EXHAUST SYSTEM, A SADDLE RIDING TYPE VEHICLE HAVING THE SAME, AND A METHOD OF MANUFACTURING AND MOUNTING AN EXHAUST PIPE

• US 20110047998A1
• Filed: 08/20/2010
• Published: 03/03/2011
• Est. Priority Date: 09/02/2009
• Status: Active Grant

• Current Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Original Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Inventors: ADACHI, Makoto
• Granted Patent: US 8,678,038 B2
• Time in Patent Office: Days
• US Class Current: 60/324
• CPC Class Codes: F01N 13/008 Mounting or arrangement of exhaust sensors in or on exhaust apparatus sensor arrangements for engine control F02D41/1439
• CPC Class Codes: F01N 13/141 Double-walled exhaust pipes or housings
• CPC Class Codes: F01N 13/18 Construction facilitating manufacture, assembly, or disassembly
• CPC Class Codes: F01N 2450/20 by mechanical joints, e.g. by deforming housing, tube, baffle plate or parts thereof
• 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
• CPC Class Codes: Y10T 29/49398 Muffler, manifold or exhaust pipe making

Abstract

An exhaust system includes an exhaust pipe. The exhaust pipe includes an outer pipe and an inner pipe. A first through-hole and a second through-hole are provided in a peripheral surface of the outer pipe and a peripheral surface of the inner pipe, respectively, to receive an exhaust gas detector. Third through-holes are provided in the peripheral surface of the outer pipe, at a different position than that of the first through-hole. Since the third through-holes are provided in the outer pipe, a liquid can be drained promptly from a space between the outer pipe and inner pipe. Exhaust gas can be prevented from being discharged to the atmosphere by sealing the third through-holes.

Claims

1. An exhaust system for exhaust gas discharged from an engine, the exhaust system comprising:

an exhaust pipe including an inner pipe arranged to guide the exhaust gas and an outer pipe mounted outside of the inner pipe;

wherein

a first through-hole is provided in a peripheral surface of the outer pipe to receive an insert member inserted from outside the outer pipe into the inner pipe;

a second through-hole is provided in a peripheral surface of the inner pipe to receive the insert member; and

third through-holes are provided in the peripheral surface of the outer pipe at a different position than that of the first through-hole.

2. The exhaust system according to claim 1, wherein, when an exhaust system member is connected to the exhaust pipe, the third through-holes are arranged at a position inside of the exhaust system member.

3. The exhaust system according to claim 1, wherein the outer pipe includes a main body portion and a smaller diameter portion having a smaller outside diameter than the main body portion, the third through-holes being arranged in the smaller diameter portion.

4. The exhaust system according to claim 1, wherein the outer pipe and the inner pipe are joined adjacent the third through-holes to block a space between the outer pipe and the inner pipe.

5. The exhaust pipe system according to claim 1, wherein the inner pipe includes a main body portion and a larger diameter portion having a larger diameter than the main body portion, the third through-holes being arranged in the peripheral surface of the outer pipe, in a position which overlaps the larger diameter portion in a direction of a center axis of the outer pipe.

6. The exhaust system according to claim 1, further comprising a mounting member arranged to hold the insert member, wherein a gap between the mounting member and the outer pipe is sealed by a welded portion.

7. The exhaust system according to claim 1, further comprising a seal member arranged to seal the third through-holes.

8. The exhaust system according to claim 7, wherein the seal member is elastic.

9. The exhaust system according to claim 7, wherein the seal member includes at least one of a gasket, ceramic fiber, glass fiber, a heat insulating material, or a heat-resistant resin.

10. The exhaust system according to claim 7, further comprising a fixing member arranged to fix the seal member, wherein the seal member is disposed on an outer surface of the outer pipe so as to cover the third through-holes.

11. The exhaust system according to claim 10, wherein the fixing member is arranged to press the seal member onto the outer surface of the outer pipe.

12. The exhaust system according to claim 10, further comprising:

an exhaust system member connected to the exhaust pipe, with an end of the exhaust pipe inserted therein;

wherein

the exhaust system member includes a fitting portion arranged to receive the end of the exhaust pipe fitted therein;

the third through-holes are arranged within the fitting portion; and

the fixing member and the fitting portion are arranged to fix the seal member on the outer pipe.

13. The exhaust system according to claim 12, wherein the fixing member further includes a band member arranged to tighten the fitting portion to press the seal member.

14. A saddle riding type vehicle comprising:

an exhaust pipe including an inner pipe arranged to guide exhaust gas discharged from an engine and an outer pipe mounted outside of the inner pipe;

wherein

a first through-hole is provided in a peripheral surface of the outer pipe to receive an insert member inserted from outside the outer pipe into the inner pipe;

a second through-hole is provided in a peripheral surface of the inner pipe to receive the insert member; and

third through-holes are provided in the peripheral surface of the outer pipe at a different position from that of the first through-hole.

15. A method of manufacturing and mounting an exhaust pipe for exhaust gas discharged from an engine, and including an inner pipe arranged to guide the exhaust gas and an outer pipe mounted outside of the inner pipe, the method comprising the steps of:

draining at least one of a treating liquid for surface treatment and a liquid filled and frozen at a time of a bending process being performed, from a space between the outer pipe and the inner pipe through drain holes formed at least one end of the outer pipe; and

subsequently mounting the exhaust pipe in an exhaust system member while sealing the drain holes by inserting the at least one end of the outer pipe including the drain holes in an opening of the exhaust system member connected with the exhaust pipe.