Reducing agent tank and work vehicle

Patent metadata

Field	Value
Publication number	US-9388725-B2
Application number	US-201414359129-A
Country	US
Kind code	B2
Filing date	Jan 8, 2014
Priority date	Jan 8, 2014
Publication date	Jul 12, 2016
Grant date	Jul 12, 2016

Abstract

A reducing agent tank is provided which enables detachment of a top cover and a heat exchanger while maintaining a long path length of a heat exchanger in a reducing agent tank. A first pipeline and a second pipeline respectively have extension portions which extend from lower ends of a suspended portion along a bottom face toward a side face of a container main body, and rising portions which extend from leading ends of the extension portions along the side face toward an upper face of the container main body. A length of the extension portions along the bottom face is larger than a maximum inside length of an opening. The rising portions and a turning portion form a leading end bent portion, and a rising length of the leading end bent portion is smaller than a minimum inside length passing through a center of the opening.

First claim

The invention claimed is:

1. A reducing agent tank, comprising:
a container main body which has an opening formed in an upper face and stores a reducing agent;
a heat exchanger which performs heat exchange with said reducing agent; and
a top cover which covers said opening and supports said heat exchanger,
said heat exchanger including a first pipeline which guides a heat exchange medium into said container main body, a second pipeline which allows a heat exchange medium to flow out from said container main body, and a turning portion, said first pipeline and said second pipeline communicating with each other through said turning portion,
each of said first pipeline and said second pipeline having a suspended portion which extends from said top cover toward a bottom face of said container main body, an extension portion which extends from a lower end of said suspended portion along said bottom face toward a side face of said container main body, and a rising portion which extends from a leading end of said extension portion along said side face toward said upper face of said container main body,
a length of each said extension portion along said bottom face being larger than a maximum inside length passing through a center of said opening,
said rising portion of said first pipeline, said rising portion of said second pipeline, and said turning portion forming a leading end bent portion of said heat exchanger,
a rising length of said leading end bent portion along said side face being smaller than a minimum inside length passing through a center of said opening.

2. The reducing agent tank according to claim 1 , wherein a shape of said leading end bent portion viewed from an extending direction of said extension portion is included in a planar shape of said opening.

3. The reducing agent tank according to claim 2 , wherein a circumscribed circle of a shape of said leading end bent portion viewed from an extending direction of said extension portion is included in a planar shape of said opening.

4. The reducing agent tank according to claim 1 , wherein a distance between said leading end bent portion and said side face is smaller than a length obtained by bisecting a minimum distance between an edge of said opening and said side face.

5. The reducing agent tank according to claim 1 , wherein said opening is circular.

6. The reducing agent tank according to claim 1 , wherein said first pipeline and said second pipeline extend from said top cover to said turning portion while maintaining a sum of an outer diameter of said first pipeline, an outer diameter of said second pipeline, and a distance between said first pipeline and said second pipeline to be smaller than a minimum inside length passing through a center of said opening.

7. A work vehicle, comprising:
an engine;
an exhaust gas treatment device which performs treatment with a reductive reaction to an exhaust gas from said engine;
the reducing agent tank according to claim 1 ; and
a reducing agent injection device which injects said reducing agent sucked out from said reducing agent tank to said exhaust gas guided to said exhaust gas treatment device.

8. The reducing agent tank according to claim 2 , wherein a distance between said leading end bent portion and said side face is smaller than a length obtained by bisecting a minimum distance between an edge of said opening and said side face.

9. The reducing agent tank according to claim 3 , wherein a distance between said leading end bent portion and said side face is smaller than a length obtained by bisecting a minimum distance between an edge of said opening and said side face.

10. The reducing agent tank according to claim 2 , wherein said opening is circular.

11. The reducing agent tank according to claim 3 , wherein said opening is circular.

12. The reducing agent tank according to claim 4 , wherein said opening is circular.

13. The reducing agent tank according to claim 2 , wherein said first pipeline and said second pipeline extend from said top cover to said turning portion while maintaining a sum of an outer diameter of said first pipeline, an outer diameter of said second pipeline, and a distance between said first pipeline and said second pipeline to be smaller than a minimum inside length passing through a center of said opening.

14. The reducing agent tank according to claim 3 , wherein said first pipeline and said second pipeline extend from said top cover to said turning portion while maintaining a sum of an outer diameter of said first pipeline, an outer diameter of said second pipeline, and a distance between said first pipeline and said second pipeline to be smaller than a minimum inside length passing through a center of said opening.

15. The reducing agent tank according to claim 4 , wherein said first pipeline and said second pipeline extend from said top cover to said turning portion while maintaining a sum of an outer diameter of said first pipeline, an outer diameter of said second pipeline, and a distance between said first pipeline and said second pipeline to be smaller than a minimum inside length passing through a center of said opening.

16. The reducing agent tank according to claim 5 , wherein said first pipeline and said second pipeline extend from said top cover to said turning portion while maintaining a sum of an outer diameter of said first pipeline, an outer diameter of said second pipeline, and a distance between said first pipeline and said second pipeline to be smaller than a minimum inside length passing through a center of said opening.

Assignees

• Komatsu Mfg Co Ltd

Inventors

• Ogawa Satoshi
• Kusaba Taisuke
• Kuse Yasutaka

Classifications

• F01N2610/107

  using glow plug heating elements · CPC title

• B01D53/9477

  with catalysts positioned on separate bricks, e.g. exhaust systems · CPC title

• B01D53/9431

  Processes characterised by a specific device · CPC title

• F01N3/2066 Primary

  Selective catalytic reduction [SCR] · CPC title

• B01D53/90

  Injecting reactants · CPC title