Gas and liquid contact apparatus – Fluid distribution – Valved
Patent
1980-04-18
1983-09-13
Miles, Tim R.
Gas and liquid contact apparatus
Fluid distribution
Valved
261 44F, F02M 906
Patent
active
044041519
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
This invention relates to down-draft carburetors.
U.S. Pat. No. 3,897,765 discloses a down-draft carburetor of the variable venturi type which comprises a downwardly extending induction passage, a throttle valve mounted in the induction passage, a float chamber, a main jet for conduction fuel from the float chamber into the induction passage, a movable member mounted for transverse movement out of a recess in one side of the induction passage towards the main jet, the movable member cooperating with the main jet and the adjacent walls of the induction passage to define a venturi of variable cross-sectional area in the induction passage upstream from the throttle valve, a metering needle carried by the movable member engaging with the main jet to control the flow of fuel therethrough, and a vacuum motor for moving the movable member.
Hitherto, housings for such carburetors have been formed from a number of individual components, all of which require separate machining or casting, and separate assembly operations prior to the final assembly of the carburetor. The effective functioning of a carburetor depends very closely upon the accuracy with which the moving parts and flow passages within the carburetor cooperate with each other. For example, a minor misalignment of the movable member relative to the induction passage may restrict or hinder its movement and therefore prevent effective operation of the carburetor. The components of the carburetor must therefore be manufactured to fine tolerances to ensure effective and consistent performance of the carburetor. Where two cooperating parts of the carburetor are manufactured in separate sub-assemblies, the two sub-assemblies must be machined to even finer tolerances so that the variations in size and alignments occuring during separate manufacture and assembly of the two sub-assemblies are not so great as to produce an unacceptably large variation in size between the two cooperating parts of the carburetor when the sub-assemblies are assembled together. The construction of a carburetor from a number of separate sub-assemblies therefore necessitates careful manufacturing and assembly techniques all of which increase the cost of production of the carburetor.
Moreover, in the known carburetors of this type, access to the interior of the carburetor usually involves removal of one or more of the sub-assemblies. Consequently, the adjustment of the carburetor can be inadvertently disturbed even during a routine visual examination of the interior of the carburetor.
In accordance with this invention, we provide a down-draft carburetor of the variable venturi type in which the main jet, the throttle valve and the movable member are all mounted wholly within the confines of a unitary casting which defines the induction passage and upwardly open passages constituting the float chamber and the recess, and in which the unitary casting is covered by a single plate which closes the said upwardly open cavities and defines an inlet orifice to the induction passage.
By providing a single casting which completely houses the main jet, throttle valve and movable member, all the machining operations necessary for the mounting of these parts in the carburetor are effected on a single part. Moreover, since the cover plate serves simply as a closure for the cavities in the cover casting, variations in the size of the cover plate due to manufacturing tolerances have little or no effect on the operation of the parts housed in the casting. The carburetor can therefore be manufactured with accuracy and reproducible performances more easily than the known carburetors of the same type.
In addition, access to the interior of the carburetor is achieved simply by removing the single closure plate. Servicing or repair of the carburetor is therefore simplified, since removal of the closure plate does not necessitate adjustment of any of the moving parts of the carburetor and cannot, in itself, disturb the adjustment of the carburetor.
In order to facilitate servicing of the carbureto
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Inkpen Terence
Newbury Frank T.
Ford Motor Company
McCollum Robert E.
Miles Tim R.
Sadler Clifford L.
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