JP4425736B2 - Air guide for intake duct - Google Patents

Description

  The present invention relates to an air guide for an intake duct that introduces air into an intake system of an engine, and more particularly to an air guide for an intake duct that prevents high-temperature air from being sucked into an engine room by the intake duct.

Conventionally, in a cab-over type truck in which an engine is mounted below a cab, an air cleaner is attached to a chassis frame at the rear of the engine room, and an air intake duct for introducing air is connected to the air cleaner.
Conventionally, various proposals have been made regarding this type of air intake duct. For example, Patent Document 1 aims to prevent moisture such as rainwater from flowing into the air intake duct during weather such as rain and snow. An intermediate opening is provided in the vertical pipe whose upper end opening is bent toward the front of the vehicle, a hollow box is attached to the vertical pipe so as to surround the intermediate opening, and the engine An intake device is disclosed in which an intake duct (intake intake pipe) connected to an intake pipe is attached to communicate with the inside of the box.
Japanese Patent Laid-Open No. 10-318057

However, in the above-described intake device, the upper end opening of the vertical pipe opens toward the front of the vehicle, and the intake duct that is generally used today has an intake opening at the rear of the engine room of the cab. Due to the structure, the air heated by the engine mounted under the cab is sucked in by the intake duct, and the engine has a problem that hot air is sucked into the engine.
Thus, when such high temperature air is taken into the engine, the combustion temperature becomes high, black smoke in the exhaust gas increases, engine output decreases, etc. Has been.

  The present invention has been devised in view of such circumstances, and provides an air guide for an intake duct that prevents intake of high-temperature air from the engine room by the intake duct and enables intake of low-temperature outside air. Objective.

  In order to achieve such an object, an air guide for an intake duct according to claim 1 surrounds the intake opening of the intake duct and has an intake intake opening on the downstream side in the flow direction of high-temperature air from the engine room. The inlet duct of the intake duct is formed in a box shape having an opening at the top, and the opposing side wall and bottom are extended downstream in the flow direction of the high-temperature air, and the intake intake and the intake duct of the intake duct are During this period, a distance for preventing the hot air from flowing in from the intake port is secured.

  The invention according to claim 2 is the air guide of the intake duct according to claim 1, wherein a foamed polyurethane that prevents the inflow of high-temperature air in contact with the outer periphery of the intake duct is attached to the intake port insertion opening. It is characterized by that.

According to the first aspect of the invention, since the high temperature air from the engine room does not flow into the intake duct by the air guide, and low temperature outside air is drawn into the engine from the intake air intake of the air guide, the intake air temperature is reduced. Therefore, it is possible to ensure a predetermined engine performance.
According to the second aspect of the invention, the polyurethane foam attached to the air inlet insertion port comes into contact with the outer periphery of the air intake duct (air intake port) to prevent the inflow of hot air into the air guide. Air is not taken into the engine, and a predetermined engine performance can be ensured by reducing the intake air temperature.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 3 show an air intake duct 3 to which an air guide 1 according to an embodiment of claims 1 and 2 is mounted and an air cleaner 5 to which the air intake duct 3 is connected. As shown in FIG. Is formed in a cylindrical shape, and is attached to a chassis frame 11 at the rear of an engine room 9 of a cab over type truck (hereinafter referred to as “truck”) 7 via a mounting bracket or the like. Is arranged on the left side of the cab 13 along the line.

  As shown in FIGS. 1 to 3, a substantially L-shaped intake duct 3 in plan view is connected from the peripheral wall of the central side of the cab 13 of the air cleaner 5 to the rear side of the track 7. The intake port 15 side of the intake duct 3 rises upward along the air cleaner 5 in a substantially L shape in a side view, and the intake port 15 of the intake duct 3 extends in the left-right direction of the truck 7 on the left side of the cab 13. It has a shape that is opened downward in a rectangular shape. The air guide 1 according to this embodiment is attached to the intake port 15 to prevent the intake port 15 from sucking high-temperature air from the engine room 9.

  As shown in FIGS. 1, 3 and 5, the air guide 1 is formed by welding three side walls 17, 19, 21 and a bottom plate 23 surrounding the intake port 15 of the intake duct 3 which opens downward. The intake air intake 25 is opened on the downstream side in the flow direction of the high-temperature air from the engine room 9, and the intake port 27 of the intake duct 3 is formed in a box shape in the upper part. Then, the intake port insertion port 27 is partitioned from the intake port 25 by a flat reinforcing strut plate 29 laid over the opposite side walls 17 and 19 so that the intake port 15 can be inserted. A rectangular opening is formed along the outer shape of the mouth 15.

Further, a flat foamed polyurethane 31 that contacts the outer periphery of the intake port 15 (intake duct 3) is attached to the intake port insertion port 27 on the upper inner periphery of the side wall 17. The inflow of hot air into the inside is prevented.
As shown in FIG. 1, the air guide 1 has an intake inlet 25 that opens to the left outside of the cab 13, that is, downstream in the flow direction of the high-temperature air from the engine room. The air inlet 15 of the air intake duct 3 is inserted into a peripheral member (not shown) via a bracket, but the opposing side walls 17 and 19 and the bottom plate 23 are connected to the hot air as shown in FIGS. A distance is secured between the intake intake 25 and the intake port 15 of the intake duct 3 to prevent hot air from flowing in from the intake intake 25.

However, as shown in FIG. 1, in this embodiment, in order to avoid interference with a fender (not shown), a notch 33 is provided at the upper end of the side wall 19 extending downstream in the flow direction of high-temperature air. .
The present embodiment is configured as described above, and air is introduced into the engine through the intake port 15 of the intake duct 3 and sucked into the engine, and air heated by the engine is supplied from the engine room 9 to the intake duct 3 as in the prior art. As described above, the intake port 15 is covered with the air guide 1, and the air guide 1 has the intake port 25 outside the left side of the cab 13, that is, the engine room. 9 is opened to the downstream side in the flow direction of the high-temperature air, and the opposing side walls 17 and 19 and the bottom plate 23 are extended to the downstream side in the flow direction of the high-temperature air so that the intake air intake 25 and the intake duct 3 are extended. Since a distance to prevent the hot air from the intake air intake 25 from wrapping around is secured between the intake air inlet 15 and the intake air 15, the high temperature air from the engine room 9 does not flow from the intake air intake 25 to the intake air port 15. Intake intake 5 from the low temperature of the outside air is to be the intake to the engine.

Further, the flat foamed polyurethane 31 attached to the intake port 27 contacts the outer periphery of the intake port 15 (intake duct 3) to prevent inflow of high-temperature air into the air guide 1.
Therefore, according to the present embodiment, high-temperature air is not sucked into the engine, and as a result, it is possible to ensure predetermined engine performance by reducing the intake air temperature.

It is a perspective view of an air intake duct and an air cleaner equipped with an air guide according to an embodiment of claim 1 and claim 2. It is a perspective view of an air intake duct and an air cleaner equipped with an air guide. It is a side view of an air intake duct and an air cleaner equipped with an air guide. It is a side view of a truck. It is a whole perspective view of an air guide.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air guide 3 Intake duct 5 Air cleaner 7 Truck 9 Engine room 11 Chassis frame 13 Cab 15 Inlet port 17, 19, 21 Side wall 23 Bottom plate 25 Intake inlet 27 Inlet inlet insertion port 29 Reinforcement strut plate 31 Foam polyurethane

Claims (2)

  Surrounding the inlet of the intake duct, it is formed in a box shape with an intake intake opening on the downstream side in the flow direction of hot air from the engine room, and an intake inlet opening of the intake duct opening at the top. A side wall and a bottom portion that extend to the downstream side in the flow direction of the high-temperature air ensure a distance between the intake intake and the intake port of the intake duct that prevents the hot air from flowing in from the intake intake. An air guide for an intake duct characterized by that. 2. An air guide for an intake duct according to claim 1, wherein a foamed polyurethane that prevents the inflow of high-temperature air by contacting the outer periphery of the intake duct is attached to the intake opening.

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