US2007543A - Valve seat insert - Google Patents

Description

Patented July 9, 1935 a which like figuresrefer to like parts throughout.

- The object of the invention isto provide a valve seat that is held permanently in place by mechanical means so that there is no opportunity for it to work loose and as oftentimes happens fly off from its seat thereby accounting for a leaky. valve and loss ofcompression in the cylinder of V the engine.

Heretofore, due to the lack of means for holding the valve seat rigidly in predetermined position in the engine block, it would work loose under the terrific heat and pounding to which the actuation of the exhaust valve subjects it.

The object will be understood by referring to the drawing in which, 7

Fig. 1 is a perspective view showing an engine block in fragment with the improved valve seat disposed therein, parts being in section.

Fig. 2 is a detail enlarged view showing a transverse section ofthe valve seat.

Fig. 3 is a detail enlarged view showing a section taken on the line 3-3 of Fig. 1.

Referring more particularly to the drawing, a fragment of an internal combustion engine block showing a valve port is illustrated at l. Block l is counterbored at 2 for the reception of valve seat 3. Valve seat 3 is in the form of a ring whose outside, diameter is determined by the counter bore 2 of the port of block I. Valve seat or ring 3 is made of a hard steel to aid in resisting the terrific heat and pounding action of exhaust valve .seat 3.

The means for holding valve seat or ring 3 rigidly in place within its counterbore 2 in block ,I embodies an annular flange l0 made integral with the lower edge ll of ring 3. The lower edge of flange I0 is beveled at 8 with the apex outwardly for a purpose hereinafter described. 45

Furthermore, the diameter of the outer surface 12 of flange I0 is reduced somewhat from the ;diameter of the outer surface of ring 3. This effects a slight shoulder at l5. The reduced diameter of flange I0 will allow it to slip down easily into counterbore 2 'of block I and aid in guiding or steering ring 3 into correct position in counterbore 2. The outer diameter of ring 3 will flt snugly against the contiguous wall of counterbore 2 in block I, whereby to prevent any leakage.

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Flange l0 and I at six places as at l6, whereby to allow flange l0 to curl outwardly when under pressure from above on ring 3. To this end an annular recess [8 is made in block I adjacent the lower outer edge of counterbore 2 and communicating therewith. Recess I8 provides an undercut housing in block I, for the reception of flange [0 when forced therein by pressure on the upper edge of ring 3.

In operation, valve seat insert or ring 3 is disposed in counterbore 2 of block I with flange l3 downward. Said flange I0 will as mentioned above because of its slightly reduced outer diameter aid in guiding ring 3 into position in counterbore 2 of block I. The lower edge 20 of flange ID will come to rest on the horizontal surface 2| of block I. A block not shown is then placed on top of ring 3 and struck'with a hammer until flange I0 is forced outward and curled around into annular recess l8 ultimately assuming a substantially bead formation that is housed beneath the upper surface 22 of block I. This latter disposition of flange II] will hold permanently in position, exhaust valve seat 3, whereby to withstand the terrific heat and severe pounding action of said valve seat 3.

Furthermore, the bevel 8 on the lower edge of flange III will aid in directing said flange l0 towards and into annular recess I 8 in block I, whereaa'the splits l6 in the sides of flange it! will allow for outward expansion and curling of said flange l0 into annular recess 18.

It may be found desirable to make the upper portion of ring 3 of hard steel and to take the temper out of the lower or flange portion ill, to effect a more yielding metal in that location and thereby curl more easily when forced into rewould be impossible for the reason that ring 3 is not held in its seat in block I entirely by drive fit but also by the additional locking feature of flange loin recess l8.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is as follows:

1. In a valve seat insert, an engine block having a counterbore therein, a ring member fitted into the counterbore in said block, another member formed integral with said first named ring member, a recess made in said block, means permitting said last named member to curl into said recess, whereby to hold said ring in said block. 7 I

2. In a valve seat insert, an engine block having a counterbore therein, a ring member fitted into the counterbore in said block, another member formed integral with said first named ring mmher, a recess made in said block, and slits formed in said second named member to permit the last named said member to curl in said recess, whereby to hold said ring in said block. 1

3. In a valve seat insert, an engine block having a counterbore therein, a ring member fitted into the counterbore in said block, a flange formed integral with the first named ring member, an annular recess made in said block, said flange having slits formed therein allowing it to yield, whereby to curl into said recess and to hold said ring in said block.

4. In a valve seat insert, an under cut recess for a valve seat, a ring member having a flange formed thereon and slits formed in said flange to permit said flange to yield and curiunder said valve seat in said recess, whereby to hold said ring in said valve seat.

, 5. In a valve seat insert, an under-cut recess for a valve seat, a ring member having a flange portion mounted thereon, an annular shoulder formed between said flange and said ring member and slits made in said flange to permit it to curl, under said valve seat, whereby to hold said ring in said valve seat.

G. ERNEST MEEKER. 20

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