CA1295196C - Modular side-draft carburetor - Google Patents
Modular side-draft carburetorInfo
- Publication number
- CA1295196C CA1295196C CA000541903A CA541903A CA1295196C CA 1295196 C CA1295196 C CA 1295196C CA 000541903 A CA000541903 A CA 000541903A CA 541903 A CA541903 A CA 541903A CA 1295196 C CA1295196 C CA 1295196C
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- venturi
- passage
- carburetor
- communicating
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Abstract
ABSTRACT OF THE INVENTION
A carburetor comprising a combined float bowl and venturi section including an air passage with a venturi, a rotatably supported throttle valve plate located in the air passage, and a float chamber adapted to contain fuel, and a separate metering section mounted on the float bowl and venturi section, the metering section being molded of plastic and including a fuel passage communicating between the float chamber and the air passage, a needle valve seat within the fuel passage, an internally threaded bore having therein threads molded integrally with the metering section, and an externally threaded needle valve threadedly received in the bore and being movable into and out of engagement with the valve seat for controlling fuel flow through the fuel passage.
A carburetor comprising a combined float bowl and venturi section including an air passage with a venturi, a rotatably supported throttle valve plate located in the air passage, and a float chamber adapted to contain fuel, and a separate metering section mounted on the float bowl and venturi section, the metering section being molded of plastic and including a fuel passage communicating between the float chamber and the air passage, a needle valve seat within the fuel passage, an internally threaded bore having therein threads molded integrally with the metering section, and an externally threaded needle valve threadedly received in the bore and being movable into and out of engagement with the valve seat for controlling fuel flow through the fuel passage.
Description
5~6 "MODULAR SIDE-DRAFT CARBURETOR"
BACKGROUND OF THE INVENTION
The invention relates to carburetors, and, more particularly, to modular side-draEt carburetors for small displacement internal combustion engines.
Conventional carburetors include an internally threaded bore threadedly receiving an externally threaded needle valve. The threads in the bore are typically formed by tapping. This requires an extra manufacturing step and also necessitates cleaning of the bore to remove cuttings.
Conventional carburetors also include a nozzle well formed by an integral portion oF the venturi section or of the ~loat bowl section. The volume o~ the nozzle well cannot be changed without replacing the entire section which includes the nozzle well.
It is known to provicle carburetors with circuitous Euel passages. Such passages are typically Eorrned by a series oE an~led passa~es drilled or cored in the carburetor body.
Attention is directed to the ~ollowing U.S.
patents which disclose carburetors:
~3 Constantinesco 1,568,881 Jan. 5, 1926 Goodyear 2,892,622 June 30, 1959 Nutten 3,275,305 Sept. 27, 1966 Payne 3,281,129 Oct. 25, 1966 Arndt, et al. 3,307,836 March 7, 1967 Tuggle 3,345,045 Oct. 3, 1967 Rock 3,985,837 Oct. 12, 1976 Phelps 4,000,224 Dec. 28, 1976 Rickert 4,003,968 Jan. 18, 1977 Hirosawa 4,205,024 May 27, 1980 Satoh 4,496,497 Jan. 29, 1985 SUMMARY OF THE INVENTION
The invention provides a carburetor comprising a ~loat bowl and venturi assembly including an air passage and a float chamber adapted to contain fuel, and a separate metering section mounted on the ~loat bowl and venturi assembly, the metering section being molded of plastic and including a fuel passage cornmunicating between the float chamber. and the air passage, a needle valve seat within the ~uel passage, an internally threaded bore haviny therein threads rnolded integrally with the metering section, and an externally threaded needle valve threadedly received in the bore and being movable into and out o~ engagement with the valve seat for controlling ~uel flow through the fuel passage.
The invention also provides a carburetor comprising a ~loat bowl and ventùri assembly including an air passage and a float chamber adapted to contain fuel, and flexible passage means ~s~
communicating between the float chamber and the air passage for conducting fuel therebetween.
In one embodiment, the carburetor further comprises a nozzle well communicating with the float chamber, and the flexible passage means communicates with the nozzle well.
In one embodiment, the air passage ~orms a venturi, and the carburetor further comprises a nozzle having a first end communicating with the nozzle well and a second end communicating with the venturi.
The invention also provides a carburetor comprising a float bowl and venturi assembly including an air passage with a venturi and a float chamber adapted to contain Euel, a separate nozzle well section defining a nozzle well communicating with thq float chamber, and a nozzle having a first end communicating with the nozzle well and a second end communicating with the venturi.
2G In one embodiment, the float bowl and venturi assembly includes a separate venturi section including the air passage, and a separate float bowl section at least partially defining the float chamber, and the nozzle well section is trapped between the venturi section and the Eloat bowl section.
In one embodiment, the carburetor further comprises means for locating the nozzle well section relative to the float bowl section.
In one embodiment, the locating means includes a locating rib extending from the 10at bowl section, and the nozzle well section engages the locating rib such that lateral movement of the nozzle well section relative to the Eloat bowl section is substantially prevented.
In one embodiment, the carburetor further comprises means for locating the nozzle well section relative to the venturi section.
In one embodiment, the locating means includes, in the venturi section, a portion having an inner wall defining a recess, and, on the nozzle well section, a projection received in the recess.
The invention also provides a carburetor comprising a venturi section including an air passage having a venturi, a separate float bowl section including a float chamber adapted to contain fuel, means releasably connecting the venturi section and the float bowl section, a separate nozzle well section trapped between the venturi section and the float bowl section incident to connection o~ the venturi section ancl the float bowl sect.ion and defining a nozzle well communicating with the float -4~-chamber, and a separate nozzle having a first end communicating with the nozzle well and a second end communicating with the venturi.
The invention also provides a carburetQr comprising a venturi section including ~n air passage having a venturi, and a throttle valve member located in the air passage, a float bowl section mounted on the venturi section and including a float chamber adapted to contain fuel, a metering section mounted on the venturi section and including a fuel passage communicating with the air passage at a point downstream o~ the throttle valve member, a nozzle well section trapped between the venturi section and the float bowl section and defining a nozzle well communicating with the float chamber, a nozzle having a first end communicating with the nozzle well and a second end communicating with the venturi, and flexible passage means located exteriorly of the noæzle and commun.icating between the nozzle well and the fuel passage.
The invention also provides a carburetor comprising a venturi section including an air passage having a venturi, a float bowl section mounted on the venturi section and including a float chamber adapted -to contain fuel, a metering section mounted on the venturi section and including a fuel passage ~.'' -~B-communicating with the air passage, a nozzle well section trapped between the venturi section and the -float bowl section and deining a nozzle well communicating with the float chamber, a nozzle having a first end communicating with the nozzle well and a second end communicating with the venturi, and flexible passage means communicating between the nozzle well and the -fuel passage.
The invention also provides a carburetor comprising a venturi section including a pair of opposite ends and having an interior induction passage extending between the opposite ends, a first exterior face extending between the opposite ends and located on one side of the induction passage and having a peripherial margin lying in a first plane, which first exterior face has therein a first plurality of bores extending in parallel relation to each other and at a right angle to the first plane, a second exterior face extending between the opposite ends and on the side of the induction passage opposite the one side and having a peripherial margin lying in a second plane parallel to the first plane, which second exterior face has therein a second plurality of bores extending in parallel relation to each other and at a right angle to the second plane, and third and fourth exterior faces respectively ,~
- ~c -extending between the opposite ends and between the first and second exterior faces and respectively extending on opposite sides of the induction passage, and each of the third and fourth exterior faces including therein at least one bore extending generally parallel to the first and second planes, which bores are the only bores in the exterior faces.
The invention also provides a carburetor comprising a venturi section including a pair of opposite ends and having an interior induction passage extending between the opposi-te ends, a first exterior face extending between the opposi~e ends and located on one side of the induction passage and having a first peripheral margin lying in a first plane, which first exterior face has therein a first plurality of bores located within the first peripheral margin and extending in parallel relation to each other and at a right angle to which first plane, which first plurality of bores are the only bores ~n the first exterior face, a second exterior face extending between the opposite ends and on the side of the induction passage opposite the one side and having a second peripheral margin lying in a second plane parallel to the first plane~, which second exterior face has therein a second plurality of bores located within the second peripheral margin and extending in parallel relation to each other and at a right angle to the second plane, which second plurality o bores are the only bores in the second exterior face, and third and fourth exterior faces respectively extending between the opposite ends and between the first and second exterior faces and respectively extending on opposite sides of the induction passage, and each of the third and fourth exterior faces respectivly including therein one or more bores extending generally parallel to the first and second planes and being the only bores in the third and fourth ex-terior faces.
The invention also provides a carburetor comprising a venturi section including a pair of opposite ends and having an interior induction passage extending between the opposite ends/ which venturi section also has a first exterior face extending between the opposite ends and located on one side of the induction passage and having a first peripheral margin lying in a first plane, which first exterior face has therein a first plurality of bores located within the first peripheral margin and extending in parallel relation to each other and at a right angle to the first plane, which first plurality of bores are the only bores in the first exterior ace, which venturi section also has a second exterior face extendiny between the opposite ends and on the side of the induction passage opposite the one side and having a second peripheral margin lying in a second plane parallel to the first plane, which second exterior face has therein a second plurality of bores located within the second peripheral margin and extending in parallel relation to each other and at a righ-t angle to the second plane, which second plurality o-f bores are the only bores in the second exterior face, and which venturi section also has third and fourth exterior faces respectively extending between the opposite ends and between the first and second exterior faces and respectivel~
extending on opposite sides of the induction passage, and each of the third and fourth exterior faces respectivly including therein one or more bores extending generally parallel to the first and second planes and being the only bores in the third and fourth exterior faces.
The invention also provides a carburetor comprising a float bowl and venturi assembly including an air passage and a float chamber adapted to contain fuel, a separate metering section mounted on the float bowl and venturi assembly, which metering section includes a fuel passage communicating with the air passage, and flexible .,~,/, passage m0ans communicating between the float chamber and the fuel passage.
The invention also provides a carburetor comprising a floa~ bowl and venturi assembly including an air passage forming a ventuxi and a float chamber adapted to contain fuel, a separate metering section mounted on the float bowl and venturi assembly, which metering section is molded of plastic and includes a fuel passaye communicating with the air passage, an internally threaded bore communicating with the fuel passage, having therein threads molded integrally with the metering section, and adapted to receive an externally threaded needle valve, and flexible passage means communicating between the float chamber and the fuel passage.
The invention also provides a carburetor comprising a float bowl and venturi assembly including an air passage and a float chamber adapted to contain fuel, and non-metallic flexible passage means extending exteriorly of the air passage and communicating between -the float chamber and the air passage for supplying fuel from the float chamber -to the air passage.
The .invention also provides a carburetor comprising a venturi section including an air passage ~' ~5~
with a venturi, a float bowl section including a float chamber adapted to contain fuel, means releasably connecting the venturi section and the float bowl section, a separate nozzle well section defining a nozzle well communicatin~ with the float chamber, and means on the float bowl section and on the nozzle well section for trapping the nozzle well section between the venturi section and the float bowl section incident to connection thereof and for locating the nozzle well section relative to -the float bowl section.
A principal feature of the invention is the provision of a separate metering section molded of plastic and including an internally threaded bore which receives an externally threaded needle valve and which has threads molded integrally with the metering section. This eliminates the step of tapping the threads.
Another principal feature of the invention is the provision of flexible passage means communicating be-tween the float chamber and the air passage. This permits the fuel passage between the float chamber and the air passage to follow a circuitous route without requiring the formation of angled passages in the body of the carburetor.
Another principal ~eature of the invention is the provision or a separate nozzle well section.
This permits changing the volume of the nozzle well without replacing other components of the carburetor such as the venturi section or float bowl section.
Other principal features of the invention will become apparent to those s~illed in the art upon review of the Eollowing detailed description, claims, and drawings.
DESCRIPTION OF THE DRAWINGS
Fig. 1 is a partial, side elevational view of an internal combustion engine including a carburetor embodying the invention.
Fig. 2 is a vertical cross-sectional view of lS the carburetor.
Fig. 3 is a cross-sectional view taken along line 3 3 in Fig. 2.
Fig. ~ is a top view of the venturi section of the carburetor.
Fig. 5 is a bottom view of the metering section of the carburetor.
Fig. 6 is a side view, partially cut away, of the carburetor.
Fig. 7 is an end view (from the left end in Fig. 1), partially cut away, of the carburetor.
Fig. ?3 is a partial exploded view of the carburetor.
~2~
Fi~. 9 is a cross-sectional view taken along line 9-9 in Fig. 4.
Before one embodiment of the invention is explained in detail, it is to be understood that tne invention is not limited in it,s application to the details of construction and the arrangements of components set ~orth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or beiny carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is or the purpose of description and should not be regarded as limiting.
DESCRIPTION OF THE PREFE_RED EMBODIMENT
An internal cornbustion engine 5 inc1uding a carburetor l0 ennbodying the invention is illustrated in the drawings. As shown in Fig. 1, the engine 5 includes a flywhee1 12, a timing carn 1~l, and an intake manifold 16. The carburetor 10 is mounted on the intake mani~old 16 by suitable means such as bolts 18.
The carburetor l0 is modular and has ~our primary sections: a venturi section 20; a metering section 22; a float bowl section 24; and a nozzle well section 26 (see Fig. 2). These sections provide - ~-a high-speed fuel metering circuit and a low-speed ~uel meter.ing circuit.
The venturi section 20 is preferably made of aluminum and has extending there~hrough (see Fig. 2) an air passage 28 having an axis 30 and an upstream end forming an air inlet 32, a middle portion forming a venturi 34, and a downstream end forming a throttle bore 36. The ven-turi section 20 includes a rotatably supported throttle shaft 38, and a throttle valve plate or member 40 mounted on the throttle shaft 38 within the throttle bore 36. A spring 42 (Figs. 1 and 3) biases the throttle shaft 38 to the position in which the throttle valve plate 40 closes the throttle bore 36.
Means are provided for rotating the throttle shaft 38 so that the throttle valve plate 40 opens the throttle bore 36. While various suitable rotating means can be employed, in the preferred embodiment, such means include~ (see Fig. 1) a l.inkage 44 which rotates the throttle shaft 38 in response to movement of the timing cam 14. The linkage ~L4 includes a ro].ler 46 which engages the timing cam 14 and which is operably connected to a lever arm 4~ fixedly mounted on the end of the throttle sha-ft 38. Such a linkage is disclosed in the U.S. Soder Patent No. 2,906,251.
L9~
Means are also provided for limiting movement of the throttle sha~t 38 under the influence of the spring 42, i.e., for preventing movement of the throttle valve plate 40 to a position completely closing the throttle bore 36. While various suitable limiting means can be employed, in the illustrated construction, such means includes a cracking screw 50 mounted on the venturi section 20 and having an end engagable with the lever arm 48 for limiting movement thereof.
The venturi section 20 has a generally planar lower surface 52 which is generally parallel to the axis 30 of the air passage 28 and which has therein a recess 54 (Fig. 2) defining the upper portion of a float chamber 56. The venturi section 20 also has a generally planar upper surface 58 which extends generally parallel to the lower surface 52.
The upper surface 58 has therein (see Fig. 4) a L-shaped recess or channe:l 60 having one end communicatinq with the 1Oat chamber 56 via a vent passage 62. The upper surface 58 also has therein a recess forming a low-speed or of-idle calibration metering passage 64 which communicates with the throttle bore 36 via a plurality of fuel control/air bleed control metering apertures 66. As shown in Fig. 2, the lo~r-speed metering apertures 66 are preferably located downstream of the venturi 34 and upstream of the throttle valve plate 40.
The venturi section 20 also includes an idle fuel discharge passage 68 communicating between the throttle bore 36 and the upper surface 58. As shown in Fig. 2, the idle Euel discharge passage 68 is preferably located downstream of the throttle valve plate 40. The venturi section 20 also includes (see Figs. 3, 4, 6 and 7) a low-speed delivery tube 70 having an upper end positioned flush with the upper surface 58 and a lower end located in the float chamber 56.
The venturi section 20 further includes (see Fig. 9) a fuel inlet passage 72 having an outer end communicating with a nipple 74 adapted to be connected to a source of fuel, and an inner end cornmunicating with a conventional float inlet valve ~ 76. As is apparent ~rom viewing Fig. 2, opening and closing of the inlet valve 76 is controlled by a conventional float 78 pivotally mounted on the venturi section 20 and located within the Eloat chamber 56. When the float 78 is buoyed upwardly, as shown in Fig. 2, the inlet valve 76 is closed and fuel is prevented from flowing into the float charnber 56. As the fuel level in the Eloat chamber 56 drops, the float 78 moves downwardly and opens the inlet valve 76, thereby permitting fuel to ~low into the float charnber 56.
The metering section 22 is preferably molded of plastic and has a generally planar lower surface ~5~96 80 shown in Fig. 5. As shown in Fig. 1, the metering section 22 is mounted on the venturi section 20 with the lower surface 80 of the metering section 22 separated ~rom the upper surface 58 o the venturi section 20 by a gasket 82. The metering section 22 is secured to the venturi section 20 by suitable means such as bolts 84. The gasket 82 has therein a plurality of apertures ~or permitting the bolts 84 to extend therethrough and ~or permitting fluid communication between the various passages in the venturi section 20 and the various passages in the metering section 22.
The metering section 22 includes (see Fig.
BACKGROUND OF THE INVENTION
The invention relates to carburetors, and, more particularly, to modular side-draEt carburetors for small displacement internal combustion engines.
Conventional carburetors include an internally threaded bore threadedly receiving an externally threaded needle valve. The threads in the bore are typically formed by tapping. This requires an extra manufacturing step and also necessitates cleaning of the bore to remove cuttings.
Conventional carburetors also include a nozzle well formed by an integral portion oF the venturi section or of the ~loat bowl section. The volume o~ the nozzle well cannot be changed without replacing the entire section which includes the nozzle well.
It is known to provicle carburetors with circuitous Euel passages. Such passages are typically Eorrned by a series oE an~led passa~es drilled or cored in the carburetor body.
Attention is directed to the ~ollowing U.S.
patents which disclose carburetors:
~3 Constantinesco 1,568,881 Jan. 5, 1926 Goodyear 2,892,622 June 30, 1959 Nutten 3,275,305 Sept. 27, 1966 Payne 3,281,129 Oct. 25, 1966 Arndt, et al. 3,307,836 March 7, 1967 Tuggle 3,345,045 Oct. 3, 1967 Rock 3,985,837 Oct. 12, 1976 Phelps 4,000,224 Dec. 28, 1976 Rickert 4,003,968 Jan. 18, 1977 Hirosawa 4,205,024 May 27, 1980 Satoh 4,496,497 Jan. 29, 1985 SUMMARY OF THE INVENTION
The invention provides a carburetor comprising a ~loat bowl and venturi assembly including an air passage and a float chamber adapted to contain fuel, and a separate metering section mounted on the ~loat bowl and venturi assembly, the metering section being molded of plastic and including a fuel passage cornmunicating between the float chamber. and the air passage, a needle valve seat within the ~uel passage, an internally threaded bore haviny therein threads rnolded integrally with the metering section, and an externally threaded needle valve threadedly received in the bore and being movable into and out o~ engagement with the valve seat for controlling ~uel flow through the fuel passage.
The invention also provides a carburetor comprising a ~loat bowl and ventùri assembly including an air passage and a float chamber adapted to contain fuel, and flexible passage means ~s~
communicating between the float chamber and the air passage for conducting fuel therebetween.
In one embodiment, the carburetor further comprises a nozzle well communicating with the float chamber, and the flexible passage means communicates with the nozzle well.
In one embodiment, the air passage ~orms a venturi, and the carburetor further comprises a nozzle having a first end communicating with the nozzle well and a second end communicating with the venturi.
The invention also provides a carburetor comprising a float bowl and venturi assembly including an air passage with a venturi and a float chamber adapted to contain Euel, a separate nozzle well section defining a nozzle well communicating with thq float chamber, and a nozzle having a first end communicating with the nozzle well and a second end communicating with the venturi.
2G In one embodiment, the float bowl and venturi assembly includes a separate venturi section including the air passage, and a separate float bowl section at least partially defining the float chamber, and the nozzle well section is trapped between the venturi section and the Eloat bowl section.
In one embodiment, the carburetor further comprises means for locating the nozzle well section relative to the float bowl section.
In one embodiment, the locating means includes a locating rib extending from the 10at bowl section, and the nozzle well section engages the locating rib such that lateral movement of the nozzle well section relative to the Eloat bowl section is substantially prevented.
In one embodiment, the carburetor further comprises means for locating the nozzle well section relative to the venturi section.
In one embodiment, the locating means includes, in the venturi section, a portion having an inner wall defining a recess, and, on the nozzle well section, a projection received in the recess.
The invention also provides a carburetor comprising a venturi section including an air passage having a venturi, a separate float bowl section including a float chamber adapted to contain fuel, means releasably connecting the venturi section and the float bowl section, a separate nozzle well section trapped between the venturi section and the float bowl section incident to connection o~ the venturi section ancl the float bowl sect.ion and defining a nozzle well communicating with the float -4~-chamber, and a separate nozzle having a first end communicating with the nozzle well and a second end communicating with the venturi.
The invention also provides a carburetQr comprising a venturi section including ~n air passage having a venturi, and a throttle valve member located in the air passage, a float bowl section mounted on the venturi section and including a float chamber adapted to contain fuel, a metering section mounted on the venturi section and including a fuel passage communicating with the air passage at a point downstream o~ the throttle valve member, a nozzle well section trapped between the venturi section and the float bowl section and defining a nozzle well communicating with the float chamber, a nozzle having a first end communicating with the nozzle well and a second end communicating with the venturi, and flexible passage means located exteriorly of the noæzle and commun.icating between the nozzle well and the fuel passage.
The invention also provides a carburetor comprising a venturi section including an air passage having a venturi, a float bowl section mounted on the venturi section and including a float chamber adapted -to contain fuel, a metering section mounted on the venturi section and including a fuel passage ~.'' -~B-communicating with the air passage, a nozzle well section trapped between the venturi section and the -float bowl section and deining a nozzle well communicating with the float chamber, a nozzle having a first end communicating with the nozzle well and a second end communicating with the venturi, and flexible passage means communicating between the nozzle well and the -fuel passage.
The invention also provides a carburetor comprising a venturi section including a pair of opposite ends and having an interior induction passage extending between the opposite ends, a first exterior face extending between the opposite ends and located on one side of the induction passage and having a peripherial margin lying in a first plane, which first exterior face has therein a first plurality of bores extending in parallel relation to each other and at a right angle to the first plane, a second exterior face extending between the opposite ends and on the side of the induction passage opposite the one side and having a peripherial margin lying in a second plane parallel to the first plane, which second exterior face has therein a second plurality of bores extending in parallel relation to each other and at a right angle to the second plane, and third and fourth exterior faces respectively ,~
- ~c -extending between the opposite ends and between the first and second exterior faces and respectively extending on opposite sides of the induction passage, and each of the third and fourth exterior faces including therein at least one bore extending generally parallel to the first and second planes, which bores are the only bores in the exterior faces.
The invention also provides a carburetor comprising a venturi section including a pair of opposite ends and having an interior induction passage extending between the opposi-te ends, a first exterior face extending between the opposi~e ends and located on one side of the induction passage and having a first peripheral margin lying in a first plane, which first exterior face has therein a first plurality of bores located within the first peripheral margin and extending in parallel relation to each other and at a right angle to which first plane, which first plurality of bores are the only bores ~n the first exterior face, a second exterior face extending between the opposite ends and on the side of the induction passage opposite the one side and having a second peripheral margin lying in a second plane parallel to the first plane~, which second exterior face has therein a second plurality of bores located within the second peripheral margin and extending in parallel relation to each other and at a right angle to the second plane, which second plurality o bores are the only bores in the second exterior face, and third and fourth exterior faces respectively extending between the opposite ends and between the first and second exterior faces and respectively extending on opposite sides of the induction passage, and each of the third and fourth exterior faces respectivly including therein one or more bores extending generally parallel to the first and second planes and being the only bores in the third and fourth ex-terior faces.
The invention also provides a carburetor comprising a venturi section including a pair of opposite ends and having an interior induction passage extending between the opposite ends/ which venturi section also has a first exterior face extending between the opposite ends and located on one side of the induction passage and having a first peripheral margin lying in a first plane, which first exterior face has therein a first plurality of bores located within the first peripheral margin and extending in parallel relation to each other and at a right angle to the first plane, which first plurality of bores are the only bores in the first exterior ace, which venturi section also has a second exterior face extendiny between the opposite ends and on the side of the induction passage opposite the one side and having a second peripheral margin lying in a second plane parallel to the first plane, which second exterior face has therein a second plurality of bores located within the second peripheral margin and extending in parallel relation to each other and at a righ-t angle to the second plane, which second plurality o-f bores are the only bores in the second exterior face, and which venturi section also has third and fourth exterior faces respectively extending between the opposite ends and between the first and second exterior faces and respectivel~
extending on opposite sides of the induction passage, and each of the third and fourth exterior faces respectivly including therein one or more bores extending generally parallel to the first and second planes and being the only bores in the third and fourth exterior faces.
The invention also provides a carburetor comprising a float bowl and venturi assembly including an air passage and a float chamber adapted to contain fuel, a separate metering section mounted on the float bowl and venturi assembly, which metering section includes a fuel passage communicating with the air passage, and flexible .,~,/, passage m0ans communicating between the float chamber and the fuel passage.
The invention also provides a carburetor comprising a floa~ bowl and venturi assembly including an air passage forming a ventuxi and a float chamber adapted to contain fuel, a separate metering section mounted on the float bowl and venturi assembly, which metering section is molded of plastic and includes a fuel passaye communicating with the air passage, an internally threaded bore communicating with the fuel passage, having therein threads molded integrally with the metering section, and adapted to receive an externally threaded needle valve, and flexible passage means communicating between the float chamber and the fuel passage.
The invention also provides a carburetor comprising a float bowl and venturi assembly including an air passage and a float chamber adapted to contain fuel, and non-metallic flexible passage means extending exteriorly of the air passage and communicating between -the float chamber and the air passage for supplying fuel from the float chamber -to the air passage.
The .invention also provides a carburetor comprising a venturi section including an air passage ~' ~5~
with a venturi, a float bowl section including a float chamber adapted to contain fuel, means releasably connecting the venturi section and the float bowl section, a separate nozzle well section defining a nozzle well communicatin~ with the float chamber, and means on the float bowl section and on the nozzle well section for trapping the nozzle well section between the venturi section and the float bowl section incident to connection thereof and for locating the nozzle well section relative to -the float bowl section.
A principal feature of the invention is the provision of a separate metering section molded of plastic and including an internally threaded bore which receives an externally threaded needle valve and which has threads molded integrally with the metering section. This eliminates the step of tapping the threads.
Another principal feature of the invention is the provision of flexible passage means communicating be-tween the float chamber and the air passage. This permits the fuel passage between the float chamber and the air passage to follow a circuitous route without requiring the formation of angled passages in the body of the carburetor.
Another principal ~eature of the invention is the provision or a separate nozzle well section.
This permits changing the volume of the nozzle well without replacing other components of the carburetor such as the venturi section or float bowl section.
Other principal features of the invention will become apparent to those s~illed in the art upon review of the Eollowing detailed description, claims, and drawings.
DESCRIPTION OF THE DRAWINGS
Fig. 1 is a partial, side elevational view of an internal combustion engine including a carburetor embodying the invention.
Fig. 2 is a vertical cross-sectional view of lS the carburetor.
Fig. 3 is a cross-sectional view taken along line 3 3 in Fig. 2.
Fig. ~ is a top view of the venturi section of the carburetor.
Fig. 5 is a bottom view of the metering section of the carburetor.
Fig. 6 is a side view, partially cut away, of the carburetor.
Fig. 7 is an end view (from the left end in Fig. 1), partially cut away, of the carburetor.
Fig. ?3 is a partial exploded view of the carburetor.
~2~
Fi~. 9 is a cross-sectional view taken along line 9-9 in Fig. 4.
Before one embodiment of the invention is explained in detail, it is to be understood that tne invention is not limited in it,s application to the details of construction and the arrangements of components set ~orth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or beiny carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is or the purpose of description and should not be regarded as limiting.
DESCRIPTION OF THE PREFE_RED EMBODIMENT
An internal cornbustion engine 5 inc1uding a carburetor l0 ennbodying the invention is illustrated in the drawings. As shown in Fig. 1, the engine 5 includes a flywhee1 12, a timing carn 1~l, and an intake manifold 16. The carburetor 10 is mounted on the intake mani~old 16 by suitable means such as bolts 18.
The carburetor l0 is modular and has ~our primary sections: a venturi section 20; a metering section 22; a float bowl section 24; and a nozzle well section 26 (see Fig. 2). These sections provide - ~-a high-speed fuel metering circuit and a low-speed ~uel meter.ing circuit.
The venturi section 20 is preferably made of aluminum and has extending there~hrough (see Fig. 2) an air passage 28 having an axis 30 and an upstream end forming an air inlet 32, a middle portion forming a venturi 34, and a downstream end forming a throttle bore 36. The ven-turi section 20 includes a rotatably supported throttle shaft 38, and a throttle valve plate or member 40 mounted on the throttle shaft 38 within the throttle bore 36. A spring 42 (Figs. 1 and 3) biases the throttle shaft 38 to the position in which the throttle valve plate 40 closes the throttle bore 36.
Means are provided for rotating the throttle shaft 38 so that the throttle valve plate 40 opens the throttle bore 36. While various suitable rotating means can be employed, in the preferred embodiment, such means include~ (see Fig. 1) a l.inkage 44 which rotates the throttle shaft 38 in response to movement of the timing cam 14. The linkage ~L4 includes a ro].ler 46 which engages the timing cam 14 and which is operably connected to a lever arm 4~ fixedly mounted on the end of the throttle sha-ft 38. Such a linkage is disclosed in the U.S. Soder Patent No. 2,906,251.
L9~
Means are also provided for limiting movement of the throttle sha~t 38 under the influence of the spring 42, i.e., for preventing movement of the throttle valve plate 40 to a position completely closing the throttle bore 36. While various suitable limiting means can be employed, in the illustrated construction, such means includes a cracking screw 50 mounted on the venturi section 20 and having an end engagable with the lever arm 48 for limiting movement thereof.
The venturi section 20 has a generally planar lower surface 52 which is generally parallel to the axis 30 of the air passage 28 and which has therein a recess 54 (Fig. 2) defining the upper portion of a float chamber 56. The venturi section 20 also has a generally planar upper surface 58 which extends generally parallel to the lower surface 52.
The upper surface 58 has therein (see Fig. 4) a L-shaped recess or channe:l 60 having one end communicatinq with the 1Oat chamber 56 via a vent passage 62. The upper surface 58 also has therein a recess forming a low-speed or of-idle calibration metering passage 64 which communicates with the throttle bore 36 via a plurality of fuel control/air bleed control metering apertures 66. As shown in Fig. 2, the lo~r-speed metering apertures 66 are preferably located downstream of the venturi 34 and upstream of the throttle valve plate 40.
The venturi section 20 also includes an idle fuel discharge passage 68 communicating between the throttle bore 36 and the upper surface 58. As shown in Fig. 2, the idle Euel discharge passage 68 is preferably located downstream of the throttle valve plate 40. The venturi section 20 also includes (see Figs. 3, 4, 6 and 7) a low-speed delivery tube 70 having an upper end positioned flush with the upper surface 58 and a lower end located in the float chamber 56.
The venturi section 20 further includes (see Fig. 9) a fuel inlet passage 72 having an outer end communicating with a nipple 74 adapted to be connected to a source of fuel, and an inner end cornmunicating with a conventional float inlet valve ~ 76. As is apparent ~rom viewing Fig. 2, opening and closing of the inlet valve 76 is controlled by a conventional float 78 pivotally mounted on the venturi section 20 and located within the Eloat chamber 56. When the float 78 is buoyed upwardly, as shown in Fig. 2, the inlet valve 76 is closed and fuel is prevented from flowing into the float charnber 56. As the fuel level in the Eloat chamber 56 drops, the float 78 moves downwardly and opens the inlet valve 76, thereby permitting fuel to ~low into the float charnber 56.
The metering section 22 is preferably molded of plastic and has a generally planar lower surface ~5~96 80 shown in Fig. 5. As shown in Fig. 1, the metering section 22 is mounted on the venturi section 20 with the lower surface 80 of the metering section 22 separated ~rom the upper surface 58 o the venturi section 20 by a gasket 82. The metering section 22 is secured to the venturi section 20 by suitable means such as bolts 84. The gasket 82 has therein a plurality of apertures ~or permitting the bolts 84 to extend therethrough and ~or permitting fluid communication between the various passages in the venturi section 20 and the various passages in the metering section 22.
The metering section 22 includes (see Fig.
2) a fuel passage 86 having a downstream end communicating with the fuel idle discharge passage 68, and an upstream end communicating, via a channel or groove 88 (see Figs. 3 and 5) in the lower surface 80 of the metering section 22, with the upper end o~
the low-speed deliver~ tube 70. Intermediate its upstream and downstream ends, the ~uel passage 86 communicates with the o~f-idle calibration metering passage 64, as shown in Fig. 2.
As also shown in Fig. 2, the metering section 22 includes a needle valve seat 90 located within the fuel passage 86 between the metering passage 64 and the downstream end of the fuel passage 86. The metering section 22 also includes an internally threaded bore 92 which, in the preferred embodiment, extends axially ~rom the downstream end (the left end in Fi.g. 2) o~ the fuel passage 86, and an externally threaded needle valve 94 which is threadedly received in the bore 92 and which is movable into and out of engagement with the valve seat 90 ~or controlling fuel flow through the fuel passage 86 to the discharge passage 68. In the preferred embodiment, the threads of the bore 92 are molded integrally with the metering section 22 rather than being tapped, as is common in the prior art.
Because the valve seat 90 is located downstream of the off-idle calibration metering passage 64, the needle valve 94 does not affect fuel flow thereto. A
seal 96 prevents fuel leakage through the internally threaded bore 92.
The metering section 22 also includes (see Fig. 5) a passage 98 which communicates between the atmosphere and the end of the channel 60 opposite the float chamber vent passaye h2 for venting the float chamber 56 to the atmosphere. The passage 98 has therein a filter 100.
As shown in Fig. 8, the float bowl section 24 is preferably rnade of plastic and is generally cup-shaped with an upper rim forming a generally planar upper surface 102. As shown in Figs. 1 and 2, the float bowl section 24 is mounted on the venturi section 20 with a gasket 104 separating the upper surface 102 of the float bowl section 24 and the ~25~
lower surface 52 of the venturi section 20. The ~loat bowl section 24 is connected to the venturi section 20 by suitable means such as bolts 106. The combined venturi section 23 and float bowl section 24 form a float bowl and venturi assembly.
Th~ float bowl section 24 includes (see Figs. 2 and 8) a lower wall 108 having an upper surface defining the bottom of the float chamber 56, and the float bowl section 24 and the recess 54 of the venturi section 20 combine to form the float chamber 56. ~he float bowl secti.on 24 also .includes (see Fig. 3) a passage 110 having an inner end communicating with the float chamber 56 and an outer end communicating with a nipple 112. The nipple 112 is adapted to be connected to a manual priming system such as the one disclosed in U.S. DuBois Patent No.
the low-speed deliver~ tube 70. Intermediate its upstream and downstream ends, the ~uel passage 86 communicates with the o~f-idle calibration metering passage 64, as shown in Fig. 2.
As also shown in Fig. 2, the metering section 22 includes a needle valve seat 90 located within the fuel passage 86 between the metering passage 64 and the downstream end of the fuel passage 86. The metering section 22 also includes an internally threaded bore 92 which, in the preferred embodiment, extends axially ~rom the downstream end (the left end in Fi.g. 2) o~ the fuel passage 86, and an externally threaded needle valve 94 which is threadedly received in the bore 92 and which is movable into and out of engagement with the valve seat 90 ~or controlling fuel flow through the fuel passage 86 to the discharge passage 68. In the preferred embodiment, the threads of the bore 92 are molded integrally with the metering section 22 rather than being tapped, as is common in the prior art.
Because the valve seat 90 is located downstream of the off-idle calibration metering passage 64, the needle valve 94 does not affect fuel flow thereto. A
seal 96 prevents fuel leakage through the internally threaded bore 92.
The metering section 22 also includes (see Fig. 5) a passage 98 which communicates between the atmosphere and the end of the channel 60 opposite the float chamber vent passaye h2 for venting the float chamber 56 to the atmosphere. The passage 98 has therein a filter 100.
As shown in Fig. 8, the float bowl section 24 is preferably rnade of plastic and is generally cup-shaped with an upper rim forming a generally planar upper surface 102. As shown in Figs. 1 and 2, the float bowl section 24 is mounted on the venturi section 20 with a gasket 104 separating the upper surface 102 of the float bowl section 24 and the ~25~
lower surface 52 of the venturi section 20. The ~loat bowl section 24 is connected to the venturi section 20 by suitable means such as bolts 106. The combined venturi section 23 and float bowl section 24 form a float bowl and venturi assembly.
Th~ float bowl section 24 includes (see Figs. 2 and 8) a lower wall 108 having an upper surface defining the bottom of the float chamber 56, and the float bowl section 24 and the recess 54 of the venturi section 20 combine to form the float chamber 56. ~he float bowl secti.on 24 also .includes (see Fig. 3) a passage 110 having an inner end communicating with the float chamber 56 and an outer end communicating with a nipple 112. The nipple 112 is adapted to be connected to a manual priming system such as the one disclosed in U.S. DuBois Patent No.
3,948,589.
In the preferred embodiment, the nozzle well section 26 is made of plastic and is trapped between the float bowl section 24 and the venturi section 20. ~s shown in Figs. 7 and 8, a gasket 11~ seals the joint between the upper end of the nozzle well section 26 and the venturi section 20, and a gasket 116 seals the joint between the :Lower end o~ -the nozzle well section 26 and the float howl section 2~.
Means are provided Eor locating the nozzle well section 26 relative to the float bowl section 24. While various suitable locating means can be employed, in the preferred e~bodiment, such means includes (see Fig. 8) an endless locating rib 118 extending upwardly from the lower wall 108 of the float bowl section 24. The lower end of the nozzle well section 26 engages or fits within the locating rib 118 such that lateral movement of the nozzle well section 26 relative to the float bowl section 24 is substantially prevented.
Means are also provided for locating the nozzle well section 26 relative to the venturi section 20. While various suitable locating means can be employed, in the illustrated construction, such means includes, in the venturi section 20, a downwardly extending portion having an inner wall defining a cylindrical recess 120 (Fig~ 2), and, on the upper end of the nozzle well section 26, an upwardly extending annular flange or projection or sleeve 122 ~Fig. 8) received in the recess 120.
Engagement oE the flange 122 with the inner wall of the recess 120 substantially prevents lateral movement of the nozzle well section 26 relative to the venturi section 20.
The nozzle well section 26 defines a nozzle well 124 and includes (see Figs. 3 and 7) a high-speed metering orifice 126 communicating between the float chamber 56 and the nozzle well 124. The nozzle well section 26 has mounted therein (see Fig.
3) a low-speed metering duct or tube 128 which constitutes a metering orifice. The tube 128 has a lower end communicating with the nozzle well 124 and an upper end located in the float chamber 56. The upper end of the tube 128 is adapted, as will be explained, to be connected to the delivery tube 70.
The carburetor 10 further comprises a high-speed nozzle 130 having a lower end communicating with the nozzle well 124 and an upper end communicating with the venturi 34. The nozzle 130 has therein (see Fig. 2) a plurality of air bleed holes 132. Preferably, the noz~le 130 extends through the sleeve 122 and through the cylindrical recess 120. The nozzle well 124 and the recess 120 communicate with the atmosphere via an air passage 134. As shown in Fig. 3, the passage 134 has -therein an air bleed filter 136, and an air bleed control orifice 138.
The carburetor 10 further comprises (see Figs. 3, 6 and 7) flexible passage means communicating between the upper end of the low-speed metering tube 128 and the lower end oE the low-speed delivery tube 70. While various suitable ~lexible passage means can be used, in the illustrated construction, such means includes a flexible, non-metallic plastic -tube 140.
The high-speed metering circuit includes -the high-speed metering orifice 126, the nozzle well 124, ~L2~
the nozzl~ 130, the nozzle air bleed holes 132, and the air passage 134 (including the air bleed control orifice ~38 and the air bleed ~ilter 136).
The low~speed (i.e. idle speed and low speeds above idle) metering circuit includes the nozzle well 124, the low-speed metering tube 128, the ~lexible tube 140, the low-speed delivery tube 70, the channel 88, the ~uel passage 86, the low-speed calibration metering passage 64, the metering apertures 66, and the idle fuel discharge passage 68. At engine idle speed, ~uel flows ~rom the nozzle well 124 to the ~uel passage 86 via the low-speed metering tube 128, the flexible tube 140, the low-speed delivery tube 70, and the channel 88. Air passing through the low-speed calibration metering passage 64 is mixed with the ~uel in the ~uel passage 86 to ~orm an emulsion. The ~uel/air emulsion ~low rate is controlled by the needle valve 94 so that a correct amount of ~uel/air emulsion is discharged through the idle discharge passage 68 into the throttle bore 36. At low engine speeds above idle, additional ~uel is drawn into the thcottle bore 36 via the metering holes 66.
Various Eeatures oE the invention are set ~orth in the ~ollowing claims.
In the preferred embodiment, the nozzle well section 26 is made of plastic and is trapped between the float bowl section 24 and the venturi section 20. ~s shown in Figs. 7 and 8, a gasket 11~ seals the joint between the upper end of the nozzle well section 26 and the venturi section 20, and a gasket 116 seals the joint between the :Lower end o~ -the nozzle well section 26 and the float howl section 2~.
Means are provided Eor locating the nozzle well section 26 relative to the float bowl section 24. While various suitable locating means can be employed, in the preferred e~bodiment, such means includes (see Fig. 8) an endless locating rib 118 extending upwardly from the lower wall 108 of the float bowl section 24. The lower end of the nozzle well section 26 engages or fits within the locating rib 118 such that lateral movement of the nozzle well section 26 relative to the float bowl section 24 is substantially prevented.
Means are also provided for locating the nozzle well section 26 relative to the venturi section 20. While various suitable locating means can be employed, in the illustrated construction, such means includes, in the venturi section 20, a downwardly extending portion having an inner wall defining a cylindrical recess 120 (Fig~ 2), and, on the upper end of the nozzle well section 26, an upwardly extending annular flange or projection or sleeve 122 ~Fig. 8) received in the recess 120.
Engagement oE the flange 122 with the inner wall of the recess 120 substantially prevents lateral movement of the nozzle well section 26 relative to the venturi section 20.
The nozzle well section 26 defines a nozzle well 124 and includes (see Figs. 3 and 7) a high-speed metering orifice 126 communicating between the float chamber 56 and the nozzle well 124. The nozzle well section 26 has mounted therein (see Fig.
3) a low-speed metering duct or tube 128 which constitutes a metering orifice. The tube 128 has a lower end communicating with the nozzle well 124 and an upper end located in the float chamber 56. The upper end of the tube 128 is adapted, as will be explained, to be connected to the delivery tube 70.
The carburetor 10 further comprises a high-speed nozzle 130 having a lower end communicating with the nozzle well 124 and an upper end communicating with the venturi 34. The nozzle 130 has therein (see Fig. 2) a plurality of air bleed holes 132. Preferably, the noz~le 130 extends through the sleeve 122 and through the cylindrical recess 120. The nozzle well 124 and the recess 120 communicate with the atmosphere via an air passage 134. As shown in Fig. 3, the passage 134 has -therein an air bleed filter 136, and an air bleed control orifice 138.
The carburetor 10 further comprises (see Figs. 3, 6 and 7) flexible passage means communicating between the upper end of the low-speed metering tube 128 and the lower end oE the low-speed delivery tube 70. While various suitable ~lexible passage means can be used, in the illustrated construction, such means includes a flexible, non-metallic plastic -tube 140.
The high-speed metering circuit includes -the high-speed metering orifice 126, the nozzle well 124, ~L2~
the nozzl~ 130, the nozzle air bleed holes 132, and the air passage 134 (including the air bleed control orifice ~38 and the air bleed ~ilter 136).
The low~speed (i.e. idle speed and low speeds above idle) metering circuit includes the nozzle well 124, the low-speed metering tube 128, the ~lexible tube 140, the low-speed delivery tube 70, the channel 88, the ~uel passage 86, the low-speed calibration metering passage 64, the metering apertures 66, and the idle fuel discharge passage 68. At engine idle speed, ~uel flows ~rom the nozzle well 124 to the ~uel passage 86 via the low-speed metering tube 128, the flexible tube 140, the low-speed delivery tube 70, and the channel 88. Air passing through the low-speed calibration metering passage 64 is mixed with the ~uel in the ~uel passage 86 to ~orm an emulsion. The ~uel/air emulsion ~low rate is controlled by the needle valve 94 so that a correct amount of ~uel/air emulsion is discharged through the idle discharge passage 68 into the throttle bore 36. At low engine speeds above idle, additional ~uel is drawn into the thcottle bore 36 via the metering holes 66.
Various Eeatures oE the invention are set ~orth in the ~ollowing claims.
Claims (34)
1. A carburetor comprising a float bowl and venturi assembly including an air passage and a float chamber adapted to contain fuel, and a separate metering section mounted on said float bowl and venturi assembly, said metering section being molded of plastic and including an internally threaded bore having therein threads molded integrally with said metering section and adapted to receive an externally threaded needle valve.
2. A carburetor as set forth in Claim 1 wherein said metering section also includes a fuel passage communicating between said float chamber and said air passage, a needle valve seat within said fuel passage, and an externally threaded needle valve threadedly received in said bore and being movable into and out of engagement with said valve seat for controlling fuel flow through said fuel passage.
3. A carburetor as set forth in Claim 1 wherein said carburetor further comprises flexible passage means communicating between said float chamber and said fuel passage.
4. A carburetor as set forth in Claim 3 and further comprising a nozzle well communicating with said float chamber, and wherein said flexible passage means communicates with said nozzle well.
5. A carburetor as set forth in Claim 1 wherein said air passage forms a venturi, and wherein said carburetor further comprises a separate nozzle well section defining a nozzle well communicating with said float chamber, and a nozzle having a first end communicating with said nozzle well and a second end communicating with said venturi.
6. A carburetor as set forth in Claim 5 wherein said carburetor further comprises flexible passage means communicating between said float chamber and said fuel passage.
7. A carburetor as set forth in Claim 5 wherein said flexible passage means communicates with said nozzle well.
8. A carburetor comprising a float bowl and venturi assembly including an air passage and a float chamber adapted to contain fuel, and flexible passage means communicating between said float chamber and said air passage for conducting fuel therebetween.
9. A carburetor as set forth in Claim 8 and further comprising a nozzle well communicating with said float chamber, and wherein said flexible passage means communicates with said nozzle well.
10. A carburetor as set forth in Claim 9 wherein said air passage forms a venturi, and wherein said carburetor further comprises a nozzle having a first end communicating with said nozzle well and a second end communicating with said venturi.
11. A carburetor as set forth in Claim 10 and further comprising a separate nozzle well section defining said nozzle well.
12. A carburetor comprising a forth bowl and venturi assembly including an air passage with a venturi and a float chamber adapted to contain fuel, a separate nozzle well section defining a nozzle well communicating with said float chamber, and a nozzle having a first end communication with said nozzle well and a second end communicating with said venturi.
13. A carburetor as set forth in Claim 12 wherein said float bowl and venturi assembly includes a separate venturi section including said air passage, and a separate float bowl section at least partially defining said float chamber, and wherein said nozzle well section is trapped between said venturi section and said float bowl section.
14. A carburetor as set forth in Claim 13 and further comprising means for locating said nozzle well section relative to said float bowl section.
15. A carburetor as set forth in Claim 14 wherein said locating means includes a locating rib extending from said float bowl section, and wherein said nozzle well section engages said locating rib such that lateral movement of said nozzle well section relative to said float bowl section is substantially prevented.
16. A carburetor as set forth in Claim 13 and further comprising means for locating said nozzle well section relative to said venturi section.
17. A carburetor as set forth in Claim 16 wherein said locating means includes, in said venturi section, a portion having an inner wall defining a recess, and, on said nozzle well section, a projection received in said recess.
18. A carburetor comprising a venturi section including an air passage having upstream and downstream ends and forming a venturi, and a throttle valve member located in said air passage, a separate float bowl section including a float chamber adapted to contain fuel, a separate metering section mounted on said venturi section and molded of plastic, said metering section including a fuel passage having upstream and downstream ends and a needle valve seat intermediate said ends, said downstream end of said fuel passage communicating with said air passage at a point downstream of said throttle valve member, an internally threaded bore having therein threads molded integrally with said metering section, and an externally threaded needle valve threadedly received in said bore and being movable into and out of engagement with said valve seat for controlling fuel flow through said fuel passage, a separate nozzle well section defining a nozzle well communicating with said float chamber, said nozzle well section being trapped between said venturi section and said float bowl section, a nozzle having a first end communicating with said nozzle well and a second end communicating with said venturi, and flexible passage means communicating between said nozzle well and said upstream end of said fuel passage.
19. A carburetor as set forth in Claim 18 and further comprising means for locating said nozzle well section relative to said float bowl section.
20. A carburetor as set forth in Claim 19 wherein said locating means includes a locating rib extending from said float bowl section, and wherein said nozzle well section engages said locating rib such that lateral movement of said nozzle well section relative to said float bowl section is substantially prevented.
21. A carburetor as set forth in Claim 18 and further comprising means for locating said nozzle well section relative to said venturi section.
22. A carburetor as set forth in Claim 21 wherein said locating means includes, in said venturi section, a portion having an inner wall defining a recess, and, on said nozzle well section, a projection received in said recess.
23. A carburetor comprising a venturi section including an air passage having a venturi, a separate float bowl section including a float chamber adapted to contain fuel, means releasably connecting said venturi section and said float bowl section, a separate nozzle well section trapped between said venturi section and said float bowl section incident to connection of said venturi section and said float bowl section and defining a nozzle well communicating with said float chamber, and a separate nozzle having a first end communicating with said nozzle well and a second end communicating with said venturi.
24. A carburetor comprising a venturi section including an air passage having a venturi, and a throttle valve member located in said air passage, a float bowl section mounted on said venturi section and including a float chamber adapted to contain fuel, a metering section mounted on said venturi section and including a fuel passage communicating with said air passage at a point downstream of said throttle valve member, a nozzle well section trapped between said venturi section and said float bowl section and defining a nozzle well communicating with said float chamber, a nozzle having a first end communicating with said nozzle well and a second end communicating with said venturi, and flexible passage means located exteriorly of said nozzle and communicating between said nozzle well and said fuel passage.
25. A carburetor comprising a venturi section including an air passage having a venturi, a float bowl section mounted on said venturi section and including a float chamber adapted to contain fuel, a metering section mounted on said venturi section and including a fuel passage communicating with said air passage, a nozzle well section trapped between said venturi section and said float bowl section and defining a nozzle well communicating with said float chamber, a nozzle having a first end communicating with said nozzle well and a second end communicating with said venturi, and flexible passage means communicating between said nozzle well and said fuel passage.
26. A carburetor comprising a venturi section including a pair of opposite ends and having an interior induction passage extending between said opposite ends, a first exterior face extending between said opposite ends and located on one side of said induction passage and having a peripherial margin lying in a first plane, said first exterior face having therein a first plurality of bores extending in parallel relation to each other and at a right angle to said first plane, a second exterior face extending between said opposite ends and on the side of said induction passage opposite said one side and having a peripherial margin lying in a second plane parallel to said first plane, said second exterior face having therein a second plurality of bores extending in parallel relation to each other and at a right angle to said second plane, and third and fourth exterior faces respectively extending between said opposite ends and between said first and second exterior faces and respectively extending on opposite sides of said induction passage, and each of said third and fourth exterior faces including therein at least one bore extending generally parallel to said first and second planes, said bores being the only bores in said exterior faces.
27. A carburetor comprising a venturi section including a pair of opposite ends and having an interior induction passage extending between said opposite ends, a first exterior face extending between said opposite ends and located on one side of said induction passage and having a first peripheral margin lying in a first plane, said first exterior face having therein a first plurality of bores located within said first peripheral margin and extending in parallel relation to each other and at a right angle to said first plane, said first plurality of bores being the only bores in said first exterior face, a second exterior face extending between said opposite ends and on the side of said induction passage opposite said one side and having a second peripheral margin lying in a second plane parallel to said first plane, said second exterior face having therein a second plurality of bores located within said second peripheral margin and extending in parallel relation to each other and at a right angle to said second plane, said second plurality of bores being the only bores in said second exterior face, and third and fourth exterior faces respectively extending between said opposite ends and between said first and second exterior faces and respectively extending on opposite sides of said induction passage, and each of said third and fourth exterior faces respectivly including therein one or more bores extending generally parallel to said first and second planes and being the only bores in said third and fourth exterior faces.
28. A carburetor comprising a venturi section including a pair of opposite ends and having an interior induction passage extending between said opposite ends, said venturi section also having a first exterior face extending between said opposite ends and located on one side of said induction passage and having a first peripheral margin lying in a first plane, said first exterior face having therein a first plurality of bores located within said first peripheral margin and extending in parallel relation to each other and at a right angle to said first plane, said first plurality of bores being the only bores in said first exterior face, said venturi section also having a second exterior face extending between said opposite ends and on the side of said induction passage opposite said one side and having a second peripheral margin lying in a second plane parallel to said first plane, said second exterior face having therein a second plurality of bores located within said second peripheral margin and extending in parallel relation to each other and at a right angle to said second plane, said second plurality of bores being the only bores in said second exterior face, and said venturi section also having third and fourth exterior faces Claim 28 (Continued)...
respectively extending between said opposite ends and between said first and second exterior faces and respectively extending on opposite sides of said induction passage, and each of said third and fourth exterior faces respectivly including therein one or more bores extending generally parallel to said first and second planes and being the only bores in said third and fourth exterior faces.
respectively extending between said opposite ends and between said first and second exterior faces and respectively extending on opposite sides of said induction passage, and each of said third and fourth exterior faces respectivly including therein one or more bores extending generally parallel to said first and second planes and being the only bores in said third and fourth exterior faces.
29. A carburetor comprising a float bowl and venturi assembly including an air passage and a float chamber adapted to contain fuel, a separate metering section mounted on said float bowl and venturi assembly, said metering section including a fuel passage communicating with said air passage, and flexible passage means communicating between said float chamber and said fuel passage.
30. A carburetor as set forth in Claim 29 wherein said fuel passage includes a needle valve seat, an internally threaded bore, and an externally threaded needle valve threadedly received in said bore and being movable into and out of engagement with said valve seat for controlling fuel flow through said fuel passage.
31. A carburetor comprising a float bowl and venturi assembly including an air passage forming a venturi and a float chamber adapted to contain fuel, a separate metering section mounted on said float bowl and venturi assembly, said metering section being molded of plastic and including a fuel passage communicating with said air passage, an internally threaded bore communicating with said fuel passage, having therein threads molded integrally with said metering section, and adapted to receive an externally threaded needle valve, and flexible passage means communicating between said float chamber and said fuel passage.
32. A carburetor comprising a float bowl and venturi assembly including an air passage and a float chamber adapted to contain fuel, and non-metallic flexible passage means extending exteriorly of said air passage and communicating between said float chamber and said air passage for supplying fuel from said float chamber to said air passage.
33. A carburetor as set forth in Claim 32 and further comprising a nozzle well located in and communicating with said float chamber, and wherein said flexible passage means communicates with said nozzle well.
34. A carburetor comprising a venturi section including an air passage with a venturi, a float bowl section including a float chamber adapted to contain fuel, means releasably connecting said venturi section and said float bowl section, a separate nozzle well section defining a nozzle well communicating with said float chamber, and means on said float bowl section and on said nozzle well section for trapping said nozzle well section between said venturi section and said float bowl section incident to connection thereof and for locating said nozzle well section relative to said float howl section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US88663386A | 1986-07-16 | 1986-07-16 | |
| US886,633 | 1986-07-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1295196C true CA1295196C (en) | 1992-02-04 |
Family
ID=25389426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000541903A Expired - Fee Related CA1295196C (en) | 1986-07-16 | 1987-07-13 | Modular side-draft carburetor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2617476B2 (en) |
| CA (1) | CA1295196C (en) |
-
1987
- 1987-07-13 CA CA000541903A patent/CA1295196C/en not_active Expired - Fee Related
- 1987-07-16 JP JP62178155A patent/JP2617476B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6375343A (en) | 1988-04-05 |
| JP2617476B2 (en) | 1997-06-04 |
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