JPH0439138A - Headlamp device for motorcycle - Google Patents

Abstract

PURPOSE:To arrange projector lamps near a steering shaft to the utmost by arranging center lines of reflecting mirrors of the right and left projector lamps slantly in the right and left directions of a vehicle body against center lines of lenses, and making the inclination directions opposite to each other on the right and left. CONSTITUTION:A reflecting mirror 17 has the first and second focal points f1, f2 on the optical axis L, the filament 20 of a halogen lamp 19 is located at the first focal point f1, and the focal point f3 of a convex lens 21 coincides with the second focal point f2. The lens center line A1 connecting the center of the convex lens 21 and the second focal point f2 is arranged along the longitudinal direction of a vehicle body, the lens center line A1 is made parallel with the center line X1-X1 of the vehicle body, center lines A2 of reflecting mirrors of the right and left projector lamps 15 are inclined nearer to the center line X1-X1 of the vehicle body toward the rear from the second focal point f2, and the inclination directions are made opposite to each other for the right and left projector lamps 15. The interference between a front fork 3 and the reflecting mirrors 17 can be avoided, and the projector lamps 15 themselves can be arranged near a steering head pipe 2 to the utmost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a headlamp device for a motorcycle, and particularly to a structure in which a pair of projector lamps are arranged side by side in front of a front fork of the headlamp device.

[Prior Art] Conventionally, road sports type motorcycles have been known to have a cowling covering the area from the top of the front fork to the area around the engine, and a pair of headlamps arranged side by side on the front of the cowling. There is.

This conventional headlamp uses a so-called parabolic mirror, which has a parabolic cross section, as its reflector, so the diameter of this reflector is inevitably large, and the presence of this headlamp causes the front shape of the cowling to change. was subject to restrictions.

For this reason, recently, motorcycles have been known that employ so-called projector lamps having reflectors with an elliptical cross section in place of the conventional headlamps. This projector lamp has a halogen bulb placed at the first focus of a reflecting mirror with an open front end and an elliptical cross section.
A convex lens is arranged in front of the reflector so that the focus coincides with a second focal point where the light reflected by the reflector gathers, and the light from the halogen bulb is projected forward through the convex lens. There is.

In a projector lamp having such a configuration, the reflecting mirror has an elliptical cross section, so the focal length is short, and the reflecting mirror can be used at a deep angle. Therefore, even if the diameter of the reflector is small, much of the light from the 10-gen light bulb can be guided to the convex lens side. It has the advantage that it can be tilted strongly.

[Problems to be Solved by the Invention] However, since this projector lamp has two focal points on the optical axis of the reflecting mirror, the total length from the convex lens to the reflecting mirror becomes long. For this reason, when a pair of projector lamps are arranged side by side on the front of the cowling, their reflecting mirrors may be located exactly on the rotation locus of the front fork, and interference with the front fork becomes a problem.

Therefore, in order to avoid interference between the projector lamp and the front fork, the projector lamp must be placed in a position that protrudes far forward than the front fork. For this reason, in a motorcycle equipped with a cowling, the front surface of the cowling must also protrude forward to a large extent in accordance with the protrusion of the projector lamp, which results in greater restrictions on the design of the cowling.

Furthermore, in the case of a motorcycle without a cowling, the lamp itself stands out in an unusual way, which poses a problem in terms of appearance.

The present invention was made based on these circumstances, and
To provide a motorcycle in which interference between a front fork and a projector lamp can be prevented and the projector lamp can be placed as close to a steering shaft as possible.

[Means for Solving the Problem] Therefore, in the present invention, a front fork having a pair of left and right fork tubes, the upper parts of these fork tubes are connected by a pair of upper and lower brackets, and a front fork constructed between the brackets of this front fork. and a steering shaft rotatably supporting the front fork to a steering head pipe at the front end of the vehicle body, and a pair of headlamps arranged side by side in front of the steering head pipe, and the headlamp includes: It has a reflecting mirror with an elliptical cross section with an open front end, a light source is placed at a first focal point inside this reflecting mirror, and a convex lens is placed in front of a second focal point where the light reflected by the reflecting mirror gathers. These left and right projector lamps are arranged parallel to each other along the longitudinal direction of the vehicle body, with the lens center line connecting the center of the convex lens and the second focal point parallel to each other, and the first focal point of the reflecting mirror The center line of the reflector connecting the lens center line and the second focal point is arranged to be inclined in the left-right direction of the vehicle body with respect to the lens center line, and the direction of inclination of the reflector center line is opposite to that of the left and right projector lamps. It is characterized by

[Function] According to this configuration, since the reflector center line is inclined in the left-right direction of the vehicle body, the ends of the left and right projector lamps on the reflector side are bent in opposite directions toward the left-right direction of the vehicle body. It becomes a shape. Therefore, the reflecting mirrors are shifted away from the left and right fork tubes of the front fork, and the projector lamp itself can be moved closer to the steering shaft.

[Embodiment] A first embodiment of the present invention will be described below based on FIGS. 1 to 3.

FIG. 2 shows a motorcycle equipped with a projector lamp, and reference numeral 1 in the figure is a frame constituting the vehicle body. A telescopic fork 3 is pivotally supported on a steering vibration 2 located at the front end of the frame 1.

The front fork 3 has a pair of left and right fork tubes 4.
It is equipped with The fork tube 4 is composed of an inner tube 5a and an outer tube 5b that is slidably attached to the lower part of the inner tube 5a in the axial direction, and the upper parts of the pair of left and right inner tubes 5a are
They are connected via upper and lower brackets 6. and,
A steering shaft 7 is installed between these brackets 6, and this steering shaft 7 passes through the steering head vibe 2.

For this reason, the front fork 3 is rotatably supported by the steering head vibration 2 via the steering shaft 7, and the inner tubes 5b are positioned on both left and right sides of the steering head vibration 2.

Note that a front wheel 8 is supported at the lower end of the fork tube 4.

The area from the front of the steering head vibe 2 to the area around the engine 9 is covered by a cowling 10.

A light projection opening 11 is formed on the front surface of the cowling 10, and this opening 11 is formed with a transparent front lens lla.
covered by. Inside the opening 11, a pair of headlamps 12 are installed at the center line X, - in the longitudinal direction of the vehicle body.
They are arranged side by side with X in between. This headlamp 12 includes a projector lamp 15 according to the present invention.
is used, and this projector lamp 15 will be described below.
The details will be explained with reference to FIG.

That is, the projector lamp 15 includes a lamp body 16 having a cylindrical shape. The lamp body 16 includes a reflecting mirror 17 having an open front end and an oval cross section, and this reflecting mirror 17.
A cylindrical lamp body 18 is connected to the front end opening of the lamp body.

This lamp body 16 is arranged horizontally along the front-rear direction between the left and right inner tubes 5a of the front fork 3, and in the case of this embodiment, the frame 1
Or it is fixed to the cowling 10.

Although the reflecting mirror 17 has an elliptical vertical cross section, the overall shape is not a simple rotation of this ellipse, but a compound ellipse in which the elliptical cross section is gradually changed in the horizontal direction. I am doing it.

The reflecting mirror 17 has two focal points, first and second, f, f2 on one optical axis passing through its center. The first focal point f1 is located inside the reflecting mirror 17, and the second focal point f2 is located inside the lamp body 18 outside the reflecting mirror 17.

At the rear end of the reflecting mirror 17, a non-gen light bulb 19 is attached as a light source, and the filament 20 of the non-gen light bulb 19 is located at the first focal point f1.

A convex lens 21 is attached to the front end opening of the lamp body 18. In this embodiment, the focal point f of this convex lens 21 coincides with the second focal point f2 at which the light reflected by the reflecting mirror 17 gathers, and the convex lens 21 directs the light that gathers at the second focal point f2 forward. It is configured to project.

By the way, in the projector lamp 15 having such a configuration, the lens center line A1 connecting the center of the convex lens 21 and the second focal point f2 is arranged along the front-rear direction of the vehicle body. Line A is parallel to the center line X, -X of the vehicle body. On the other hand, the reflector center line A2, which connects the first focus f and the second focus f of the reflector 17 and is coaxial with the optical axis, is located on the left and right sides of the vehicle body with respect to the lens center line A. The reflecting mirror center line A2 and the lens center line A intersect at the second focal point f2.

In this embodiment, the left and right projector lamps 1
The reflector center line A2 of No. 5 becomes the center line X of the vehicle body as it goes backward from the second focal point f2.

xl, and the directions of inclination of the reflecting mirror center line A2 are opposite to each other between the left and right projector lamps 15.

Therefore, due to the inclination of the reflector center line A2, the lamp body 16 has a shape in which the reflectors 17 connected to the rear end thereof are bent in a direction in which they approach each other. It has entered between the inner tube 5a.

Further, the lamp body 18 of each projector lamp 15 is located on the rotation trajectory P of the inner tube 5a. For this reason, a notch 22 into which the inner tube 5a is inserted is formed in a portion of the lamp body 18 facing the side of the vehicle body.

Note that even if the inner tube 5a enters the notch 22, the principal light beam that is directed toward the convex lens 21 after being reflected by the reflecting mirror 17 is not blocked.

According to the first embodiment having such a configuration, the reflector center line A2 of each projector lamp 15 is changed from the second focal point f2 to the lens center line A of the convex lens 17 toward the vehicle body center line X, Since the lamp bodies 16 of the left and right projector lamps 15 are tilted in a direction approaching -X, the lamp bodies 16 of the left and right projector lamps 15 have a shape in which the reflecting mirrors 17 at their rear ends are bent in a direction in which they approach each other.

Therefore, the reflector 17 is located at the center of the vehicle body 11
+, the rotational trajectory P of the inner tube 5a
These front forks 3 and reflector 17 can be removed.
can avoid interference with the projector lamp 15
It can be placed as close as possible to the steering head vibe 2.

Therefore, the amount of forward protrusion of the projector lamp 15 can be suppressed to a small extent, the front surface of the cowling 10 can be prevented from protruding forward, and the cowling 10 itself can be formed compactly, thereby improving the design of the cowling 10. The degree of freedom above increases.

Moreover, in this embodiment, since the lamp body 18 is provided with a notch 22 into which the inner tube 5a enters,
The rotation angle of the front fork 3 can be increased by the depth of this notch 22, and even though the lamp body 18 is located on the rotation trajectory P of the inner tube 5a,
A sufficient rotation angle of the front fork 3 can be secured.

Note that the present invention is not limited to the first embodiment described above, and a second embodiment of the present invention is shown in FIG.

The second embodiment differs from the first embodiment in that the reflector 17 of the projector lamp 15 is placed further forward than between the inner tubes 5a of the front fork 3. The configuration is the same as that of the first embodiment.

In this configuration as well, since the reflector 17 is inclined in a direction approaching the vehicle body center 11AX+-Xr as it moves backward, the reflector center line A2 is coaxial with the lens center line A. The portion of the mirror 17 facing the side of the vehicle body is the center line X, -X of the vehicle body.

It will go into the side.

Therefore, assuming that the rotation angle of the front fork 3 is the same as when the reflector center line A2 is coaxial with the lens center line A1, the lamp body 16 can be shifted toward the steering head vibe 2 side. The amount of forward protrusion of the projector lamp 15 can be kept small.

Further, FIG. 5 discloses a third embodiment of the present invention.

In this third embodiment, the left and right projector lamps 15 are
They are arranged in front of the inner tube 5a of the front fork 3, respectively, and the first focal point f of the reflecting mirror 17,
The reflecting mirror center line A2 connecting the second focal point f2 and the second focal point f2 is inclined in a direction that moves away from the vehicle body center line X, -X as it goes rearward from the second focal point f2.

Therefore, due to the inclination of the reflector center line A2, the lamp body 18 is bent outward in the width direction of the vehicle body at its intermediate portion, and the inner tube 5a of the front fork 4 rotates inside this reflector m17. It is designed to move.

According to this third embodiment, as the reflecting mirror 17 moves backward, it is inclined in a direction away from the vehicle body center line X, -X, so that the surface of the reflecting mirror m17 facing the inner tube 5a is It will be located outside,
Due to this shift, interference between the front fork 3 and the reflecting mirror 17 can be avoided. Therefore, assuming that the rotation angle of the front fork 3 is the same as before, the lamp body 16 can be positioned rearward by the amount of the above-mentioned deviation, and the amount of forward protrusion of the projector lamp 15 can be suppressed. Further, FIG. 6 discloses a fourth embodiment of the present invention.

In this fourth embodiment, the left and right projector lamps 15 are supported by the front fork 3 and are rotated integrally with the front fork 3. The configuration is the same as that of the first embodiment.

In the case of this fourth embodiment as well, the reflecting mirror 17 is inclined in a direction closer to the vehicle body center line X, -X as it goes rearward, so that the reflecting mirror 17 fits between the inner tubes 5a.

Therefore, assuming that the spacing between the left and right projector lamps 15 is the same as before, interference between the reflector 17 and the inner tube 5a can be avoided, and compared to the conventional case, the projector lamp 15 can be placed in the steering head vibe 2. Can be placed close together.

In each of the above embodiments, a halogen bulb was used as the light source, but the present invention is not limited to this, and a discharge lamp such as a metal halide lamp may be used instead of the halogen bulb.

[Effects of the Invention] According to the present invention described in detail above, the reflecting mirrors of the left and right projector lamps are positioned offset in the direction away from the left and right fork tubes of the front fork, so that interference between these reflecting mirrors and the fork tubes is prevented. This makes it possible to move the projector lamp closer to the steering shaft and thereby reduce the amount of forward protrusion of the projector lamp.

[Brief explanation of drawings]

Figures 1 to 3 show an S1 embodiment of the present invention, Figure 1 is a sectional view showing the relationship between the projector lamp and the front fork, and Figure 2 is a side view of the front area of the motorcycle. , FIG. 3 is a view in the direction of the arrow m in FIG. 2, FIG. 4 is a cross-sectional view showing the second embodiment of the present invention, and FIG.
Embodiment FIG. 6 is a sectional view showing a fourth embodiment of the present invention. 1... Vehicle body (frame), 2... Steering head pipe, 3... Front fork, 4... Fork tube, 6... Bracket, 7... Steering shaft, 12... Headlamp , 15... Projector lamp, 17... Reflector, 19... Light source (halogen bulb) 21... Convex lens, A... Lens center line, A2... Reflector center line. 3-1-Front Y-Folder 4--F τ-Cute Effect 6--Fraque Note 7--Steering Link Shaft 12-m-Head Runer 15--Bed Ectaph 77'' Fig. 1 1Ik4 Ward No. 6

Claims (1)

[Claims] A front fork has a pair of left and right fork tubes, and the upper parts of these fork tubes are connected by a pair of upper and lower brackets. It is equipped with a steering shaft rotatably supported on the pipe, and a pair of headlamps arranged side by side in front of the steering head pipe, the headlamps having reflective elliptical cross sections with an open front end. These left and right projectors are equipped with a projector lamp that has a mirror, a light source is placed at a first focal point inside the reflecting mirror, and a convex lens is placed in front of a second focal point where the light reflected by the reflecting mirror gathers. The lamp is arranged such that the lens center line connecting the center of the convex lens and the second focal point is parallel to each other along the longitudinal direction of the vehicle body, and the center line of the reflecting mirror connecting the first focal point and the second focal point of the reflecting mirror is arranged parallel to each other along the longitudinal direction of the vehicle body. A headlamp device for a motorcycle, characterized in that the reflector center line is arranged to be inclined in the left-right direction of the vehicle body with respect to the lens center line, and the direction of inclination of the reflector center line is opposite to that of the left and right projector lamps. .