US2501926A

US2501926A - Accelerating pump

Info

Publication number: US2501926A
Application number: US731216A
Authority: US
Inventors: Beard Bert
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-02-27
Filing date: 1947-02-27
Publication date: 1950-03-28
Anticipated expiration: 1967-03-28

Description

Patented Mar. 28, 1950 PATENT OFFICE ACCELERATING PUMP I Bert Beard, Detroit, Mich., asslgnor to George M. Holley and Earl Holley Application February 27, 1947, Serial No. 731,216

1 Claim.

The object of this invention is to improve the acceleration generally andspecifically the part throttle accelerationi or foif idle" operation of I an automotive carbureto at opening I 6. In addition pure air enters the tube 20, flows through the passage 38 and discharges on the engine side of the throttle i2 through the restricted opening it. As a result of this very little air is taken in around the-lip of the throttle it.

A lever ie is shown above the level of the sectional carburetor and is connected to the throttle shaft 52. The lever it is connected through the link 54 with the S-shaped element 4 which is shown above the plane of the cross-section of the drawing. This element 44 is guided in the body of the carburetor and is connected by a one-way connection to the pump rod 50. The rod 50 slides in a hole in the end of the element 44. A spring 56 surrounds the rod 50 and engages with the piston 42 and with the underside of the upper portion of the element 44. Piston 42 reciprocates in cylinder 30.

A float chamber 24 is connected through the passage 25 past the check valve 28 so that when the piston is moved up into the position shown fuel flows from the float chamber 24 into the pump cylinder 30. Fuel is discharged from the pump cylinder 30 past the check valve 32 into I the passage 34. Passage 34 discharges through the opening 36 into the air passage.

Operation opening 36 and is carried through the opening 40 into the mixture outlet.

When part throttle accelerating occurs the throttle l2 first opens to place the opening IS on the engine side of the throttle and thereafter 2 only opens far enough to admit part of the air that the engine calls for. A considerable suction exists at the orifice 40 even after the throttle 12 has been opened a considerable number of 5 degrees and the fuel for acceleration is properly atomized by engine suction so that a very satisfactory acceleration results.

During normal idle running the air delivered through passages 2@-3d id is pure air, hence, less air is taken in past the lips of the throttle it. By reducing this air flow around the throttle if, as pointed out in my Patent No. 2,263,027, less freezing results in icing weather (moderate temperatures and high humidity), especially when operating at normal idle speed with throttle 52 almost closed. Less air down passage iii means a richer mixture discharges at orifices iii and it. This richer mixture is less liable to freeze than are the mixtures in general use today.

The smaller the opening movement of the throttle if the greater is the atomization of the acceleration fuel supplied by pumps i i-3@ l2.

ft is touch throttle acceleration conditions which have been most difficult to satisfy. The slightest touch of the throttle will lift the small ball check valve 32, which is unloaded and so raises the level in the vertical well 34. This causes fuel to flow out of the opening 36, down passage 38 to the restricted outlet 4t.

What I claim is:

Fuel acceleration means for a downdraft carburetor having a constant level fuel supply chamber, a main fuel nozzle fed therefrom, a mixture chamber into which the nozzle dis- 35 charges, a mixture outlet and butterfly throttle therein, a low speed fuel nozzle connected to the main fuel nozzle and discharging fuel and air into said mixture outlet at a point adjacent to the upstream lip of said throttle when said throt- 0 tle is in its idling position and in its initial running position comprising, a descending air passage of relatively large size in free communication with the atmosphere at its upper end and a restricted lower outlet therefrom discharging a portion of the air required for low speed running into the mixture outlet on the engine side of and remote from said throttle, an accelerating pump operated by said throttle, a cylinder therefor, an inlet to said cylinder from said constant level 50 fuel supply chamber, an outlet passage from said cylinder, an unloaded non-return valve therein. said passage discharging into the unrestricted iii portion'ot said air passage so that fuel is discharged by said pump uninfluenced by engine 'suction as the throttle is opened from its engine .idling position into its running position.

BERT BEARD.

REFERENCES CITED The following references are of record in the tile of this patent:

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