Engine device

Patent metadata

Field	Value
Publication number	US-9683348-B2
Application number	US-201414773857-A
Country	US
Kind code	B2
Filing date	Mar 13, 2014
Priority date	Mar 15, 2013
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

It is a technical problem to provide an engine device that includes an exhaust gas purification device, which can be efficiently arranged in an engine installation space. The engine is arranged on the lower side of an operating seat, and a flywheel housing is arranged in such a manner as to be positioned on the front portion side of a traveling machine body, and the exhaust gas purification device is arranged on the upper side of the rear of the engine. Also, the engine is coupled with an air cleaner that draws in fresh air on the left side thereof. Furthermore, a hood includes a hood cover configured to be openable/closable in the rear thereof and covers the upper portion of the exhaust gas purification device.

First claim

The invention claimed is:

1. An engine device mounted on a work machine in which an operating seat is arranged on a hood provided in a rear of a travelling machine body, and an engine is arranged in the hood, comprising:
a first purification device that removes particulate matter in the exhaust of the engine, a second purification device that removes nitrogen oxides in the exhaust gas of the engine, and a cooling fan and a radiator all positioned at a rear of the engine and within the hood, the radiator being rearward of and proximate to the cooling fan wherein
the first and second purification devices are positioned behind the operating seat a length of each along which gas flows therein being parallel to the other and oblique with respect to an output shaft of the engine, and
the first purification device is mounted on top of a first support frame positioned above the cooling fan, and the second purification device is mounted on top of a second support frame positioned above the radiator, the second purification device being positioned more toward the rear of the engine than the first purification device, and
wherein the second support frame is positioned higher than the first support frame with respect to the cooling fan, and the second purification device is positioned higher than the first purification device with respect to the cooling fan.

2. The engine device according to claim 1 ,
wherein the first and second purification devices are arranged so that the exhaust gas circulates from the first purification device to the second purification device, and
wherein a reducing agent mixing pipe that connects an exhaust gas outlet pipe of the first purification device to an exhaust gas inlet pipe of the second purification device is provided in such a manner that respective transfer directions of the exhaust gas in the first purification device and the second purification device are identical, and
wherein the reducing agent mixing pipe is configured for the injection of a reducing agent into the reducing agent mixing pipe.

3. The engine device according to claim 1 ,
wherein an exhaust gas inlet side of the first gas purification device is connected to an exhaust manifold of the engine via an exhaust connecting pipe, and wherein
an exhaust temperature increasing mechanism configured to increase a temperature of the exhaust gas leading to the first gas purification device is provided in a midway portion of the exhaust connecting pipe,
and in the engine, an air cleaner is connected to an inlet facing right-and-left inner lateral surface of the hood through an intake pipe extending toward the rear of the engine,
and the air cleaner is positioned away from the first and second gas purifying devices, and toward the rear of the engine.

4. The engine device according to claim 1 ,
wherein the first and second purification devices are arranged so that the exhaust gas circulates from the first purification device to the second purification device, and
wherein a reducing agent mixing pipe that connects an exhaust gas outlet pipe of the first purification device to an exhaust gas inlet pipe of the second purification device is provided in such a manner that respective transfer directions of the exhaust gas in the first purification device and the second purification device are identical, and
wherein the reducing agent mixing pipe is configured for the injection of a reducing agent into the reducing agent mixing pipe.

5. The engine device according to claim 1 , wherein the first and second gas purifying devices together comprise a combined gas purification device which is located on a first side of the engine and wherein the air cleaner is positioned facing a second side of the engine.

6. An engine device mounted on a work machine in which an operating seat is arranged on a hood provided in a rear of a travelling machine body, and an engine is arranged in the hood, comprising:
an exhaust manifold configured to be provided on one right-and-left lateral surface of the engine and configured to include an exhaust gas outlet above; and
an exhaust gas purification device configured to be supported above the exhaust manifold and configured to purify exhaust gas of the engine by coupling an exhaust gas outlet side of the exhaust manifold with an exhaust gas inlet side of the exhaust manifold,
wherein the exhaust gas purification device is arranged parallel to one lateral surface of the engine between a head cover of the engine and one right-and-left inner lateral surface of the hood, and
wherein the work machine comprises a heat exchanger in a rear of the engine facing a cooling fan provided on the engine, the heat exchanger being supported by a support member bridging a left and right side walls of a body frame of the traveling machine body, and
wherein a portion of the exhaust gas purification device is arranged above an upper side of the support member, while an air cleaner is arranged below the upper side of the support member.

7. The engine device according to claim 6 ,
wherein the exhaust gas purification device is supported by support bodies coupled with a cylinder head of the engine, and
wherein the support bodies are a first bracket leg fixed on a side of a cooling fan of the engine and a second bracket leg fixed on a side of a flywheel housing of the engine, and
wherein the second bracket leg supports an upstream side in a transfer direction of the exhaust gas in the exhaust gas purification device, and the first bracket leg supports a downstream side in the transfer direction of the exhaust gas in the exhaust gas purification device, and
wherein the exhaust gas purification device couples with the exhaust manifold at a position between the first bracket leg and the second bracket leg.

8. The engine device according to claim 6 , wherein the exhaust gas purification device is located on a first side of the engine and wherein the air cleaner is positioned facing a second side of the engine.

9. The engine device according to claim 6 , wherein the air cleaner is connected to an inlet facing right-and-left inner lateral surface of the hood through an intake pipe extending toward the rear of the engine, and wherein the air cleaner is positioned away from the first and second gas purifying devices and toward the rear of the engine.

Assignees

• Yanmar Co Ltd

Inventors

• Mitsuda Masataka

Classifications

• F01N3/0205

  using heat exchangers · CPC title

• F01N3/106

  Auxiliary oxidation catalysts · CPC title

• F01N13/009

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

• F01N3/035

  with catalytic reactors · CPC title

• F01N3/28

  Construction of catalytic reactors · CPC title