Aluminum Alloy Cylinder Head Using a Valve Guide
Aluminum alloy cylinder head with a valve guide bore to support a stem portion on the valve, said valve guide bore being integral with said cylinder head and having end means enhancing the wear resistance for the bore to rubbing by movement of the valve stem against said cylinder head, said cylinder head being formed by using a relatively thick portion which is positioned at a location where said valve stem guide bore is desireable, said wear resistance means created by forming pockets at opposite ends of said thick portion, filling said pockets by using a wear resistant alloy which integrally bonds with the aluminum alloy, and boring said guide bore through said filled material and said thick portion whereby said guide bore is produced with a cylindrical surface observed as an a midportion of relatively soft aluminum alloy and opposite end portions formed of wear resistant alloy.
In a conventional aluminum cylinder head, a tubular metal valve guide or sleeve is press fitted into a bore in the aluminum cylinder head off. Without this separate valve guide, a rubbing stem portion of a valve quickly wears away at the soft aluminum or aluminum alloy of the cylinder head. This resultants in sloppy and non-axial valve movements and even the passage of relatively large quantities of lubricating oil on the engine combustion chamber by travel between the valve stem along with the cylinder head.
Specifically, the cylinder head has a bore with integral portions of wear resistant metal alloy defferent from the head's aluminum mix. The guide bore is formed by machining pockets into the cylinder head's aluminum alloy at end regarding your valve guide encountered. Subsequently, a metal deposit way is utilized to fuse a powdered metal alloy to the aluminum cylinder head and fill the pockets with a copper based mix. Subsequently, a bore through the deposited material and thru the cylinder head forms a valve guide bore having a wear resistant 'collar' or annullus formed at either end of the guide bore.
The steps for manufacturing the sleeveless aluminum cylinder head been indicated above in the description of the apparatus but further detail is included eventually. Obviously, the first step is casting the cylinder head of aluminum. As previously stated, cast aluminum has insufficent hardeness to provide a durable cylinder head capable of long resisting wear by movement of a steel valve stem in a weary.
Although only a single embodiment of topic valvetrain drive apparatus has been illustrated in the drawings and described very well above, modifications are readily apparent to a single skilled in the art and the invention is to be described and classified.
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