Work vehicle

Patent metadata

Field	Value
Publication number	US-11946402-B2
Application number	US-202217975942-A
Country	US
Kind code	B2
Filing date	Oct 28, 2022
Priority date	Sep 30, 2021
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

A work vehicle includes: a first exhaust pipe to which engine exhaust is sent; and a second exhaust pipe that has an inlet having an outer diameter larger than an outlet of the first exhaust pipe, the outlet of the first exhaust pipe and the inlet of the second exhaust pipe being disposed in proximity such that the outlet of the first exhaust pipe is positioned inside the inlet of the second exhaust pipe; a partition that divides a cross section of the outlet of the first exhaust pipe into a plurality of divided regions when viewed from the flow direction and partitions the adjacent divided regions at intervals.

First claim

The invention claimed is:

1. A work vehicle comprising:
a first exhaust pipe to which engine exhaust is sent;
a second exhaust pipe that has an inlet having an outer diameter larger than an outer diameter of an outlet of the first exhaust pipe, wherein
the outlet of the first exhaust pipe and the inlet of the second exhaust pipe are disposed in proximity such that the outlet of the first exhaust pipe is positioned inside the inlet of the second exhaust pipe; and

a partition that:
comprises two or more elongated plates, wherein
when viewed from a flow direction of the engine exhaust, the two or more elongated plates either:
intersect each other at a center of the outlet of the first exhaust pipe, or
extend radially outward from the center of the outlet of the first exhaust pipe, and

both end portions of each of the two or more elongated plates are supported by notches on the outlet of the first exhaust pipe, and

divides a cross section of the outlet of the first exhaust pipe into a plurality of divided regions when viewed from the flow direction and partitions the adjacent divided regions at intervals.

2. The work vehicle according to claim 1 , wherein the partition is attached to the outlet of the first exhaust pipe.

3. The work vehicle according to claim 1 , wherein areas of the divided regions are all the same when viewed from the flow direction.

4. The work vehicle according to claim 1 , wherein the partition is line symmetrical with respect to a virtual straight line passing through the center of the outlet of the first exhaust pipe when viewed from the flow direction.

5. The work vehicle according to claim 1 , wherein a cross section of the partition has a wedge shape when viewed from a direction orthogonal to the flow direction, the wedge shape tapering toward an upstream of a flow of the engine exhaust discharged from the outlet of the first exhaust pipe.

6. The work vehicle according to claim 1 , wherein
the notches are V-shaped notches,
each of the two or more elongated plates is folded to have a V-shaped cross section, and
the both end portions of the two or more elongated plates each having the V-shaped cross section are fitted into the V-shaped notches.

7. A work vehicle comprising:
a first exhaust pipe to which engine exhaust is sent;
a second exhaust pipe that has an inlet having an outer diameter larger than an outlet of the first exhaust pipe, wherein
the outlet of the first exhaust pipe and the inlet of the second exhaust pipe are disposed in proximity such that the outlet of the first exhaust pipe is positioned inside the inlet of the second exhaust pipe; and

a partition that comprises two or more elongated plates, wherein
first notches and second notches on the outlet of the first exhaust pipe extend from an end of the outlet of the first exhaust pipe to a direction opposite to the second exhaust pipe, wherein
each of the first notches is larger in size than any of the second notches, and
the first notches support both end portions of each of the two or more elongated plates.

8. The work vehicle according to claim 7 , wherein the first and second notches are line symmetrical with respect to a virtual straight line passing through a center of the outlet of the first exhaust pipe when viewed from a flow direction of the engine exhaust.

9. A work vehicle comprising
a first exhaust pipe to which engine exhaust is sent;
a second exhaust pipe that has an inlet having an outer diameter larger than an outlet of the first exhaust pipe, wherein
the outlet of the first exhaust pipe and the inlet of the second exhaust pipe are disposed in proximity such that the outlet of the first exhaust pipe is positioned inside the inlet of the second exhaust pipe; and

a partition that:
comprises two or more elongated plates, wherein
when viewed from a flow direction of the engine exhaust, the two or more elongated plates either:
intersect each other at a center of the outlet of the first exhaust pipe, or
extend radially outward from the center of the outlet of the first exhaust pipe, and

divides a cross section of the outlet of the first exhaust pipe into a plurality of divided regions when viewed from the flow direction and partitions the adjacent divided regions at intervals, wherein

first notches and second notches on the outlet of the first exhaust pipe extend from an end of the outlet of the first exhaust pipe to a direction opposite to the second exhaust pipe, wherein
each of the first notches is larger in size than any of the second notches, and
the first notches support both end portions of each of the two or more elongated plates.

10. The work vehicle according to claim 9 , wherein
the partition is attached on the first exhaust pipe across a portion of the first exhaust pipe further separated to a direction opposite to the second exhaust pipe than the ends of the notches in the opposite direction, and the end of the outlet of the first exhaust pipe, and
the partition protrudes from the end of the outlet of the first exhaust pipe toward the second exhaust pipe.

11. The work vehicle according to claim 9 , wherein the partition and the first and second notches are line symmetrical with respect to a virtual straight line passing through a center of the outlet of the first exhaust pipe when viewed from the flow direction.

Assignees

• Kubota Kk

Inventors

• Shinya Masaru
• Nishimura Tatsuya

Classifications

• F01N13/082 Primary

  of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation (F01N13/20 takes precedence) · CPC title

• F01N1/084

  the exhaust gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes · CPC title

• F01N2470/24

  Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled · CPC title

• F01N13/1805 Primary

  Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body (pipe joints in general F16L; fixing auxiliaries in motor vehicles in general B60K) · CPC title

• F01N2590/08

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