JP7401732B2 - vehicle working lamp - Google Patents

Description

The present invention relates to a vehicular working lamp mounted on a working vehicle such as a forklift.

Patent Document 1 discloses a headlamp unit that includes a heat sink that radiates heat from an LED light source.

Japanese Patent Application Publication No. 2018-190618

In Patent Document 1, the fins are provided vertically. For this reason, when a plurality of LEDs are provided in the vertical direction, it is thought that it becomes difficult for the heat of the LEDs arranged on the upper side to escape.

An object of the present invention is to provide a working lamp for a vehicle with high heat dissipation.

A working lamp for a vehicle according to the present invention includes a vertically long lens on the front surface and a vertically long heat sink on the back surface. A plurality of LED lamps are arranged vertically along the lens, the lens has a light adjusting section corresponding to each LED lamp, and fins of the heat sink are formed in the vertical direction, and an upper side of the fin and the lower part is formed so that the interval is wider than the center part.

In the working lamp for a vehicle according to the present invention , since a plurality of LED lamps are arranged vertically along a vertically elongated lens, the upper LED lamp is the upper LED lamp, and the lower LED lamp is located on the upper side when used upside down. Heat tends to accumulate in the LED lamp. Since the upper and lower sides of the vertical fins are formed with a wider gap than the center side, heat dissipation on the upper and lower sides is high, and the LED lamp on the upper side and the vertically inverted This prevents heat from accumulating in the lower LED lamp located above when used.

FIG. 1(A) is a front perspective view of a working lamp for a vehicle according to a first embodiment of the present invention, FIG. 1(B) is a side view, and FIG. 1(C) is a rear perspective view. It is. FIG. 2 is an explanatory diagram of the fin structure of the vehicle working lamp according to the first embodiment. FIG. 3(A) is an explanatory diagram of a fin structure of a working lamp for a vehicle according to a second embodiment, and FIG. 3(B) is an explanatory diagram of a fin structure of a conventional technique. FIG. 4(A) is a temperature distribution diagram of the fin structure of the first embodiment, and FIG. 4(B) is a temperature distribution diagram of the fin structure of the prior art. FIG. 5(A) is a temperature distribution diagram of the fin structure of the second embodiment, and FIG. 5(B) is a temperature distribution diagram of the fin structure of the prior art.

[First embodiment]
FIG. 1(A) is a front perspective view of a vehicle working lamp 10 according to a first embodiment of the present invention, FIG. 1(B) is a side view, and FIG. 1(C) is a rear perspective view. It is a diagram.
The vehicular working lamp 10 is mounted on a working vehicle such as a forklift, and includes a vertically elongated lens 20 on the front surface. The lens 20 has light adjustment sections 22 arranged in five vertical stages along the lens. On the back surface of the light adjustment section 22, a plurality of LED lamps (not shown) are arranged vertically along the lens. LED lamps are arranged corresponding to the five stages of light adjustment sections 22. Each light adjustment section 22 is configured to transmit light from the LED lamp to the front and diffuse it to both sides. The lens 20 and the light adjustment section 22 are integrally formed of acrylic.

The vehicle working lamp 10 includes a vertically elongated heat sink 30 on the back surface. FIG. 2 is an explanatory diagram of the fin structure of the vehicle working lamp according to the first embodiment. The fins 32 of the heat sink 30 are formed in the vertical direction. The fin spacing du on the upper side 32U of the fins 32 and the fin spacing dd on the lower side 32D are wider than the fin spacing dc on the center side 32C. The heat sink 30 is provided on the back side of a substrate (not shown) that holds the LED lamp. The heat sink 30 is made of aluminum.

A cylindrical support portion 40 for fixing a vehicle working lamp is provided at the lower end 30D of the heat sink 30 along the width direction of the heat sink. The cylindrical support part 40 is sandwiched between U-shaped brackets 50. The cylindrical support part 40 is positioned on the bracket 50 by fixing the axis 42 from the cylindrical support part 40 with a nut 44 . The bracket 50 is fixed to the work vehicle via bolts 52. As shown in FIG. 1(C), the lower side 32D of the fin extends to the cylindrical support part 40, and the fin 32 protrudes further to the back side than the cylindrical support part 40. Thereby, the flow of air into the fins 32 is not interfered with by the cylindrical support portion 40 that supports the vehicle working lamp. The heat sink 30 is provided with a heat radiation vent 34 approximately at the center. Since the fin spacing is narrow and the heat radiation vent 34 is provided on the center side where the air flow rate increases, hot air within the vehicle working lamp can be efficiently exhausted.

FIG. 4(A) is a temperature distribution diagram of the radially arranged fin structure of the first embodiment, and FIG. 4(B) is a temperature distribution diagram of the conventional fin structure arranged vertically. The radially arranged fins of the first embodiment shown in FIG. 4A have a lower temperature than the vertically arranged prior art fins shown in FIG. 4B.

The vehicle working lamp of the first embodiment can also be used in a manner in which it is upside down from the mode in which it is supported from below as shown in FIG. 1(A) and is suspended from above.
In the vehicle working lamp 10 according to the first embodiment, the plurality of LED lamps are arranged vertically along the vertically elongated lens 20, so that the upper LED lamp is located at the upper side when used upside down. Heat tends to accumulate in the lower LED lamp. Since the upper side 32U and lower side 32D of the fins 32 formed in the vertical direction are formed so that the interval is wider than the center side 32C, the heat dissipation of the upper side 32U and the lower side 32D is high, and the upper side Heat can be prevented from accumulating in the LED lamp and the lower LED lamp located on the upper side when used upside down.

[Second embodiment]
FIG. 3(A) is an explanatory diagram of a radial fin structure of a vehicle working lamp according to the second embodiment, and FIG. 3(B) is an explanatory diagram of a conventional fin structure formed vertically.
The configurations of the lens and LED of the second embodiment are similar to those of the first embodiment described above with reference to FIG. The fin structure of the vehicle working lamp of the second embodiment is formed such that the fin spacing on the upper side 32U of the fins 32 is wider than the fin spacing on the lower side 32D.

FIG. 5(A) is a temperature distribution diagram of the fin structure of the second embodiment, and FIG. 5(B) is a temperature distribution diagram of the fin structure of the prior art. In the second embodiment, the fin spacing on the upper side 32U of the fins 32 is formed to be wider than the fin spacing on the lower side 32D, so that air flows smoothly as shown in FIG. 5(A). Therefore, the temperature on the upper side is lower than that of the conventional fin structure.

In the vehicle working lamp 10 of the first embodiment, since the plurality of LED lamps are arranged vertically along the vertically long lens 20, heat tends to accumulate in the upper LED lamp. Since the upper side 32U of the fins 32 formed in the vertical direction is formed so that the interval is wider than the lower side 32D, the heat dissipation of the upper side 32U is high, and heat does not accumulate in the upper LED lamp. Can be done.

10 Vehicle working lamp 20 Lens 22 Light adjustment section 30 Heat sink 32 Fin 32U upper side 32D lower side 32C center side

Claims (4)

A working lamp for a vehicle, comprising a vertically-shaped lens on the front and a vertically-shaped heat sink on the back,
a plurality of LED lamps are arranged vertically along the lens;
The lens has a light adjustment section corresponding to each LED lamp,
The fins of the heat sink are formed in the vertical direction, and the upper and lower sides of the fins are formed with a wider interval than the center side,
The heat sink is provided with a heat radiation vent,
A cylindrical support part for fixing a vehicle working lamp is provided at the lower end of the heat sink along the short direction of the heat sink,
A lower side of the fin extends to the cylindrical support part, and the fin projects further toward the back side than the cylindrical support part. The vehicle working lamp according to claim 1 ,
The heat sink is provided on the back side of the substrate holding the LED lamp. The vehicle working lamp according to claim 1 or 2 ,
The heat sink is made of aluminum. The vehicle working lamp according to any one of claims 1 to 3 ,
The lens is made of acrylic.

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