JP2018131109A - Shield structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield structure that is able to hinder deterioration of efficiency of an internal combustion engine.SOLUTION: One embodiment of the present disclosure is directed to a shield structure used together with an intake duct provided along a cab rear panel of a cap-over type vehicle, comprising: a cab back cover mounted above an internal combustion engine of the vehicle and configured to guide downward hot air generated in the internal combustion engine; a lower member having a first face connecting a first position above the cab back cover and a second position behind the first position; and an upper member being mounted above the cab back cover, and having a second face connecting a third position higher than the first position and a fourth position in the vicinity of the second position.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a shielding structure that shields hot air generated in an internal combustion engine of a cab-over type vehicle.

  Some conventional cab-over type vehicles are provided with an intake duct extending in the vertical direction along the cab rear panel. The intake duct supplies air taken from the intake port to an intake system of an internal combustion engine mounted under the cab (see, for example, Patent Document 1).

JP 2005-351236 A

  However, in the cab-over type vehicle as described above, air heated by an internal combustion engine or the like (hereinafter referred to as hot air) may rise and flow from the intake port of the intake duct. If hot air flows into the intake duct, the efficiency of the internal combustion engine may deteriorate.

  An object of this indication is to provide the shielding structure which can suppress the efficiency deterioration of an internal combustion engine.

  One form of the present disclosure is a shielding structure that is used together with an intake duct provided along a cab rear panel of a cab-over type vehicle, and is attached above the internal combustion engine of the vehicle, and the hot air generated in the internal combustion engine is lowered below A lower member having a first surface that connects a first portion above the cab back cover, a second portion behind the first portion, and an upper portion of the cab back cover. And is directed to a shielding structure including an upper member having a second surface that connects a third location above the first location and a fourth location near the second location.

  According to the present disclosure, it is possible to provide a shielding structure capable of suppressing deterioration in efficiency of an internal combustion engine.

FIG. 1A is a perspective view illustrating a main part of a cab-over type vehicle according to the present disclosure. FIG. 1B is a perspective view showing the vehicle with the cab back cover of FIG. 1A removed. FIG. 2 is an enlarged rear view of the cab back cover and its periphery in FIG. 1A. FIG. 3 is an enlarged right side view of the cab back cover of FIG. 2 and its periphery. 4 is a view of the cab back cover along the line A-A 'in FIG.

  Hereinafter, the shielding structure of the present disclosure will be described in detail with reference to the drawings.

<1. Definition>
In each figure, the x-axis, y-axis, and z-axis are orthogonal to each other. The x-axis indicates the front-rear direction from the front to the rear of the cab-over type vehicle (hereinafter simply referred to as vehicle) V. The y-axis direction indicates the left-right direction from the left to the right of the vehicle V. Further, the z-axis direction indicates a vertical direction from the bottom to the top of the vehicle V.

  Table 1 below shows the meaning of acronyms and abbreviations used in the following description.

<2. Overview of the cab-over type vehicle of the present disclosure>
A vehicle V is illustrated in FIGS. 1A to 4. In the vehicle V, at least the internal combustion engine 3 is disposed below the cab 1. In the present disclosure, it is assumed that a post-processing device (not shown) is also disposed below the cab 1. An intake duct 31 is provided along the cab rear panel 11 of the cab 1. In the present disclosure, the intake duct 31 is provided on the right rear side of the cab rear panel 11.

  Air flows into the intake duct 31 from the intake port 31a. An air cleaner 31b is provided in the middle of the intake duct 31, and this air cleaner 31b removes dust from the air flowing into itself. The air sent out from the air cleaner 31 b is sent into the internal combustion engine 3.

  The internal combustion engine 3 is a diesel engine, for example. In the internal combustion engine 3, when the piston is lowered to the bottom dead center and the intake valve is opened, air from the intake duct 31 is taken into the combustion chamber. Thereafter, the piston rises to the top dead center, the air in the combustion chamber is compressed, and the fuel is supplied to the combustion chamber by the injector in a high temperature state. As a result, the fuel self-ignites in the combustion chamber and pushes the piston down to the bottom dead center. Thereafter, when the piston is raised to the top dead center and the exhaust valve is opened, the gas in the combustion chamber is discharged to an exhaust system (not shown).

  The aftertreatment device is provided in the exhaust system. Examples of the post-processing device include DPF and SCR. The DPF collects PM contained in the exhaust gas. The SCR detoxifies nitrogen oxides contained in the exhaust gas. The exhaust gas processed by the post-processing device is discharged into the atmosphere through a muffler or the like (not shown).

<3. Shielding structure of the present disclosure>
Further, the air around the internal combustion engine 3 and the aftertreatment device is warmed by the heat generated from them. Among such hot airs, for example, there is one that rises immediately after the vehicle V exits from the lower side of the cab 1 while traveling. If no measures are taken against the rising hot air, the hot air flows into the intake duct 31 from the intake port 31a. Therefore, in the present disclosure, the vehicle V includes the cab back cover 13 as a part of the hot air shielding structure 5.

  The cab back cover 13 is made of metal or the like, and is attached above the internal combustion engine 3 as can be seen from FIG. 1A and the like. The cab back cover 13 guides hot air generated in the internal combustion engine 3 or the like and passing through the lower part of the cab 1 downward. Hereinafter, a configuration example of the cab back cover 13 will be described in detail.

  As shown in FIGS. 2 to 4, the cab back cover 13 includes an attachment plate portion 13 a. The attachment plate portion 13a is a flat plate extending in the left-right direction and having a plurality of through holes. The cab back cover 13 is fixed to the rear mounting 15 (see FIG. 1B) or the like above the internal combustion engine 3 with bolts or the like passed through the through holes of the attachment plate portion 13a. The cab back cover 13 may be fixed to the cab rear panel 11, a cross member (not shown), or another bracket (not shown).

  The cab back cover 13 further includes a back panel 13b, a side panel (left) 13c, and a side panel (right) 13d. As shown in both FIGS. 3 and 4, the back panel 13 b extends rearward from the lower end of the mounting plate portion 13 a and bends downward. As shown in FIGS. 4 and 3, the side panel (left) 13c and the side panel (right) 13d extend forward from the left end and the right end of the back panel 13b. Note that the lower end of the cab back cover 13 is opened in order to guide the hot air from below the cab 1 downward and then discharge it to the rear.

<4. Configuration of lower member and upper member>
The cab back cover 13 is provided for the purpose of preventing the inflow of hot air into the intake duct 31. However, as shown in FIG. 4, hot air may leak from the gap G1 generated in front of the mounting plate portion 13a and flow into the intake port 31a. In order to cope with this problem, the present disclosure includes a lower member 17 and an upper member 19 as another part of the shielding structure 5 of the vehicle V, as shown in FIGS.

  As shown in FIGS. 3 and 4, the lower member 17 has a first location P1 above the cab back cover 13 as a base end and a second location P2 behind the first location P1 as a distal end. In the lower member 17, the first location P1 and the second location P2 are connected by the first surface S1. Hereinafter, a configuration example of the lower member 17 will be described in detail.

  In the present disclosure, the upper end of the attachment plate portion 13a is an example of the first location P1. A location that is separated from the first location P1 by a predetermined distance substantially straight rearward is an example of the second location P2. The first surface S1 includes such a plane that connects the first location P1 and the second location P2 and is substantially parallel to the xy plane.

  The upper member 19 is attached above the cab back cover 13 and has a third location P3 above the first location P1 as a base end and a fourth location P4 near the second location P2 as a distal end. In the lower member 17, the third place P3 and the fourth place P4 are connected by the second surface S2. The second surface S2 closes the gap G1 and faces the first surface S1 across the space. The second surface S2 further connects the third location P3 and the fourth location P4. Hereinafter, a configuration example of the upper member 19 will be described in detail.

  More specifically, as shown in FIGS. 2 to 4, the upper member 19 extends in the lateral direction along the vicinity of the lower edge of the cab back panel 11. In the upper member 19, the second surface S <b> 2 substantially extends backward from the third location P <b> 3 on the cab back panel 11, then bends, and extends downward. The second surface S2 is further bent rearward in the vicinity of the second location P2 to reach the fourth location P4.

<5. Action and effect of lower member and upper member>
In the shielding structure 5, the hot air leaking from the gap G1 flows into the space interposed between the first surface S1 of the lower member 17 and the second surface S2 of the upper member 19, and further rises. . Here, since the second surface S2 closes the gap G1, the hot air is bent at the uppermost portion of the space, flows along the second surface S2, and then flows from the gap G2 to the outside of the space. Discharged. Here, as apparent from the above, since the gap G2 is opened toward the rear of the vehicle V, the discharged hot air does not go toward the intake port 31a. Accordingly, it is possible to provide the shielding structure 5 capable of preventing the internal combustion engine 3 from flowing out from the lower side of the cab 1 but flowing into the intake duct 31 and suppressing the deterioration of the efficiency of the internal combustion engine 3.

<6. Addendum>
In the above description, the first surface S1 has been described as a plane substantially parallel to the xy plane. However, the present invention is not limited thereto, and in the lower member 17, the first location P1 is connected to the upper end of the attachment plate portion 13a of the cab back cover 13, and the first surface S1 is connected to the vehicle V from the first location P1. It may extend toward the diagonally lower rear of the second position P2. Such a first surface S1 is indicated by a dotted line in FIG.

  Further, each of the surfaces S1 and S2 may be a flat surface or a curved surface.

  Further, the lower member 17 may be integrated with the cab back cover 13 or may be a separate body.

  The shielding structure of the present disclosure can suppress deterioration in efficiency of the internal combustion engine, and is suitable for vehicle use.

V cab over type vehicle 11 cab rear panel 13 cab back cover 17 lower member P1 first location P2 second location S1 first surface 19 upper member P3 third location P4 fourth location S2 second surface G2 gap 3 internal combustion engine 31 intake duct 5 Shielding structure

Claims (4)

A shielding structure used with an intake duct provided along a cab rear panel of a cab over type vehicle,
A cab back cover that is attached above the internal combustion engine of the vehicle and guides the hot air generated in the internal combustion engine downward;
A lower member having a first surface connecting the first location above the cab back cover and the second location behind the first location;
An upper member attached above the cab back cover and having a second surface connecting the third location above the first location and the fourth location near the second location;
Shielding structure with The second surface guides hot air generated in the internal combustion engine and flowing out from the vicinity of the first location to a gap between the second location and the fourth location,
The shielding structure according to claim 1. In the first surface, the first location is connected to the cab back cover, and the first surface extends from the first location toward the rear of the vehicle to reach the second location,
The shielding structure according to claim 1. In the first surface, the first portion is connected to the cab back cover, and the first surface extends obliquely downward and rearward from the first portion to the second portion. To
The shielding structure according to claim 1.

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