JP2003003517A - Engine room structure of construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine room structure of construction machinery, which enables the arrangement of pipes for connections between an engine and instruments such as an after-cooler and an air cleaner without decreasing the cooling efficiency of the engine and coolers such as a radiator and an oil cooler or decreasing easiness of maintenance work for the engine, etc., when the instruments are additionally arranged ahead of the coolers. SOLUTION: With regard to at least one 21 of paired bulkheads 20 and 21 between which an engine unit 16 is sandwiched, a lower part 21a of the bulkhead 21 is arranged in close vicinity to the engine unit 16; an upper part 21b thereof is formed in such a manner as to be separated from the engine unit 16; the pipes 17b and 18a, which connect the engine 4 with the instruments 17 and 18 arranged ahead of the cooler 10, are laid between the upper part 21b and the engine unit 16; and a step 25, which is extended from a deck 2c to the engine unit 16, is installed at an upper end of the bulkhead 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an engine room of a construction machine such as a hydraulic excavator, a wheel loader, a crane, etc. Relates to the structure of the engine room where equipment such as aftercoolers and air cleaners are located.

[0002]

2. Description of the Related Art Today, traveling construction machines such as hydraulic excavators and self-loaders, stationary construction machines such as cranes,
Various construction machines are used in various fields such as construction sites, ports and factories. The structure of these construction machines is
For example, in a hydraulic excavator which is a traveling type construction machine, FIG.
As shown in FIG. 1, a lower traveling body 101, an upper revolving body 102 rotatably arranged above the lower traveling body 101, and a working device 10 provided on the upper revolving body 102 for performing various operations.
3 and 3. Of these, devices such as an engine 104 and a hydraulic pump 105 are arranged in the upper swing body 102, and the working device 103 is operated by the hydraulic pressure generated by the drive of the hydraulic pump 105 by the engine 104.

Construction machines are generally used in severe environments such as excavation of rocks in dams, tunnels, rivers, roads, etc., and demolition of buildings and buildings. Under such environments, the engine 104 and the hydraulic pump 105 are used. It is easy to cause an increase in engine temperature and hydraulic oil temperature due to the high load applied to such devices. Therefore, in these construction machines, a relatively large-capacity radiator or oil cooler (hereinafter, collectively referred to as a cooler) is provided in the flow path of the cooling air generated by the fan of the engine 104, and these coolers cool the engine. Cooling water or hydraulic oil.

In the conventional hydraulic excavator, the engine room is formed inside the upper swing body 102, and the hydraulic pump 1
Engine 104 to which 05 is connected is counterweight 1
06 and the operator room 107 are arranged horizontally. Partition walls 109A and 109B are provided on both sides of the engine 104 (front side and rear side of the machine body).
The fan 104a and the coolers (radiators and oil coolers) 110A and 110 are provided in the space sandwiched between 9A and 109B.
B is arranged in series with the engine 104 to form an engine unit 111. The partition walls 109A and 109B are channels 11 for cooling air generated by the rotation of the fan 104a.
3 is formed, and the cooling air flows in the flow path 113 as indicated by the arrow in the figure, so that each cooler 110
A, 110B and the engine 104 are sequentially cooled.

[0005]

By the way, the engine is provided with an air cleaner for purifying intake air. Generally, the air cleaner is arranged in an empty space in the engine room, but the space available for the air cleaner is gradually decreasing due to the recent compact body. Therefore, depending on the aircraft,
As shown in FIG. 3, the air cleaner 1 is used by utilizing the space between the coolers 110A and 110B and the side door 102b for inspection.
Some have 12 arranged.

The air cleaner 112 is connected to an intake pipe of the engine 104 by a pipe 112a. Therefore, when the air cleaner 112 is arranged at the above position, the pipe 112a is arranged so as to bypass the coolers 110A and 110B and the fan 104a. In this case, it is easy to widen the space between the one partition wall 109B and the engine unit 111 and insert the pipe 112a into the gap.
It is possible to pass through.

However, if the gap between the partition wall 109B and the engine unit 111 is widened in this way, the flow passage area increases and the flow rate of the cooling air per unit area decreases, which cools the coolers 110A and 110B and the engine 104. The efficiency will decrease. Further, the partition wall 109B on the operator room 107 side is connected to the work deck 102c on the upper surface of the machine body. However, when the gap with the engine unit 111 is widened in this way, the work deck 102c moves to the engine 10
It becomes difficult to perform maintenance such as 4.

Further, in recent years, construction machines tend to be equipped with an engine equipped with an aftercooler in order to improve exhaust gas performance. The aftercooler is a cooler for the supercharged air supplied to the engine, is provided between the supercharger and the intake pipe of the engine, and suppresses the temperature rise of the intake air due to the supercharge and lowers the combustion temperature. NO by
It has a function of suppressing the generation of x. The aftercooler mounted on the construction machine is generally an air-cooled type, and therefore is additionally arranged in the cooling air flow path together with the radiator and the oil cooler.

A pipe connected to the intake pipe of the engine and a pipe connected to the supercharger are connected to the aftercooler, but since the aftercooler is usually arranged in front of the core portion of the radiator or the oil cooler, these pipes are connected. Like the above-mentioned intake pipe of the air cleaner, it is also arranged to bypass the radiator, the oil cooler, and the fan. Therefore, as in the case of the air cleaner, the above-mentioned problems also occur when the aftercooler is arranged.

The present invention was devised in view of the above problems, and in the case of further arranging equipment such as an aftercooler and an air cleaner in front of a cooler such as a radiator and an oil cooler, the cooling efficiency of the cooler and the engine. It is an object of the present invention to provide an engine room structure for a construction machine, which makes it possible to connect a pipe connecting these devices to an engine without lowering the engine performance or the ease of maintenance work on the engine and the like. And

[0011]

According to the present invention, there is provided an engine unit in which a cooler of at least one of a radiator and an oil cooler, a fan and an engine are arranged in series.
It is provided with a device connected to the engine through a pipe and a pair of partition walls sandwiching the engine unit, and the pair of partition walls form a flow path of cooling air generated by a fan, and the upper end of at least one partition wall. The section is for achieving the above object in the engine room structure of the construction machine, which is connected to the deck on the upper surface of the machine body.

That is, according to the present invention, the lower portion of the one partition wall is arranged closer to the engine unit, while the upper portion thereof is formed to be separated from the engine unit more than the lower portion. The pipe is arranged in a space formed between the engine unit and the engine unit, and a step extending from the deck toward the engine unit is provided in a part of an upper end portion of the one partition wall. There is. With such a configuration, it is possible to minimize the increase in the flow passage area associated with the piping of the pipe and suppress the decrease in the cooling efficiency of the cooler and the engine, and by using the steps as scaffolding, the maintenance work of the engine etc. can be facilitated. Become.

Examples of equipment connected to the engine through the pipe include an aftercooler and an air cleaner. These equipments are connected to the engine by air pipes, but since air pipes are thicker than other pipes, especially when these aftercoolers and air cleaners are arranged in front of radiators and oil coolers, By providing these air pipes to the above, the effect becomes particularly remarkable.

As a method of installing the step, it is preferable that a bracket is fixed to the wall surface of the one partition wall and the step is attached to the bracket so that the wall surface can support the step. With such an installation method, it becomes possible to sufficiently secure the strength of the steps with a simple structure.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an engine room structure of a construction machine as an embodiment of the present invention. INDUSTRIAL APPLICABILITY The present invention can be applied to various construction machines such as hydraulic excavators, wheel loaders, bulldozers, and cranes regardless of traveling type or stationary type. Here, as an example, the present invention is applied to an engine room of a hydraulic excavator which is one type of construction machines. The case will be described.

First, FIG. 1 is a schematic plan view of an upper revolving structure 2 of a hydraulic excavator according to this embodiment, as viewed from above. Here, a state in which a part of the cover such as the engine hood is removed is shown. As shown in FIG. 1, an engine room is formed between an operator room 7 provided at the front end portion of the upper swing body 2 and a counterweight 6 provided at the rear end portion thereof, and the hydraulic pump 5 is provided in the engine room. The engine 4 to which is connected is arranged horizontally. And
The radiator 10 is arranged in series in front of the first fan 4a driven by the engine 4, and a pair of partition walls 20 and 21 are provided so as to sandwich the engine unit 16 including the engine 4, the fan 4a and the radiator 10. . These partition walls 20 and 21 form a flow path (first cooling air flow path) 13 for cooling air generated by the rotation of the first fan 4a, and the cooling air flows inside the first cooling air flow path 13 in the drawing. The radiator 10 and the engine 4 are sequentially cooled by flowing as indicated by the arrow. A partition wall connecting the two partition walls 20 and 21 is provided behind the engine 4 so as to partition the space in which the engine 4 is arranged and the space in which the hydraulic pump 5 is arranged.

The partition wall 21 forming the first cooling air flow path 13 and the partition wall 2 provided at the rear of the operator chamber 6
A second fan 12a driven by a motor 12 and an oil cooler 11 are arranged between the two. The pair of partition walls 21 and 22 that sandwich the oil cooler 11 are the second fan 1
A flow path (second cooling air flow path) 14 of cooling air generated by the rotation of 2a is formed, and the cooling air flows in the second cooling air flow path 14 as indicated by an arrow in the figure, The oil cooler 11 is designed to be cooled.

Further, in this embodiment, the aftercooler 17 is arranged in front of the engine unit 16, specifically, in front of the radiator 10, and the aftercooler 17 is further provided.
An air cleaner 18 is arranged in the space between the openable and closable side door 2b. Aftercooler 17,
The pipe 17b connected to the intake pipe of the engine 4 and the engine 4
The pipe 17a (see FIG. 2) connected to the supercharger 4b is connected, and the air cleaner 18 is connected to the pipe 18a connected to the supercharger 4b. These pipes 17a, 1
7b and 18a are the engine unit 16 and the central partition wall 2
It is connected to the engine 4 through the space between the engine 1 and the engine 1.

Here, FIG. 2 is a schematic view of the II-II cross section of FIG. 1, and the pipe 1 between the engine 4 and the partition wall 21.
The piping states of 7a, 17b, and 18a are specifically shown. As shown in FIG. 2, the partition wall 21 at the center is the floor surface 2a.
A lower part 21a that is substantially perpendicular to the lower part 21a, and an upper part 2 that is bent so as to be separated from the engine 4 toward the front of the machine body with respect to the lower part 21a
1b and. Between the lower portion 21a of the partition wall 21 and the engine 4, a space similar to the space between the partition wall and the engine in the conventional hydraulic excavator is secured together with the partition wall 20 on the counter weight 6 side and the engine 4. ing. On the other hand, between the upper portion 21b of the partition wall 21 and the engine 4, since the upper portion 21b of the partition wall 21 is bent toward the front side of the vehicle body, a space much wider than the space in the lower portion 21a of the partition wall 21 is secured. .

In the wide space secured between the upper portion 21b of the partition wall 21 and the engine 4, the pipe 17a,
Of 17b and 18a, a pipe 17b and a pipe 18a are provided. In particular, the pipe 18a for the air cleaner 18 having a large diameter is laid at a position where the upper portion 21b of the partition wall 21 and the engine 4 are most distant from each other. in this way,
Only the upper part 21b of the partition wall 21 is formed so as to be separated from the engine 4, and the large-diameter pipes 17b and 18a are piped there, so that the lower part 21a of the partition wall 21 is arranged close to the engine 4 as in the conventional case. Therefore, it is possible to suppress the decrease in the cooling efficiency of the engine 4 by minimizing the increase in the flow passage area of the cooling air.

The first pipe 17a is provided in the gap between the lower portion 21a of the partition wall 21 and the engine 4, more specifically, the cylinder block portion of the engine 4. The width of the cylinder block portion is narrower than that of the cylinder head portion in which the other pipes 17b and 18a are arranged. This is because it is possible to secure a space for piping 17a. However, since various accessories are attached to the engine 4, it is not always possible to secure a space for piping the pipe 17a between the lower portion 21a of the partition wall 21 and the cylinder block portion of the engine 4. . In this case, this pipe 17a, together with the other pipes 17b and 18a, also forms the upper portion 21 of the partition wall 21.
It will be connected between b and the engine 4.

By the way, the upper end of the central partition wall 21 is connected to the work deck 2c on the upper surface of the machine body as shown in FIGS. The work deck 2c is a scaffold on which the worker performs various works, and normally, maintenance work such as cleaning and repair of the engine 4 is also performed from the work deck 2c. However, if the upper portion 21b of the partition wall 21 is bent and formed so as to be separated from the engine 4 on the front side of the machine body as described above, the distance from the work deck 2c to the engine 4 becomes long, which makes maintenance work difficult. It can't be done easily.

Therefore, the central partition wall 21 is provided with a step 25 extending from the work deck 2c to the engine 4 side as shown in FIG. 1 and FIG. 3 which is a schematic view of the III-III section thereof. Here, in step 25, the engine 4
It is installed using an empty space between the muffler 4c near the rear end and the supercharger 4b. The step 25 has a rectangular shape and is formed to have a size such that at least one foot of an operator can be accommodated therein. By using this step 25 as a scaffold, maintenance work for the engine 4 and the like can be easily performed.

The installation method of step 4 will be described. As shown in FIGS.
Two brackets 26A and 26B extending obliquely upward toward the engine 4 side are fixed to the wall surface of 1a by welding, and the wall surface (vertical surface) of the upper portion 21b of the partition wall 21 is horizontal toward the engine 4 side. 2 brackets that extend to
7A and 27B are fixed by welding. Step two
5 is these brackets 26A, 26B, 27A, 27
It is fixed to B with four bolts 28. As a result, the load applied to step 25 is reduced by the bracket 26A,
It can be received by the wall surface of the partition wall 21 via 26B, 27A and 27B.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be carried out without departing from the spirit of the present invention. . For example, in the above-described embodiment, the pipe connected to the aftercooler and the pipe connected to the air cleaner are piped between the central partition and the engine unit, but only the pipe connected to the aftercooler or the air cleaner. You may install only the pipe connected. When another device is arranged in front of the radiator, a pipe connecting the other device and the engine may be provided between the central partition wall and the engine unit. Further, even when another device is arranged in front of the oil cooler, a pipe connecting the other device and the engine may be provided between the central partition wall and the engine unit.

The shape of the central partition wall is not limited to the shape described in the above embodiment, and the upper portion should be separated from the engine unit more than the lower portion so that a pipe can be piped at least to the engine unit. It only needs to be formed. Further, the shape of the steps, the installation method, and the installation position described in the above embodiment are merely examples.
It is not limited to this. Therefore, it is of course possible to provide a plurality of steps.

Further, in the above-mentioned embodiment, the example in which the present invention is applied to the hydraulic excavator of the type in which the oil cooler is separated from the engine and the radiator has been described, but the oil cooler is arranged in series with the engine together with the radiator. Of course, it can be applied to a hydraulic excavator of a type.

[0028]

As described above in detail, according to the engine room structure of the construction machine of the present invention, the pipe is arranged between the upper part of the partition formed so as to be separated from the engine unit and the engine unit. At the same time, since a step extending from the deck toward the engine unit is provided at a part of the upper end of this partition wall, the increase in the flow passage area due to the piping of the pipe is minimized to improve the cooling efficiency of the cooler and the engine. There is an advantage that the deterioration can be suppressed and the engine and the like can be easily maintained by using the steps as a scaffold.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a configuration of an engine room of a hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is a schematic view showing a II-II cross section of FIG.

FIG. 3 is a schematic diagram showing a cross section taken along the line III-III in FIG.

FIG. 4 is a perspective view showing a step installation method according to an embodiment of the present invention.

FIG. 5 is a schematic plan view showing a configuration of a conventional hydraulic excavator.

[Explanation of symbols]

2 Upper revolving structure 2b side door 2c work deck 4 engine 4a fan 4b Supercharger 4c muffler 6 counter weight 7 Operator room 10 radiator 11 oil cooler 12 motors 12a fan 13, 14 flow path 16 engine units 17 Aftercooler 17a, 17b, 18a pipes 18 air cleaner 20,21,22 bulkhead 21a Lower part of partition wall 21b Upper part of partition wall 25 steps 26A, 26B, 27A, 27B bracket

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akitoshi Nishikawa             4-10-1, Yoga, Setagaya-ku, Tokyo             Within Mitsubishi Corporation (72) Inventor Naotaka Michiya             4-10-1, Yoga, Setagaya-ku, Tokyo             Within Mitsubishi Corporation (72) Inventor Masaaki Takeuchi             7-14 Wadamiyadori, Hyogo-ku, Kobe-shi, Hyogo             Issue Nishiryo Engineering Co., Ltd. (72) Inventor Toshiharu Iisasa             7-14 Wadamiyadori, Hyogo-ku, Kobe-shi, Hyogo             Issue Nishiryo Engineering Co., Ltd. (72) Inventor Shigemi Takeuchi             7-14 Wadamiyadori, Hyogo-ku, Kobe-shi, Hyogo             Issue Nishiryo Engineering Co., Ltd. F-term (reference) 2D015 CA02

Claims (4)

[Claims] 1. An engine unit in which a cooler of at least one of a radiator and an oil cooler, a fan, and an engine are arranged in series, a device connected to the engine via a pipe, and a pair sandwiching the engine unit. And a partition wall of the cooling air generated by the fan is formed by the pair of partition walls,
In the engine room structure of the construction machine, in which the upper end of at least one partition is connected to the deck on the upper surface of the fuselage, the one partition is arranged such that the lower part is arranged closer to the engine unit while the upper part is arranged more than the lower part. The pipe is formed so as to be separated from the engine unit, and the pipe is installed in a space formed between the upper portion of the one partition and the engine unit, and the pipe is provided at a part of an upper end portion of the one partition. An engine room structure for a construction machine, wherein a step extending from a deck toward the engine unit is provided. 2. The engine room structure for a construction machine according to claim 1, wherein the device is an aftercooler. 3. The engine room structure for a construction machine according to claim 1, wherein the equipment is an air cleaner. 4. The step is supported by a wall surface of the one partition wall via a bracket,
An engine room structure for a construction machine according to any one of claims 1 to 3.