KR20140026828A - Fixing structure of exhaust gas after treatment device - Google Patents

Abstract

The present invention relates to a structure for fixing an exhaust gas post-treatment device of an agricultural vehicle and provides the structure for fixing the exhaust gas post-treatment device of the agricultural vehicle capable of stably maintaining the performance of the exhaust gas post-treatment device by stably supporting the exhaust gas post-treatment device to endure the vibration of an engine. The structure fixing the exhaust gas post-treatment device purifying the exhaust gas of the engine of the agricultural vehicle to the engine fixates the exhaust gas post-treatment device with a strip-shaped fixing band while the exhaust gas post-treatment device is supported by two brackets. The two brackets are contiguously fixed on a cylinder head while being arranged on the upper part of an exhaust manifold to be parallel along the longitudinal direction of the engine. An exhaust gas inlet formed on one side of the exhaust gas post-treatment device is extended to the lower side perpendicular to the exhaust gas post-treatment device and connected to the exhaust manifold of the engine. A part of the exhaust gas inlet is formed into a flexible pipe for absorbing vibration.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas post-

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to an exhaust gas post-treatment device mounting structure of an agricultural working vehicle.

Most of the agricultural work vehicles represented by tractors will receive driving power and work power through the diesel engine.

Such a diesel engine is a reciprocating internal combustion engine that is operated by compression or ignition of light oil or heavy oil as a fuel and is excellent in durability. On the other hand, nitrogen oxide (NOx), which has a serious influence on air pollution, And PM (Particulate Matter) are severely discharged.

In order to meet the Tier 4 level environmental regulations, which are being implemented in advanced countries such as Europe and North America, technically, the fuel injection period is delayed and the exhaust gas recirculation system To reduce the concentration of nitrogen oxides and to improve the combustion performance of the engine in order to reduce particulate matter.

Diesel oxidation catalyst (DOC) and diesel particulate filter (DPF) are used as an exhaust gas post-treatment device of a diesel engine for minimizing the pollutants of exhaust gas and preserving the atmospheric environment. (Hereinafter referred to as " DPF ") is widely used and used in the art (see Korean Patent Publication No. 2012-0052510).

Fig. 1 shows an internal structure of an engine room to which an exhaust gas after-treatment apparatus of a conventional agricultural working vehicle is attached, and Fig. 2 shows the inside of the engine room of Fig. 1 from the rear side of the vehicle body.

As shown in Figs. 1 and 2, the engine room 10 of the tractor as the agricultural working vehicle is constructed such that the inner engine 12 is protected by the upper openable bonnet, The power generated by the engine 12 is transmitted to a transmission (not shown) via the flywheel housing 13 on the rear side of the engine 12 and is supplied to an exhaust gas after- Is mounted in the engine room 10. The exhaust gas after-treatment apparatus 20 is provided with an exhaust gas inlet 210 on one side and directly connected to the turbocharger 15 side of the engine 12 and connected to a muffler pipe (not shown) A purge gas outlet 22 is provided. The exhaust gas after-treatment apparatus 20 is disposed parallel to the longitudinal direction of the engine 12 above the exhaust manifold 14 of the engine 12 and includes a turbocharger 15 disposed below the exhaust gas inlet 21. [ And the exhaust gas inlet 21 is coupled through the turbocharger 15 and the flange tube 16. [

According to the above configuration, when the engine 12 is driven, the exhaust gas is discharged to the exhaust manifold 14 and then flows into the turbocharger 15 installed on the exhaust manifold 14 side to drive the turbine. The exhaust gas is then supplied to the exhaust gas inlet 21 of the exhaust gas aftertreatment device 20 through the flange pipe 16 connected to the turbocharger 15. The exhaust gas supplied into the exhaust gas after-treatment unit 20 through the exhaust gas inlet 21 is purified through a diesel oxidation catalyst (DOC) and a particulate filter (DPF) ). ≪ / RTI >

Meanwhile, the exhaust gas purification of the diesel engine mainly includes nitrogen oxide (NOx) and particulate matter (PM, various particulate harmful substances including soot) Or adsorbed by the DPF.

Particularly, the DPF collects the particulate matter discharged from the diesel engine with a filter, and burns (regenerates) the particulate matter. The particulate matter is collected and used again, and the particulate matter can be reduced by 80% Is known as an excellent exhaust gas aftertreatment device.

However, the exhaust gas aftertreatment apparatus in which the DOC and the DPF are combined has a disadvantage in that it is bulky and heavy, which makes it difficult to mount it on a conventional agricultural work vehicle.

Particularly, such an exhaust gas after-treatment apparatus is required to have an exhaust temperature higher than a predetermined temperature in order to obtain a reliable burning agent or sufficient catalytic activity of particulate matter, and therefore, there is a problem that it is structurally limited to be installed at a position as close as possible to the engine .

Therefore, it is inevitable to install such an exhaust gas after-treatment apparatus in the engine room. However, the conventional engine room structure of the agricultural work vehicle is very narrow and it has been difficult to secure the installation space.

In addition, since most agricultural working vehicles are equipped with a high-horsepower engine, driving vibration is severely generated. In this case, if the fixing means for firmly supporting the exhaust gas after-treatment apparatus is not provided, the exhaust gas after- Damage to the purifying function may be caused. In severe cases, the exhaust gas aftertreatment device may deviate from the fixed position during traveling and collide with the surrounding structure, particularly, the engine, thereby causing serious malfunction and accident.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an exhaust gas aftertreatment apparatus which is disposed in parallel with a longitudinal direction of an engine at an upper portion of an exhaust manifold of an engine, Through two fixed brackets adjoining to each other and fixed on two fixed bands having a semicircular strip shape, and an exhaust gas inlet provided at one side of the exhaust gas post-treatment device is fixed to the exhaust gas after- And a part of the exhaust gas inlet is formed in the form of a flexible pipe so that the exhaust gas after-treatment apparatus can be reliably and reliably prevented from vibrating shock of the engine And the exhaust of the agricultural working vehicle which can stably maintain the performance of the exhaust gas post-treatment apparatus And a mounting structure of the post-processing apparatus.

According to an aspect of the present invention, there is provided a structure for mounting an exhaust gas post-treatment device for purifying engine exhaust gas of an agricultural working vehicle to an engine, the exhaust gas post- Shaped fixing band in a state of being supported via two brackets fixed adjacent to each other on a cylinder head in a state of being arranged parallel to the longitudinal direction of the engine in the longitudinal direction of the engine, And the exhaust gas inlet port is connected to the exhaust manifold of the engine so as to extend in a downward direction perpendicular to the exhaust gas post-treatment apparatus, and a part of the exhaust gas inlet is formed in the form of a flexible pipe .

Wherein the fixing band includes a lower side fixing band in the shape of a semicircular band surrounding the lower side cylindrical surface of the exhaust gas aftertreatment device and a semicircular band surrounding the upper side cylindrical surface of the exhaust gas aftertreatment device and engaged with the lower side fixing band Shaped upper side fixing band.

The bracket for fixing the exhaust gas aftertreatment device includes a first bracket fixed to a side wall of the cylinder head and supporting the exhaust gas aftertreatment device, and a second bracket fixed to an upper end of the cylinder head, And a second bracket coupled to one side of the first bracket.

At this time, the first bracket includes a vertical plate portion fixed to a wall surface of a lower side of a front side of the cylinder head; A horizontal plate formed by vertically bending the upper end of the vertical plate; A support for connecting and supporting the vertical plate and the horizontal plate; And a plurality of supporting pieces provided on the upper surface of the horizontal plate at a predetermined interval along the longitudinal direction thereof and having the lower side fixing band fixedly attached to a curved surface of an arc shape formed at an upper end thereof.

The second bracket may include a horizontal fixing part fixed to an upper end of the cylinder head; And the vertical fixing part is vertically bent on one side of the horizontal fixing part. The vertical fixing part may be bolted to the vertical plate part of the first bracket while being in contact with each other.

According to the present invention, the exhaust gas after-treatment apparatus is disposed above the exhaust manifold of the engine in parallel along the longitudinal direction of the engine and is supported on the cylinder head through two brackets fixed adjacent to each other, It is possible to fix the exhaust gas after-treatment apparatus with a simple and solid structure through the use of the fixed bands.

Further, the exhaust gas inlet provided at one side of the exhaust gas post-treatment device is extended toward the lower side perpendicular to the exhaust gas post-treatment device and connected to the exhaust manifold of the engine, and a part of the exhaust gas inlet is connected to a flexible tube flexible pipe, the vibration transmitted from the engine can be effectively absorbed by the flexible tube portion. Therefore, it is possible to stably support the exhaust gas after-treatment apparatus from the vibration of the engine and to improve the performance of the exhaust gas after- Can be stably maintained.

Further, according to the present invention, when the fixing band surrounding the exhaust gas after-treatment apparatus is separated and the connecting portion between the exhaust manifold and the exhaust gas inlet is separated, the exhaust gas after-treatment apparatus can be easily detached from the engine There are advantages.

1 is a front view showing an internal structure of an engine room to which an exhaust gas after-treatment apparatus of a conventional agricultural working vehicle is attached.
Fig. 2 is a side view of the interior of the engine compartment of Fig. 1 viewed from the rear side of the vehicle body. Fig.
3 is a perspective view showing an exhaust gas post-treatment apparatus mounting structure of an agricultural working vehicle according to an embodiment of the present invention;
Fig. 4 is a front view of Fig. 3 viewed in the YZ plane direction; Fig.
Fig. 5 is a side view of Fig. 3 taken along the XZ plane. Fig.
Fig. 6 is a perspective view of Fig. 3 as seen from the front side of the engine. Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view showing an exhaust gas post-treatment apparatus mounting structure of an agricultural working vehicle according to an embodiment of the present invention. FIG. 4 is a front view of FIG. 3 viewed in the direction of the Y-Z plane, and FIG. 5 is a side view of the view of FIG. 3 in the direction of the X-Z plane. Fig. 6 is a perspective view of Fig. 3 viewed from the front side of the engine.

3 to 6, an exhaust gas post-treatment apparatus 200 according to the present invention is mounted inside an engine room (not shown) of a tractor and includes carbon monoxide (CO) and hydrocarbons (HC A diesel particulate filter (hereinafter referred to as DOC) 210 for removing particulate matter (PM) contained in the exhaust gas and a diesel particulate filter And a DPF (Diesel Particulate Filter) 220 (hereinafter, referred to as DPF).

The exhaust gas after-treatment apparatus 200 is arranged in parallel along the longitudinal direction (Y-axis direction) of the engine 120 at a top side spaced a certain distance from the exhaust manifold 140 of the engine 120, And is fixed using two fixing bands 270 and 280 having a semicircular strip shape while being supported by two brackets 250 and 260 fixed on a cylinder head 160 located on the side of the cylinder head 160. [

The exhaust gas aftertreatment apparatus 200 includes an exhaust gas inlet 212 through which exhaust gas flows into one side of the DOC 210 and an exhaust gas inlet 212 through which the DOC 210 and the DPF 220 are connected to one side of the DPF 220. And a purge gas outlet 222 through which the purified gas passes.

The exhaust gas inlet 212 provided in the DOC 210 extends vertically downward from the exhaust gas after-treatment apparatus 200 and is connected to the exhaust manifold 140 of the engine 120, .

At this time, a flexible pipe having a corrugated shape is provided on a part of the exhaust gas inlet 212 so as to effectively block the engine vibration transmitted to the exhaust gas after-treatment apparatus 200 via the exhaust manifold 140 214 are installed.

The fixing bands 270 and 280 include a lower side fixing band 270 having a semicircular strip shape surrounding the lower side cylindrical surface of the exhaust gas aftertreatment device 200, And an upper side fixing band 280 having a semicircular band shape surrounding the upper side cylindrical surface of the upper side fixing band 280.

The exhaust gas post-treatment apparatus 200 is mounted on the lower side fixing band 270 and then is wound around the lower side fixing band 270 and the upper side fixing band 280 280 are fixed to each other by bolts.

In addition, two brackets 250 and 260 for fixing the exhaust gas after-treatment device 200 are fixed to the side wall of the cylinder head 160 to support the exhaust gas after-treatment device 200. A first bracket 250 and a second bracket 260 fixed to the upper end of the cylinder head 160 and abutting with one side surface of the first bracket 250 are provided.

5, the first bracket 250 has a substantially U-shaped cross-section as viewed from the rear side of the engine 120. The first bracket 250 is disposed in front of the cylinder head 160, A horizontal plate 252 vertically bent from the upper end of the vertical plate 251 and a vertical plate 252 connected between the vertical plate 251 and the horizontal plate 252, A plurality of supporting pieces 253 supporting a bottom portion of the exhaust gas aftertreatment device 200 at a plurality of spaced apart intervals along the longitudinal direction on the upper surface of the horizontal plate portion 252, 254). 4, the left side is the front side of the engine 120, and the right side is the rear side of the engine 120. As shown in FIG.

The support piece 254 is vertically erected and fixed to the upper surface of the horizontal plate 252. The support piece 254 is fixed to the upper surface of the support piece 254 by a circular arc so as to surround and support the cylindrical outer surface of the exhaust gas post- And the lower side fixing band 270 is attached and fixed to the curved surface of the arc shape.

5, the second bracket 260 has a cross-sectional shape as viewed from the rear side of the engine 120 (see FIG. 5) And a vertical fixing part 262 bent perpendicularly to one side of the horizontal fixing part 261. The horizontal fixing part 261 is fixed to the horizontal fixing part 261, At this time, the vertical fixing part 262 of the second bracket 260 is fastened and fixed to the vertical plate part 251 of the first bracket 250 through the bolts.

According to such a configuration, when the exhaust gas post-treatment apparatus 200 is fixed to the engine 120, the exhaust gas is introduced into the lower fixing band 270 attached to the support piece 254 of the first bracket 250, After the post-treatment apparatus 200 is mounted, the upper side of the exhaust gas after-treatment apparatus 200 is covered with the upper side fixing band 280, and the lower side fixing band 270 and the upper side fixing band 280 The exhaust gas aftertreatment device 200 can be firmly fixed to the upper end of the first bracket 250 by a simple process of fastening both side portions contacting each other with bolts.

Meanwhile, as described above, the exhaust gas inlet 212 provided at one side of the exhaust gas post-treatment apparatus 200 is disposed so as to face the lower side perpendicular to the exhaust gas post-treatment apparatus 200, And is connected to the exhaust manifold 140 of the engine 120 located in the exhaust manifold 140 in a vertically detachable manner.

At this time, a flexible tube 214 having a corrugated shape is formed at a portion of the exhaust gas inlet 212, and the exhaust gas is introduced into the exhaust gas after-treatment unit 200 through the exhaust manifold 140, Can be effectively blocked by the portion of the flexible tube (214).

The upper side fixing band 280 surrounding the exhaust gas after-treatment apparatus 200 may be separated from the lower side fixing band 270 and the exhaust gas inlet port The exhaust gas after-treatment apparatus 200 can be easily separated from the engine 120. [

The operation mechanism of the exhaust gas after-treatment apparatus 200 of the present invention having such a structure will be described below. The exhaust gas discharged when the engine 120 is driven flows into the turbocharger 150 connected to the exhaust manifold 140 side The exhaust gas is introduced into the exhaust gas after-treatment device 200 through the exhaust gas inlet 212 of the DOC 210 connected to the turbocharger 150, . The exhaust gas supplied into the exhaust gas after-treatment apparatus 200 is purified through the DOC 210 and the DPF 220, and is finally exhausted to the atmosphere through the purge gas outlet 222.

As described above, according to the present invention, after the exhaust gas after-treatment apparatus 200 is supported on the cylinder head 160 of the engine 120 through two brackets 250 and 260 fixed adjacent to each other, It can be fixed with a simple and rigid structure by using two fixing bands 270 and 280 having a shape. The exhaust gas inlet 212 provided at one side of the exhaust gas post-treatment apparatus 200 is extended toward the lower side perpendicular to the exhaust gas post-treatment apparatus 200, The vibration transmitted from the engine 120 is absorbed through the flexible tube 214 via the flexible tube 214 to a part of the exhaust gas inlet 212 and the exhaust gas after- It is possible to effectively prevent the vibration of the apparatus 200 from being transmitted to the apparatus 200, so that the performance of the exhaust gas post-treatment apparatus 200 can be stably maintained.

In addition, the present invention can also be used to separate the fixing band 270 (280) surrounding the exhaust after-treatment device (200) when necessary and to separate the connection portion between the exhaust manifold (140) and the exhaust gas inlet The exhaust gas aftertreatment apparatus 200 can be easily attached to and detached from the engine 120.

120: engine 130: flywheel housing
140: exhaust manifold 160: cylinder head
200: Exhaust gas post-treatment device 210: Diesel oxidation catalyst (DOC)
212: exhaust gas inlet 214: flexible tube
220: Diesel Particulate Filter (DPF) 222: Purge gas outlet
250: first bracket 251: vertical plate
252: horizontal plate 253:
254: Support piece 260: Second bracket
261: horizontal fixing part 262: vertical fixing part
270,280: Fixed band

Claims (5)

A structure for mounting an exhaust gas post-treatment device for purifying engine exhaust gas of an agricultural working vehicle to an engine,
The exhaust gas aftertreatment device is provided with a band-shaped fixing band in a state in which it is supported through two brackets fixed adjacent to each other on a cylinder head in a state in which the engine exhaust manifold is disposed in parallel in the longitudinal direction of the engine. Is fixed through, the exhaust gas inlet provided on one side of the exhaust gas aftertreatment is extended toward the lower side perpendicular to the exhaust gas aftertreatment device is connected to the exhaust manifold of the engine, a portion of the exhaust gas inlet Mounting structure for exhaust gas aftertreatment of agricultural work vehicle, which is applied in the form of flexible pipe for absorbing vibration
The antenna according to claim 1,
A semicircular belt-shaped lower side fixing band surrounding the lower side cylindrical surface of the exhaust gas aftertreatment apparatus; And
A semicircular belt-like upper side fixing band surrounding the upper side cylindrical surface of the exhaust gas after-treatment apparatus and engaged with the lower side fixing band;
Exhaust gas aftertreatment device mounting structure for agricultural work vehicle, characterized in that configured to include
The method of claim 2, wherein the two brackets,
A first bracket fixed to the side wall of the cylinder head and supporting the exhaust gas aftertreatment device;
A second bracket fixed to an upper end of the cylinder head and coupled to one side surface of the first bracket;
Exhaust gas post-treatment device mounting structure for agricultural work vehicle, characterized in that configured to include
The method of claim 3, wherein the first bracket,
A vertical plate portion fixed to a front side lower side wall surface of the cylinder head;
A horizontal plate formed by vertically bending the upper end of the vertical plate;
A support for connecting and supporting the vertical plate and the horizontal plate;
A plurality of support pieces are provided on the upper surface of the horizontal plate portion along the longitudinal direction at regular intervals, the lower fixing band is attached to the arc-shaped curved surface formed on the upper end;
Exhaust gas post-treatment device mounting structure for agricultural work vehicle, characterized in that configured to include
The method of claim 4, wherein the second bracket,
A horizontal fixing part fixed to an upper end of the cylinder head;
It is made, including; a vertical fixing formed bent vertically on one side of the horizontal fixing,
The vertical fixing part mounting structure of the exhaust gas aftertreatment device of an agricultural work vehicle, characterized in that the bolt is fastened in a state in which the vertical plate portion of the first bracket abuts each other.

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