JPS62160917A - Outside air introducing device for internal combustion engine in industrial vehicle - Google Patents

Abstract

PURPOSE:To prevent intrusion of water, dust or the like into the internal combustion engine by forming an outside air inlet port in the upper portion of a rear piller for introducing outside air into the engine on the side thereof facing outside, forming a stepped portion in the lower portion of the rear piller, and forming a drain hole in the upper surface of the stepped portion. CONSTITUTION:Outside air is introduced through an outside air inlet port 13b formed in the upper portion 13a of a rear pillar 13 and supplied through a duct 18 into an internal combustion engine. If rain water or the like enters through the outside air inlet port 13b, it flows down along the inside wall 13e on the inside of the vehicle, until it reaches the upper surface 15b of a stepped portion 15a, where an end plate is provided to prevent further flowing down of the water, so that it is discharged through a drain hole 15c. This structure permits suction air noise to be reduced and dust and water to be prevented from intrusion into the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an outside air introduction device for introducing outside air into an internal combustion engine via a rear pillar that supports an overhead guard of an industrial vehicle.

Prior Art Conventional industrial vehicles include, for example, the Utility Model 57-9206
As shown in FIGS. 4 and 5 described in Publication No. 2, an overhead guard 2 is supported by a front pillar 3 and a rear pillar 4 and is disposed above a seat 1 on which an operator is seated. An internal combustion engine 6 is mounted inside the vehicle 5, and outside air is introduced into the internal combustion engine 6 via the rear pillar 4 and the like.

That is, the outside air is first drawn into the rear pillar 4 through the outside air intake port 4b formed in the upper part 4a of the rear pillar 4, passes through the inside of this rear pillar 4, and enters the duct connected to the lower part 4c of this rear pillar 4. 7 to the internal combustion engine 6.

By introducing outside air into the internal combustion engine 6 from the outside air intake port 4b formed in the upper part 4a of the rear pillar 4 in this manner, air with less dust and the like can be supplied to the internal combustion engine 6.

Problems to be Solved by the Invention However, in such a conventional outside air introduction device, since the outside air intake port 4b faces inside the vehicle, that is, toward the operator, the intake noise causes discomfort to the operator. This is particularly noticeable in cabin cars because the outside air intake port 4b faces the interior of the vehicle.

Furthermore, rainwater or the like may enter together with air through the outside air intake port 4b, and in this case, this water may be sucked into the internal combustion engine 6, leading to a decrease in the performance of the internal combustion engine 6 or a failure.

In order to solve this problem, the present invention forms an outside air intake in the upper part of the hollow rear pillar that supports the overhead guard, in a part facing the outside of the vehicle, and - A stepped portion is formed in the lower part, a drainage hole is provided in the upper surface of the stepped portion, and a duct for guiding air to the internal combustion engine is provided in the vertical wall portion continuous to the lower side of the upper surface. It is characterized by being used as an outside air introduction device for an internal combustion engine of an industrial vehicle connected to the

F-1- With this method, when the internal combustion engine is operating, outside air is introduced into the hollow rear pillar from the outside air inlet formed in the upper part of this pillar, passes through this rear pillar, and is connected to the lower part. Outside air is supplied to the internal combustion engine through the duct. In this case, the intake noise felt by the operator is reduced compared to the conventional system because the outside air intake port is formed in a portion facing the outside of the vehicle.

In addition, during rainy weather or when washing the car, rainwater may enter the rear pillar from the outside air intake, but this water may
It flows downward along the inner wall of the rear villa and reaches the upper surface of the stepped section. Then, the water is drained out of the vehicle through the drain hole formed in the top surface.

As a result, water does not reach the duct connected to the vertical wall below the upper surface, preventing water from being sucked into the internal combustion engine, and maintaining the performance of the internal combustion engine.

Last 11 jobs The present invention will be explained below based on examples.

1 to 3 are diagrams showing one embodiment of the present invention.

First, to explain the configuration, the cylinder number 11 in Fig. 2 is an overhead guard that covers above the operator.
It is supported by 13.

As mainly shown in FIG. 1, these pair of pillar pillars 13 are arranged in an angular shape when viewed from the rear of the vehicle, with the upper portions 13a somewhat inclined toward the inside of the vehicle. This rear biller 13 is formed into a rectangular cylinder shape and is hollow, and has an upper part 13a.
An outside air intake port 13b is provided on the side surface facing the outside of the vehicle, and a louver 14 is screwed to this intake port 13b. Further, a bulging portion 13d that bulges toward the inside of the vehicle is integrally formed on the lower portion 13c of the rear biller 13 by pressing, and has a larger cross-sectional area than the upper portion 13a.

A bracket 15 is joined downward from this bulging portion 13d to close the interior of the pillar. The upper end of the bracket 15 is bent to form a stepped portion 15a, and a drain hole 15c is formed in the upper surface portion 15b of the stepped portion 15a. In addition, this upper surface part 1
A pipe 16 is connected with bolts 17 to a vertical wall portion 15d continuous to the lower side of the pipe 5b, and a duct 18 connected to an air cleaner 19 of an internal combustion engine (not shown) is connected to the pipe 16. Furthermore, the vertical wall portion 1 of this stepped portion 15a
As mainly shown in FIGS. 1 and 3, a long weir plate 15e is joined to the upper part of the weir plate 5d to prevent water from flowing down from the upper surface part 15e to the vertical wall part 15d. There is. Furthermore, the lower end portion of this bracket 15 is also bent in a substantially horizontal direction to form a bottom portion 15f.
A water drain hole of 15g is also provided.

Next, the operation of the outside air introduction device having such a configuration will be explained.

During operation of the internal combustion engine, the upper part 13a of the rear biller 13
from the outside air intake port 13b formed in the rear pillar 13.
Outside air is introduced into the internal combustion engine, passes through the rear biller 13, and is supplied to the internal combustion engine via a duct 18 connected to the lower part 13c. In this case, the intake noise felt by the operator is reduced compared to the conventional case because the outside air intake port 13b is formed on the side surface facing the outside of the vehicle. Moreover, since this outside air intake port 13b is formed in the upper part 13a, air with less dust and the like is guided to the internal combustion engine.

On the other hand, rainwater or the like may enter the rear pillar 13 through the outside air intake port 13b when the internal combustion engine is stopped due to rain or car washing. Among these, the inner wall 1 on the inside of the rear pillar 13
The water flowing downward through 3e reaches the upper surface portion 15b of the stepped portion 15a. Then, the water is discharged out of the vehicle from the drain hole 15c formed in the upper surface portion 15b. In particular, by providing the weir plate 15e, the vertical wall portion 15 of the stepped portion 15a
Water is completely prevented from flowing to the d side, water does not reach the duct 18, water is prevented from being sucked into the internal combustion engine through the duct 18, and the performance of the internal combustion engine is maintained. Furthermore, water flowing along the inner wall 13f of the rear pillar 13 on the vehicle exterior side is discharged to the outside of the vehicle from the water drain hole 15g of the bottom surface portion 15f of the bracket 15, and of course is not sucked into the duct 18.

Here, when the internal combustion engine is operating, an air flow is generated in the rear pillar 13 downward due to the intake negative pressure, but according to experiments, water entering from the outside air intake port 13b is The water becomes droplets and travels along the inner wall of the rear pillar 13 to drain holes 15c and 15 in the same way as above.
g is discharged from the vehicle.

Further, the lower part 13c of the rear pillar 13 has a bulging part 13d.
Since the cross-sectional area is large, the air flow rate is relatively low, so water droplets are not sucked into the duct 18 and are easily discharged from the drain hole 15cel''g.

Furthermore, since the louver 14 and the pipe 16 are screwed together, if they become clogged with dust, they can be removed and cleaned easily.

Incidentally, in recent years, there has been a tendency to make the front pillars 12 thinner due to problems such as improved visibility, so the rear pillars 13 have inevitably become larger due to the need to ensure support strength for the overhead guard 11. As a result of this increase in size, the rear pillar 13 is moved closer to the rear of the operator.
The operator is likely to hit his or her body against this rear pillar 13 or a front pillar (not shown). However, by rounding the operator side corner 13g of the rear pillar 13 or the front pillar (not shown) as shown by the two-dot chain line in Figure 3, it is possible to soften the impact even if the operator accidentally hits the body. can. Of course, even with this degree of roundness, the value of the moment of inertia of the rear pillar 13 does not increase to that extent, and the rigidity of the rear pillar 13 is ensured.

As explained above, according to the present invention, since the outside air intake port is formed in the upper part of the rear pillar facing the outside of the vehicle, the intake noise felt by the operator can be reduced compared to the conventional method. At the same time, a water drain hole was formed on the top of the stepped section, and a duct was connected to the continuous vertical wall below this top surface, allowing water that entered through the outside air inlet to be discharged before it reached the duct. This has the practical effect of preventing water from being sucked into the internal combustion engine and maintaining the performance of the internal combustion engine.

[Brief explanation of drawings]

1 to 3 are diagrams showing an embodiment of the outside air introduction device for an internal combustion engine of an industrial vehicle according to the present invention, in which FIG. 1 is a sectional view taken along line I-I in FIG. FIG. 3 is a perspective view showing a lower part of the industrial vehicle; FIGS. 4 and 5 are views showing conventional examples; FIG. 4 is a side view of the industrial vehicle; The figure is a cross-sectional view of the rear pillar. 11... Overhead guard 13... Rear pillar 13a... Upper part 13b
...Outside air intake port 13c...Lower part 15a...
Stepped part 15b...Top surface part 15c...Drain hole 15d...Vertical wall part 18...Duct Fig. 1 Fig. 2

Claims (1)

[Claims] An outside air intake port is formed in the upper part of the hollow rear pillar that supports the overhead guard, facing the outside of the vehicle, while a stepped part is formed in the lower part of the rear pillar, and the upper part of the stepped part is formed with an outside air intake port. 1. An outside air introduction device for an internal combustion engine of an industrial vehicle, characterized in that a water drain hole is formed and a duct for guiding air to the internal combustion engine is connected to a vertical wall portion continuous to the lower side of the upper surface portion.