Thin-walled double pipe exhaust manifold
AssigneeCalsonic Corporation
InventorsTakashi Kojima, Yasuo Fukae
Life of this patent
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Abstract
A thin-walled double pipe exhaust manifold comprises a double pipe consisting of a comparatively thin inner tube and a comparatively thick outer tube, both spaced apart from each other adiabatically through an aperture defined between these tubes. The inner tube is formed with at least one bead portion for relieving thermal stresses induced in the inner tube. To effectively reduce thermal stresses by way of thermal expansion or contraction, the bead portion is provided around each heat spot similarly to the temperature distribution of each heat spot.
Claims11
A thin-walled double pipe exhaust manifold for internal combustion engines, comprising:
- a thin-walled main double pipe including an inner tube and an outer tube, said tubes being spaced apart from each other adiabatically through a space defined between said tubes;
- a plurality of thin-walled branch pipes connected to said main double pipe and including an inner tube and an outer tube, said tubes being spaced apart from each other adiabatically through a space defined between said tubes;
- and
- relief means for relieving thermal stresses induced in said inner tube, said relief means including at least one bead portion formed at said inner tube;
- wherein said bead portion formed in the vicinity of heat spots against each of which exhaust gases blow at a given inflow angle.
A thin-walled double pipe exhaust manifold for internal combustion engines, comprising:
- an inner tube and an outer tube, said tubes being spaced apart from each other adiabatically through a space defined between said tubes, said inner tube having a main tube section and a plurality of input branches,
- wherein exhaust gases are blown into the main tube section through the input branches and form heat spots along the main tube section at points along the main tube section against which the exhaust gases blow as the exhaust gases exit the input branches and enter the main tube section, and
- wherein the main tube section includes at least one bead portion at one of the heat spots.
Dependencies are inferred from the claim text.