JP3256934B2 - Breathable firewall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an engine wall provided in a hydraulic construction machine for preventing pressurized oil from splashing to an engine.

[0002]

2. Description of the Related Art A drive source such as an engine, a radiator, an air-cooling fan, a hydraulic pump, and the like are appropriately disposed inside a device body of a hydraulic construction machine represented by a hydraulic shovel. For example, FIG. 4 shows a device arrangement on the rear side of a vehicle body of a hydraulic shovel. And while such equipment is arranged, in order to prevent the hydraulic oil from splashing into the high temperature part of the engine due to accidental rupture of the hydraulic hose, the engine 2 and the hydraulic pump 5 are A partition 1 is provided. This partition 1 is generally called a firewall.

[0003]

However, since the engine 2 is covered by the firewall 1, the wind drawn into the engine 2 by the fan 3 is blocked by the firewall 1. here,
Since there is a ventilation hole 7 in the engine hood 6 above the engine 2, the flow of wind blocked by the firewall 1 is directed toward the ventilation hole 7, and as a result, the engine sound also escapes from above, and the canopy (illustrated) None), the engine sound was a noise and hindered comfortable operation.

The present invention has been made in view of the above-described problems of the prior art, and reduces the noise by preventing the flow of air from flowing toward the engine hood without disturbing the original function of the firewall. It is intended to provide a firewall.

[0005]

For this reason, the firewall according to the present invention has a through-hole through which the flowing air can flow outside the firewall, at least in a portion receiving the flowing air from the fan in the firewall covering the engine. Wherein the upper and lower sides of the through hole are formed.
At the end, provide an overhang that protrudes outward, and
The extension is bent downward on the way, and the lower end is stretched.
It becomes a shielding plate that the projection can be hidden from the horizontal direction
And said that you are.

According to the present invention, at least a portion of the firewall covering the engine that receives the flow of air from the fan is formed with a through-hole through which the flow of air can flow outside the wall. It flows from the through hole to the outside of the wall, that is, to the pump side. For this reason, the engine sound also flows to the pump side along with the flowing wind, so that the engine sound reaching the canopy is significantly reduced.

On the other hand, the upper and lower ends of the through hole project outward.
The overhang at the upper end
Is bent toward the bottom so that the overhang of the lower end is horizontal
Since a shielding plate as hidden look al, if the pressure oil by accidental hydraulic hose rupture splashed in firewall side, the pressure oil is first strikes the shield plate formed by the overhang of the upper end Will be. If the pressure oil is from below
Collides with the overhang of the lower end even when bouncing upward
I do. Therefore, it is necessary to prevent the jumping pressure oil from flowing into the through hole.
It can be completely prevented, and at least the pressurized oil is not directly applied to the engine.

[0008] Further, hydraulic components, piping, and the like are arranged on the pump side, and by flowing air therethrough, they can be cooled. As a result, the heat balance is greatly improved. In addition, since the circulation air circulates in the space on the pump side, engine noise accompanying the circulation is attenuated, and the effect of reducing noise to the outside can be improved. Further, if a sound absorbing member is attached to the pump-side device, the noise reduction effect is further improved.

[0009]

Embodiments of the present invention will be described with reference to the drawings. This embodiment shows an example of application to a hydraulic excavator. FIG. 1 is a plan view showing an arrangement of devices of a hydraulic excavator device main body, and FIGS. 2 and 3 are explanatory diagrams showing a structure of a firewall.

In the hydraulic excavator of this embodiment, as shown in the figure, an engine 2, a fan 3, and a radiator 4 are arranged in series at the rear side of the main body along the vehicle body width direction. 5 is arranged. A firewall 1 is arranged between the engine 2 and the hydraulic pump 5 so as to cover the periphery of the engine 2. In this arrangement,
The distribution wind drawn by fan 3 is radiator 4,
Firewall 1 on the right side of the engine, passing through Engine 2
will head to a.

The firewall 1a is made of a plywood in which a metal inner plate 10 and a plastic outer plate 11 are combined, and a plurality of through holes 12 are formed. This is done by first making a cut in the inner plate 10 that can be bent downward,
13 is bent so as to protrude outward to form a gap serving as the through hole 12. On the other hand, the outer plate 11 is provided with a notch which can be bent upward in two steps at a position facing the gap, and a distance l ₁ from the first bending line to the second bending line and a second both the fold lines a distance l ₂ to pieces tip cuts longer than the gap width w, the cut pieces 14 from the first fold line folding so as to project outward, downward from the second fold lines The sheet is bent, and a shielding plate 15 is formed at the tip of the cut piece 14. If the two are combined so as to cover the gap of the inner plate 10 with the shielding plate 15 of the outer plate 11, the through-holes 12 on the outer surface of the firewall 1a are formed by the shielding plate 15 so as to face downward, and from the horizontal direction. The 12 holes are invisible. Therefore, the wind heading for the firewall 1a enters the through hole 12 and flows downward to the hydraulic pump 5 side by the shielding plate 15 (FIG. 3).
Even if pressure oil splashes from the hydraulic pump 5 side, it cannot penetrate into the engine 2 side because the through-hole 12 is directed downward by the shielding plate 15 (indicated by a solid line arrow). This is indicated by a dotted chain arrow). In particular, in the present embodiment, since the cut 13 that forms the bottom of the through hole 12 projects outward, even if the pressurized oil splashes upward from below, the cut 2 It is possible to block intrusion into the side.

Further, in this embodiment, a sound absorbing member is appropriately disposed at a location where the above-mentioned circulating air passes among the devices in front of the firewall 1b.

The present embodiment is configured as described above.
As shown by the arrow in FIG. 1, the wind taken in by the fan 3 on the engine 2 side passes through the radiator 4 and the engine 2 to cool it, and then goes to the firewall 1a and from the through hole 12 to the hydraulic pump 5. . Various hydraulic devices are provided on the hydraulic pump 5 side, pass between these devices, and pass forward. Therefore, as a result of the engine sound also circulating along with the circulation wind, the engine sound is dispersed, and the noise of the canopy operator is not as much as the conventional noise. In addition, since the flowing air passes through the hydraulic equipment in front, the cooling air can be cooled and the heat balance is improved. At the same time, the engine sound is attenuated by the space in front, and the engine sound is absorbed by the appropriately arranged sound absorbing member, so that the engine sound that escapes from the front is reduced. Even if the hydraulic hose ruptures and pressurized oil splashes, it is blocked by the shielding plate, so that it does not affect the engine 2.

In this embodiment, the firewall 1a
The formation of the through-hole 12 and the shielding plate 15 is performed by a very simple process of making a predetermined cut in each of the two plates and then joining the two as described above. After the formation, another method such as bonding a shielding plate as another member may be used. Further, it is needless to say that the material of the plate, the shape of the through hole and the shape of the shielding plate are not limited to the present embodiment (for example, the entire firewall may be formed as a louver made of a suitable plate).

[0015]

As described above, according to the firewall according to the present invention, the circulation wind drawn by the fan is circulated in the vehicle body without being directed upward, so that the engine reaches the canopy operator as compared with the related art. The sound is reduced, and interference with operation is reduced. On the other hand, the splash of the pressure oil due to the accidental rupture of the hydraulic hose is blocked by the shielding plate, so that the entry of the pressure oil into the engine side is prevented, so that there is no problem. Further, by circulating the circulation wind in the vehicle body, various devices can be air-cooled,
An extremely remarkable derivative effect such as the ability to attenuate the engine sound is produced.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment to which the present invention is applied, and showing a device arrangement of a hydraulic excavator device main body.

FIG. 2 is a perspective view showing an embodiment of the present invention and showing a structure of a firewall.

FIG. 3 is a sectional view taken along line AA of FIG. 2 (however, both plates 10 and 11 are combined).

FIGS. 4A and 4B are schematic explanatory views showing a general arrangement of firewalls, wherein FIG. 4A is a plan view and FIG.

[Explanation of symbols]

 1 (1a, 1b) Firewall 2 Engine 3 Fan 4 Radiator 5 Hydraulic pump 10 Inner plate 11 Outer plate 12 Through hole 15 Shield plate

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Claims (1)

(57) [Claims] At least a portion of a firewall that covers an engine receives a flow of air from a fan,
A firewall having a through hole through which a flow of wind can flow outside the firewall, wherein the upper and lower ends of the through hole are formed.
At the upper end of the
The drawer is bent downward on the way, and the lower end is stretched.
It is a shield plate so that the drawer can be hidden when viewed from the horizontal direction
Firewall with breathability, characterized in that that.