US1582953A - Pump for suction feed systems - Google Patents

Description

May 4 1926. 1,582,953

L. H. WHEELER PUMP FOR SUCTION FEED SYSTEMS Filed August 24 1922 2 Sheets-Sheet 1 'May 4 1926. 1,582,953

L. H. WHEELER PUMP FOR SUCTION FEED SYSTEMS Filed August 24, 1922 2 Sheets-Sheet 2 laonarczlfian 6mm Ze W6.

Patented May 4, 1926.

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LEONARD I-I. \VHEELER, OF CHICAGO, ILLINOIS, ASSIGNOR TO STEWART-W'ARNER SPEEDOMETER CORPORATION, OF CHICAGO, .ILLIPNOIS, .A' CORPORATION QF VIR- GINIA.

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Application filed August 24, 1922. Serial No. 583,951.

To all whom it may concern:

Be it known that I, LEONARD H. VVHEELER, a citizen of the United States, residing in the city of Chicago, in the county of Cook and State of Illinois, have invented certain-new and useful Improvements in Pumps for Suetion Feed Systems, of which the following is a specification, reference being'had to'the accompanying drawings, forming a part thereof. 7 I

This invention relates to vacuum fuel feed systems for internal combustion engines and its purpose is to provide a suction pump adapted for direct mechanical connection with a moving part of the engine so as to be actuated thereby. It consists of certain features and elements of construction hereinafter described and shown in the drawings as indicated by the claims.

In the drawings:

Figure 1 is a diagrammatic side elevation of an engine and fuel feed system including a pump embodying this invention.

Figure 2 is a side elevation of the pump actuating 'means and a' vertical sectional view of the pump itself.

Figure 3 is a transverse section taken as indicated at line 33 on Figure 2.

Figure t is a transversesection taken as indicated atline l l on Figure 2.

Figure 5 is a top plan view of the pump shown in Figure 2, the valve rods which actuate it appearing in section;

Figure 6 is a sideelevation of actuating means combined with a vertical sectional view of a modified form of pumping device.

Figure 7 is a transverse section-taken as indicated at line 77 on Figure 6.

Figure 8 is a transverse section taken as indicated at line 88 on Figure 6;

Figure 1 illustrates conventionally an internal combustion engine, 1, provided with a carburetor, 2, which is' fed through a pipe, 3, leading from the vacuum tank, 4', which may be of the USUZLlWll understood construction. Said vacuum tank is designed to elevate liquid fuel from, the main supply tank, 5, through a pipe, 6, andis operated by suctionacting through a suction pipe, 7, connected into the top of the tank'f l. A common arrangement is to tap the suction pipe, 7, into the intake manifold, 8, and rely upon the suction of the intake manifold for actuating the feed mechanism in the tank, The present invention provides a meehaut cally driven pump, 9, arranged to be actuated by the motion of two adjacent reciprocating valve rods, 10 and 11, of the engine, 1; Preferably the pump, 9, is positioned withinthe space in which the valve rods, lQand 11, are enclosed behind a removable cover plate, a 12, so that it shall be kept lubricated by the spray or vapor of oil which is usually present in this space.

' As shown in'Figure 2 the pump consists of a cylinder casting,- 9, having an inlet passage, 13, and an exhaust passage, 14, controlled respectively by valves, 15 and 16. The motion of the valve, 16, is checked bya threaded plug, 17, perforated at 18 for discharge of air from thepurnp. The valve, 15, maybe limited as to its play inthe fitting, 19,by means of the cross pin, 20, therein and said fitting is threaded at 21, for connection' to the suction pipe, 7,'as by means of an elbow, 22. j

Within the cylindrical bore of the casting, 9, a pi'ston,'23, is mounted forreciprocation and-its surface is formed with a pluralityof grooves, 2 1, to'receive and distribute oil for keeping the piston well lubricated, and also sealed substantially air tight. Outside the cylinder, 9, the endof thepiston is bifurcated at 25 and journals a plu 26, whose itransverse bore ifits snugly .but slidably upon the rounded end, .27, of a rocker-arm, 28, fulcrumed to swing through a limited arc about the axis ofarock shaft,

29, upon whose squared portion, 30, the arm,

28, is fastened by means of a nut, 31. The rock shaft, 29, is journaled in a bearing lug, 32, upstanding from the base .of a bracket, 33, whose downwardly offset end, 3 1, is secured to a ledge, 35, .of the engine frame or block by a screw or bolt, 36.

The rocker arm, 28, extends upwardly from the shaft, 29, atone side of the bearing lug, 32, and at the other side there is rigidly secured to the shaft a walking beam, 37, whose opposite ends engage the downwardly extending lugs, 38, of notched fittings, 39, which are secured over the valve tappets, 10, by beingclamped under the adjusting nuts, 4 1, of the valve rods. Preferably each ofrthe fittings, 39, is counterbored at 4210 fit over the tappet, 40, and its open notch, 43, embraces the lower end of the valve red, as indicated in Figure 5. The location of th'e pumping" device is so chosen that the valve rods, 16 and 11, with which it is associated are those whose upward movements alternate with each other thus rocking the walking beam, 37, and the rocker arm, 28, for reciprocating the piston, 23, in its cylinder. The cylinder is rigidly supported upon a post, 14, reduced and threaded at its lower end to receive a nut, 15, which clamps it firmly to the base of the barcket, 33, and reduced and threaded at its upper end to engage a threaded hole, 46, in the cylinder casting, 9, in which it is finally locked by a cross pin or rivet, 47.

It will be understood that this extremely simple mechanism will operate automatically whenever the engine is running and without adding any considerable load to the valve tappets, 40, will produce suction through the pipe, 7, which will be more than adequate at all times for operating the vac uum feed apparatus. As is well understood, the vacuum tank, 4, includes internal mechanism, not shown, for venting its suction chamber to the atmosphere to permit discharge of its accumulated contents to the carburetor, 2, through the pipe 3, and during the discharge intervals the pump, 9, will simply run idle.

Figures 6, 7 and 8 show a slightlymodified form of pump in which the piston, 50, is sealed by means of a piston ring or packing, 51, and reciprocates in a cylinder, 52, which is closed at both ends, the piston rod, 53, emerging through a central opening in one cylinder head, 54, for operative connection with the rocker arm, Said rocker arm is actuated by the valve tappets, 40, provided with fittings, 39, having lugs, 38, similar to those already described, and engaging the ends of a walking beam, 37, on the rock shaft, 56, which differs from the rock shaft, 29, only in certain dimensions. Said shaft is journaled in a bearing, 57, mounted on the bracket, 58, which also supports the pump cylinder cast-ing, 59, through the medium of a U- shaped bracket, 60.

The piston rod, 53, is provided at its outer end with flanges, 61 and 62, the latter being secured by means of a cross pin, 63, through its hub, 64;; the rocker arm, 55, is bifurcated at its upper end and carries anti-friction rollers, 65, which engage between the flanges, 61. and 62, at opposite sides of the rod, 53, for transmitting motion from the arm, 55, to the piston rod and its piston, 50. At the upper side of the cylinder, 52, discharge ports, 66, are positioned adjacent each end of the cylinder and are controlled by ball check valves, 67, caged in the counterbores of the ports, 66, by screw plugs, 68, which are perforated at 69 for discharge of air. At the lower side of the cylinder casing inlet ports, 70, are formed at each end and register with valve chambers, 71, in an applied fitting, 72, which contains suction or inlet passages, 73, controlled by ball check valves, 74-. Said fitting 72, includes a nipple, 75,

for attachment of any suitable coupling to connect the suction pipe, 7, which leads from the vacuum tank, 4-. As shown in Figure 8, the fitting, 72, is formed with ears or flanges, 76, to receive attaching screws, 77, by which it is clamped to the valve under surface of the cylinder casting preferably with a sheet of impressible packing material, 78, interposed as shown.

The modified form of pump is thus adapted to withdraw air or vapor from the vacuum tank, 4, upon reciprocation of its piston, 50, in either direction and this double acting form of pump may be found more suitable than the single acting form of Figure 2 when the available stroke provided by the motion of the valve tappets, 40, is quite short.

I claim 1-- 1. In combination with an internal combustion engine a fuel feeding device consisting of a vacuum producing pump of the reciprocating piston type, the same being mounted upon the engine fixed structure and comprising for actuating the pump piston a rocker fulcrumed at its lower end and having its upper end operatively connected with the pump piston; opposite lever arms extend ing from the lower end of the rocker transversely to its fulcrum axis into the vicinity of two oppositely reciprocating valve rods respectively; and tappets mounted on the valve rods for encounter with the opposite ends of the lever arms respectively.

2. In combination with an internal combustion engine a fuel feeding device consisting of a vacuum producing pump of the re ciprocating piston type, the same being mounted upon the engine fixed structure and comprising for actuating the pump piston a rocker fulcrumed at its lower end and having its upper end operatively connected with the pump piston; opposite lever arms extending from the lower end of the rocker transversely to its fulcrum axis into the vicinity of two oppositely reciprocating valve rods respectively; and tappets mounted on the valve rods for encounter with the opposite ends of the lever arms respectively, the tappets being formed with forked stems for entering astride the valve rods respectively between a shoulder and a nut thereon.

In testimony whereof, I have hereunto set my hand at Chicago, Illinois, this 19th day of August, 1922.

LEONARD H. -WIIEELER.

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