Work vehicle with diesel particulate filter

Patent metadata

Field	Value
Publication number	US-8960359-B2
Application number	US-201213562557-A
Country	US
Kind code	B2
Filing date	Jul 31, 2012
Priority date	Mar 30, 2012
Publication date	Feb 24, 2015
Grant date	Feb 24, 2015

Abstract

A work vehicle includes a cooling fan, an engine, and a diesel particulate filter (DPF) purifying exhaust gas of the engine, placed under a hood in that order, beginning at the front. Exhaust gas from the engine is exhausted through an exhaust passage after passing through the DPF. The cooling fan supplies cooling air to the rear. The DPF is placed such that a length direction thereof follows a width direction of a vehicle body. The exhaust passage includes a first passage, a second passage, and a third passage. The first passage extends forward and upward from the DPF before extending along the length direction thereof on a front side of the DPF. The second passage extends downward from a downstream portion of the first passage. The third passage extends to the rear from a downstream portion of the second passage and also includes an exhaust outlet.

First claim

What is claimed is:

1. A work vehicle comprising, at a rear portion of a vehicle body, a cooling fan, an engine, and a diesel particulate filter which purifies exhaust gas from the engine,
the work vehicle being configured such that the exhaust gas from the engine is exhausted through an exhaust passage extending from the diesel particulate filter after passing through the diesel particulate filter, wherein
the cooling fan, the engine, and the diesel particulate filter are placed in that order from a front direction in a front-rear direction of the vehicle body,
the cooling fan is placed so as to supply cooling air to the rear while the diesel particulate filter is placed such that a length direction of the diesel particulate filter follows a width direction of the vehicle body, and
the exhaust passage comprises:
a first passage extending forward and upward from the diesel particulate filter before extending along the length direction of the diesel particulate filter on a front side of the diesel particulate filter;
a second passage extending downward from a downstream portion of the first passage; and
a third passage extending to the rear from a downstream portion of the second passage and having an exhaust outlet.

2. The work vehicle according to claim 1 , wherein a portion extending along a length direction of the first passage is positioned further to the rear in the downstream direction.

3. The work vehicle according to claim 2 , wherein the second passage is positioned further forward the lower a portion of the second passage is.

4. The work vehicle according to claim 1 , wherein
the exhaust passage comprises a plurality of connected pipe members,
the pipe members have a larger diameter further downstream,
at a portion connecting the pipe members with each other, positioned at a portion extending along the length direction of the first passage, a terminal end portion of an upstream pipe member is inserted into an introductory end portion of a next downstream pipe member in a state where a gap exists in a diameter direction, and
a plate member formed along a rear portion in a circumferential direction of the introductory end portion is provided to a rear side of the upstream pipe member, extending along the first passage from the rear portion in the circumferential direction of the introductory end portion.

5. The work vehicle according to claim 4 , wherein a cross-sectional surface area of the passage at the terminal end portion of the upstream pipe member is smaller than the cross-sectional surface area of the passage further upstream.

6. The work vehicle according to claim 4 , wherein at a portion connecting the pipe members with each other, positioned at the third passage, a terminal end portion of an upstream pipe member is connected to an introductory end portion of the next downstream pipe member in a state where a gap exists in the diameter direction.

7. A work vehicle comprising, under a hood provided to a vehicle body, a cooling fan, an engine, and a diesel particulate filter which purifies exhaust gas from the engine,
the work vehicle being configured such that the exhaust gas from the engine is exhausted through an exhaust passage extending from the diesel particulate filter after passing through the diesel particulate filter, wherein
the cooling fan is placed so as to supply cooling air to the engine, and
the exhaust passage comprises:
a first passage extending toward the cooling fan and upward from the diesel particulate filter before extending above the engine on the cooling fan side from the diesel particulate filter and along the underside of the hood;
a second passage extending to a lateral side of the engine from a downstream portion of the first passage and downward along the underside of the hood; and
a third passage extending in a direction opposite to the cooling fan with respect to the diesel particulate filter from a downstream portion of the second passage and having an exhaust outlet.

8. A work vehicle comprising, under a hood provided to a vehicle body, a cooling fan, an engine, and a diesel particulate filter purifying exhaust gas from the engine,
the work vehicle configured such that the exhaust gas from the engine is exhausted through an exhaust passage extending from the diesel particulate filter after passing through the diesel particulate filter, wherein
the cooling fan is placed so as to supply cooling air to the engine,
the exhaust passage comprises a first passage extending toward the cooling fan and upward from the diesel particulate filter before extending above the engine on the cooling fan side from the diesel particulate filter and along the underside of the hood, and
the first passage comprises a first pipe member on an upstream side and a second pipe member arranged in a downstream direction, wherein
at a portion connecting the first pipe member with the second pipe member, a terminal end portion of the first pipe member is inserted into an introductory end portion of the second pipe member such that a gap exists in the diameter direction.

9. The work vehicle according to claim 8 , wherein an exhaust outlet of the second pipe member is oriented away from a direction of supplied cooling air from the cooling fan.

10. The work vehicle according to claim 9 , wherein the exhaust outlet is arranged below the diesel particulate filter.

11. The work vehicle according to claim 1 , wherein the exhaust outlet discharges exhaust gas away from a direction of supplied cooling air from the cooling fan.

12. The work vehicle according to claim 1 , wherein the exhaust outlet is arranged below the diesel particulate filter.

13. The work vehicle according to claim 1 , wherein the exhaust outlet is arranged below and behind the diesel particulate filter.

14. The work vehicle according to claim 7 , wherein the exhaust outlet discharges exhaust gas away from a direction of supplied cooling air from the cooling fan.

15. The work vehicle according to claim 7 , wherein the exhaust outlet is arranged below the diesel particulate filter.

16. The work vehicle according to claim 7 , wherein the exhaust outlet is arranged below and behind the diesel particulate filter.

Assignees

• Nogami Kazuaki
• Tsuchihashi Hironori
• Shiraga Takahiro
• Sato Eiji
• Minoura Akira
• Komatsu Takafumi
• Kubota Kk

Inventors

• Nogami Kazuaki
• Tsuchihashi Hironori
• Shiraga Takahiro
• Sato Eiji
• Minoura Akira
• Komatsu Takafumi

Classifications

• B60K11/06 Primary

  with air cooling · CPC title

• B60K13/00 Primary

  Arrangement in connection with combustion air intake or gas exhaust of propulsion units · CPC title

• B60K13/04

  concerning exhaust · CPC title

• F01N2590/08

  for heavy duty applications, e.g. trucks, buses, tractors, locomotives · CPC title

• F01N3/021

  by means of filters · CPC title