Cooled exhaust valve and methods of manufacture thereof
AssigneeSociete d'Etudes de Machines Thermiques
InventorKarl Walter Kuhn
Life of this patent
Estimating the term…
Abstract
Exhaust valve for an internal combustion engine, of the type cooled by fluid circulation and comprising a valve head and a stem screwed into the said head. Said exhaust valve comprises intake and return ducts for the cooling liquid, which are parallel and open into a chamber in the valve head, and which are external relative to one another and substantially symmetrical with respect to the longitudinal axis of the said stem.
Claims19
A fluid cooled valve member construction comprising a hollow head portion and a stem portion connected to said head portion, said stem portion being formed with a plurality of longitudinally extending, spaced, substantially straight bore-like ducts communicating with the inside of said hollow head portion for conveyance of cooling fluid toward the inside of said hollow head portion and reversely outwardly therefrom, said ducts being arranged in pairs of diametrically opposed substantially co-extensive ducts in said stem, at least one pair of said diametrically opposed ducts directing the flow of said fluid in a fluid-feeding direction into said hollow head portion serving thus as fluid feed ducts, and at least a second pair of said diametrically opposed ducts leading flow of said fluid in a reverse direction outwardly of said hollow head portion, said second pair of ducts serving as fluid return ducts, said ducts of said pairs of ducts being uniformly distributed in equal circumferentially spaced relationship about the longitudinal center line axis of said stem portion with feed ducts alternating successively with return ducts.
A fluid-cooled poppet-valve member construction comprising a hollow head portion and a stem portion connected to said head portion, said stem portion being formed with at least two, spaced, bore-like ducts for conveying cooling fluid, said ducts extending at least partially through and at least approximately longitudinally of said stem portion and communicating with the inside of said hollow head portion and with the outside of said valve member, at least one of said ducts having its center line spaced from the longitudinal axis of said stem portion and extending substantially helically about said axis, at least one duct being a feed duct for supplying fluid to said head portion and at least another duct being a return duct for conveying said fluid back and away from said head portion.
A method of making a stem for a fluid-cooled poppet valve member, comprising the steps of:
- providing a substantially round rectilinear, rod-like bar element;
- directly forming said bar element integrally with at least two spaced, at least approximately parallel, substantially straight bore-like ducts extending at least partially through and generally longitudinally of said bar element and opening in the terminal front face of at least one end thereof;
- and twisting said bar element about its longitudinal axis to cause at least one of said ducts to wind substantially helically about said longitudinal axis.
A fluid-cooled valve member construction comprising a hollow-head portion and a stem portion connected to said head portion, said stem portion being formed with a plurality of longitudinally extending, spaced, substantially straight bore-like ducts for conveyance toward the inside of said hollow-head portion and reversely outwardly from said valve member of cooling fluid, said ducts being arranged in at least one pair of diametrically opposed substantially co-extensive ducts in said stem, at least each one of said bore-like ducts communicating with at least one transverse duct on the one hand for directing a flow of said fluid in a fluid-feeding direction into said hollow-head portion through at least one of said bore-like ducts thus serving as fluid-feed ducts, and on the other hand for directing a flow of said fluid in a reverse direction outwardly of said hollow-head portion through another of said bore-like ducts thus serving as fluid return ducts, said bore-like ducts being uniformly distributed in equal circumferentially spaced relationship about the longitudinal central axis of said stem portion with feed ducts alternating successively with return ducts.
A fluid-cooled poppet valve member construction consisting of an assembly of at least two component parts tightly connected together and comprising:
- a hollow mushroom head portion including a substantially transverse end wall and formed with an inner chamber and with a substantially coaxial opening opposite to and of smaller extent than said transverse end wall;
- and a stem portion secured in sealing relationship to and extending endwise from said head portion;
- said stem portion consisting of a solid body of material of substantially round rod-like configuration throughout its length extending in tightly engaging relationship through said opening to project bodily into said chamber with one end which is thus enclosed in and surrounded by said chamber, said stem portion being provided with at least two pairs of at least approximately parallel bore-like ducts extending at least partially through and generally longitudinally of said stem portion, each duct being directly formed and entirely defined within said solid body of material and made integral in one piece therewith to serve as a passage-way channel for leading a stream of cooling fluid flowing lengthwise therethrough, each duct communicating on the one hand with said chamber at its end portion located adjacent and inside said chamber and on the other hand with the outside toward its opposite end portion remote from said head portion, both ducts of each pair being substantially diametrically opposed and symmetrical with respect to the longitudinal center line axis of said stem portion so as to be opposite to each other in relation to said center line axis, both ducts of at least one pair of opposite ducts leading said flow of cooling fluid in one same direction whereas both opposite ducts of each remaining pair of ducts are leading said flow of cooling fluid in a same opposite direction so as to thereby provide at least one pair of feed ducts for supplying cooling fluid to said head portion and at least one pair of return ducts for conveying said fluid back and away from said head portion.
A fluid-cooled poppet valve member construction consisting of an assembly of at least two component parts tightly connected together and comprising:
- a hollow mushroom head portion including a substantially transverse end wall and formed with an inner chamber and with a substantially coaxial opening opposite to and of smaller extent than said transverse end wall;
- and a stem portion engaging said opening and secured in sealing screw-threaded relationship to and extending endwise from said head portion;
- said stem portion consisting of a solid body of material of substantially round rod-like configuration throughout its length extending in tightly engaging relationship through said opening to project bodily into said chamber with one end which is thus enclosed in and surrounded by said chamber, said stem portion being provided with a plurality of at least two spaced, bore-like ducts extending at least partially through and generally longitudinally of said stem portion, each duct being directly formed and entirely defined within said solid body of material and made integral in one piece therwith to serve as a passage-way channel for leading a stream of cooling fluid flowing lengthwise therethrough, said stem portion being formed with a substantially flat terminal front face at its inner end abutting endwise with pressure contact against a corresponding substantially flat central region of said transverse end wall of said head portion for supporting and backing said end wall and thereby defining an annular cavity within said chamber, each duct communicating on the one hand with said chamber at its end portion located inside said chamber by opening in said terminal front face of said stem portion where said ducts are closed off by said transverse end wall and on the other hand with the outside towards its opposite end portion remote from said head portion, at least one duct being a feed duct for supplying cooling fluid to said head portion and at least another duct being a return duct for conveying said fluid back and away from said head portion, said stem portion having sidewise and inside said chamber a plurality of transverse ducts opening at one end thereof into said ducts, respectively, and at the opposite end thereof into said chamber, whereby said chamber communicates with each feed duct through at least one transverse outlet duct and with each return duct through at least one transverse inlet duct.
Dependencies are inferred from the claim text.