JP3903946B2 - Rearview mirror device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rearview mirror device.
[0002]
[Prior art]
A motorcycle is provided with a rearview mirror device for obtaining a rear view. 7A, 7B, and 7C show the longitudinal cross-sectional shape of a general rearview mirror device.
[0003]
As shown in FIGS. 7A, 7 </ b> B, and 7 </ b> C, the rearview mirror device 1 includes a mirror body 2 and an integrally formed housing 3 that houses the mirror body 2. Since the rearview mirror device 1 is disposed at a position lower than the eyes of the lidar, the mirror body 2 is disposed so as to fall forward from a vertical plane with respect to the ground, thereby ensuring a rear view including the ground.
[0004]
The shape of the housing 3 is, for example, as shown in FIG. 7 (a), in which the apex 5 of the housing 3 is placed in front of a center line 4 extending at right angles from the center of the mirror surface of the mirror body 2, and is substantially vertically symmetrical. Is common. In this case, since the mirror main body 2 is disposed so as to be tilted forward, the vertex 5 of the housing 3 is inevitably below the horizontal line 6 extending parallel to the ground from the center of the mirror surface of the mirror main body 2.
[0005]
Further, as shown in FIG. 7B, the apex 5 of the housing 3 is placed below the center line 4 extending at a right angle from the center of the mirror surface of the mirror body 2, or as shown in FIG. 7C. In some cases, the vertex 5 of the housing 3 is placed above a horizontal line 6 extending horizontally from the center of the mirror surface of the mirror body 2.
[0006]
[Problems to be solved by the invention]
However, the traveling wind that flows toward the rear during traveling of the motorcycle is placed below the line extending horizontally from the center of the mirror surface of the mirror body as in the housing shown in FIG. Since the upper surface of the housing is inclined, a vortex is generated around the rear-view mirror device as shown in FIG. 8 (a), and this vortex grows to generate a negative pressure obliquely upward and generate lift. At the same time, since the generated vortex does not converge, the drag becomes large, so it cannot be said that the aerodynamic characteristics are preferable.
[0007]
Further, as shown in FIG. 7B, as the apex of the housing moves downward, the aerodynamic characteristics are remarkably deteriorated as shown in FIG. 8B.
[0008]
On the other hand, when the top of the housing is placed above a line extending horizontally from the center of the mirror surface of the mirror body as shown in FIG. 7C, vortex growth is relatively suppressed as shown in FIG. 8C. At the same time, the negative pressure in the diagonally rearward and lower direction is also reduced, and the upward pressure that the housing basically receives wins and generates lift, which is not a preferable aerodynamic characteristic.
[0009]
Further, when the housing is integrally formed, the length (l) of the rectifying surface extending rearward from the maximum height (h) of the housing cannot be extended so long due to the die-cutting relationship. The rectification at the rear of the height (h) is incomplete, generating vortices and increasing the air resistance (see FIG. 8A).
[0010]
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a rearview mirror device that improves aerodynamic characteristics.
[0011]
[Means for Solving the Problems]
In order to solve the above-described problem, a rearview mirror device according to the present invention is provided with a pair of left and right sides of a vehicle body as described in claim 1 and includes a mirror body and a housing for housing the mirror body. In the rearview mirror device to be provided, the housing is formed by a front housing on the front side of the maximum height portion of the housing and a rear housing on the rear side of the maximum height portion of the housing , and a vertex serving as a front end of the front housing is formed. The front housing is formed near the front on a horizontal line passing through the mirror surface center of the mirror body, and the front housing is formed in a curved surface shape having a substantially symmetrical curvature with respect to the horizontal line, while the lower rectifying surface of the housing is on the upper side together extend rearwardly to be longer than the regulating surfaces, the Mi toward the rear from the maximum height portion of the housing -The length L from the rear end of the rear housing to the position where the rear housing is connected to the front housing is defined as the maximum height of the housing from the rear end of the rear housing. The rear housing and the front housing are connected within the range of the length L that is longer than the length up to the maximum height, and the maximum height of the housing within the range of the length L. The rear housing of the front part is curved so as to follow the curved shape of the front housing, and is inward of the rear end of the rear housing where the rectifying surface extends behind the constricted opening and behind the maximum height part. The mirror body is disposed at a position with the mirror body slightly submerged.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0014]
FIG. 1 is a front view showing an example of a motorcycle to which the present invention is applied.
[0015]
As shown in FIG. 1, the front portion of the motorcycle 11 is covered with a streamlined cowling 12 so as to reduce air resistance during traveling and protect the rider from traveling wind pressure.
[0016]
The upper part of the cowling 12 is a shield screen 13, and a pair of left and right rearview mirror devices 14 are provided on both sides thereof. Further, the rearview mirror device 14 is disposed at a position lower than the eyes of the lidar (not shown).
[0017]
FIG. 2 is a longitudinal sectional view of the rearview mirror device 14 taken along the line II-II in FIG. 1 and shows a first embodiment thereof. As shown in FIG. 2, the rearview mirror device 14 includes a mirror main body 15 and a housing 16 that houses the mirror main body 15, and the housing 16 is integrally formed of synthetic resin or the like. Further, the mirror body 15 is disposed so as to fall forward from a vertical plane with respect to the ground, and ensures a rear view including the ground.
[0018]
The shape of the housing 16 is such that the apex 18 of the housing 16 is placed in front of a horizontal line 17 extending in parallel with the ground from the center of the mirror surface of the mirror body 15, and is formed in a shape that is substantially symmetrical with respect to the horizontal line 17. Then, the mirror main body 15 is fitted in the opening 19 on the opposite side of the apex 18 of the housing 16 while being slightly submerged in the housing 16.
[0019]
FIG. 3 shows a second embodiment of the rearview mirror device 14 shown in FIG. As shown in FIG. 3, in the housing 21 of the rearview mirror device 20, of the outer edge of the opening 22, only the lower part of the outer edge that protrudes rearward of the mirror surface of the mirror body 23 extends rearward, and the extension 24 Is formed.
[0020]
FIG. 4 shows a third embodiment of the rearview mirror device 14 shown in FIG. As shown in FIG. 4, the housing 26 of the rearview mirror device 25 is formed in a front housing body 27 and a rear cap portion 28 so as to be divided into two in the front-rear direction.
[0021]
The housing main body 27 and the cap portion 28 are divided at the maximum height (H) portion of the housing, and the cap portion 28 extends rearward and is formed in a shape that is narrowed toward the center toward the rear. Is done. Then, the mirror main body 30 is fitted in the narrowed opening 29 in a state where it is slightly submerged in the cap portion 28.
[0022]
Next, the operation of this embodiment will be described.
[0023]
By forming the housing 26 of the rearview mirror device 25 so as to be split into two in the front-rear direction, a rectifying surface extending rearward from the maximum height (H) of the housing can be formed in the cap portion 28. As a result, the length (L) of the rectifying surface can be extended, and a static vortex is generated around the mirror surface of the mirror body 30 as shown in FIG. The generation of the static vortex provides a shape effect as if the rectifying surface is extended rearward, and the rectifying effect, that is, the aerodynamic characteristic is improved.
[0024]
Further, the apex 18 of the housing 16 is placed in front of a horizontal line 17 extending in parallel with the ground from the center of the mirror surface of the mirror main body 15, and the housing 16 is formed in a shape substantially symmetrical with respect to the horizontal line 17 as shown in FIG. As shown, the distance from the apex 18 of the housing 16 to the mirror surface end of the mirror body 15 is longer on the lower side than on the upper side. That is, the lower half of the housing 16 has more rectifying surfaces than the upper half.
[0025]
As a result, when the motorcycle 11 travels, separation occurs early in the air flow on the upper side of the housing 16, and the flow velocity of air flowing on the lower side becomes relatively faster than that on the upper side. As a result, the vortex generated on the upper side is not pulled by the downstream flow and grows greatly. Accordingly, the drag force is reduced and the pressure received by the housing 16 is basically substantially equal in the vertical direction. However, as described above, there is a difference in the vertical flow velocity, and the lower side becomes negative pressure and downforce (negative Lift).
[0026]
Furthermore, if only the lower part of the outer edge that protrudes rearward of the mirror surface 23 of the mirror body 23 out of the outer edge of the opening 22 of the housing 21 is extended rearward to form the extended portion 24 of the more rectifying surface, the above effect is obtained. When the extension portion 24 is applied to the conventional rearview mirror device 1, the same effect can be obtained. In the above-described embodiment, the rear-view mirror device 1 is shown in which the mirror body 23 is fixed to the housing 21. Needless to say, the present invention is applicable.
[0027]
【The invention's effect】
As described above, according to the rearview mirror device according to the present invention, a stationary vortex is generated and the aerodynamic characteristics of the rearview mirror device are improved. Further, the drag is reduced and downforce is generated, so that the aerodynamic characteristics of the rearview mirror device can be improved. Further, drag reduction and downforce generation are promoted, and the aerodynamic characteristics of the rearview mirror device are improved.
[Brief description of the drawings]
FIG. 1 is a front view of a motorcycle showing an embodiment of a rearview mirror device according to the present invention.
FIG. 2 is a longitudinal sectional view of the rearview mirror device taken along the line II-II in FIG.
FIG. 3 is a diagram showing a second embodiment of the rearview mirror device shown in FIG.
FIG. 4 is a diagram showing a third embodiment of the rearview mirror device shown in FIG.
FIG. 5 is a view showing a state of air flowing around the rearview mirror device shown in FIG. 4;
6 is a view showing a state of air flowing around the rearview mirror device shown in FIG. 2. FIG.
FIGS. 7A, 7B and 7C are longitudinal sectional views showing the shape of a conventional rearview mirror device, respectively.
FIGS. 8A, 8B, and 8C are views showing the state of air flowing around the conventional rearview mirror device shown in FIGS. 7A, 7B, and 7C. FIGS.
[Explanation of symbols]
11 Motorcycle 14, 20, 25 Rearview mirror device 15, 23, 30 Mirror main body 16, 21, 26 Housing 17 Horizontal line 18 extending parallel to the ground from the mirror surface center of mirror main body Apex 19, 22, 29 of housing 24 Opening 24 Protruding part 27 Housing body 28 Cap part

Claims (1)

In a rearview mirror device that is provided in a pair of left and right sides on the both sides of a vehicle body and includes a mirror body and a housing that houses the mirror body, the housing includes a front housing that is in front of a maximum height portion of the housing, and a maximum of the housing. It is formed by the rear housing on the rear side from the height part, and the apex that becomes the front end of the front housing is set near the front on the horizontal line passing through the mirror surface center of the mirror body, and the front housing is substantially vertically symmetrical with respect to the horizontal line The rear housing is extended rearward so that the lower rectifying surface of the housing is longer than the upper rectifying surface, and the rear housing is moved rearward from the maximum height portion of the housing. Forms a rectifying surface that is narrowed toward the center of the mirror surface of the mirror body, and from the rear end of the rear housing to the front The length L to the position where it is connected to the housing is longer than the length from the rear end of the rear housing to the maximum height of the housing, and the rear side in the range of the length L that is longer than the length to the maximum height. In addition to connecting the housing and the front housing, the rear housing of the front portion of the length L within the range of the maximum height of the housing is curved so as to follow the curved shape of the front housing, and the rear housing is narrowed. A rearview mirror device characterized in that the mirror body is disposed in a slightly indented position at an inward position from a rear end of a rectifying surface extending behind the maximum height portion in the opening.

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