JPH0616157A - Structure for reducing back mud adhesion on van type vehicles - Google Patents

Abstract

(57) [Summary] [Purpose] The amount of mud adhered to the back of a van-type vehicle
It is reduced without deterioration of the d value. [Structure] Attach the cavity 2 around the back of the van 1,
Further, an upper vane 4a and a pair of left and right side vanes 4b are attached to the outside of the cavity 2. This allows
An air curtain is formed on the back surface of the van 1 to prevent a vortex formed behind the van from contacting the back surface of the van.
Further, since the cavity 2 is provided side by side, the Cd value does not deteriorate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for reducing the amount of adhered mud on the rear surface of a van-type vehicle, which prevents the rear surface of the van-type vehicle traveling on a wet road surface from being contaminated by the muddy water splashed by itself. Regarding

[0002]

2. Description of the Related Art Van-type vehicles, such as trucks (hereinafter referred to as van-type trucks) with a large van mounted on a cargo bed and buses, have a wall surface that is substantially vertical on the back surface when traveling on a wet road surface. The muddy water splashed up during the run and soiled the back. Such backside stains cause troublesome problems such as 1) impairing aesthetics, 2) obstructing rearward visibility, 3) time-consuming car washing, and the development of effective measures against mud adhesion is This is an important issue for improving the product appeal of van-type vehicles.

A conventional countermeasure against mud adhesion to the back surface of the van will be briefly illustrated and explained. For example, a cavity 2 may be provided around the back surface of the van 1 (FIG. 18A), or the lower surface of the back surface of the van 1 may be lowered. There is a type in which a continuous sagging rubber 3 is attached (FIG. 18B).

[0004]

However, according to the above-mentioned conventional measures, although there are some effects,
It wasn't always enough. That is, according to the running test result shown in FIG. 19, the countermeasure provided with the cavity 2 reduces the amount of mud adhered to the peripheral portion of the rear surface of the van 1 as compared with the original shape without the countermeasure (FIG. 19A). However, the effect does not extend to the center of the back surface (Fig. 19).
(B)). Also, with the measure in which the sagging rubber 3 is attached, the amount of mud adhered to the upper part of the rear surface of the van 1 is reduced, but the effect does not extend to all other parts (FIG. 19).
(C)). Note that FIG. 19 is a front view showing the back surface of the van 1, and each hatched portion is a mud adhering portion.

[0005]

SUMMARY OF THE INVENTION The present invention is for solving the above-mentioned problems, and in a back mud adhesion reducing structure for a van type vehicle in which a wall surface substantially vertical to the back surface is formed, a cavity is provided around the wall surface. A structure for reducing the amount of back mud adhered to a van-type vehicle, which is characterized by additionally providing a corner vane.

[0006]

According to the above-mentioned means, the mist-like muddy water that is scattered by the rotation of the tires and rides on the air current rolled up from the ground to form a vortex on the back side of the van, the air flow guided to the corner vanes is reflected on the back side of the van. By forming air curtain,
Since the contact with the back of the van is blocked, this muddy water can be prevented from adhering to the back of the van. Further, the deterioration of the Cd value cannot be avoided by mounting only the corner vanes, but the combination with the cavity can prevent the adhesion of muddy water without the deterioration of the Cd value. In this case, not only the squeezing shape but also the depth of the cavity is an important factor.

[0007]

An embodiment of the structure for reducing the amount of back mud adhered to a van type vehicle according to the present invention will be described with reference to the drawings.

FIG. 1A is a perspective view showing an outer appearance of a rear portion of a van type truck. A cavity 2 is provided around a rear surface of the van 1 (excluding a lower side), and the cavity 2 has an upper vane. 4a and a pair of left and right side vanes 4b are provided as corner vanes 4. As shown in FIG. 1 (b), the cavity 2 has a shape such that the rear end portion of the bun 1 is narrowed by inclining inward from the extension of the outer peripheral surface of the bun 1 by an angle α. Corner vane 4
A gap of an appropriate size is formed between the cavity 2 and the outer peripheral surface thereof, and its cross section has a shape capable of guiding the air flow generated by traveling in a direction substantially parallel to the rear surface of the van 1 (FIG. 1 (b)).
Then it is as a curved surface).

By adopting such a back mud adhesion amount reducing structure, mist-like muddy water scattered by the rotation of the tire does not reach the back surface of the van 1 and adhere to the back surface of the van. An air curtain is formed on the. That is, to briefly explain the process of mud adhesion, muddy water that scatters and scatters up on the back surface of the van 1 to form a vortex, which causes mud adhesion when it contacts the back of the van. Is. Therefore, if an air curtain is formed on the back surface of the van 1 to block the contact of the vortex with the back surface of the van 1, the mud can be prevented from adhering to the back surface of the van 1.

FIG. 2 shows the results of the wind tunnel test of the countermeasure vehicle shown in FIG. 1, in which smoke flow conditions are photographed and smoke density processing is performed by integration. It has been confirmed that the flow patterns in the actual vehicle running and the wind tunnel test are substantially the same, and therefore the flow pattern may be grasped in the wind tunnel test. Further, it can be judged that the smoke concentration distribution is closely related to the amount of stagnation of mist caused by actual muddy splashes and splashes of water, that is, the amount of deposits, and the amount of stagnation of mist near the rear end of the van in FIG. The smoke density is darker (darker) for large ones, and brighter (lighter) for less stagnant amount.

As shown in the test results of FIG. 2, a non-colored zone is formed on the back surface of the van 1, and this zone serves as an air curtain for the vortex flow of the mist. Can be completely prevented. The shapes of the cavities 2 and the corner vanes 4 used in this experiment are shown in FIG.
In (b), a = 300 mm, b = 180 mm, c
= 60 mm, α = 15 degrees, R = 120 mm, and the back surface of the van 1 to which these are mounted is a 2.45 m square. Further, the Cd value of the countermeasure vehicle shown in FIG. 1 is 0.98 when the original vehicle without countermeasure is set to 1, which is slightly improved. That is, in the countermeasure vehicle shown in FIG. 1, the amount of mud adhered on the back surface of the van 1 can be reduced without deteriorating the Cd value.

Next, FIGS. 3 to 7 show similar test results for other countermeasure vehicles and original vehicles.
Fig. 3 shows a case where only a pair of left and right side vanes 4b is attached, and the curling up from the ground is suppressed by the air curtain from the side, and the mud adhesion situation is significantly improved compared to the original vehicle of Fig. 7. To do. The wet area in this case is
The projecting part at the center of the back, that is, the door bar and the handle part, is extremely small. However, the Cd value becomes 1.2 as compared with the original value, which is greatly deteriorated.

FIG. 4 shows a case where only a single upper vane 4a is attached, and the curling up from the lower part of the vehicle is suppressed by the air curtain from the upper part, and the situation of mud adhesion in this case is also compared with the original vehicle. Greatly improved. In this case, the wetted region is located immediately below the upper vane 4a, and the Cd value is also deteriorated to the original ratio of 1.16. If the problem of the deterioration of the Cd value is ignored, the wetted region can be almost completely eliminated by adopting the double vane upper vane.

FIG. 5 shows a case where an upper vane 4a and a pair of left and right side vanes 4b are provided side by side, and an air curtain formed by both vanes provides a substantially complete measure against mud adhesion. However, the original ratio of Cd values is further deteriorated to 1.25, and it is important to solve this problem for practical use.

FIG. 6 shows a case in which the cavities 2 are provided on three sides except the lower side, which is improved as compared with the original vehicle, but there is no remarkable change as much as the corner vane described above. However, the grayscale processing result is bright as a whole, and it can be seen that the amount of stagnation of mist is small. The Cd value in this case was 0.91 as compared with the original ratio, which shows that the cavity 2 is effective for improving the Cd value.

From the above experimental results, the corner vane 4 has the drawback of deteriorating the Cd value even if it is effective as a mud adhesion countermeasure, and the cavity 2 on the other hand is effective for the reduction of the Cd value but is a mud adhesion countermeasure. It turns out that you can't have big expectations as. Therefore, particularly when the corner vanes 4 are fixed, it is preferable to provide the cavity 2 and the corner vanes 4 side by side, and it is possible to take a substantially complete mud adhesion countermeasure without deteriorating the Cd value. Even when only the corner vanes 4 are mounted as shown in FIGS. 3 to 5, by making the corner vanes 4 movable so that they can be stored in the van 1 at appropriate places, there is no fear of mud adhesion. On a road surface, the corner vane 4 may be stored for traveling with the Cd value given priority, and when traveling on a wet road surface, the corner vane 4 may be taken out to give priority to the mud adhesion countermeasure. The corner vane control at this time may be automatically switched using a sensor for detecting the wet state of the road surface or a vehicle speed sensor, or may be manually switched by a manual switch.

Next, a fixed type and a movable type of corner vane mounting structure will be briefly described with reference to the drawings.

FIG. 8 shows a fixed type corner vane and a cavity when the back surface of the van 1 is a double-sided fan, and a groove 5 for a hinge is provided in the cavity 2 and the side vanes 4b on both sides. It is provided. Further, FIG. 9 shows a mounting structure of a general fixed type corner vane, which is fixed to the cavity 2 by bolting via a bracket 6. The cross-sectional shape of the corner vane 4 is not limited to the curved surface shown, but may be, for example, a flat plate
It may be bent at three points so that both ends thereof become approximately 90 degrees.

10 to 15 show an example of the structure of a movable corner vane. 10 and 11 show
The corner vanes 4 that are integrally stored on the outside of the cavity 2 are slid upward (FIG. 10) or rotated (FIG. 11) by the operation of the actuator 7 to separate, and the air flow is generated between the cavity 2 and the corner vanes 4. Is configured to form a flow path of As the actuator 7,
A hydraulic cylinder, an electric motor, or the like can be used, and a structure in which the corner vane 4 is directly connected to the actuator 7 to operate and a structure in which the corner vane 4 is operated via a link 8 or a gear are also possible.

FIG. 12 shows a structure in which the corner vanes 4 are rotated to be stored inside the cavity 2.
(A) is a state where the corner vane 4 is out, and (b) is a stored state. The corner vane 4 is rotatably supported by a bracket 10 by a shaft 9,
May be operated by connecting it to an actuator (not shown).

13 to 15 show a structure in which an opening 11 which serves as a flow path for an air flow is provided in advance in the cavity 2, and the opening 11 is opened and closed by a movable corner vane 4 (actuator is not shown). ) Is shown. FIG.
Is a first embodiment in which the rotary shaft 12 supporting the corner vanes 4 is on the rear end side of the cavity 2, and (a) is the opening 1
1 shows a closed state, and (b) shows a state in which the opening 11 is opened and the function of the corner vane 4 is exhibited. 14
The rotating shaft 12 is located in the van 1 from the opening 11 of the cavity 2.
In the second embodiment on the side, a solid line corner vane 4 closes the opening 11, and a broken line corner vane 4 opens the opening 11 to show the function of the corner vane 4. Further, FIG. 15 shows a third embodiment in which the corner vane 4 slides in the front-rear direction to open and close the opening 11, and (a) shows a state in which the opening 11 is closed.
(B) shows a state in which the opening 11 is opened and the function of the corner vane 4 is exhibited.

FIG. 16 shows an example of a movable double corner vane structure.
The corner vanes 13 and 14 are slid, and the space between the cavity 2 and the corner vane 13 and the corner vane 1
Flow paths 15 and 16 are formed between 3 and 14. With such a double corner vane,
The air curtain formed on the back surface of the van 1 becomes more reliable.

[0023]

According to the above-mentioned structure for reducing the amount of adhered mud on the back surface of the present invention, by using the cavity and the corner vanes together, it becomes possible to prevent the adhesion of mud almost completely without deteriorating the Cd value, and van type vehicles. Has a great effect on improving the product strength of

[Brief description of drawings]

1A and 1B are views showing an embodiment of the present invention, in which FIG. 1A is a perspective view showing an outer appearance of a rear portion of a van type truck, and FIG.
It is sectional drawing which follows the -A line.

FIG. 2 is a diagram showing a smoke density processing result of a wind tunnel test by the vehicle of FIG.

FIG. 3A is a perspective view showing an outer appearance of a rear portion of a van-type truck to which only side vanes are attached, and FIG. 3B is a view showing a wind tunnel test smoke shading processing result of FIG. 3A.

FIG. 4A is a perspective view showing an outer appearance of a rear portion of a van truck to which only upper vanes are attached, and FIG. 4B is a view showing a result of wind tunnel test smoke shading processing of FIG.

FIG. 5 (a) is a perspective view showing an external appearance of a rear portion of a van type truck provided with an upper vane and a side vane, and FIG.
[Fig. 3] is a diagram showing the result of the wind tunnel test smoke shading processing in (a).

6A is a perspective view showing an outer appearance of a rear portion of a van type truck provided with a cavity, and FIG. 6B is a view showing a wind tunnel test smoke shading processing result of FIG. 6A.

FIG. 7A is a perspective view showing an outer appearance of a rear portion of an original vehicle (no countermeasure), and FIG. 7B is a view showing a wind tunnel test smoke shading processing result of FIG. 7A.

FIG. 8 is a schematic perspective view showing a mounting structure example of a fixed corner vane and a cavity when the back surface of the van is a double door fan.

FIG. 9 is a schematic perspective view showing a general mounting structure example of a fixed corner vane.

FIG. 10 is a schematic perspective view of a movable corner vane in which the corner vane slides and separates from the cavity.

FIG. 11 is a schematic perspective view of a movable corner vane in which the corner vane rotates and separates from the cavity.

FIG. 12 is a schematic perspective view of a movable corner vane that stores the inside of the cavity by rotating the corner vane,
(A) is a state where the corner vane is taken out, and (b) is a state where the corner vane is stored.

FIG. 13 is a diagram showing a first embodiment of a structure in which an opening provided in a cavity is opened and closed by a movable corner vane,
(A) shows a state in which the opening is closed, and (b) shows a state in which the opening is opened.

FIG. 14 is a diagram showing a second embodiment of a structure in which an opening provided in a cavity is opened and closed by a movable corner vane.

FIG. 15 is a view showing a third embodiment of a structure in which an opening provided in a cavity is opened and closed by a movable corner vane,
(A) shows a state in which the opening is closed, and (b) shows a state in which the opening is opened.

FIG. 16 is a schematic perspective view showing a movable double corner vane structure example.

FIG. 17 is a perspective view showing an original van truck.

FIG. 18 is a view showing a conventional measure, (a) shows an example in which a cavity is provided, and (b) shows an example in which a sagging rubber is attached.

FIG. 19 is a diagram showing a test result of mud adhesion, (a) shows an original shape (non-measure vehicle), (b) shows a case where a cavity is provided, and (c) shows a case where a sag rubber is attached. .

[Explanation of symbols]

 1 van 2 cavity 4 corner vane 4a upper vane 4b side vane

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[Procedure amendment]

[Submission date] December 7, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayuki Takeyama 5-717-1 Fukahori-cho, Nagasaki-shi, Nagasaki Sanryo Heavy Industries Ltd. Nagasaki Research Institute

Claims (1)

[Claims] 1. A back mud for a van type vehicle having a back mud adhesion amount reducing structure in which a substantially vertical wall surface is formed on the back surface, wherein a cavity and a corner vane are provided side by side around the wall surface. Adhesion amount reduction structure.