JPS6332748Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a pivot holding structure in an optical axis adjustment device for a vehicular lamp.

[Background of the idea]

BACKGROUND OF THE INVENTION In a vehicle lamp, for example, a headlamp, the optical axis is adjusted when it is assembled to a vehicle body. Figures 1a, b, and c show the headlamp assembled to the vehicle body; Figure 1a is a plan view, and Figure 1b is A in Figure 1a.
-A' line sectional view, FIG. 1c is a BB' line sectional view of FIG. 1a. In these figures, 1 is a headlamp, 2 is a lens, 3 is a reflector, 4a,
Reference numeral 4b indicates seats for screws 4c and 4d provided at two opposing corners of the reflector 3, and 5 indicates a pivot mechanism.A pivot shaft body 6 is attached to the reflector 3 side, and a pivot ball 6' is attached to the vehicle body 7 side. The pivot holder 8 that holds the rivets 9a and 9b
It is installed by Reference numeral 10 denotes a spring attached to a portion opposite to the mounting position of the pivot mechanism 5, one end of which is fitted into a hole 11 formed in the vehicle body and fixed, and the other end is brought into contact with the lower corner of the reflector 3. . 12 is the catch of the screw 4d (female thread)
It is fixed to the vehicle body 7 with rivets 13 and 14. The concave portion indicated by the broken line is a bulb accommodating portion formed by an extension of the reflector 3, and the concave surface is mirror-finished to serve as a reflective surface.

In the same configuration, a case will be described in which the lamp optical axis is adjusted. First, when the optical axis is directed upward (vertical angle adjustment), the lamp 1 is moved to the pivot mechanism 5 by rotating the screw 4d shown in FIG. It rotates around the pivot shaft 6 as a fulcrum and aligns it with an arbitrary optical axis. Once positioned at a predetermined angle, the bottom surface of the reflector 3 is pushed up and held by the spring pressure of the spring 10, and this state is maintained. Also, when adjusting the optical axis left and right (horizontal angle adjustment), use the screw 4a.
By rotating the pivot shaft 6 of the pivot mechanism 5, the pivot shaft 6 of the pivot mechanism 5 is rotated as a fulcrum in the same manner as described above, and the pivot mechanism 5 is positioned at a desired position and is pushed up and held by the spring pressure of the spring 10.

However, according to such a conventional optical axis adjustment structure, backlash occurring in the pivot mechanism, grooves 4 formed in the heads of the screws 4a and 4b,
The sliding spherical surface between the pivot ball 6' and the pivot holder 8 is worn down due to the play that occurs in the gaps between e and 4f and the seats 4a and 4b, as well as the play that occurs due to the vibration of the spring 10.
The push-up holding force of 0 is not enough, and as it ages, the wobbling becomes severe.

Next, regarding the conventional structure of the pivot ball 6' and pivot holder 8, which is one of the causes of backlash,
This will be explained with reference to FIG. Fig. 2 shows a case where the pivot holder 8 and the pivot ball 6' are machined in concentric circles, and both edges 8a and 8b, which are the pivot receiving surfaces of the pivot holder 8, are the pivot ball 6'. The diameter is larger than the ball diameter, and the contact surface is a single point contact at approximately the center of the receiving surface. As a result, both edges 8a and 8b were further worn away by vibrations, and the backlash especially in the direction of the arrow became large, and there was a risk that the pivot ball 6' would come off.

[Purpose of invention]

The present invention was devised in view of the problems in the prior art described above, and an object of the present invention is to provide a pivot holding structure that eliminates rattling in the pivot mechanism and has a large holding force.

[Summary of the idea]

The features of this invention are that the pivot shaft body is attached at one end to the vehicle body side and has a pivot ball formed at the other end, and is divided into two parts, each forming a holding spherical surface for the pivot ball, and the holding spherical surfaces facing each other to form a pivot shaft body on the vehicle body side. a pivot holder that holds the pivot sphere of the pivot shaft body by fixing it to the pivot holder, and the outer diameter of the pivot sphere of the pivot shaft body is equal to the inner diameter of the holding sphere surface of the pivot holder that holds the pivot sphere. This is a larger point.

[Example of idea]

Hereinafter, the present invention will be described in detail with reference to FIGS. 3a-d, FIGS. 4a, b, 5a, b, and 6.
3a to 3d show an embodiment of the present invention, and the same reference numerals as in FIG. 1 indicate the same parts. Figure 3a is a plan view of the headlamp;
Figure 3b is a sectional view taken along line C-C' in Figure 3a, Figure 3c
is a sectional view taken along the line D-D' in Figure 3a, and Figure 3d is a cross-sectional view taken along the line D-D' in Figure 3a.
FIG. 4 is an enlarged cross-sectional view of section Q in FIG. b. As shown in these figures, the headlamp angle adjustment mechanism consists of a three-point pivot mechanism. That is, a pivot mechanism 1 that adjusts the angle in the horizontal and vertical directions.
5, 16, and a pivot mechanism 17 that serves as a fulcrum shaft when adjusting both angles. The vertical angle adjustment mechanism, as shown in the enlarged sectional view of FIG. It consists of an angle adjustment screw 21 with a pivot ball 20 that is held in place, a metal plate 22 that sandwiches the reflector collar 18 and pivot holders 19, 19', and rivets 23, 24 that swage them together. .

According to the same configuration, by rotating the angle adjustment screw 21, which is a pivot shaft body, with a screwdriver, the angle adjustment screw 21 moves in the direction of arrow P along the catch seat 12, and is adjusted and set to an arbitrary angle. . The fulcrum in that case is pivot 5. Further, when adjusting the vertical optical axis angle, the angle of the optical axis is arbitrarily adjusted by rotating an angle adjusting screw 25 having a pivot mechanism having the same structure as that in FIG. 3c.

FIG. 3d is an enlarged cross-sectional view of part Q in FIG. 27, 27' to the protrusions 28, 28' of the reflector 8, and by assembling the pivot ball 30 of the pivot shaft body 29.
The spherical surface of is held in two places on the pivot holder.

4a and 4b are a plan view and a vertical sectional view of the two-part pivot holders 19, 19' shown in FIG. 3c, and the assembled structure is as explained in FIG. 3. However, the inner diameter of the pivot ball receiving surface of the pivot holder and the curvature of the outer peripheral surface of the pivot ball are changed. That is, as shown in FIG. 6, the pivot holder 1 is
The inner diameter R formed by 9 and 19' is made small.

5a and 5b show the shape of the pivot holders 26 and 26' shown in FIG. 3d, and show a plan view and a longitudinal sectional view, respectively. In the pivot holder shown in the same figure, as in Fig. 4b, the pivot holder 2 is smaller than the outer diameter of the pivot sphere shown by the broken line.
The inner diameter R formed by 6 and 26' is made small.

Next, the shapes of the pivot holder and the pivot shaft will be explained with reference to FIG. FIG. 6 shows the state in which the angle adjustment screw 21 is inserted between the pivot holders 19 and 19'.
The radius of the ball receiving surface of each of the divided pivot holders 19, 19' is R, the diameter of the pivot ball 20 of the angle adjustment screw 21 held thereby is φ, and the relationship of curvature is φ>R. It is in. According to the illustrated assembly, the upper and lower portions of the outer peripheral surface of the pivot ball 20 are
At the corner 19 of the pivot holder 19, 19'
a, 19b and 19c, 19d come into contact and are held firmly by two-point contact.

Therefore, the angle adjustment screw 21 is used to adjust the optical axis.
The corners 19a to 19d are worn out due to frequent rotation and vibration, and almost no play occurs. This also applies to the pivot shaft 29, which is the fulcrum.

[Effect of idea]

As is clear from the above embodiments, according to the present invention, the pivot ball is held by a pivot holder divided into two parts, and the outer diameter of the pivot ball is formed by the two pivot holders. The diameter is larger than the inner diameter of the pivot holding spherical surface, and it is designed to be held in contact at multiple points.
This has the advantage that the holding force of the pivot ball is increased and that play in that area can be prevented.

[Brief explanation of the drawing]

Figures 1 and 2 explain the prior art.
Figure 1a is a front view of the vehicle lamp, Figure 1b is the first
Fig. 1c is a sectional view taken along line A-A' in Fig. 1a; Fig. 2 is a sectional view showing the assembled state of the pivot holder and pivot ball; 3 to 6 show one embodiment of the present invention, in which FIG. 3a is a front view of the vehicle lamp, FIG. 3b is a cross-sectional view taken along line C-C' in FIG. Figure 3c is a sectional view taken along the line D-D' of Figure 3a, Figure 3d is an enlarged sectional view of the main part of Figure 3b, Figures 4a and b, and Figures 5a and b are pivot views. A plan view and a partial sectional view of the holder, and FIG. 6 is a sectional view showing the assembled state of the pivot holder and the pivot ball. 15, 16, 17... Pivot mechanism, 18...
Collar, 19, 19', 26, 26'... Pivot holder, 20, 30... Pivot ball, 21... Angle adjustment screw, 22... Metal plate, 23, 24... Rivet, 27, 27'... ...Screw, 28, 28'...
Projection, 29...Pivot shaft body.

Claims (1)

[Scope of utility model registration request] In a pivot holding structure in an optical axis adjustment device for a vehicle lamp, the pivot shaft body is attached to the vehicle body at one end and has a pivot sphere formed at the other end, and the pivot shaft body is divided into two parts, each forming a holding spherical surface for the pivot sphere, and a pivot holder that holds the pivot ball of the pivot shaft by fixing it to the vehicle body side with the holding spherical surfaces facing each other; A pivot holding structure for an optical axis adjustment device for a vehicle lamp, characterized in that the inner diameter is larger than the inner diameter of a holding sphere of a pivot holder.