US1763340A - Poppet valve - Google Patents

Description

Juli-10,1930. @.EISSELL. 1,763,340

' POPPET VALVE 4 v Filed July 10, 1926 2 sheets-sneer( 1 June 1o, 1930.v R.; BISSELL `1,763,340

T VALVE Filed July 10, 1926 2 Sheets-Sheet 2 Arron/125K l Paiemeauan@ 11o, 1930s f rorrn'r `vAnvn Application filed July `1o,

M The invention relates to `poppet valves and, in its most specic features, to what is commonly` called a tulip valv 1 a One object ofthe invention is tomake Mprovision? for "grinding" such valves "while avoidingconstructions which present sharp points or edges which-tend to cause preignition, especially `in high compression engines. .s

Another object of the invention is to pro-` the power of the engine. l

crease the `tendency to warpage in t tulip valves, and to provide a valve which will run cooler than those heretofore employed. j "'Ihe objects are attained by changing the i formation of the valve heads of prior constructions as will be hereinafter explained.

For the purpose of exemplifying the prini ciples of my invention, `I disclose herein f several embodiments of the invention, but l i which lind their best expression in the tulip i Valve shown inFigure l. j `5 "In the annexed drawings:

j Figure 1 is avertical section taken through i 3 a valve constructed in accordance with my a invention showingthe adjacent parts of the engine structure, this form being the one now preferred by me.` l i i .Figa2 is a top plan view of the valve. i a ,l Figi?,` is a vertical section,similar to Fig. l 1, of a modified form. j, j

Figs. 4 and 5 are fragmentary cross-sectional views through the upper edgelof tulip `valves constructed in accordance with the prior art." j i Fig. 6;shows the ordinary poppet valve having a curved dome, provided with a rey"sa vide a `tulip valve head which will increase Other objects of the invention are to decess in itsupper face having a reentrant` 192e. seriaiiro. 121,569;

`to 15 inclusive. my invention it is necessary to consider the action of exhaust gases g in the process of exhaustion by tulip valves of prior construction,` which such valves s has been either fiat, as indicated at a, Fig.

4, or curved,as indicated at b,

Fig. 5. Inthecase of the flat upper edge c1 the gases, on their way `to the "exit opening past `the valve seat, are directed laterally outwardly as indicated by arrow 0 and'consequently have `to make a sharp` turn past the outer edge of accordance;` withvmy invention the upper `In order fully to understand are illustrated in Figs. etfand `5. VAs heretofore constructed the upper edge of the valve. In the case of the curvedupper edge b, a portion of the j f UNETFSTATES PTENTFEQ" RICHARD Bissau., oFoLnvELAND HEIGHTS, omdnssreivon To renown-son` Piton.`

edge of the valve is downwardly and outT wardlytinclined toward the valvefseatpr j i exitlopening, whereby the gases areV given i a single direction, thus avoidingfa sharp turnat the exitopening, asin the construe-i tion shown in Fig.` 4, or theeddy currents which attend` the use of the construction shownin Fig. 5. j .s i In accordance with `my invention a valve stem l is provided with ahead 2, having a valveseat 3, anda deep recess 4 in the `upper face; so formed as to provide a rein-` forcing ring 5 at the top and a curved stream line surface 6 joining the valve seat and the stem;.to this extent the-construction is that of theprior art 'knownin the.

trade as a tulip valve because of itsre` semblance tothe tulip flower.` But instead offormingthe upper edge of the valve Hat, as in Fig. 4:,.or curved, asin Fig..5, I give it a downward and outward 1nclination,or

stream line surface,: as indicated at 7 This surface iszpreferably a section of the frus- Vtum of` acone but it may be slightly curved. The inclination which will give the'best results `will depend upon" the formation of the adjacent walls of the enginecavity in which the valve may be employed, theextreme range for alltypes of engines to give IUS

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