US2241498A - Method of manufacturing oil shields for internal combustion engines - Google Patents

Description

May 13, 1941. E. L. WYLlE METHOD OF MANUFACTURING OIL SHIELDS FOR INTERNAL COMBUSTION ENGINES Filed Nov. 25, 1940 INVENTOR. ERNEST L. WYL/E Patented May 13, 1941 METHOD OF MANUFACTURING OIL SHIELDS FOR INTERN AL CONlBUSTION ENGINES Ernest L. Wylie, St. Louis, Mo., assignor to Champ- Items Inc., St. Louis, Mo., a, corporation of Missouri Application November 25, 1940, Serial No. 366,962

4 Claims.

My invention relates to that class of devices which is described in my copending application Serial No. 276,946 of which this is a continuation in part.

In the construction of over head valve engines it is customary to provide for. the rocker arms to impinge the end of the valve stems either inlet or exhaust. This necessitates the provision of some means of lubricating the point of contact to prevent rapid wearing of the meeting parts. This is generally done by means of forced feed lubrication. The oil being permitted, after it leaves the port provided for that purpose, to flow or run down the rocker arm to the valve stems. It is true that this operates to lubricate the working parts very satisfactorily but it is subject to a very serious objection, for the reason thatthere is always an excess amount of lubricating oil flowing down the rocker arms, with the result that it runs down the valve stems and into the engine. This excess oil on themlet side finds its way into the cylinder and is burned up. On the exhaust side it is carried into the exhaust manifold where it is brought in contact with the hot products of combustion and is burned, thence it passes through the discharge pipe from the muffler emerging in the blue vapor so frequently seen on cars using this type of valve. Cars so equipped use an excess amount of lubricating oil.

As described in the said application I have provided a construction which practice has shown effects a considerable saving of oil and also reduces the wear of the valve stems materially.

The principal object of the present application is to provide an improved method of making shields of this type.

A further object is to provide a two piece construction instead of making the shield and hub integral by relative deformation of the parts. It should be pointed out that by relative deformation is intended any such modification of the original size or shape of either ele- Fig. 1 is a fragmentary view of an internal combustion engine showing a portion of the Valve seat, the valve being shown in seated position engaging said valve seat. The valve spring and retainer also are shown, as well as the rocker arm. My improved oil shield is shown in place being fitted to the end of the valve stem where its enlarged surface will be impinged by the rocker arm;

Fig. 2 is a vertical view of an oil shield con structed by my improved method;

Fig. 3 is a side elevation of the hub before it is in place;

Fig. 4 is an elevation of a flange prepared to carry out my improved method of manufacture;

Fig. 5 is an assembled view before the punch press operation;

Fig. 6 is an assembled view after the punch press operation; and

Fig. 7 is a vertical sectional view similar to Fig. 5 of said application Serial No. 276,946, wherein the relative deformation of the parts is accomplished by providing a driving fit. Similar reference numerals refer to similar parts throughout the entire specification.

As shown in the drawing a poppet valve slidably mounted in its guide 2 and closes the valve port formed in the head of the cylinder block of an internal combustion engine. The valve is actuated by a rocker arm 3 which is pivotally mounted upon a valve rocker shaft 4. One end 5 of the rocker arm 3 will at predetermined intervals impinge an enlarged surface 6 formed by the head 8 on the hub 9 of my oil shield 1. This is caused by any well known cam and push rod arrangement which, since they form no part of my invention I shall not describe. A central recess or socket 1' is formed in the hub. This socket fits the end of the valve stem freely but nicely. The enlarged surface 6 is provided to prevent excessive wear. The striking of the end 5 of the rocker arm 3 on the enlarged surface 6 will operate to open the valve against the force of the spring l0, which is of the usual or standard construction. A suitable flanged washer II is fixedly secured to the valve stem and acts as a stop or retainer for the valve spring l0.

As illustrated I form my oil shield l in two parts a hub 9 and an annular flange l2. My method of constructing the shield is as follows:

I cast or form the hub 9 shown in Fig. 3 preferably with a downwardly extending portion I 3 which tapers inwardly. A circumferential groove I 4 is formed in proximity to the head 8.

and flange securely together.

The flange I2 is then stamped or pressed as shown in Fig. 4 with a central opening H: which is adapted to receive the upper part of the tapered portion of the hub 13. An upturned lip or flange I6 is formed at the edge of the opening l5. This flange when compressed fits to and coincides with the diameter of the bottom ll of the circumferential groove M- on the hub. When the hub 9 and the flange l2 are thus formed they are ready for their assembly. This is done by the following steps: first, the hub is inserted in the opening 15 until the lip I6 is in register with the circumferential groove It. The next step, is to compress the upturned lip l6 into the circumferential groove M. This serves to lock the hub It may be found desirable in some cases to provide an oil hole in the enlarged surface 6, so as to provide lubrication for the guide of the valve stem. Another wayto make the shield in two pieces as shown in Fig. '7 in whichas described and shown in Fig. 5, of application Serial No. 276,946, the shield is formed of a hub or socket member which is press fitted through the center of the shield instead of being formed integral as are the other forms shown in the drawings of that application.

In this construction the hub is pressed into the central opening and if desired may be spot welded or otherwise secured to the lower side of the enlarged striking surface of the hub.

- Having described my invention what I regard as new and desire to secure by Letters Patent is:

1. In combination with a valve having an upwardly directed stem biased by a surrounding spring, and an actuating member for engaging the end of the stem to depres the valve against the force of the spring; a two piece device normally resting solely upon the valve stem comprising a central metal socket member having an axial socket which extends partially therethrough, said socket being .adapted to fit the valve stem nicely yet freely and to house the end thereof, lateral movement of said device being restricted only by its engagement with said valve stem, a surface of said central member opposite said socket forcooperation with the actuating member, and .a metal flange projecting therefrom and mechanically secured thereto by relative deformation, said flange in its assembled relationship overhanging said spring and assuming a position closely adjacent thereto.

2. In combination with a valve having an up- ,wardly directed stem biased by a surrounding spring, and an actuating member for engaging the end of the stem to depress the valve against the force of the spring; a two piece device normally resting solely upon the valve stem comprising a central metal socket member having an axial socket which extends partially therethrough, said socket being adapted to flt the valve stem nicely yet freely and to house the end thereof, lateral movement of said device being restricted only by its engagement with said valve stem, .a surface of said central member opposite said socket for cooperation with the actuating member, and a metal flange secured to said member by relative deformation projecting therefrom, said flange in its assembled relationship overhanging said spring and assuming a position closely adjacent thereto, said surface having an area greater than that of the cross section of the valve stem.

3. In combination wfith a valve having an upwardly directed stem biased by a surrounding spring, and an actuating member for engaging the end of the stem to depress the valve against the force of the spring; a two piece device normally resting solely upon the valve stem comprising a central metal socket member having an axial socket which extends partially therethrough, said socket being adapted to fit the valve stem nicely yet freely and to house the end thereof, lateral movement of said device being restricted only by its engagement with said valve stem; a surface of said central member opposite said socket for cooperation with the actuating member, and a metal flange secured to said member by relative deformation projecting therefrom, said flange in its assembled relationship overhanging said spring and assuming a position closely adjacent thereto, said surface being penetrated by a lubricating opening in communication with said socket.

4. In combination with a valve having an upwardly. directed stem biased by a surrounding spring, and an actuating member for engaging the end of the stem to depress the valve against the force of the spring; a two piece stamping normally resting solely upon the valve stem comprising a central metal socket member having an axial socket which extends partially therethrough, said socket being adapted to fit the valve stem nicely yet freely and to house the end thereof, lateral movement of said stamping being restricted only by its engagement with said valve stem, a surface of said central member opposite said socket for cooperation with the actuating member, and a metal flange secured to said member by relative deformation projecting therefrom, said flange in its assembled relationship overhanging said spring and assuming a position closely adjacent thereto.

ERNEST L. WYLIE.

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