US2603199A - Carburetor deicer - Google Patents

Description

y 1952 J. 'r. w. 'MOSELEY CARBURETOR DEICER Filed Jan. 25, 1950 2 SHEETS-SHEET 1 22 O F IC. 2.

O o I INVENTOR. JAMES T.W. MOS ELEY I 27 BY TOBNEY July 15,- 1952 J. T. w. MOSELEY CARBURETOR DEICER 2 SHEETS-SHEET 2 Filed Jan. 23, 1950 INVENTOR.

ATTORNEY Patented July 15, 1952 CARBURETOR DEICER James T. W. Moseley, Richmond Heights, Mo., assignor to Carter Carburetor Corporation, St. Louis, Mo., a corporation of Delaware Application January 23, 1950, Serial No. 139,988

The invention is especially applicable to V- type engines of a known type in which the intake manifolding rests on the upper side of the cylinder block in the crotch of the V and exhaust passages extend both above and beneath the cylinder block. According to the present invention, a by-pass for hot exhaust gases extends from the portion of the exhaust manifolding which overlies the cylinder block up through the intake riser, thence across "the carburetor flange and returns through the riser to the exhaust passage. This exhaust by-pass has been found to effectively counteract icing tendencies around the carburetor throttle and idling ports.

In the accompanying drawings which trate the invention,

Fig. l is an end view and section showing the engine and portions of the exhaust and intake manifolds and the carburetor;

Fig. 2 is a top view of the engine with the carburetor removed;

Fig. 3 is an enlarged side view of the throttle body portion of the carburetor disassembled;

Fig. 4 is a bottom view of the structure in Fig. 3;

Fig. 5 is an enlarged view of the exhaust gas diverting valve and mounting and operating structure;

Fig. 6 is an enlarged section through the throttle body portion only of the carburetor and taken at 90 to Fig. 1. The carburetor H] is of the dual type including a pair of downdraft mixture conduits H with throttle valves l2 in the outlet portions thereof. An arm 13 attached to the common throttle shaft l4 provides for manual control of the throttle valves. The lower portion of the carburetor which mounts the throttle valves is separately formed, as shown in Figs. 36, inclusive, and is known as the throttle body. This member has an upper flange l5 for attachment to the upper portion of the carburetor and a lower flange I6 which is bolted to the riser portion ll of the intake manifold.

The intake manifold riser portion ll includes a pair of intake passages 18 and ill, one longer than the other as shown, communicating at their lower extremities with ducts 23 and 2|, forming part of the intake manifolding 22 leading to the intake valves (not shown) of the engine. The upper surface 23 of the riser conforms in shape 1 Claim. (01. 123-122) valve for each cylinder.

with the lower surface of carburetor endfiange l6 for accommodating a sealing gasket and for bolting attachment to the carburetor.

The engine block, generally shown at 25, is of the V-type having separate banks of cylinders 26 and 21 forming the legs of the V. Intake manifold 22 is of general H-shape and lies above the engine block in the crotch of the V. A pair of exhaust valves are shown at 30 and 3l controlling exhaust ports each leading to exhaust passages 32 and 33, leading oppositely. In an eight cylinder engine, there will be four cylinders in each bank and an intake and exhaust The intake connections to the cylinder are not shown, in detail. Upwardly leading exhaust passages 33 connect with an exhaust cross passage 34 which extends beneath and abuts intake riser I! to form a hot spot for heating intake mixture. Out-' wardly disposed exhaust passages 32 connect with longitudinal exhaust manifold branches 35. Branches 35 connect with the exhaust ports of the respective banks.

Right hand exhaust branch 35 connects with a cross passage 36 extending beneath the engine block. A spacer 31 between right hand manifold 35 and underlying cross passage 36 pivotally mounts an unbalanced butterfly valve 38 (Fig. 5) on a shaft 39. An unbalanced weight 40 rigid with the valve shaft tends to open the valve as does the force of the exhaust on the unbalanced valve, itself. A bi-metal thermostat coil 4! has one end secured to the valve shaft and the other end anchored to a pin 42 on the spacer and urges the valve closed when the engine temperature is low, while opening the valve when the temperature rises. Left-hand exhaust manifold branch 35 has a connection to tail pipe 5| and thence to atmosphere. Underlying exhaust cross passage 36 also connects with tail pipe 5|.

The arrangement of exhaust manifolding is such that exhaust gases may flow from the right hand cylinder bank both upwardly through exhaust passage 33, thence through overlying cross passage 34 and the hot spot, then through exhaust passage portions 33 and 32 of the left-hand cylinder bank and connection 50 to tail pipe 5|. The exhaust gases from the right hand bank may also flow downwardly through exhaust passage 32 and underlying exhaust cross passage 36, if exhaust diverting valve 38 is open. This valve, however, will be urged towards its closed position at low temperatures so as to divert substantial portions of exhaust gases from the right hand bank of cylinder through the overlying exhaust passage 34 and through the hot spot portion so as to heat the fuel mixture in the intake manifold.

Fig. 6 illustrates the idling fuel passage 53 and idle ports 54 and 55 formed in the throttle body portion of the carburetor adjacent and posterior to the edge of throttle valve I2 when closed. Fuel issuing from the idling ports and also air passing the throttle tends to expand, thus absorbing heat and, under certain conditions, ice may be formed which tends to block both the passage of air around the throttle and the issuance of fuel from the idling ports.

In order to counteract this tendency, an exhaust by-pa-ss is provided, including a passage 51 extending upwardly along riser H from exhaust manifold cross passage 34, thence through a recess 58 formed in the under surface of .carburetor end flange [6 and then returning to exhaust passage 34 through passage 59 in the riser. During operation, significant quantities of hot exhaust gases will be directed through by-pass T, 58, and 59, particularly, when diverter valve 38 is closed. When valve 38 is open, less gases flow through the by-pass. A flow through the passage will result from the positioning of portions 51 and 59 at points substantially spaced along passage 34 so that pressure in passage 51 will be greater than that in passage 59. The exhaust gases in the lay-pass, and especially in recess .58, will heat the wall of the carburetor mixture passage within the throttle body and around the throttle valve and idling ports so as to counteract icing tendencies.

As shown in Fig. 4, two of the carburetor attaching bolts pass through openings 60 in recess 58. Consequently, it will be necessary to effectively seal these bolt holes by the use of gaskets.

Recess 58 may be easily formed in the casting process. Its exact configuration may be varied to obtain the best results. The invention also may be modified in other respects as will occur to those skilled in the art and the exclusive use of all modifications as come within the scope of the appended claim is contemplated.

I claim:

In an internal combustion engine, an intake manifold having a riser with a flange, a carburetor having an end flange abutting and bolted to said manifold flange, there being a hollow channel in said flange and extending thereacross, a fuel passage in the wall of said carburetor near said end surface, an exhaust manifold having a branch passing in proximity to said riser and a second branch leading to atmosphere, an exhaust by-pass leading from said first branch upwardly along said riser, thence along said channel and back to said first branch through said riser, and a valve in said second exhaust branch for directing at least substantial portions of the exhaust gases, respectively, through said second branch to atmosphere or through said first branch and said exhaust by-pass for heating said carburetor and fuel in said fuel passage.

JAMES T. W. MOSELEY.

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

UNITED STATES PATENTS

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