JP2592250Y2 - Engine cooling device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproofing / cooling device for an engine room in an engine type industrial vehicle such as a forklift or a shovel loader.

[0002]

2. Description of the Related Art Conventionally, an industrial vehicle having a structure in which the lower side of an engine room is opened has a problem that noise (mainly engine sound) emitted from the engine room is loud and various facilities in the engine room are stained. As a means for solving the problem, a low-noise specification in which the undersurface of the engine room is covered by an undercover is provided. FIG. 7 shows a structural diagram of a conventional undercover. In the figure, a is an undercover, b is a sound absorbing material, c is a radiator, d is a counterweight, e is an engine, and f is a cooling fan. Regarding the undercover structure of industrial vehicles, see, for example,
Nos. 125648 and 2-88826.

[0003]

[Problems to be solved by the invention] However, in the case of the above-described closed structure with the under cover, insufficient air intake causes engine overheating due to insufficient engine cooling. 6
In Japanese Patent Application Laid-Open No. 2-125648, the front edge of the under cover attached to the lower end of the side frame is bent obliquely downward to form an air introduction portion. The under cover is provided with a plurality of air inlets arranged in front and rear to enhance the cooling effect. By the way, in the above concept, when the industrial vehicle, particularly a forklift, travels, the air introduced from the front edge of the undercover passes above the undercover, that is, passes through the engine bottom and obliquely upwards along the air guide portion at the rear end of the undercover. Guided to the radiator in position to cool the radiator. Since most of the introduced air is guided to the radiator through the bottom of the engine, there has been a problem that low-temperature air cannot sufficiently scavenge the hot air on the engine wall surface (side surface) and upper surface.

In Japanese Utility Model Laid-Open No. 2-88826, air is introduced into an engine room by providing a guide member for flowing air flowing from an intake formed in an under cover toward a wall surface of a hydraulic oil tank. As a result, the contact of the cooling air with the wall surface of the hydraulic oil tank is positively activated, and the heat radiation effect of the hydraulic oil is positively performed. However, in this case, although the hydraulic oil tank is cooled, most of the introduced air flows along the hydraulic oil tank to the radiator at the rear position. However, there is a problem that the hot air on the upper surface cannot be sufficiently scavenged.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an undercover that covers the lower surface of an engine room with its front end inclined downward with respect to a side frame, and its front end is formed with a side. An air introduction portion is formed below the frame bottom and attached to the lower portion of the side frame, and the rear end of the undercover is brought into contact with the lower portion of the shroud so that air introduced from the front end of the undercover does not leak to the radiator lower portion. As well as
A sound absorbing material is attached to the upper surface of the under cover, and a plurality of air guide members are provided in front, rear, left and right.

[0006]

Therefore, when the vehicle is running, air is actively taken in from the front end of the undercover into the engine room above the undercover, and the introduced air is taken into the rear end of the undercover not only at the bottom of the engine, that is, at the bottom of the engine but also at the engine wall (side surface). Actively guides the air to the upper surface, works to sufficiently scavenge the hot air in each part, the hot air is guided to the radiator behind the under cover, and the wind flow under the engine room is reduced by the engine. The radiator cooling airflow is guided to the radiator at the diagonally upper position along the air guide at the rear end of the undercover due to the absorption effect caused by the pressure effect at the engine bottom in front of the fan by contracting and increasing the speed at the bottom and undercover. Act to increase.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Two embodiments of the present invention will be described below with reference to the drawings. FIG. 8 is a side view showing the whole of the engine type forklift. FIG. 1 is a structural view of an undercover showing a first embodiment of the present invention, FIGS. 2 and 3 are explanatory views of mounting the undercover, and FIGS. 4, 5 and 6 are undercovers showing a second embodiment. FIG. 7 is a structural view of a conventional undercover.

In the first embodiment, the left and right side frames 2
In the engine room surrounded by
A cooling fan 5 and a radiator 6 are arranged.
As a result, the hot air in the engine room passes through the radiator 6 and is discharged outside the vehicle through the exhaust hole 3a in the counterweight 3. 1 and 2 below the engine room.
As shown in FIG. 3, an under cover 7 for covering the lower part of the engine room is arranged.
The left and right edges are attached to the lower end of the inner vertical plate 2 a of the side frame 2 via the bracket 8. As shown in FIGS. 2 and 3, flanges 2 e are formed at the lower ends of the inner vertical plates 2 c of the left and right side frames, and are located below the side frame bottoms 2 d and project inward and horizontally. The flange 2 e is sandwiched between the under cover 7 and the bracket 8 from above and below and tightened with the bolts 9 to attach the under cover 7 to the left and right ends of the side frame 2. Note that the nut 10 is fixed to the bracket 8 in advance.

Therefore, as shown in FIG. 1, the under cover 7 has its front end obliquely downward substantially over the entire length of the side frame 2 and its front end 11 is positioned below the bottom 2 d of the side frame 2. It is bent and fixed in parallel to the bottom 2d of the frame 2 to form an air introduction portion during traveling, and the rear end of the undercover is directed obliquely upward over substantially the entire width for guiding the introduced air to the radiator 6. A bent air guide portion 12 is formed, and a rear end 13 of the air guide portion 12 is formed so as to be parallel to the lower portion 15 of the shroud. The air guide portion 12 is sealed so that air introduced from below the front end of the undercover does not leak to the lower portion of the radiator 6. doing. Further, a sound absorbing material 14 is adhered to the upper surface of the under cover 7 fixed with the front end portion obliquely downwardly over substantially the front surface.

This embodiment is constructed as described above, and is formed by the front end 11 of the under cover 7 located below the bottom 2d of the side frame 2 as shown by the arrow in FIG. Outside air is guided from the air introduction section to the upper surface of the undercover 7. That is, the traveling wind during traveling is actively taken into the engine room, and the taken-in air is guided from the lower part of the engine to the engine wall surface along the under cover 7 attached diagonally to the side frame 2, The radiator 6 is guided obliquely upward along the air guide portion 12 at the rear end of the under cover 7, cools the radiator 6, and is discharged to the rear of the vehicle body from the exhaust hole 3a. The sound absorbing material 14 bonded to the upper surface of the under cover 7 absorbs noise such as engine noise and transmission noise, and reduces the leakage of the noise to the outside of the vehicle body.

Next, a second embodiment of the present invention will be described with reference to FIGS.
An air guide member 16 is formed at a location. That is, the front end 11 of the undercover located below the bottom 2 d of the side frame 2 is connected to the bottom 2 d of the side frame 2.
2 to form an air introduction portion fixed as shown in FIG. 2, and on the upper surface of the under cover 7 at the rear thereof, having a length in the vehicle width direction and an angle obliquely upward. Two air guide members 16 projecting in an inclined manner are formed at appropriate intervals.

The engine heat balance largely depends on the flow path of air in the engine, and it is necessary to perform sufficient scavenging in the engine room. In the structure shown in FIG. The air volume reaching the radiator 6 along the upper surface of the under cover 7, that is, along the bottom of the engine 4, is relatively large. Therefore, an air guide member 16 for changing the air flow path in the engine room so as to positively pass the taken air through the engine wall surface to deprive the heat of the engine wall surface and thereafter cool the radiator 6 is provided. Thus, the introduced air can be effectively used for cooling the engine, and the cooling effect can be further enhanced. Although not shown, it goes without saying that any number of the air guide members 16 provided on the upper surface of the under cover 7 may be protruded in an inclined manner at an appropriate angle with an appropriate interval between left, right, front and rear.

[0013]

As described in detail above, the present invention relates to an engine-type industrial vehicle, in which an under cover for covering a lower portion of an engine room is inclined downward at a front end with respect to a side frame, and a front end of the under cover is formed at a bottom of the side frame. By providing an air introduction section mounted on the side frame at a lower position, air was actively taken in from the front end of the undercover into the engine room above the undercover when the vehicle was running, and was introduced at the rear end of the undercover. Actively guides the outside air not only to the lower part of the engine room, that is, the engine bottom, but also to the engine wall (side surface) and the upper surface, so as to sufficiently scavenge the hot air in each part, and to reduce the wind flow at the lower part of the engine room. The air flow contracts at the bottom and under cover to increase the speed, causing a pressure drop at the bottom of the engine in front of the fan. Prevents overheating caused by insufficient cooling, which is a problem with conventional low-noise vehicles, without impairing the soundproofing effect and the effect of preventing pollution in the engine room by increasing the radiator cooling air flow due to the suction effect And the engine cooling effect is enhanced.

[Brief description of the drawings]

FIG. 1 is a structural view of an undercover showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view for explaining how to attach the under cover of FIG. 1;

FIG. 3 is a perspective view for explaining how to attach the under cover of FIG. 1;

FIG. 4 is a structural view of an under cover showing a second embodiment of the present invention.

FIG. 5 is a cross-sectional view for explaining how to attach the under cover of FIG. 4;

FIG. 6 is a perspective view for explaining how to attach the under cover of FIG. 4;

FIG. 7 is a structural view of a conventional undercover.

FIG. 8 is an overall side view of the engine-type forklift.

[Explanation of symbols]

 Reference Signs List 2 side frame 2d side frame bottom 4 engine 6 radiator 7 under cover 11 front end (under cover) 12 air guide (under cover) 13 rear end (under cover) 14 sound absorbing material 15 shroud lower part 16 air guide member

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60K 11/04 B62D 25/20 F01P 1/02

Claims (1)

(57) [Scope of request for utility model registration] 1. An air introducing portion, wherein an under cover that covers a lower surface of an engine room has a front end inclined downward with respect to a side frame, and the front end is positioned below a bottom of the side frame and attached to a lower portion of the side frame. And connect the rear end of the undercover with the lower part of the shroud.
Touch, the air introduced from the under cover front end,
Seal the radiator so that it does not leak under the radiator.
Attach a sound absorbing material to the upper surface of the
An engine cooling device for an industrial vehicle having a plurality of air guide members arranged in front, rear, left and right .