JPH0241054Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a noise prevention device applied to construction machines such as shovels and cranes.

[Conventional technology]

In recent years, construction machinery such as excavators are desired to be of a low-noise type in order to reduce the noise around the work site. The noise generated from the construction machine itself is mainly the engine sound from the engine, and in order to reduce the noise, an important issue is how to suppress this engine sound from leaking to the outside. For this reason, it is conceivable to configure the engine room in a sealed manner to prevent engine noise from leaking to the outside, but if the engine room is made in a sealed manner, cooling air for cooling the engine will be taken into this engine room. There is a problem where the engine is unable to do so and the engine overheats.

For this reason, the engine room cannot be constructed in a completely sealed manner, and must at least have an intake port to take in cooling air from the outside and an exhaust port to release the air after cooling the engine. .

However, when these air intake and exhaust ports are formed on the side wall of the engine room, engine noise is emitted from these openings to the sides of the construction machine (laterally), causing workers on the side to face the building. As the sound travels, it becomes a noise to the surroundings. Therefore, it is desirable to avoid emitting engine noise to the sides.

For this reason, it is conceivable that at least the air intake port and the air exhaust port that are opened into the engine room are opened in the ceiling wall of the engine room. When the exhaust port is formed in the ceiling wall, the engine sound is emitted upward, reducing the noise to workers and buildings on the sides of the engine room.

[The problem that the idea aims to solve]

However, when opening an outlet in the ceiling wall of the engine room, if the outlet is opened directly upward, there is a problem that rainwater, dirt, dust, mud, etc. generated during work may enter the engine room through this opening. In order to prevent this, it is conceivable to cover the upper part of the outlet with a baffle plate, and use this baffle plate to direct the opening direction of the outlet opened in the ceiling wall to the side.

However, with such an exhaust port, even though it is opened in the ceiling wall, the opening direction is toward the side, so engine noise is emitted from the side, similar to when the exhaust port is opened in the side wall of the engine room. There is a problem in that the noise is emitted towards the surrounding area and increases the noise level towards the surrounding area.

In this invention, although the exhaust port is formed in the ceiling wall of the engine room, the construction is such that it prevents the intrusion of rainwater, dust, garbage, etc., and also reduces noise to the side surroundings. The purpose is to provide a noise prevention device for machinery.

[Means to solve the problem]

In the present invention, the upper part of the exhaust outlet formed in the ceiling wall of the engine room is covered with a baffle plate and opened to the side, and the exhaust outlet has first openings that cross or face each other. and a second exhaust port, and the air discharged from these exhaust ports collides with each other.

[Effect]

According to the present invention, the engine sound emitted from the first exhaust port and the second exhaust port is affected by the turbulence of the cooling air that collides with each other outside these exhaust ports, and the cooling air is straight. Compared to the case where the engine sound travels sideways, the rate at which the engine sound travels to the side is reduced. Therefore, it is possible to reduce the noise sensation around the sides of the engine room.

〔Example〕

An embodiment of this invention will be described below based on the drawings.

In the figure, 1 is the body of the shovel. A pair of frames 2, 2 are provided on the left and right sides of this vehicle body 1, and crawlers 3, 3 are wound around these frames 2, 2, respectively. A rotatable swivel base 4 is provided on the vehicle body 1, and a boom 5 is pivotally supported on the swivel base 4 so as to be movable. An arm 7 is rotatably attached to the tip of the boom 5 via a pin 6, and a bucket 10 is rotatably supported at the tip of the arm 7 via pins 8 and 9.
The boom 5, arm 7 and bucket 10 are each a boom cylinder 1 consisting of a hydraulic cylinder.
1. Operated by arm cylinder 12 and bucket cylinder 13. Note that 14 is the driver's seat.

The swivel base 4 is provided with an engine room 15. This engine room 15 is composed of a box-shaped engine cover 16, and an engine 17 is housed inside the engine cover 16. Note that 18 is a radiator, and 19 is a cooling fan. Also,
Hydraulic pumps 20, 20 are driven by the engine 17 and pump oil to the respective hydraulic cylinders.

A cooling air intake port 21 is formed in one side wall 16a of the engine cover 16 facing the radiator 18. This intake port 21 is provided with intake wind control plates 22...
A portion of the cooling air taken in from the intake port 21 is controlled in a direction in which it is blown against the ceiling wall 16b of the engine cover 16.

In the ceiling wall 16b of the engine room 15, there is a first exhaust port 2 at a position close to the intake port 21 side.
3 is formed, and this first discharge port 23 is provided with a first discharge wind control plate 24 . These first discharge wind control plates 24 have a shape bent toward the other side wall 16c opposite to the one side wall 16a in which the intake port 21 is formed, and
3 is opened substantially laterally, thereby making it possible to control the cooling air so that the cooling air taken in from the intake port 21 flows toward the other side wall 16c while flowing along the ceiling wall 16b. It's summery.
Further, a second exhaust port 25 is formed in the ceiling wall 16b of the engine room 15 near the other side wall 16c, and this second exhaust port 25 is provided with a second discharge baffle plate 26... It is being These second discharge air baffles 26 are inclined toward the one side wall 16a side, and convert the cooling air discharged from the second discharge port 25 into the cooling air discharged from the first discharge port 23. It is designed to control the wind in the direction of collision with the current. Note that 27 is an inclined guide portion of the ceiling wall 16b that makes it easier for the cooling air discharged from the second discharge port 25 to collide with the flow of cooling air discharged from the first discharge port 23.

Further, 28 is a counterweight.

According to one embodiment with such a configuration, the cooling air taken in from the intake port 21 passes through the engine room 15 and is discharged from the first exhaust port 23 and the second exhaust port 25, respectively.

Therefore, the heat dissipation efficiency of the radiator 18 is increased by the cooling air, and the engine 17 is cooled by the cooling air, so that overheating of the engine 17 can be prevented.

In this case, although the first discharge port 23 and the second discharge port 25 are each opened in the ceiling wall 16b of the engine room 15, the upper part thereof is formed integrally with the ceiling wall 16b. First discharge wind control plate 24... and second discharge wind control plate 2
6..., the intrusion of rainwater, dirt, dust, etc. into the engine room 15 through these exhaust ports 23, 25 is reduced.

By providing the air baffle plates 24... and 26..., the first outlet 23 and the second outlet 25 open laterally, respectively. The cooled air is regulated along the ceiling wall 16b of the engine cover 16 in the direction of the other side wall 16c, and the cooling air discharged from the second exhaust port 25 is cooled from the first exhaust port 23. Since the cooling air is controlled in a direction that collides with the air flow, these cooling air collide with each other above the engine room 15.

When the cooling air collides with each other in this way, a turbulent flow is generated, and the air itself spreads laterally less than when it does not collide.

In response to such air flow, engine noise generated within the engine room 15 is emitted from the first exhaust port 23 and the second exhaust port 25 along with the flow of the cooling air. Since sound is generally affected by the flow of the medium, the engine sound that has flowed out on the cooling air flow is prevented from spreading laterally due to the turbulence generated by the collision of the air. In other words, when the airflows do not collide, the engine sound also travels straight to the side, but when the air as a medium collides and causes turbulence, the proportion of the engine sound that travels to the side decreases.

As a result, even though the exhaust ports 23 and 25 are opened laterally, the propagation of engine noise to the sides of the engine room 15, that is, to the lateral direction, is reduced. Therefore, it is possible to reduce the noise perceived by the workers working on the side of the construction machine and the buildings around the side, and the engine sound is reflected by the structures around the side, causing reflected sound. Since no noise is generated, the feeling of noise can be reduced.

In addition, the intake wind control plate 22 provided at the intake port 21
... directs a part of the cooling air taken in from this intake port 21 toward the ceiling wall 16b, and avoids the intake port 21 from opening directly to the side, so that the engine noise from the engine 17 is transmitted to this intake port 21.
This prevents leakage to the side through the filter, thereby preventing noise.

Note that this invention is not limited to the above embodiment. For example, although this embodiment has been described as being applied to the engine room of a shovel, it can also be applied to the engine room of a construction machine such as a truck crane. Further, the air intake plates 22 of the intake port 21 are not necessarily provided to be inclined upward, but may be provided to be inclined downward.

[Effect of idea]

As explained above, according to this invention, since the cooling air taken in from the intake port passes through the engine room and is discharged from the first and second exhaust ports, the engine can be cooled well. Although the first and second outlets are formed in the ceiling wall of the engine room, the upper part of these outlets is covered with a baffle plate, which reduces the chance of rainwater, dirt, dust, etc. entering the engine room. .
Moreover, even if the engine sound is to be propagated laterally from the opening facing the side by covering the exhaust port with a baffle plate, the first and second exhaust ports will face each other and the respective Since the cooling air exiting the exhaust port is impinged, sound propagation is limited by air turbulence, thus reducing lateral propagation of engine sound. As a result, the feeling of noise to the sides is reduced.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, in which Fig. 1 is a side view of the shovel, Fig. 2 is a sectional view taken along the line of Fig. 1, Fig. 3 is a plan view of the engine room, and Fig.
The figure is a sectional view of the main part. 15...Engine room, 21...Intake port, 2
2...Intake wind control plate, 23...First discharge port, 2
4...First discharge wind control plate, 25...Second discharge port, 26...Second discharge wind control plate.

Claims (1)

[Scope of utility model registration request] An intake port for taking in engine cooling air is provided in an engine room that accommodates an engine of a construction machine, and an intake port is formed in the ceiling wall of the engine room and is opened to the side by being covered with a baffle plate from above. a first exhaust port for discharging cooling air in the engine room; and a flow of cooling air that is formed in the ceiling wall of the engine room and covered above with a baffle plate to be discharged from the first exhaust port. 1. A noise prevention device for construction machinery, comprising: a second exhaust port that opens toward the side in the direction of collision and discharges cooling air in the engine room.