JPS6347155Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a device for adjusting the optical axis direction of a headlamp.

[Background of the idea]

Since the horizontality of the body of a freight vehicle changes depending on changes in cargo, the direction of the optical axis of the headlamp attached to the body changes. For this reason, the headlamp is provided with an optical axis adjustment device. This optical axis adjustment device requires the ability to freely rotate the headlamp from the driver's seat, and must have a structure that allows the initial adjustment of the optical axis direction according to a predetermined standard before shipment from the production factory.

There have been various types of optical axis adjustment devices satisfying the above performance, and the applicant previously proposed the devices shown in FIGS. 6 and 7. The structure will be explained below.

A headlamp body 1 is rotatably supported by a fulcrum 2, and a rim 3' is fixed to the headlamp body 1.

An actuator 4 is fixed to a part 5 of the vehicle body, and has a structure in which a piston rod 4a is expanded and contracted by remote control from the driver's seat.

Between the piston rod 4a and the rim 3',
An L-shaped lever 8' having a long side 8'a and a short side 8'b is supported by a pivot shaft 10 passed through a bearing hole 8'c.
It is rotatably supported on a bracket 9. The piston rod 4a of the actuator and the long side 8'a of the L-shaped lever 8' are rotatably connected by a pivot 6. The short side 8'b has the bearing hole 8'c.
A bearing hole 8'd is provided in parallel with the shaft member 11, into which the shaft member 11 is rotatably fitted. This shaft member 11 is provided with a screw hole 11a perpendicular to its axis, and the L-shaped lever 8'
and the rim 3', and one threaded end of the rod 7' is threaded through the threaded end. A driver groove 7'c is cut in one end of this rod 7'. A ball portion 7'a is integrally connected to the other end of the rod 7', and a driver groove 7'b is provided at the top of the ball portion 7'a.
On the other hand, a pivot holder 12 is fixed to the rim 3', and the pivot holder 12 holds the rod 7'.
The ball portion 7'a is rotatably supported. In the above manner, the piston rod 4a and the rim 3 are connected,
The movement of the piston rod 4a is transmitted to the L-shaped lever 8', the rod 7', and the rim 3', and the headlamp body 1 rotates about the fulcrum 2, functioning as an optical axis adjustment device.

According to the above-mentioned conventional optical axis adjustment device, before the movement of the piston rod 4a of the actuator 4 is transmitted to the headlamp body 1, the piston rod 4a, the pivot 6, the shaft member 11, the bearing hole 8'd, and the ball of the rod 7' are adjusted. The movement is transmitted while rotating at three locations: the portion 7'a and the pivot holder 12. Here, the shaft member 11 can only be rotated in a direction orthogonal to the axial direction of the shaft member 11 with respect to the bearing hole 8'd. For this reason,
There is no problem if the optical axis adjustment device is assembled with high precision, but in reality, the bearing hole 8'd and the rod 7' are not exactly orthogonal due to misalignment during assembly. In many cases, when the shaft member 11 rotates, an unreasonable force is generated between the shaft member 11 and the bearing hole 8'd. When this unreasonable force is generated, the rotation of the shaft member 11 becomes stiff, making it difficult to finely adjust the optical axis, or even leading to destruction of parts near the shaft member 11. Further, since the rod 7' has a pivot at one end, it cannot be easily attached or removed, and the pivot is weak against vibration and has a weak holding strength.

[Summary of the idea]

In order to solve the above problems, the headlamp optical axis adjustment device of the present invention fixes a rim to a rotatably supported headlamp, and provides a pivot between an actuator that rotates the headlamp and the rim. An L-shaped lever supported by a shaft is provided, an output member of the actuator is engaged with the long side of the L-shaped lever, a rod is provided to connect the rim and the L-shaped lever, and a rod is provided on the short side of the L-shaped lever. A shaft member arranged parallel to the pivot shaft of the lever and loosely fitted is rotatably supported, a screw hole perpendicular to the shaft center is provided in the shaft member, one end of the rod is screwed into the shaft member, and the other end of the rod is screwed into the shaft member. A groove perpendicular to the axial direction of the rod is provided in the rim, and a notch 11 is provided in the rim to fit the rod groove, and the rod is fitted into the rim. It is characterized by passing through a hole.

[Embodiment of the Invention] Hereinafter, a first embodiment of the optical axis adjustment device for a headlamp according to the present invention will be described with reference to FIGS. 1 to 3.

This embodiment is an improvement by applying the present invention to the device shown in FIGS. 6 and 7 as a conventional example. Items with the same reference numerals as in FIGS. 6 and 7 are the same as the conventional example. The same parts are shown.

FIG. 1 is a diagram showing the entire optical axis adjusting device of this embodiment, and FIG. 2 is an exploded perspective view showing the main parts.

8 is an L-shaped lever corresponding to the L-shaped lever 8' in the conventional device, 8a is the long side, 8b is the short side,
8c is a bearing hole for the pivot shaft 10, which is rotatably fixed to a bracket 9 fixed to a part of the vehicle body via the pivot shaft 10 and its stopper 14. The tip of the piston rod 4a of the actuator 4 is connected to the long side 8a of the L-shaped lever 8 via the pivot 6.
A bearing hole 8d is provided in the short side 8b of the L-shaped lever 8 in parallel with the bearing hole 8c, into which the shaft member 15 is rotatably fitted. As shown in FIG. 2, this shaft member 15 has both end portions 15b having a smaller diameter than the center portion 15c, and the diameter of the center portion 15c is approximately the same as the diameter of the bearing hole 8d. A screw hole 15a perpendicular to the axis of the bearing portion 15 is provided in the central portion 15c. This screw hole 15a, as shown in FIG.
A plurality of protrusions are provided in the direction of the center axis of the hole, and a screw can be screwed in by self-tapping.

The shaft member 15 is connected to the bearing hole 8 of the L-shaped lever 8.
d, insert the rod 7 into the screw hole 15a.
One end is screwed in, and the tip protrudes from the short side 8b. This rod 7 has a screw thread cut on one end side which is screwed into the shaft member 15, and a driver groove 7c is provided at the tip of the one end side. On the other end of the rod 7, a hexagonal nut portion 7b is formed at the tip, a driver groove is cut in the head of the hexagonal nut, and a groove 7a is formed adjacent to the hexagonal nut portion 7b. As described above, the rod 7 is formed and screwed into the shaft member 15, but before being screwed into the shaft member 15, it passes through the through hole 13a of the holder 13. This holder 13 is a single plate-shaped member fixed to the bracket 9, and the through hole 13a is made slightly thicker than the diameter of the rod 7. The other end of the rod 7 is fitted into the groove 7a into a notch 3a provided in the rim 3 fixed to the headlamp body 1.

As described above, since the piston rod 4a of the actuator 4 is connected to the rim 3 fixed to the headlamp body 1, the piston rod 4a expands and contracts, the lever 8 rotates, and the rod 7 moves. The rim 3 moves, the headlamp body 1 rotates, and the optical axis is adjusted.

According to the optical axis adjusting device configured as described above, only the center portion 15c of the shaft member 15 has the bearing hole 8.
d, and both ends 15b supported by the bearing hole 8d have a smaller diameter than the bearing hole 8d, so that the shaft member 15 is loosely fitted into the bearing hole 8d, and the shaft member 15 is inserted into the bearing hole 8d by the amount of play. can be tilted with respect to the central axis of Therefore, even if the rod 7 is not exactly perpendicular to the central axis of the bearing hole 8d due to misalignment during assembly, the shaft member 15 will not exert unreasonable force on the lever 8. It can be rotated, the optical axis can be adjusted smoothly, and parts near the shaft member 15 will not be destroyed. Also, the connection between the rim 3 and the rod 7 is as follows.
This is done by simply fitting the groove 7a of the rod 7 into the notch 3a of the rod 7, so it is easier to install and remove than when using a pivot.
It is resistant to vibration and has strong holding strength. moreover,
Since there is no pivot, the parts that made up the pivot are no longer needed, and the end of the rod 7 can now be formed into a hexagonal nut shape, making it easier to make adjustments during assembly. In addition,
Rod 7 is located near the center through hole 13a of holder 13.
Because it passes through the through hole 13, movement in directions other than the axial direction
Even if there is play between the shaft member 15 and the bearing hole 8d of the lever 8 and between the groove 7a of the rod 7 and the notch 3a of the rim 3, only the movement of the rod 7 in the axial direction is It is transmitted reliably and the rod 7 will not come off.

Next, a second embodiment of the optical axis adjustment device for a headlamp according to the present invention will be described with reference to FIGS. 4 and 5.

In this embodiment, the shape of the holder that guides the rod 7 is changed.

This holder is divided into two parts, a main holder 16 and a sub holder 17. The main holder 16 has a through hole at the end for mounting the bracket 9, and a square protrusion in the center. A square through hole 16a is opened. The sub holder 17 is
It is a square and elongated member sized to fit into the through hole 16a, and has a through hole 17a in the center for passing the rod 7 through. This through hole 17a is provided with a plurality of protrusions along the central axis of the hole, similar to the threaded hole 15a of the shaft member 15 described in the first embodiment, and the rod 7 is threaded. When inserted from the other end, the sub holder 17 and the rod 7 are screwed together by self-tapping, and the sub holder 17 and the rod 7 are integrated. For this purpose, the thread of the rod 7 is cut long from the end. Then, the sub holder 17 integrated with the rod 7 is passed through the through hole 17a of the main holder 16 fixed to the bracket 9, and then attached to the shaft member 15 for assembly.

In the optical axis adjustment device assembled in the above manner, the movement of the rod 7 is completely restricted to only the movement in the axial direction by the main holder 16 and the sub-holder 17, so the deflection of the rod 7 is completely eliminated.
The optical axis can be adjusted with higher precision than in the first embodiment.

In the first and second embodiments described above, only both ends of the shaft member are made thin so that the shaft member is loosely fitted into the bearing hole, but the structure is not necessarily limited to this.

[Effect of idea]

As is clear from the above embodiments, according to the optical axis adjustment device for a headlamp according to the present invention, the shaft member to which the rod is attached in an orthogonal state is loosely fitted into the lever, so that the shaft member can be tilted and accurately adjusted. Even if it is not assembled, the movement of the actuator can be smoothly transmitted to the headlamp body and the optical axis can be adjusted.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the headlamp optical axis adjustment device of the present invention, FIG. 1 is a partially sectional side view showing the whole, and FIG. 2 is an exploded perspective view of the main parts. Figure 3 is a perspective view showing the through hole of the shaft member,
4 and 5 show a second embodiment of the headlamp optical axis adjustment device of the present invention, FIG. 4 is a partially sectional side view of the main part, and FIG. 5 is an exploded perspective view of the main part. be. 6 and 7 show an example of a conventional optical axis adjustment device for a headlamp. FIG. 6 is a partially sectional side view showing the entire device, and FIG. 7 is an exploded perspective view of the main parts. 1... Head lamp body, 3... Rim, 3a...
...Rim notch, 4... Actuator, 5...
Part of the car body, 7...rod, 7a...groove, 7b...
...Hexagonal nut part, 7c...Driver groove, 8...
L-shaped lever, 8a...long side, 8b...short side, 8
c, 8d... Bearing hole, 9... Bracket, 10...
...Pivot shaft, 13...Holder, 13a...Through hole,
15... Shaft member, 15a... Screw hole, 15b...
Both ends, 15c...Central part, 16...Main holder, 16a...Through hole, 17...Sub-holder, 17
a...Through hole.

Claims (1)

[Scope of utility model registration request] A rim is fixed to a rotatably supported headlamp, an L-shaped lever pivotally supported by a pivot shaft is provided between an actuator for rotating the headlamp and the rim, and the output member of the actuator is connected to the L-shaped lever. A rod is provided that is attached to the long side of the lever and connects the rim and the L-shaped lever, and a shaft member that is disposed parallel to the pivot shaft of the lever and loosely fits on the short side of the L-shaped lever is rotatably provided. supporting the rod, providing a screw hole perpendicular to the axis in the shaft member to screw one end of the rod, and providing a groove perpendicular to the axial direction of the rod in the other end of the rod;
A headlamp light characterized in that the rim is provided with a notch that fits into the groove of the rod, into which the rod is fitted, and the center of the rod is passed through a hole in a holder attached to a part of the vehicle body. Axis adjustment device.