US2000248A - Hooded cylinder head for gas engines - Google Patents

Description

May 7, 1935.

if a Q3 R. S. MOORE HOODED CYLINDER HEAD FOR GAS ENGINES Filed Nov. 50, 1932 2 Sheets-Sheet l May 7, 1935. R. s. MOORE HOODED CYLINDER HEAD FOR GAS ENGINES 2 Sh eets-Sheet 2 Filed Nov. 30, 1952 i I l I Patented May 7, 1935 UNITED STATES PATENT oFFicE noonnn cnmnaa mun roa GAS- enemas Robert S. Moore, Silver Spring, Mdflasslgnor to General Airmotors Company, Scranton, Pa., a corporation of Pennsylvania Application November 30, 1932, Serial No. 645,093 1 Claim. (01. 123-90) The invention relates to new and useful imhaust port forms no part of the present inven provements in gas engines and more particularly tion, but is shown, described and claimed in my for a gas engine having a cylinder head attached copending application 402,703, filed October 26, to the cylinder body and provided with support- 1929. The intake and exhaust valves are con- 5 ing and operating means for the intake and trolled by rockers. The intake valve operating 5 exhaust valves thereon. rocker is indicated at 22. This rocker is in An object of the invention is to provide a the form of a yoke having two arms 23, 23, cylinder head with a protecting hood covering which are connected to the valve stems. There the rockers controlling the intake and exhaust is a third arm 26 which is connected to a rod valves, which protecting hood is formed integral 26 for imparting oscillations to the rocker. The 10 with the cylinder head and provided with fins exhaust valve is controlled by a rocker 26 which which aid in the dissipating of the heat genincludes an arm 2! bearing on the valve stem erated in the cylinder. and an arm 28 connected to a rod 29 by which A further object of the invention is to prooscillations are imparted to the rocker 26.

16 vide a hooded cylinder head of the above type These two rockers 22 and 26 are mounted on wherein said hood has a streamline shape so the same supporting shaft 30 but for independas to insure that the air passing over the same ent rocking movement thereon. This shaft 3|! will contact with the surface of the hood for is carried by a bracket 3|. The bracket 3| is the efficient cooling of the same. provided with projecting trunnions engaging In the drawings: bearing blocks 32, 33, which are secured to 20 Fig. 1 is a sectional view through the upper the cylinder head by a bolt 34. A plate 35 is portion of a cylinder and through a cylinder attached to one of the cylinder head bolts 36 head with the improved integral hood covering and this plate has an upturned lug 31 which and housing the rockers and the intake and lies between yoke arms of the bracket 3|. A

exhaust valves operated thereby. bar 31a attached to the outer end of the bracket 25 Fig. 2 is a plan view of the same. 3| is also attached to the crank casing at its The invention as shown in the drawings is lower end. This forms a rocker assembly which applied to a gas engine which includes a cylinis secured to the cylinder head by a single bolt der I, having a seating end or face 2 provided and to the crank casing and the entire assembly with an exhaust opening 3 and two intake opencan be readily removed from the cylinder head. 30 ings, one of which is indicated at I, in Fig. 1, The present invention has particularly to do and both of which are shown in the plan view with a protecting hood for the valve rockers in Fig. 2. Attached to the cylinder is an alumiand the valve stems, which hood is formed as num alloy head 5. This head has its lower end an integral part of the aluminum alloy poultice machined so as to closely fit the outer face of head. Said hood includes a vertical wall I5. 35 the cylinder head and is often referred to as which extends above the valve stems and the a poultice head. This type of engine is shown, rockers and is provided with a top portion l6. described and claimed in my prior Patent 1,820,- This top portion I6 is preferably made separate 475, granted August 25, 1931, and further defrom the body portion of the hood and is se- 40 scription of the poultice head and the attachcured thereto by bolts, one of which is indi- 40 ing of the same to the cylinder is not thought cated at 6a. The hood extends beyond the necessary. end of the rockers and completely covers and Mounted for movement in the head 5 of the houses said rockers, the valve stems and the ylin i the Stem 5 0f the exhaust V v springs associated therewith. The vertical wall which controls the exhaust port in the end of IS extends all the way around the hood. This 45 the cylinder. Springs 8 surround the stem and vertical wall as clearly shown in Fig. 2, is given normally hold the valve closed. There is a valve a streamline shape. The engine is mounted so 9 for each intake opening carried by a valve that the air currents are in the direction of stem, one of which is indicated at It. The the arrow in Fig. 2, said vertical wall of the valve stems are mounted in the cylinder head hood in the region where the air stream first 50 and associated with each valve stem is a spring impinges on the same, is provided with hori- II which normally holds the-valve closed. The zontally extending fins or ribs There are arrangement of two intake ports with valves a series of these fins and they are preferably simultaneously controlling the same and one of graduated extent, with the longest fin at the exhaust port with a valve controlling said exlower end of the hood. These fins extend from 55 cylinder has horizontally extending fins 2|. The

heat created within the cylinder is rapidly transmitted to the cylinder head and to the hood attached thereto. The hood being integral with the cylinder head greatly aids in the dissipation of the heat. The fins on the hood and cylinder head further aid in the cooling of the cylinder. The hood having a streamline shape will aid throughout its entire extent in the dissipation of the heat. The hood also serves as a means for covering the valve rockers, valve stems and associated springs so as to protect the same from dust. The hood overhangs the side of the cylinder and provides a space through which access may be readily had to the rocker assembly. The operating devices for the rocker assembly and the supporting bar for the bracket extend downward through the opening in the underiace of the overhanging portion of the hood.

It is obvious that minor changes in the construction of the integral hood and the shaping in lines parallel with each other, a rocker mounted on the cylinder head for operating said intake valves, a rocker mountedon said cylinder head for operating said exhaust valve, 9. single hood formed integral with the cylinder head and covering and housing said rockers, said hood having a vertical wall extending from the cylinder head above the rockers and covering and enclosing said rockers, said vertical wall having integral fins projecting therefrom tor dissipating the heat generated in the cylinder, said hood having a streamline shape and symmetrically ROBERT S. MOORE.

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