JP2002192960A - Engine hood for construction machinery - Google Patents

Abstract

(57) [Problem] To provide an engine hood of a construction machine capable of improving a working environment. A construction machine in which an engine (8) is mounted in a machine room (7), and cooling air to a radiator (9) for cooling the engine (8) is sucked from an intake port (14) and discharged from an exhaust port (15) provided in an engine hood (6). In the engine hood, the engine hood 6 has a plurality of holes on a surface 6C formed in a strip shape in the width direction of the vehicle body, a part of the plurality of holes is used as an intake port 14, and at least one of the remaining plurality of holes is provided. The portion is configured as an exhaust port 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an engine hood for a construction machine.

[0002]

2. Description of the Related Art FIG. 13 is a schematic view of the interior of an engine room 30 of a conventional hydraulic shovel viewed from the rear. FIG.
As shown in FIG.
A radiator 31, a fan 32, an engine 33, and a hydraulic pump 34 are provided in this order. On the upper surface of the engine room cover 35 that covers the engine room 30, an intake port 36 that communicates the space in front of the radiator 31 (left side in FIG. 13) with the outside air, the space behind the radiator 31 (right side in FIG. 13) and the outside air. And an exhaust port 37 for communicating the same. The cooling air that has flowed into the engine room 30 from the intake port 36 due to the rotation of the fan 32 exchanges heat with the radiator 31 and then passes through the fan 32, where the cooling air of the engine 33 and the hydraulic pump 34 in the space behind the radiator 31 is removed. The heat is absorbed and discharged from the exhaust port 37 to the outside of the engine room. Further, the engine 33 includes a muffler 3 as a silencer.
8 and exhaust gas from the engine 33 through the tail pipe 39 connected to the muffler 38.
Is discharged to the outside.

[0003] The radiator 31 is secured by securing the air volume of cooling air.
In order to obtain a high cooling efficiency in the case of adopting countermeasures such as increasing the outer diameter size of the fan 32 or increasing the rotation speed of the fan 32, noise from the fan 32 (in this case, wind noise) Becomes larger. In addition, in order to ensure cooling performance (heat balance of the engine 33), the radiator 31 having a large size capable of coping with a small cooling air flow.
Alternatively, it is conceivable to employ a radiator 31 having a finer fin pitch, but this leads to an increase in size and cost of the apparatus. For this reason, conventionally, in order to secure the cooling performance, the opening areas of the intake port 36 and the exhaust port 37 are secured, so that the ventilation resistance is reduced to secure the air volume of the cooling air, and the fan 32 and the engine 33 In addition, noise generated from the hydraulic pump 34 and the like is reduced by a sound absorbing mechanism such as a sound absorbing material 40 adhered in the engine room 30.

[0004]

However, the prior art has the following problems. That is,
In recent years, there has been an increasing demand for lowering the noise of construction machines. However, since the intake port 36 and the exhaust port 37 are directly facing the noise source such as the engine 33, the noise from the noise source through the intake port 36 and the exhaust port 37 is increased. The noise leaks directly to the outside, and even if a sound absorbing mechanism such as the sound absorbing material 40 is used, the noise cannot be sufficiently reduced, and the working environment cannot be improved. Further, depending on the model, the exhaust port 37 is provided on the side surface or the bottom surface of the engine room 30, but if it is on the side surface, the surrounding workers are exposed to hot cooling air to give discomfort. , Which worsens the working environment.

The present invention has been made in view of the above problems, and has as its object to provide an engine hood of a construction machine capable of improving a working environment.

[0006]

In order to achieve the above object, an engine is mounted in a machine room, and cooling air to a radiator for cooling the engine is sucked in from an intake port. In the engine hood of a construction machine that discharges from an exhaust port provided in the engine hood, the engine hood has a plurality of holes on a surface formed in a band shape in a vehicle width direction, and a part of the plurality of holes serves as an intake port, At least a part of the remaining holes is used as an exhaust port. The belt-shaped surface is a step surface of a step provided on the engine hood. A guide path for guiding exhaust gas discharged from a muffler mounted on the engine to a part of the plurality of holes is provided. The band-shaped surface is provided continuously in the vehicle width direction. The band-shaped surface is provided intermittently in the vehicle width direction. The engine hood includes a first hood surface that covers the engine from the rear end of the vehicle body to the front side of the engine and has an edge that is separated from the vehicle body front side wall surface by a predetermined distance, and a vehicle body front of the machine room. A second hood surface that covers at least a portion above the edge from the side wall surface, and a plurality of the second hood surface are provided between the first hood surface and the second hood surface along the tip of the second hood surface; And a third hood surface having holes.

[0007] That is, since the heated cooling air is dispersed and exhausted from the plurality of exhaust ports provided on the belt-like surface, the working environment can be improved without giving any discomfort to the surrounding workers. . Since the intake and exhaust ports are provided using the step surface that accentuates the exterior design, the engine hood structure has an excellent exterior design. A plurality of exhaust gas exhaust ports are provided on the belt-shaped surface of the engine hood, and a duct for guiding exhaust gas from the muffler to the plurality of exhaust gas exhaust ports is provided. This allows
Since the tail pipe of the muffler projecting from the engine hood can be eliminated, the rear view can be improved, and the exhaust gas is dispersed and exhausted from the plurality of holes, so that it does not cause discomfort to surrounding workers. Since the belt-like surface provided with the intake port and the exhaust port is a continuous surface, the structure is simplified and the cost is reduced. Since the strip-shaped surface provided with the intake port and the exhaust port is an intermittent surface, mixing of the intake air and the exhaust air can be prevented, and a more efficient cooling effect can be obtained. An intake port and an exhaust port are provided on a third hood surface, which is a step between the first hood surface and the second hood surface of the engine hood, and the first hood surface covers the engine. The ports and exhaust ports have a structure that does not directly face the engine. Thus, since noise does not leak directly from the noise source to the outside, noise can be reduced. When the engine hood is provided with a band-shaped surface along the shape covering both sides from the upper surface, a large opening area of the intake port and the exhaust port can be secured, so that the ventilation resistance is reduced. The cooling efficiency can be improved by increasing the amount of cooling air.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of a hydraulic excavator as an example of a construction machine to which the present invention is applied, FIG. 2 is a plan view showing an arrangement of devices in a machine room, and FIG. FIG. 3 is a sectional view taken along line A. The hydraulic excavator 1 includes a lower traveling structure 2, an upper revolving structure 3 that is rotatably mounted on the lower traveling structure 2, and a base end provided at a front portion of the upper revolving structure 3 with respect to the upper revolving structure 3. And a working machine 4 that is mounted to be able to move up and down. A driver's cab 5 is mounted on the front left side of the upper swing body 3, and a rear part of the upper swing body 3 is a machine room 7 covered with an engine hood 6.

An engine 8 is mounted substantially horizontally in a substantially central portion of the machine room 7, and a radiator 9 is mounted in front of the engine 8 (downward in FIG. 2). A fan 10 driven by the engine 8 is arranged between the engine 8 and the radiator 9. An air cleaner 11 is provided in front of the radiator 9 (on the side opposite to the engine 8), and supplies air to the engine 8 via an intake pipe 11a. A hydraulic pump 12 driven by the engine 8 is mounted behind the engine 8, and various hydraulic actuators (hydraulic cylinders, not shown) mounted on the hydraulic shovel 1 are mounted on the hydraulic excavator 1.
Hydraulic oil). Engine 8
A muffler 13 is mounted above.

As shown in FIG. 3, the machine room 7 is a space surrounded by a base 3A of the upper swing body 3, a wall surface 7A on the front side of the vehicle body, and an engine hood 6. The engine hood 6 has an edge 6Aa that covers the upper side and the side of the engine 8 from the rear end of the base 3A of the upper swing body 3 to the front side of the vehicle body of the engine 8, and has an edge 6Aa separated from the wall surface 7A by a predetermined distance. First hood surface 6A shaped like a half-down bowl
Along the second arch-shaped second hood surface 6B, which covers from the wall surface 7A to above the edge 6Aa of the hood surface 6A (the separated portion between the edge 6Aa and the wall surface 7A), and along the tip of the hood surface 6B. It is roughly constituted by a third hood surface 6C provided between the hood surface 6A and the hood surface 6B. That is, the hood surface 6C is a band-shaped step surface provided at the step between the hood surface 6A and the hood surface 6B. The hood surface 6C is provided with a plurality of air ports 14, 15, 16 (an intake port 14, an exhaust port 15, and an exhaust gas exhaust port 16 as described later) almost entirely. Here, as shown in FIG. 4, the engine hood 6 has a hood surface 6A as shown in FIG.
The hood surface 6B and the hood surface 6C may be formed of the same member, or the hood surface 6B and the hood surface 6C may be formed of the same member and the hood surface 6A may be formed of a separate member, as shown in FIG. Alternatively, as shown in FIG. 4C, the hood surface 6A, the hood surface 6B, and the hood surface 6C may be formed of different members.

As shown in FIG. 5, a duct 17 is formed below the hood surface 6B near the muffler 13.
The duct 17 is a duct member 1 having a bottom surface and left and right side surfaces.
7A, the wall surface 7A, the hood surface 6B, and the hood surface 6C form a substantially rectangular parallelepiped shape. A plurality of air ports 16 are provided on the hood surface 6C, and are used as exhaust gas exhaust ports 16 for discharging exhaust gas of the engine 8.
A hole 17 is formed in the bottom surface of the duct member 17A so that an exhaust pipe 13a extending from the muffler 13 is inserted into the duct 17.
Aa is provided.

The inside of the machine room 7 is divided into a radiator room 7a and an engine room 7b by a partition wall 18 extending from the end face of the radiator 9 on the engine 8 side in the front-rear direction of the upper swing body 3. The plurality of air ports 14 on the radiator chamber 7a side are used as intake ports 14 for sucking cooling air sucked into the radiator 9 and air sucked into the air cleaner 11 from outside into the radiator chamber 7a. Further, of the plurality of air ports 15 and 16 on the engine room 7b side,
The air ports 15 other than the above-described exhaust gas exhaust ports 16 are used as the exhaust ports 15 for discharging the cooling air that has passed through the radiator 9.

The fan 10 is driven by the driving force from the engine 8.
When is rotated, cooling air is drawn into the radiator chamber 7a from the intake port 14, and further flows through the radiator 9 into the engine chamber 7b. The radiator 9 exchanges heat with the cooling air when passing through, and cools the engine cooling water.
The cooling air flowing into the engine chamber 7b absorbs heat generated by devices such as the engine 8 and the hydraulic pump 12, and is discharged from the exhaust port 15 to the outside air. Radiator room 7a and engine room 7
The partition 18 that separates the cooling air b prevents the cooling air that has passed through the radiator 9 from flowing back to the radiator chamber 7a.
The air sucked from the air cleaner 11 is discharged from the engine 8 to the muffler 13 as exhaust gas, flows into the duct 17 through the exhaust pipe 13a of the muffler 13, and is discharged from the exhaust gas exhaust port 16 to the outside air.

According to this embodiment, since the intake port 14 and the exhaust port 15 do not directly face the noise source such as the engine 8, the fan 10, and the hydraulic pump 12, the noise source of the noise source Since the emitted noise does not leak directly to the outside, the noise can be reduced. Further, the exhaust port 15 is provided on the belt-shaped stepped surface extending long in the width direction of the vehicle body from the top to the side, so that a large exhaust area can be secured. Since the exhaust is dispersed and exhausted from the plurality of exhaust ports 15, the exhaust is soft. Since the air is exhausted rearward along the hood surface 6A, even if the surrounding worker is near the vehicle body in the exhaust direction (rearward direction of the vehicle body), since the distance from the exhaust port 15 to the worker is long, the surrounding work is performed. It does not cause discomfort to the person.

Further, since the exhaust gas from the engine 8 is dispersed and exhausted from the exhaust gas exhaust port 16, the exhaust gas is softly exhausted similarly to the above-described exhaust port 15, and the exhaust gas from the exhaust gas exhaust port 16 is located near the vehicle body. Since the distance to the worker is long, the high temperature exhaust gas does not cause discomfort to surrounding workers. Further, in the case of a model in which the exhaust port is provided on the bottom surface of the vehicle body, dust and the like on the ground may be rolled up by the exhaust, but in the present embodiment, the dust and the like on the ground are exhausted along the hood surface 6A. No rolling occurs. In the present embodiment, the tail pipe of the muffler 13 projecting from the engine hood 6 is eliminated by using the duct 17. If the tailpipe protrudes from the engine hood 6, not only the rear of the tailpipe is not visible, but also the surrounding area becomes difficult to see, and the rear visibility deteriorates. However, by eliminating the tailpipe, the rear visibility is improved.

The present invention is not limited to the above embodiment. For example, in the embodiment, the radiator 9 is arranged in the same direction as the engine 8, but as shown in FIG. 6, the radiator 9 may be arranged so as to turn 90 degrees and face in the front-rear direction of the vehicle body. However, it may be at an intermediate position. However, in this case, it is necessary to provide a duct 20 for connecting the radiator 9 to the partition 18. Also, by adopting an electric fan instead of the fan 10 driven by the engine 8, the duct 2
It is also possible to arrange the fan at any position within zero.

Further, in the embodiment, the band-shaped stepped surface provided with the air port is provided from the upper surface of the engine hood 6 to both side surfaces. However, as shown in FIG. Instead, the hood surface 21 </ b> C and the hood surface 21 </ b> B provided with the plurality of air ports 23 (a part is an intake port and a part is an exhaust port) may be provided only on the upper surface of the engine hood 21. The shape of the engine hood is not limited to a half bowl shape, and the present invention may be applied to a substantially rectangular parallelepiped engine hood 22, for example, as shown in FIG. In this case, the hood surface 22 </ b> C provided with the plurality of air ports 23 is a substantially rectangular band-shaped surface of the step surface of the engine hood 22 facing the rear of the vehicle body. Further, as shown in FIG. 9, a plurality of air ports 23 may be provided by using a step surface formed by lateral hood surfaces 27E and 27D of the engine hood 27 having a substantially rectangular parallelepiped shape. Further, the hood surface having a plurality of air ports may be a curved surface instead of a flat surface. For example, as shown in FIG. 10, the second hood surface 25 </ b> B protrudes rearward at the center of the vehicle body and covers up to the center of the first hood surface 25 </ b> A having the same shape as the hood surface 6 </ b> A in FIG. 1. There is a third hood surface 25C having a plurality of air ports,
The curved surface has a substantially waveform when viewed from above. In this case as well, the hood surface 25A covers up to above the noise source such as the engine 8 and the plurality of air ports 23 provided on the hood surface 25C do not directly face the noise source. Noise from the noise source does not leak directly to the outside. Further, as shown in FIG. 11, the band-shaped surface provided with the plurality of air ports 23 may be a plurality of hood surfaces 29C, 29C. The hood surface 29C is the first hood surface 29A.
And / or a step surface orthogonal to the second hood surface 29B is not necessary, and as shown in FIG.
And / or a step surface inclined with respect to a plane orthogonal to the second hood surface 29B.

In the embodiments described so far, the first hood surface covers the entire upper portion of the engine 8. However, the intake port and the exhaust port provided on the third hood surface are provided with the engine 8 and the fan 10. As long as the first hood surface covers only a part of the engine 8 as shown in FIG. That is, a first hood surface 6a that covers about half of the rear side of the engine 8 from the rear end of the vehicle body, and a second hood that covers the vehicle body front side wall surface 7A of the machine room 7 from above the first hood surface 6a. The surface and the surface overlap by a predetermined distance, and the overlapping portion forms a duct. The third hood surface 6c between the tip of the second hood surface 6b and the first hood surface 6a has a structure that does not directly face the noise source by the first hood surface 6a of the overlapping portion. Has become. For this reason,
The noise from the noise source does not leak directly to the outside from the intake port and the exhaust port provided on the third hood surface 6c, and a noise reduction effect can be obtained by the duct structure. 1, 9 and 1, rather than providing a step only on the upper surface as in FIGS. 7 and 8.
If a step is provided from the upper surface to the side surface of the engine hood as in 0, it is easier to secure the total opening area of the air port. The shape of the air ports provided on the band-shaped step surface is not limited to a circular shape, and is arbitrary. Further, the air ports need not be arranged in a single line along the step, and may have a line structure such as two lines or three lines. A metal having a large number of relatively small holes in a staggered arrangement, such as metal, may be used. Of course, in order to further reduce the noise in the machine room, a sound absorbing material such as urethane foam may be attached to the inside of the machine room. Although the description has been given of the suction type engine hood, the present invention may be applied to a discharge type engine hood.

As described above, according to the present invention, since a plurality of exhaust ports are provided on the belt-shaped surface of the engine hood, heated cooling air can be dispersed and exhausted. Thus, the working environment can be improved without giving any discomfort to the surrounding workers. Further, since a plurality of exhaust gas outlets are provided on the belt-like surface to exhaust the exhaust gas, the exhaust gas can be dispersed and exhausted. Thus, the working environment can be improved without giving any discomfort to the surrounding workers. Further, the tail pipe of the muffler projecting from the engine hood can be eliminated, and the rear view can be improved.
Also, the step surface of the engine hood provided with the intake port and the exhaust port has a structure that does not directly face the noise source such as the engine, and the noise from the noise source does not leak directly from the intake port and the exhaust port to the outside. Noise can be reduced and the working environment can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a hydraulic shovel according to the present invention.

FIG. 2 is a plan view showing an arrangement of devices in a machine room according to the embodiment.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a cross-sectional view of the engine hood according to the embodiment.

FIG. 5 is a perspective view showing an exhaust gas exhaust duct according to the embodiment.

FIG. 6 is a plan view showing an arrangement of devices in a machine room according to another mode of the embodiment.

FIG. 7 is a front view of an engine hood according to another aspect of the embodiment as viewed from the rear.

FIG. 8 is a perspective view showing an engine hood according to another aspect of the embodiment.

FIG. 9 is a perspective view showing an engine hood according to another mode of the embodiment.

FIG. 10 is a perspective view showing an engine hood according to another aspect of the embodiment.

FIG. 11 is a sectional view of an engine hood according to another mode of the embodiment.

FIG. 12 is a sectional view of an engine hood according to another mode of the embodiment.

FIG. 13 is a plan sectional view of an engine room of a conventional hydraulic excavator.

[Explanation of symbols]

1. Hydraulic excavator, 2. Lower traveling body, 3. Upper revolving body,
6, 21, 22, 25, 27, 29 ... engine hood,
6A, 6B, 6C hood surface, 7 machine room, 8 engine, 9 radiator, 10 fan, 11 air cleaner, 12 hydraulic pump, 13 muffler, 14 intake port,
15 ... exhaust port, 16 ... exhaust gas exhaust port, 17 ... duct,
18 ... partition wall, 23 ... air port.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) E02F 9/00 B62D 25/10 GLF term (reference) 2D015 CA02 CA03 3D004 AA07 AA08 AA15 BA04 CA01 DA02 DA06 3D038 AA05 AA10 AB09 AC10 AC11 AC12 AC24 BA19 BB09 BC10

Claims (6)

[Claims] An engine hood for a construction machine in which an engine is mounted in a machine room and cooling air to a radiator for cooling the engine is taken in from an intake port and discharged from an exhaust port provided in the engine hood. The hood has a plurality of holes on a surface formed in a band shape in the vehicle width direction, a part of the plurality of holes serves as an intake port, and at least a part of the remaining plurality of holes serves as an exhaust port. And construction machinery engine hood. 2. The engine hood of a construction machine according to claim 1, wherein the belt-like surface is a step surface of a step provided on the engine hood. 3. The engine hood of a construction machine according to claim 1, further comprising a guide path for guiding exhaust gas discharged from a muffler mounted on the engine to a part of the plurality of holes. Engine hood for construction machinery. 4. The engine hood of a construction machine according to claim 1, wherein the belt-like surface is provided continuously in a vehicle width direction. 5. The engine hood of a construction machine according to claim 1, wherein the band-shaped surface is provided intermittently in a vehicle width direction. 6. The engine hood of a construction machine according to claim 1, wherein the engine hood covers an engine from a rear end portion of the vehicle body to a front side of the engine body, and the engine hood is located in a front of the vehicle body in a machine room. A first hood surface having an edge separated from the side wall surface by a predetermined distance;
A second hood surface that covers at least above the edge from the vehicle body front side wall surface of the machine room, and between the first hood surface and the second hood surface along a tip of the second hood surface. And a third hood surface provided with a plurality of holes.