JP5684164B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine including a liquid reducing agent tank in which a liquid reducing agent is stored.

  In recent years, construction equipment such as hydraulic excavators equipped with diesel engines has been installed with exhaust gas treatment equipment in the exhaust system of diesel engines to meet higher-level exhaust gas regulations. Is released into the atmosphere through the NOx reduction catalyst provided in

  Conventionally, as this kind of exhaust gas treatment apparatus, a urea selective reduction type NOx treatment apparatus using a urea aqueous solution (liquid reducing agent) is often adopted, and the urea aqueous solution is stored in a metallic liquid reducing agent tank. Further, the liquid reducing agent tank is connected to the exhaust pipe by a liquid reducing agent supply pipe, and is configured so that the urea aqueous solution in the liquid reducing agent tank can be supplied to the exhaust pipe by the liquid reducing agent supply pump (for example, Patent Document 1).

JP 2003-20936 A

  By the way, when the liquid reducing agent tank is installed on the upper swing body, the space on the side of the boom support bracket may be used. That is, in some cases, it is arranged near the tool box on the right front part of the construction machine from the viewpoint of spatial constraints and ease of replenishment. However, when the liquid reducing agent tank is installed at such a position, it may be necessary to remove the liquid reducing agent tank itself when the boom foot pin is inserted or removed for maintenance or the like. In particular, in the configuration in which the filler is provided on the front side surface of the liquid reducing agent tank, the filler obstructs the boom foot pin insertion / removal operation, and thus the liquid reducing agent tank itself needs to be removed. Thereby, the problem that work man-hours increase arises.

  Accordingly, an object of the present invention is to provide a construction machine that enables the boom foot pin to be inserted and removed without having to remove the liquid reducing agent tank itself.

In order to achieve the above object, according to one aspect of the present invention, a boom support bracket having a hole for passing a boom foot pin in the width direction is provided at the front portion of the swivel frame , and a liquid in which a liquid reducing agent is stored. in the construction machine equipped with a tank for a reducing agent,
The liquid reducing agent tank is disposed in front of the fuel tank, and is located at a position lower than a front surface, a right side surface, and a hole for passing the boom foot pin in the width direction, which are disposed in the right front portion of the swivel frame. The liquid reduction device is disposed in the vicinity of the rear of the tool box including at least three surfaces including the upper surface, is disposed outside in the width direction with respect to the boom support bracket , and is disposed behind the hole of the boom support bracket. It is arranged so that the front side of the agent tank is located,
A front side surface of the liquid reducing agent tank is a filler for replenishing the liquid reducing agent tank with the liquid reducing agent, and extends forward from the front side surface of the liquid reducing agent tank. A construction machine is provided in which a filler is detachably attached above the upper surface of the tool box .

  According to the present invention, it is possible to obtain a construction machine capable of inserting and removing the boom foot pin without having to remove the liquid reducing agent tank itself.

It is a side view which shows the hydraulic shovel as an example of a construction machine. It is a top view which shows roughly the rear part of an upper revolving body by upper surface view. FIG. 5 is a perspective view schematically showing an installed state of a liquid reducing agent tank 70. It is a figure which shows roughly an example of the positional relationship of the filler 80 and the boom foot pin 90. FIG. 3 is a diagram illustrating an example of a preferable structure of a filler 80. FIG. It is explanatory drawing of the function of the filler 80 shown in FIG. It is a figure which shows the fillers 801 and 802 by another Example.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a side view showing a hydraulic excavator as an example of a construction machine.

  As shown in FIG. 1, an upper swing body 2 is mounted on the lower traveling body 1 so as to be swingable, and a cab 3 is provided on one front side of the upper swing body 2. In addition, the boom 4 is pivotally attached to the front center portion of the upper swing body 2 so that the boom 4 can be raised and lowered, and an arm 5 is connected to the distal end portion of the boom 4 so as to be rotatable up and down. A bucket 6 is attached so as to be rotatable up and down. The excavation attachment may be another attachment such as a breaker or a crusher.

  FIG. 2 is a plan view schematically showing the rear part of the upper swing body in a top view.

  As shown in FIG. 2, an engine room 7 is formed at the rear of the upper swing body 2, and a diesel engine 8 is installed in the engine room 7. A cooling fan 12 is provided in front of the diesel engine 8 (front side in FIG. 2), and a heat exchanger unit 13 including a radiator and the like is installed in front of the cooling fan 12.

  Further, an exhaust pipe 9 is connected to the diesel engine 8, and an exhaust gas treatment device 10 is installed on the downstream side of the exhaust pipe 9 in order to comply with higher-order exhaust gas regulations. As the exhaust gas treatment device 10, a urea selective reduction type NOx treatment device using an aqueous urea solution (liquid reducing agent) is adopted.

  FIG. 3 is a perspective view schematically showing an installed state of the liquid reducing agent tank 70.

  As shown in FIG. 3, a pair of left and right boom support brackets 17L, 17R are erected on the front portion of the swing frame 14 of the upper swing body 2. The boom support brackets 17L and 17R are provided with holes 172L and 172R for allowing the boom foot pins 90 (not shown in FIG. 3 and see FIG. 4) to pass therethrough. The boom foot pin 90 is passed through the holes 172L and 172R in the width direction W, and holds the boom 4 rotatably.

  A fuel tank 18 and a sump tank 19 are arranged in series on the rear side of the boom support bracket 17L. A liquid reducing agent tank 70 is disposed on the front side of the fuel tank 18. Accordingly, in the illustrated example, the liquid reducing agent tank 70, the fuel tank 18, and the sump tank 19 are arranged adjacently in order from the front. The order of the fuel tank 18 and the sump tank 19 is arbitrary. The fuel tank 18 and the sump tank 19 may be arranged side by side in the width direction. An aqueous urea solution is stored in the liquid reducing agent tank 70. Further, the liquid reducing agent tank 70 is connected to the exhaust gas treatment apparatus 10 via a liquid reducing agent supply pipe (not shown). The liquid reducing agent tank 70 is disposed such that the front side surface 70A is located behind the holes 172L and 172R of the boom support brackets 17L and 17R.

  A filler 80 for replenishing the liquid reducing agent is attached to the front side surface 70 </ b> A of the liquid reducing agent tank 70. The filler 80 is preferably attached below the upper surface level of the liquid reducing agent tank 70 as shown in FIG. This is to limit the maximum water level of the liquid reducing agent in the liquid reducing agent tank 70 when replenishing in consideration of expansion during freezing.

  The filler 80 extends in the front-rear direction of the construction machine. That is, the filler 80 has a predetermined length from the front side surface 70A of the liquid reducing agent tank 70 from the viewpoint of workability for replenishment. The filler 80 may be formed of a resin similarly to the liquid reducing agent tank 70, or may be formed of other materials.

  The filler 80 is detachably attached to the front side surface 70 </ b> A of the liquid reducing agent tank 70. The detachable attachment mode is optional, but is typically a screw type connection. In addition, a sliding type or a fitting type may be used.

  FIG. 4 is a diagram schematically showing an example of the positional relationship between the filler 80 and the boom foot pin 90, FIG. 4A is a side view, and FIG. 4B is a top view. In FIG. 4, the liquid reducing agent tank 70, the filler 80, and the boom foot pin 90 are hatched for easy understanding.

  In the example shown in FIG. 4, the filler 80 extends in the front-rear direction so as to overlap with the holes 172L, 172R of the boom support brackets 17L, 17R in a side view of the construction machine, as shown in FIG. Exists. That is, the filler 80 extends in the front-rear direction so as to overlap the boom foot pin 90 in a side view. Therefore, as shown in FIG. 4B, the filler 80 becomes an obstacle when the boom foot pin 90 is inserted and removed for attachment replacement or maintenance. That is, in FIG. 4B, the direction in which the boom foot pin 90 is pulled out is indicated by Z, but in this direction Z, the boom foot pin 90 is pulled out or in the direction opposite to the direction Z. When inserting 90, the filler 80 obstructs the operation of inserting and removing the boom foot pin 90.

  When the filler 80 is formed integrally with the liquid reducing agent tank 70 (for example, when the filler 80 is resin-molded integrally with the liquid reducing agent tank 70), when the boom foot pin 90 is inserted and removed. Therefore, it becomes necessary to remove the entire liquid reducing agent tank 70, which increases the number of work steps.

  On the other hand, according to the present embodiment, the filler 80 is detachably attached to the front side surface 70A of the liquid reducing agent tank 70. Therefore, when the boom foot pin 90 is inserted and removed, it is possible to prevent the filler 80 from obstructing the boom foot pin 90 by removing the filler 80. Thereby, workability | operativity of the insertion / extraction operation | work of the boom foot pin 90 improves. Further, it is not necessary to remove the entire liquid reducing agent tank 70, and the number of work steps can be reduced.

  FIG. 5 is a diagram illustrating an example of a preferable structure of the filler 80.

  The filler 80 may be composed of one piece, but preferably includes a main body portion 82 and a cap 84 as shown in FIG.

  The main body portion 82 is a hollow cylindrical body, and a male screw portion 82A is formed at an end portion on the liquid reducing agent tank 70 side. Further, the main body portion 82 has a female screw portion 82B at an end portion opposite to the liquid reducing agent tank 70 side (that is, an end portion on the cap 84 side). The female screw portion 82B is formed on a hollow inner peripheral surface. As described above, the male screw portion 82A is screwed to the attachment portion (female screw portion) 72 (see FIG. 6) formed on the front side surface 70A of the liquid reducing agent tank 70.

  The cap 84 is a solid cylindrical body, and a male screw portion 84A is formed at an end portion on the main body portion 82 side. The male screw portion 84A of the cap 84 is screwed to the female screw portion 82B of the main body portion 82. The male threaded portion 84A of the cap 84 can also be screwed to a mounting portion 72 (see FIG. 6) formed on the front side surface 70A of the liquid reducing agent tank 70. That is, the male screw portion 84A of the cap 84 has the same configuration (outer diameter, pitch, etc.) as the male screw portion 82A of the main body portion 82. The cap 84 has an enlarged diameter portion 84B at the end. Note that the length of the enlarged diameter portion 84B (length in the front-rear direction of the construction machine) is significantly shorter than the length of the main body portion 82.

  Of course, the relationship between the female screw portion and the male screw portion in the main body portion 82 and the cap 84 may be reversed. Further, not only the screwing method but also a fitting method such as a fitting method may be used.

  FIG. 6 is an explanatory diagram of the function of the filler 80 shown in FIG. 5, schematically showing the liquid reducing agent tank 70 and the filler 80 in a side view (the same view as FIG. 4A). .

  FIG. 6A shows a state in which the filler 80 is attached to the liquid reducing agent tank 70. When the filler 80 is removed from the state shown in FIG. 6 (A), the state shown in FIG. 6 (B) is obtained. In the state shown in FIG. 6B, the attachment portion 72 of the liquid reducing agent tank 70 is in a state (opened state) in which the inside of the liquid reducing agent tank 70 communicates with the outside. Accordingly, there is a possibility that foreign matters such as dust and dirt may enter the liquid reducing agent tank 70 when the boom foot pin 90 is inserted and removed. Therefore, when the boom foot pin 90 is inserted and removed, the cap 84 is attached to the attachment portion 72 of the liquid reducing agent tank 70 as shown in FIG. Thereby, it is possible to appropriately prevent foreign matter from entering the liquid reducing agent tank 70 when the boom foot pin 90 is inserted and removed. In addition, since the length of the cap 84 (particularly the length of the enlarged diameter portion 84B) is significantly shorter than the main body portion 82, the cap 84 does not interfere with the insertion / removal operation of the boom foot pin 90.

  FIG. 7 is a view showing fillers 801 and 802 according to other embodiments, and schematically showing the liquid reducing agent tank 70 and the fillers 801 and 802 in a side view (the same view as FIG. 4A). It is.

  In the example shown in FIG. 7A, the filler 801 is a two-stage filler. That is, the filler 801 is configured to be long by connecting two members in the longitudinal direction. The filler 801 may have a structure that detachably includes a cap 84 as shown in FIG. In the example shown in FIG. 7B, the filler 802 is a filler bent upward. The filler 802 may have a structure that removably includes a cap 84 as shown in FIG. Thus, the configuration (shape, length, etc.) of the filler may be arbitrary in consideration of replenishment workability.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, in the above-described embodiment, as shown in FIG. 4A, the filler 80 overlaps with the holes 172L and 172R of the boom support brackets 17L and 17R in the side view of the construction machine. Although extended, such a configuration is not necessarily required. Even if the filler 80 does not overlap with the holes 172L and 172R of the boom support brackets 17L and 17R, a relatively large space is required for the insertion and removal of the boom foot pin 90, and the filler 80 becomes an obstacle. Because there is. Therefore, if the filler 80 is attached to the front side surface 70 </ b> A of the liquid reducing agent tank 70, the above-described effect due to the fact that the filler 80 can be removed can be obtained.

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving body 3 Cab 4 Boom 5 Arm 6 Bucket 7 Engine room 8 Diesel engine 9 Exhaust pipe 10 Exhaust gas treatment device 12 Cooling fan 13 Heat exchanger unit 14 Turning frame 17L, 17R Boom support bracket 172L, 172R Hole 18 Fuel tank 19 Sump tank 70 Liquid reducing agent tank 70A Side surface 72 Mounting portion 80, 801, 802 Filler 82 Main body portion 82A Male thread portion 82B Female thread portion 84 Cap 84B Male thread portion 90 Boom foot pin

Claims (4)

Provided with a boom support bracket having a hole for the passage of the boom foot pin in the width direction in a front portion of the revolving frame, the construction machine liquid reducing agent comprises a tank for a liquid reducing agent is stored,
The liquid reducing agent tank is disposed in front of the fuel tank, and is located at a position lower than a front surface, a right side surface, and a hole for passing the boom foot pin in the width direction, which are disposed in the right front portion of the swivel frame. The liquid reduction device is disposed in the vicinity of the rear of the tool box including at least three surfaces including the upper surface, is disposed outside in the width direction with respect to the boom support bracket , and is disposed behind the hole of the boom support bracket. It is arranged so that the front side of the agent tank is located,
A front side surface of the liquid reducing agent tank is a filler for replenishing the liquid reducing agent tank with the liquid reducing agent, and extends forward from the front side surface of the liquid reducing agent tank. A construction machine, wherein a filler is detachably attached above the upper surface of the tool box .   The construction machine according to claim 1, wherein the filler extends in the front-rear direction so as to overlap with a hole of the boom support bracket in a side view of the construction machine.   The construction machine according to claim 1, wherein the filler is a screw type and is attached to an attachment portion on a front side surface of the liquid reducing agent tank. The filler includes a cap at an end opposite to the liquid reducing agent tank side,
The construction machine according to claim 3, wherein the cap can be attached to the same attachment portion as the filler by a screw type or a fitting type.

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