elastic trigger 36 and with the interposition of a toroidal sealing gasket 37;
the manifold 4 is fixed to the distributor 2 by means of teeth with elastic release 38 and with the interposition of a toroidal sealing gasket 39.
these connection systems assume that the distributor 2 is formed of plastic material , which is made possible by the adoption of the principles of the invention.
the manifold 4 is intended to be shown on the suction manifold (not shown) of a carburetion engine, and above the cover 5 is intended to be mounted a suction air filter; to fix the latter's box, the cover 5 has threaded rods 25; the air filter is not shown.
the body 1 is traversed by a plurality of diffusers 6, in this case in number of seven, distributed over a circumference and forming two groups, respectively of four and three diffusers.
the diffusers 6 of the body 1 correspond, in the cover 5 and in the. distributor 2, holes, respectively 40 and 41, which extend the profile of the diffusers 6.
a small tube 12 suitably curved, at the opposite end of which is applied a nozzle 11.
the various nozzles 11 of the two groups of diffusers sink into respective tanks 35 and 34 which, through conduits 33 and 32, communicate with a central tank at constant level 30.
This tank is supplied by the pump d usual supply (not shown) through a connector 13, a fuel filter 15 and a flow metering nozzle 16.
the constant level is ensured by a weir 7, and the fuel supplied in excess is poured into an arcuate tank 31 , from where it passes to a connector 14 intended to be connected to a recovery pump (not shown), which returns unused fuel to the tank. Thanks to communications 32 and 33, the same constant level of the tank 30 is also established in the tanks 34 and 35 and submerges, with a preset load, the nozzles 11 of the tubes 12.
a rotary shutter formed by a disc 3 provided with two arcuate slots 18 and 19. These slots are arranged so that, in a position of the disc 3 (full opening), they leave all free diffusers 6 des. two groups, in another position (fully closed) they close all the diffusers, and, passing from this last position to the first, they gradually discover the first 6 'diffuser (belonging to the first group) and then, after having completely opened this first diffuser, they discover the second 6 "diffuser (belonging to the second group), then the third 6 "'diffuser (again belonging to the first group) and so on.
the diffusers 6 are illustrated as all equal, they can have different sections or / and they can be served by nozzles 11 of different caliber, so as to obtain the best dosage for each operating regime .
the slots 18 and 19 of the shutter 3 have been illustrated as having a uniform width and ending in arcs of a circle, they may have any other profile in order to obtain a desired law of variation of the total section of passage as a function of the accelerator control, this law being approximately linear, exponential or other, to obtain the best maneuverability of the engine.
the rotary shutter 3 is controlled by means of a shaft 20, which passes through the body 1 and the cover 5 and which, above the latter, is connected to a lever 21 returned to the minimum position by a spring 23 supported on a relief 42 of the cover 5.
the lever 21 will be hooked the bowden or other acceleration control transmission, not shown, acting substantially along the line with dots and lines 43 of Figure 1.
a toroidal lining 22 establishes the seal between the small shaft 20 and the body 1.
Operation at minimum speed in a carburetor according to the invention, can be made correct by providing a first diffuser particularly designed for this operation, and in this case no special device should be provided for this purpose.
a special minimum device like the one shown in Figures 1 and 7.
the conduit 10 can be more or less throttled by means of a needle screw 26, and the air passage 9 can also be more or less throttled by means of an adjusting screw 17. Operation at minimum speed can therefore be conveniently adjusted by means of the screws 17 and 26.
the passage 9 can be permanently open, since its cross section is negligible for operation at higher speeds, or else it can be opportunely occluded by the rotary shutter 3, from a speed determined supply.
the recovery pump comprises a piston 28 inserted, without sealing, in a cylinder 8 formed in the body 1, adjacent and in communication, above a wall 44, with the central tank 30 at constant level.
a conduit 45 which, through a non-return valve 29, opens into the first diffuser 6.
the piston 28 is pushed upwards by a spring 46 and it is connected to a rod 47 which forms a pusher against a front cam 48 presented below by the lever 21 for controlling the rotary shutter. So, when the rotator is rotated in the direction of increasing the opening of the diffusers, the rod 47 with the piston 28 is lowered.
the device for the cold start when requested, may simply consist of a flat element 24, pivoted on the shaft 20 and sliding on the cover 5 under the control of a tie rod, not shown, arranged along the line with dots and lines 50 of Figure 1.
the movement of the element 24 is limited, by stops 49 formed by the cover 5, between two positions, in one of which (normal operation) the element 24 n ' not interfere with the diffusers 6, while in the other position (cold start) the element 24 partially closes the first diffuser 6.
the cover 5 is predisposed to receive thereon the body of an air filter. But it is also possible to shape the cover 5 so that it itself forms the seat for the application of a filter cartridge for the aspirated air, thus avoiding providing the carburetor with a special body for the filter. and simplifying assembly operations.
the application of the present invention allows the adoption of forms particularly suitable for manufacture in molded synthetic material, but when requested, the parts of the carburetor according to the invention can be produced with another material, such as zamak (alloy zinc and aluminum) or a light alloy, by die-casting.
zamak alloy zinc and aluminum
a light alloy by die-casting.
the carburetor can be provided with any other kind of tank at constant level, for example with float.
the number of diffusers which in the example is seven, can naturally vary from a minimum of three to a maximum determined by the overall dimensions accepted for the carburetor. Their arrangement, and in particular the augular distance between successive diffusers, can be chosen differently, and it can be uniform or even different for the various diffusers.

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)
Means For Warming Up And Starting Carburetors (AREA)

EP82200759A 1981-07-02 1982-06-18 Vergaser für Brennkraftmaschinen Expired EP0069416B1 (de)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
IT67919/81A IT1144263B (it)	1981-07-02	1981-07-02	Carburatore per motori a combustione interna
IT6791981		1981-07-02

Publications (3)

Publication Number	Publication Date
EP0069416A2 true EP0069416A2 (de)	1983-01-12
EP0069416A3 EP0069416A3 (en)	1984-03-07
EP0069416B1 EP0069416B1 (de)	1986-10-01

Family

ID=11306367

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP82200759A Expired EP0069416B1 (de)	1981-07-02	1982-06-18	Vergaser für Brennkraftmaschinen

Country Status (4)

Country	Link
US (1)	US4465641A (de)
EP (1)	EP0069416B1 (de)
DE (1)	DE3273547D1 (de)
IT (1)	IT1144263B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
IT1224458B (it) *	1988-09-30	1990-10-04	Marco Morini	Spuzzatore corretto per il carburatore di un motore a carburazione

Citations (7)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR437972A (fr) *	1911-12-21	1912-05-04	Pierre Velter	Appareil de carburation rationnelle pour moteurs à explosion à gaz, pétrole ou essence
FR488209A (fr) *	1916-02-23	1918-09-14	Leonard Longley	Perfectionnements apportés aux carburateurs pour moteurs à combustion interne
FR580262A (fr) *	1924-04-17	1924-11-04		Carburateur
FR614169A (fr) *	1926-04-07	1926-12-08		Carburateur
FR647181A (fr) *	1927-06-03	1928-11-21		Carburateur
FR43573E (fr) *	1933-03-30	1934-07-11		Carburateur
FR879212A (fr) *	1942-02-10	1943-02-17		Carburateur multiple pour moteurs à combustion interne

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US900604A (en) *	1904-12-28	1908-10-06	John W Duntley	Carbureter.
US948612A (en) *	1908-04-06	1910-02-08	Krause Carbureter Company	Carbureter for combustion-engines.
US1180976A (en) *	1915-07-07	1916-04-25	John Leslie Cloudsley	Carbureter.
US1205602A (en) *	1916-01-11	1916-11-21	Thomas John Disturnal	Carbureter.
US1485759A (en) *	1916-12-28	1924-03-04	Ball & Ball Carburetor Company	Carburetor
US1586097A (en) *	1919-05-14	1926-05-25	John J Lyons	Carburtor
US1986321A (en) *	1932-04-23	1935-01-01	Chanard Auguste	Carburetor
US2049180A (en) *	1934-03-19	1936-07-28	Surra Stephane	Carburetor for internal combustion engines
US2086292A (en) *	1935-04-02	1937-07-06	Chanard Marthe Louise	Carburetor
US2454974A (en) *	1941-09-23	1948-11-30	Solex	Liquid distributing device
US2638330A (en) *	1949-09-13	1953-05-12	Morgenroth Henri	Carburetor
US2783981A (en) *	1953-10-21	1957-03-05	Briggs Res & Dev Inc	Production of combustible mixture of air and fuel vapor
US2977099A (en) *	1959-05-26	1961-03-28	Chrysler Corp	Floatless carburetor
FR2260694B1 (de) *	1974-02-08	1976-11-26	Motobecane Ateliers
US4139580A (en) *	1977-05-13	1979-02-13	Walbro Corporation	Self-lift carburetor

1981
- 1981-07-02 IT IT67919/81A patent/IT1144263B/it active
1982
- 1982-06-18 EP EP82200759A patent/EP0069416B1/de not_active Expired
- 1982-06-18 DE DE8282200759T patent/DE3273547D1/de not_active Expired
- 1982-06-22 US US06/390,864 patent/US4465641A/en not_active Expired - Fee Related

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR437972A (fr) *	1911-12-21	1912-05-04	Pierre Velter	Appareil de carburation rationnelle pour moteurs à explosion à gaz, pétrole ou essence
FR488209A (fr) *	1916-02-23	1918-09-14	Leonard Longley	Perfectionnements apportés aux carburateurs pour moteurs à combustion interne
FR580262A (fr) *	1924-04-17	1924-11-04		Carburateur
FR614169A (fr) *	1926-04-07	1926-12-08		Carburateur
FR647181A (fr) *	1927-06-03	1928-11-21		Carburateur
FR43573E (fr) *	1933-03-30	1934-07-11		Carburateur
FR879212A (fr) *	1942-02-10	1943-02-17		Carburateur multiple pour moteurs à combustion interne

Also Published As

Publication number	Publication date
IT1144263B (it)	1986-10-29
EP0069416B1 (de)	1986-10-01
US4465641A (en)	1984-08-14
EP0069416A3 (en)	1984-03-07
IT8167919A0 (it)	1981-07-02
DE3273547D1 (en)	1986-11-06

Legal Events

Date	Code	Title	Description
1982-11-12	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1983-01-12	AK	Designated contracting states	Designated state(s): DE FR GB SE
1983-09-21	17P	Request for examination filed	Effective date: 19830702
1984-01-03	PUAL	Search report despatched	Free format text: ORIGINAL CODE: 0009013
1984-03-07	AK	Designated contracting states	Designated state(s): DE FR GB SE
1986-08-15	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
1986-10-01	AK	Designated contracting states	Kind code of ref document: B1 Designated state(s): DE FR GB SE
1986-10-31	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: SE Effective date: 19861031
1986-11-06	REF	Corresponds to:	Ref document number: 3273547 Country of ref document: DE Date of ref document: 19861106
1987-07-30	PLBE	No opposition filed within time limit	Free format text: ORIGINAL CODE: 0009261
1987-07-30	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT
1987-09-16	26N	No opposition filed
1993-06-08	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: GB Payment date: 19930608 Year of fee payment: 12
1993-06-23	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: DE Payment date: 19930623 Year of fee payment: 12
1993-06-29	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: FR Payment date: 19930629 Year of fee payment: 12
1994-06-18	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: GB Effective date: 19940618
1995-02-15	GBPC	Gb: european patent ceased through non-payment of renewal fee	Effective date: 19940618
1995-02-28	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: FR Effective date: 19950228
1995-03-01	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: DE Effective date: 19950301
1995-04-28	REG	Reference to a national code	Ref country code: FR Ref legal event code: ST

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