JPS6382820A - Roof deflector for automobile - Google Patents

Abstract

PURPOSE:To prevent the generation of air cut noise and expansion of hood, by a method wherein, in a canvass top car, the level of the central part in the direction of the width of a car of a roof deflector is lowered than that of each of both sides, and a sloped surface, inclined obliquely forward, is formed to each of the front parts of portions on both sides. CONSTITUTION:The level of a central part 6a in the direction of the width of a car of a deflector 6, situated to the upper edge of a front glass 5, is lowered in a stepped manner than that of each of sides 6b and 6b on both sides, and sloped surfaces 6c and 6c, inclined obliquely forward, are formed to the front parts of the two side parts 6b and 6b. This constitution causes a flow on the central part 6a of the deflector 6 to run near a hood and rapidly, and flows on both sides to jump up and run at a slow speed. Thus, a flow C, running from both sides toward the central part, is produced, a force, pressing downward the central part of the hood, is produced, and the negative pressure of the back part of the deflector 6 is reduced. Therefore, expansion of the hood and the generation of air cut noise can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a roof deflector for an automobile in which a roof panel is provided with an opening that is opened and closed by a cover member.

(Prior art) In recent years, automobiles with an opening in the roof panel have been put into practical use in order to improve the feeling of openness and exhilaration when driving and to enjoy a comfortable drive. Examples include those shown in US Pat. No. 3,658,378 and those shown in Japanese Utility Model Publication No. 58-35539. The former is called a canvas top vehicle, and as shown in Figure 8, an opening 2' provided in a roof panel 1' is opened and closed by a foldable hood 3'. This vehicle is called a non-roof vehicle, and as shown in FIG. 9, an opening 5' provided in a roof panel 4' is opened and closed by a sliding roof or a detachable roof (not shown).

By the way, in this type of automobile, when the vehicle is driven with the opening open, a vortex is generated when the wind flowing from the windshield along the roof panel separates from the roof panel at the leading edge of the opening. This has a problem in that it receives energy from the mainstream and flows into the vehicle interior while growing, and also rapidly releases energy within the vehicle interior, causing an unpleasant noise called so-called slob noise.

On the other hand, in the automobile disclosed in the above-mentioned Japanese Utility Model Publication No. 58-35539, as shown in FIG. -6' is provided, and the above-mentioned slob noise is reduced by using this deflector 6' to bounce the traveling wind upward and eliminate its influence from the opening 5' into the inside of the conductor.

(Problem to be Solved by the Invention) However, when attempting to effectively reduce the slob noise by using a deflector provided at the front edge of the opening of the roof panel as described above, it is difficult to move the deflector far above the roof panel. The deflector has to be protruded, so that additional wind noise is generated by the deflector.

In addition, as the wind is thrown upward by this deflector, a large negative pressure is generated at the back of the deflector. Therefore, especially in canvas top cars, when driving with the top closed, A problem arises in that the hood bulges upward. Furthermore, the vortex generated at the back of the deflector intermittently releases energy, which causes pressure fluctuations above the front of the top, causing the top to vibrate and produce the so-called flapping sound of the top.

The present invention addresses the above-mentioned actual situation in sunroof cars, canvas top cars, etc., and improves the shape of the deflector provided at the front edge of the opening in the roof panel, thereby reducing wind deflection by the deflector. In addition to reducing noise, the purpose is to suppress the bulge and flapping noise of the hood, especially in canvas-top vehicles.

(Means for Solving the Problems) That is, the present invention provides an automobile in which a roof panel is provided with an opening that is opened by a cover member. This relates to a roof deflector provided in which the central part of the deflector in the vehicle width direction is lower than the left and right side parts, and the front parts of the left and right sides are provided with inclined surfaces that slope diagonally upward toward the front. It is characterized by having been established.

(Function) According to the above configuration, of the main flow (driving wind) flowing rearward from the windshield over the deflector, the flow in the center in the vehicle width direction is reduced by lowering the deflector at the center. Therefore, there is little upward splash and the flow is relatively high. On the other hand, the flow on both sides of the deflector is thrown up relatively upward and collides with the inclined surfaces provided on both sides of the deflector, thereby weakening the flow velocity. Therefore, immediately behind the deflector, a low and fast flow occurs in the center in the vehicle width direction, and a relatively high and slow flow occurs on both sides. A new lateral flow flows from the center to the center, which presses the low-flowing main flow in the center further downward and weakens the negative pressure on the back of the deflector.As a result, especially on canvas tops, When the car is driven with the top closed, the expansion of the top is suppressed. In addition, the generation or growth of the vortex is hindered by the above-mentioned lateral flow, and the vibration of the hood and the accompanying flapping noise due to the intermittent energy release of the vortex are prevented, and the opening is kept open. When driving in
The above-mentioned lateral flow weakens the vortex that causes the slob noise, so a deflector that is overall short is sufficient, and as a result, the wind noise caused by the deflector is reduced. It turns out.

(Example) Examples of the present invention will be described below. Note that this embodiment relates to a canvas top vehicle.

As shown in FIG. 1, in the automobile according to this embodiment, a roof panel 2 forming the roof of a vehicle body 1 is provided with an opening 3 that covers almost the entire surface thereof, and the opening 3 can be opened and closed. A canopy 4 is provided. When opening the opening 3, the hood 4 is held in the state of being folded backwards as shown in the figure, and from this state, if the front end is pulled forward by an appropriate driving means (not shown), the hood 4 can be opened. Part 3
is now closed (see Figure 5).

On the other hand, a deflector 6 is provided at the front edge of the opening 3 in the roof panel 2 so as to be continuous with the upper edge of the windshield 5 and extend over substantially the entire area in the vehicle width direction. As shown in Figs. 2 to 4, this deflector 6 is constructed by using screw members 8...8 on brackets 7...7 fixed to the roof panel 2, so that the entire deflector 6 is tilted toward the rear. A protector rubber 9 is attached to the front edge of the roof panel 2, and the protector rubber 9 is attached to the front edge of the roof panel 2, and the rear side is open so that when the top 4 is closed, the front edge of the protector rubber 9 is inserted and stored. It has become so. The deflector 6 has a center portion 6a in the vehicle width direction and a left and right side portion 6a.
The front portions of both side portions 6b and 6b are provided with sloped surfaces 6c and 6c, respectively, which are lowered in a stepped manner than those of the side portions 6b and 6b, and which slope diagonally upward toward the front.

In FIGS. 3 and 4, reference numeral 10 is a frame attached around the opening 3, and reference numerals 11 and 12 are frames between the front end of the top 4 and the roof panel 2 when the top 4 is closed. This is a sealing member that seals the

According to the above configuration, as shown in FIG. 5, when driving with the top 4 closed and the opening 3 closed, water flows from above the windshield 5 over the deflector 6 to above the top 4. Of the main flow, the flow A in the center passes through the short center portion 6a of the deflector 6, so
Flows B and B on both sides flow at a low position close to the hood 4 and at a high flow velocity, while the flows B and B on both sides
Since the water collides with the inclined surfaces 6c, 6c provided on both sides 6b, 6b, the flow velocity becomes slow, and the water is thrown up relatively upward.

Therefore, above the front part of the top 4 in the open state, a low and fast flow occurs in the center in the vehicle width direction, and a relatively high and slow flow occurs on both sides. As a result, as shown in FIGS. 2 and 5, a lateral flow C9C flowing downward from both sides to the center is generated. This flow C1C presses the flow A in the center further downward and acts to weaken the negative pressure at the back of the deflector 6, and as a result, the expansion of the top 4 is suppressed.

In addition, a vortex D as shown in Fig. 3.4 is generated at the back of the deflector 6, but the growth of this vortex D is hindered by the above-mentioned lateral flow C1C, or the vortex D is will be disturbed.

Therefore, pressure fluctuations caused by large eddy currents and intermittently releasing energy are avoided, and generation of vibration or flapping noise of the hood 4 due to such pressure fluctuations is prevented.

Furthermore, the above-mentioned lateral flow C1C has the effect of hindering the growth of the vortex flow that flows into the vehicle interior and generates the slob noise when the opening 3 is opened, and disturbs the vortex.
Therefore, it becomes possible to avoid reducing the slob noise without raising the mainstream too far upward, and it becomes possible to reduce the stiffness of the deflector 6 of 196 to achieve the required reduction effect on the slob noise. Accordingly, the wind noise caused by the deflector 6 is reduced.

Incidentally, the opening when the top is closed when the deflector 6 according to the above embodiment is used and when the conventional deflector 6'' is simply provided with a stepped part 6a'' in the center as shown in FIG. An experiment was conducted to compare the noise levels at the center of the section, and the results will be explained below. In the case of the conventional deflector 6'', the wind flows only in the front and back direction, and the lateral flow C1C does not occur as in the deflector 6 of the embodiment. It is set so that the same reduction effect on slob noise can be obtained, and therefore the deflector 6 of the embodiment is shorter than the conventional deflector 6''.

The results of this experiment are as shown in Figure 7. Particularly when the vehicle was traveling at speeds of 60 and 100 M/b, the noise in the low frequency range (the flapping sound of the hood) was shown by the solid diagonal lines.
is effectively reduced, and the running speed is reduced to 60.100,1
In all cases of 40.160 KR/h, it was confirmed that the noise in the high frequency range (wind noise from the deflector) was effectively reduced as shown by the dotted line.

(Effects of the Invention) As described above, according to the present invention, in canvas top vehicles, sunroof vehicles, etc., in which the opening provided in the roof panel is opened and closed by a cover member, the roof panel is closed in order to prevent slob noise. Deflector on the front edge of the opening
When a deflector is provided, the height of the deflector can be made low, and wind noise caused by the deflector can be reduced. In addition, especially in canvas top vehicles, the negative pressure at the back of the deflector is weakened and the main flow flowing through the center of the hood is suppressed, suppressing the expansion of the hood and reducing the vortex flow at the back of the deflector. Since the generation or growth is prevented, vibrations and flapping sounds of the hood caused by the intermittently emitting energy of the eddies are prevented. As a result, noise in this type of vehicle is reduced, and in canvas top vehicles, deterioration in appearance due to bulging of the top is prevented.

[Brief explanation of the drawing]

Figures 1 to 5 show embodiments of the present invention. Figure 1 is a perspective view showing the roof area of a canvas top vehicle, Figure 2 is a front view of the deflector, and Figures 3 and 4 are Figure 2■
FIG. 5 is an enlarged cross-sectional view of the deflector taken along lines -■ and IV-IV, respectively, and is an explanatory view showing the flow of wind when the top is closed. In addition, Fig. 6 is an explanatory diagram showing the flow of running wind when a conventional type deflector is used, and Fig. 7 is an explanatory diagram showing the effect of this embodiment compared to the case where the deflector shown in Fig. 6 is used. This is a level graph. Furthermore, FIGS. 8-9 are schematic perspective views showing the general constructions of a conventional canvas top vehicle and a conventional sunroof vehicle, respectively. 2... Roof panel, 3... Opening, 4... Cover member (hood), 6... Deflector-16a... Center part, 6b... Side part, 6C... Slanted surface . Fig. 3 Fig. 4 m5 Fig. 6 Fig. $7 Fig. 3 FL (Hz) Fig. 8 Fig. 9 Fig. 4'

Claims (1)

[Claims] (1) A roof deflector provided along the front edge of the opening of the roof panel of an automobile in which an opening is formed in the roof panel and a cover member for opening and closing the opening is provided, the roof deflector being provided at the center in the width direction of the vehicle. What is claimed is: 1. A roof deflector for an automobile, characterized in that the roof deflector is lower than the left and right sides, and the front parts of the left and right sides are provided with inclined surfaces that slope diagonally upward toward the front.