US1775844A - Poppet valve - Google Patents

Description

Sept. 16, 1930. R. E. BISSELL 1,775,844

POPPET VALVE Filed Aug. 2, 1926 IIMIIIIIIIIIIIIIIII III M Q @I Wm i Patented Sept. 1 6, 1930 unrrso STATES PATENT OFFICE J RICHARD E. BISSELL,'OF CLEVELAND HEIGHTS, OHIO, ASSIGNOR T THOMPSON PROD- UCTS INC., 01: CLEVELAND, OHIO, A. CORPORATION OF OHIO POPPET VALVE Application filed- August 2, 1926. Serial No. 126,354.

\ The invention relates to valves such as are employed in internal combustion engines, commonly referred to as poppet? valves,

- and more particularly to exhaust valves.

expansion is greater The heat of exploded gases of internal combustion engines is very high prior to and atthe time they pass the exhaust valves, and the valves are intensely heated thereby. Notwithstanding the fact that such valves are generally made of fine materials'with an ob ject to withstand high temperatures without warpage, such warpage and consequent loss of compression frequently occur. Warpage results from the fact that the valve head is irregularly heated at different points, result ing in irregularity of expansion, and when than the elastic limit of the metal, the original form is not restored.

Irrgularity of heating at different points of the head is of course due to the factthat some parts lie in a zone of constantly higher temperature than others, the temperature at and velocity 1 25.

any point being dependent upon the amount of the gas passing that-point and its proxi m1ty to the cooling medium.

' The object of my invention is to reduce this tendency to'warpage. w

This object is accomplished by equalizing the temperature of the head, by means of a ductivity than the head of higher heat conmain body of the head.

i The relation of the metal insert to the valve head, in the preferred form of the invention metal insert in the is shown in the accompanying drawings, in

which Figureihis a vertical section through a valve constructed in accordance with my inventlon, showing associated parts of the engine structure,

provide I Fig. 2 is a top plan view of the valve, head, and

Figure3 is a fragmentary vertical sectional view through the head of a modified form of valve in which the insert is entirely enclosed by. the body of the valve head.

In order to exemplify the principles of my invention, I have -shown a valve of well-known shape.

u'cha valve head with an insert of metal 1 fiering in characteristics from the received at a metal and a process of two are flattened out and the main body In accordance with my invention 1 main body of the head 2'in that the insert is of higher heat conductivity. The recess filled by the insert may be one in the head opening from the top face of thehead, or it may be an interior cavity as shown in Figure 3 entirel surrounded by' the material of the head. arious materials maybe selected for the insert butI have found that a nonferrous metal, such as bronze capable of withstandi-n a high temperature, serves Wellto accomplish the object desired. It will be apparent that in such a construction the heat point of high temperature will be quickly conducted to other parts of lower temperature,ther eby equalizing the temperature throughout the head.

So far as I am aware, I am the first to devise a valve head containing an insert of Such a valve and a process of constructing the same is disclosed and claimed broadly in my co-pending application Serial N 0. 126,355, filed concurrently herewith. The present application is restricted to avalve with an insert of metal such as will attain the objects set out above.

While the process of fabricating the valve is fully set out in' the copending application it may be here briefly described as consisting of forming a recess in theupper end of the piece of metal which is to form the main body of the head, inserting the high heat conducting metal therein, and then upsetting the end in suitable dies whereby th;

0 the material is caused to partially or wholly surround and retain the insert within the mainbody of the valve-head (Figure 3). While I have referred specifically to but one material as being suitable for the insert itsis obvious that many other materials are adapted to the purpose, and it is" therefore to be understood that the disclbsure herein is merely exemplary of the principles involved and that my invention is not confined thereto but includes all changes and modifications falling within the scope of the appended claims.

What I claim is:

making the same.

- of greater of said head disposed in said cavity for-1n-- suring a rapid conduction of heat from said head to said stem, while the valve is in use,-

piece interlocked headed member comprisinga stem, a head thereon and a flat insert in said head of, greater heat conductivity than that of said head interlocked with said head.

2. As an article of manufacture a twopiece interlocked headed member com rising a stem, a head thereon and an insert aving a relatively high rate of heat conductivity as compared with saidhead disposed wholly within said head including a relatively thin lateral portion extending toward the periph* eral edgeof saidhead and interlocked with the said head. i

3. As a new article of manufacture, a twopiece interlocked poppet valve having. a stem and a head integral therewith, said head ha ing an irregular cavity therein,-a metal insert heat conductivity than the metal said insert being bounded by -thin lateral portions extending toward the peripihery of said Y head and interlocked-with said ead. I

Signed by me this 22nd day of July, 1926.

I RICHARD E. BISSELL.

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