JP2023005326A - Work machine - Google Patents

Abstract

To provide a support structure suitable for piping connecting a supercharger and an intercooler in a limited inner space of a building for a work machine.SOLUTION: A work machine includes: a self-travelable lower traveling body (2); and an upper revolving body (3) rotatably attached on the lower traveling body, wherein the upper revolving body includes: a building (8) configured to form a skeleton using a plurality of support members (20a, 20b, 20c); an engine (9), a supercharger (17), and an intercooler (11a) arranged in the building; and an intercooler piping (25) connecting the supercharger and the intercooler. The work machine includes a bracket (30) attached to at least one of the plurality of support members and supports the intercooler piping.SELECTED DRAWING: Figure 6

Description

TECHNICAL FIELD The present invention relates to a working machine such as a hydraulic excavator, and more particularly to a support structure for piping in an engine room.

In general, a hydraulic excavator as a working machine includes a self-propelled undercarriage, an upper revolving body rotatably mounted on the undercarriage, and a front side of the upper revolving body that can be raised and lowered. and a working device. An engine building (building) is provided in the upper revolving body, and the engine is mounted in this building. Various pipes are routed around the engine, and these pipes are supported by supports.

For example, Patent Document 1 describes a configuration in which an air cleaner and a turbocharger are connected via an intake pipe and an air hose, and the intake pipe and air hose are supported by a support plate. More specifically, the intake pipe and the air hose are connected via an intake pipe relay, and the intake pipe relay is fixed to the support plate.

Japanese Patent No. 4235011

An intercooler is installed between the engine and the turbocharger, and how to support the piping that connects the turbocharger and the intercooler (intercooler piping) in the limited internal space of the building is important. However, Patent Literature 1 makes no mention of a support structure for the pipe that connects the supercharger and the intercooler.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a suitable support structure for piping that connects a supercharger and an intercooler in a limited internal space of a building of working machines.

In order to achieve the above object, one aspect of the present invention includes a self-propelled undercarriage and an upper swinging body attached to the undercarriage so as to be able to swivel, wherein the upper swinging body has a plurality of an engine, a supercharger and an intercooler arranged in the building, and an intercooler pipe connecting the supercharger and the intercooler. The machine is characterized by comprising a bracket attached to at least one of the plurality of support members and supporting the intercooler piping.

ADVANTAGE OF THE INVENTION According to this invention, the suitable support structure of the piping which connects a supercharger and an intercooler in the limited internal space of a building can be provided. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

1 is a side view of a hydraulic excavator that is a typical example of a working machine according to the present invention; FIG. FIG. 4 is a plan view of the upper revolving body with the top panel removed; It is the figure which looked at the principal part inside an engine building from the back. It is the figure which looked at the principal part inside an engine building from upper direction. FIG. 4 is a top view of the essential parts inside the engine building, showing a state in which the bracket is removed; It is the perspective view which looked at the principal part inside an engine building from the left rear. FIG. 4 is a perspective view of the main part inside the engine building as seen from the rear left, showing a state in which the bracket is removed; FIG. 5 is a cross-sectional view showing a main part taken along line AA of FIG. 4; FIG. 4 is an exploded view showing details of a bracket and intercooler piping; It is a figure which shows the modification of the attachment structure of a bracket.

An embodiment of a working machine according to the present invention will be described with reference to the drawings. FIG. 1 is a side view of a hydraulic excavator 1, which is a representative example of a working machine according to the present invention. Note that front, back, left, and right in this specification are based on the viewpoint of an operator who operates the hydraulic excavator 1 on board, unless otherwise specified.

A hydraulic excavator 1 includes a lower traveling body 2 and an upper revolving body 3 supported by the lower traveling body 2 . The lower running body 2 and the upper swing body 3 are an example of a vehicle body. The lower traveling body 2 has a pair of left and right crawlers. When the rotation of a traveling motor (not shown) is transmitted to rotate the pair of left and right crawlers, the hydraulic excavator 1 travels. However, the undercarriage 2 may be of a wheeled type instead of the crawler.

The upper revolving body 3 is supported by the lower traveling body 2 so as to be able to revolve. The driving force of a turning motor (not shown) is transmitted to the upper turning body 3 to turn it with respect to the lower traveling body 2 . The upper revolving body 3 includes a revolving frame 5 serving as a base, a front working machine 4 attached to the center of the front end of the revolving frame 5 so as to be capable of rotating in the vertical direction, and a cab (operating machine) disposed on the front left side of the revolving frame 5 . A seat 7 , a counterweight 6 arranged at the rear end of the revolving frame 5 , and an engine building 8 (building) supported by the revolving frame 5 between the cab 7 and the counterweight 6 .

The front working machine 4 includes a boom 4a supported by the upper revolving body 3 so as to be able to rise and fall, an arm 4b supported swingably at the tip of the boom 4a, and a bucket supported swingably at the tip of the arm 4b. 4c, and hydraulic cylinders 4d, 4e, 4f that drive boom 4a, arm 4b, and bucket 4c. The counterweight 6 is for balancing the weight with the front work machine 4, and is a heavy object having an arc shape when viewed from above.

The cab 7 has an internal space where an operator who operates the hydraulic excavator 1 rides. Inside the cab 7 are arranged a seat (not shown) on which an operator sits, and operating devices (a steering wheel, pedals, levers, switches, etc.) operated by the operator seated on the seat. When an operator riding in the cab 7 operates the operation device, the lower traveling body 2 travels, the upper revolving body 3 revolves, and the front working machine 4 operates.

The engine building 8 is supported by the revolving frame 5 behind the front working equipment 4 and the cab 7 and ahead of the counterweight 6 . The engine building 8 has an internal space surrounded by a top panel 8T, a pair of left and right side panels 8L and 8R, and a rear panel 8B. More specifically, the top panel 8T defines the top surface of the interior space, the side panel 8L defines the left surface of the interior space, the side panel 8R defines the right surface of the interior space, and the rear panel 8B defines the rear surface of the interior space. define.

FIG. 2 is a plan view of the upper rotating body 3 with the top panel 8T removed. In the internal space of the engine building 8, components for operating the hydraulic excavator 1 (engine 9, aftertreatment device 10, heat exchanger 11, cooling fan 12, cooling water tank 13, hydraulic pump 14, supercharger 17, etc.) are accommodated. The swing frame 5 also supports a hydraulic oil tank 15 and a fuel tank 16 outside the engine building 8 .

The engine 9 is arranged to the right of the heat exchanger 11 and the cooling fan 12 , to the left of the aftertreatment device 10 and the hydraulic pump 14 , and below the cooling water tank 13 . The engine 9 generates driving force for operating the excavator 1 (more specifically, the cooling fan 12 and the hydraulic pump 14). In the present embodiment, the air compressed by the supercharger 17 and cooled by the heat exchanger 11 (intercooler 11a) is supplied to the engine 9 .

The aftertreatment device 10 is arranged to the right of the engine 9 . The aftertreatment device 10 purifies and discharges the exhaust gas discharged from the engine 9 . The aftertreatment device 10 removes NOx, NO, CO, HC, etc. from the exhaust gas, for example.

The heat exchanger 11 is arranged to the left of the cooling fan 12 . The heat exchanger 11 includes a radiator 11b that exchanges the cooling water that has cooled the engine 9 with the cooling air generated by the cooling fan 12 and supplies the cooling water to the engine 9 again. In the present embodiment, the heat exchanger 11 includes an intercooler 11a that cools air compressed by a supercharger (turbocharger) 17, an oil cooler 11c that cools hydraulic oil stored in the hydraulic oil tank 15, and the like. is composed of

The cooling fan 12 is arranged to the right of the heat exchanger 11 , to the left of the engine 9 and below the cooling water tank 13 . The cooling fan 12 is rotated by the driving force of the engine 9 to generate cooling air in the engine building 8 . Although not shown in FIG. 2, the space above the cooling fan 12 is entirely covered with a bracket 30, which will be described later.

A cooling water tank (expansion tank) 13 is arranged to the right of the cooling fan 12 and above the engine 9 . The cooling water tank 13 stores part of the cooling water circulating between the engine 9 and the heat exchanger 11 . A cap is attached to the upper surface of the cooling water tank 13 to close an opening for replenishing the cooling water.

The hydraulic pump 14 is arranged to the right of the aftertreatment device 10 . Hydraulic pump 14 supplies hydraulic fluid stored in hydraulic fluid tank 15 to hydraulic actuators (travel motor, swing motor, hydraulic cylinders 4d, 4e, 4f) by transmission of driving force of engine 9 . As a result, the lower traveling body 2 travels, the upper revolving body 3 revolves, and the front working machine 4 operates.

The hydraulic oil tank 15 is arranged to the right of the front working machine 4 , forward of the engine building 8 , and rearward of the fuel tank 16 . The hydraulic oil tank 15 stores hydraulic oil to be supplied to the hydraulic actuators. The fuel tank 16 is arranged to the right of the front work implement 4 and forward of the hydraulic oil tank 15 . Fuel to be supplied to the engine 9 is stored in the fuel tank 16 .

Inside the engine building 8, a heat exchanger 11, a cooling fan 12, an engine 9, an aftertreatment device 10, and a hydraulic pump 14 are arranged in this order from left to right. Also, the cooling water tank 13 is arranged above the engine 9 and the cooling fan 12 . That is, inside the engine building 8, components for driving the hydraulic excavator 1 are arranged three-dimensionally. These components require maintenance (for example, replenishment of cooling water to the cooling water tank 13, replacement of engine oil, etc.).

Next, details of the internal configuration of the engine building 8 will be described with reference to FIGS. 3 to 8. FIG. 3 is a view of the essential parts inside the engine building 8 seen from the rear, FIG. 4 is a view of the essential parts inside the engine building 8 seen from above, and FIG. 5 is a view of the essential parts inside the engine building 8 seen from above. FIG. 6 is a perspective view of the essential parts inside the engine building 8 as seen from the left rear, and FIG. 7 is the essential parts inside the engine building 8 left rear 8 is a perspective view showing a state in which the bracket 30 is removed, and FIG. 8 is a cross-sectional view taken along line A--A in FIG. 4 to show the essential parts.

The engine building 8 has a framework formed by building supports 20a, 20b, and 20c, which are support members. As shown in FIGS. 4 and 6, the building supports 20a and 20b extend in the left-right direction, and the building support 20c extends in the front-rear direction so as to connect the left ends of the building supports 20a and 20b. extended. Further, the building supports 20a, 20b, and 20c are supported by members (not shown) that constitute columns. By surrounding this framework with a top panel 8T, a pair of left and right side panels 8L and 8R, and a rear panel 8B, an internal space is formed in the engine building 8 to accommodate the engine 9, the heat exchanger 11, and the like. be done. 3 and 6 denotes a building support cover provided on the side of the building support 20a.

Various pipes and hoses are routed around the engine 9 . Specifically, an engine intake duct 26, an intercooler pipe 25, an intercooler hose 27, a radiator hose 28, and the like are arranged around the engine 9, as shown in FIG.

The supercharger 17 and the intercooler 11 a are connected by an intercooler pipe 25 and an intercooler hose 27 . More specifically, the intercooler pipe 25 has one end portion 25a, an oblique pipe portion 25b, a straight pipe portion 25c, and the other end portion 25d, and is three-dimensionally bent as a whole. It has a shape (see FIGS. 5 and 7). One end 25a is connected to the supercharger 17, and the other end 25d is connected to the intercooler hose 27. As shown in FIG. As a result, the air heated by the supercharger 17 flows through the intercooler pipe 25 and the intercooler hose 27, is cooled by the intercooler 11a, and is supplied to the engine 9 through a pipe (not shown).

Further, as shown in FIGS. 4 and 6, the intercooler pipe 25 is routed in a space above the engine 9 so as to avoid the engine oil filler port 9a of the engine 9. As shown in FIGS. Therefore, when replacing the engine oil, the intercooler pipe 25 does not interfere with pulling upward the cap inserted into the engine oil filling port 9a.

Intercooler pipe 25 is supported by bracket 30 . FIG. 9 is an exploded view showing details of the bracket 30 and the intercooler piping 25. As shown in FIG. As shown in FIG. 9, the bracket 30 is formed by bending a plate-like member substantially at a right angle, and has an upper surface portion 31 and a side surface portion 32. As shown in FIG. The upper surface portion 31 is provided with four holes 34 for inserting two U-bolts 40 and two holes 36 for fixing the bracket 30 to the building support 20c. Furthermore, a notch (recess) 33 is provided in the upper surface portion 31 . This notch 33 is for avoiding interference with the intercooler hose 27 and radiator hose 28 (see FIG. 6). Also, the side portion 32 is provided with two holes 35 for fixing the bracket 30 to the building support 20a.

Brackets 30 are fixed directly to building support 20a and building support 20c. Specifically, the side portion 32 of the bracket 30 is fixed to the building support 20a with two bolts 43 (see FIGS. 4 and 6). Further, the upper surface portion 31 of the bracket 30 is fixed with two bolts 42 to the fixing piece 21 (see FIGS. 5, 7 and 8) attached to the building support 20c. The bracket 30 entirely covers the upper part of the cooling fan 12 when fixed to the building supports 20a and 20c (see FIGS. 4 to 7). Therefore, access to the cooling fan 12 is restricted unless the bracket 30 is removed. In other words, the bracket 30 completely closes the access path to the cooling fan 12 from above so that the operator cannot touch the cooling fan 12 unless the bracket 30 is removed.

As shown in FIGS. 6, 9, etc., the intercooler pipe 25 is arranged below the bracket 30 and supported by the bracket 30 with two U-bolts 40 and eight nuts 41. As shown in FIG. More specifically, the U-bolt 40 is brought into contact with the intercooler pipe 25 from below, and the head (both ends) of the U-bolt 40 is passed through the hole 34 of the bracket 30 to the upper surface side. The intercooler pipe 25 is fixed to the lower surface side of the bracket 30 by fastening to the U bolt 40 from the upper surface side of the bracket 30 . In addition, although the nuts 41 are fastened two by two to the U-bolt 40 to form a double nut, they may be a single nut.

According to this embodiment configured in this manner, the following effects can be obtained, for example.

The intercooler pipe 25 is directly supported by the building supports 20a, 20c via brackets 30. As shown in FIG. On the other hand, the engine 9 is not directly supported by the building supports 20a, 20c. In other words, the vibration system of the intercooler pipe 25 and the vibration system of the engine 9 are independent. Therefore, resonance between the intercooler pipe 25 and the engine 9 is prevented. If the intercooler pipe 25 is supported by a bracket provided on the engine 9, since the intercooler pipe 25 and the engine 9 have a common vibration system, a special design is required to prevent resonance. However, with the configuration of this embodiment, such a design becomes unnecessary.

Moreover, since the bracket 30 entirely covers the space above the cooling fan 12, it is possible to prevent the operator from accidentally touching the cooling fan 12 during operation. Therefore, safety is also improved.

Furthermore, by providing a notch 33 in the bracket 30 and allowing the intercooler hose 27 and the radiator hose 28 to pass through the notch 33, interference between the bracket 30 and each hose 27, 28 is prevented. , the bracket 30 can be placed at a lower position. As a result, the height dimension of the engine building 8 can be kept lower. Further, since the lower side of the bracket 30 can be visually recognized through the notch 33, it is easy to visually inspect the inside.

In addition, since the nut 41 is provided on the upper surface of the bracket 30, the bracket 30 can be easily removed, improving maintainability.

Thus, according to this embodiment, the intercooler piping 25 can be favorably supported by the bracket 30 in the limited internal space of the engine building 8 .

It should be noted that providing a plurality of holes in the upper surface portion 31 of the bracket 30 is preferable because the flow of the cooling air generated by the cooling fan 12 becomes smoother.

<Modification>
10A and 10B are diagrams showing a modification of the mounting structure of the bracket 30. FIG. Note that FIG. 10 is a view seen from the same direction as FIG. As shown in FIG. 10, in this modification, a vibration isolator 50 is provided between the bracket 30 and the fixed piece 21 of the building support 20c. This modification is effective when the vibration of the intercooler pipe 25 is large because the rubber vibration isolator 50 can suppress the vibration transmitted from the bracket 30 to the building support 20c.

In the above-described embodiment, the hydraulic excavator 1 including the crawler-type undercarriage 2 has been described as an example of the work machine. However, the present invention is not limited to this, and may be applied to, for example, a hydraulic excavator equipped with a wheel-type undercarriage. In addition, it can be widely applied to other working machines such as wheel loaders, dump trucks, hydraulic cranes, and the like.

Moreover, the above-described embodiments are examples for explanation of the present invention, and are not intended to limit the scope of the present invention only to those embodiments. Those skilled in the art can implement the invention in various other forms without departing from the spirit of the invention.

1 Hydraulic excavator (work machine)
2 lower running body 3 upper revolving body 4 front working machine 8 engine building (building)
8B rear panel 8L, 8R side panel 8T top panel 9 engine 9a engine oil filler port 11 heat exchanger 11a intercooler 11b radiator 11c oil cooler 12 cooling fan 13 cooling water tank 17 supercharger (turbocharger)
20a, 20b, 20c Building support (support member)
21 Fixed piece 22 Building support cover 25 Intercooler pipe 25a One end 25b Oblique pipe 25c Straight pipe 25d Other end 26 Engine intake duct 27 Intercooler hose 28 Radiator hose 30 Bracket 31 Top plate 32 Side plate 33 Notch 34, 35 Hole 40 U-bolt 41 Nut 42 Bolt 43 Bolt 50 Anti-vibration rubber

Claims (5)

a self-propellable undercarriage, and an upper revolving body rotatably attached to the undercarriage,
The upper revolving body is
a building whose framework is formed by a plurality of support members;
An engine, a supercharger, and an intercooler arranged in the building;
A work machine including an intercooler pipe that connects the supercharger and the intercooler,
A working machine comprising a bracket attached to at least one of the plurality of support members and supporting the intercooler pipe. The work machine according to claim 1,
A working machine, wherein an anti-vibration rubber is provided between the bracket and the support member to which the bracket is attached. In the working machine according to claim 1 or 2,
further comprising a cooling fan that is driven by the engine and draws cooling air into the building;
A working machine, wherein the bracket is provided to cover a space above the cooling fan so that access to the cooling fan from above is restricted. In the working machine according to any one of claims 1 to 3,
The intercooler pipe is arranged on the lower side of the bracket and fixed to the bracket via a U-bolt and a nut,
A working machine, wherein the U-bolt is arranged on the lower side and the nut is arranged on the upper side across the bracket. In the working machine according to claim 4,
The bracket is provided with a notch,
A working machine, wherein an intercooler hose connecting the intercooler and the intercooler pipe is arranged inside the notch.

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