Exhaust device for engine

Patent metadata

Field	Value
Publication number	US-10196969-B2
Application number	US-201615235150-A
Country	US
Kind code	B2
Filing date	Aug 12, 2016
Priority date	Aug 24, 2015
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

An exhaust device for an engine, interposed between an engine body, and a supercharger to be driven by a pressure of exhaust gas to be discharged from the engine body, includes a first exhaust passage and a second exhaust passage which introduce exhaust gas to the supercharger; a partition wall disposed between the first exhaust passage and the second exhaust passage, and configured to partition the first exhaust passage and the second exhaust passage from each other; and a valve disposed within the second exhaust passage, and configured to adjust the flow rate of exhaust gas flowing through the second exhaust passage. The partition wall includes a communication portion for communicating between the first exhaust passage and the second exhaust passage.

First claim

What is claimed is:

1. An exhaust device for an engine, interposed between an engine body, and a supercharger to be driven by a pressure of exhaust gas to be discharged from the engine body, the exhaust device comprising:
a first exhaust passage and a second exhaust passage which introduce exhaust gas to the supercharger, a cross-sectional area of the first exhaust passage being smaller than a cross-sectional area of the second exhaust passage;
a partition wall formed between the first exhaust passage and the second exhaust passage, and configured to partition the first exhaust passage and the second exhaust passage from each other; and
a valve disposed within the second exhaust passage, and configured to adjust a flow rate of exhaust gas flowing through the second exhaust passage, wherein
the partition wall includes a communication passage for communicating between the first exhaust passage and the second exhaust passage, and the communication passage connects the first exhaust passage to the second exhaust passage when the valve is closed, the communication passage extending along a line that extends from the first exhaust passage to the second exhaust passage, the communication passage having a maximum width in a direction transverse to the line, and the maximum width of the communication passage is less than a maximum width of the first exhaust passage in the direction transverse to the line and less than a maximum width of the second exhaust passage in the direction transverse to the line.

2. The exhaust device for an engine according to claim 1 , wherein
the communication passage is a cutout portion extending in a flow direction of exhaust gas from an upstream end of the partition wall in the flow direction.

3. The exhaust device for an engine according to claim 2 , wherein
the cutout portion extends from the upstream end of the partition wall to a downstream end of the partition wall.

4. The exhaust device for an engine according to claim 1 , wherein
the engine body includes a plurality of cylinders, and pistons which reciprocate within the respective cylinders,
each of the first exhaust passage and the second exhaust passage includes a plurality of independent passages communicating with the plurality of the cylinders,
the plurality of the independent passages of the first exhaust passage and the plurality of the independent passages of the second exhaust passage are respectively disposed in a row in a cylinder array direction, and
the communication passage is formed in both ends of the partition wall formed between the first exhaust passage and the second exhaust passage in the cylinder array direction.

5. The exhaust device for an engine according to claim 1 , wherein
the valve is a butterfly valve which rotates around an axis thereof extending in a direction orthogonal to a direction in which the first exhaust passage and the second exhaust passage are arranged, and
the butterfly valve is disposed in an inclined state in such a manner that an end of the butterfly valve on a side of the first exhaust passage is located on a downstream side in a flow direction of exhaust gas than an end of the butterfly valve on a side opposite to the first exhaust passage.

6. The exhaust device for an engine according to claim 1 , wherein a length of the communication passage along the line extending from the first exhaust passage to the second exhaust passage is greater than the maximum width of the communication passage.

7. The exhaust device according to claim 1 , wherein the communication passage is formed at an outer peripheral location of the valve.

8. An engine, comprising:
an engine body;
a turbocharger;
a valve; and
an exhaust manifold interposed between the engine body and the turbocharger, the exhaust manifold having a first exhaust passage, a second exhaust passage, and a partition wall, the first exhaust passage and the second exhaust passage being positioned to introduce exhaust gas from the engine body to the turbocharger, the valve being disposed within the second exhaust passage and configured to adjust a flow rate of exhaust gas flowing through the second exhaust passage, a cross-sectional area of the first exhaust passage being smaller than a cross-sectional area of the second exhaust passage, the partition wall being positioned between the first exhaust passage and the second exhaust passage to separate the first exhaust passage and the second exhaust passage from each other, the partition wall including a communication passage positioned between the first exhaust passage and the second exhaust passage, and the communication passage connects the first exhaust passage to the second exhaust passage when the valve is closed.

9. The engine according to claim 8 , wherein the communication passage is formed at an outer peripheral location of the valve.

10. The engine according to claim 8 , wherein
the communication passage is a cutout portion extending in a flow direction of exhaust gas from an upstream end of the partition wall in the flow direction.

11. The engine according to claim 10 , wherein
the cutout portion extends from the upstream end of the partition wall to a downstream end of the partition wall.

12. The engine according to claim 8 , wherein
the engine body includes a plurality of cylinders, and pistons which reciprocate within the respective cylinders,
each of the first exhaust passage and the second exhaust passage includes a plurality of independent passages communicating with the plurality of the cylinders,
the plurality of the independent passages of the first exhaust passage and the plurality of the independent passages of the second exhaust passage are respectively disposed in a row in a cylinder array direction, and
the communication passage is formed in both ends of the partition wall positioned between the first exhaust passage and the second exhaust passage in the cylinder array direction.

13. The engine according to claim 8 , wherein
the valve is a butterfly valve which rotates around an axis thereof extending in a direction orthogonal to a direction in which the first exhaust passage and the second exhaust passage are arranged, and
the butterfly valve is disposed in an inclined state in such a manner that an end of the butterfly valve on a side of the first exhaust passage is located on a downstream side in a flow direction of exhaust gas than an end of the butterfly valve on a side opposite to the first exhaust passage.

14. The engine according to claim 8 , wherein, the communication passage extends along a line that extends from the first exhaust passage to the second exhaust passage, the communication passage having a maximum width in a direction transverse to the line, and the maximum width of the communication passage is less than a maximum width of the first exhaust passage in the direction transverse to the line and less than a maximum width of the second exhaust passage in the direction transverse to the line.

15. The exhaust device for an engine according to claim 14 , wherein a length of the communication passage along the line extending from the first exhaust passage to the second exhaust passage is greater than the maximum width of the communication passage.

Assignees

• Mazda Motor

Inventors

• Suekuni Einosuke
• Umemura Junji
• Tsujita Shuhei
• Mihara Makoto
• Fujiyama Tomoaki
• Hamada Hiroyuki
• Hadama Kouji
• Ikeda Masahiro

Classifications

• F01N13/10

  of exhaust manifolds {(with cooling jacket F01N3/046)} · CPC title

• Y02T10/144

  Cross-Sectional Technologies · mapped topic

• F01N2340/06

  Arrangement of the exhaust apparatus relative to the turbine of a turbocharger · CPC title

• F02B37/22

  by varying cross-section of exhaust passages or air passages {, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits} (F02B37/24 takes precedence) · CPC title

• F01N2240/36

  an exhaust flap · CPC title