JP2010180860A - Working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working vehicle facilitating maintenance of an exhaust emission control device. <P>SOLUTION: The working vehicle includes, inside a hood 5, an engine 20 and a hydraulic pump 22 connected to an output shaft of the engine 20. In the working vehicle, the exhaust emission control device 30 is connected to an exhaust manifold 28 of the engine 20 and the exhaust emission control device 30 is arranged above at least any one of a flywheel case 21 of the engine 20 and the hydraulic pump 22 and is constructed to be fitted within widths in longitudinal, lateral and vertical directions of the engine 20 or an engine support member 29 supporting the engine 20 from beneath. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for a work vehicle including an exhaust purification device.

  Particulate matter is contained in exhaust gas discharged from a turning work vehicle such as a power shovel (hereinafter referred to as “work vehicle”) or a diesel engine (hereinafter referred to as “engine”) mounted on an automobile or the like. . Conventionally, in order to collect the particulate matter, an exhaust gas purification apparatus equipped with a DPF (Diesel Particulate Filter) is used. In order to burn and remove the particulate matter collected and deposited by the DPF, the exhaust gas of the engine is used. In the exhaust emission control device provided in this path, a technique is known in which an oxidation catalyst is provided upstream of the DPF.

  For example, the combustion removal of the particulate matter is performed by performing post-injection after main injection in the combustion stroke of the engine, oxidizing the fuel injected thereafter with an oxidation catalyst, and burning the particulate matter by the reaction heat. . Therefore, when the temperature of the exhaust gas passing through the DPF is low, it is necessary to post-inject more fuel, so the exhaust purification device is disposed at a position where the exhaust gas temperature is high, that is, in the vicinity of the engine ( For example, see Patent Literature 1 and Patent Literature 2).

  However, when the techniques according to Patent Document 1 and Patent Document 2 described above are applied to a work vehicle, the arrangement configuration in the vicinity of the engine of the work vehicle does not sufficiently consider the maintenance of the exhaust purification device. In other words, in a work vehicle to which the technology according to Patent Document 1 is applied, the exhaust purification device is disposed behind the horizontally installed engine and horizontally (in the direction along the engine) in plan view. Therefore, when performing maintenance of the exhaust purification device, the exhaust purification device is not installed from the side where maintenance is easy to perform (the rear side of the work vehicle) but from the side where maintenance is difficult to perform (the side of the work vehicle). Since it is necessary to remove or attach the DPF, it is difficult to maintain the exhaust emission control device.

  Further, in a work vehicle to which the technology according to Patent Document 2 is applied, the exhaust purification device is arranged vertically (in the direction along the exhaust pipe) in a plan view above the exhaust pipe arranged in the front-rear direction. A radiator is attached to the back of the radiator. Therefore, when performing maintenance on the exhaust purification device, it is necessary to open the bonnet and remove or install the DPF of the exhaust purification device while avoiding the radiator. It was difficult.

JP 2006-70878 A JP 2008-184107 A

  The present invention has been made in view of the above-described problems, and a problem to be solved is to provide a work vehicle capable of facilitating maintenance of an exhaust purification device.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, according to claim 1, in a work vehicle including an engine and a hydraulic pump coupled to an output shaft of the engine inside a bonnet, an exhaust purification device is connected to an exhaust manifold of the engine, and the exhaust purification is performed. The device is arranged above the flywheel case of the engine or at least one of the hydraulic pumps, and is configured to fit within the front, rear, left, right, up and down direction width of the engine or an engine support member that supports the engine. It is.

  According to a second aspect of the present invention, the exhaust purification device is housed in a cylindrical cover, and an outlet provided at one end of the cover is disposed toward a maintenance side where a fuel injection pump and a fuel filter of the engine are disposed. It is what is done.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect of the present invention, the exhaust purification device can be easily maintained.

  According to the second aspect of the present invention, the exhaust purification device can be easily maintained.

The side view which shows the whole structure of the power shovel which concerns on one Embodiment of this invention. The plane schematic diagram which shows the structure inside a bonnet. The rear schematic diagram which shows the structure inside a bonnet. FIG. 3 is a schematic cross-sectional view in the direction of arrows AA inside the bonnet shown in FIG. 2. The perspective view which shows an engine support member. The perspective view which shows the exhaust emission control device cover which accommodates an exhaust emission purification device.

Next, embodiments of the invention will be described.
In the following, the front and rear directions are defined with the direction indicated by the arrow F in the figure as the front. Further, a direction perpendicular to the front-rear direction and the horizontal direction is defined as a left-right direction.

  First, an overall configuration of a power shovel 1 that is an embodiment of a work vehicle according to the present invention will be described. The work vehicle is not limited to the power shovel 1, and may be other agricultural work vehicles, civil work work vehicles, or the like.

  As shown in FIG. 1, the power shovel 1 mainly includes a crawler type traveling device 2, a main body frame 3, an operation unit 4, a work machine 6, a blade 7, and an engine 20.

  The crawler type traveling device 2 is a traveling device for traveling the power shovel 1. The main body frame 3 is a member that forms the base of the excavator 1, and the operation unit 4 and the work implement 6 that constitute the excavator 1 are attached to the main body frame 3. The main body frame 3 is mounted on the crawler type traveling device 2 so as to be able to turn left and right.

  The operation unit 4 is disposed on the upper part of the main body frame 3 and includes various operation levers, foot pedals, and the like. The bonnet 5 is provided in a circular arc shape in plan view at the rear part of the main body frame 3, and mainly houses and covers the engine 20, the hydraulic pump 22, the hydraulic oil tank 23, the radiator 25, and the exhaust purification device 30. To do. A seat 5 a is disposed near the front upper portion of the bonnet 5. A step portion 3 a is formed on the upper surface of the main body frame 3.

  The work implement 6 is provided at the front end portion of the main body frame 3, and mainly includes a boom 6a, an arm 6b, a bucket 6c, a boom cylinder 6d, an arm cylinder 6e, and a bucket cylinder 6f. A boom bracket 6g is pivotally supported at the front end portion of the main body frame 3 so as to be turnable left and right. One end of the boom 6a is pivotally supported by the front end of the boom bracket 6g. One end of the arm 6b is pivotally supported by the other end of the boom 6a. One end of the bucket 6c is pivotally supported by the other end of the arm 6b. The work implement 6 is configured such that the boom 6a can be turned up and down by the boom cylinder 6d, the arm 6b can be turned up and down by the arm cylinder 6e, and the bucket 6c can be turned up and down by the bucket cylinder 6f. The blade 7 protrudes from the rear end portion of the crawler type traveling device 2 and is supported by a lift cylinder (not shown) so as to be vertically rotatable.

  As shown in FIGS. 2 and 3, the engine 20 is disposed inside the hood 5 at the center of the rear portion of the main body frame 3 via an engine support member 29 described later. A flywheel is attached to the left side of the engine 20. The flywheel is housed in a flywheel case 21. An exhaust manifold 28 is provided at the upper part of the engine 20, and an exhaust pipe 20 a for exhausting exhaust gas is connected to the exhaust manifold 28. A fuel injection pump 26 and a fuel filter 27 are disposed at the rear of the engine 20, and a cooling fan 37 is attached to the right side of the engine 20.

Next, the internal configuration of the bonnet 5 other than the engine 20 will be described in detail.
The bonnet 5 mainly houses and covers the engine support member 29, the hydraulic pump 22, the hydraulic oil tank 23, the radiator 25, and the exhaust purification device 30.

As shown in FIG. 5, the engine support member 29 mainly includes a front support member 29a that supports the front side of the engine 20, a rear support member 29b that supports the rear side of the engine 20, and a connecting member 29c. The
The front support member 29a is a plate-like member, and is extended in the left-right direction so that the upper surface that supports the engine 20 is substantially horizontal. The rear support member 29b is formed as a substantially rectangular frame body by combining a plate-like member and a rod-like member, and is located behind the front support member 29a and front and rear so as to open in the front-rear direction. They are arranged substantially in parallel with a predetermined interval in the direction.
The front support member 29 a and the rear support member 29 b are connected by a pair of left and right connecting members 29 c and are disposed inside the bonnet 5. A vibration isolating member 29d is attached to the front supporting member 29a and the rear supporting member 29b, and the engine 20 is attached to the front supporting member 29a and the rear supporting member 29b (that is, the engine supporting member 29) via the vibration isolating member 29d. It is attached.

  The hydraulic pump 22 is provided on the flywheel case 21 side of the engine 20 (on the left side of the engine 20). The hydraulic pump 22 is connected to the output shaft of the engine 20 and is driven by this output shaft.

  The hydraulic oil tank 23 is a tank that stores hydraulic oil for hydraulic equipment, and is provided on the rear left side of the main body frame 3 (left side of the engine 20). A hydraulic hose 24 is connected to the lower side surface of the hydraulic oil tank 23. The hydraulic oil in the hydraulic oil tank 23 is supplied to the hydraulic pump 22 through the hydraulic hose 24.

  The radiator 25 is a device for dissipating (cooling) excessive heat generated in the engine 20. The radiator 25 is disposed on the right side of the cooling fan 37 (on the right side of the engine 20), and is disposed at a predetermined interval from the side wall of the bonnet 5. A duct 3c is provided between the radiator 25 and an opening formed in the side wall of the bonnet 5, and cooling air from the cooling fan 37 can be discharged from the duct 3c to the outside. The duct 3c is provided with a louver 3b, and the direction of the cooling air discharged from the cooling fan 37 can be changed.

  The exhaust purification device 30 is a device that removes particulate matter contained in the exhaust gas of the engine 20. The exhaust purification device 30 is housed inside an exhaust purification device cover 40 that is formed of a hexagonal cylindrical member when viewed from the back.

  The rear part of the bonnet 5 can be rotated upward with its upper end as a fulcrum, and is configured to be held by a stopper or the like (not shown) and rotated upward (see FIG. 1). . Therefore, in this embodiment, since the maintenance inside the hood 5 can be performed from the rear side of the excavator 1, the rear side is the “maintenance side”. Inside the bonnet 5, on the maintenance side, for example, a fuel injection pump 26 provided in the engine 20, a fuel filter 27, an oil filter, an oil gauge, a reservoir tank for cooling water and the like that require periodic maintenance are arranged. Is done.

Next, the arrangement configuration of the exhaust purification device 30 will be described.
As described above, in the present embodiment, the exhaust purification device 30 is accommodated in the exhaust purification device cover 40 and disposed in the bonnet 5.

  The exhaust purification device 30 is disposed above at least one of the flywheel case 21 and the hydraulic pump 22. In the present embodiment, the exhaust purification device 30 is disposed across the flywheel case 21 and the hydraulic pump 22 provided on the left side of the flywheel case 21. Specifically, a mounting portion provided on the side (left side) of the cylinder head 20b disposed on the upper portion of the engine 20 and obliquely above the flywheel case 21 so as to protrude from the inside of the exhaust purification device cover 40. 44 (see FIG. 6).

Further, the exhaust purification device 30 is disposed so as to fit within the front, rear, left, and right and top widths of the engine 20 or the engine support member 29.
In the present embodiment, as shown in FIGS. 4 and 5, the width of the exhaust purification device 30 in the front-rear direction is within the width of the engine support member 29 in the front-rear direction. Specifically, the width in the front-rear direction of the exhaust emission control device 30 (indicated by reference symbol X2) is the width from the front end of the front support member 29a that forms the engine support member 29 to the rear end of the rear support member 29b (indicated by reference symbol X1). Fits in.

  As shown in FIGS. 3 and 5, the width in the left-right direction of the exhaust purification device 30 is within the width in the left-right direction of the engine support member 29. Specifically, the width (Y2 in the figure) of the exhaust purification device 30 in the left-right direction is that of the front support member 29a and the rear support member 29b that form the engine support member 29. It fits within the width (indicated by Y1 in the figure) up to both ends.

  Further, as shown in FIGS. 4 and 5, the vertical width of the exhaust purification device 30 is within the vertical width of the engine support member 29. Specifically, the vertical width (indicated by reference numeral Z2) of the exhaust purification device 30 is long in the vertical direction among the front support member 29a and the rear support member 29b forming the engine support member 29, and is substantially rectangular rear support. The rear support member 29b formed in the frame of the member 29b fits in a width (indicated by reference symbol Z1) from the lower end to the upper end.

  In the present embodiment, the exhaust purification device 30 is accommodated within the front / rear / left / right / upper / lower widths of the engine support member 29 as described above, but depending on the shape of the engine support member 29, the front / rear / left / right of the engine 20・ It should be within the width of each direction.

  Further, the exhaust purification device 30 is connected to the exhaust manifold 28 of the engine 20. In the present embodiment, the exhaust purification device 30 and the exhaust manifold 28 of the engine 20 are connected in communication via an inlet pipe 34 and an exhaust pipe 20a. One end of the inlet pipe 34 is connected to the inlet portion 32 of the exhaust purification device 30 facing the outside from the opening 47 (see FIG. 6) of the exhaust purification device cover 40. The other end of the inlet pipe 34 is connected to one end of the exhaust pipe 20a. The other end of the exhaust pipe 20a is connected in communication with the exhaust manifold 28 of the engine 20.

With the configuration as described above, in the excavator 1, the space above the flywheel case 21 and the hydraulic pump 22 is effectively utilized and used, and the exhaust purification device 30 is compactly located near the engine 20 inside the hood 5. It becomes possible to arrange.
Further, since the exhaust purification device 30 is housed within the front, rear, left, and right direction widths of the engine 20 or the engine support member 29, the bonnet 5 is partially configured so that it does not interfere with other devices. It is possible to install the exhaust emission control device 30 without changing the design of the parts 20 and the parts in the vicinity thereof or changing the arrangement of other devices in order to secure the installation space. As a result, the engine 20 Maintenance of the exhaust emission control device can be easily performed without being disturbed by other devices.
Further, since the exhaust purification device 30 is disposed in the vicinity of the exhaust manifold 28 of the engine 20 and the lengths of the exhaust pipe 20a and the inlet pipe 34 can be shortened, the exhaust gas discharged from the engine 20 is exhausted from the exhaust purification device 30. Therefore, the exhaust gas purification device 30 can be efficiently activated by suppressing the temperature drop until it is introduced into the interior of the exhaust gas.

Next, the exhaust purification device cover 40 will be described.
As shown in FIG. 6, the exhaust purification device cover 40 mainly includes a cover main body 45 and a lid portion 41. The exhaust purification device cover 40 is provided around the exhaust purification device 30 with the longitudinal direction thereof being the front-rear direction in the same manner as the exhaust purification device 30.

The cover main body 45 is a member that mainly stores the exhaust purification device 30. The cover main body 45 is formed in a bottomed cylindrical shape that opens rearward.
A flange 45a is formed in a hook shape on the rear end peripheral edge portion of the cover main body 45. An opening 47 is provided at the front end portion of the right side surface of the cover main body 45 and the inlet portion 32 of the exhaust purification device 30 that guides exhaust gas discharged from the engine 20 to the inside is provided inside the cover main body 45. To the outside through the opening 47. An opening 48 is provided outwardly at a substantially central lower portion of the cover main body 45, and an attachment portion 44 for attaching the exhaust purification device 30 to the flywheel case 21 is provided from the inside of the cover main body 45 through the opening 48. Provided in a protruding manner.

  The lid portion 41 is a member that removably covers the rear end of the cover main body 45 formed of a bottomed cylindrical member. The lid portion 41 is formed in a closed and bottomless cylindrical shape that opens forward, and a flange 41a is formed in a flange shape at the peripheral edge portion of the front end. An opening 42 is provided in the center of the rear surface of the lid 41 toward the rear.

  The rear end, which is one end of the cover main body 45 of the exhaust purification device cover 40, serves as an outlet for a device housed in the exhaust purification device cover 40. That is, by removing the cover 41 from the exhaust purification device cover 40, for example, the filter of the exhaust purification device 30 can be removed or attached through the outlet.

  The exhaust purification device cover 40 is disposed with the lid 41 facing the “maintenance side”. Specifically, as shown in FIG. 2, the lid portion 41 is disposed rearward on the rear side of the exhaust purification device cover 40, and close to the rotatable rear portion of the bonnet 5 inside the hood 5 of the excavator 1. And arranged so as to face each other.

  The flange 41a of the cover part 41 and the flange 45a of the cover main body 45 are disposed opposite to each other on the same axis, and are fixed by a plurality of bolts 43, 43. At this time, the bolts 43, 43... Are screwed together from the maintenance side. From the opening 42 on the rear surface of the lid portion 41, an outlet portion 35 of the exhaust purification device 30 is provided so as to protrude outward, and an outlet pipe through which exhaust gas is discharged from the inside of the exhaust purification device 30 to the outside. 35a is penetrated. The outlet portion 35 is fixed to the rear surface of the exhaust purification device 30 with a plurality of bolts 31, 31.

  When the inside of the exhaust purification device 30 is maintained, after the rear portion of the bonnet 5 is rotated upward on the “maintenance side”, the bolts 31, 31. The outlet part 35 through which 35a is inserted is removed. Thereafter, the bolts 43, 43,... Are removed, and the lid 41 is removed from the exhaust purification device cover 40. As a result, the exhaust purification device 30 can be exposed rearward, and maintenance inside the exhaust purification device 30 can be performed, for example, replacement of the filter.

  With the configuration as described above, in the excavator 1, by rotating the rear part of the bonnet 5 upward, the exhaust purification device cover 40 is easily accessible from the outside of the bonnet 5 and is obstructed by other parts. Thus, the maintenance of the exhaust purification device 30 can be easily performed. In such a configuration, the outlet pipe 35a can be easily handled.

DESCRIPTION OF SYMBOLS 1 Excavator 20 Engine 21 Flywheel case 22 Hydraulic pump 29 Engine support member 30 Exhaust purification device 40 Exhaust purification device cover 41 Cover part 45 Cover main body

Claims (2)

In a work vehicle comprising an engine and a hydraulic pump coupled to an output shaft of the engine inside the bonnet,
An exhaust purification device is connected to the exhaust manifold of the engine;
The exhaust emission control device is disposed above at least one of an engine flywheel case and the hydraulic pump, and fits in the front, rear, left, right, up and down direction widths of the engine or an engine support member that supports the engine. And
A working vehicle characterized by that. The exhaust purification device is housed in a cylindrical cover,
The outlet provided at one end of the cover is arranged toward the maintenance side where the fuel injection pump and the fuel filter of the engine are arranged.
The work vehicle according to claim 1.

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