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US 4,179,884 AGranted
Watercooled exhaust manifold and method of making same
AssigneeCaterpillar Tractor Co.
InventorWerner H. Koeslin
Life of this patent
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AssigneeCaterpillar Tractor Co.
InventorWerner H. Koeslin
Estimating the term…
A water-cooled engine exhaust manifold has an internal exhaust conduit or heat sheild comprised of a plurality of axially shiftable sections through which the hot exhaust gases pass from the engine to a hot gas turbocharger. A casing encircles the exhaust conduit and is held in spaced relationship to the exhaust conduit so as to provide dead air space or other insulating material space for insulating the hot exhaust gases from the casing. An outer shell encircles the casing and is sealed to exhaust inlet elbows and to fluid inlet flanges to provide a water jacket to cool the surface of the casing. The exhaust inlet elbows communicate with each different section of the exhaust conduit. Clearance is provided between the ends of each section of the exhaust conduit to permit expansion and axial shifting of the sections of the exhaust conduit without, in any way, interfering with the function and operation of the fluid-cooled jacket of the manifold. A novel method for assembling the sections of the exhaust conduit and the other parts of the manifold is provided.
In an exhaust gas manifold for an internal combustion engine comprising a casing having axially spaced apart gas inlet apertures therethrough, in combination an internal exhaust conduit nested in said casing, said exhaust conduit comprising a plurality of sections, each section slidably interfitting with an adjoining section, radially disposed means between sections of the exhaust conduit and said casing to hold the sections in spaced relation from said casing and to form dead air spaces between said exhaust conduit and said casing, each said section having an aperture aligned with one of the gas inlet apertures in said casing with said slidable interfit between said sections accommodating thermal axial expansion to maintain said alignment between the apertures in said casing and said sections.
In an exhaust gas manifold for an internal combustion engine comprising a casing having axially spaced apart gas inlet apertures therethrough, in combination an internal exhaust conduit nested in said casing, said exhaust conduit comprising a plurality of sections, each section slidably interfitting with an adjoining section, radially disposed means between at least one of said sections of the exhaust conduit and said casing to hold said section in spaced relation from said casing and to form dead air spaces between said exhaust conduit and said casing, wherein said radially disposed means between said exhaust conduit and said casing comprises a radially projecting flange on one end portion of each section, said flange contacting the interior of said casing to hold each section spaced from the interior of said casing, said flanges dividing the air space between said sections and said casing into a plurality of compartments, each said section having an aperture aligned with one of the gas inlet apertures in said casing with said slidable interfit between said sections accommodating thermal axial expansion to maintain said alignment between the apertures in said casing and said sections.
An exhaust gas manifold for an internal combustion engine comprising a casing having axially spaced apart apertures therethrough, a shell surrounding said casing and spaced therefrom to form a cooling fluid cavity therebetween, said shell being divided along its axis into two halves, cutouts formed in the mating edges of said halves, said halves being secured together whereby the cutouts form apertures aligned with the apertures in the casing, an internal exhaust conduit nested in said casing, flange means on said conduit engaging said casing to hold said conduit in spaced relation from said casing to form dead air spaces therebetween, said exhaust conduit having apertures aligned with the apertures in said casing and in said shell, a plurality of exhaust inlet elbows passing through the aligned apertures in said shell, casing and exhaust conduit, each inlet elbow having an inner wall spaced from an outer wall for defining a cavity therebetween, the inner wall of each inlet elbow sealed to said casing and the outer wall of each inlet elbow sealed to said shell with the cooling fluid cavity of the shell communicating with the cavity in each of the inlet elbows to provide cooling for said elbows, and an outlet elbow having spaced apart sleeves defining a cavity therebetween with one sleeve secured to said shell and the other sleeve secured to said casing with the cooling fluid cavity of said shell communicating with said cavity in said outlet elbow to provide cooling for said outlet elbow, said outlet elbow having an exhaust passage communicating with said exhaust conduit to pass exhaust gases from the exhaust conduit to an external location.
A method of making an exhaust manifold for an internal combustion engine which comprises the steps of:
A method of making an exhaust manifold for an internal combustion engine which comprises the steps of:
Dependencies are inferred from the claim text.