JPH0729015Y2 - Seal packing structure for vehicle lighting - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening provided in an exterior plate of a vehicle, a lamp housing attached to the exterior plate of the vehicle body so as to cover the opening, and an interposing between the body exterior plate and the lamp housing. Mounted annular seal packing, and a plate-like bent piece integrally provided with the seal packing,
The present invention relates to a mounting structure for a vehicular lamp, comprising: an engagement hole provided in the bent piece; and a hook fixed to a lamp housing and engaged with the engagement hole.

[0002]

2. Description of the Related Art In a vehicular lamp, such as a rear combination lamp, which comes into contact with an exterior plate of a vehicle body, a lamp housing or the like is made of a synthetic resin product, which is plated with cloth or painted. Then, a seal packing is attached to the edge portion that comes into contact with the vehicle exterior plate. This seal packing is an injection-molded soft synthetic resin or rubber molded product.

FIG. 4 is a cross-sectional view showing a conventional example of this type of vehicle lamp mounting structure.

Reference numeral 1 denotes a vehicle body exterior plate, in which the upper side is the vehicle exterior side and the lower side is the vehicle interior side.

The vehicle body exterior plate 1 is provided with an opening 1a for mounting a vehicular lamp.

Reference numeral 2 denotes a lamp housing of a vehicular lamp, and a melt groove 2a is formed around the front opening of the lamp housing.

Reference numeral 3 denotes a lens of a vehicular lamp, around which a lens leg 3a projecting rearward is integrally provided. The lens leg 3a is inserted into the melt groove 2a and adhered by a hot melt 4 which is a thermosoftening adhesive to keep airtightness and watertightness.

A socket 5 is installed by penetrating the rear opening of the lamp housing 2 and a light source bulb 6 is mounted.

The lamp housing 2 of the vehicular lamp constructed as described above is mounted so as to cover the opening 1a of the vehicle exterior plate. The lamp housing 2 is integrally provided with a seal rib 2b that is opposed to and abuts the periphery of the opening 1a and is pressed against the vehicle exterior plate 1 via an annular seal packing 7.

The seal rib 2b is a seal packing 7.
Press and compress to exert the sealing effect.

A plan view of the seal packing 7 is shown in FIG. The seal packing 7 has a structure in which a bent piece 7b is integrally connected to the side of the annular portion 7a. 7d indicated by the chain line
Is a boundary line between the annular portion 7a and the bending piece 7b, and is also a bending line of the bending piece 7b.

The seal rib 2b shown in FIG. 4 has two portions in this cross section, but has a three-dimensional cylindrical shape.
The annular portion 7a of the seal packing 7 shown in FIG. 5 is pressed and sealed.

The bending piece 7b described with reference to FIG. 5 is shown in FIG.
As shown in, it is bent to have an L-shaped cross section,
An engaging hole 7c provided in the bent piece 7b is hooked on a hook 2c provided on a side surface of the lamp housing 2.

The seal packing 7 is fixed by being sandwiched between the seal rib 2b and the vehicle body exterior plate 1, and in order to ensure this fixing, the pin 2d integrally formed with the lamp housing 2 is a seal packing 7. Stabs through. However, when the shape of the lamp housing mounting portion is narrow due to design restrictions, it may be difficult to install the pin 2d.

[0015]

As shown in FIG. 4, in the seal packing 7, the annular portion 7a described with reference to FIG. 5 is sandwiched between the seal rib 2b of the lamp housing and the vehicle exterior plate 1, and Although the bent piece 7b is bent at a substantially right angle and hooked on the hook 2c, the seal packing 7 tries to return to the flat posture due to its elasticity.

Therefore, the engaging hole 7c of the seal packing
Disengages from the hook 2c of the lamp housing and tries to restore to the flat seal packing 7a drawn by an imaginary line as shown by an arrow a.

In this way, the seal packing 7 has the hook 2
To prevent the hook 2c from coming off, it is possible to extend the hook-shaped tip portion of the hook 2c as shown in FIG. 6 to form an extended hook 2c 'shown by an imaginary line.

However, such an extended hook 2
When c'is provided, the flat plate-like seal packing (shown in phantom) 7'is bent as shown in FIG. 7 and the engaging hole 7c is hooked on the extended hook 2c '. Even if you try, you can't get caught.

Further, the size of the hook is also restricted due to technical problems related to injection molding of the lamp housing.
In addition, the shape of the hook in relation to the equipment installed around the lamp,
There may be size restrictions.

Further, as in the seal packing 7 shown in phantom in FIG. 8, the annular portion 7a is sandwiched between the seal rib 2b of the lamp housing and the vehicle body exterior plate 1, and the bent piece 7b is formed at a substantially right angle. Bent to the engagement hole 7c
When the hooks are hooked on the hook 2c, these constituent parts are subjected to vibrations during traveling to cause displacement of the annular portion of the seal packing 7, and the annular portion 7a is drawn like a seal packing 7'drawn by a solid line. There is also a risk that ′ will come off from the seal rib 2b.

As described above, the annular portion 7a is the seal rib 7
As shown in FIG. 4, a pin 2d projecting rearward from the lamp housing 2 is integrally formed with the lamp housing 2 in order to prevent it from coming off from between the a and the vehicle body exterior plate 1 and coming off. It is effective to have it.

However, the design conditions in the vicinity of the opening 1a of the vehicle body exterior plate 1 to which the lamp housing 2 is attached are quite tight, and the pin 2d cannot always be provided.
If it is unavoidable that the pin 2d is not provided, the seal packing annular portion 7a may come out and come off as described above.

Further, even if the pin 2d is partially arranged, there is a possibility that a similar problem (a protrusion of the seal packing) may occur at a place where the pin 2d cannot be arranged.

In order to prevent such problems as engagement / disengagement between the engagement hole and the hook and protrusion of the annular portion,
It is also conceivable to configure the seal packing 9 shown in FIG. 9 so that the cross section thereof has an L-shape in a free state in which no external force is applied thereto. The seal packing 9a is an annular portion, which is a similar component corresponding to the annular portion 7a of the seal packing 7 shown in FIG.

The bent piece 9b is a component corresponding to the bent piece 7b of the seal packing 7 shown in FIG. 5, but it is not formed along the same plane as the annular portion 9a, but is almost formed. It is configured to be bent at a right angle. Reference numeral 9c is an engaging hole for engaging with the hook 2c.

By using the seal packing 9 (FIG. 9) of such a tentative plan, it is possible to effectively prevent the occurrence of the above-mentioned failure such as hook disengagement and annular portion humming.

However, if a seal packing 7 having a three-dimensional shape like the trial seal packing 9 shown in FIG. 9 is to be injection-molded, the molding die becomes expensive and the molding work efficiency is high. And the manufacturing cost becomes higher.

The present invention has been made in view of the above circumstances, and there is no risk that the engaging hole will come off from the hook of the lamp housing, there will be no risk that the annular portion will come off from the seal rib, and the manufacturing cost will be high. It is an object of the present invention to provide a seal packing structure that does not become a failure.

[0029]

As a structure for achieving the above object, a seal packing structure according to the present invention is
An opening provided in an exterior plate of the vehicle, a lamp housing attached to the vehicle exterior plate covering the opening, an annular seal packing interposed between the vehicle exterior plate and the lamp housing, and the seal A vehicle including a plate-shaped bent piece that is integrally provided with the packing, an engagement hole formed in the bent piece, and a hook that is fixed to the lamp housing and engages with the engagement hole. In a structure for mounting a lighting fixture, a U-shaped groove is provided on one surface of the seal packing along a boundary line between the annular seal packing and the bent piece, and a U-shaped groove is provided in the vicinity of the groove bottom. It is characterized in that a thin portion having a substantially uniform thickness is formed.

[0030]

According to the above construction, when the bending piece is bent at about 90 degrees with respect to the annular portion of the seal packing, the seal packing is bent at the thin portion near the groove bottom of the U-shaped groove.

Moreover, since the thin portion has a uniform thickness, stress is dispersed, and local deformation and stress concentration do not occur. Therefore, there is no possibility of inducing damage to the seal packing and excellent durability. ing.

Since the bent portion is thin in this way, the elasticity of the seal packing itself tends to weaken the force for restoring the flat shape, which may cause the hook to come off and the annular portion to come out. There is no.

Further, since the seal packing according to the present invention has a flat plate shape in a free state where it is not subjected to external force, the structure of the molding die is simple, the number of man-hours for injection molding is small, and the manufacturing cost is low.

Moreover, the seal packing according to the present invention can easily provide compatibility with the seal packing of the conventional example, and can be applied without changing the vehicle body exterior plate and the lamp housing of the conventional example. , Even more practical.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a seal packing structure 1 according to the present invention.
It is sectional drawing of the vehicle lamp provided with the Example.

This embodiment is obtained by applying the present invention to the conventional example shown in FIG. 4, and is improved. The vehicle exterior plate 1, the opening 1a, the lamp housing having the same reference numerals as those in FIG. 4 are attached. 2, melt groove 2a, seal rib 2b, hook 2
The lens c, the lens 3, the lens leg 3a, the hot melt 4, the socket 5, and the light source bulb 6 are the same or similar components as in the conventional example (FIG. 4).

Reference numeral 8 is a seal packing formed by applying the present invention, the engaging hole 8c of which is hooked on the hook 2c, and the portion C is bent at a substantially right angle.

The seal packing 8 according to this embodiment described above.
A plan view of is shown in FIG. This drawing corresponds to FIG. 5, which is a plan view of the seal packing 7 in the conventional example.

Reference numeral 8a denotes an annular portion, which is a similar component corresponding to the annular portion 7a in the conventional example.

Reference numeral 8b is a bent piece, which is a similar component corresponding to the bent piece 7b in the conventional example.

Reference numeral 8c is an engaging hole, which is a similar component corresponding to the engaging hole 7c in the conventional example.

A U-shaped groove 8d is formed along the boundary line between the annular portion 8a and the bent piece 8b which is integrally formed with the annular portion 8a.
Is provided.

FIG. 3A is a schematic enlarged cross-sectional view of the cross section DD shown in FIG. 2 above, in which one U-shaped groove 8d is provided on one side of the seal packing 8. ing.

The standard thickness dimension of this seal packing 8 is T
However, in the vicinity of the groove bottom of the U-shaped groove 8d, the section L has a uniform thickness dimension t.

Therefore, when the bent piece 8b of the seal packing 8 is bent with respect to the annular portion 8a, it is bent at the portion of the thickness dimension t as shown in FIGS. It has an outer shape and is elastically deformed as shown in FIG.

The portion C surrounded by an imaginary line in FIG. 1 and (C) in the schematic view shown in FIG. 3 correspond to each other.

When the seal packing 8 is elastically deformed and bent as described above, since the portion that is actually deformed is a thin thickness t of t <T, the restoring force due to the elastic force is small. There is no possibility that the engaging hole 8c shown in FIG. 1 will come off from the hook 2c, and there will be no problem that the sandwiched portion by the seal rib 2b will come out and come off.

Further, the portion of the section L is uniformly curved, and there is no possibility that a large strain is locally generated or a stress concentration is locally generated, and an appropriate roundness is obtained on the outer peripheral surface. Therefore, the appearance is good and the commercial value is high.

[0049]

As described above, the opening provided in the vehicle exterior plate, the lamp housing attached to the vehicle exterior plate covering the opening, and the lamp housing interposed between the vehicle exterior plate and the lamp housing. Mounted annular seal packing, a plate-shaped bent piece integrally connected to the seal packing, an engagement hole provided in the bent piece, and the engagement hole fixed to the lamp housing. The present invention is applied to a mounting structure of a vehicular lamp including a hook that engages with a hook, and a U-shaped groove is formed in the seal packing along a boundary line between the annular seal packing and the bent piece. With the provision of the above, there is no risk that the seal packing will come off from the hook of the lamp housing, and there is no risk that the seal packing will come off between the seal rib and the vehicle body exterior plate.

Moreover, since the seal packing according to the present invention has a simple structure in which the U-shaped groove is provided in the conventional seal packing, the increase in parts cost is negligible.

Furthermore, since the seal packing according to the present invention has only a U-shaped groove as compared with the seal packing of the conventional example, the present invention can be applied without modifying a ready-made lamp housing. The seal packing of the present invention is compatible with the conventional seal packing.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a vehicular lamp having a seal packing structure according to an embodiment of the present invention.

FIG. 2 is a plan view of a seal packing in the above embodiment.

FIG. 3 is an explanatory diagram of actions and effects of the above-described embodiment.

FIG. 4 is a vertical sectional view of a conventional vehicle lamp.

FIG. 5 is a plan view of a seal packing in the conventional example.

FIG. 6 is an explanatory diagram of a defect in the conventional example.

FIG. 7 is an explanatory diagram of a defect in the conventional example.

FIG. 8 is an explanatory diagram of a problem in the conventional example.

FIG. 9 is an explanatory diagram regarding a defect of the conventional technique.

[Explanation of symbols]

 1 Lamp housing 1a Opening 2 Lamp housing 2a Melt groove 2b Seal rib 2c Hook 2d Pin 3 Lens 3a Lens leg 4 Hot melt 5 Socket 6 Light source bulb 7 Seal packing 7a Annular part 7b Bending piece 7c Engagement hole 7d Bending curve 8 Seal packing 8a Annular part 8b Bending piece 8c Engagement hole 8d U-shaped groove

Claims (1)

[Scope of utility model registration request] 1. An opening provided in an exterior plate of a vehicle, a lamp housing mounted on the exterior plate of the vehicle body to cover the opening, and an annular seal interposed between the exterior plate of the vehicle body and the lamp housing. A packing, a plate-shaped bent piece that is integrally provided with the seal packing, an engagement hole provided in the bent piece, and a hook that is fixed to the lamp housing and engages with the engagement hole. And a U-shaped groove is provided on one surface of the seal packing along a boundary line between the annular seal packing and the bent piece. A seal packing structure for a vehicular lamp, characterized in that a thin-walled portion having a substantially uniform thickness is formed near the groove bottom.