US2603444A - Valve assembly - Google Patents

Description

y 15, 1952 J. F. ARMSTRONG EI'AL 2,603,444

VALVE ASSEMBLY Filed May 28, 1948 I LJI l I FlG.l.

28 INVEN TOR.

JAMES FRED ARMSTRONG FRED A. KOMMER FIG.2. W/R a ATTORNEY Patented July 15, 1952 --.Iames Fred Armstrong, Detroit, Mich and Fred 7' carburetorifionporation, St. Louis, Min-, ac'orpuration of'Delaware Application May 28, 1948, Serial No. 29,828

1 Claim. 1

This invention relates to valve assemblies and consists particularly in a novel sound-proof mounting for a rotatable disk or butterfly type of valve, especially for an automotive carburetor.

This type of carburetor ordinarily has a pair of butterfly valves, one controlling the air inlet and the other the fuel mixture outlet. The choke valve, particularly in an automatic choke type of carburetor, must move freely, and the necessary running clearance between the valve and the wall of the air inlet, has in some cases, resulted in the edge of the valve playing back A and forth and contacting the wall. Where the engine is provided with resilient mountings, the vibration set up may produce a very objectionable hum at this point.

According to the present invention, this disadvantage is overcome by providing ample clearance at the side edges of the disk valve and maintaining the valve centered by means of sound-proof or non-metallic washers lodged between collars on the shaft and outwardly facing abutment surfaces on the outer portion of the air inlet wall.

Accordingly, the main object of the present invention is to provide a free operating valve assembly in which the valve is maintained centered so as to avoid tapping or humming sounds when the assembly is subjected to vibration.

This object and other more detailed objects hereafter appearing are attained by the device illustrated in the accompanying drawing in which Fig. 1 is a side view and section of an automotive carburetor embodying the invention.

Fig. 2 shows an enlarged detail of the structure in Fig. 1.

The carburetor shown is of the dual downdraft type including a pair of mixture conduits 5 having a common air inlet horn portion 6 and outlet portions 1 flanged as at 8 for bolting to the usual engine intake manifold (not shown). Fuel is supplied from a constant level chamber 9 through main nozzles, one being shown at I!) discharging into primary venturi ll. Fuel may also be supplied through the usual idling port l2 adjacent the edge of the throttle valve when closed, and an accelerating pump system (not shown).

The entry of air to the air horn is controlled by a disk or butterfly type of choke valve l5 mounted by means of screws IS on a shaft H which is journalled in bearings [8 formed transversely in the wall of the air horn portion. The

discharge of mixture from the barrels is controlled by a pair of disk throttle valves l9, only one being shown, mounted on a shaft 20 which projects laterally from the right hand side of the carburetor where it mounts a lever 2| for manual operation.

Choke shaft H, at its left end, projects into a housing 23 which encloses automatic choke control mechanism, including a thermostat and other parts (not shown). In order to insure free rotation of shaft l1 within its bearings, the side edges of disk l5 are relieved, as shown at 24, so as to clear the inner wall of the air inlet horn when the valve hangs open.

In order to maintain the valve centered and prevent contact between the valve and air horn, a pair of non-metallic, sound-proof washers 25 and 26 are received on the choke shaft. Washer 25 is lodged between a crank arm 21 rigid on the shaft and an opposing outwardly facing surface on the air horn structure, in this case, within housing 23. Washer 26 is similarly lodged between crank arm 28 on the right hand end of shaft l1 and an outwardly facing surface on the bearing forming portion of the air horn. Cranks 21 and 28 each forms, in effect, an annular shoulder or collar on the choke shaft. Washers 25 and 28 form a free running fit between these shoulders and the air horn, while maintaining the valve substantially centered and preventing contact between the valve and air horn inner wall due to end play in the journal bearings.

The shaft journals are relieved as at 30 and 3| to further ease the rotation of the valve and thus insure its control solely by the air pressure applied thereto and the mechanism within housing 23.

The exact positioning and shape of washers 25 and 26 are not essential.

The exclusive use of all modifications as come within the scope of the appended claim is contemplated.

We claim:

A valve assembly comprising a conduit having elongated, transverse, aligned apertures forming bearings, a shaft rotatably received in said bearings, the shaft within each of the bearings being reduced in diameter to form spaced annushaft and having a free running fit between said shoulders and the conduit wall, and an unbalanced valve disc carried on the shaft within the conduit variably restricting the same under the influence of air pressure, said valve disc having flattened areas at opposite edges, said flattened areasbeing slightly spaced from .the inner wall of the conduit adjacent said apertures, and said valve disc being so centered by said washers as to permit free rotation without metalto-metal contact of the parts except at the hearing areas. 7

JAMES FRED ARMSTRONG. FRED A. KOMMER. l

Number Name Date 1,296,922 Clairmont Mar. 11, 1919 a 2,059,656 7 Ring Nov. 2, 1936 2,134,844 Schartow Nov. 1, 1938 2,282,825 Puffer May 12, 1942 2,285,829 Maage June 9, 1942 FOREIGN PATENTS i Number 1 Country Date 38,648 Netherlands -t of 1935 207,290 Switzerland of 1934 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

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