US2352924A - Carburetor - Google Patents

Description

July 4, 1944. w. F.VALLIER 2,352,924

CARBURETOR I Filed y 13, 1942 2 Sheets-Sheet 1 I??? Z I Inventor War/e50 1" 7 3/11 l5?) By W H Attorneys y 9 w. F. VALLIER I 2,352,924

I CARBURETOR Filed May 15, 1942 2 Sheets-Sheet 2 a new .27 VA L L we,

M EMAmi-nqs Patented July 4, 1944 UNITED STATES PATENT OFFICE CARBURETOR v Wilfred F. Vallier, Fort Smith, Ark. 1 Application May-13,1942, Serial No. 442,802 1 Claim. (261-47) The present invention relates to new and'useful improvements in carburetors, particularly for internal combustion engines, and has for its primary' object to provide, me device of this character'of the type comprising a float chamber, novel means for removing the fuel vapors or fumes from said float chamber and mixing them with the ingoing charge, thus promoting fuel their introduction into the charge.

Other objects of the invention are to provide a carburetor for engines which will be comparatively' simple in construction, strong, durable, compact and which cost.

All the'foregoin'g and'still further objects and advantages of the invention will become apparent from 'astudyof the following specification, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure l is a view in side elevation of a carburetor constructed in accordance with the present invention.

Figure 2 is a top plan view thereof.

Figure 3 is a view in vertical longitudinal section through the device, taken substantially on the line 3-3 of Figure 2.

Referring now to the drawings in detail, it will be seen that the embodiment of the invention which has been illustrated comprises a metallic body I which is adapted to be bolted at 2 to the intake manifold of an internal combustion engine. The body I is provided with a removable head 3. At an intermediate point, the body I is provided with a vertical, circular passage 4 which extends through the head 3.

One end portion of the body i is formed to provide a float chamber 5 for the reception of fuel. The level of the fuel in the chamber 5 is controlled by a needle valve 6 which, in turn, is actuated by a float 'I.

The head 3 above the float chamber 5 has be manufactured at lowformed therein an air chamber 8. The chamberstantially bell-shaped air spreader and bafile I0.

The spreader I0 is spaced from the w'alls of the chamber 8. Further, the spreader IE] extends downwardly into the float chamber 5 to a point adjacent to but spaced fromthe'level' of the fuel therein.

Rising from the upper 'portion of the spreader I0 is a threaded neck II which projects through an opening II which is providedtherefor in the top of the head 3. The upper portion of the spreader I0 is formed to provide-a shoulder I2 for abutting engagement with the top of the chamber 8. A securing; cap I3 is threaded on' the neck I I. A screen I4 is provided for the ports 9. The screen I4 encircles the neck II and has its inner marginal portion secured between the cap I3 and the head 3. Asuitable gasket I5 pre-' vents leakage between the neck I and the cap I3.

The passage 4 extends through the head 3 and mounted in the upper portionthe'reof is a liner' It which is secured'in position bya set-screw Mounted in the liner I6 is a spiral'bafiie I8. A vertical tube I9 is supported in the liner It by the spiral baffle l8.

Mounted in the passage 4 at an intermediatepoint is a'fuel jetZi). The jet includes an an-- gular fitting 2| which communicates with the float chamber 5 for receiving fuel therefrom. The fitting 2| has mounted thereon beneath the tube I9 a substantially conical valve 23.

Operable in the passage 4, below the fuel jet 20, is a throttle valve 3| of the butterfly type. The shaft 32 of the throttle valve 3| has fixed thereon an arm 33 the purpose of which will be presently set forth. Any suitable means may be provided for actuating the throttle valve 3|.

On the other end portion of the body I is a vaporizer and mixer 34. The device 34 includes a chamber 35 which communicates with the passage 4, at a point below the throttle valve 3|, through a passage 36. A valve 31 controls the passage 36. The shaft 38 of the valve 31 has fixed thereon an arm 39. A rod 40 connects the arm 39 to the arm 33. Thus, the valves 3| and 31 are connected for operation in unison.

The head 3 is provided with a comparatively small chamber 4| which communicates with the chamber 35. The lower portion of the wall of the chamber 4| is formed to provide a seat 42.

Theadedly mounted for adjustment in the lower in the head 3 is in vertical alignment with the socket 44. The sockets 44 and 45 slidably receive the end portions of a stem 45. Fixed on the stem 45 at an intermediate point is a poppet valve 41 which is engagable with the seat 42 for controlling the communication between the chambers 4| and 35. A coil spring 48 encircles the lower portion of the stem 46 and has one end engaged with the plug 43 and its other end engaged beneath the valve 41 for yieldingiy urging said valve toward closed position on the seat 42. The tension of the coil spring 48 may be regulated as desired by adjusting the threadedly mounted plug 43. A spring latch 49 releasably secures the plug 43 in adjusted position.

The intermediate portion of a substantially C-shaped pipe 50 extends through the cap 13. This pipe 50 has formed therein an opening '5! (see Fig. 3) which communicates with the interior of the cap l3 and the spreader H1. The pipe 58 terminates in inturned end portions 52 which communicate with the chamber 41 on diametrically opposite sides thereof.

It is thought that the operation of the device will be readily apparent from a consideration of the foregoing. Briefly, with the engine running, fuel from the float chamber 5 is drawn in the usual manner into the passage 4 through the jet 20. Air from the atmosphere is also drawn downwardly into the passage 4. The portion of the incoming air which passes through the tube l9 impinges upon the substantially conical valve 23 and. is uniformly spread thereby and mixed with the fuel as it leaves the upper end of the fitting 2| beneath the valve 23. The rest of the incoming air from the atmosphere is caused to whirl rapidly about the jet 2!] by the spiral baflle l8 and in this manner the fuel and air are thoroughly mixed. The valve 3'! opens and closes with the throttle valve 3|. With the valve 3'! in open positionthe engine suction opens the valve 41 against the tension of the coil spring 48 and, through the medium of the pipe 53, the cap l3, the spreader H], et cetera, air is drawn into the chamber 8 through the ports 9, said air passing through the screen M. This air passes down under and then up into the substantially bell-shaped spreader H], picking up the fuel vapors or fumes in the upper portion of the float chamber 5. The fumes and air are drawn through the pipe 50, the chambers 4| and 45 and the passage 36 where they mix with the ingoing charge. As the fumes and air flow past the valve 41 from the chamber M and enter the comparatively large chamber 35, they expand and are further vaporized and mixed.

It is believed that the many advantages of a carburetor constructed in accordance with the present invention will be readily understood, and although a preferred embodiment of the device is as illustrated and described, it is to be understood that changes in the details of construction and in the combination and arrangement of parts may be resorted to which will fall within the scope of the invention as claimed.

What is claimed is: A carburetor of the character described comprising a body having a, main mixture passage therein for communication with an engine manifold and theatmosphere, said body including a removable head, a float chamber for the recepthe head over the ports, a cap threadedly.

mounted on the neck for securing the spreader in position, said cap being engaged with the screen, said cap communicating with the spreader, another chamber in the body, the thirdnamed chamber communicating with the pas-,

sage, a pipe extending through the cap and com municating therewith at an intermediate point, said pipe communicating, at its ends, with the third-named chamber, a valve controlling the passage, a valve controlling the communication of the third-named chamber with said passage, and means connecting the valves for opening and closing the same in unison.

WILFRED F. VALLIER.

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