JPS6239959Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the improvement of retractable headlamps for automobiles, and relates to retractable headlamps that use a link mechanism and a motor as the opening/closing mechanism of the headlamp. An object of the present invention is to provide a retractable headlamp for an automobile whose upright position changes as little as possible when the headlamp is turned on.

Recently, when the headlights of automobiles are not in use, such as during the daytime, the headlights are pulled into the front body and stored so that they cannot be seen from the outside, and when the lamps are used, such as at night, the headlights are pulled out from inside the front body and turned on. A so-called retractable headlamp constructed in this manner is employed.

This retractable headlamp generally has a structure as shown in FIGS.
The lamp link 4 fixed to the headlamp 1 and the motor link 7 fixed to the drive shaft 6 of the motor 5 are connected by a link rod 8 and pins 9 and 10. ,
By stopping the motor 5 at a predetermined position,
The headlamp 1 is configured to be freely opened and closed between an upright position when it is lit as shown in the figure and a storage position when not in use (not shown). By the way, the conventional retractable headlamp with the above configuration has a second
As is clear from the figure, the link rod 8 is arranged vertically and is configured to rotate within the vertical operating plane V, and when the motor link 7 and the link rod 8 are in a straight line, the headlamp 1 is turned on. It is designed to be a standing position. However, in the case of such a configuration, as will be clear from what will be described later, if there is a variation in the stop position of the motor 5, that is, the rotational stop position of the motor link 7, the variation will directly cause a variation in the upright position of the headlamp 1. That is, there was a problem in that this appeared as a fluctuation in the optical axis and dazzled oncoming vehicles.

The present invention solves the above-mentioned problems by adopting the structure described in the claims for utility model registration, and minimizes as much as possible the fluctuations in the standing position of the headlamp when it is turned on due to variations in the stopping position of the motor. A retractable headlamp for an automobile was obtained.

Before explaining the structure of the retractable headlamp of the present invention, we will first explain the motor 5 in the conventional retractable headlamp shown in FIGS. 1 and 2.
The amount of variation in the optical axis of the headlamp 1 with respect to variations in the stop position of the headlamp 1 will be analyzed.

In FIG. 1, the arm length of the motor link 7 is r ₁ ,
Assuming that the arm length of the lamp link 4 is _r2 , the state of the conventional retractable headlamp when it is erected is shown as a link connection diagram as shown in FIG. Now, assuming that the motor link 7 unexpectedly fluctuates from the normal stop position a to the left and right within a range of fluctuation angle θ _s when standing up, the deflection angle θ _e1 generated in the lamp link 4 due to this fluctuation angle θ _s is: θ _e1 = sin ^-1 h/r ₂ - sin ^-1 1/r ₂ (h - Δx ₁ )
...(1) Δx ₁ = r ₁ (1-cosθ _s ) ...(2) where h: Height between pin 3 and pin 10 at normal stopping position a Δx ₁ : Height of pin 9 due to θ _s It is expressed as the amount of displacement in the vertical direction. As is clear from equations (1) and (2) above, in the case of the conventional retractable headlamp,
The displacement amount Δx ₁ of the pin 9 due to the variation angle θ _s of the motor link 7 directly affects the deflection angle θ _e1 of the ramp link 4.

The present invention is constructed so that the displacement Δx ₁ does not directly affect the deflection angle θ _e1 of the ramp link 4 by devising the link connection angle of the link rod 8. That is, in the retractable headlamp according to the present invention, as shown in FIG. 4, the link rod 8, which was conventionally arranged in the vertical direction, is provided at an angle of .theta. with respect to the vertical operating surface v. In addition, in the drawings, the same symbols as in FIGS. 1 and 2 indicate the same members.

In this way, when the link rod 8 is tilted by θ from the vertical operating surface v, the stop position of the motor 5 varies, as shown in _FIG. θ _e2 = sin ^-1 h _' /r ₂ - sin ^-1 1/r ₂ (h'-Δx ₂
)...(3) Δx ₂ = r ₁ (1-cosθ _s ) cosθ = Δx ₁ cosθ
...(4) However, Δx ₂ : is the resolved displacement amount of Δx ₁ in the vertical direction.

Therefore, if we compare Equations (2) and (4) above, when θ≠0, Δx ₁ > Δx ₂ , and therefore, the conventional declination angle θ _e1 of the lamp link 4 and the declination angle of the present invention are The magnitude relationship between θ _e2 and θ e2 is θ _e2 < θ _e1 (5), and if the inclination angle θ is given to the link rod 8 in advance as in the present invention, the deviation of the lamp link 4 that indicates a change in the optical axis can be reduced. The angle θ _e2 can be kept slightly smaller than the deflection angle θ _e1 of the conventional retractable headlamp.

The present invention has the structure and operation as described above, and by tilting the link rod 8 by a predetermined inclination angle θ with respect to the vertical operating surface v, the standing position when the headlamp is turned on due to variations in the stopping position of the motor can be adjusted. It has the remarkable effect of minimizing the fluctuation of the optical axis, that is, the fluctuation of the optical axis, preventing dazzling of oncoming vehicles due to the fluctuation of the optical axis, and significantly improving vehicle driving safety. play.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing the structure of a conventional retractable headlamp for automobiles, Fig. 2 is a schematic front view of the same, and Fig. 3 is a diagram illustrating the operating state of the conventional retractable headlamp when it is erected. Link connection diagram; FIG. 4 is a schematic perspective view showing one embodiment of the retractable headlamp for automobiles according to the present invention; FIG. 5 is a link for explaining the operating state of the retractable headlamp according to the present invention when it is erected. It is a combination diagram. 1: Head lamp, 4: Lamp link, 5: Motor, 6: Motor drive shaft, 7: Motor link,
8: link rod, v: vertical working surface, θ: inclination angle of link rod 8.

Claims (1)

[Scope of utility model registration request] In a retractable headlamp for an automobile configured to open and close the headlamp using a link mechanism, the link rod that connects the motor link attached to the drive shaft of the motor and the lamp link connected to the headlamp with respect to the vertical operating surface. 1. A retractable headlamp for an automobile, characterized in that the retractable headlamp is arranged to be inclined at a predetermined angle of inclination θ.