Exhaust control device of engine

• US 4,817,374 A
• Filed: 09/11/1987
• Issued: 04/04/1989
• Est. Priority Date: 09/13/1986
• Status: Expired due to Term

• Current Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Original Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Inventors: Kitta, Hideaki
• Primary Examiner(s): Hart, Douglas
• Application Number:
  US07/096,592
• Time in Patent Office: 571 Days
• Field of Search: 60/313, 60/323, 137/595, 180/219
• US Class Current: 60/313
• CPC Class Codes: F01N 1/165 for adjusting flow area
• CPC Class Codes: F02B 27/06 the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y10T 137/87161 With common valve operator

Abstract

An exhaust control device for an exhaust system for an internal combustion engine specifically applied to a motorcycle. An exhaust control device is incorporated that includes a single valve body having a plurality of exhaust gas passages that cooperate with each of a plurality of exhaust pipes that extend from the engine to the valve body. Parallel valve shafts are supported in the valve body and support valves that control the flow through the exhaust gas passages.

Claims

1. An exhaust system for an internal combustion engine having first and second exhaust ports, a first exhaust pipe extending from said first exhaust port, and a second exhaust pipe extending from said second exhaust port, a single valve body formed with first and second exhaust passages spaced vertically one above the other, means for communicating a horizontally extending portion, of said first exhaust pipe with said first exhaust gas passage of said valve body, means for communicating a horizontally extending section of said second exhaust pipe with said second exhaust gas passage of said valve body, a first valve shaft journaled in said valve body for rotation about a horizontally extending axis, a second valve shaft journaled in said valve body and rotatable about a horizontally extending axis, a first valve element fixed to said first valve shaft within said first exhaust gas passage for controlling the flow therethrough, a second valve element fixed to said second valve shaft within said second exhaust gas passage for controlling the flow therethrough, and means for simultaneously connecting said first and said second shafts for common rotation.

2. An exhaust system as set forth in claim 1 further including a further exhaust gas passage formed in the valve body and communicating with a horizontally extending portion further exhaust pipe, said further exhaust gas passage lying in a common horizontal plane with the first exhaust gas passage with the first valve shaft extending therethrough, and a further valve element fixed to said first valve shaft within said further exhaust gas passage.

3. An exhaust system as set forth in claim 1 wherein the valve body is formed with a third exhaust passage communicating with a third exhaust pipe extending from a third exhaust port of the engine and a fourth exhaust passage communicating with a fourth exhaust pipe extending from a fourth exhaust port of the engine, there being a third valve element fixed to said first valve shaft within said third exhaust gas passage for controlling the flow therethrough and a fourth valve element fixed to the second valve shaft within said fourth exhaust gas passage for controlling the flow therethrough.

4. An exhaust system for an internal combustion engine having first, second and further exhaust ports, a first exhaust pipe extending from said first exhaust port, a second exhaust pipe extending from said second exhaust port a further exhaust pipe extending from said further exhaust port, a single valve body formed with first, second and further exhaust passages, means for communicating said first exhaust pipe with said first exhaust gas passage of said valve body, means for communicating said second exhaust pipe with said second exhaust gas passage of said valve body, means for communicating said further exhaust pipe with said further exhaust passage, a first valve shaft journaled in said valve body, a second valve shaft journaled in said valve body, a first valve element fixed to said first valve shaft within said fist exhaust gas passage controlling the flow therethrough, a second valve element fixed to said second valve shaft within said second exhaust gas passage for controlling the flow therethrough, a further valve element fixed to said first valve shaft within said further element gas passage and means for simultaneously connecting said first and said second shafts for common rotation, some of the exhaust gas passages being positioned vertically above each other.

5. An exhaust system as set forth in claim 4 wherein the first and further exhaust gas passages are positioned transversely outwardly from the second exhaust gas passage.

6. An exhaust system for an internal combustion engine having first, second, third and forth exhaust ports, a first exhaust pipe extending from said first exhaust port, a second exhaust pipe extending from said second exhaust port, a third exhaust pipe extending from said third exhaust port, a fourth exhaust pipe extending from said fourth exhaust port, a single valve body formed with first, second, third, and fourth exhaust passages, means for communicating said first exhaust pipe with said first exhaust passage of said valve body, means for communicating said second exhaust pipe with said second exhaust passage of said valve body, means communicating said third exhaust pipe with said third exhaust passage of said valve body, means for communicating said fourth exhaust pipe with said fourth exhaust passage of said valve body, a first valve shaft journaled in said valve body, a second valve shaft journaled in said valve body, a first valve element fixed to said first valve shaft within said first exhaust passage for controlling the flow therethrough, a second valve element fixed to said second valve shaft within said second exhaust passage for controlling the flow therethrough, a third valve element fixed to said first valve shaft within said third exhaust gas passage for controlling the flow therethrough, a fourth valve element fixed to said second valve shaft within said fourth exhaust passage for controlling the flow therethrough and means for simultaneously connecting said first and said second shafts for common rotation, said first and third exhaust gas passages being lying above said second and fourth exhaust gas passages.

7. An exhaust system as set forth in claim 6 wherein the first and third exhaust gas passages are spaced apart transversely a greater distance than the spacing between the second and fourth exhaust gas passages.

8. An exhaust system for a motorcycle having a single dirigible front wheel and a single driven rear wheel, an internal combustion engine having first and second exhaust ports, a first exhaust pipe extending from said first exhaust port, a second exhaust pipe extending from said second exhaust port, a single valve body formed with first and second exhaust passages, means for communicating said first exhaust pipe with said first exhaust gas passage of said valve body, means for communicating said second exhaust pipe with said second exhaust gas passage of said valve body, a first valve shaft journaled in said valve body, a second valve shaft journaled in said valve body, a first valve element fixed to said first valve shaft within said first exhaust gas passge for controlling the flow therethrough, a second valve element fixed to said second valve shaft within said second exhaust gas passage for controlling the flow therethrough, and means for simultaneously connecting said first and said second shafts for common rotation, said engine being positioned within said motorcycle between said front and rear wheel and containing a transmission assembly for driving said rear wheel, said single valve body being positioned beneath said transmission.

9. An exhaust system as set forth in claim 8 wherein the exhaust pipes extend forwardly from a transversely extending cylinder arrangement and then downwardly and rearwardly.

10. An exhaust system as set forth in claim 9 wherein the first and second exhaust gas passages are vertically spaced one above the other.

11. An exhaust system as set forth in claim 9 further including a further exhaust gas passage formed in the valve body and communicating with a further exhaust pipe, said further exhaust gas passage lying in a common horizontal plane with the first exhaust gas passage with the first valve shaft extending therethrough, and a further valve element fixed to said first valve shaft within said further exhaust gas passage.

12. An exhaust system as set forth in claim 11 wherein at least some of the exhaust gas passages are positioned vertically above each other.

13. An exhaust system as set forth in claim 12 wherein the first and further exhaust gas passages are positioned transversely outwardly from the second exhaust gas passage.

14. An exhaust system as set forth in claim 10 further including a further exhaust gas passage formed in the valve body and communicating with a further exhaust pipe, said further exhaust gas passage lying in a common horizontal plane with the first exhaust gas passage with the first valve shaft extending therethrough, and a further valve element fixed to said first valve shaft within said further exhaust gas passage.

15. An exhaust system as set forth in claim 10 wherein the valve body is formed with a third exhaust passage communicating with a third exhaust pipe extending from a third exhaust port of the engine and a fourth exhaust passage communicating with a fourth exhaust pipe extending from a fourth exhaust port of the engine, there being a third valve element fixed to said first valve shaft within said third exhaust gas passage for controlling the flow therethrough and a fourth valve element fixed to the second valve shaft within said fourth exhaust gas passage for controlling the flow therethrough.

16. An exhaust system as set forth in claim 15 wherein the first and third exhaust gas passages lie above the second and fourth exhaust gas passages.

17. An exhaust system as set forth in claim 16 wherein the first and third exhaust gas passages are spaced apart transversely a greater distance than the spacing between the second and fourth exhaust gas passages.