JP2001067907A - Lighting fixture for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture for a vehicle which has a good sealing function, facilitates mounting work of a lens and a housing and allows an easy sorted recovery. SOLUTION: A housing 12 that has a front aperture part provided with a seal groove 16 on a peripheral edge thereof, a light transmissive member that covers the front aperture part of the housing 12 and has a leg corresponding to the seal groove 16 are mounted on a lighting fixture for a vehicle via a seal packing 18. The lighting fixture for a vehicle is structured to comprise the seal groove 16 is formed in a recessed section shape having an inner width W and is opened toward front side at an outer peripheral edge, the seal packing 18 has a width WS corresponding to the inner width W of the seal groove 16 of 1.1×W-1.3×W, and has almost 1.50 to 1.75 kg/cm2 repulsive force when it is pressed in a range of 30-70%, and the light transmissive member and the housing 12 are fixed under such a condition that a seal leg of the light transmissive member is brought into pressure contact with the seal packing 18 provided in the seal groove 16 with not less than 1.50 kg/cm2 repulsive force as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination light such as a headlight, a rear light and a fog lamp of a vehicle such as an automobile, and more particularly to a structure for fixing a seal between a housing and a lens.

[0002]

2. Description of the Related Art Hitherto, in a vehicular lamp such as an automobile, a structure in which an outer lens is bonded to a housing by hot melt and fixed by sealing is widely adopted. For example, FIG. 6 shows two lamp rooms 91a and 91b.
FIG. 1 is a cross-sectional view of a rear combination lamp 90 in which a plurality of lamp chambers 91a,
Incandescent lamps 95a and 95b are provided corresponding to 91b. An inner lens 93 and an outer lens 94 are provided in the front opening of the housing 92, and are colored and lens-cut according to each of the lamp chambers 91a and 91b to obtain a desired color and light distribution characteristics. It has been like that.
At this time, the inner lens 93 is fixed to the housing by a socket structure or the like, and the outer lens 94 is formed by a hot melt 98 applied in a seal groove 96 on the outer peripheral edge of the housing in order to keep the vehicle lamp 90 airtight. The sealing foot 97 of the lens 94 is bonded and fixed.

[0003]

By the way, there has been a demand for a structure which can be separated and collected because of recent increase in environmental problems. For example, in the above-described vehicular lamp, ABS resin or the like is used for the housing 92, and acrylic resin or the like having high transparency is often used for the inner lens 93 and the outer lens 94, and a hot melt 98 is used. In the fixed structure of the lens and the housing,
Separation and collection are not easy because both are strongly adhered.
Further, a structure in which the lens and the housing are hermetically fixed by welding is often used, but also in this case, it is not easy to separate and collect similarly.

Therefore, it is conceivable that the lens and the housing are bonded and fixed with a foam sealant or fixed via a packing material. However, in the former case, the cost is high, and in the latter case, the contact point between the lens and the housing is high. In this structure, a packing material is merely provided, and there are problems in terms of sealing properties, workability in mounting, and the like. In particular, when a packing material is provided in the seal groove 96 to fix the sealing foot 97 of the acrylic resin lens, the sealing material is displaced by the sealing foot 97 to make the sealing performance non-uniform, The stress was generated, and the defect that the lens 94 was broken occurred.

In view of the above, it is an object of the present invention to provide a vehicular lamp which has a good sealing function, is easy to attach a lens and a housing, can be stably assembled, and is easily separated and collected. It is an object.

[0006]

SUMMARY OF THE INVENTION According to an aspect of the present invention, there is provided a housing having an opening at a front side and having a seal groove at a peripheral edge thereof, and a cover for covering the front opening of the housing. In a vehicular lamp in which a translucent member having a sealing foot corresponding to the groove is attached via a seal packing, the seal groove has an internal width W that opens forward on the outer peripheral edge of the housing opening. The seal packing has an inner width W of the seal groove.
When the seal WS has a width WS of 1.1 × W to 1.3 × W and the seal packing is compressed by 30 to 70%, the width WS is approximately 1.50 to 1.5 × W.
The translucent member and the housing have a repulsive force of 1.75 Kg / cm ² , and the translucent member and the housing have a seal packing in which the seal foot of the translucent member is provided in the seal groove over substantially the entire surface.
This is achieved by providing a vehicular lamp that is pressed against and fixed in a state having a repulsive force of 50 kg / cm ² or more.

According to this aspect, the vehicle lamp is effectively sealed, and the work of attaching the lens to the housing is easy, the assembly can be performed while maintaining a stable sealing performance, and the separation and collection are easy. A vehicular lamp can be provided.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS.
These illustrate one embodiment of a vehicle lamp of the present invention, and reference numeral 10 denotes a vehicle lamp. FIG. 1 is a partially omitted cross-sectional view for explaining a mounting operation state of the outer lens 15 in the vehicle lamp 10. A light source 13 made of an incandescent light bulb is arranged at the center of the rear part of the housing 12, and an inner lens 14 and an outer lens 15 are attached to a front opening of the housing 12.
A light chamber 11 is formed for irradiating the irradiating light from the camera with a desired color and light distribution characteristics.

Although the configuration up to this point is the same as that of the conventional vehicle lamp, the vehicle lamp 10 according to the present embodiment has a seal groove 16 provided on the entire peripheral edge of the front opening of the housing 12. Seal packing 1 made of columnar string rubber
The seal foot 17 of the outer lens comes into contact with the seal packing 18 and the seal foot 18 is pressed and fixed by the seal foot 17.

FIG. 2 shows the seal packing 1 in the seal groove 16.
FIG. 3 is a plan view of the housing 12 where the housing 8 is disposed, as viewed from the front opening side. FIG. 3 shows a portion of a seal groove 16 for explaining a mounting state between the seal foot 17 of the outer lens 15 and the housing 12. FIG. 4 is an enlarged schematic cross-sectional view.
FIG. 3 is an enlarged sectional view showing the seal packing 18.

Here, the sealing groove 16 has an outer standing wall 16a and an inner standing wall 16b so that the cross-sectional shape is concave, and the gap, that is, the width is W and the depth is D, and the ABS together with the housing main body is ABS. It is integrally formed of resin or the like. Further, an appropriate number of hook holes 16c are provided in the upright wall 16a on the outer periphery of the housing, and the hooks 17a formed on the sealing feet 17 are engaged with the hook holes 16c to fix the lens. The hook hole 16c may be formed on the inner standing wall 16b side.
The shape may be a U-shape or a groove. In other words, another known structure may be used as long as the lens foot 17 and the seal groove 16 can be fixed by a hook structure.

The seal packing 18 is made of an international rubber hardness IR.
HD (International Rubber Hardness Degree, hereinafter I
A material whose RHD is softer than 30 is preferable from the viewpoint of sealing properties. For example, ethylene-propylene rubber (eth
EPDM (ethylene-propylene rubber)
Propylene / diene terpolymer) and the like. Further, the outer diameter WS of the packing 18 is about 1.2 times larger than the seal groove width W, and when the packing 18 is fitted into the seal groove, the packing 18 does not easily fall off in the seal groove 16. Like that.

Further, as shown in FIG.
If the seal 8 is provided with a thin adhesive layer 18b around the packing body 18a, when the packing 18 is mounted in the seal groove 16, the packing 18 does not drop off further.
In the case where the adhesive layer 18b is not provided, when the seal foot is pressed and fixed, the packing 18 is displaced to the left or right in the seal groove due to the press contact of the seal foot 17, and is eccentrically fixed to one of the upright walls. However, the provision of the adhesive layer prevents eccentricity. The adhesive layer 18b can be formed by applying a mixed solution of a hexane liquid and a butyl sealant, and a volatile substance is preferable in terms of workability and the like.

In the present embodiment, a cord having a circular cross section is drawn around and fitted into the seal groove 16 while conforming to the shape of the housing 12 as shown in FIG.
A gap 19 is provided between the tips. At this time, the distance G of the gap 19 is smaller than the seal packing outer diameter WS, preferably smaller than WS × １ ／, and is most preferably 2 mm or less. If the value is larger than WS × ３, the amount of water intrusion increases, which is not preferable for practical use. In addition, the position is a position that is below when the vehicle lamp is mounted on the vehicle body. At this time, since the gap 19 is open, the airtightness of the vehicular lamp 10 is slightly reduced. However, since the gap 19 forms a maze structure that also functions as an air hole and a drain hole of the lamp, There is no practical problem. At this time, a drain hole may be provided at a position at the lowermost end of the housing 12 attached to the vehicle.

In the present embodiment, when the seal packing 18 is pressed and fixed between the outer lens 15 and the housing 12, the packing 18
It has a repulsive force in the range of 1.75 kg / cm ² . By setting the ratio within this range, a vehicular lamp having excellent sealing properties and durability can be obtained.

The outer diameter WS of the seal packing 18 is about 50%
A shower test using a high-pressure water washing machine for a vehicle was performed on a vehicle lamp in which the outer lens 15 was fixed to the housing 12 so as to be compressed. If the repulsive force in the seal packing of the same size was used as less than 1.50 kg / cm ^2, although there are cases where water enters into the lamp chamber 11, if 1.50 kg / cm ² or more of ,
Almost no moisture penetrated. Conversely, 1.75kg repulsion
If it is larger than / cm ^{2, the} stress on the outer lens 15 increases significantly, which is not preferable. In particular, when the repulsion is set to be larger than 1.90 kg / cm ² ,
Poor chemical durability due to chemicals used for cleaning vehicles, etc., and the frequency of occurrence of cracks on the outer lens surface has increased.
Therefore, it is preferable that the repulsive force be in the range of the above condition over the entire vehicle lamp.

The outer lens 15 is provided on the outermost side of the vehicular lamp 10 and has a shape covering the front opening of the housing 12. On the side, a sealing foot 17 whose length direction is substantially perpendicular to the bottom of the sealing groove 16
Is formed, and the seal foot 17 is fitted and fixed in the seal groove. Further, a hook projection 17a is formed at a position corresponding to the hook hole 16c provided on the outer peripheral portion of the housing, and the hook projection 17a and the hook hole 16c are formed with the tip of the seal foot 17 pressed against the seal packing. It is fixed to the housing by a hook structure that locks.

When the vehicular lamp 10 is, for example, a rear combination lamp having a wraparound portion to the side of the vehicle body, it is difficult for the seal packing 18 to follow the wraparound shape of the housing at the wraparound portion. It will be in a raised state. When the outer lens 15 is lifted, the seal foot 18 cannot be satisfactorily pressed against the seal packing 18 at the wraparound portion when the outer lens 15 is attached. As a result, the seal packing 18 enters the side surface, that is, between the seal foot 17 and the standing wall 16a or 16b, and is not properly pressed at the tip of the seal foot 17. In such a case, it is easy for moisture to enter the lamp chamber 11 from an inappropriately compressed state.

However, the outer diameter WS of the seal packing is set to 1.
By setting it in the range of 1 × W to 1.3 × W, it is possible to reduce the floating of the seal packing 18 and realize a good pressure contact state. Further, by providing the above-mentioned adhesive layer 18b on the seal packing 18, it was possible to more effectively reduce the floating in the wraparound portion. In addition, instead of providing the adhesive layer 18b on the packing body 18a, as shown in FIG.
May be formed in advance.

Outer lens 1 for housing 12
For mounting 5, the seal packing 18 may be fixed in a state where the seal packing 18 is compressed by about 30 to 70%, and most preferably 50%, over almost the entirety. 1.50 to 1.1 with approximately 50% compression.
Using the seal packing 18 having a repulsive force in the range of 75 kg / cm ² , the above-described shower test was performed by attaching a lens while changing the compression ratio. Approximately 30% compression ratio
If it is smaller, the light room 11
The degree of infiltration into the inside became remarkable and was not practical. Conversely, when the compression ratio was set to be greater than 70%, the stress generated in the outer lens 15 increased, resulting in poor durability.

In particular, when an outer lens molded using an acrylic resin is used, 1.9 kg / cm ²
When a stronger force is applied to the outer lens side, the frequency of occurrence of cracks on the outer lens surface from the seal groove 16 is significantly increased by a chemical durability test using a chemical such as a cleaning agent for vehicles. Therefore, the compression ratio is approximately 30-70%,
Preferably, it is 40 to 60%, and more preferably, approximately 50%.

Incidentally, in a place where moisture easily enters, such as a wraparound portion having a large curvature, such as a rear combination lamp having a wraparound portion extending to the side of the vehicle body, the resilience is increased by increasing the compression ratio as compared with other portions. It is preferable to make it larger. For example, the compression ratio in the wraparound portion is set to approximately 6
0 to 70%, and the compression ratio in other areas is approximately 30 to 60%.
It is better to fix it as%.

The inner lens 14 has an appropriate lens cut such as a fisheye lens, and is fixed inside the front opening of the housing 12 by an appropriate means such as a hook structure. Further, a lens cut may be formed on one or both of the inner lens 14 and the outer lens 15 or the inner lens 14 may be omitted. Also, the outer lens may be a simple cover without any lens cut.

According to the vehicle lamp 10 having the above-described configuration, when the outer lens 15 is fixed to the housing 12, the seal packing 18 fitted in the seal groove 16.
Does not fall off or shift, and can easily fit into a three-dimensional curved surface shape. In particular, a string-shaped seal packing, and the seal groove 16 and the seal packing 1 are used.
Since the pressure-sensitive adhesive layer 18b is provided between the light-emitting device 8 and the light-emitting device 8, there is no twisting, and the floating can be effectively reduced even at the side of the lamp where the seal packing often floats. In addition, since the packing is temporarily fixed by the adhesive layer at the same time, displacement and eccentricity of the packing hardly occur in the subsequent steps, and the outer lens 15 can be securely fixed.

Further, the seal packing 18 does not have to be firmly bonded and fixed, such as hot melt or welding.
By using a non-adhesive fixing structure for a vehicle lamp using the above, the work of separating the housing from the lens becomes easy. In particular, when both are fixed by a hook structure, the hook structure can be easily separated by removing the hook structure, and the separation and collection can be performed more easily.

In the above-described embodiment, the shape of the seal packing 18 is circular in cross section. However, the present invention is not limited to this, and the outer diameter WS of the width in the fitting direction corresponding to the width W of the seal groove is one. As long as it is in the range of 0.0 × W to 1.5 × W, preferably in the range of 1.1 × W to 1.3 × W, it may have a rectangular or concave cross-sectional shape. Preferably, the width W of the seal groove is smaller than the depth D of the groove.

[0027]

EXAMPLE A seal groove 16 as shown in FIG. 3 was formed from an ABS resin on the outer peripheral edge of the housing combination side of a rear combination lamp (not shown) having a wraparound portion to the side of the vehicle body. At this time, the width W of the seal groove was 4.5 m.
m and depth D were 6 mm on average.

Next, the outer diameter WS as shown in FIG.
mm string-shaped cylindrical seal packing 18 in the groove 16,
The rear combination lamp is fitted in order from the lower side to make a circuit, and the distance G of the gap 19 between the tip portions is 1.5 m.
m. At this time, the seal packing 18
The resin used had an IRHD hardness of 10 and a rebound of 1.5 kg / cm ² when compressed by 50%. Further, on the outer periphery, a material in which volatile hexanebutyl was applied to form an adhesive layer 18b was used.

Next, the sealing foot 17 of the outer lens 15
Was fixed so that the seal packing 18 was pressed into contact therewith. At this time, hook structures 17a and 16c are provided so that the seal foot 17 is fixed in a state where the seal packing 18 is compressed at about 40 to 60%, and the tip portion of the seal foot 17 and the bottom of the seal groove 16 are provided. The outer lens 15 made of an acrylic resin is molded so that the gap between the outer lens 15 and the outer lens 15 is 2.2 mm. The length of the seal foot is adjusted so that a gap between the tip of the seal foot 17 and the bottom of the seal groove 16 is 2.0 mm at the part of the rear combination lamp that extends toward the vehicle body side.

When the above-described shower test was performed on the rear combination lamp, no water intrusion occurred. In addition, by removing the portion fixed by the hook structure, it was possible to separate and collect easily.

[0031]

As described above, according to the present invention, it is possible to easily and reliably fix the outer lens and the housing, and to provide an extremely excellent vehicle lamp with high sealing performance. Furthermore, the non-adhesive structure of the vehicle lamp, which is not a structure that is firmly bonded and fixed, such as hot melt or welding, makes it easy to separate the housing from the lens. In particular, when both are fixed by a hook structure, a vehicle lamp that can be easily separated by removing the hook structure or the like and that can separate and collect more easily can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view partially exploded and showing a mounted state of a vehicle lamp according to an embodiment of the present invention.

FIG. 2 is a plan view of the front opening side illustrating the vehicle lamp housing of FIG. 1;

FIG. 3 is a sectional view of a main part of the vehicular lamp of FIG. 1;

FIG. 4 is a cross-sectional view illustrating a seal packing of the vehicle lamp of FIG.

FIG. 5 is a sectional view of a main part showing a different embodiment of a vehicular lamp according to the present invention.

FIG. 6 is a schematic sectional view illustrating a conventional vehicular lamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vehicle lamp 11 Light room 12 Housing 13 Light source 14 Inner lens 15 Outer lens 16 Seal groove 16a, 16b Standing wall 16c Hook hole 17 Seal foot 17a Hook protrusion 18 Seal packing 18b, 30 Adhesive layer 98 Hot melt

Claims (7)

[Claims] 1. A sealing device comprising: a housing having an opening on the front side and a seal groove on a peripheral edge thereof; and a light-transmitting member covering the front opening of the housing and having a sealing foot corresponding to the seal groove. In the vehicle lighting device mounted via a packing, the seal groove has a recessed cross-sectional shape having an internal width W opened forward on an outer peripheral edge of a housing opening, and the seal gasket includes the seal groove. The width WS corresponding to the internal width W of the seal packing is 1.1 × W to 1.3 × W, and when the seal packing is compressed by 30 to 70%, approximately 1.50 to 1.75K.
It has a repulsive force of g / cm ^2, wherein the translucent member and the housing, substantially the entire surface over the seal packing sealing portion of the translucent member is provided in the sealing groove 1.50 kg / cm ² or more A vehicular lamp, wherein the vehicular lamp is fixed by being pressed against and having a repulsive force. 2. An adhesive is interposed between the seal groove and the seal packing.
4. The vehicle lighting device according to claim 1. 3. The vehicular lamp according to claim 1, wherein the seal packing is a string-like elastic material having an international rubber hardness of approximately 8 to 15. 4. The vehicular lamp according to claim 3, wherein the seal packing is made of ethylene / propylene rubber. 5. The vehicular lamp according to claim 1, wherein the translucent member is an acrylic resin. 6. A string-shaped seal packing fitted into the seal groove has a width of approximately WS × １ ／ between both ends thereof.
The vehicular lamp according to claim 3, wherein the vehicular lamp is disposed so as to have a gap equal to or smaller than the size of the vehicular lamp. 7. The vehicular lamp according to claim 1, wherein the translucent member and the housing are fixed by a hook provided on a side surface of the seal groove.