JP4166663B2 - Vehicle headlamp - Google Patents

Description

  The present invention relates to a vehicle headlamp, and more particularly to a vehicle headlamp that can effectively prevent freezing even when the outside air temperature is low.

  2. Description of the Related Art Conventionally, a technique for warming a front lens has been developed so that ice and snow do not adhere to the front lens of a vehicle headlamp (see, for example, Patent Document 1). 7 and 8 are perspective views showing the headlamp.

  As shown in FIG. 7, a radiator 103 as a heat exchanger is connected to the vehicle headlamp 101 via water conduits 105, 105, and the engine 103 is connected to the radiator 103 via water conduits 107, 107. 109 is connected.

  As shown in FIG. 8, the vehicle headlamp 101 includes a housing 111 disposed on the rear side, and a front lens 113 fitted to the front portion of the housing 111. A water passage 115 is disposed on the inner surface side of the lens 113 along the outer periphery of the front lens 113. In addition, connecting portions 115a and 115b are provided at both ends of the water passage 115, and cooling water w (see FIG. 7) is introduced from the upper connecting portion 115a, and the cooling water w is supplied from the lower connecting portion 115b. The water w is configured to be discharged.

  The flow of the cooling water w in the vehicle headlamp 101 having the above configuration will be described with reference to FIG.

  First, the cooling water w that has flowed through the engine 109 and warmed flows into the radiator 103 from the water conduit 107 and flows into the vehicle headlamp 101 from the radiator 103 through the water conduit 105.

In the vehicular headlamp 101, the cooling water w flows through the water passage 115 arranged along the inner surface side of the front lens 113, thereby preventing ice and snow from adhering to the front lens 113.
JP 2000-348521 A

  However, in the conventional vehicle headlamp 101, the water passage 115 is disposed in the front lens 113, and water is always passed even in hot seasons such as summer, so the internal temperature of the headlamp 101 rises. Therefore, it is necessary to employ a high heat resistance component for the synthetic resin component and the electronic component constituting the headlamp 101, and the cost of the headlamp 101 tends to increase.

  In addition, it is necessary to separately provide a means for preventing freezing called the water passage 115, and further, the vicinity of the water passage 115 and its connection portions 115a and 115b must be surely sealed, which further increases the manufacturing cost. Could rise.

  Accordingly, an object of the present invention is to provide a low-cost vehicle headlamp that does not require a separate component for preventing freezing.

  In order to achieve the above object, the vehicle headlamp described in claim 1 is configured such that the stay comes into contact with the outer periphery of the headlamp provided with a front lens at the front portion of the lamp body, In the vehicle headlamp held by the vehicle, the inside of the stay is formed hollow, and the inside of the stay is configured as a water passage through which a heat exchange medium flows.

  The vehicle headlamp described in claim 2 is the vehicle headlamp described in claim 1, characterized in that the heat exchange medium is cooling water discharged from a radiator.

  A vehicle headlamp described in claim 3 is the vehicle headlamp described in claim 1 or 2, characterized in that the stay is arranged along the outer peripheral surface of the front lens. .

  According to the vehicle headlamp described in claim 1, the interior of the stay is formed hollow, and the heat exchange medium flows through the water passage formed in the stay. Adhesion can be suitably suppressed. In addition, since the existing stay is used without adding new devices and parts, the manufacturing cost is suppressed and the arrangement space is not expanded.

  According to the vehicle headlamp described in claim 2, since the radiator and the cooling water which are conventionally arranged are used, freezing prevention can be performed at an inexpensive cost without adding a new device or the like. Can be achieved.

  According to the vehicle headlamp described in claim 3, since the stay is arranged along the outer peripheral surface of the front lens, the front lens to which ice and snow etc. are most likely to adhere is focused on efficiently. Can warm up. Further, since the front lens is warmed mainly, an excessive temperature rise inside the headlamp can be suppressed in summer or the like.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view showing a front end portion of a vehicle provided with a headlamp according to an embodiment of the present invention, and FIG. 2 is a plan view of FIG.

  A radiator 3 attached to the radiator support 1 is disposed at the center of the front end of the vehicle, and a vehicle headlamp 5 according to the present embodiment is disposed outside the radiator support 1 in the vehicle width direction. ing.

  The radiator support 1 is provided with a radiator 3 that is a heat exchanger. The radiator 3 is provided between an upper header pipe 7 provided at an upper end portion, a tube 9 communicated with the upper header pipe 7 and arranged at the same interval on the left and right sides, and the tubes 9. The fin 11 is joined to the side surface of the tube 9 by brazing.

  A stay 19 having upper and lower stay mounting pieces 13 and 15 projecting upward and downward is disposed at a side end of the radiator support 1, and bolts 17 are fastened to the stay mounting pieces 13 and 15.

  As shown in FIG. 2, the vehicle headlamp 5 includes a lamp body 21 disposed on the rear side, and a front lens 23 disposed on the front portion of the lamp body 21. The outer peripheral surface of the front lens 23 is gripped. As shown in FIGS. 1 and 2, a light source 25 is disposed on the back side of the lamp body 21.

  The stay 19 is made of, for example, an aluminum alloy, an iron alloy, or the like. As shown in FIGS. 3 to 5, the stay 19 is provided with a stay main body 27 that is formed in a substantially rectangular shape as a whole and on both left and right sides of the stay main body 27. The mounting pieces 13, 15, and 29 are integrally formed. The mounting pieces include upper and lower inner mounting pieces 13 and 15 projecting inward in the vehicle width direction and outer mounting pieces 29 projecting outward in the vehicle width direction. Bolt fastening holes 13a, 15a, 29a for inserting the bolts 17 are formed.

  Further, the inside of the stay main body 27 is formed in a hollow shape, and a water passage through which the cooling water from the radiator 3 flows is formed. And as shown in FIG. 4, the water stop part 31,33,35 which stops the flow of a cooling water is formed in the inside of the stay main body 27 at three places, and the A part and B part of FIG. The cooling water is configured not to flow. In addition, A part is a site | part extended from the water stop part 31 arrange | positioned in the base part of the said outer side attachment piece 29 to the vehicle width direction outer side, and B part was arrange | positioned in the vicinity of the said inner side attachment pieces 13 and 15. This is a portion provided between the upper and lower water stop portions 33, 35. Further, as shown in FIG. 5, the upper end and the lower end of the stay 19 are provided with an introduction port 37 and a discharge port 39 extending rearward of the vehicle, and these introduction port 37 and the discharge port 39 are water passages inside the stay. It is communicated to.

  As shown in FIGS. 1 and 2, a water conduit 41 is connected to the inlet 37, and a drain pipe 43 is connected to the outlet 39. Further, the water conduit 41 is connected to the upper header pipe 7 of the radiator 3, and the drain pipe 43 is connected to a lower header pipe (not shown).

  The flow path of the cooling water in the stay 19 of the vehicle headlamp 5 having the above configuration will be described.

  First, as shown in FIG. 6, the cooling water W discharged from the upper header pipe 7 of the radiator 3 flows into the water passage inside the stay 19 from the introduction port (see FIG. 2) of the stay 19 through the water conduit 41. .

  Next, the cooling water W flows along the outer periphery of the front lens 23 as shown by the arrow in FIG. 6, is discharged from the discharge port (see FIG. 5) 39 to the drain pipe 43, and is not shown in the lower header pipe of the radiator 3. Flow into.

  The above vehicle headlamp 5 has the following operational effects.

  Since the inside of the stay 19 is formed hollow and the cooling water discharged from the radiator 3 flows through the water passage formed in the stay 19, it is preferable to prevent the snow and the like from adhering to the headlamp 5. be able to. In addition, since the existing stay 19 is used without adding new devices and parts, the manufacturing cost is suppressed and the arrangement space is not expanded.

  Moreover, in this embodiment, since the radiator 3 and the cooling water which were conventionally arrange | positioned are utilized, freezing prevention can be aimed at cheap cost, without adding a new apparatus etc.

  Further, since the stay 19 is disposed along the outer peripheral surface of the front lens 23, the front lens 23 to which ice and snow etc. are most likely to adhere can be warmed effectively. Further, since the front lens 23 is warmed mainly, an excessive temperature rise inside the headlamp 5 can be suppressed in summer or the like.

  In the present invention, various changes and modifications are possible without being limited to the above-described embodiments.

It is a front view which shows the front-end part of the vehicle which arrange | positioned the headlamp by embodiment of this invention. It is a top view of FIG. It is a top view of the stay by the embodiment of the present invention. It is a front view of the stay by the embodiment of the present invention. It is a side view of the stay by the embodiment of the present invention. It is a front view which shows the state which is flowing the cooling water inside the stay by embodiment of this invention. It is a perspective view which shows the headlamp, the radiator, and engine which show the state which is flowing the cooling water into the conventional vehicle headlamp. It is a perspective view which shows the conventional vehicle headlamp.

Explanation of symbols

3 ... Radiator 19 ... Stay 21 ... Lamp body 23 ... Front lens W ... Cooling water (heat exchange medium)

Claims (3)

In a vehicle headlamp that is held by a vehicle by providing a front lens (23) at the front of the lamp body (21) and holding the stay (19) in contact with the outer periphery of the front lens (23),
A vehicular headlamp characterized in that the inside of the stay (19) is formed hollow and the inside of the stay (19) is configured as a water passage through which a heat exchange medium (W) flows.   The vehicle headlamp according to claim 1, wherein the heat exchange medium is cooling water (W) discharged from a radiator (3). The vehicle headlamp according to claim 1 or 2, wherein the stay (19) is disposed along an outer peripheral surface of the front lens (23).

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