JP5895951B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine.

  In recent years, work machines equipped with an SCR (Selective Catalytic Reduction) system are increasing in order to reduce NOx and the like contained in exhaust gas. In the SCR system, reduction of NOx or the like is generally promoted by adding a reducing agent such as urea water to the exhaust gas.

  Patent Document 1 has a configuration in which a liquid reducing agent tank is connected to an exhaust pipe by a liquid reducing agent supply pipe, and an aqueous urea solution in the liquid reducing agent tank can be supplied to the exhaust pipe by a liquid reducing agent supply pump. It is disclosed.

JP 2003-20936 A

  By the way, in the invention of Patent Document 1, various studies have been made as to where the reducing agent tank is arranged in the upper swing body, but the specific arrangement of the supply pump is described. Absent. Therefore, depending on the position of the supply pump, there is a problem that stones, rubble, etc. scattered by the traveling lower traveling body collide with the supply pump and are damaged.

  This invention is made | formed in view of this point, and the objective is to prevent that a supply pump is damaged by the stone etc. which scattered during driving | running | working by devising arrangement | positioning of a supply pump.

  The present invention is directed to a construction machine in which a reducing device that reduces exhaust gas by supplying a reducing agent to exhaust gas of an engine is mounted on an upper swing body, and has taken the following solutions.

That is, in the first invention, the upper swing body has a bottom plate and a pair of left and right vertical plates that stand from the bottom plate and extend in the front-rear direction.
The reducing device has a reducing agent tank in which the reducing agent is stored, and a supply pump for sucking the reducing agent stored in the reducing agent tank and feeding it into the exhaust path of the engine,
The reducing agent tank is disposed outward in the vehicle width direction from one vertical plate of the pair of left and right vertical plates in the upper swing body,
The feed pump is attached to the side wall surface of the vertical plate is disposed between the one vertical plate and the reducing agent tank to overlap in the reducing agent tank in a side view,
Inside the supply pump, a cylindrical filter member for removing foreign substances contained in the reducing agent sucked up from the reducing agent tank is accommodated so as to be able to be taken in and out in the cylindrical axis direction.
A tool box for storing a tool is disposed outside the one vertical plate in the upper swing body in the vehicle width direction and on the front side of the reducing agent tank,
The tool box is provided with a gap between the tool box and the one vertical plate so as not to overlap the supply pump in a front view .

  In the first invention, the reducing agent tank is disposed outward in the vehicle width direction from the vertical plate in the upper swing body, and the supply pump is disposed between the vertical plate and the reducing agent tank.

  With such a configuration, the supply pump is covered with the reducing agent tank in a side view, so even if stones and debris are scattered by the lower traveling body while traveling, stones and debris etc. There is no collision. In addition, since the supply pump is disposed at a position closer to the turning center of the upper swing body than the reducing agent tank, the influence of the impact force when the upper swing body swings during traveling or excavation work is affected. Can be reduced.

In addition, by attaching a supply pump to the side wall of the highly rigid vertical plate, it is possible to prevent vibration during traveling from being transmitted to the supply pump without providing an anti-vibration mount. Become.

In addition, a gap is provided between the tool box and the vertical plate so as not to overlap the supply pump in front view. Thus, when the operator performs maintenance of the supply pump, the hand can be reached from this gap to access the supply pump, and the maintainability is improved.

According to a second invention, in the first invention ,
Before Symbol feed pump is characterized in that it is arranged in a possible out position the filter member obliquely downward.

In the second invention, the supply pump is disposed so that the filter member can be taken in and out from obliquely below. Therefore, when the operator replaces the filter member by reaching out from above the supply pump, It becomes easy to perform the operation | work which takes in and out a member .

According to a third invention, in the first or second invention,
A front cover that covers the supply pump in a front view is detachably provided between the tool box and the vertical plate.

In the third invention, since the supply pump is covered with the front cover when viewed from the front, the supply pump can be protected from stones, debris, and the like, and the front cover can be removed to maintain the supply pump.

According to a fourth invention, in any one of the first to third inventions,
A tank cover is provided to cover the reducing agent tank and the supply pump.

In the fourth aspect of the invention, the tank cover covers the upper part of the reducing agent tank and the supply pump, so the number of parts can be reduced compared to the case where the reducing agent tank cover and the supply pump cover are provided separately. Can be reduced. The tank cover can protect the reducing agent tank and the supply pump from rainwater and the like.

A fifth invention is the fourth invention,
The tank cover constitutes a tread surface for an operator to get on and off the upper revolving structure.

In the fifth invention, the tank cover can be used as a tread when an operator gets on and off the upper swing body, so there is no need to separately provide a step, and the number of parts can be reduced.

A sixth invention is the fourth or fifth invention, wherein
The tank cover includes a tank cover portion that covers an upper portion of the reducing agent tank, and a pump that is disposed to be lower than the height of the tank cover portion and overlap the vertical plate in a side view and covers the upper portion of the supply pump. Formed in a stepped shape so as to have a cover part,
A seal member is sandwiched between an edge of the pump cover portion on the vertical plate side and a side wall surface of the vertical plate.

In the sixth aspect of the invention, the tank cover is provided with a tank cover portion that covers the upper portion of the reducing agent tank and a pump cover portion that covers the upper portion of the supply pump in steps. The pump cover portion overlaps the vertical plate in a side view, and a seal member is sandwiched between the pump cover portion and the vertical plate. Accordingly, rainwater or the like does not leak from the gap between the pump cover portion and the vertical plate and the supply pump does not get wet, and the supply pump can be reliably protected from rainwater or the like.

A seventh invention is the sixth invention, wherein
The pump cover portion is inclined obliquely downward toward the front of the vehicle.

In the seventh invention, since the pump cover portion is inclined obliquely downward toward the front of the vehicle, rainwater and the like flow down along the inclined surface of the pump cover portion, so that rainwater and the like accumulate on the upper surface of the pump cover portion. There is no.

  According to the present invention, since the supply pump is covered with the reducing agent tank in a side view, even if stones, rubble, and the like are scattered by the traveling lower traveling body, the stones, rubble, etc. collide with the supply pump. There is nothing. In addition, since the supply pump is disposed at a position closer to the turning center of the upper swing body than the reducing agent tank, the influence of the impact force when the upper swing body swings during traveling or excavation work is affected. Can be reduced.

It is a top view which shows schematic structure of the construction machine which concerns on the reference example of this invention. It is a side view which shows the structure of a tool box and a tank cover. It is a top view which shows the structure of a reducing apparatus. It is a side view which shows the structure of a supply pump and a tank cover. Is a plan view showing the configuration of a reduction device of the present embodiment form state. It is a side view which shows the structure of a supply pump and a tank cover. It is a front view which shows the structure of a tool box. It is a front view which shows the structure of a reducing apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use. In each figure, the up / down and front / rear / left / right directions are indicated by arrows. Unless stated otherwise, the vertical direction will be described according to the directions indicated by these arrows.

《 Reference example 》
FIG. 1 is a plan view showing a schematic configuration of a construction machine according to this reference example . The construction machine 10 is a hydraulic excavator in which an upper swing body 12 is mounted on a crawler type lower traveling body 11. On the upper frame 20 of the upper swing body 12, an attachment 13, a cab 14, a counterweight 15, a tool box 30, a reduction device 40, a fuel tank 51, a hydraulic oil tank 52, a machine chamber 55, and the like are provided. .

  The upper frame 20 of the upper swing body 12 includes a bottom plate 21 and a pair of left and right vertical plates 22 extending in the front-rear direction at an intermediate portion on the bottom plate 21 in the left-right width direction. A strip-shaped reinforcing plate 22a is joined to the rear portion of the upper end of the vertical plate 22, and is formed in a substantially T-shaped cross section. Boom foot pins 25 extending in the vehicle left-right direction are supported on the front portions of the pair of vertical plates 22. The attachment 13 includes a boom 13a, an arm, and the like, and a base end portion of the boom 13a is rotatably supported by a boom foot pin 25.

  On the left side of the front part of the upper swing body 12, there is disposed a cab 14 that is equipped with a driver's seat, various operation devices, and instruments and divides the operator's operation space. A fuel tank 51 that stores fuel for driving the engine is disposed at the rear of the cab 14.

  A tool box 30, a reducing agent tank 41, and a hydraulic oil tank 52 for storing hydraulic oil for hydraulic control are arranged in order from the front on the right side of the front part of the upper swing body 12. A step platform 24 is provided in front of the tool box 30 in the upper frame 20 of the upper swing body 12. The specific configurations of the tool box 30 and the reducing agent tank 41 will be described later.

  A machine room 55 is provided at the rear of the upper swing body 12 over both the left and right sides. The machine room 55 is covered with a machine room cover 55a. The machine chamber 55 is partitioned into an intake chamber 56, an engine chamber 57, and a pump chamber 58 in order from the left, and an engine 65, a radiator 62, a hydraulic pump 66, and the like are installed therein.

  An intake duct 60 is disposed in the intake chamber 56. A dust-proof filter 61 is attached to the upstream side of the intake duct 60 in the air flow direction. A radiator 62 is attached to a partition wall between the intake chamber 56 and the engine chamber 57.

  An engine 65 is installed in the engine chamber 57. A hydraulic pump 66 is installed in the pump chamber 58. An exhaust pipe 67 and a muffler 68 extending from the engine 65 are disposed in a range extending from the engine chamber 57 to the pump chamber 58. Exhaust gas discharged from the engine 65 is exhausted to the outside of the machine room 55 through the exhaust pipe 67 and the muffler 68. In the vicinity of the radiator 62 in the engine chamber 57, a cooling fan 63 that is rotationally driven by the engine 65 is disposed. The periphery of the fan 63 is covered with a fan shroud 64.

  As shown in FIG. 2, the tool box 30 has a storage space S inside and a box main body 31 in which an opening 31 a for taking in and out the tool is formed, and an opening 31 a of the box main body 31. And an open / close lid 35 that can be opened and closed.

  The opening 31a of the box body 31 is formed to open upward. A hinge 32 having a pivot shaft 32 a extending in the left-right direction is attached to the upper end portion of the rear side wall of the box body 31. An upper edge portion of the opening / closing lid 35 is attached to the box body 31 via a hinge 32. As a result, the opening / closing lid 35 can be opened and closed around the rotation shaft 32 a of the hinge 32. The opening / closing lid 35 is attached to the box body 31 in a state where it is inclined obliquely downward from the upper edge portion to the lower edge portion when the opening portion 31a is closed.

  The opening / closing lid 35 is formed with a step portion 36 that is recessed toward the storage space S at a substantially central position in the inclination direction. The step portion 36 is provided with a non-slip plate 38, and constitutes a tread surface for placing a foot following the step platform 24 when an operator gets on and off the upper swing body 12.

  A lock mechanism 37 for locking and holding the opening 31 a of the box body 31 in a state of being closed by the opening / closing lid 35 is provided at a position on the opening / closing lid 35 on the right side of the step portion 36.

The construction machine 10 according to this reference example includes a reduction device 40 that uses urea water as a reducing agent in order to reduce NOx and the like contained in the exhaust gas. The urea water is an aqueous solution in which a predetermined amount of urea is added to water.

  As shown also in FIG. 1, the reducing device 40 includes a reducing agent tank 41 in which the reducing agent is stored, and a supply pump for sucking the reducing agent stored in the reducing agent tank 41 and feeding it into the exhaust path of the engine 65. 42 and a reducing agent injection unit 48 that injects the reducing agent fed from the supply pump 42 into the exhaust path. The reducing agent tank 41 and the supply pump 42 are connected via a suction pipe 43a. The supply pump 42 and the reducing agent injection unit 48 are connected via a supply pipe 43b.

  As shown in FIG. 3, the reducing agent tank 41 is disposed on the right outside of the vertical plate 22 in the upper swing body 12 and on the rear side of the tool box 30. A gap is provided between the vertical plate 22 and the reducing agent tank 41, and the supply pump 42 is disposed in this gap so as to overlap the reducing agent tank 41 in a side view. The supply pump 42 is attached to the side wall surface of the vertical plate 22 via a mounting bracket 44 welded to the side wall surface of the vertical plate 22.

  The upper part of the reducing agent tank 41 and the supply pump 42 is covered with a tank cover 45. The left end portion of the tank cover 45 extends so as to straddle the upper side of the vertical plate 22. This prevents rainwater and the like from leaking out from the gap between the left end of the tank cover 45 and the vertical plate 22 to wet the supply pump 42.

  A non-slip plate 38 is provided on the upper surface of the tank cover 45 and constitutes a tread surface for an operator to get on and off the upper swing body 12. The right end edge of the tank cover 45 extends downward so as to cover the right side wall of the reducing agent tank 41.

  With such a configuration, the supply pump 42 is covered with the reducing agent tank 41 and the tank cover 45 in a side view. Therefore, even if stones, debris, etc. are scattered by the lower traveling body 11 during traveling, And rubble do not collide with the supply pump 42.

  As shown in FIG. 4, a cylindrical filter member 42a for removing foreign substances contained in the reducing agent sucked up from the reducing agent tank 41 is accommodated in the supply pump 42 so as to be able to be taken in and out in the cylinder axis direction. Has been. The inlet / outlet port of the filter member 42a opens at the lower front side of the supply pump 42 and is closed by the cap portion 42b.

  The supply pump 42 is attached to the side wall surface of the vertical plate 22 so as to be inclined obliquely upward toward the front of the vehicle so that the filter member 42a can be taken in and out from obliquely below. Thereby, when exchanging the filter member 42a, the operator can easily perform the operation of extending and removing the filter member 42a by extending the hand from above the supply pump 42 by removing the top plate portion of the tank cover 45. .

"Implementation-shaped state"
Figure 5 is a plan view showing a configuration of a reduction device of the present embodiment form state. Hereinafter, the same parts as those in the reference example are denoted by the same reference numerals, and only differences will be described.

  As shown in FIGS. 5 to 8, a tool box 30 is disposed on the front side of the reducing agent tank 41 in the upper swing body 12. The tool box 30 is disposed with a gap between the tool box 30 and the vertical plate 22 so as not to overlap the supply pump 42 in a front view. A front cover 46 that covers the supply pump 42 in a front view is detachably provided between the tool box 30 and the vertical plate 22.

  With such a configuration, when the operator performs maintenance of the supply pump 42, the front cover 46 is removed and the hand is extended from the gap between the vertical plate 22 and the tool box 30, so that the front revolving body 12 can be viewed from the front side. The supply pump 42 can be accessed, and maintenance is improved.

  The tank cover 45 is disposed so as to be lower than the height of the tank cover portion 45a and overlap the vertical plate 22 in a side view and covers the upper portion of the supply pump 42. It is formed in a step shape so as to have a pump cover portion 45b.

  The pump cover part 45b is inclined obliquely downward toward the front of the vehicle. A seal member 47 is sandwiched between the edge on the vertical plate 22 side in the pump cover portion 45 b and the side wall surface of the vertical plate 22.

  In this way, by inclining the pump cover portion 45b obliquely downward toward the front of the vehicle, rainwater and the like flow down along the inclined surface of the pump cover portion 45b, so that rainwater and the like accumulate on the upper surface of the pump cover portion 45b. There is no. Further, since the seal member 47 is sandwiched between the pump cover portion 45b and the vertical plate 22, rainwater or the like leaks from the gap between the pump cover portion 45b and the vertical plate 22, and the supply pump 42 gets wet. Therefore, the supply pump 42 can be reliably protected from rainwater or the like.

  As described above, the present invention provides a highly practical effect that the supply pump can be prevented from being damaged by stones scattered during traveling by devising the arrangement of the supply pump. Therefore, it is extremely useful and has high industrial applicability.

DESCRIPTION OF SYMBOLS 10 Construction machine 12 Top turning body 21 Bottom plate 22 Vertical plate 30 Tool box 40 Reduction device 41 Reductant tank 42 Supply pump 42a Filter member 45 Tank cover 45a Tank cover portion 45b Pump cover portion 46 Front cover 47 Seal member 65 Engine

Claims (7)

A reduction machine for reducing exhaust gas by supplying a reducing agent to engine exhaust gas is a construction machine mounted on an upper swing body,
The upper swing body has a bottom plate and a pair of left and right vertical plates that stand from the bottom plate and extend in the front-rear direction,
The reducing device has a reducing agent tank in which the reducing agent is stored, and a supply pump for sucking the reducing agent stored in the reducing agent tank and feeding it into the exhaust path of the engine,
The reducing agent tank is disposed outward in the vehicle width direction from one vertical plate of the pair of left and right vertical plates in the upper swing body,
The feed pump is attached to the side wall surface of the vertical plate is disposed between the one vertical plate and the reducing agent tank to overlap in the reducing agent tank in a side view,
Inside the supply pump, a cylindrical filter member for removing foreign substances contained in the reducing agent sucked up from the reducing agent tank is accommodated so as to be able to be taken in and out in the cylindrical axis direction.
A tool box for storing a tool is disposed outside the one vertical plate in the upper swing body in the vehicle width direction and on the front side of the reducing agent tank,
The construction machine according to claim 1, wherein the tool box is disposed with a gap between the tool box and the one vertical plate so as not to overlap the supply pump in a front view . Oite to claim 1,
Before Symbol feed pump, a construction machine characterized in that it is arranged in a possible out position the filter member obliquely downward. In claim 1 or 2 ,
A construction machine, wherein a front cover that covers the supply pump in a front view is detachably provided between the tool box and the vertical plate. In any one of claims 1 to 3 ,
A construction machine comprising a tank cover covering above the reducing agent tank and the supply pump. In claim 4 ,
The construction machine according to claim 1, wherein an upper surface of the tank cover constitutes a tread surface for an operator to get on and off the upper revolving structure. In claim 4 or 5 ,
The tank cover includes a tank cover portion that covers an upper portion of the reducing agent tank, and a pump that is disposed to be lower than the height of the tank cover portion and overlap the vertical plate in a side view and covers the upper portion of the supply pump. Formed in a stepped shape so as to have a cover part,
A construction machine, wherein a seal member is sandwiched between an edge of the pump cover portion on the vertical plate side and a side wall surface of the vertical plate. In claim 6 ,
The construction machine according to claim 1, wherein the pump cover portion is inclined obliquely downward toward the front of the vehicle.

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