Illumination – Vehicle steering mechanism or element moves pivoted lamp or... – Tie rod element controlled
Patent
1990-06-27
1991-12-03
Lazarus, Ira S.
Illumination
Vehicle steering mechanism or element moves pivoted lamp or...
Tie rod element controlled
362271, 362286, 362287, 362428, F21M 322
Patent
active
050704338
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a headlight for a motor vehicle.
A headlight for a motor vehicle having an adjustable motor-driven reflector is known from DE-PS 30 48 751. The headlight is provided with an electromotive adjusting device for adjusting the inclination of parts of the headlight. The adjusting device is accommodated in its own housing and comprises an electric motor and a step-down gear unit. The housing with the adjusting device is attached to the rear side of the headlight housing with a supporting frame. The step-down gear unit of the adjusting device is connected with the parts of the headlight to be adjusted via a coupling element.
The disadvantage of this headlight is that a very deep installation space is required for the headlight because of the separately mounted housing of the adjusting device. In order to protect the adjusting device from soiling, it is necessary to take steps for sealing at the housing. Other disadvantages consist in that the headlight housing must comprise required special fastening elements for attaching the housing and a separate cable guide is required for the electrical connection of the electric motor.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an inclination-adjustable headlight for a motor vehicle, which is more compact than the current inclination-adjustable headlight and whose inclination-adjusting mechanism is sealed to prevent soiling.
The headlight, according to the invention, with the characterizing features of the main claim, has the advantage that the housing part receiving the adjusting device is arranged within the headlight housing, so that the installation depth of the headlight is reduced and no sealing of the housing part is required.
An advantageous integrated arrangement of the step-down gear unit in the housing part with few individual parts to be mounted is possible. In this arrangement the step-down gear unit of the adjusting device has a small worm gear, which is driven by an electric motor and is oriented transversely relative to the longitudinal axis of the headlight and a toothed wheel having radially disposed external teeth coaxially positioned with respect to the longitudinal axis, which engages with the worm gear. The toothed wheel also has a bore hole which extends in the axial direction and has an internal thread, while the housing part has a journal which projects in the axial direction toward the toothed wheel and which has an external thread. The toothed wheel thus is engaged on the journal so s to move axially as it rotates about the journal. The toothed wheel is connected with the reflector on its end remote from the housing part via an adjusting element. This adjusting element can be cylindrical extending axially of the toothed wheel, which has an external thread on which an articulated part coupled rotatably with the reflector is screwed, however the thread between the articulated part and the shaft runs opposite to the thread between the toothed wheel and the housing part. An increased adjusting range is achieved in the headlight by means of the construction of the connection of the step-down gear unit with the articulated part. Further features according to the invention enables a basic adjustment of the headlight from outside the headlight housing. The position of the part of the step-down gear unit connected with the headlight reflector is determined in a simple manner by providing a potentiometer oriented in the axial direction in the housing part in the vicinity of the toothed wheel and connected with the toothed wheel via a stirrup and also providing a slip ring on the exterior of the housing part and a slider on the inside of the headlight housing opposite the slip ring for contact of the electric motor and potentiometer. The electric motor and the potentiometer are connected with the slip ring via electric lines and a printed circuit board.
BRIEF DESCRIPTION OF THE DRAWING
The object, features and advantages of the present invention will now be
REFERENCES:
patent: 4186428 (1980-01-01), Deverrewaere
patent: 4217631 (1980-08-01), Bergkvist
patent: 4916587 (1990-04-01), Hirose et al.
patent: 5010457 (1991-04-01), Ohmauyuda et al.
Ebinger Georg
Hasselmann Heinrich
Haug Kurt
Millers Miervaldis
Speer Harald
Cole Richard R.
Lazarus Ira S.
Robert & Bosch GmbH
Striker Michael J.
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