US2005336A

US2005336A - Engine cooling device

Info

Publication number: US2005336A
Application number: US581851A
Authority: US
Inventors: Walter F Davis
Original assignee: FAIRCHILD AVIAT CORP
Current assignee: FAIRCHILD AVIAT CORP; FAIRCHILD AVIATION Corp
Priority date: 1931-12-18
Filing date: 1931-12-18
Publication date: 1935-06-18
Anticipated expiration: 1952-06-18

Description

June 18, 1935. w, F DAVE, v 2,005,336

I ENGINE COOLING DEVICE I Filed Dec. 18, 1931 ATfoRNEYs Patented June 18, 1935 UNITED STATES PATENT OFFICE- ENGINE COOLING DEVICE N. Y., a corporation of Delaware Application December 18, 1931, Serial No. 581,851

4 Claims.

This invention relates in general to air cooling systems for internal combustion engines and more particularly to the construction of baflies therefor.

It is an object of the invention to provide a simple and efficient baffle to control the passage of air around the engine cylinders for cooling purposes.

It is another object to provide such a baflle which is also easily attachedand detached.

It is a further object to provide such a baflle which will also cooperate, by reason of its design and place of attachment, with the engine cowling and the cylinder cooling fins to provide a Venturi effect and insure accelerated fiow of air and thorough contact thereof with the outer walls of the cylinders.

With the foregoing and other objects in view, the invention consists in the combination of after set forth in the following description and appended claims, certain embodiments thereof being illustrated in the accompanying drawing, in which:

Figure 1 is a view in side elevation of an inverted internal combustion engine showing the cylinders, theircooling fins and bafiles.

Figure 2 is a view in longitudinal cross-section along line 22 of Figure 1 taken through the cylinders, the bafiies and the engine cowling, showing the cowling on the exhaust side and the baflles on the intake side of the cylinders.

Figure 3 is a similar view with the baflles arranged on theexhaust side and the cowling on 35 the intake side of the cylinders. I

) Referring more particularly to the drawing,

the particular engine shown in Figure 1 for purposes of illustration is a six cylinder inverted and in line aeronautical engine, the crankcase being indicated at I, the camshaft housing at 2 and the cylinders extending therebetween. The cylinders are cast separately and arranged in line and are spaced from each other and are provided with suitable cooling fins cast thereon.

45. Figure 1 shows me cooling baiiles, one being placed between each cylinder and the cylinder adjacent.

Referring to Figure 2, a bafile 5 of light metal having a curved back and inwardly curved ends 60 A and B is placed so as to rest upon the lateral cooling fins 3' and 4 of

cylinders

3 and 4 so as to overlap the space therebetween. This baflle is retained in this position by means of ,a hook 6 attached thereto for engagement by a tension 65 spring 1 which engages a hook 8 on a small piece parts and in the details of construction herein-.

9 which may fit between two lateral fins of the

cylinders

3 and 4, the fins tending to keep the piece in position and the tension of the spring tending to keep the baffle in position. The arrangement of the other bafiies is similar 8 throughout the engine.

In the arrangement shown' in Figure 2, the baifies are all arranged on the intake side of the engine, the exhaust pipes being shown at H adjacent the exhaust ports, the intake ports 10 (not shown) being substantially at the opposite side of the cylinder from the exhaust ports and pipes. It will be appreciated that any suitable type of engine cowling, such as that represented at iii, may be employedto properly di- 15 vert the incoming air in the direction indicated by the arrows. In this instance, the cowling is arranged on the exhaust side opposite the bafiles. The incoming air being confined by the cowling is forced against the exhaust side of the cylinder walls and also between the cylinder walls. However, the path of least resistance for the air is to flow in a straight line and therefore it is necessary to provide some induction system for the air in order to insure'a free flow of air between the adjacent cylinder walls. This is accomplished by the baflies which, due to their curved backs and inwardly curved ends, produce an air passageway of such a nature between the baflle resting on the lateral cooling fins and the actual cylinder wall that a Venturi effect is obtained. This Venturi effect in causing an accelerated air fiow has been found to be an efficient air induction system for insuring the air cooling of the adjacent cylinder walls.

The arrangement just described has been found to be so efficient that it may in'practice be found desirable to employ the arrangement shown in Figure 3. In this arrangement bafiles 5 are arranged on the exhaust side of the space 40 between

cylinders

3 and 4 while the cowling i0 is arranged onthe intake or other side of the engine over the space between

cylinders

3 and 4. Obviously the exhaust side of the cylinder is subjected to'the greater degree of heat. However by either of the arrangements shown in Figures 2 and 3, the efficiency of air cooling of the adjacent cylinder walls is obtained. The matter of preference between the two arrangements lies only in the question of cooling the exhaust side of the cylinders.

The same bafiie and Venturi effect may be carried out for the front side of the front cylinder and the rear side of the rear cylinder. A Venturi effect is provided for the passage of air around the front side of the front cylinder and suitable baiiie I2 curved, as indicated in Figures 2 and 3, to a part or the engine, such as the front oil drain pipe H. The rear end of the cowling .l3 may also be curved to produce a Venturi efiect for the air passing around the rear side of the rear cylinder.

I claim:

1. In an internal combustion engine having spaced cylinders provided with lateral cooling fins, an air cooling baflle detachably secured so as to rest upon said fins and to overlap the space between adjacent cylinders, said plate being curved at both ends and capable of producing a Venturi effect on the air passing between the plate and both ofsaid adjacent cylinder walls, resilient detachable retaining means for said plate extending between said cylinders.

2. In an internal combustion engine having spaced cylinders provided with lateral cooling fins, an air cooling bafile detachably secured so as to rest upon said fins and to overlap the space between adjacent cylinders, said plate being curved and capable of producing a Venturi effeet on the air passing between the plate and the side walls of said adjacent cylinders, retaining means for said plate including a clip adapted to rest between the cooling flns on the opposite side of said cylinders and a tension element between said plate and clip.

3. In an internal combustion engine having spaced cylinders each of which is provided with substantially lateral cooling fins, a cowling for said engine arranged on the exhaust side of said cylinders, baflies arranged between the adjacent cylinder walls and resting on said fins, said baffles having their vertical ends curved inwardly and away from said cylinders, so as to provide an air passageway having the characteristics of a venturi to provide a means of accelerating the airflow between said adjacent cylinder walls.

4, In air-cooled engines, a bafiling means bearing on the engine cylinders and extending across the inter-cylinder spaces to direct air to the lee .vard sides of said cylinders, and a member bearing on the opposite sides of said cylinders, and fastened to said baflling means for clamping the complete assembly in position.

WALTER F. DAVIS.