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1-2 NRSEZY 2 3, 3E2 C 2A 11 I 2 United States Patent (19) (11) 4,324,746 Green 45 Apr. 13, 1982 (54) CARBURETOR IMPROVEMENT FOR PART 3,852,383 12/1974 Seaman ........... r 261/69 R THROTTLE VACUUM STAGING 3,899,551 8/1975 Korte ............................... 261/69 R 3,940,459 2/1976 Tipton et al. ......................... 261/51 (75) Inventor: William A. Green, St. Charles, Mo. Primary Examiner-Tim R. Miles (73) Assignee: ACF Industries, Inc., New York, Attorney, Agent, or Firm-J. Joseph Muller N.Y. 57 ABSTRACT (21) Appl. No.: 210,724 A carburetor improvement comprising a step-up spring 22) Filed: Nov. 26, 1980 (S) seat (1) attachable to a metering rod lifter (L). The (51) Int. Cl................................................ F02M 7/20 step-up spring bears against the spring seat rather than (52) U.S. C. .................................... 261/51; 261/69 R against a step-up piston (P). Part throttle adjustment of 58 Field of Search ................................ 261/51, 69 R the step-up piston position on the metering rod lifter does not alter the step-up spring force from that which 56 References Cited the step-up spring is designed to exert when changes in U.S. PATENT DOCUMENTS engine vacuum occur and a throttle shaft (TS) is station 2,195,867 4/1940 Mallory ................................. 261/51 ary. 2,857,145 10/1958 Morris ............................... 261/69 R 3,011,770 12/1961 Stoltman ........................... 261/69 R 2 Claims, 4 Drawing Figures &s s SE4aS 2 1-2 NRSEZY 2 3, 23E C 2a 11 i 2 2 s2 F 2 N U.S. Patent Apr. 13, 1982 Sheet 1 of 2 4,324,746 A6 XN n e PMO.is P. HoHoo P. SK .." NSNNNN 7% M SNNNSNSSN 4,324,746 1 2 Corresponding reference characters indicate corre CARBURETOR IMPROVEMENT FOR PART sponding parts throughout the several views of the THROTTLE VACUUM STAGING drawings. 5 DESCRIPTION OF PREFERRED BACKGROUND OF THE INVENTION EMBODIMENTS This invention relates to multi-barrel carburetors and, more particularly, to a carburetor improvement for Referring to the drawings, a carburetor C for an improving vacuum staging of the carburetor. internal combustion engine (not shown) has a fuel me U.S. Pat. No. 3,940,459 discloses a four-barrel carbu tering rod (also not shown). A throttle shaft TS is rotat 10 able in the conventional manner to open and close retor having a push rod on which is carried a metering throttle valves (not shown). A cam M is carried on the rod carrier arm. A fuel metering rod is attached to each throttle shaft and a cam follower F is pivoted at one end of the arm. The lower end of the pushrod is con end. The undersurface of the follower rests atop the tacted by a cam follower which is raised and lowered in cam. The lower end of a vertically disposed metering response to rotation of a cam carried on a throttle shaft 5 rod lifter L seats against the distal end of cam follower of the carburetor. The upper end of the push rod is F. Carburetor C is a multi-barrel carburetor and has an threaded and a vacuum step-up piston is carried on the air horn section AH and a body section B and lifter L is upper end of the rod. A spring bears against the lower installed in aligned cavities extending through these end of the piston and pushes the piston upward when sections when the carburetor is assembled. A metering engine vacuum decreases. During qualification of car 20 rod carriage (not shown) is attached to the upper end of buretors of this type, the position of the piston on the the lifter. " push rod is adjusted to meet the carburetor fuel flow Carburetor C has two fuel bowls (not shown) and a curve. Because the degree of adjustment between car fuel metering rod depends from each end of the carriage buretors may vary, the tension created on the spring into the respective fuel bowls. A step-up piston P is will vary from one carburetor to another. As a conse 25 mounted on the upper portion of lifter Land the under quence, the vacuum step-up response of one carburetor side of the piston is exposed to engine vacuum. The during part-throttle operations may differ markedly piston is responsive to engine vacuum for moving lifter from that of another similar carburetor. Li and consequently, the fuel metering rods when a - SUMMARY OF THE INVENTION change in engine vacuum occurs while throttle shaft TS 30 is stationary. That is, when the engine is operating at Among the several objects of the present invention steady state conditions, any change in engine vacuum is may be noted the provision of a carburetor improve sensed by step-up piston P which moves in response ment for vacuum staging during part throttle opera thereto. This movement is transmitted to the fuel meter tions; the provision of such an improvement for promot ing rods via the lifter/carriage assembly to vary the ing uniformity of vacuum staging operations for carbu 35 position of the fuel metering rods in their respective fuel retors of the same type; the provision of such an im bowl outlets. As a consequence, the fuel supplied to the provement which does not interfere with existing car bores of the carburetor via the carburetor fuel circuits is buretors staging operation; and the provision of such an changed an amount sufficient to return the engine to its improvement which is readily used with existing carbu steady state condition. : retor components or alternatively may be readily com 40 Referring to FIG. 1, step up piston P has a biasing bined therewith. force exerted thereon by a spring S. The force exerted Briefly, the improvement of the present invention on piston P by spring S balances the vacuum force on comprises seating means attachable to the metering rod the piston. Conventionally, spring S bears against a lifter of a carburetor. A step-up spring bears against this lower surface of the piston. Any movement of step-up spring seating means rather than a step-up piston which 45 piston P in response to a change in engine vacuum is the moves a fuel metering rod during vacuum staging of the result of the degree of change in vacuum and the load carburetor at part throttle operation. As a result, part ing force exerted by spring S. throttle adjustment of the step-up piston position on the During carburetor C manufacture, a vacuum staging metering rod lifter does not alter the step-up spring check is performed to determine the response of the force from that which the step-up spring is designed to 50 step-up piston to a change in vacuum. If the response exert when changes in engine vacuum occur during part does not fall within predetermined tolerances, the posi throttle operation. Other objects and features will be in tion of the step-up piston on lifter L is adjusted by in part apparent and in part pointed out hereinafter. serting an appropriate tool in an adjustment slot AS in BRIEF DESCRIPTION OF THE DRAWINGS the top of the lifter assembly and raising or lowering the 55 piston. This adjustment, however, changes the loading FIG. 1 is a partial elevational view, partly in section, on spring S and, because of factors such as stacking of a carburetor, illustrating a conventional vacuum tolerances, the adjustments between similar carburetors staging arrangement; C will so vary the loading on their springs S that the FIG. 2 is a similar view to that of FIG. 1 illustrating loading may vary from design values. As a result, vac a first embodiment of the improvement of the present 60 uum staging performance of a series of carburetors C invention; may ultimately vary greatly from carburetor to carbu FIG. 3 is a partial sectional view of the vacuum stag retor. ing mechanism of FIG. 2 further illustrating the first Referring to FIGS. 2 and 3, an improvement of the embodiment of the improvement of the present inven present invention is indicated generally 1 and comprises tion; and 65 spring seating means attachable to metering rod lifter L. FIG. 4 is a view similar to FIG.3 illustrating a second Means 1 comprises a sleeve 3 sized to fit over the meter embodiment of the improvement of the present inven ing rod lifter. Sleeve 3 is positioned on lifter L below tion. piston P and is crimped in place or otherwise suitably 4,324,746 3 4. attached to the lifter. The upper end of the sleeve is As various changes could be made in the above con flared or turned outwardly as indicated at 5 to form a structions without departing from the scope of the in bearing surface or circumferential seat for the upper end vention, it is intended that all matter contained in the of spring S. Now, spring S seats against sleeve 3 rather above description and shown in the accompanying than piston P. drawing shall be interpreted as illustrative and not in a As shown in FIG. 3, metering rod lifter L is com limiting sense. prised of an upper section L1 and a lower section L2. What is claimed is: Step-up piston P is secured to section L1 of the lifter 1. In a carburetor for an internal combustion engine, which is threaded at its lower end and is received in a the carburetor having a fuel metering rod, a throttle threaded bore in the upper end of lifter section L2. 10 shaft, a cam carried on the throttle shaft, a cam follower Sleeve 3 is secured to lower section L2 of the lifter.
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