Engine unit

Patent metadata

Field	Value
Publication number	US-9347350-B2
Application number	US-201314112395-A
Country	US
Kind code	B2
Filing date	Mar 29, 2013
Priority date	Mar 29, 2013
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

An engine unit includes an engine, an exhaust gas treatment device and a connecting pipe. The engine has an exhaust gas port. The exhaust gas treatment device is arranged above the engine. The connecting pipe connects the exhaust gas port and the exhaust gas treatment device. The connecting pipe has an expandable-contractible bellows portion. The bellows portion has a linear form following the upward-downward direction. The lower end portion of the bellows portion is positioned lower than at least a part of the exhaust gas port.

First claim

The invention claimed is:

1. An engine unit comprising:
an engine having an exhaust gas port;
an exhaust gas treatment device arranged above the engine; and
a connecting pipe connecting the exhaust gas port and the exhaust gas treatment device, the connecting pipe having an expandable-contractible bellows portion,
the bellows portion having a linear form following an upward-downward direction, with a lower end part of the bellows portion being positioned lower than at least a part of the exhaust gas port,
the connecting pipe having a first connecting pipe portion connecting the exhaust gas port and the lower end portion of the bellows portion, and
the first connecting pipe portion having a form bending from the exhaust gas port toward a downward position lower than the exhaust gas port.

2. The engine unit according to claim 1 , wherein
an upper end of the bellows portion is positioned higher than a lower end portion of the exhaust gas treatment device.

3. The engine unit according to claim 1 , wherein
a length of the bellows portion is longer than a distance in the upward-downward direction between a lower end portion of the exhaust gas treatment device and an upper end portion of the exhaust gas port.

4. The engine unit according to claim 1 , further comprising
a bracket with the exhaust gas treatment device arranged thereon, the first connecting pipe portion having a supporting part supporting the bracket.

5. The engine unit according to claim 1 , wherein
the exhaust gas treatment device has a cylindrical portion and an end face closing an end of the cylindrical portion in an axial direction of the exhaust gas treatment device, and
the connecting pipe connects to the end face of the exhaust gas treatment device.

6. The engine unit according to claim 5 , wherein
the connecting pipe has a second connecting pipe portion connecting the end face of the exhaust gas treatment device and an upper end portion of the bellows portion, and
the second connecting pipe portion is directly mounted on the end face of the exhaust gas treatment device.

7. The engine unit according to claim 1 , wherein
the bellows portion has a first bellows tube and a second bellows tube, the second bellows tube being a separate body from the first bellows tube, and the second bellows tube being connected to the first bellows tube.

8. The engine unit according to claim 1 , wherein
the engine has a crankshaft, and
the exhaust gas treatment device is arranged such that an axial line of the exhaust gas treatment device follows an axial direction of the crankshaft.

9. A working vehicle including the engine unit according to claim 1 .

10. The working vehicle according to claim 9 , further comprising:
an engine room housing the engine unit; and
a cab arranged adjacent to the engine room,
the engine room having a wall part arranged between the cab and the engine, and
the bellows portion being arranged so as to extend in the upward-downward direction following the wall part.

11. The working vehicle according to claim 10 , wherein
the exhaust gas treatment device comprises a first exhaust gas treatment device; and
the working vehicle further includes
a second exhaust gas treatment device disposed on a side of the first exhaust gas treatment device;
a rear end portion of the second exhaust gas treatment device being positioned rearward of a rear end portion of the first exhaust gas treatment device;
the wall being positioned rearward of the first exhaust gas treatment device; and
the bellows portion being arranged to extend in the upward-downward direction following the wall part in a space between the wall part and the first exhaust gas treatment device.

Assignees

• Komatsu Mfg Co Ltd

Inventors

• Ozaki Taira
• Nakagami Hiroshi
• Yamamitsu Hironori
• Namimatsu Kanji
• Ohta Hiroshi
• Matsubara Kenji

Classifications

• F01N13/1816

  the pipe sections being joined together by flexible tubular elements only, e.g. using bellows or strip-wound pipes · CPC title

• Y02T10/20

  Cross-Sectional Technologies · mapped topic

• F01N3/08 Primary

  for rendering innocuous (using electric or electrostatic separators F01N3/01; chemical aspects B01D53/92) · CPC title

• F01N13/009

  having two or more separate purifying devices arranged in series · CPC title

• F01N2470/12

  Tubes being corrugated · CPC title