DE102018222335B4 - Motor vehicle headlights and motor vehicle - Google Patents

Abstract

Motor vehicle headlight with a housing (10) which has a transparent and/or translucent cover (6), at least one illuminant (40) being arranged on an adjustable holder (12) in an interior space (8) of the housing (10), wherein the holder (12) has a bearing journal (22) which is mounted on at least one bearing (16; 16`) arranged in the housing (10), the bearing (16; 16`) having a bimetallic spring (26) for generating a preload on the bearing journal (22).

Description

A motor vehicle headlight and a motor vehicle are described here.

Motor vehicle headlights and motor vehicles of the type mentioned are known. Motor vehicle headlights must be height-adjustable in many countries in order to enable leveling. Leveling is necessary in order to always be able to comply with legal standards with regard to light emission in the case of different loading conditions of the motor vehicle. If the motor vehicle is heavily loaded, for example in the trunk, the motor vehicle sinks in at the rear, as a result of which the light axis of the low beam and high beam shifts upwards. If there were no level compensation, oncoming traffic could be dazzled by the light shining further upwards, which could cause potentially dangerous situations.

Leveling requires that the position of the light source can be adjusted relative to the motor vehicle, in particular pivoting of the light source about an axis in the transverse direction of the vehicle. This is usually solved in that the light source is arranged such that it can pivot relative to a headlight housing in which the light source is arranged.

Most headlights have plastic components. Since the moving components of a height adjustment of a headlight should be free of play, on the one hand to avoid noise such as rattling and on the other hand to hold the lamp precisely, they are usually mounted under pretension. In the long run, however, this can lead to the plastic giving way as it plastically deforms. The preload can also be the cause of a defect in the height adjustment, for example due to material fatigue and breakage or due to blocking of the components that move in relation to one another.

The DE 10 2005 024 781 A1 discloses an automotive headlamp including a housing, a light source unit disposed in front of the housing, and an optical axis adjusting mechanism provided between the housing and the light source unit to tilt the light source unit about a tilting center axis so as to adjust the optical axis of the light source unit, wherein the optical axis adjustment mechanism comprises: a tilting fulcrum provided between the housing and the light source unit, an adjustment screw rotatably supported on the housing, and a synthetic resin nut member threadedly engaged on the a Adjusting screw is seated and placed on the light source unit, with the synthetic resin nut part being interlocked with rotation of the adjusting screw so that it performs forward or backward movement so as to tilt the light source unit about the tilting center axis defined by the tilting fulcrum passes through, the synthetic resin nut comprising: a nut main body, a screw thread fastening portion provided in the nut main body, and a leaf spring sliding portion which is elastically engaged with a guide groove in the housing to hold the synthetic resin nut thereon and fixed to the nut main body branches, wherein the leaf spring sliding portion is made of a first resin, and the nut part main body is made of a second resin that has higher heat resistance than the first resin.

The disadvantage of this is that the assembly of a corresponding motor vehicle headlight is expensive.

The object is therefore to further develop motor vehicle headlights and motor vehicles of the type mentioned at the outset such that a light source can be mounted in the motor vehicle headlight in a simpler and more durable manner.

The object is achieved by a motor vehicle headlight according to claim 1 and by a motor vehicle according to the independent claim 9. Further refinements and developments are the subject matter of the dependent claims.

A motor vehicle headlamp is described below with a housing that has a transparent and/or translucent cover, with at least one lamp being arranged on an adjustable holder in an interior space of the housing, with the holder having a bearing pin which is attached to at least one bearing arranged in the housing is mounted, the bearing having a bimetallic spring for generating a preload on the bearing journal.

With the help of the bimetallic spring, it is possible to enable permanent preloading in the bearing without oversizing the bearing components relative to one another. In addition, the bimetallic spring can be designed in such a way that, at a temperature outside the usual operating temperature range of such a motor vehicle headlight, it generates less prestress, which simplifies assembly.

In a first further development it can be provided that the bearing is an axial spherical plain bearing.

Such bearings can be manufactured inexpensively from plastic and can allow a component to be pivoted about a bearing axis or plane. In addition, together with a bimetallic spring, easy assembly can be achieved.

In another further development, it can be provided that the bimetallic spring is held in the bearing in a form-fitting manner.

For this purpose, for example, one or more slots can be provided in the bearing, into which the bimetallic spring is inserted. The bimetallic spring is thus held captive in the bearing.

In another further development it can be provided that the bimetallic spring is curved away from a bearing wall.

In this way, the bimetallic spring can be easily inserted and generate a preload.

A further development can provide that a bearing ball is arranged on the bearing journal.

This allows the holder, and thus the light source, to rotate in one plane.

In another further development, an adjustment mechanism for adjusting the optical axis of the motor vehicle headlight can be provided, with the bearing being part of the adjustment mechanism.

In a simple configuration, the adjustment mechanism can be mechanical. In a further development it can be provided that the adjustment mechanism is electrically driven.

According to a further development, it can be provided that an actuator for adjusting the holder relative to the housing is arranged on the holder.

In another further development, it can be provided that a recess for engagement with the bimetallic spring is arranged on the bearing journal.

In this way, the pin can be locked in the bearing.

A first independent subject relates to a motor vehicle with a motor vehicle headlight of the aforementioned type.

• 1 ein Kraftfahrzeug mit Kraftfahrzeugscheinwerfer;
• 2 einen Innenraum eines Kraftfahrzeugscheinwerfers aus 1;
• 3 eine Lagerung eines Halters gemäß einer ersten Ausführungsform;
• 4 eine vergrößerte Darstellung eines Ausschnitts aus 3;
• 5 eine Lagerung eines Halters gemäß einer zweiten Ausführungsform;
• 6 eine vergrößerte Darstellung eines Ausschnitts aus 5;
• 7 eine erste Lagerung gemäß dem Stand der Technik, sowie
• 8 eine zweite Lagerung gemäß dem Stand der Technik.

Further features and details emerge from the following description, in which at least one exemplary embodiment is described in detail—if appropriate with reference to the drawing. Described and/or illustrated features form the subject matter alone or in any meaningful combination, possibly also independently of the claims, and in particular can also be the subject matter of one or more separate applications. Identical, similar and/or functionally identical parts are provided with the same reference symbols. They show schematically:

• 1 a motor vehicle with a motor vehicle headlight;
• 2 an interior of a motor vehicle headlight 1 ;
• 3 a storage of a holder according to a first embodiment;
• 4 an enlarged view of a section 3 ;
• 5 a storage of a holder according to a second embodiment;
• 6 an enlarged view of a section 5 ;
• 7 a first storage according to the prior art, as well as
• 8th a second storage according to the prior art.

Identical or similar components are provided with the same reference symbols in the following for better readability.

1 shows a motor vehicle 2 with motor vehicle headlights 4.

The motor vehicle headlights 4 are headlights. The motor vehicle headlights 4 are each covered by a headlight glass 6 . The headlight lens 6 can be made of plastic and, in addition to its function as a cover for an 1 invisible headlight housing also have a beam-shaping effect.

The motor vehicle 2 is equipped with an automatic headlamp height adjustment in order to always comply with legal regulations with regard to the light output, regardless of the loading condition of the motor vehicle 2 .

2 shows an interior 8 of a headlight 4.

The headlight 4 has a housing 10 . In the housing 10 by the headlight glass 6 is covered, an adjusting mechanism 12 is arranged to realize the automatic headlight height adjustment.

A reflector 14 with an in 2 The illuminant that is not visible can be adjusted relative to the housing 10 by the adjustment mechanism 12 .

The reflector 14 is connected to the housing 10 via a bearing 16 . The bearing 16 is a thrust bearing.

The adjustment mechanism 12 has a controller 18 with the aid of which an actuator 20 can be actuated. The controller 18 can have position sensors, for example, which determine a current position of the motor vehicle 2 and allow the headlight 4 to be adjusted automatically.

3 shows a first embodiment of a bearing 16.

A bearing journal 22 is guided in a bearing shell 24 . A bimetallic spring 26 is arranged in the bearing shell 24 and generates a preload on the bearing journal 22 . As a result, the bearing pin 22 is guided in the bearing shell 24 without play.

A bore 28 is provided on the bearing journal 22 in order to connect the actuator 20 (not shown) and to move the reflector 14 (not shown).

4 indicates an enlargement 3 .

The bimetallic spring 26 is held in a form-fitting manner in slots 30 which are introduced into the bearing shell 22 . The bimetallic spring 26 is designed convex.

The bearing pin 22 has a recess 32 which causes a latching connection with the bimetallic spring 26 .

5 shows a second embodiment of a bearing 16'.

The bearing shell 24 is arranged on a bearing block 34 . The bearing block 34 is fixed in the housing 10 by means of clips 36 .

A bearing journal 22 is guided in a bearing shell 24 . The bearing journal 22 has a bearing ball 38 . A bimetallic spring 26 is arranged in the bearing shell 24 and generates a preload on the bearing journal 22 . As a result, the bearing pin 22 is guided in the bearing shell 24 without play.

The bearing pin 22 is connected to a reflector 14 on which a light source 40 is arranged.

6 indicates an enlargement 5 .

The bimetallic spring 26 is held in a form-fitting manner in slots 30 which are introduced into the bearing shell 22 . The bimetallic spring 26 is designed convex.

The bearing ball 38 has a recess 32 which causes a latching connection with the bimetallic spring 26 .

7 shows a bearing 116 from the prior art.

A bearing journal 122 is guided in a bearing shell 124 . For guidance without play, the clear width of the bearing shell 124 is less than the diameter of the bearing journal 122, so that an overlapping area 142 (shown in broken lines) is created.

8th Figure 12 shows another prior art bearing 116'.

A bearing journal 122 is guided in a bearing shell 124 . For guidance without play, the clear width of the bearing shell 124 is less than the diameter of the bearing journal 122, so that an overlapping area 142 (shown in broken lines) is created.

Although the subject matter has been illustrated and explained in more detail by exemplary embodiments, the invention is not restricted by the disclosed examples and other variations can be derived therefrom by a person skilled in the art. It is therefore clear that a large number of possible variations exist. It is also understood that exemplary embodiments are only examples and should not be construed as limiting in any way the scope, applications, or configuration of the invention. Rather, the preceding description and the description of the figures enable the person skilled in the art to concretely implement the exemplary embodiments, whereby the person skilled in the art, knowing the disclosed inventive idea, can make a variety of changes, for example with regard to the function or the arrangement of individual elements mentioned in an exemplary embodiment, without having to Leaving the scope of protection defined by the claims and their legal equivalents, such as further explanation in the description.

Reference List

2

motor vehicle

4

motor vehicle headlights

6

headlight glass

8th

inner space

10

Housing

12

adjustment mechanism

14

reflector

16, 16'

camp

18

steering

20

actuator

22

bearing journal

24

bearing shell

26

bimetallic spring

28

drilling

30

slot

32

recess

34

bearing block

36

clip

38

bearing ball

40

bulbs

116, 116'

camp

122

bearing journal

124

bearing shell

142

overlap area

Claims (9)

Motor vehicle headlight with a housing (10) which has a transparent and/or translucent cover (6), at least one illuminant (40) being arranged on an adjustable holder (12) in an interior space (8) of the housing (10), wherein the holder (12) has a bearing journal (22) which is mounted on at least one bearing (16; 16`) arranged in the housing (10), the bearing (16; 16`) having a bimetallic spring (26) for generating a preload on the bearing journal (22). Motor vehicle headlights claim 1 , wherein the bearing is a thrust bearing (16; 16'). Motor vehicle headlights claim 1 or 2 , the bimetallic spring (26) being held in the bearing (16; 16`) in a form-fitting manner. Motor vehicle headlight according to one of the preceding claims, in which the bimetallic spring (26) is curved away from a bearing wall. Motor vehicle headlight according to one of the preceding claims, a bearing ball (38) being arranged on the bearing journal (22). Motor vehicle headlight according to one of the preceding claims, wherein an adjustment mechanism (12, 20) is provided for adjusting the optical axis of the motor vehicle headlight (4), the bearing (16; 16`) being part of the adjustment mechanism (12, 20). Motor vehicle headlight according to one of the preceding claims, wherein an actuator (20) for adjusting the holder (12) relative to the housing (10) is arranged on the holder (12). Motor vehicle headlight according to one of the preceding claims, wherein a recess (32) for engagement with the bimetallic spring (26) is arranged on the bearing journal (22). Motor vehicle with a motor vehicle headlight (4) according to one of the preceding claims.

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