JPH10144106A - Lighting fixture for vehicle and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the working efficiency of mold by shortening cooling time required when the body of a lighting fixture is formed by means of resin molding, which includes a surrounding part requiring a projected area in a metal mold. SOLUTION: Out of a leg piece 21 and a reinforcing wall 23 consisting of a surrounding part 24 formed out of a supporting leg part 7 to be provide for a lighting fixture body 1 formed by means of resin molding, an opening 25 for letting the surrounding part 24 be penetrated through outside is provided for a part of the leg piece 21. This constitution thereby enables the projected area of a metal mold for forming the surrounding part 24 to come directly in contact with the metal mold located at the outer side of the leg piece 21 through the opening 25, also enables heat generated in the projected area to be released to the metal mold outside through the opening 25, thereby enables a cooling effect at the projected area to be enhanced at the time of molding, and thereby enables an operating efficiency for resin molding to be enhanced with the cooling time of a resin product shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a vehicular lamp.
In particular, the present invention relates to a vehicle lamp in which the lamp body is formed by resin molding and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, in a vehicular lamp such as an automobile, a lamp body is formed by resin molding in order to improve resin strength and to reduce the weight and cost. In this case, not only the main body of the lamp body, but also mounting legs for mounting the assembled lamp to the vehicle body, and supports for fixing or supporting various components attached to the main body. Like the legs,
The part protruding from the main part is also resin-molded integrally with the main part. FIG. 7 is a diagram showing an example thereof.
The main body of the lamp body 1 is formed in a container shape so that the reflector and bulb of the lamp can be housed therein, and a mounting leg 8 for mounting the lamp body 1 to the vehicle body is provided on the back of the main body. In order to increase the mechanical strength of the mounting leg 8, a reinforcing wall 23 is integrally formed along both sides of a leg piece 21 protruding from the main body of the lamp body. It is configured so as to have a character shape or a cross-sectional shape close to this. An end piece 22 fixed to the vehicle body is integrally formed at the tip of the leg piece 21, and a bolt insertion hole 22b is opened.

When the mounting leg 8 having the surrounding portion 24 surrounded by the leg piece 21 and the reinforcing wall 23 is resin-molded together with the main portion, as shown in FIG. Surrounding part 2 surrounded by leg pieces and reinforcing walls
Rod-shaped or cone-shaped protruding portion 1 to be inserted into 4
03 is formed, and the other mold 100 has
A portion 104 is formed opposite to the mold 03, and the resin is injected into the cavity 102 defined between these molds to perform resin molding. Here, a part of the mold 101 is formed by the slide core 105. After the injection of the resin, the mold is cooled to cure the resin, and then the ejector pins 110 are protruded to release the molded product from the mold.

[0004]

In the resin molding of the lamp body by such a resin molding method, the surrounding portion 24 formed by the leg piece 21 and the reinforcing wall 23 of the mounting leg portion 8 is formed. The protrusion 103 provided in the mold 101 has a small area of a connection portion with the mold main body serving as a heat radiation path for releasing heat, so that the heat generated in the protrusion has a low heat radiation efficiency and a cooling efficiency. Is low. In particular, in the mold on the side where the projecting portion 103 is formed, here, the fixed mold 101 referred to as a core mold, since the ejector pins 110 are formed, a space for disposing the cooling water passage is secured. Therefore, the number of cooling water passages is reduced as compared with the movable mold 100 called a mold opposite to the mold. Also, the mounting leg 8 and the supporting leg 7 do not have a large leg width due to their functions, and since reinforcing walls are formed on both sides to obtain a required strength, a cooling water channel is formed at the projecting portion 103. It is difficult to do. As a result, the efficiency of cooling the protruding portion 103 is low, and in the cooling step of the mold during resin molding,
The cooling rate of the projecting portion 103 is significantly reduced, which affects the working efficiency of the entire resin molding.
That is, if the mold release is performed in a state where the cooling is insufficient, the mounting leg portion 8 is not sufficiently cured, and the deformation is likely to occur at the time of release or after the release, and conventionally, the mold portion is sufficiently cooled. Since the cooling is performed over a long period of time, the cooling time becomes long, and it is difficult to increase the working efficiency of the resin molding.

[0005] An object of the present invention is to reduce the cooling time when resin molding a lamp body having an enclosing portion where a projection is required in such a mold, and to improve molding operation efficiency. It is an object of the present invention to provide a vehicular lamp that can be enhanced and a method for manufacturing the same.

[0006]

SUMMARY OF THE INVENTION A vehicular lamp of the present invention comprises:
The main body of the lamp body formed in a container shape, a leg protruding from a back surface of the main body, and a reinforcing wall erected along both sides of the leg. And the reinforcing wall is formed of resin integrally with the main body, a surrounding portion is formed between the leg piece and the reinforcing wall, and the leg piece is provided with an opening as desired in the surrounding portion. It is characterized by.
The leg piece is configured as a supporting leg of the aiming rod or as a mounting leg for mounting to a vehicle body.

According to the manufacturing method of the present invention, of the pair of dies for resin molding of the lamp body, one of the dies is provided with a protruding portion to be inserted into the surrounding portion, and the other is provided with the projecting portion. A slide core, a part of which can enter the opening, is provided, and resin molding is performed with the part of the slide core being in contact with the protrusion. Alternatively, a part of the other mold can enter the opening, and the resin molding is performed in a state where the part of the other mold is in contact with the projecting portion.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a first embodiment in which the present invention is applied to a headlight of an automobile, FIG. 2 is a sectional view taken along the line AA, and FIG. 3 is a schematic rear view of a lamp body. In this headlamp, a lamp chamber is defined by a lamp body 1 formed by resin molding and a lens 2 attached to a front opening of the lamp body 1. A reflector 3 is provided in the lamp room, and is supported by an aiming adjustment mechanism 6 so as to be tiltable in the vertical and horizontal directions in the lamp body 1. The reflector 3 supports a bulb 4, and is configured to supply power to the bulb through a bulb mounting hole 5 opened on the back of the lamp body 1. The aiming adjustment mechanism 6 has a pivot shaft 10 fixed to a part of the inner surface of the lamp body 1, and a pivot receiver 11 fitted to the pivot shaft 10 is fixed to an upper part of the rear surface of the reflector 3, With this pivot structure, the reflector 3 can be tilted up, down, left and right around the pivot shaft 10.

Further, a left / right aiming adjustment unit and a vertical aiming adjustment unit having the pivot shaft 10 as a fulcrum are provided. Here, as shown only in the vertical aiming adjustment unit 12, a position immediately below the pivot shaft 10 is shown. An aiming nut 13 is fixed to a part of the back surface of the reflector, and an aiming screw 14 supported on the lamp body 1 is screwed into the aiming nut 13. The base end of the aiming screw 14 is projected out of the lamp body 1 to form a gear train mechanism 15.
The aiming adjustment rod 16 is connected to the other end of the gear train mechanism 15. The aiming adjustment rod 16 extends in the front-rear direction of the lamp, and an intermediate portion thereof is supported by a support leg 7 projecting from the rear surface of the lamp body 1. At other places on the back of the lamp body 1, a plurality of mounting legs 8 for fixing the lamp to the vehicle body are formed so as to protrude.

The supporting leg portion 7 has a leg piece 21 extending substantially straight and extending toward the rear side of the lamp body 1,
An end wall 22 bent downward at a substantially right angle toward the distal end of the leg piece 21, that is, in a direction away from the lamp body 1.
The end wall 22 has an insertion hole 22a through which the aiming adjustment rod 16 is inserted. Also, on both side edges along the length direction of the leg piece 21,
A pair of reinforcing walls 23 projecting substantially the entire length toward the side opposite to the end wall 22, and having their tips connected to a part of the rear surface of the lamp body 1 are provided upright. Needless to say, the leg piece 21, the end wall 22, and the reinforcing wall 23 are formed integrally with the lamp body 1 by resin molding. As a result, the support leg portion 7 is formed as a structure including a surrounding portion 24 surrounded by the leg piece 21, the reinforcing walls 23 on both sides, and a part of the back surface of the lamp body 1 opposed thereto. Will be done. On the other hand, the leg piece 21 is provided with an opening 25 within a size that does not reduce the mechanical strength required for the support leg 7, and the opening 25 allows the inside of the surrounding portion 24 to be formed. The leg piece 2
It penetrates through the area outside the area 1.

FIG. 4 is a sectional view of a main part of a mold structure when the lamp body 1 is molded with resin. A cavity 102 of the lamp body 1 is defined by a movable mold (cavity mold) 100 and a fixed mold (core mold) 101, and a resin is injected into the cavity from a runner and a gate (not shown) to perform molding. It has been. In the cavity for molding the support leg 7, a projection 103 provided on the core mold 101 for molding the inner shape of the surrounding portion 24 and a projection 103 provided on the mold 100 for molding are provided. A concave portion 104 is formed to receive an undercut portion. Further, in order to cope with an undercut portion generated in the support leg portion, a part of the core mold 101 is constituted by a slide core 105, and the slide core 105 supports the support die. Outer surfaces of the legs 7 are defined. The distal end surface of the slide core 105 is formed with a portion 105a that is slightly protruded to form an opening 25 provided in the leg piece 21, and the core-shaped protrusion is formed at the protruded portion 105a. It is configured to be in direct contact with the part 103. The core mold 10
1 is provided with an ejector pin 110 for releasing the lamp body from the core mold 101 after resin molding.

When the lamp body 1 is molded with resin by injecting a resin into the cavity 102 by this mold structure, the support leg 7 is provided with a projection 103 and a slide core 105 of the core mold 101 and a mold of the mold facing the slide core 105. 100 is formed by a cavity defined between the concave portions 104. When the mold 100 is released from the core mold 101 after the resin is hardened, the molded lamp body is separated from the mold 100 while being attached to the core mold 101 at this stage. . Then, when the slide core 105 is slid, the slide core 105 is retracted from the outer surface of the support leg 7. Thereafter, by ejecting and operating the ejector pin 110, the molded lamp body can be removed from the core mold 101. During this release operation, the slide core 105 is in a state of being directly in contact with the core-shaped projecting portion 103 at a position corresponding to the opening 25 of the leg piece 21 to be molded.
The heat of the protruding portion 103 can be released through the slide core 105 as shown by a dashed arrow in FIG. In particular, the cooling water passage is rarely formed in the vicinity of the projecting portion 103, but the slide core 105 has a large number of cooling water passages formed in the outer peripheral region thereof, and the temperature is low. Is quickly released to the slide core 105. As a result, the cooling effect of the protruding portion 103 is enhanced, and the cooling of the end wall 22 and the reinforcing wall 23 as well as the leg piece 21 in contact with the protruding portion is promoted. Thereby, even if the release time is shortened, the deformation of the support leg can be prevented from occurring, and the manufacturing efficiency of the resin molding can be increased accordingly.

FIG. 5 is a view showing a second embodiment of the present invention, and here is a perspective view of a main part of a lamp body when the lamp is applied to a mounting leg portion for mounting the lamp to a vehicle body. Note that parts equivalent to those in the first embodiment are denoted by the same reference numerals. In this embodiment, the leg piece 21A constituting the mounting leg portion 8 is projected in a direction inclined with respect to the mold releasing direction.
However, a pair of reinforcing walls 23 are integrally formed along both sides. Then, similarly to the above-described embodiment, in order to expose the surrounding portion 24 in which the leg piece 21A and the reinforcing wall 23 are surrounded by the outer surface of the lamp body 1 to an outer region sandwiching the leg piece 21A, An opening 25 is provided in the leg piece 21A.

FIG. 6 is a sectional view of a mold for resin-molding the lamp body of the second embodiment, particularly a mold for resin-molding the mounting leg 8. As shown in FIG. Here, since the leg piece 21A is inclined with respect to the mold release direction, the parting line PL of the mold 100 and the core mold 101 in the opening 25 is used to make the plate thickness of the opening 25 utilizing this inclination. The parting line PL is inclined with respect to the mold release direction by inclining the parting line PL with respect to the mold release direction. As a result, the undercut portion does not occur in both the mold 100 and the core 101 for molding this portion, and the slide core as in the first embodiment is not required. Therefore,
In this mold, the projection 103 of the core mold 101 for forming the surrounding portion 24 of the mounting leg 8 is in a state of being directly in contact with the mold 100 at a position corresponding to the opening 25 of the leg 21A. I have.

When resin molding of the lamp body is performed using this mold, the mounting leg 8 is molded by a cavity defined between the mold 100 and the projection 103 of the core. Then, the mold is released from the core mold 101, and then the lamp body attached to the core mold 101 is removed from the core mold 101 by the ejector pins 110 to complete the molding. Then, immediately after the mold is closed and until the mold is released, the mold 100
Is in direct contact with the protruding portion 103 of the core mold 101 at a position corresponding to the opening 25 provided in the leg piece 21A, so that heat of the protruding portion 103 can be released through the mold 100. As a result, similarly to the first embodiment, although the cooling water channel is rarely formed in the vicinity of the projecting portion 103, the heat of the projecting portion is quickly released to the mold 100 and the heat of the projecting portion 103 is reduced. The cooling effect is enhanced, and the cooling of the reinforcing wall 23 and the end wall 22 as well as the leg piece 21A in contact with the projecting portion 103 is promoted. Thus, even if the release time is shortened, the deformation of the mounting leg 8 can be prevented from occurring, and the production efficiency of the resin molding can be increased accordingly.

In each of the above embodiments, the leg pieces 21 and 21A formed as the support leg 7 and the mounting leg 8 are disposed below the surrounding portion 24.
As a result, moisture and dust that have entered the surrounding portion 24 are naturally dropped downward through the opening 25, so that moisture and dust do not accumulate inside the surrounding portion 24, and dirt and corrosion of the lamp progress due to these. Is prevented.

Here, in each of the above embodiments, the present invention is applied to the surrounding portions formed on the supporting legs and the mounting legs of the lamp body formed by resin molding. The present invention can be similarly applied to a case where a part of a vehicle lamp is resin-molded with a mold. Further, in the above-described embodiment, an example in which the projection is provided in the core mold, but even when the projection is provided in the mold, in order to obtain the effect of promoting the cooling effect of the projection, The present invention can be applied to the case where the projecting portion exists on either the core type or the mold type.

[0018]

As described above, according to the present invention, an opening for penetrating the surrounding portion to the outside is provided in a part of the wall defining the surrounding portion formed in the lamp body of the vehicle lighting device. Therefore, the projecting portion of the mold for molding the surrounding portion is in a state of being directly in contact with the outer mold through the opening, and the heat generated in the projecting portion can be radiated to the outer mold through the opening. In addition, it is possible to enhance the cooling effect of the protruding portion, shorten the cooling time of the lamp body, and improve the working efficiency of resin molding.

[Brief description of the drawings]

FIG. 1 is a front view of a lamp using a resin lamp body of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view of the lamp body of FIG. 1 as viewed from the back.

FIG. 4 is a sectional view of a main part of a mold structure according to the present invention.

FIG. 5 is a perspective view of a lamp body according to a second embodiment of the present invention as viewed from the rear.

FIG. 6 is a sectional view of a main part of a mold structure according to a second embodiment of the present invention.

FIG. 7 is a perspective view of a lamp body provided with a conventional surrounding portion as viewed from the back.

8 is a sectional view of a part of a mold structure for resin-molding the lamp body of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lamp body 2 Lens 3 Reflector 6 Aiming adjustment mechanism 7 Support leg part 8 Mounting leg part 12 Vertical aiming adjustment part 16 Aiming adjustment rod 21, 21A Leg piece 22 End wall 23 Reinforcement wall 24 Surrounding part 25 Opening 100 Cab type (movable 101) Core type (fixed type) 103 Projection part 105 Slide core 110 Ejector pin

Claims (6)

[Claims] 1. A main body of a lamp body formed in a container shape, a leg protruding from a rear surface of the main body, and a reinforcing wall erected along both sides of the leg. The leg piece and the reinforcing wall are formed of resin integrally with the main body, a surrounding portion is formed between the leg piece and the reinforcing wall, and the leg piece is provided with an opening in the surrounding portion as desired. A vehicular lamp characterized by: 2. The vehicular lamp according to claim 1, wherein the leg is a supporting leg of an aiming rod provided on the lamp body. 3. The vehicular lamp according to claim 1, wherein the leg piece is a mounting leg for mounting the lamp body to a vehicle body. 4. The lamp body is formed by resin molding with a pair of molds, and the leg portion provided with the opening is inclined with respect to a mold releasing direction of the mold.
Any of the vehicle lamps. 5. The method according to claim 1, wherein one of the molds is provided with a protruding portion to be inserted into the surrounding portion, and the other mold is provided with one of the projecting portions. A slide core is provided so that the part can enter the opening,
A method for manufacturing a vehicular lamp, wherein resin molding is performed in a state where the part of the slider core is in contact with the protruding portion. 6. The method according to claim 4, wherein one of the molds is provided with a projecting portion which enters the surrounding portion, and the other mold is a part thereof. Wherein the resin molding is performed with the part of the other mold in contact with the protruding portion.