JP2011231592A - Exhaust device layout for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install an exhaust gas after-treatment device by effectively utilizing a space enough therefor on the upper part of the rear wall surface of a hydraulic oil tank, in such a manner that the space does not cause hindrance to operation of a construction machine such as hydraulic shovel, thereby improving mounting and maintenance workability of the exhaust gas after-treatment device.SOLUTION: In order to achieve the above-described object, there is provided an exhaust device layout for construction machine, in which a diesel engine is used as a prime mover, an exhaust gas after-treatment device 15 is installed in the exhaust system of the diesel engine, the upper part of the rear wall surface of hydraulic oil tank 13 square-shaped in a plan view juxtaposed with a fuel tank 12 is formed as a step structure to be a recess 13a of a required size, and the exhaust gas after-treatment device 15 is installed in the section of the recess 13a.

Description

  The present invention relates to an exhaust device layout of a construction machine, and in particular, effectively utilizes a space above a rear wall surface of a hydraulic oil tank and installs an exhaust gas aftertreatment device in the space. The present invention relates to an exhaust device layout of a construction machine that improves the installation workability and maintenance workability of the apparatus.

  In recent years, construction equipment such as hydraulic excavators equipped with diesel engines has been equipped with exhaust gas aftertreatment devices in the exhaust system of diesel engines in order to comply with high-level exhaust gas regulations. It is discharged into the atmosphere through a NOx reduction catalyst provided on the side.

  As a conventional technique related to the layout of the exhaust gas aftertreatment device in a hydraulic excavator as a construction machine, for example, there is the one shown in FIG. In the figure, a fuel tank 21 in which fuel of a diesel engine is stored and a hydraulic oil tank 22 in which hydraulic oil used for pressure transmission is stored are arranged side by side on a support frame 20 at the rear of an upper swing body in a hydraulic excavator. Has been. The fuel tank 21 is formed in a square shape in plan view, and tapered surfaces 22a and 22a are formed on the side wall surface of the hydraulic oil tank 22 opposite to the contact surface with the fuel tank 21.

  An exhaust gas aftertreatment device 23 is attached to a portion of the rear wall surface slightly below the intermediate position in the height direction of the hydraulic oil tank 22. An exhaust pipe 24 from a diesel engine (not shown) is connected to the exhaust gas aftertreatment device 23. A muffler 25 is connected to the rear portion of the exhaust gas aftertreatment device 23. On the support frame 20 immediately below the exhaust gas aftertreatment device 23, a number of necessary piping and equipment are arranged.

  In addition, it is described in other prior art that many urea selective reduction type NOx treatment apparatuses using an aqueous urea solution (liquid reducing agent) are adopted as the exhaust gas aftertreatment apparatus. The liquid reducing agent tank in which the urea aqueous solution is stored is connected to an exhaust pipe by a liquid reducing agent supply pipe, and the urea aqueous solution in the liquid reducing agent tank can be supplied to the exhaust pipe by a liquid reducing agent supply pump. (For example, refer to Patent Document 1).

JP 2003-20936 A

  In the prior art shown in FIG. 5, the exhaust gas aftertreatment device is attached to a portion of the rear wall surface slightly below the intermediate position in the height direction of the hydraulic oil tank, and immediately below the exhaust gas aftertreatment device. On the support frame, a number of necessary piping and equipment are arranged. For this reason, there was a problem that the workability and maintenance workability of the exhaust gas aftertreatment device were not good.

  Therefore, while ensuring the required capacity of the hydraulic oil tank, the space above the wall surface is effectively used, and an exhaust gas aftertreatment device is installed in this space in a manner that does not hinder the operation of construction machines such as hydraulic excavators. As a result, a technical problem to be solved in order to improve the mounting workability and the maintenance workability of the exhaust gas aftertreatment device arises, and the present invention aims to solve this problem.

  The present invention has been proposed to achieve the above object, and the invention according to claim 1 is a construction in which a diesel engine is used as a prime mover and an exhaust gas aftertreatment device is installed in an exhaust system of the diesel engine. An exhaust device layout of a machine, wherein a recess having a required size is formed by using a step structure on a rear wall upper portion of a hydraulic oil tank arranged in parallel with a fuel tank, and the exhaust gas aftertreatment device is formed in the recess portion. Provide an exhaust system layout of installed construction machinery.

  According to this configuration, an exhaust gas aftertreatment device is installed in a manner that does not interfere with the operation of a construction machine such as a hydraulic excavator, by effectively utilizing the space above the rear wall surface of the hydraulic oil tank effectively. It becomes possible to do.

  According to a second aspect of the present invention, there is provided an exhaust device layout for a construction machine according to the first aspect, wherein the hydraulic oil tank is formed in a square shape in plan view.

  According to this configuration, the required capacity of the hydraulic oil tank can be ensured even if a recess having a required size is formed in the upper part of the rear wall surface of the hydraulic oil tank.

  According to a third aspect of the present invention, in the invention according to the first or second aspect, an exhaust device layout of a construction machine in which a notch is formed in a portion of the fuel tank corresponding to a recess on the hydraulic oil tank side. I will provide a.

  According to this configuration, it is possible to provide a further margin in the space around the installation position of the exhaust gas aftertreatment device.

  The invention according to the first aspect has an advantage that it is possible to improve the mounting workability and maintenance workability of the exhaust gas aftertreatment device by effectively utilizing the space above the rear wall surface of the hydraulic oil tank.

  In addition to the effect of the invention described in claim 1, the invention described in claim 2 can sufficiently secure the required capacity of the hydraulic oil tank even if a recess is formed in the upper part of the rear wall surface of the hydraulic oil tank. There is an advantage that you can.

  In addition to the effect of the invention described in claim 1 or 2, the invention described in claim 3 further provides a space in the upper part of the rear wall surface of the hydraulic oil tank, and the workability of mounting the exhaust gas aftertreatment device and There is an advantage that the maintenance workability can be further improved.

The side view which shows the hydraulic shovel as a construction machine in the exhaust apparatus layout of the construction machine which concerns on the Example of this invention. The top view which shows the upper revolving body part of the hydraulic shovel of FIG. FIG. 2 is an enlarged perspective view showing a layout of an exhaust gas aftertreatment device in the embodiment of FIG. 1. The expansion perspective view for demonstrating the recess formed in the rear wall upper part of the hydraulic oil tank in the Example of FIG. The perspective view which shows the layout of the conventional exhaust-gas aftertreatment apparatus.

  The present invention secures the required capacity of the hydraulic oil tank while effectively utilizing the space above the wall surface, and the exhaust gas aftertreatment device in such a manner that the space does not hinder the operation of a construction machine such as a hydraulic excavator. In order to achieve the purpose of improving the mounting workability and maintenance workability of the exhaust gas aftertreatment device, a diesel engine is used as a prime mover, and the exhaust gas aftertreatment device is used in the exhaust system of the diesel engine. Is a layout of an exhaust device of a construction machine in which a recess of a required size is formed by using a step structure on a rear wall upper portion of a hydraulic oil tank arranged in parallel with a fuel tank, and the exhaust is disposed in the portion of the recess. This was realized by installing a gas aftertreatment device.

  A preferred embodiment of the present invention will be described below with reference to FIGS. In this embodiment, a hydraulic excavator is applied as a construction machine. First, the configuration of the exhaust device layout of the construction machine according to the present embodiment will be described. In FIG. 1, an upper swing body 3 is rotatably mounted on a lower traveling body 2 in a hydraulic excavator 1. A cab 4 is provided on one front side of the upper swing body 3, and a boom 5 is pivotally attached to the front center portion of the upper swing body 3 so as to be able to be raised and lowered. An arm 6 is connected to the tip of the boom 5 so as to be rotatable up and down, and a bucket 7 is attached to the tip of the arm 6 so as to be rotatable up and down.

  As shown in FIG. 2, an engine room 8 is formed at the rear of the upper swing body 3, and a diesel engine 9 is installed on one side in the engine room 8. A cooling fan 10 is attached to the diesel engine 9, and a heat exchanger 11 is installed in front of the cooling fan 10. Further, a fuel tank 12 and a hydraulic oil tank 13 are arranged in parallel on the other side in the engine room 8.

  As shown in enlarged views in FIGS. 3 and 4, the fuel tank 12 and the hydraulic oil tank 13 are arranged side by side on a support frame 14 in the engine room 8, and the hydraulic oil tank 13 is formed in a square shape in plan view. Thereafter, the upper portion of the wall surface has a step structure, and a recess 13a having a required size is formed by the step structure. An exhaust gas aftertreatment device 15 is installed in the recess 13a, and a muffler 16 is connected to the rear portion of the exhaust gas aftertreatment device 15.

  An exhaust pipe 17 from the diesel engine 9 is connected to the exhaust gas aftertreatment device 15. Further, a liquid reducing agent supply pipe from a liquid reducing agent tank (not shown) is connected to the exhaust pipe 17, and the liquid reducing agent (urea aqueous solution) in the liquid reducing agent tank is supplied to the exhaust pipe 17. The exhaust gas aftertreatment device 15 functions as a urea selective reduction type NOx treatment device using an aqueous urea solution.

  Adjacent upper portions of the fuel tank 12 and the hydraulic oil tank 13 arranged side by side are fixed by an angle-shaped joint 18 and a plurality of bolts 19. Further, a notch 12 a is formed in a corner portion of the fuel tank 12 adjacent to the recess 13 a of the hydraulic oil tank 13. The notch 12a is formed in order to give a margin to the space around the installation position of the exhaust gas aftertreatment device 15, so that it is formed at least in the upper portion corresponding to the recess 13a on the hydraulic oil tank 13 side. It only has to be.

  Next, the effect | action of the exhaust apparatus layout of the construction machine comprised as mentioned above is demonstrated. A space having a margin in the upper part of the rear wall surface of the hydraulic oil tank 13 is effectively used, a recess 13a having a required size is formed in the upper part of the rear wall surface of the hydraulic oil tank 13, and the exhaust gas is disposed in the portion of the recess 13a. By installing the processing device 15, the exhaust gas aftertreatment device 15 and the muffler 16 do not protrude from the rear portion of the upper swing body 3, and the exhaust gas is exhausted in a manner that does not hinder the operation of the hydraulic excavator 1. A gas aftertreatment device 15 can be installed.

  The hydraulic oil tank 13 is formed in a square shape in plan view, so that the required capacity of the hydraulic oil tank 13 is ensured even if a recess 13a having a required size is formed on the upper rear wall surface of the hydraulic oil tank 13. It becomes possible. Further, the notch 12a is formed in the corner portion of the fuel tank 12 adjacent to the recess 13a of the hydraulic oil tank 13, so that a further margin is provided in the space around the installation position of the exhaust gas aftertreatment device 15. The exhaust gas aftertreatment device 15 can be easily attached.

  As described above, in the exhaust device layout of the construction machine according to the present embodiment, the space in the upper part of the rear wall surface of the hydraulic oil tank 13 is effectively used, and a recess of a required size is formed in the upper part of the rear wall surface of the hydraulic oil tank 13. By forming the location 13a and installing the exhaust gas aftertreatment device 15 in the recess 13a, it is possible to improve the workability and maintenance workability of the exhaust gas aftertreatment device 15.

  As shown in FIG. 5, the hydraulic oil tank 13 is formed in a square shape in a plan view without forming a tapered surface on the side wall surface of the hydraulic oil tank. Even if the recess 13a is formed, the hydraulic oil tank 13 can sufficiently secure the necessary capacity.

  By forming the notch 12a in the corner portion of the fuel tank 12 adjacent to the recess 13a of the hydraulic oil tank 13, there is a further margin in the space above the rear wall surface of the hydraulic oil tank 13, and after the exhaust gas The mounting workability and maintenance workability of the processing apparatus 15 can be further improved.

  The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

  The exhaust gas aftertreatment device is installed in such a manner that the space above the wall surface is effectively utilized and the operation of the hydraulic excavator is not hindered while ensuring the necessary capacity of the hydraulic oil tank or the like. The present invention can also be applied to construction machines other than hydraulic excavators in which it is essential to improve the workability and maintenance workability of the gas aftertreatment device.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Lower traveling body 3 Upper revolving body 4 Cab 5 Boom 6 Arm 7 Bucket 8 Engine room 9 Diesel engine 10 Cooling fan 11 Heat exchanger 12, 21 Fuel tank 12a Notch 13, 22 Hydraulic oil tank 13a Recess 14 , 20 Support frame 15, 23 Exhaust gas aftertreatment device 16, 25 Muffler 17, 24 Exhaust pipe 18 Angle joint 19 Bolt

Claims (3)

  A diesel engine is used as a prime mover, and an exhaust device layout of a construction machine in which an exhaust gas aftertreatment device is installed in an exhaust system of the diesel engine, and a step is formed on a rear wall upper portion of a hydraulic oil tank arranged in parallel with a fuel tank. An exhaust device layout of a construction machine, wherein a recess having a required size is formed as a structure, and the exhaust gas aftertreatment device is installed in the recess.   The exhaust system layout for a construction machine according to claim 1, wherein the hydraulic oil tank is formed in a square shape in plan view. The exhaust device layout for a construction machine according to claim 1 or 2, wherein a cutout portion is formed in at least a portion of the fuel tank corresponding to the recess on the hydraulic oil tank side.

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