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US 4,792,161 AGranted
Structure for connecting ends of exhaust pipes
AssigneeUsui Kokusai Sangyo Kaisha Limited
InventorMasayoshi Usui
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AssigneeUsui Kokusai Sangyo Kaisha Limited
InventorMasayoshi Usui
Estimating the term…
A structure for connecting ends of exhaust pipes is disclosed. The structure for connecting is constituted by an annular elastic sealing member with heat resistance which is interposed between two overlapping surfaces of two cylinders in a temporally compressed manner, outwardly-projecting annular projection means each of which is disposed on the surfaces of the cylinders at the portions which do not overlap each other, a first coil spring member which is disposed at an adjustable interval above the surface of the cylinder, and two ends of which are secured to the annular projection means, a second coil spring member two ends of which are secured to two final coils of the first coil spring respectively, and which is disposed over the outer portion of the first coil spring in such a manner that the coil wire of the second coil spring is alternately disposed between the coil wire of the first coil spring.
A structure for connecting ends of exhaust pipes comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
No related US applications are recorded in the indexed filing history.
Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body: with means permitting relative movement,…
Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories: in relation to the exhaust…
Adjustable joints; Joints allowing movement: allowing substantial longitudinal adjustment or movement
Gas-flow silencers or exhaust apparatus for machines or engines in general
Term ended 1 Mar 2008 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
This invention relates to an improvement of a structure for connecting the ends of exhaust pipes which is directed to preventing vibrations of exhaust pipes within an exhaust system of an automobile.
2. Description of the Prior Art
FIG. 1 is a half cross-sectional view of a connecting structure between front ends of exhaust pipes according to an embodiment of the present invention;
FIG. 2 is a view illustrating the same portion as that shown in FIG. 1 according to another embodiment of the present invention; and
FIG. 3 is a half cross-sectional view of a conventional connecting structure.
In FIGS. 1 and 2, reference numerals 1 and 2 represent a pair of exhaust pipes each inside of which serves as an exhaust gas passage, and each of which has a cylindrical surface 1' and 2' respectively at the front end thereof in the connecting direction and an annular outwardly-projecting surface 1" and 2" respectively. Reference numeral 3 represents an annular sealing member made of steel wool, asbestos, or ceramic fiber or the like with heat resistance which is interposed between the overlapping portions of the cylindrical surfaces 1' and 2' of the pair of the exhaust pipes 1 and 2 in a temporally compressed manner. Reference numeral 4 represents a first coil spring having an annular cross section two ends of which are fastened 7 by welding or the like to the projecting surfacess 1" and 2" respectively around the outer cylindrical surface 2" of the overlapping portion at an adjustable interval 6. Reference numeral 5 represents a second coil spring having a triangular cross section which is disposed around the first coil spring 4 in such a manner that this second coil spring is positioned in close contact with the arc circular surface formed by the wire of the first coil spring 4. The two ends of the second coil spring 5 are fastened 8 to two final coils of the first coil spring 4 by welding or the like.
FIG. 2 shows an exmaple in which individual flange members 1a" and 2a" are welded to the exhaust pipes 1 and 2 for the purpose of fastening as an alternative to the annular projecting surfaces 1" and 2".
As described above, according to the present invention, the elastic sealing member 3 is interposed between the front cylindrical surfaces 1' and 2' in a temporally compressed manner. Furthermore, the projecting surfaces 1" and 2" or the welded flanges 1a" and 2a", which are respectively formed on the exhaust pipes 1 and 2, are connected each other by means of the first coil spring 4 at an adjustable interval 6. Furthermore, the first coil spring 4 is covered with the second coil spring 5 in a close-contact manner as describd above. As a result of this, free ends are created at the front ends of the cylindrical surfaces 1' and 2' of the exhaust pipes 1 and 2. Therefore, the exhaust pipes 1 and 2 can move freely within the adjustable interval 6 by means of the elastic deformation of the elastic sealing member 3. Furthermore, any vibration can be absorbed by means of the elastic sealing member 3, and sufficient sealing capability can be obtained. The second coil spring 5 follows the above described deflection of the first coil spring 4 with the close contact relationship between the two circular arc surfaces of the coil springs maintained, whereby it can deform freely in any directions including the radial direction.