JPH0647821U - Heat dissipation structure of meter case - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose of the present invention is to solve the problem caused by heat of the wiring board and the lamp by efficiently dissipating heat in the recess in the meter case having the recess for mounting the lamp on the back surface. A meter case 10 of a combination meter provided with an in-meter unit for driving a pointer and a lamp for a warning lamp, wherein a part of the case 10 on the back side is recessed to the front side to form a recess 14. In the meter case 10 in which the lamp 13 for internal illumination of the meter case 10 is mounted in the mounting hole 13a provided in the bottom surface 15 of the recess 14, in the wall surface 16 surrounding the recess 14, at least the lower wall surface 16 '. Is provided with a ventilation hole 2, 3 penetrating the V-shaped groove 1 or a part 11a of the meter case 10 as an air passage communicating with the space below the meter case 10, and when the lamp 13 for internal illumination is turned on. Cooling air is introduced into the recess 14 from this air passage to radiate heat from the recess 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat dissipation structure of a meter case, and more particularly to a heat dissipation structure of a meter case that can sufficiently dissipate heat from a peripheral portion of a lamp mounted in a recess formed on the back surface of the meter case.

[0002]

[Prior art]

 Conventionally, in combination meters used in automobiles, in addition to pointer meters such as speedometers, engine tachometers, and fuel gauges, battery charging abnormalities, exhaust gas purification catalyst abnormalities, handbrake on / off status, etc. The warning lamp shown is provided. Then, on the back side of the case of the combination meter, there are provided mounting holes for a lamp for illuminating these pointer-type meters and a lamp for lighting a warning lamp.

FIG. 5 shows the configuration of the back side of a meter case 10 of a conventional combination meter. The meter case 10 of the combination meter is provided with a large number of holes 12 for mounting a lamp for illuminating a pointer-type meter and a lamp for lighting a warning lamp on a back surface 11 thereof. A wiring board made of a flexible substrate is generally laid on the back surface 11 of the meter case 10, and a lamp is mounted on the wiring board so that power is supplied to the lamp through the wiring board. .

Usually, a lamp 13 is attached to the rear surface 11 of the meter case 10 at the position of the rear surface 11, as shown in FIG. 6 (a). However, there are cases where it is desired to move the position of the lamp 13 to the front side of the meter case 10 due to the improvement of the illumination in the meter case 10. This is because the lamp light may not be circulated around the scales of meters and shadows may be generated on the scales. In such a case, conventionally, as shown in Fig. 6 (b), the meter case is used. It has been performed that the back surface 11 of 10 is dropped forward to form a recess 14, and the lamp 13 is attached to the bottom surface 15 of the recess 14.

FIG. 7 shows an example in which a recess 14 is formed on one side surface of the back surface 11 of the meter case 10 and the lamp 13 is attached to the bottom surface 15. In this way, by providing the lamp 13 on the front side of the meter case 10, it is possible to remove the shadow generated on the scale part of the meters.

[0006]

[Problems to be solved by the device]

 However, when the concave portion 14 is formed in the meter case 10 and the lamp 13 is attached to the bottom surface 15 thereof as described above, the gap between the lamp 13 and the wall surface 16 around the concave portion is narrow, and thus the lamp 13 is not lighted when the lamp 13 is turned on. The generated heat is trapped in the recess 14 and the temperature of the lamp terminal portion of the wiring board (not shown) laid between the lamp 13 and the bottom surface 15 rises, the wiring board is deformed, and the heat shortens the life of the lamp. There was a problem such as becoming.

As a measure for preventing the heat from being generated by the lamp 13 in the recess 14, it is conceivable to remove a part 11a of the meter case 10 below the recess 14 indicated by a chain double-dashed line in FIG. However, if this portion is removed, a new problem occurs that the degree of freedom in designing the meter case 10 is reduced.

Therefore, the present invention suppresses an increase in temperature around the lamp in a combination meter including a pointer-type meter and a warning lamp even when the lamp is mounted by providing a recess on the back surface of the meter case. It is an object of the present invention to provide a heat dissipation structure for a meter case that can be used.

[0009]

[Means for Solving the Problems]

 The heat dissipating structure of the meter case of the present invention which achieves the above-mentioned object is a meter case of a combination meter provided with a meter internal unit for driving a pointer and a lamp for a warning lamp. In a meter case in which a lamp for internal illumination of the meter case is mounted in a mounting hole provided in the bottom surface of the recess, the recess is formed on the front side, and at least one of the wall surfaces surrounding the recess is An air passage communicating with the space below the meter case is provided on the lower wall surface, and cooling air flows into the recess from the air passage when the lamp for internal illumination is turned on. To do.

[0010]

[Action]

 According to the heat dissipating structure of the meter case of the present invention, the lamp installation recess provided on the back surface of the meter case is provided with the air passage communicating with the space below the meter case at least on the lower wall surface thereof. Therefore, when the lamp is turned on and the temperature inside the recess rises, cool cooling air is introduced into the recess from the lower side of the recess through the air passage, so that the temperature-increased air flows to the side of the recess or It is easy to escape from above, and the heat in the recess is radiated. As a result, the temperature rise in the recess is suppressed, the temperature rise of the terminal portion of the wiring board is suppressed, the wiring board is less likely to be deformed, and the life of the lamp is improved.

[0011]

【Example】

 Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The same components as those of the conventional meter case 10 described with reference to FIGS. 5 to 7 will be denoted by the same reference numerals.

FIG. 1 shows the structure of one embodiment of the heat dissipation structure of the meter case of the present invention, and shows the entire structure of the rear side of the meter case 10 of the combination meter mounted on the automobile. On the back surface 11 of the meter case 10 of the combination meter of this embodiment, a large number of lamp mounting holes 12 for illuminating a pointer-type meter and a lamp for lighting a warning lamp are provided. In this case, a wiring board made of a flexible substrate is laid on the back surface 11, a lamp is attached from above, and power is supplied to the lamp via this wiring board.

In this embodiment, similarly to the structure described with reference to FIG. 7, one side surface side of the back surface 11 of the meter case 10 is dropped to form a recess 14, and the bottom surface 15 thereof is provided with a lamp mounting hole 13a. It is assumed that the lamp 13 is mounted in the mounting hole 13a to remove the shadow generated on the scale part of the meters.

When the concave portion 14 is formed in the meter case 10 and the lamp 13 is attached to the bottom surface 15 of the concave portion 14 in this manner, in this embodiment, the amount of heat remaining in the concave portion 14 generated by the lamp 13 is reduced. As a prevention structure, two V-shaped grooves 1 communicating with the space below the meter case 10 are formed in a part 11a of the meter case 10 below the recess 14. FIG. 2A shows an enlarged view of the recess 14 with the lamp 13 attached to the recess 14. It is assumed that the wiring board on which the power supply line to the lamp 13 is printed is actually provided on the bottom surface 15 of the recess 14.

As described above, when two V-shaped grooves 1 communicating with the space below the meter case 10 are formed in the part 11 a of the meter case 10 below the recess 14, the recess 14 has a lamp. Even if the lamp 13 is attached and the lamp 13 is turned on and heat is generated from the lamp 13, cooling air is introduced from the V-shaped groove 1 communicating with the space below the meter case 10 as shown by an arrow C, The heat generated in 1 is radiated from above the recess 14 as shown by an arrow H. At this time, if there is a margin in the portion of the meter case 10 above the recessed portion 14, the heat dissipation groove 5 for releasing heat upward can be further formed as shown by the dotted line, and the heat dissipation effect will be further enhanced. Become.

In this way, by forming the two V-shaped grooves 1 communicating with the space below the meter case 10 without completely cutting off the part 11a of the meter case 10 below the recessed portion 14, As shown in FIG. 2 (b), parts such as the buzzer 4 can be attached between the part 11a of the meter case 10 and the main body of the meter case 10, and the degree of freedom in design is improved. Reference numeral 17 shown in FIG. 2B is a wiring board laid on the back surface 11 of the meter case 10.

FIG. 3 is a partial side view including a partially cutaway cross section of a meter case 10 showing the structure of another embodiment of the heat dissipation structure of the meter case of the present invention, and the same constituent members as those explained in FIG. Are given the same reference numerals. In this embodiment, two ventilation holes 2 communicating with the space below the meter case 10 are formed in the lower wall surface 16 ′ of the wall surface 16 surrounding the recess 14. Also in the heat dissipation structure of the meter case of this embodiment, even if the lamp 13 is attached to the recess 14 and the lamp 13 is turned on and heat is generated from the lamp 13, a vent hole communicating with the space below the meter case 10 is provided. Since the cooling air is introduced from 2 as shown by arrow C, the heat generated in the lamp 13 is radiated.

FIG. 4 is a partial side view including a partially cutaway cross section of a meter case 10 showing the structure of a heat dissipation structure for a meter case of the present invention, which is the same as the constituent members described in FIG. The members have the same reference numerals. Also in this embodiment, the ventilation hole 3 communicating with the space below the meter case 10 is formed in the lower wall surface 16 'of the wall surface 16 surrounding the recess 14, but the ventilation hole of this embodiment is not provided. 3 is formed so as to extend the bottom surface 15 of the recess 14 downward. Therefore, the width of the vent hole 3 in this embodiment is substantially the same as the width of the bottom surface 15 of the recess 14. A wiring board 17 laid in the recess 14 is extended and attached in the vent hole 3.

Therefore, in the heat dissipation structure of the meter case of this embodiment, the lamp 13 is attached to the recess 14 to light the lamp 13, heat is generated from the lamp 13 and communicates with the space below the meter case 10. When the cooling air is introduced from the ventilation hole 3 into the concave portion 14 as shown by the arrow C, the wiring board 17 extended into the ventilation hole 3 is cooled by the cooling air. Therefore, in the heat dissipating structure of the meter case of this embodiment, the heat dissipating region of the heat generated in the lamp 13 is increased, and the heat dissipating effect is larger than that of the heat dissipating structures of the meter cases of the two embodiments described above.

In the embodiment described above, the case where the recess 14 is provided on the side of the meter case 10 has been described, but the present invention is also effective when the recess 14 is provided in the center of the meter case 10. In this case, if the ventilation hole is provided in the wall surface 16 on the upper side of the recess 14, the effect is further enhanced.

[0021]

[Effect of device]

 As described above, according to the present invention, a part of the case on the back side of the meter case is recessed to the front side to form a recess, and the mounting hole provided on the bottom of the recess is used to illuminate the inside of the meter case. In the meter case to which the lamp for lamps is attached, the heat generated when the lamp is lit is radiated by the cooling air from the air passage that communicates with the space below the meter case. The effect is that the rise is prevented, the wiring board is not deformed, and the life of the lamp is not shortened by heat.

[Brief description of drawings]

FIG. 1 is a rear view of a meter case showing a configuration of an embodiment of a heat dissipation structure of a meter case of the present invention.

2 (a) is a partially enlarged perspective view showing the periphery of the recess of FIG. 1 in an enlarged manner, and FIG. 2 (b) is a perspective view of the portion for explaining the advantages of the heat dissipation structure of the meter case shown in (a). is there.

FIG. 3 is a partially cutaway side view showing the configuration of another embodiment of the heat dissipation structure of the meter case of the present invention.

FIG. 4 is a partially cutaway side view showing the configuration of still another embodiment of the heat dissipation structure of the meter case of the present invention.

FIG. 5 is a rear view of the meter case showing the configuration on the back side of the conventional meter case.

6A is a partially cutaway side view showing a normal lamp mounting position in the meter case of FIG. 5, and FIG. 6B is a case where the lamp mounting position is moved to the front side in the meter case of FIG. 3 is a partially cutaway side view of the meter case showing FIG.

FIG. 7 is a partial perspective view of the meter case showing the configuration example of FIG. 6 (b).

[Explanation of symbols]

 1 V-shaped groove 2, 3 Vent hole 10 Meter case 11 Back of meter case 11a Part of meter case 12 Lamp mounting hole 13 Lamp 14 Recessed portion 15 Recessed bottom surface 16 Wall surface 17 Wiring board

Claims (1)

[Scope of utility model registration request] 1. A meter case of a combination meter provided with a meter internal unit for driving a pointer and a lamp for a warning lamp, wherein a part of the case on the back side is recessed to the front side to form a recess. , In a meter case in which a lamp for internal illumination of the meter case is mounted in a mounting hole provided on the bottom surface of the recess, on at least a lower wall surface of wall surfaces surrounding the recess,
An air passage communicating with a space below the meter case is provided, and cooling air flows from the air passage into the recess when the lamp for internal lighting is turned on. .