JPS6390433A - Deflector for automobile sun roof - Google Patents

Abstract

PURPOSE:To prevent window slop with no wind hurtling sound, by attaching a traverse rod-like section along the leading edge of the opening of a sun roof so that the rod-like section is projected upward from the upper surface of the roof by means of a support column, and by forming a through-channel in parallel with the line normal to the upper surface of the roof, in the intermediate part of the rod-like section. CONSTITUTION:A rod-like member 18 is attached transversely of a vehicle body along the leading edge of the opening 12 of a sun roof 14 so that the rod-like member 18 is projected upward from the upper surface of the roof 14 by means of a support column, and a vertical through-channel 16 parallel to the line 14A normal to the upper surface of the roof 14 is formed in the longitudinally intermediate part of the rod-like member 18, thereby to constitute a sun roof deflector. A vortex street generated along the leading edge of the sun roof opening is made to interfere with the frequency of the Karman's vortex street generated by the deflector so as to prevent wind slop resonance. In particular, the level of variation in the flow of air is increased by means of the through-channel 16 thereby to effectively prevent the wind slop phenomenon without the degree of projection of the deflector from the upper surface of the roof being made to be large.

Description

[Detailed description of the invention] [Industrial application field]

This invention relates to improvements in deflector devices for automobile sunroofs.

[Conventional technology]

A sliding roof has a sunroof opening formed in the roof above the passenger seat, which slides in the longitudinal direction of the vehicle.
Alternatively, there are so-called sunroof type automobiles that have a detachable roof that can be opened and closed. In such automobiles, while driving with the sunroof open, a pulsating noise called wind throb may be generated within the vehicle interior, making the occupants uncomfortable. This is because when the car is running, airflow is drawn into the cabin along the front edge of the sunroof opening, generating a regular vortex train called an edge tone, and this vortex train grows and moves rearward. The cause is that the air collides with the rear edge of the sunroof opening or flows into the vehicle interior, causing the air in the vehicle interior to resonate and generate unpleasant pulsating noise. In order to prevent this windslop phenomenon, conventionally,
Some have a deflector installed along the front edge of the sunroof opening. This deflector is usually a strip-shaped plate body long in the width direction of the vehicle body, and its upper end projects diagonally rearward from the top surface of the roof. Such a deflector prevents wind from being drawn in along the front edge of the sunroof opening while the vehicle is running. That is, the airflow flowing along the front windshield glass and the front end of the roof is blown upward by the deflector to prevent the formation of a vortex line along the front edge of the sunroof opening. The larger the deflector as described above protrudes from the top of the roof, the greater the effect of preventing wind throttling, but the larger the deflector protrudes, the larger the device becomes.
Problems arise in that a large wind noise is generated when the vehicle is running at high speed, and air resistance is increased when the vehicle is running at high speed. Therefore, in the past, the amount of protrusion of the deflector could not be increased, and therefore the effect of preventing wind throttling was small. On the other hand, as disclosed in, for example, Japanese Utility Model Application Publication No. 56-111016, in the above-mentioned deflector,
An air passage is formed from the front surface of the deflector toward the tip (upper end) of the deflector, and while the vehicle is running, air flows through the air passage and blows out from the tip of the deflector, forming a vortex along the tip of the deflector. Some devices disturb the main air flow to prevent the generation of vortices.

[Problems to be solved by the invention]

However, the deflector disclosed in Japanese Utility Model Application Publication No. 56-111016 does not have a sufficient effect of preventing the generation of eddy currents, and since the structure is such that the air is blown out from the tip of the deflector, noise is generated when the air is blown out. There is a problem with this occurring.

[Purpose of the invention]

This invention was made in view of the above-mentioned conventional problems, and it is possible to effectively reduce the amount of windshield without increasing the amount of protrusion of the deflector from the top surface of the roof and without generating noise. It is an object of the present invention to provide a deflector device for an automobile sunroof that can suppress the occurrence of a bump phenomenon.

[Means to solve the problem]

The present invention provides a rod-shaped member disposed along the front edge of a sunroof opening in an automobile so as to protrude upward from the top surface of the roof, the rod-shaped member having a normal line to the top surface of the roof in the vicinity of the front edge at a central position in the front-rear direction. The above object is achieved by providing a deflector in which substantially parallel vertical through grooves are biased. Further, the outer diameter of the deflector in the normal direction is S

[ is the Strouhal number, ■ is the vehicle speed when no deflector is attached to the sunroof opening and the wind slot formed by the leading edge is at its maximum, and f is the velocity generated by the Karman vortex street formed by the deflector. When the forced vibration frequency of indoor air is determined by D=St·V/f, the above objective is achieved. Further, the above object is achieved by making the gap H between the deflector and the roof upper surface substantially equal to the above. Furthermore, the angle θ・ between the through groove and the normal line,
The above objective is achieved by setting θ≦15°. [Operation] In this invention, since the deflector is formed with a through groove parallel to the normal line of the roof, the energy of the Karman vortex street formed by the deflector is large, and the vortex formed by the leading edge of the sunroof opening is It interferes with the row and suppresses the occurrence of wind throttling.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 3, this embodiment is a rod-shaped member disposed along the front edge 12A of the sunroof opening 12 in the automobile 10, protruding upward from the upper surface of the roof 14, A normal line 14A to the upper surface of the roof 14 in the vicinity of the front edge 12A is located at the center position in the front-rear direction.
A deflector 18 is provided with a vertical penetration Wk16 substantially parallel to the vertical direction. The deflector 18 has a cross-sectional shape of a pair of semicircles facing each other with the through groove 16 in between. This rod-shaped deflector 18 has pillars 20 at both ends thereof.
It is attached to the lower side near the front edge 12A of the sunroof opening 12 so that it can be raised and lowered. In the figure, reference numeral 22 indicates a sliding sunroof, and 24 indicates a front windshield glass. Here, the outer diameter of the deflector 18 in the direction 4A is defined by St being the Strouhal number, and ■ being the wind slot formed by the front edge 12A when the deflector 18 is not attached to the sunroof opening 12. When the vehicle speed is the maximum and the forced vibration frequency of the indoor air generated by the Karman vortex street formed by the deflector 18 is determined by D=St - V/f. , the Strouhal number St is usually about 0.2. Also, the gap ゛H between the deflector 18 and the roof 14 is
It is set approximately equal to the above. Further, the width of the penetration ff116 in the deflector 18 needs to be determined experimentally since the minimum value differs for each vehicle, but it was effective to set it to approximately 1011 mm. The deflector 18 having the above structure generates a Karman vortex street behind it while the automobile 10 is running. On the other hand, along the front edge 12A of the sunroof opening 12, a vortex train that causes wind slob is also generated. Therefore, if the frequency of the Karman vortex street generated by the deflector 18 is appropriately selected relative to the frequency of the vortex street generated by the leading edge 12A, the two will interfere, and the windthrob resonance phenomenon will be destroyed by this interference. That will happen. Particularly in this embodiment, the deflector 18 has a through groove 1.
6 is formed, and this through groove 16 is formed substantially parallel to the normal line 14A of the roof 14, the fluctuation of the airflow occurring around the deflector 18 becomes extremely large, and therefore the deflector 18 is formed. The energy of the Karman vortex street also increases. Therefore, the vortex breaking effect of the wind slot due to the Karman vortex street formed by the deflector 18 increases, and as a result, the resonance of the cabin air due to the wind slot is suppressed. Here, if the deflector 18 is not provided, if a conventional plate type deflector or a holed plate type deflector is provided, or if a cylindrical deflector without a through groove is provided, the penetration IR 16 in the above embodiment The occurrence of wind slobs when the width is 511 mm and 10 mm is shown in Table 1 below, and the effects of the present invention have been confirmed through experiments.
Although the gap H between the deflector 18 and the roof 14 was made almost equal to the distance D of the deflector 18, according to the inventor's experiments, H≧Oi
m, the effect of preventing wind throttling was confirmed. Furthermore, in the embodiment described above, the through groove 16 is parallel to the normal 14A of the roof 14, that is, perpendicular to the air flow around the deflector 18;
This is because the level of fluctuation in air flow in the surrounding area is maximized. However, according to experiments, as shown in FIG. 4, if the angle θ between the through groove 16 and the normal line 14A is within ±151, the effect of preventing wind throttling was confirmed. Furthermore, in the above embodiment, the deflector 18 has a structure in which the cylindrical member is not divided into two by the through groove 16.
The shape of the deflector in the present invention is not limited to this, but may be as in the second to fifth embodiments shown in FIGS. 5 to 8. That is, in the second embodiment, in the cross section of the deflector 26, the front half 26A has a triangular shape, and the rear half 26B has a semicircular shape. Moreover, the deflector 2 in the third embodiment shown in FIG.
8, the first half 28A has a triangular shape, the second half 28B has a square shape, and the deflector 30 in the fourth embodiment shown in FIG. The deflector 32 in the fifth embodiment shown in the figure has a front half 32A in a semicircular shape and a rear half 32B in a square shape. It should be noted that, as shown in the first embodiment, when the cross-sectional shape of the deflector 18 is a pair of semicircles, the effect of generating the Karman vortex street is greatest. In the above embodiment, both ends of the deflector 18 are supported by the support columns 2o, and the through grooves 16 are formed over the entire width range of the deflector 18, but the present invention is not limited to this. The struts 20 may be provided at appropriate intervals η in the vehicle width direction of the deflector, and the through grooves may be provided intermittently in the vehicle body width direction of the deflector.

【Effect of the invention】

Since the present invention is configured as described above, the protrusion of the deflector can be increased to a large extent, and the present invention has the excellent effect of suppressing the occurrence of wind slob without causing wind noise.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of a deflector device for an automobile sunroof according to the present invention, FIG. 2 is an enlarged perspective view showing the deflector of the same embodiment, and FIG. −
■A schematic enlarged sectional view along the line; FIG. 4 is a sectional view showing the relationship between the through groove and the normal line of the roof in the same embodiment; FIGS. 5 to 8 are views showing second to fifth embodiments of the present invention. It is a sectional view showing the structure of the deflector in an example. DESCRIPTION OF SYMBOLS 10... Automobile, 12... Sunroof opening, 12A... Front edge, 14... Roof, 14A... Normal line, 16... Penetration groove, 18.26.28.30.32. ...Deflector.

Claims (4)

[Claims] (1) Along the front edge of the sunroof opening in a car,
A deflector, which is a rod-shaped member disposed to protrude upward from the roof top surface, is provided at a central position in the longitudinal direction thereof, and has a vertical through groove that is substantially parallel to the normal to the roof top surface in the vicinity of the front edge. A deflector device for automobile sunroofs. (2) The outer diameter D of the deflector in the normal direction is St
is the Strouhal number, V is the vehicle speed when no deflector is attached to the sunroof opening and the wind slot formed by the leading edge is at its maximum, and f is generated by the Karman vortex street formed by the deflector. The deflector device for an automobile sunroof according to claim 1, wherein the forced vibration frequency of indoor air is determined by D=St·V/f. (3) The deflector device for an automobile sunroof according to claim 1, wherein a gap H between the deflector and the upper surface of the roof is made substantially equal to the gap D. (4) The angle θ between the through groove and the normal line is θ≦1
A deflector device for an automobile sunroof according to claim 1, 2, or 3, wherein the angle is 5°.