JPH0629843Y2 - Vehicle lighting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a vehicular lamp such as a fog lamp of an automobile.

<< Prior Art >> Conventionally, as shown in FIG. 5 and FIG. 6, a light bulb 4 is arranged in a lamp chamber 3 defined by a housing 1 and a lens 2, and the wall of the housing 1 is provided with holes. An annular fitting groove 7 formed on the outer peripheral surface of the rubber grommet 6 is fitted in the peripheral portion of the fitting hole 5 provided, and the harness 8 is externally attached to the housing 1 through the grommet 6. A vehicular lamp 9 adapted to be pulled out is known.

<< Problems to be Solved by the Invention >> In such a conventional vehicular lamp 9, the temperature inside the lamp chamber 3 rises due to the heat generated by the lighting of the light bulb 4.
When the pressure increases, the pressure acts in a direction to compress the grommet 6 in the radial direction as indicated by an arrow in FIG. 7, so that the fitting groove 7 of the grommet 6 and the fitting hole 5 of the housing 1 The adhesiveness with the peripheral edge of the lamp chamber 3 is lowered, and water leaks into the lamp chamber 3 easily occur.

In order to prevent this leak, the grommet 6 is conventionally used.
It is necessary to bond the outer peripheral portion of the housing to the wall of the housing 1, thus increasing man-hours and costs. Further, the grommet 6 is solid and has relatively low flexibility, and it is necessary to bend the grommet 6 with a strong force at the time of assembly, resulting in poor workability.

The present invention has been made in view of the above circumstances, and is capable of reliably preventing leakage between the grommet and the housing, but does not require bonding work, which reduces man-hours and costs, and further, the flexibility of the grommet. It is an object of the present invention to provide a vehicular lamp which has a high working efficiency and has a good workability when mounted on a housing.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides a light bulb in a lamp chamber defined by a housing and a lens, and a fitting provided in a wall of the housing. In the vehicular lamp in which the annular fitting groove formed on the outer peripheral surface of the rubber grommet is fitted to the peripheral edge of the fitting hole, and the harness or the like is pulled out to the outside of the housing through the grommet, Inside the grommet, a hollow portion is provided on the side opposite to the lighting chamber from the fitting groove, and a ventilation hole that connects the hollow portion and the inside of the lamp chamber is provided in the grommet, and the fitting of the grommet is performed. A flange which is in close contact with the inner surface of the housing is integrally formed on the outer peripheral surface on the lamp chamber side of the groove.

<< Operation >> When a light bulb is turned on, the heat generated from the light bulb raises the temperature in the lamp chamber, which increases the pressure. The pressure inside the lamp chamber pushes the side wall of the grommet chamber. The grommet flange pushes the wall of the housing from the inside of the lamp chamber, and the hollow portion pushes the wall of the housing from the outside of the lamp chamber. Furthermore, the hollow part expands when the pressure in the lamp chamber rises,
The grommet is pressed over the entire periphery of the fitting hole of the housing. Further, since the grommet has the hollow portion inside, the grommet has increased flexibility and is easily set in the housing.

<< Embodiment >> An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a front view of a vehicular lamp according to the present invention, FIG. 2 is a cutaway plan view of the same portion, and in both drawings, 10 is a vehicular lamp according to the present invention as a fog lamp for an automobile, which is a housing. A lamp room 13 defined by 11 and a lens 12.
An electric bulb (not shown) is provided inside, and an annular fitting groove 16 formed on the outer peripheral surface of the rubber grommet 15 is provided at the peripheral edge of the fitting hole 14 formed in the wall of the housing 11.
Is fitted and the harness 20 is inserted through the grommet 15.
Etc. are drawn out of the housing 11.

As shown in FIG. 3 and FIG. 4, the grommet 15 has an annular hollow portion 17 located inside the fitting groove 16 on the side opposite to the light chamber 13 (outside the outer surface of the wall of the housing 11).
Is provided.

The hollow portion 17 has an outer diameter larger than the fitting hole 14 and an inner diameter smaller than the fitting hole 14.

Further, the grommet 15 is provided with a plurality (four in this embodiment) of vent holes 18 which are evenly arranged in the circumferential direction. The hollow portion 17 and the lamp chamber 13 are communicated with each other through these ventilation holes 18.

Further, from the fitting groove 16 of the grommet 15 to the lamp chamber 13
A flange 19 is formed integrally with the side outer peripheral surface so as to be in close contact with the inner surface of the wall of the housing 11. Grommet 1
The harness 20 is pulled out to the outside of the housing 11 via 5.

When the light bulb is turned on, the heat generated by the light bulb causes the light chamber 1
The temperature in 3 rises and its pressure rises. This light room 13
The pressure of the grommet 1 is as shown by the arrow in FIG.
Act on 5. That is, the light chamber 1 of the grommet 15
The wall portion including the flange 19 located inside 3 is pressed against the inner surface of the wall of the housing 11 by the pressure inside the lamp chamber 13. Further, the pressure in the lamp chamber 13 acts on the inside of the hollow portion 17 through the ventilation hole 18, and the hollow portion 17 expands.

As a result, the wall portion of the grommet 15 located outside the lamp chamber 13 is pressed against the outer surface of the wall of the housing 11 by the pressure of the lamp chamber 13. Therefore, both side surfaces of the fitting groove 16 of the grommet 15 are in close contact with the inner and outer surfaces of the wall of the housing 11 over the entire circumference, and the flange 19 of the grommet 15 is formed on the wall of the housing 11 over the entire circumference. It adheres to the inner surface and prevents leakage between them.

<Effects of the Invention> As described above, the present invention provides the inside of the grommet with the hollow portion located on the side opposite to the lamp chamber from the fitting groove, and
The grommet is provided with a ventilation hole that communicates between the hollow portion and the interior of the lamp chamber, and a flange that is in close contact with the inner surface of the housing is integrally formed on the outer peripheral surface on the lamp chamber side of the fitting groove of the grommet. Since the pressure increases due to the temperature increase in the lamp chamber due to the lighting, the both side surfaces of the fitting groove of the grommet and the flange are surely brought into close contact with the wall of the housing over the entire circumference, so that the leak therebetween can be reliably prevented. Also,
Since the adhesion between the grommet and the housing is high, the work of adhering the grommet to the housing is unnecessary, and the number of steps and cost can be reduced. Further, the grommet has a high flexibility due to the hollow portion inside thereof, so that it can be easily assembled into the housing and has good workability.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a front view of a vehicular lamp according to the present invention, FIG. 2 is a cutaway plan view of the same portion, and FIG. FIG. 4 is an enlarged view of the grommet portion, FIG. 4 is a view in the direction of arrow IV in FIG. 3, FIG. 5 is a partially cutaway perspective view of a conventional vehicle lamp, FIG. 6 is a cross-sectional view of the same, and FIG. It is an expanded sectional view of the grommet part of a figure. 10 ... Lamp, 11 ... Housing, 12 ... Lens, 13 ... Lamp chamber, 14 ... Fitting hole, 15 ... Grommet, 16 ... Fitting groove, 17 ... Hollow part, 18 ... Through Pore, 19 ... Flange, 20 ... Harness.

Claims (1)

[Scope of utility model registration request] 1. A light bulb is arranged in a lamp chamber defined by a housing and a lens, and is formed on an outer peripheral surface of a rubber grommet at a peripheral edge portion of a fitting hole formed in a wall of the housing. In a vehicle lamp in which a ring-shaped fitting groove is fitted and a harness or the like is pulled out to the outside of the housing through the grommet, a position inside the grommet and on a side opposite to the lighting chamber from the fitting groove is provided. A hollow portion is provided, and a ventilation hole that communicates the hollow portion and the interior of the lamp chamber is provided in the grommet, and the grommet is in close contact with the outer peripheral surface on the lamp chamber side from the fitting groove and the inner surface of the housing. A vehicular lamp having a flange integrally formed.