JPS6341774B2 - - Google Patents

Abstract

Each axle of the vehicle is provided with a respective pressure modulator (15, 16) connected to the intake manifold (21) and in dependence on changes in the distance of a respective axle (18, 20) from the vehicle superstructure the modulators (15, 16) regulate the application of a control pressure to headlight adjusting servomotors (6). Each servomotor (6) contains a working piston (3) which is spring loaded to shorten the illumination range in the event of system failure, the piston (3) being located in the working chamber (5) by a diaphragm (4). The system includes a correction element comprising a pressure modulator (13) connected to manifold (21) and a servomotor (14) which is connected to modulators (15, 16) and causes modulator (13) to feed to each headlight adjusting servomotor (6) a pressure determined by the instantaneous condition of the vehicle suspension. In a modified embodiment modulator 15 is connected to modulator 16 through a simplified correction element and modulator 16 is connected directly to servomotors 6. <IMAGE>

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides a modulator for each of the front axle and the rear axle to adjust the control pressure in relation to changes in the distance between the respective axle and the body of the vehicle. and this control pressure acts as a control variable on at least one headlamp operating motor to adjust the direction of a motor vehicle headlamp coupled to this headlamp operating motor, thereby adjusting the direction of the headlamp. Keep the illumination range of the light constant,
In addition, a correction element is provided which is controlled by a modulator attached to one axle and, in cooperation with a modulator attached to the other axle, is adapted to control the different axle-body distance changes of both axles accordingly. The present invention relates to a pneumatically operated automatic steering device for a motor vehicle headlamp which supplies pressure to a headlamp operating motor.

[Conventional technology]

Such an adjusting device is covered by German Patent No.
A correction element, which is known from DE 2054644 and which is acted upon by both axle modulators, is associated with the headlamp adjustment device. In order to carry out adjustments relating to both axles, this correction element is constructed as an operating motor receiving air pressure on both sides from both axle modulators;
Controls the supply pressure to the headlamp operating motor according to the differential pressure. A compensating element configured as an operating motor receiving air pressure on both sides is complex in construction and therefore expensive; it also requires an additional control for controlling the supply pressure to the headlamp operating motor in response to the mechanical displacement of the compensating element. equipment is also required.

[Problem to be solved by the invention]

The object of the invention is to provide a highly reliable and automatically operating adjusting device with as few parts as possible and therefore advantageous manufacturing costs.

[Means to solve the problem]

In order to solve this problem, according to the invention, the correction element is designed as an actuating motor which receives air pressure only on one side and mechanically transmits changes in the axle-body distance of the other axle to a modulator associated with this axle. The modulator is inserted into a mechanical transmission device to control the modulator.

〔Effect of the invention〕

Thus, according to the present invention, the correction element is formed as an operation motor that receives air pressure only on one side, rather than as an operation motor that receives air pressure on both sides as in the prior art, so that the structure of the correction element is simplified. and a correction element controlled by a modulator associated with one axle is inserted into a mechanical transmission device for mechanically transmitting changes in the axle-body distance of the other axle to a modulator associated with this axle, Since this modulator controls the supply pressure to the headlamp operating motor, there is no need for an additional device to control the supply pressure to the headlamp operating motor as a function of the pressure difference as in the past. Therefore, the number of parts is reduced, and the number of pneumatic piping is also reduced accordingly, making the structure of the entire adjustment device simpler and cheaper.

〔Example〕

The invention will be further explained with reference to the embodiments shown in the drawings.

Each automobile headlamp 1 housed in a lighting device (not shown) includes a reflecting mirror 2 that is swingably supported.
The reflector 2 is connected to a spring-loaded working piston 3, as shown in cross-section.
This operating piston 3 together with a diaphragm 4 defines an operating space 5 within the operating motor 6 . Each operating motor 6 is held in a swingably mounted holder 7, which has at its upper end 8 a setting device 9 for basic setting of the reflector 2. The two working spaces 5 are connected to each other via a conduit 10. Another conduit 11 branches off from this conduit 10,
The modulator 1 forms one structural unit together with the actuating motor as a correction element 14 near the rear axle.
6 leads to exit 12.

In addition to the modulator 16, there is also one further modulator 15
However, both modulators have the same structure in principle. Modulator 15 is link mechanism 1
7 to a front axle 18 , and the modulator 16 is likewise connected to a rear axle 20 via a linkage 19 . The modulators 15 and 16 are supplied with negative pressure taken out from an intake pipe 21 of an internal combustion engine (not shown). A check valve 23 and a pressure reservoir 24 are provided in the conduit 22 emerging from the intake pipe 21 . If a pump (not shown) is used as the negative pressure supply device, these elements 23 and 24 may be omitted.
A branch conduit 25 from the conduit 22 is connected to the inlet 2 of the modulator 15.
6 and an inlet 29 of the modulator 16 .

Each modulator 15 or 16 has a floatingly supported plate 30 which, on the side opposite the outlet 12, has a sealing plate 31 which in the inactive state and the inlet 26 or 29, so that the annular gap 32 between this inlet 26 or 29 and the respective plate 30 is closed. This configuration separates the spaces 33 and 34 on either side of the plate 30 from each other. The latter space 34 opens to the outside air.

When the front axle 18 approaches the vehicle body and reduces the distance from the vehicle body, so that the front of the vehicle body is directed downwards, the control spring 35 is activated via the link mechanism 17 connected thereto.
The detector 36 hits the link mechanism 17 under the action of
is moved upwards, which causes the plate 30 to also move upwards. In this case, the sealing plate 31 continues to rest against the plate 30, so that a connection is established from the space 33 to the inlet 26 via the annular gap 32. In this way, the negative pressure in the space 33 increases until the plate 30, which returns against the pressing force of the control spring 35, reaches the same plane as the intake inlet and is sealed by the sealing plate 31.

As the front axle 18 moves away from the vehicle body to increase its distance from the vehicle body, and thus the front of the vehicle body points upwards, the plate 30 moves downwardly. The sealing plate 31 continues to cover the intake inlet, but is moved away from the plate 30 so that an annular gap 32
A connection is made from space 33 to space 34 via. The plate 30 therefore returns to its initial position again.
The negative pressure in the space 33 decreases until it hits the sealing plate 31.

The correction element 14 is configured as an actuating motor that receives air pressure on one side only and has an operating space 47 delimited by a spring-loaded diaphragm 46 , which is connected via a conduit 48 to an outlet 49 of the modulator 15 . has been done. The link mechanism 19 , in which the correction element 14 is inserted in the part emerging from the rear axle 20 , forms a device 50 for detecting changes in the distance of the rear axle 20 relative to the vehicle body and transmitting the same to the detector 36 of the modulator 16 .

When the front axle 18 approaches the vehicle body, the space 33 of the modulator 15 and therefore the working space 4 of the correction element 14
Since the negative pressure value within the vehicle 7 increases, the link portion of the link mechanism 19 that is closer to the rear axle 20 becomes shorter.
As a result, the plate 30 of the modulator 16 moves downwards and the negative pressure value in its chamber 33 increases. The operating piston 3 of the operating motor 6 is thereby moved to the right, tilting the reflector 2 backwards so as to increase the illumination range. The correction element 14 can thus control the modulator 16 in response to the control operation of the modulator 15 . When the front axle 18 moves away from the vehicle body, a reduction in the illumination area takes place, contrary to the course described above.

Even if the distance between the rear axle 20 and the vehicle body changes,
Correction element 14 does not operate. When both axles change their distance from the vehicle body in parallel, the effective length of the link mechanism 19 closer to the axle shortens or expands, so a change in distance of the same magnitude with the same orientation of the rear axle 20 relative to the vehicle body is adjusted. Do not trigger the process. Only in the case of different spacing variations is the illumination range adjusted as a function of the vehicle body inclination about the transverse axis of the vehicle.

Although not shown, it is also possible to combine the modulator 16 and the correction element 14 into one structural unit, in which case the switching movements of the correction element 14 are transmitted directly to the integrally mounted modulator 16.

[Brief explanation of the drawing]

FIG. 1 is a connection diagram of an embodiment of a headlamp direction adjustment device according to the present invention. 1... Headlight, 6... Operation motor, 15, 16
... Modulator, 14 ... Correction element, 18 ... Front axle, 20 ... Rear axle, 50 ... Sensing-transmission device.

Claims (1)

[Claims] 1. A modulator is attached to each of the front axle and the rear axle to generate a control pressure in relation to a change in the distance between each axle and the vehicle body, and this control pressure is used as a control variable. affecting at least one headlamp operating motor to adjust the direction of a motor vehicle headlamp coupled to the headlamp operating motor, thereby maintaining a constant illumination range of the headlamp; A correction element is provided which is controlled by a modulator associated with one axle and, in cooperation with a modulator associated with the other axle, adjusts the control pressure accordingly for different axle-body distance changes of both axles. In what is supplied to the headlamp operation motor, the correction element 14
is formed as an actuating motor which receives pneumatic pressure only on one side and is inserted into a mechanical transmission device 50 which mechanically transmits changes in the axle-to-vehicle distance of the other axle 20 to the modulator 16 associated with this axle, An automatic direction adjustment device operated by the air pressure of an automobile headlamp, which controls the modulator 16. 2. Device according to claim 1, characterized in that the correction element 14 changes the effective length of the transmission path of the mechanical transmission device 50. 3. Device according to claim 1, characterized in that the correction element 14 and the modulator 16 controlled thereby form one structural unit.