JPH0113604B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a headlamp for a vehicle.

The problem of fogging of headlight diffusers and reflectors by condensed water vapor has not been satisfactorily solved to date, despite many proposals. A known solution consists in exchanging the air inside the headlamp with outside air via an opening. For this purpose, the pressure must be increased by the internal air, which is heated when an incandescent lamp is connected.

However, the difficulty of the above ventilation type is that in practice, if sufficient air exchange can be carried out, the seal against water will be insufficient, whereas if the seal against water is sufficient, the air exchange will not be sufficient. The problem lies in the fact that the clouding inside the lamp is not satisfactorily prevented or removed.

In an embodiment of the invention, the headlamp has an air inlet in the lower section and an air outlet in the upper section, and a channel into which the air outlet opens is arranged in the side or rear section of the headlamp. The opening of this passage slopes downward toward the rear, and protrudes at the front edge toward the headwind encountered during driving.

With the headlamp for a vehicle according to the invention, it is achieved in a simple manner that the inner surface of the headlamp is not clouded by condensed water and that no water penetrates into the interior of the headlamp. The present invention is based on the idea that a suction effect is produced at the air outlet, and this suction effect is caused by a headwind while the vehicle is running, and by a ventilation effect when the vehicle is stopped. having a mounted ventilation tube;
In contrast to vehicle lighting systems already known for centuries, the channel according to the invention is arranged in the lateral or rear region of the headlight.

Advantageous embodiments of the invention are defined in the second patent claim.
Term, 3rd term, 4th term, 5th term, 6th term, 7th term,
Described in Section 8. The embodiment of the so-called casing-type headlamp according to claim 2 provides a ventilation device that can be adapted to conventional casings without significant outlay. If the headlight is constructed according to claim 3 or 4, the desired water protection is obtained even under unfavorable driving conditions. Most headlight casings are made from plastic. For this purpose, two
Two passage structures have been proposed.

The invention will now be explained with reference to the illustrated embodiment.

Most of the casing type headlights 10 are cap 1.
2, a diffuser plate 13 and a reflector 20 with an incandescent bulb 9, said casing 11 and cap 12 being made of plastic. The headlight 10 is fixed to the vehicle body 14 via a member not shown. An air outlet 16 is arranged in the upper side section of the casing 11, which opens into a channel 15 with a lower opening 17 and an upper opening 18. Since the upper opening 18 of the passage 15 is sloped downward toward the rear, the front edge 34 of the opening 18 protrudes toward the headwind received during driving. Reflector 20
is adjustably fixed within the interior 19 of the headlamp 10 and the air inlet portion 21 is positioned opposite the air outlet portion 16 in the casing 1 .
It is located within 1.

Since, during operation, outside air flows above the upper opening 18 of the channel 15, a suction effect is created which also creates a negative pressure in the air outlet 16, according to Bernoulli's theorem, so that the air flows into the interior 19.
flows to the outside. This results in an inflow of outside air into the interior 19 of the headlamp 10 via the air inlet 21.

When the vehicle is stationary and the incandescent lamp 9 is switched off, the channel 15 acts as a ventilation tube, so that the air exchange within the interior 19 of the headlamp 10 is effected, even if the intensity is very small. A suction effect is likewise produced at the air outlet 16.

The casing-type headlamp 30 in FIG. 2 has a casing 31 having a substantially rectangular shape. The tubular channel 15 is arranged in the upper lateral section 33 in such a way that the upper opening 18 of said channel 15 is located in the headwind encountered when driving and in this case the opening 18 faces the headwind. Since the edge 34 is located high, a head wind passes along the edge side. This creates a suction effect within the passage 15. The lower opening 17 is located in the shade of the headwind. The tube element 35 is arranged in a lower section 32 of the casing 31 located opposite the passage 15, and the two openings 37, 38 of said tube element 35 are not grazed by head winds.

One tube piece 36 in each case connects the interior 39 to the passage 15.
and a tube element 35, in which case the end section of each tube piece 36 is slanted to prevent water entering the channel 15 or the tube element 35 from penetrating into the interior 39 of the casing 31. It's been cut out. The beveled end section of the tube opening into the channel 15 results in an increased velocity of the air flow in the channel reduction and thus a strong suction effect on the interior. Airflow is illustrated by arrows.

The channel 45 in FIG. 3 is integrated into a cap 42 which closes off the housing 41 of the housing headlamp 40 at the rear. An air outlet, also formed as a tube piece 36, connects the interior 39 of the housing 41 with a channel 45, the upper opening 18 of which is located in the headwind and the lower opening 17 in the wind shade. are doing.
The air inlet part is designed as a tube piece 43, both of which are arranged on the underside of the housing 41. The suction and ventilation effects in the area of the upper opening 18 and the tube piece 36 are the same as described above.

FIG. 4 has an integrally molded tube piece 56.
A casing 51 made of plastic is shown in part, the tube piece 56 having an annular groove 57 located on the outside. A projection 58 protrudes from the channel 55, which is also made of plastic, and which is directed towards the inside of the locking body 5.
9, this stop 59 is radially outwardly elastic. When the casing 51 and the passage 55 are connected, the locking body 59 is snapped into the annular groove 57, so that the passage 5
5 and the casing 51 are releasably fixed to each other by a snap connection.

In the embodiment of FIG. 5, the tube piece 66 is made of elastic plastic and has a sleeve 67 with an annular lip 60 and a tubular stop 64. Inside the plastic passage 65 is a tube piece 66.
is inserted, and the annular lip 60 ensures the insertion position. The casing 61 has a notch 62. When the channel 65 is connected to the housing 61, the annular stop 64 of the tube piece 66 engages behind the recess 62.
A large number of protrusions 6 integrally formed on the casing 61
3 holds the passageway 65 in place.

Another passageway embodiment made of plastic is shown in the sixth example.
In this case the casing 71
A tube piece 76 and two side walls 72 (located one after the other in the drawing) project in one piece from it. The plastic strip 73 has a number of latches 71 which engage in and engage grooves 75 in the respective side wall when the side walls and strip are connected. thus forming a releasable bond.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a casing-type headlight installed on a vehicle, and Fig. 2 is a side view of a casing-type headlamp with an exhaust passage provided in the casing. Figure 3 is a rear view of the headlamp, and Figures 4 and 5 are rear views of a casing-type headlamp with an exhaust passage provided in the cap.
6 are enlarged sectional views showing three embodiments of the passage, respectively. 9... Incandescent light bulb, 10, 30, 40... Headlight, 1
1, 31, 41, 51, 61, 71...Casing, 12, 42...Cap, 13...Diffusion plate, 14
...Vehicle body, 15, 45, 65... Passage, 16... Air outlet section, 17, 18, 37, 38... Opening, 1
9, 39... Inside, 20... Reflector, 21... Air inlet section, 32, 33... Division, 34... Front edge, 35... Pipe member, 43, 36, 56, 66, 76... Tube piece, 5
7... Annular groove, 59, 64, 74... Locking body, 60...
Annular lip, 62...notch, 58, 63...protrusion,
67...Sleeve, 72...Side wall, 73...Strip, 75
…groove.

Claims (1)

Claims: 1. The headlight 10, 30, 40 has an air inlet section 21, 36, 43 in the lower section and an air outlet section 16, 36 in the upper section, Passages 15 and 45 with air outlet openings are arranged in the rear section, and the openings 18 of these passages are inclined downwardly toward the rear and protrude at the front edge 34 in the direction of headwinds received during driving. A headlight for a vehicle that is characterized by: 2. The headlight has a casing, in which a passage 15 is arranged in the upper lateral section of the casing 11, 31, and the air inlet 21, 36 is located in the casing 11, 31, opposite said passage 15. 2. A headlamp as claimed in claim 1, wherein the headlamp is provided in a lower section located along the lower section. 3. The air inlet portion is formed as a tube piece 36, and the tube member 35 is arranged in the headlight 30 so that the upper and lower openings 37, 38 of the tube member 35 are located in the shade of the headwind. A headlamp according to claim 2, wherein the tube piece 36 protrudes into the tube member 35 and has an opening in a direction different from the opening 37 on the upper side of the tube member. . 4. The headlamp has a casing and a cap, in which a passage 45 is arranged, the air inlet being formed as a tube piece 21, 43 provided on the underside of the casing 11, 41. A headlamp according to claim 1. 5. The air outlet is designed as a tube piece 36 which projects into the channel 15, 45 and has an opening oriented in a different direction than the upper opening 18 of the channel. The headlight described in any one of paragraphs 2 to 4. 6. A headlamp according to claim 5, in which the opening of the tube piece 36 forming the air outlet is located approximately at two-thirds of the height of the passages 15, 45. 7. The headlamp has a casing or cap made of plastic, and the channels 15, 45 and the tube part 35 are made of plastic and are connected to the casing 11, 31, 4 by means of a snap connection.
1 or a cap 42. 8. The headlamp has a casing or cap made of plastic, which casing 11,
31 or two side walls 72 integrally from the cap 42
protrudes, and strips 73 are engageable in both side walls and form passages 71, 72, 73 together with the side walls. Light.