Exhaust device for vehicle engine

• US 20060042871A1
• Filed: 08/30/2005
• Published: 03/02/2006
• Est. Priority Date: 08/31/2004
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Yamamoto, Kazuo, Koyanagi, Masashi, Yasuda, Kazuhiro, Oshima, Tadashi, Abe, Shintaro
• Granted Patent: US 7,434,656 B2
• Time in Patent Office: Days
• US Class Current: 181/227
• 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 11/00 Monitoring or diagnostic devices for exhaust-gas treatment apparatus , e.g. for catalytic activity safety, indicating or supervising devices for internal combustion engines F02B77/08; testing of machines G01M13/00
• 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 2470/02 Tubes being perforated
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

An exhaust device includes an exhaust pipe connected at its upstream end to a cylinder head of the engine and an exhaust muffler connected to the downstream end of the exhaust pipe for suppressing the generation of noise from a heat insulating cover that covers a part of the exhaust pipe. A heat insulating cover covers a portion of the exhaust pipe near the engine and a stay is fixed to the heat insulating cover. The stay includes a supporting plate portion curved so as to partially surround the outer circumference of the exhaust pipe. A first vibration isolating member is provided that is sandwiched between the outer circumference of the exhaust pipe and the supporting plate portion, a band member is tightened to mount the supporting plate portion to the exhaust pipe, and a second vibration isolating member is sandwiched between the supporting plate portion and the band member.

Claims

3-1. The exhaust device according to claim 1, wherein at least a part of said exhaust pipe has a double pipe structure including an inner pipe and an outer pipe surrounding said inner pipe, an annular resonance chamber being defined between said inner pipe and said outer pipe, said inner pipe being formed with a resonator hole communicating with said annular resonance chamber.

8. An exhaust device for an engine adapted to be mounted on a vehicle, said exhaust device having an exhaust pipe connected at its upstream end to a cylinder head of said engine and an exhaust muffler connected to the downstream end of said exhaust pipe, wherein:

said exhaust muffler comprises an outer cylinder, a pair of end caps for closing the opposite ends of said outer cylinder, and an inner cylinder set in said outer cylinder so as to define an annular closed chamber between said inner cylinder and said outer cylinder;

one end of said outer cylinder, one of said end caps, and one end of said inner cylinder being overlaid and welded together.

9. The exhaust device according to claim 8, wherein a large-diameter portion for making contact with the inner surface of said outer cylinder at its other end portion is formed at the other end of said inner pipe.

10. The exhaust device according to claim 8, wherein an intermediate large-diameter portion for making contact with the inner surface of said outer cylinder at its intermediate portion is formed at an intermediate portion of said inner cylinder.

11. The exhaust device according to claim 9, wherein an intermediate large-diameter portion for making contact with the inner surface of said outer cylinder at its intermediate portion is formed at an intermediate portion of said inner cylinder.

12. The exhaust device according to claim 8, wherein a tapering portion is formed at any one of the opposite ends of said inner cylinder so as to be tapered outwardly of said inner cylinder.

13. An exhaust device comprising:

an exhaust pipe adapted to be connected at an upstream end to a cylinder head of an engine and an exhaust muffler connected to a downstream end of the exhaust pipe;

a heat insulating cover for covering at least a portion of said exhaust pipe;

a stay fixed to said heat insulating cover, said stay having a supporting plate portion curved so as to partially surround the outer circumference of said exhaust pipe;

a first vibration isolating member sandwiched between the outer circumference of an exhaust pipe and said supporting plate portion;

a band member adapted to be tightened to mount said supporting plate portion to said exhaust pipe; and

a second vibration isolating member sandwiched between said supporting plate portion and said band member.

14. The exhaust device according to claim 13, wherein said first vibration isolating member and said second vibration isolating member are formed by bending a single vibration isolating sheet.

15. The exhaust device according to claim 13, wherein at least a part of said exhaust pipe has a double pipe structure including an inner pipe and an outer pipe surrounding said inner pipe, an annular resonance chamber being defined between said inner pipe and said outer pipe, said inner pipe being formed with a resonator hole communicating with said annular resonance chamber.

16. The exhaust device according to claim 14, wherein at least a part of said exhaust pipe has a double pipe structure including an inner pipe and an outer pipe surrounding said inner pipe, an annular resonance chamber being defined between said inner pipe and said outer pipe, said inner pipe being formed with a resonator hole communicating with said annular resonance chamber.

17. The exhaust device according to claim 15, wherein said inner pipe is fixed at one end thereof to said outer pipe and is slidably engaged at the other end with said outer pipe.

18. The exhaust device according to claim 16, wherein said exhaust muffler is provided with an inlet pipe, the downstream end of said outer pipe being fixed to said inlet pipe, one end of said inner pipe near an engine being fixed to the upstream end of said outer pipe.

19. The exhaust device according to claim 15, wherein said resonator hole is formed at one end portion of said inner pipe near said engine.

20. The exhaust device according to claim 13, wherein said band member is tightened to the exhaust pipe by a bolt being in engagement with slits in said band member to permit the band member to be tightened relative to the exhaust pipe.