JP2011243292A - Heat shielding structure of lighting fixture for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat shielding structure of a lighting fixture for a vehicle, capable of enhancing heat radiation inside a lamp chamber to secure high heat resistance and improving an appearance of the lighting fixture for a vehicle.SOLUTION: In the heat shielding structure 1 of a lighting fixture for a vehicle provided with at least a bulb 5 housed in a lamp chamber 4 demarcated by a housing 2 and a lens 3 covering the opening of the housing 2 and a heat escaping hole 2b formed at an upper position of the bulb 5 in the housing 2, a heat shielding plate 7 is placed to cover the heat escaping hole 2b formed in the housing 2 from the outside of the housing 2. Then, a rib 2c is formed in the housing 2 to fix the heat shielding plate 7 by inserting a part of the heat shielding plate 7 into the rib 2c. Further, the same coating as the housing coating is applied on the heat shielding plate 7 or a silver plated steel plate having a similar color as the color of the housing coating is used as the heat shielding plate 7.

Description

  The present invention relates to a heat insulating structure for a vehicular lamp in which a heat escape hole is formed at a position above a valve of a housing.

  An example of a vehicular lamp is shown in the side cross section of FIG. 6, but the illustrated vehicular lamp 101 includes a bulb 105 in a lamp chamber 104 defined by a housing 102 and an outer lens 103 that covers the opening. The inner surface of the housing 102 is provided with a silver coating for reflection, and the inner surface is used as a reflection surface. Further, the heat resistance distance from the bulb 105 is secured so that the housing 102 is not deformed or melted by the heat generated from the bulb 105 when the lamp is lit.

  However, in a vehicular lamp that employs a seal structure that is sealed with a packing between the vehicle body and a waterproof structure, it may not be possible to ensure a necessary and sufficient heat-resistant distance due to restrictions on the vehicle body design. As shown in FIG. 7, a heat escape hole 102b is formed at a position above the valve 105 of the housing 102, and heat generated from the valve 105 is released from the heat escape hole 102b so as to suppress the temperature rise in the lamp chamber 104. Yes. Alternatively, as shown in FIG. 8, a heat shield plate 107 is disposed above the valve 105 inside the housing 102 so as to be separated from the inner surface of the housing 102, and heat generated from the valve 105 is blocked by the heat shield plate 107. The heat resistance of the housing 102 is increased.

  By the way, in Patent Document 1, even if the material of the heat shield plate is not an almost complete elastic body, the heat shield plate is formed by forming a triangular hook that engages with the engagement hole of the housing on the heat shield plate. An attachment structure that can be securely attached to a housing has been proposed.

  Further, in Patent Document 2, a heat shield plate is disposed in a lamp unit so as to be spaced apart from the lamp unit, and a vent hole is provided on the back surface of the lamp body (housing) so that the lamp unit is heated by the heat when the light source is turned on. There has been proposed a vehicular lamp that prevents thermal deformation of the vehicle.

  Further, in Patent Document 3, in a vehicular lamp provided with a heat shield plate on the upper side of the housing, the reflected light from the heat shield plate reaches the lower side of the housing to increase the temperature, and the portion is thermally deformed. In order to solve this problem, proposals have been made to devise the shape of the heat shield. Specifically, an approximately isosceles triangular prism-shaped convex portion with the apex positioned on the vertical line is provided above the vertical line passing through the light source of the heat shield plate in the direction along the optical axis, and the height of the ridge line of the convex portion is increased. A configuration has been proposed in which the height is lowered toward the back of the vehicular lamp.

No. 7-039131 JP-A-4-260843 JP-A-7-134903

  However, in the configuration in which the heat release hole 102b is formed above the valve 105 of the housing 102 as shown in FIG. 7, the outer lens 103 is transparent, or the outer lens 103 has a lens cut for appearance and light distribution. Is large, there is a problem that the space on the back side of the housing 102 looks black from the heat escape hole 102b, and the appearance of the vehicle is impaired. In particular, the heat release hole 102b becomes conspicuous when the mold release direction during molding of the housing 102 is swung up and down.

  In addition, when a configuration in which the heat shield plate 107 is disposed above the inside of the housing 102 as shown in FIG. 8 is arranged away from the inner surface of the housing 102, the mounting structure of the heat shield plate 107 is configured inside the housing 102. Therefore, there is a problem that the heat shield plate 107, its holding portion, gaps, and the like are visible through the outer lens 103, so that it does not look good.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to improve the external appearance of a vehicle lamp while ensuring high heat resistance for the vehicle lamp by increasing the heat dissipation in the lamp chamber. An object of the present invention is to provide a heat insulating structure for a vehicular lamp.

  In order to achieve the above object, according to a first aspect of the present invention, at least a bulb is housed in a lamp chamber defined by a housing and a lens covering the opening, and a heat escape hole is formed at a position above the bulb of the housing. As a heat shield structure for a vehicular lamp, a heat shield plate that covers the heat release hole formed in the housing from the outside of the housing is provided.

  According to a second aspect of the present invention, in the first aspect of the present invention, a rib is formed on the housing, a latching portion is formed on the heat shield plate, and the rib is inserted into the latching portion to thereby form the heat shield plate. Is fixed to the housing.

  A third aspect of the invention is characterized in that, in the first or second aspect of the invention, the heat shield plate is configured in a step shape.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, an exhaust hole that opens upward of the lens is formed in the heat shield plate.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the heat shield plate is coated with the same coating as the housing coating, or a silver-plated steel plate close to the housing paint color is used as the heat shield plate. It is characterized by using.

  According to the first aspect of the present invention, since the heat escape hole formed in the housing is covered with the heat shield plate from the outside of the housing, the outer lens is transparent, or the outer lens is inserted for appearance and light distribution. Even if the lens cut is large, the space on the back side of the housing is not seen from the heat escape hole, and the appearance of the vehicular lamp is enhanced. And since a comparatively large heat escape hole can be formed without impairing the appearance, the housing part which is a problem in terms of heat resistance can be deleted to make a heat escape hole, and the housing and the valve are arranged close to each other. It becomes possible to correspond to the body design. Further, since the heat shield plate is arranged outside the housing, the structure for fixing the heat shield plate to the housing can be arranged at a position where it cannot be seen from the outside, and in this case, the heat shield plate is divided by the area of the heat release hole. The appearance of the vehicular lamp is enhanced because only the sight is visible and not the whole.

  In addition, since heat generated from the bulb is discharged from the heat escape hole to the outside of the housing, heat dissipation is improved, and temperature rise in the lamp chamber is suppressed, so that heat resistance of the vehicular lamp is improved. In this case, since the heat shield plate which is heated is arranged outside the housing, the heat dissipation performance (cooling performance) of the heat shield plate is improved, and the temperature rise of the heat shield plate itself is suppressed. The durability of the housing is enhanced by reducing the influence of the heat on the housing.

  According to the second aspect of the present invention, the engaging portion is formed on the heat shield plate, and the rib formed on the housing is inserted into the engaging portion to fix the heat shield plate to the housing. The heat shield can be easily attached to the housing by the attachment structure.

  According to the invention described in claim 3, since the heat shield plate is configured in a step shape, it becomes possible to increase the gap between the heat shield plate and the heat release hole of the housing without impairing the appearance of the vehicular lamp. Since heat is efficiently discharged from the large gap to the outside of the housing, heat dissipation is enhanced and higher durability is ensured for the vehicular lamp.

  According to the fourth aspect of the present invention, since the exhaust hole that opens toward the upper side of the lens is formed in the heat shield plate, the exhaust hole is not visible from the outside, and the heat from the exhaust hole is not impaired without deteriorating the appearance of the vehicular lamp. Can be efficiently discharged out of the housing. And the heat dissipation of a heat shield is improved, and higher durability is ensured for the vehicular lamp.

  According to the invention described in claim 5, since the heat shield plate is coated with the same coating as the housing paint or a silver-plated steel plate close to the housing paint color is used as the heat shield plate, the heat escape hole is made inconspicuous. The appearance of the vehicular lamp can be improved. Further, the heat shield plate can function as a reflecting plate in the same manner as the inner surface of the housing, and the amount of light emitted from the vehicular lamp is increased to increase the illuminance.

It is a sectional side view of the vehicle lamp provided with the heat insulation structure which concerns on this invention. It is a fragmentary perspective view which shows the attachment structure of the heat insulation board of the vehicle lamp provided with the heat insulation structure which concerns on this invention. (A) is a fragmentary perspective view which shows another form of the attachment structure of the heat insulation board of the vehicle lamp provided with the heat insulation structure concerning this invention, (b) is the sectional view on the AA line of (a). (A) is a fragmentary sectional view of the vehicular lamp which shows another form of the heat insulation structure concerning this invention, (b) is a perspective view of a heat insulation plate. (A) is a fragmentary sectional view of the vehicular lamp which shows another form of the heat insulation structure concerning this invention, (b) is a perspective view of a heat insulation plate. It is a sectional side view of the conventional vehicle lamp. It is a sectional side view of the vehicular lamp which shows the conventional heat insulation structure. It is a sectional side view of the vehicular lamp which shows the conventional heat insulation structure.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a side sectional view of a vehicular lamp having a heat shield structure according to the present invention, and FIG. 2 is a partial perspective view showing a fixing structure of a heat shield plate.

  A vehicular lamp 1 shown in FIG. 1 is a back lamp disposed on the left and right of a rear portion of a vehicle, and is defined by a housing 2 integrally formed of resin and an outer lens 3 made of a transparent resin that covers an opening thereof. A bulb 5 as a light source is housed in the lamp chamber 4. The vehicular lamp 1 has a design in which the bulb 5 and the housing 2 are arranged close to each other (at an interval at which there is a possibility of causing a heat-resistant problem). It is deleted as 2b.

  The inner surface of the housing 2 is coated with a high reflectance as a reflection treatment, and the housing 2 also functions as a reflector. The socket 6 of the valve 5 is inserted and held in the insertion hole 2 a formed in the center of the housing 2, and a heat release hole 2 b is formed at a position above the valve 5 of the housing 2. The peripheral edge of the heat release hole 2 b is also painted similarly to the inner surface of the housing 2. On the outer surface near the peripheral edge of the heat escape hole 2b and on the side different from the outer lens 3, a rib 2c that protrudes outward of the housing 2 is provided in parallel with the peripheral edge portion of the heat escape hole 2b.

  Thus, the vehicular lamp 1 according to the present embodiment is provided with a heat shield plate 7 that covers the heat release hole 2 b formed in the housing 2 from the outside of the housing 2. Here, the heat shield plate 7 is composed of a flat steel plate, and the inner surface (the surface facing the heat escape hole 2b of the housing 2) is coated with the same high reflectance as the coating applied to the inner surface of the housing 2. It has been subjected. A silver-plated steel plate close to the paint color of the housing 2 may be used as the heat shield plate 7.

  One end of the heat shield plate 7 is inserted into a rib 2 c projecting from the back surface of the housing 2 and is fixed to the outside of the housing 2. That is, an elastic locking portion 7A that is folded back in a U shape is formed at one end of the heat shield plate 7, and as shown in FIG. 2, the locking portion 7A is cut at the center in the width direction. Triangular locking claws 7a are formed by raising. In addition, the clearance gap of the opening part of the latching | locking part 7A formed in the U-shape is set slightly smaller than the plate | board thickness of the rib 2c of the housing 2, and the latching claw 7a goes to the U-shaped back side. It is bent slightly toward the inside so as to protrude.

  Thus, the opening edge of the U-shaped engaging portion 7A of the heat shield plate 7 is aligned with the tip of the rib 2c of the housing 2, and the rib 2c is inserted. If the heat shield plate 7 is pushed in, the heat shield plate 7 is fixed to the housing 2 in a cantilever state so that the engaging portion 7A of the heat shield plate 7 sandwiches the rib 2c, and the heat release hole 2b formed in the housing 2 Covered from the outside by the heat shield plate 7. At this time, the tip corners of the locking claws 7a formed on the locking portions 7A of the heat shield plate 7 bite into the ribs 2c of the housing 2 in a direction that prevents the heat shield plates 7 from coming off. This prevents the heat shield plate 7 from coming off from the rib 2c. In the state where the heat shield plate 7 is fixed to the housing 2 and the heat release hole 2b is covered from the outside of the housing 2 as described above, the front end portion (free end) of the heat shield plate 7 is separated from the housing 2. A predetermined gap is formed between the two. Specifically, the portions other than the locking portion 7A of the heat shield plate 7 are separated from the housing 2, and a predetermined gap through which hot air can pass is formed between them. In other words, the heat shield plate 7 is bent in a crank shape from the engaging portion 7A portion to secure a predetermined gap with the housing 2, and the surface facing the heat release hole 2b includes the periphery of the heat release hole 2b. It extends along the outer surface and completely covers the upper part of the heat escape hole 2b. Moreover, it arrange | positions so that the front-end | tip part (free end) of the heat insulation board 7 may become a position higher than the latching | locking part 7A.

  As described above, in the vehicular lamp 1 according to the present embodiment, since the heat release hole 2b formed in the housing 2 is covered from the outside of the housing 2 by the heat shield plate 7, the outer lens 3 is transparent. Even when the outer lens 3 has a large lens cut for appearance and light distribution, the space on the back side of the housing 2 is not seen from the heat release hole 2b, and the appearance of the vehicular lamp 1 can be seen. Sexuality is enhanced. In this case, the heat shield 7 can only see the area of the heat escape hole 2b, and not the whole, so that the appearance of the vehicular lamp 1 is enhanced.

  Further, since the heat generated from the bulb 5 passes through the heat release hole 2b and is discharged to the outside of the housing 2 through the gap between the housing 2 and the heat shield plate 7, the heat dissipation of the vehicular lamp 1 is enhanced. Since the temperature rise in the lamp chamber 4 is suppressed, the heat resistance of the vehicular lamp 1 is improved. In this case, since the heat shield 7 that is heated is disposed outside the housing 2, the durability of the housing 2 is enhanced.

  Furthermore, in the present embodiment, since the engaging portion 7A of the heat shield plate 7 is inserted into the rib 2c formed on the housing 2 so as to fix the heat shield plate 7 to the housing 2, the simple shield structure is used to block the heat shield plate 7. The hot plate 7 can be easily attached to the outside of the housing 2.

  Further, in the present embodiment, the heat shield plate 7 is coated with the same coating as that applied to the inner surface of the housing 2, or a silver-plated steel plate close to the paint color of the housing 2 is used as the heat shield plate 7. Therefore, the appearance of the vehicle lamp can be improved without making the heat escape hole 2b inconspicuous. Further, the heat shield plate 7 functions as a reflector similarly to the inner surface of the housing 2, and the effect that the amount of light emitted from the vehicular lamp 1 is increased and the illuminance is increased is also obtained.

  Here, another form of the structure for fixing the heat shield 7 to the housing 2 is shown in FIGS. 3A is a partial perspective view showing the heat shield plate mounting structure, and FIG. 3B is a cross-sectional view taken along line AA of FIG. 3A.

  In the illustrated mounting structure, a pair of fitting grooves 2d facing each other on a part of the rear surface of the housing 2 are formed in parallel, and both side edges of the mounting portion of the heat shield plate 7 are fitted into these fitting grooves 2d. If the entire heat shield plate 7 is inserted and slid in the direction of the arrow, the heat shield plate 7 is easily fixed to the housing 2. Here, as shown in FIG. 3 (b), the upper surface of both end portions of the heat shield plate 7 (only one is shown in FIG. 3 (b)) has elasticity to abut on the upper surface of each fitting groove 2d. A plurality of convex portions 7b are formed side by side in the sliding direction, and are cut and raised toward the lower surface of each fitting groove 2d on the lower surface (specifically, between the convex portions 7b) of both end portions of the heat shield plate 7. A locking claw 7c is formed. Accordingly, the projection 7b and the locking claw 7c formed on the heat shield plate 7 abut on the upper and lower surfaces of the fitting groove 2d of the housing 2, whereby the heat shield plate 7 is held in the fitting groove 2d. In this state, it slides smoothly along the fitting groove 2d. Then, when the heat shield 7 is fixed to the housing 2, when the movement in the direction opposite to the insertion direction (the direction in which the heat shield 7 is removed) is engaged, the locking claw 7 c whose end is in the opposite direction to the insertion direction is fitted. Since the heat shield plate 7 is bitten into the lower surface of the groove 2d to prevent the heat shield plate 7 from moving in the reverse direction, the heat shield plate 7 is reliably prevented from coming off the housing 2.

  4 and 5 show other forms of the heat shield plate 7, respectively. 4 and 5, (a) is a partial cross-sectional view of a vehicular lamp showing another embodiment of the heat shield structure according to the present invention, and (b) is a perspective view of the heat shield plate.

  In the form shown in FIG. 4, a step is formed in the heat shield plate 7, and the step becomes higher as it goes to the lens 3 side (left direction in FIG. 4), and the gap with the housing 2 becomes larger. With this configuration, the gap between the heat shield plate 7 and the heat release hole 2b of the housing 2 is increased, and heat is efficiently discharged from the large gap to the outside of the housing 2, so that heat dissipation is further improved. If the vehicle lamp 1 is enhanced and higher durability is ensured, an effect is obtained. More specifically, this step is formed at a position that is at a height that is approximately the same height as the edge of the heat escape hole 2b on the lens 3 side, and is hidden at the periphery of the heat escape hole 2b when viewed from the lens side. As shown, the steps are arranged so that it is difficult to see.

  Further, in the embodiment shown in FIG. 5, a plurality of exhaust holes 7d that open toward the upper side of the lens (leftward in FIG. 5) are formed in the heat shield plate 7 in the shape of a louver. When viewed from the lens side, the exhaust hole 7d is not visible from the outside, the appearance of the vehicular lamp 1 is enhanced, and heat is efficiently discharged from the exhaust hole 7d to the outside of the housing 2, so that heat dissipation is achieved. As a result, it is possible to obtain the effect of ensuring higher durability of the vehicular lamp 1.

  Although the present invention has been described with respect to the embodiment in which the present invention is applied to the back lamps provided on the left and right sides of the rear part of the vehicle, the present invention is applicable to any other vehicular lamp in which a heat escape hole is formed in the upper part of the housing. Of course, the present invention can be similarly applied.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Housing 2a Housing insertion hole 2b Housing heat release hole 2c Housing rib 2d Housing fitting groove 3 Outer lens 4 Lamp chamber 5 Valve 7 Heat shield 7A Heat shield latch 7a Heat shield Locking claw 7b Projection part of heat shield plate 7c Locking claw of heat shield plate 7d Exhaust hole of heat shield plate

Claims (5)

A heat insulating structure for a vehicular lamp, wherein at least a bulb is accommodated in a lamp chamber defined by a housing and a lens covering the opening, and a heat escape hole is formed at a position above the bulb of the housing,
A heat shield structure for a vehicular lamp, comprising a heat shield plate that covers the heat release hole formed in the housing from the outside of the housing.   2. The vehicle according to claim 1, wherein a rib is formed on the housing, a locking portion is formed on the heat shield plate, and the rib is inserted into the locking portion to fix the heat shield plate to the housing. Heat shield structure for lighting fixtures.   The heat insulating structure for a vehicular lamp according to claim 1 or 2, wherein the heat insulating plate is configured in a step shape.   3. The heat insulating structure for a vehicular lamp according to claim 1, wherein an exhaust hole that opens upward of the lens is formed in the heat insulating plate. 5. The vehicular lamp according to claim 1, wherein the heat shield plate is coated with the same paint as the housing paint, or a silver-plated steel plate close to the housing paint color is used as the heat shield plate. Thermal insulation structure.

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