JPH11139170A - Ventilation device for industrial vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilation device for an industrial vehicle which can effectively prevent dust from being stirred up and air from blowing toward an operator without any deterioration in cooling performance. SOLUTION: In a ventilation device for an industrial vehicle, a vent passage 6 for discharging cooling air passed through a radiator 3 toward the back side of a vehicle body is arranged in a counterweight 5 mounted in the vehicle body rear part, and an outlet 8 of the vent passage 6 is formed into a laterally long rectangle with an equal cross section area to that of an inlet 7. Between the inlet 7 and the outlet 8, an upper wall face and a lower wall face are formed of slanting faces narrowing toward the outlet 8. On the other hand, both left and right side wall faces are formed of slanting faces widening toward the outlet 8. Therefore, over the overall length between the inlet 7 and the outlet 8, cooling air is directed horizontally to the vehicle body rear side without any variation of an opening cross section area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation device for an industrial vehicle such as a forklift, and more particularly to a ventilation device provided for discharging cooling air used for cooling an engine to a rear side of a vehicle body.

[0002]

2. Description of the Related Art FIG. 5 shows a ventilation device in an engine type forklift. As shown in the figure, a radiator 22 for cooling the engine 21 is mounted in an engine room of the vehicle body, and cooling air from a cooling fan 23 driven (or electrically driven) by the engine 21 is supplied to the radiator 22. The cooling air is blown to cool, and the cooling air after passing through the radiator 22 is discharged to the rear of the vehicle body through a ventilation path 25 provided in a counter weight 24 mounted on the rear part of the vehicle body.

However, when the cooling air discharged from the ventilation passage 25 is not provided with directivity in the discharging direction, the cooling air is dispersed in all directions and winds up dust on the floor and blows to the operator during back running ( The driver's seat is counter weight 24
(Set slightly forward above). For this reason, a ventilation device has been proposed in which the cooling air discharged from the ventilation passage 25 has directivity.
196725 can be mentioned. The ventilation device described in this publication is configured such that the opening cross-sectional area of the discharge passage is sharply reduced near the outlet, and a bent portion is provided on the upper surface to discharge the cooling air downward.

[0004]

The ventilation device described in the above publication is effective in preventing the cooling air from being blown to the operator, but since the cooling air is concentrated and blown out to the floor side, dust is not generated. In addition, there is a problem that the wind-up of the cooling air is promoted, and the discharge effect of the cooling air is impaired due to the throttle effect at the outlet, thereby lowering the cooling performance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to prevent dust from being rolled up and sprayed on an operator without impairing the cooling performance. An object of the present invention is to provide a ventilation device for an industrial vehicle.

[0006]

Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. That is, the invention of claim 1 is a ventilation device for an industrial vehicle, wherein a counterweight mounted on a rear part of the vehicle body has a ventilation path for discharging cooling air after passing through the radiator to the rear of the vehicle body. The outlet is formed as a horizontally elongated slot with the same opening cross-sectional area as the inlet, and the upper and lower walls are formed with slopes that narrow toward the outlet while keeping the opening cross-sectional area constant over the entire length of the ventilation path. And

According to the first aspect of the present invention, since the cross-sectional area of the opening of the ventilation passage is constant over its entire length, the cooling air can be discharged smoothly without impairing the ventilation. Thus, required cooling performance can be secured. In addition, the outlet is a horizontally long slot, and the upper and lower walls of the ventilation path are formed with slopes that narrow toward the outlet. Straight directivity is given by merging with the flow flowing in the direction. For this reason, it becomes possible to discharge the cooling air from the exit toward the rear of the vehicle body in a substantially horizontal direction, and it is possible to prevent or reduce the blowing to the operator and the curling of dust on the floor surface. In addition, since the exit is formed as a horizontally long slot, the distance from the exit to the driver's seat and the floor surface is increased, which also enhances the effect of preventing the operator from spraying and dust from rolling up on the floor surface. .

According to a second aspect of the present invention, in the ventilating device for an industrial vehicle according to the first aspect, the outlet is formed in a horizontally elongated rectangular shape, and the right and left side wall surfaces of the ventilation path expand toward the outlet. It is characterized by comprising. When such a configuration is adopted, the ventilation passage is formed in a simple linear shape having no curved surface, and therefore, the productivity in the case where the counterweight is manufactured by casting is less likely to be impaired.

[0009]

Embodiments of the present invention will be specifically described below with reference to the drawings. The schematic configuration of the ventilation device in the forklift is as shown in FIG. That is, a radiator 3 for cooling the engine 2 is mounted in an engine room of the vehicle body 1, and a cooling fan 4 (or an electric motor) driven by the engine 1 with respect to the radiator 3.
The cooling air blown by the radiator 3 is cooled, and the cooling air after passing through the radiator 3 is discharged to the rear of the vehicle body through a ventilation path 6 provided in a counter weight 5 mounted on the rear part of the vehicle body.

Thus, in the ventilation device according to the present embodiment, as shown in FIGS. 2 to 4, the ventilation passage 6 provided in the counterweight 5 is used for cooling air discharged from the ventilation passage 6. It is configured so that directivity can be given straight to the rear of the vehicle body without impairing ventilation. The details will be described below.

FIG. 4 shows the cross-sectional shape of the opening of each part of the ventilation passage 6 along each cutting line in FIG. 3, and FIG.
4 is formed in a rectangular shape slightly longer in the horizontal direction, and the outlet 8 shown in FIG. 4C is formed in a rectangular shape that is much more narrow in the horizontal direction than the inlet 7, and FIG. Is formed in a rectangular shape having a lateral length approximately halfway between the inlet 7 and the outlet 8. In the present embodiment, the entrance 7 is set to a rectangle having an aspect ratio of about 1: 2, and the exit 8 is set to a rectangle having an aspect ratio of about 1: 8. The ventilation passage 6 is set so that its opening cross-sectional areas are all equal over the entire length including the inlet 7 and the outlet 8. That is, in the present embodiment, as shown in FIG. 2, the upper and lower wall surfaces 6a and 6b are formed by slopes gradually narrowing toward the outlet 8, and correspondingly, as shown in FIG. The opening cross-sectional area is set to be equal by forming the wall surface 6c with a slope gradually expanding toward the outlet 8.

The ventilation device according to the present embodiment is constructed as described above. Therefore, the cooling air after passing through the radiator 3 used for cooling the engine 2 passes through the ventilation passage 6. It is discharged to the rear of the vehicle. In this case, since the opening cross-sectional area of the ventilation passage 6 is constant with respect to the entire length from the inlet 7 to the outlet 8, good ventilation is obtained, and the cooling air is smoothly discharged, so that the required cooling Performance can be easily ensured.

The ventilation path 6 has upper and lower walls 6a, 6a.
The cooling air discharged from the outlet 8 has a downward flow along the upper wall surface 6a as shown in FIG. And the upward flow along the lower wall surface 6b is directed to the resultant direction of the two flows determined by merging, that is, the substantially horizontal direction. For this reason, as a result of the cooling air being discharged straight to the rear of the vehicle body, lifting of dust on the floor surface and blowing to the operator are prevented or reduced. Since the left and right side walls 6c of the ventilation path 6 are slopes expanding toward the outlet 8, as shown in FIG. 3, cooling air is discharged to the side of the vehicle body to some extent. No significant adverse effects occur.

Further, according to the present embodiment, since the outlet 8 of the ventilation passage 6 is formed in a horizontally long rectangle, the distance from the lower edge of the opening of the outlet 8 to the floor surface and the operation from the upper edge of the opening of the outlet 8 are increased. Since the distances to the seats are larger (farther) than in the related art, the effect of preventing or reducing the lifting of dust on the floor surface and the blowing to the operator is further enhanced.

By the way, the counterweight 5 is generally a cast product. Therefore, in consideration of its formability, it is desirable that the shape of the ventilation path 6 be simple.
In this regard, according to the present embodiment, the ventilation path 6 has the entrance 7,
Since the shape of the counterweight 5 is rectangular and has a straight shape without a curved surface and the slope between the entrances 7 and 8 is continuous, the formability of the counterweight 5 is not impaired.

The present invention is not limited to the illustrated embodiment, but can be appropriately modified without departing from the gist of the present invention. For example, in the present embodiment, as shown in FIG. 2, the inclination angle of the upper wall surface 6a in the ventilation path 6 is set to be slightly more acute than the inclination angle of the lower wall surface 6b (with respect to the vertical line). The slope angle of the upper wall surface 6a and the lower wall surface 6b of the ventilation path 6 may be matched, or may be slightly changed up and down in consideration of the direction of discharging the cooling air. Further, the ratio of the length and width of the rectangle of the entrance 7 and the exit 8 is merely an example, and can be changed as needed.

The shape of the outlet 8 does not necessarily have to be rectangular, but may be oval or rhombic. On the other hand, the shape of the inlet 7 may be any shape as long as it can be molded, and may be a vertically long shape.

[0018]

As described in detail above, according to the present invention,
It is possible to provide a ventilation device for an industrial vehicle which is effective in preventing dust from being wound up and blown to an operator without impairing the cooling performance.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a ventilation device of a forklift.

FIG. 2 is a longitudinal sectional view showing a shape of a ventilation path.

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

4A and 4B are cross-sectional views illustrating cross-sectional shapes of openings of respective portions of a ventilation path, where FIG. 4A is a cross-sectional view taken along line BB of FIG. 3 and FIG.
3C shows a cross section taken along the line CC, and FIG. 3C shows a cross section taken along the line DD in FIG.

FIG. 5 is an explanatory view of a ventilation device in a conventional forklift.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Body 2 ... Engine 3 ... Radiator 4 ... Cooling fan 5 ... Counterweight 6 ... Ventilation path 7 ... Inlet 8 ... Outlet

Claims (2)

[Claims] 1. A ventilation device for an industrial vehicle, comprising: a counterweight mounted on a rear portion of a vehicle body, and a ventilation path for discharging cooling air after passing through a radiator to a rear side of the vehicle body, wherein an outlet of the ventilation path is an inlet. An industrial vehicle characterized in that it is formed in a horizontally long slot having the same cross-sectional area as the opening, and the upper and lower wall faces are narrowed toward the exit while maintaining the opening cross-sectional area constant over the entire length of the ventilation path. Ventilation equipment. 2. The ventilation device for an industrial vehicle according to claim 1, wherein said outlet is formed in a horizontally elongated rectangular shape, and both left and right side walls of the ventilation path are formed as slopes extending toward the outlet.