Oechsler Aktiengesellschaft

Martin Ruttor

Marco Wacker

Wilhelm Wolf

Winfried Schmidt

Jürgen Heinz

Joseph Bögelein

Axel Vogelhuber

Gisela Fuchs

An adjustment device for a carrier plate which can be pivoted about two mutually orthogonal axes and is configured to receive a motor vehicle mirror, includes one motor per axis for moving a non-rotatably and non-tiltably guided linear drive, which is in engagement via a socket with a joint ball on the carrier plate, and a funnel-shaped hub provided with a hollow shaft. A hollow spherical segment of the funnel-shaped hub engages, by spring tabs, in a depression in the form of a hollow spherical segment in the carrier plate, and a spherical segment of the carrier plate is axially elastically clamped in a hollow spherical segment of a housing for drive trains of the two linear drives, thereby locking the hollow shaft on the housing.

Adjustment device for a pivotable carrier plate

The refinement of such harmonic drives according to German Patent 1 98 33 290 C1&equals;European Patent Application 0 974 773 A concerns damping of the noise generation as a consequence of the revolving displacement of discrete tappets (instead of the rotating deformation of the closed hub of a spoked wheel) on the non-round wave generator. Since the feet of the individual&mdash;not guided in a cage, but rather connected to one another by a flexible ring band&mdash;tappets are no longer solid, but rather split, they are to be able to elastically bend so they may press continuously against the drive core of the wave generator. The peripheral connection of the neighboring tappets via the ring band, which is thin in comparison to their diameters, is to be laid out in such a way that a spring effect is achieved, using which the tappet&mdash;even in the course of instantaneous reduction in diameter as the drive core, which is oval in cross-section, rotates out of the angular region of its greatest diameter&mdash;is always kept radially pressing snugly against the non-round wave generator in order to, in this way, suppress a noise-generating radial rebound from a displacement position which is still radially lifted.

Harmonic drive and internal geared wheel for a drive of this type

A shaft drive ( ), which may be produced without problem and easily&mdash;even in a cascade&mdash;assembled, may be achieved, whereby the support ring ( ) produced such as to be floating relative to the housing is rotationally fixed on the front side to a housing base plate ( ) and enclosed by a housing cover ( ), similarly fixed to the base plate ( ), in which the drive shaft ( ) for the crowned drive ring ( ), which may rotate relative to the support ring ( ), has a floating bearing. The inner wheel ( ), extending through both rings is however not supported in the housing, but rather mounted on the drive shaft ( ) extending coaxially into the housing ( ) through the base plate ( ), by means of the wave generator drive core ( ), the base plate (12) being non-rotationally mounted in front of the bearing plate ( ) of the above.

Harmonic drive with crowned drive ring

The star-shaped internal geared wheel ( ) of a harmonic drive ( ) consists of individual tappets ( ) which are displaceably interconnected by a retainer ring ( ) which circles them at approximately half the height of the tappet shaft, so that they form a single part that can be handled. The inner front end ( ) of the tappet shaft, which is thermally dimensionally stable, is provided with a guiding shoe or at least provided with a slide-resistant coating opposite a radially elastically compressible head ( ). The internal geared wheel ( ) is produced as a one-part plastic injection-moulded element in a multiple component method, with a thermally dimensionally stable foot ( ), support ring arms ( ) which are elastically moulded onto the respective dimensionally stable and extremely resistant tappet shaft and head walls ( ) consisting of different plastics.

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Ansbach, Germany

Martin Ruttor