Structure of an exhaust manifold branch collecting portion

• US 6,918,246 B2
• Filed: 03/25/2003
• Issued: 07/19/2005
• Est. Priority Date: 03/27/2002
• Status: Expired due to Fees

• Current Assignee: Nichia Corporation, Yumex Corporation
• Original Assignee: Nichia Corporation, Yumex Corporation
• Inventors: Ishiwa, Syuuichi, Madono, Hideaki, Shimamoto, Hideaki, Yasuda, Takashi, Tateiwa, Katsumi, Tominaga, Kazuya, Fukumoto, Yasuhiko
• Primary Examiner(s): Tran, Binh Q.
• Application Number:
  US10/395,121
• Publication Number:
  US 20030182937A1
• Time in Patent Office: 847 Days
• Field of Search: 602/72, 602/82, 603/05, 603/22, 603/23
• US Class Current: 60/323
• CPC Class Codes: F01N 1/24 by using sound-absorbing materials F01N1/04, F01N1/06, F01N1/10, F01N1/14, F01N1/16 take precedence
• CPC Class Codes: F01N 13/08 Other arrangements or adaptations of exhaust conduits pipes, joints or supports therefor in general F16L; collecting or removing exhaust gases of vehicle engines in workshops B08B15/00, on highways E01C1/005
• CPC Class Codes: F01N 13/10 of exhaust manifolds with cooling jacket F01N3/046
• CPC Class Codes: F01N 13/102 having thermal insulation
• CPC Class Codes: F01N 13/18 Construction facilitating manufacture, assembly, or disassembly
• CPC Class Codes: F01N 13/1827 Sealings specially adapted for exhaust systems sealings in general F16J15/00
• CPC Class Codes: F01N 13/1838 characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
• CPC Class Codes: F01N 2260/10 for avoiding stress caused by expansions or contractions due to temperature variations
• CPC Class Codes: F01N 2310/00 Selection of sound absorbing or insulating material
• CPC Class Codes: F01N 2530/26 Multi-layered walls

Abstract

A structure of an exhaust manifold branch collecting portion includes a double collecting pipe 21 for collecting a plurality of exhaust openings 11A, 17A. The double collecting pipe 21 is comprised of an inner pipe 21-1 and an outer pipe 21-2, which are connected integrally to each other. In a space formed between the inner pipe 21-1, the outer pipe 21-2, and a ring-shaped stainless steel cushion member 22-2, a tubular cushion member 22-1, which is thermally expanded and foamed, is arranged as a restricted cushion structure.

Claims

1. A structure of an exhaust manifold branch collecting portion including a collecting pipe for collecting a plurality of exhaust openings, wherein the collecting pipe is constructed as a double collecting pipe arrangement comprised of an inner pipe and an outer pipe, and wherein a noise absorption/heat insulating material to be expanded by heating is arranged between the inner pipe and the outer pipe, wherein the noise absorption/heat insulating material remains expanded when cooled after being once heated.

2. A structure of an exhaust manifold branch collecting portion according to claim 1, wherein the noise absorption/heat insulating material is heated and expanded by heat of exhaust gas from an engine.

3. A structure of an exhaust manifold branch collecting portion according to claim 1, wherein one ends of the inner pipe and the outer pipe are connected to each other, and a cushion part is arranged between the other ends of the inner pipe and the outer pipe.

4. A structure of an exhaust manifold branch collecting portion according to claim 2, wherein one ends of the inner pipe and the outer pipe are connected to each other, and a cushion part is arranged between the other ends of the inner pipe and the outer pipe.

5. A structure of an exhaust manifold branch collecting portion according to claim 3, wherein the cushion part is an elastic mesh member, into which a stainless steel wire is woven.

6. A structure of an exhaust manifold branch collecting portion according to claim 4, wherein the cushion part is an elastic mesh member, into which a stainless steel wire is woven.

7. A structure of an exhaust manifold branch collecting portion according to claim 1, wherein a heat resisting layer is arranged between the inner pipe and/or the outer pipe and the noise absorption/heat insulating material.

8. A structure of an exhaust manifold branch collecting portion according to claim 2, wherein a heat resisting layer is arranged between the inner pipe and/or the outer pipe and the noise absorption/heat insulating material.

9. A structure of an exhaust manifold branch collecting portion according to claim 3, wherein a heat resisting layer is arranged between the inner pipe and/or the outer pipe and the noise absorption/heat insulating material.

10. A structure of an exhaust manifold branch collecting portion according to claim 4, wherein a heat resisting layer is arranged between the inner pipe and/or the outer pipe and the noise absorption/heat insulating material.

11. A structure of an exhaust manifold branch collecting portion according to claim 5, wherein a heat resisting layer is arranged between the inner pipe and/or the outer pipe and the noise absorption/heat insulating material.

12. A structure of an exhaust manifold branch collecting portion according to claim 6, wherein a heat resisting layer is arranged between the inner pipe and/or the outer pipe and the noise absorption/heat insulating material.

13. A structure of an exhaust manifold branch collecting portion according to claim 1, wherein the expansion ratio is 4.0 or more after heating for 30 minutes at 850°

C.