JPH0831210A - Vehicular lamp - Google Patents

Abstract

PURPOSE:To enable a vehicular lamp having an air vent mechanism communicating-the inside of a lamp space with outside air to keep water out, have a good molding property and be formed at low cost. CONSTITUTION:A cylindrical wall 7 is projected from a lamp body 2, and a partition 10 partitioning the inside of the cylindrical wall into upper and lower parts is formed, and the inside part 11 of the cylindrical wall above the partition is communicated with a lamp space 4, and a notch 9 open to the rear end is formed in the center of the lower part of the cylindrical wall. A cap 16 comprising a cylinder part 17 to be fitted over the cylindrical wall and a closed wall 18 covering the rear end of the cylinder part is fitted over the cylindrical wall in such a way that at least part of the notch is not covered. Thus the lamp space is communicated with the outside by a course from the upper part of the inside of the cylindrical wall to the portion between the rear end of the cylindrical wall and the closed wall of the cap to the lower part of the inside of the cylindrical wall to the notch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a new vehicular lamp. More specifically, the present invention relates to a vehicular lamp having an air venting mechanism that communicates the interior of the lamp space with the outside air, and provides a novel vehicular lamp that is difficult to enter water, has good moldability, and can be formed at low cost.

[0002]

2. Description of the Related Art In a vehicular lamp, an air bleeding mechanism is provided in order to cope with a change in internal pressure due to a high temperature inside the lamp chamber when the lamp is turned on and a decrease in internal pressure when the lamp is turned off.

FIG. 6 shows an air venting mechanism in a conventional vehicular lamp.

Reference numeral a is a lamp body, and a through cylinder b protruding rearward is formed in the lamp body a, and one end portion of a rubber waterproof tube c having a substantially U-shaped side surface is formed on the through cylinder b. It is fitted over.

Therefore, the inside and outside of the lamp body a are communicated with each other through the communicating cylinder b and the waterproof tube c. Then, the waterproof tube c is fitted onto the through cylinder b to prevent water from entering.

[0006]

By the way, in the above-described conventional air venting mechanism for a vehicular lamp, there is a problem that the work of attaching the waterproof tube c to the through cylinder b must be done manually.

That is, since the waterproof tube c is formed of rubber and is easily deformed, it is difficult to hold it by a machine and it must be done by hand.

Further, the waterproof tube c made of rubber is easily deformed, and it is complicated to mount it on the through cylinder b even by hand. Further, depending on the lamp, there are several places where the waterproof tube c is attached, and it takes a lot of time to do all of these by hand, resulting in an increase in cost.

Further, there is a problem that the rubber waterproof tube c itself is expensive.

[0010]

In order to solve the above-mentioned problems, a vehicular lamp of the present invention has a cylindrical wall projecting from a lamp body, and a partition wall for partitioning the inside of the cylindrical wall into upper and lower parts. ,
An upper portion of the partition wall inside the tubular wall is communicated with the lamp space, a notch having a rear end opened at the center of a lower portion of the tubular wall, and a tubular portion externally fitted to the tubular wall. A cap including a closing wall that covers the rear end of the tubular portion is fitted onto the tubular wall so as not to cover at least a part of the cutout, and thereby, the upper portion inside the tubular wall and the rear end of the tubular wall. The lamp space is communicated with the outside through a portion called a notch, a lower portion inside the tubular wall, and a closed wall of the cap.

[0011]

Therefore, in the vehicular lamp of the present invention, the air venting mechanism can be formed only by externally fitting the cap to the cylindrical wall formed integrally with the lamp body, and can be manufactured at extremely low cost. it can.

Further, the cylindrical wall integrally formed with the lamp body has a cylindrical shape, and is constituted by a partition wall for partitioning the inside into upper and lower parts and a notch opened at the rear end. It is not necessary to use a slide core in the lamp body molding die for forming, and the cost can be reduced in this respect as well.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the vehicular lamp of the present invention will be described below with reference to the illustrated first embodiment.

Reference numeral 2 denotes a lamp body made of synthetic resin, for example, ABS resin, which has a recessed portion which is open toward the front, and a lens 3 is attached so as to close the opening and a lamp space 4 which is substantially sealed. Is formed. And the lamp space 4
A light bulb 5 is arranged inside.

The rear wall 6 of the lamp body 2 is integrally formed with a cylindrical tubular wall 7 protruding rearward.

Both the outer peripheral surface and the inner peripheral surface of the cylindrical wall 7 have a slight inclination with respect to the axis thereof (so-called drafting inclination for die cutting), that is, the outer peripheral surface approaches the axis toward the rear end.
Further, the inner peripheral surface has a distance from the axis as it goes to the rear end.

The axial direction of the cylindrical wall 7 is the lamp body 2
It coincides with the die cutting direction of the mold at the time of molding.

A step surface 8 facing rearward is formed at a position slightly closer to the rear end than the middle in the front-rear direction of the outer peripheral surface of the cylindrical wall 7. Further, a notch 9 opening to the rear end is formed at the center of the lower end of the tubular wall 7, and the front end of the notch 7 is close to the base of the tubular wall 7, that is, beyond the step surface 8 and beyond. It has reached to the front.

Reference numeral 10 denotes an upper and lower portion 1 inside the cylindrical wall 7.
The partition wall divides the lamp body 2 from the rear wall 6 and the tubular wall 7 integrally with each other. The rear end of the partition wall 10 is located in the same plane as the rear end of the cylindrical wall 7. Further, a so-called draft gradient is formed on the upper and lower surfaces of the partition wall 10, but the gradient of the upper surface 10a is formed slightly larger. That is, the upper surface 10a is slightly inclined rearward and downward.

A communication port 13 is formed in a portion of the rear wall 6 of the lamp body 2 corresponding to the front end of the upper portion 11 in the cylindrical wall 7.

Reference numeral 14 denotes a surrounding wall integrally projecting from the rear wall 6 so as to cover the upper and left and right sides of the cylindrical wall 7, and has an upper surface portion 14a having a V shape when viewed from the rear and the upper surface portion. Side portions 14b extending straight downward from both ends of 14a, 1
And 4b are integrally formed.

Reference numeral 15 denotes an impermeable wall integrally provided so as to cover the lower portion of the rear wall 6 and the lower portion of the cylindrical wall 7, and has a substantially V shape when viewed from the rear.

Then, the surrounding wall 14 and the impermeable wall 15
The amount of protrusion from the rear surface wall 6 is slightly larger than that of the cylindrical wall 7, for example, about 1.5 times the amount of protrusion of the cylindrical wall 7.

Reference numeral 16 denotes a cap which is made of synthetic resin, for example, polypropylene, and which is fitted onto the cylindrical wall 7, and has a cylindrical portion 17 having a short cylindrical shape which is fitted on the cylindrical wall 7 and the cylindrical portion. A closing wall 18 that closes the rear end 17 is integrally formed.

The cylindrical portion 17 has a short cylindrical shape, and its axial length is approximately 1.5 times the length from the step surface 8 of the cylindrical wall 7 to the rear end.

Further, a rib 19 is provided on the outer peripheral surface of the cylindrical portion 17 near the rear end so as to project over the entire circumference.

Then, the tubular portion 17 of the cap 16 is fitted onto the tubular wall 7. This external fitting is performed until the tip of the tubular portion 17 contacts the step surface 8 of the tubular wall 7. Further, in a state where the cap 16 is fitted onto the cylindrical wall 7, the cap 16
The rear end is located slightly in front of the rear ends of the surrounding wall 14 and the impermeable wall 15. And this cap 16
The notch 9 formed at the lower end portion of the cylindrical wall 7 by the external fitting to the cylindrical wall 7 covers the rear portion of the step surface 8 but opens the front portion of the step surface 8.

Then, as described above, when the cap 16 is externally fitted to the cylindrical wall 7, the lamp space 4 is communicated with the communication port 13,
The upper portion 11 inside the tubular wall 7, the portion between the rear end of the tubular wall 7 and the closing wall 18 of the cap 16, the lower portion 12 inside the tubular wall 7, and the front side of the step surface 8 of the notch 9. A ventilation passage is formed through the portion and reaches the outside.

In the vehicle lamp 1, the lamp space 4 is
Ventilation with the outside is ensured, and the passage for ventilation is meandering, so that it is difficult for water to enter from the outside.

The surrounding wall 14 prevents water coming from above or from the side from hitting the tubular wall 7 and the cap 16, and the impermeable wall 15 allows water coming from below to come from the tubular wall 7 and the cap 16. Prevent from falling.

Further, since the cylindrical wall 7 formed integrally with the lamp body 2 does not have a so-called undercut portion in the die cutting direction at the time of molding the lamp body 2, it is not necessary to use a slide core. It has the advantages of good moldability and low cost.

Further, since the cap 16 fitted on the rear end portion of the tubular wall 7 is made of synthetic resin, it is cheaper than the conventional rubber waterproof tube and has a high rigidity. External fitting to the wall 7 can be easily performed.

Furthermore, since the rib 19 is formed on the rear end portion of the tubular portion of the cap 16 over the entire circumference, it is easy to hold it when it is fitted onto the tubular wall 7, and the workability is good. Become. In addition, when the cap 16 is splashed with water, the water will be absorbed by the rib 19.
It also has the advantage of quickly gathering at the lower end and falling down.

Further, since the rear end of the partition wall 10 is located in the same plane as the rear end of the cylindrical wall 7, when checking the airtightness, that is, the airtightness of the lamp space 4, It is easy to apply a sealing member to these rear ends for sealing.

Further, since the upper surface 10a of the partition wall 10 is inclined rearward and downward, the upper part 1 in the cylindrical wall 7 should be held by any chance.
Even if water enters the inside of 1, the water is quickly discharged along the slope.

Furthermore, since the notch 9 is formed at the center of the lower end, even if water should enter the lower part 12 of the tubular wall 7, the water will be quickly discharged.

[0037]

As is apparent from the above description, the vehicular lamp of the present invention is defined by a lamp body which is opened substantially forward and a lens which is attached to the lamp body so as to cover the opening. In a vehicular lamp in which a light source is arranged in a sealed lamp space, a cylindrical wall is provided so as to project from the lamp body, and a partition wall is formed to vertically partition the inside of the cylindrical wall. An upper portion of the partition wall is communicated with the lamp space, a notch having a rear end opening is formed in the lower center of the tubular wall, and covers the tubular portion fitted on the tubular wall and the rear end of the tubular portion. A cap composed of a closing wall is fitted onto the cylindrical wall so as not to cover at least a part of the notch, whereby the upper part inside the cylindrical wall, the rear end of the cylindrical wall and the closing wall of the cap. The space between the above, the lower part inside the tubular wall, and the above-mentioned lighting space through a path called a notch. Characterized in that it communicate with the outside.

Therefore, in the vehicular lamp of the present invention, the air bleeding mechanism can be formed only by externally fitting the cap to the cylindrical wall formed integrally with the lamp body, and can be manufactured at extremely low cost. it can.

The cylindrical wall integrally formed with the lamp body has a cylindrical shape and is constituted by a partition wall for partitioning the inside into upper and lower parts and a notch opened at the rear end. It is not necessary to use a slide core in the lamp body molding die for forming, and the cost can be reduced in this respect as well.

It should be noted that the shapes and structures of the respective parts shown in the above-mentioned embodiments are merely examples of the embodiment when the present invention is carried out, and the technical scope of the present invention is thereby provided. It should not be construed as limiting.

[Brief description of drawings]

FIG. 1 shows an example of an embodiment of a vehicular lamp of the present invention, together with FIGS. 2 to 5, and is a vertical sectional view showing the whole.

FIG. 2 is a partially cutaway perspective view showing an enlarged main part.

FIG. 3 is a rear view showing an enlarged main part.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a sectional view taken along the line VV of FIG. 3;

FIG. 6 is a cross-sectional view showing an example of a conventional vehicle lamp.

[Explanation of symbols]

 1 Vehicle Lighting 2 Lamp Body 3 Lens 4 Lighting Space 5 Light Bulb (Light Source) 7 Cylindrical Wall 9 Notch 10 Partition 11 Upper Part 12 Lower Part 16 Cap 17 Cylindrical Part 18 Closing Wall 19 Rib

Claims (2)

[Claims] 1. A vehicular lamp in which a light source is arranged in a sealed lamp space defined by a lamp body which is opened substantially forward and a lens which is attached to the lamp body so as to cover the opening. A cylindrical wall is projected on the body,
A partition wall for partitioning the inside of the cylindrical wall into upper and lower portions is formed, an upper portion of the partition wall inside the cylindrical wall is communicated with the lamp space, and a notch opening at a rear end is formed in a lower center of the cylindrical wall. Then
A cap composed of a tubular portion externally fitted to the tubular wall and a closing wall covering the rear end of the tubular portion is externally fitted to the tubular wall so as not to cover at least a part of the notch, and thereby the tubular The upper part of the interior of the tubular wall, the part between the rear end of the tubular wall and the closing wall of the cap, the lower part of the interior of the tubular wall, and the lamp space communicated with the outside through a path called a notch. A vehicle lamp. 2. The vehicular lamp according to claim 1, wherein ribs are provided on the outer peripheral surface of the tubular portion of the cap over the entire circumference.