EXHAUST DEVICE AND VEHICLE WITH EXHAUST DEVICE

• US 20070251761A1
• Filed: 05/01/2007
• Published: 11/01/2007
• Est. Priority Date: 05/01/2006
• Status: Active Grant

• Current Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Original Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Inventors: Suzuki, Hiromi, Nishimura, Hidehiro, Shimoishi, Manabu
• Granted Patent: US 7,931,120 B2
• Time in Patent Office: Days
• US Class Current: 181/258
• CPC Class Codes: F01N 1/085 using a central core throttling gas passage
• CPC Class Codes: F01N 1/14 by adding air to exhaust gases in tailpipes F01N13/082, F01N13/20
• CPC Class Codes: F01N 2230/04 Catalytic converters
• CPC Class Codes: F01N 2450/22 by welding or brazing
• CPC Class Codes: F01N 2470/24 Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
• CPC Class Codes: F01N 2590/04 for motorcycles

Abstract

An exhaust device for a vehicle, such as a scooter type motorcycle, comprises an exhaust pipe and a muffler. A first end portion of the exhaust pipe is connectable to an engine of the vehicle. The muffler includes an outer wall defining an internal space of the muffler. A second end portion of the exhaust pipe is located within the internal space of the muffler. A secondary air induction pipe supplies air to the exhaust pipe and is connected to a portion of the exhaust pipe that is within the internal space of the muffler. The secondary air induction pipe extends to the outside of the muffler via a through hole that has an edge, at least a portion of which is defined by each of a first member and a second member of the muffler.

Claims

1. An exhaust device for a vehicle, comprising:

an exhaust pipe, the exhaust pipe having a first end portion and a second end portion, the first end portion of the exhaust pipe connectable to an engine of the vehicle;

a muffler comprising an outer wall defining an internal space of the muffler, wherein the second end portion of the exhaust pipe is located within said internal space;

a first purification member for purifying exhaust gas;

an air supply pipe that supplies air to the exhaust pipe and that is connected to a portion of the exhaust pipe located within the internal space of the muffler, wherein the air supply pipe supplies air to the exhaust pipe at a location upstream from the first purification member relative to a flow of exhaust gas within the exhaust pipe;

wherein the outer wall of the muffler is defined by at least a first member and a second member connected to the first member, the air supply pipe extends to the outside of the muffler via a through hole in the outer wall, wherein the first member and the second member of the muffler each define a portion of an edge of the through hole.

2. The exhaust device of claim 1, wherein one of the first member and the second member of the muffler comprises an exhaust pipe insertion member into or onto which the exhaust pipe is inserted, the exhaust pipe being secured to the insertion member of the muffler.

3. The exhaust device of claim 1, wherein the exhaust pipe includes a second purification member for purifying exhaust gas passing through the exhaust pipe.

4. The exhaust device of claim 3, wherein the second purification member is disposed between a portion of the exhaust pipe secured to the muffler and the portion of the exhaust pipe to which the air supply pipe is connected.

5. The exhaust device of claim 3, wherein the first and second purification members comprise catalysts that function to purify exhaust gas.

6. The exhaust device of claim 1, wherein the first member comprises a tubular body member and the second member comprises a cap member that is attachable to a first end portion of the tubular body member.

7. The exhaust device of claim 6, wherein the cap member is fitted within the first end portion of the tubular body member to overlap an inner surface of the first end portion and the cap member is secured to the tubular body member.

8. The exhaust device of claim 1, wherein the first member defines a first notch and the second member defines a second notch, and the first notch and the second notch cooperate to form at least a portion of the edge of the through hole.

9. The exhaust device of claim 8, wherein one of the first member and the second member is fitted to an inner surface of the other of the first member and the second member, and one of the first notch and the second notch has a depth that is larger than a depth of the other of the first notch and the second notch.

10. The exhaust device of claim 1, wherein the first member and the second member of the muffler are welded together by a first weld bead portion along an outer surface of the muffler, and the air supply pipe and the edge of the through hole of the muffler are welded together by a second weld bead portion around the outer periphery of the air supply pipe, and the first weld bead portion and the second weld bead portion are continuous with one another.

11. The exhaust device of claim 10, wherein a weld bead comprising the first weld bead portion and the second weld bead portion extends entirely around a circumference of the outer surface of the muffler.

12. The exhaust device of claim 10, wherein the muffler additionally comprises a third member located within the first member, the third member having a third notch that corresponds with the first notch of the first member, and wherein the first member, the second member and the third member of the muffler are secured to one another by a weld bead comprising the first weld bead portion and the second weld bead portion.

13. The exhaust device of claim 1, wherein the air supply pipe is secured to the exhaust pipe such that an axis of the air supply pipe is generally perpendicular to an axis of the exhaust pipe at the portion to which the air supply pipe is connected.

14. A vehicle, comprising:

an engine;

an exhaust pipe, the exhaust pipe having a first end portion and a second end portion, the first end portion of the exhaust pipe connectable to the engine to receive exhaust gases from the engine;

a muffler comprising an outer wall defining an internal space of the muffler, wherein the second end portion of the exhaust pipe is located within said internal space;

a first purification member for purifying exhaust gas;

an air supply pipe that supplies air to the exhaust pipe and that is connected to a portion of the exhaust pipe located within the internal space of the muffler, wherein the air supply pipe supplies air to the exhaust pipe at a location upstream from the first purification member relative to a flow of exhaust gas within the exhaust pipe;

wherein the outer wall of the muffler is defined by at least a first member and a second member connected to the first member, the air supply pipe extends to the outside of the muffler via a through hole in the outer wall, wherein the first member and the second member of the muffler each define a portion of an edge of the through hole.

15. The vehicle of claim 14, wherein the exhaust pipe includes a second purification member for purifying exhaust gas passing through the exhaust pipe.

16. The vehicle of claim 15, wherein the second purification member is disposed between a portion of the exhaust pipe secured to the muffler and the portion of the exhaust pipe to which the air supply pipe is connected.

17. The vehicle of claim 15, wherein the first and second purification members comprise catalysts that function to purify exhaust gas.

18. The vehicle of claim 14, wherein the first member defines a first notch and the second member defines a second notch, and the first notch and the second notch cooperate to form at least a portion of the edge of the through hole.

19. The vehicle of claim 18, wherein one of the first member and the second member is fitted to an inner surface of the other of the first member and the second member, and one of the first notch and the second notch has a depth that is larger than a depth of the other of the first notch and the second notch.

20. The vehicle of claim 14, wherein the first member and the second member of the muffler are welded together by a first weld bead portion along an outer surface of the muffler, and the air supply pipe and the edge of the through hole of the muffler are welded together by a second weld bead portion around the outer periphery of the air supply pipe, and the first weld bead portion and the second weld bead portion are continuous with one another.

21. The vehicle of claim 20, wherein the muffler additionally comprises a third member located within the first member, the third member having a third notch that corresponds with the first notch of the first member, and wherein the first member, the second member and the third member of the muffler are secured to one another by a weld bead comprising the first weld bead portion and the second weld bead portion.

22. The vehicle of claim 14, wherein the air supply pipe is secured to the exhaust pipe such that an axis of the air supply pipe is generally perpendicular to an axis of the exhaust pipe at the portion to which the air supply pipe is connected.