JP2021110121A - Machine body and working machine - Google Patents

Abstract

To provide a machine body allowing arrangement of supply pipings to be easily carried out at a place where impact of heat of an exhaust gas purification device affect is minimized using space effectively.SOLUTION: A machine body 11 is provided with an exhaust gas purification device 25 placed adjacently to an engine 23. The exhaust gas purification device 25 is provided with an injector 44 injecting liquid reductant reducing a predetermined oxide in exhaust gas out of the engine 23 at its rear part. The machine body 11 is provided with a tank 19 for reductant storing the liquid reductant. The tank 19 for reductant is placed away forward from the exhaust gas purification device 25. The machine body 11 is provided with a pump 20 for redundant discharging the liquid redundant stored in the tank 19 for reductant. The machine body 11 is provided with supply pipings 45 supplying the liquid reductant from the pump 20 for reductant to the injector 44 of the exhaust gas purification device 25. A part of the supply pipings 45 is arranged to pass between the engine 23 and the exhaust gas purification device 25.SELECTED DRAWING: Figure 1

Description

The present invention relates to an airframe having an exhaust gas purification device that reduces a predetermined oxide in the exhaust gas of an engine and a work machine equipped with the device.

Generally, a diesel engine is used as an engine of a work machine such as a hydraulic excavator. Since the exhaust gas discharged from the diesel engine contains a large amount of nitrogen oxides, an exhaust gas purification device that reduces the nitrogen oxides to nitrogen by injecting a liquid reducing agent into the exhaust gas is installed.

The reducing agent tank that stores the liquid reducing agent and the injector that is the injection device of the exhaust gas purification device are connected by a supply pipe, and the liquid is reduced from the reducing agent tank to the injector of the exhaust gas purification device through this supply pipe. The agent is supplied.

In the layout where the injector is arranged at the rear and the reducing agent tank is arranged at the front, the supply pipe is arranged along the outside of the airframe by bypassing the exhaust gas purification device (see, for example, Patent Documents 1 to 3). .).

Japanese Unexamined Patent Publication No. 2013-241809 Japanese Unexamined Patent Publication No. 2014-80907 Japanese Unexamined Patent Publication No. 2016-138370

When diverting the supply pipe from the reducing agent tank to the outside of the machine, a separate member is required to support the supply pipe, or the supply pipe is installed inside the frame or pillar to protect the liquid reducing agent from heat. It is necessary to use a special structure such as passing through, or to form an air passage for cooling the supply pipe with a cooling fan.

Further, when many pumps and hydraulic devices are arranged in the pump chamber located below the exhaust gas purification device, sufficient space may not be secured and it may be difficult to arrange the measures to the outside of the machine body. In that case, if the supply pipe is arranged so as to surround the exhaust gas purification device at a position above the exhaust gas purification device, further measures are required so that the liquid reducing agent is not affected by the heat from the exhaust gas purification device that becomes hot. Become.

The present invention has been made in view of these points, and is an machine capable of effectively arranging supply pipes in a place that is not easily affected by heat of an exhaust gas purification device by effectively utilizing space, and a work machine provided with the same. Is intended to provide.

The invention according to claim 1 comprises an engine, an exhaust gas purification device provided at the rear thereof with an injector for injecting a liquid reducing agent for reducing a predetermined oxide in the exhaust gas of the engine, and an exhaust gas purification device arranged adjacent to the engine. A reducing agent tank that is arranged in front of the exhaust gas purification device and stores the liquid reducing agent, a reducing agent pump that discharges the liquid reducing agent stored in the reducing agent tank, and a part of the engine and exhaust gas purification. The aircraft is provided with a supply pipe that is arranged between the devices and supplies the liquid reducing agent from the reducing agent pump to the injector of the exhaust gas purification device.

The invention according to claim 2 includes a main body frame having a center frame at the center in both directions in the machine body according to claim 1, the engine is supported by the center frame, and an exhaust gas purifying device, a reducing agent tank, and reduction are provided. The agent pumps are supported by the main body frame on one side of the center frame, and the supply pipes are arranged along the center frame.

According to a third aspect of the present invention, in the airframe according to the first or second aspect, a support for supporting the exhaust gas purification device is provided, the support includes a side surface portion facing the engine, and a part of the supply pipe is provided. It is fixed to the side surface of the support.

The invention according to claim 4 is a work machine including the machine according to any one of claims 1 to 3 and a work device mounted on the machine.

According to the invention of claim 1, the space between the engine and the exhaust gas purification device can be effectively used, and the supply pipe can be easily arranged in a place that is not easily affected by the heat of the exhaust gas purification device.

According to the second aspect of the present invention, the supply pipe can be arranged from the reducing agent pump to the exhaust gas purifying device along the center frame in the shortest time, and the heat receiving distance of the liquid reducing agent can be shortened.

According to the invention of claim 3, the supply pipe is not easily affected by the heat of the exhaust gas purification device by using the side surface portion of the support supporting the exhaust gas purification device without using a dedicated member separately. Can be placed below the device.

According to the invention of claim 4, it is possible to provide a working machine in which the machine body is arranged in a space-saving manner and the exhaust gas discharged from the engine can be efficiently reduced by a liquid reducing agent by an exhaust gas purifying device.

It is a perspective view which shows one Embodiment of the airframe which concerns on this invention from above. It is a perspective view which shows the above-mentioned aircraft from the side. It is a side view of the work machine provided with the above-mentioned machine body.

Hereinafter, the present invention will be described in detail based on the embodiment shown in FIGS. 1 to 3.

As shown in FIG. 3, in the hydraulic excavator type work machine 10, the machine body 11 includes a lower traveling body 12 and an upper turning body 13 provided so as to be able to turn on the lower traveling body 12, and the machine body 11 is provided. The work device 14 is mounted on the upper swing body 13 of the above. In the illustrated example, the working device 14 is of a bucket type, but is not limited to this, and may be equipped with a breaker or the like.

The upper swivel body 13 includes tanks such as a cab 18 provided with an operator's driver's seat, a reducing agent tank 19, a reducing agent pump 20, a fuel tank 21, and a hydraulic oil tank 22 on a swivel frame 16 which is a main body frame. It is equipped with an engine 23, a pump, and an exhaust gas purification device (exhaust gas aftertreatment device) 25. A counterweight 26 is installed behind the upper swing body 13.

As shown in FIGS. 1 and 2, the swivel frame 16 has a center frame 28 at the center in the left-right direction, which is both sides. The center frame 28 is formed linearly in the front-rear direction. The center frame 28 includes a pair of vertical plates 28a and 28a separated from each other in the left-right direction, and the base end portion of the working device 14 (FIG. 3) is axially supported between the front portions of the vertical plates 28a and 28a. NS.

Further, the swivel frame 16 has side frames 30 and 31 on the left and right sides of the center frame 28. The side frames 30 and 31 are configured by welding a beam member extending in the left-right direction to the center frame 28, welding a frame body to the tip of the beam member, and welding a support member. The side frames 30 and 31 extend in the front-rear direction, respectively. The cab 18 (FIG. 3) is arranged on the left side frame 30. Further, on the right side frame 31, the reducing agent tank 19, the reducing agent pump 20, the fuel tank 21, the hydraulic oil tank 22, and the pump shown in FIG. 3 are sequentially arranged from the front to the rear. In addition, the exhaust gas purification device 25 is arranged at a position above the pump. The swivel frame 16 is covered with a decorative cover.

The reducing agent tank 19 shown in FIG. 1 stores a liquid reducing agent such as urea water used in the exhaust gas purification device 25. Further, the reducing agent pump 20 pumps up and discharges the liquid reducing agent stored in the reducing agent tank 19 to supply the liquid reducing agent to the exhaust gas purification device 25. The reducing agent tank 19 and the reducing agent pump 20 are arranged at the front end portion of the swivel frame 16 in the present embodiment. In the illustrated example, the reducing agent tank 19 and the reducing agent pump 20 are located at the front end of the right side frame 31. Therefore, the reducing agent tank 19 and the reducing agent pump 20 are located in front of the exhaust gas purifying device 25 and away from the exhaust gas purifying device 25. The reducing agent tank 19 and the reducing agent pump 20 are housed inside a storage box for storing, for example, tools.

The engine 23 shown in FIGS. 1 and 2 is supported by a support 32, which is an engine support member (engine sub-assembly), with respect to the turning frame 16. In the present embodiment, the support 32 is arranged at the rear part of the center frame 28 between the vertical plates 28a and 28a. That is, the engine 23 is supported by the swivel frame 16 behind the working device 14 (FIG. 3). In the illustrated example, the engine 23 is located at the center of the swivel frame 16 in the left-right direction. Further, as shown in FIG. 3, the engine 23 is housed in a machine room (engine room) partitioned behind the working device 14. That is, the engine 23 is arranged at the rear of the turning frame 16 and in front of the counterweight 26. In the machine room, a cooling package (not shown) such as a radiator and an oil cooler, and a cooling fan (not shown) that cools the cooling package by applying cooling air sucked from the outside are arranged.

The pump is a hydraulic pump, is connected to the engine 23, and is driven by the engine 23. This pump is housed in a pump chamber adjacent to the right side of the machine room. The pump chamber is arranged behind the hydraulic oil tank 22 over the right side of the swivel frame 16. In addition, various hydraulic devices and the like may be housed inside the pump chamber.

The exhaust gas purification device 25 purifies the exhaust gas from the exhaust system of the engine 23. As shown in FIGS. 1 and 2, the exhaust gas purification device 25 is supported by the swivel frame 16 via a base 34 which is a support.

In the present embodiment, the base 34 arranges the exhaust gas purification device 25 above the pump chamber. The base 34 includes a mounting portion 34a on which the exhaust gas purification device 25 is mounted. The mounting portion 34a is located at the top of the base 34. The mounting portion 34a is formed in a flat plate shape, for example. In the present embodiment, the mounting portion 34a is formed in a square shape. The mounting portion 34a is arranged along the longitudinal direction along the front-rear direction and the lateral direction along the left-right direction. The mounting portion 34a is located above the engine 23 in the vertical direction. Further, the base 34 includes a leg portion 34b extending downward from the mounting portion 34a. The lower end of the leg 34b is fixed to the swivel frame 16 via the support 32.

The base 34 includes a side surface portion 34c. The side surface portion 34c is formed in a plate shape along a direction intersecting or orthogonal to the mounting portion 34a. The side surface portion 34c is formed so as to extend downward from the long side of the mounting portion 34a. That is, the side surface portion 34c is formed linearly along the front-rear direction and is located facing the engine 23. In the illustrated example, the side surface portion 34c is located on the right side, which is one side with respect to the engine 23. Therefore, the exhaust gas purification device 25 mounted on the mounting portion 34a of the base 34 is arranged on the right side, which is one side of the engine 23, at a distance from the engine 23, and is disposed with the engine 23 via the gap G. Facing each other. The gap G between the engine 23 and the exhaust gas purification device 25 extends linearly rearward at a position lateral to one of the vertical plates 28a of the center frame 28. Further, the side surface portion 34c is located below the exhaust gas purification device 25 mounted on the mounting portion 34a.

The exhaust gas purification device 25 includes a black smoke removal device (Diesel Particulate Filter) 40 that removes black smoke in the exhaust gas and a nitrogen oxide reduction device (Selective Catalytic) that reduces nitrogen oxides that are predetermined oxides in the exhaust gas. It is equipped with a Reduction) 41 and a Diesel Oxidation Catalyst 42. In the present embodiment, the black smoke removing device 40 and the nitrogen oxide reducing device 41 are arranged in series in the front-rear direction, and the diesel oxidation catalyst 42 is located on the side of the black smoke removing device 40 and the nitrogen oxide reducing device 41. Is placed. Further, the diesel oxidation catalyst 42 is located above the black smoke removing device 40 and the nitrogen oxide reducing device 41. Further, the diesel oxidation catalyst 42 is connected to the black smoke removing device 40 via a connecting pipe 43, and an injector 44, which is an injection device for injecting a liquid reducing agent, is arranged in the connecting pipe 43. In the illustrated example, the black smoke removing device 40 and the nitrogen oxide reducing device 41 are located on the right side, and the diesel oxidation catalyst 42, the connecting pipe 43, and the injector 44 are located on the left side. The diesel oxidation catalyst 42 and the connecting pipe 43 are arranged side by side. The injector 44 is located at the rear of the exhaust gas purification device 25. The black smoke removing device 40, the nitrogen oxide reducing device 41, and the diesel oxidation catalyst 42 are each formed in a substantially cylindrical shape having an axis along the front-rear direction.

Then, the front end portion of the diesel oxidation catalyst 42 is connected to the exhaust port of the engine 23 via a connection pipe that is the starting point of the exhaust pipeline, and the connection pipe 43 is connected to the rear end portion of the diesel oxidation catalyst 42. The rear end is connected, the front end of the connecting pipe 43 is connected to the black smoke removing device 40, the front part of the nitrogen oxide reducing device 41 is connected to the rear of the black smoke removing device 40, and the nitrogen oxide is oxidized. The rest of the exhaust line is connected to the rear end of the material reduction device 41.

A supply pipe 45 for supplying the liquid reducing agent from the reducing agent tank 19 to the injector 44 by the reducing agent pump 20 is connected to the injector 44.

In the supply pipe 45, the first part 45a is arranged in the front-rear direction along the vertical plate 28a from the reducing agent tank 19 via the reducing agent pump 20, and the second part 45b following the first part 45a is the engine 23 and the exhaust gas purification device. Arranged vertically at the position in front of 25, the third part 45c following the second part 45b is arranged between the engine 23 and the exhaust gas purification device 25, and its end is arranged from the rear to the front of the exhaust gas purification device 25. It is folded back toward it and is connected to the injector 44. The supply pipe 45 extends from the first portion 45a to the third portion 45c and is linearly arranged along the front-rear direction in the inner portion of the swivel frame 16 (airframe 11) when viewed from above. The supply pipe 45 is fixed at a plurality of locations by the fixture 46. In the illustrated example, the supply pipe 45 is formed as a single pipe, but the present invention is not limited to this, and a plurality of pipes may be connected and formed. That is, the first portion 45a, the second portion 45b, and the third portion 45c may be integrated pipes, or may be configured by connecting a plurality of divided pipes.

The first part 45a is the longest main part in the supply pipe 45. The first portion 45a is arranged linearly in the front-rear direction between the fuel tank 21 and the hydraulic oil tank 22 (FIG. 3) and the vertical plate 28a. The first part 45a is arranged along the swivel frame 16. That is, the first portion 45a is at the lowest position of the supply pipe 45.

The second portion 45b is a connecting portion connecting the first portion 45a and the third portion 45c whose positions in the vertical direction are different from each other. The second portion 45b is bent upward from the rear end of the first portion 45a.

The third portion 45c is an interposition located between the engine 23 and the exhaust gas purification device 25. The upstream side of the third portion 45c is bent rearward from the upper end portion of the second portion 45b. The third portion 45c is arranged linearly in the front-rear direction at a position above the first portion 45a. The third portion 45c is passed through the gap G between the engine 23 and the exhaust gas purification device 25. Further, in the present embodiment, the third portion 45c is arranged along the side surface portion 34c of the base 34 and is fixed to the side surface portion 34c. Therefore, the third portion 45c is arranged in the vertical direction toward the upper side of the engine 23 and below the exhaust gas purification device 25. The third portion 45c is integrally fixed to the base 34. Further, the downstream side of the third portion 45c is bent upward and laterally from the rear of the exhaust gas purification device 25 and is connected to the injector 44.

Then, a liquid reducing agent such as urea water in the reducing agent tank 19 is pumped up by the reducing agent pump 20 and supplied to the injector 44 of the exhaust gas purification device 25 through the supply pipe 45, and the injector 44 upstream of the black smoke removing device 40. Inject to the side.

In the case of the machine 11 provided with such an exhaust gas purification device 25, the injector 44 is provided on the rear side opposite to the reducing agent tank 19 and the reducing agent pump 20 so that the exhaust gas purification device 25 can be shared by a plurality of models. When using a pump, the supply pipe 45 from the reducing agent pump 20 to the injector 44 has to be arranged by bypassing the exhaust gas purification device 25, and many pumps and hydraulic devices are arranged and supplied on the pump chamber side. Due to the layout of the machine 11 and equipment, such as insufficient space for the pipe 45 to pass through, it may be restricted to arrange the supply pipe 45 outside the machine 11. In such a case, as shown by the alternate long and short dash line L in FIGS. 1 and 2, when a part of the supply pipe 45 is arranged so as to surround the upper side of the exhaust gas purification device 25 and bypass it, the high temperature exhaust gas is exhausted. The heat from the purification device 25 may cause deterioration of the liquid reducing agent and deterioration of performance, and the supply pipe 45 may become long, which not only takes up space for arrangement but also may increase the heat receiving distance.

Therefore, in the present embodiment, a part of the supply pipe 45 (third part 45c) is arranged between the engine 23 and the exhaust gas purification device 25 to create a space between the engine 23 and the exhaust gas purification device 25. By effectively using it, the supply pipe 45 can be easily arranged (routine) in a place that is not easily affected by the heat of the exhaust gas purification device 25 that is a heat source, and interference with other parts such as hydraulic equipment can be avoided. ..

Further, the exhaust gas purification device 25, the reducing agent tank 19 and the reducing agent pump 20 are supported on the swivel frame 16 on one side with respect to the center frame 28 supporting the engine 23, and the supply pipe 45 is arranged along the center frame 28. By doing so, the supply pipe 45 can be arranged in the shortest distance from the reducing agent pump 20 to the engine 23 and the exhaust gas purification device 25 along the center frame 28, and the heat receiving distance of the liquid reducing agent can be shortened.

Further, by fixing a part of the supply pipe 45 (third part 45c) to the side surface portion 34c of the base 34 that supports the exhaust gas purification device 25 facing the engine 23, the exhaust gas is exhaust gas without using a special member separately. By utilizing the side surface portion 34c of the base 34 that supports the purification device 25, the supply pipe 45 can be arranged below the exhaust gas purification device 25 that is not easily affected by the heat of the exhaust gas purification device 25.

Moreover, a part of the supply pipe 45 (third part 45c) passing between the engine 23 and the exhaust gas purification device 25 can be assembled to the swivel frame 16 in a state of being incorporated in the base 34 in advance, so that the assembleability is improved. Can also be expected.

Then, by providing the above-mentioned machine body 11, it is possible to provide a work machine 10 in which the body 11 can be arranged in a space-saving manner and the exhaust gas discharged from the engine 23 can be efficiently reduced by the exhaust gas purifying device 25 with a liquid reducing agent. ..

In the above embodiment, the third portion 45c of the supply pipe 45 is not limited to the one fixed to the side surface portion 34c of the base 34, for example, the exhaust gas purification device 25 and the engine 23 on the mounting portion 34a. It may be arranged between.

Further, the machine body 11 can also be applied to a non-swivel type work machine 10.

Further, the machine body 11 can be applied to other than a work machine as long as it is driven by an engine, and can be applied to, for example, a transportation machine.

The present invention can be used by a business operator involved in the manufacturing industry of airframes and work machines, which is characterized by the arrangement structure of an exhaust gas aftertreatment device.

10 work machine
11 Aircraft
14 Working equipment
16 Swivel frame, which is the main body frame
19 Reducing agent tank
20 Reducing agent pump
23 engine
25 Exhaust gas purification device
28 Center frame
34 Support base
34c side part
44 injector
45 Supply piping

Claims (4)

With the engine
An exhaust gas purification device, which is provided at the rear with an injector that injects a liquid reducing agent that reduces a predetermined oxide in the exhaust gas of the engine, and is arranged adjacent to the engine.
A reducing agent tank, which is arranged in front of the exhaust gas purification device and stores the liquid reducing agent,
A reducing agent pump that discharges the liquid reducing agent stored in this reducing agent tank,
A supply pipe that is partly arranged between the engine and the exhaust gas purification device and supplies the liquid reducing agent from the reducing agent pump to the injector of the exhaust gas purification device.
An aircraft characterized by being equipped with. A main body frame having a center frame in the center in both directions is provided.
The engine is supported by the center frame
The exhaust gas purification device, the reducing agent tank, and the reducing agent pump are each supported by the main body frame on one side with respect to the center frame.
The airframe according to claim 1, wherein the supply pipe is arranged along the center frame. Equipped with a support to support the exhaust gas purification device,
The support has sides facing the engine and
The airframe according to claim 1 or 2, wherein a part of the supply pipe is fixed to a side surface portion of the support. The aircraft according to any one of claims 1 to 3 and
A work machine characterized by being equipped with a work device mounted on this machine.

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