DE102006023962A1 - Planetary gearing with a positive fit for operating very precise adjusting gears has an eccentric wheel on a sun wheel and a curved disk to run along on roller bodies fixed firmly on a mount - Google Patents

Abstract

A first circular disk (2) fits eccentrically/off- center as a sun wheel on a drive shaft (1). Second circular disks (3) fit eccentrically/off-center on a stay (4) so as to rotate. Curves (5) are fixed firmly on a mount. When a drive shaft rotates, the second circular disks roll off on the first circular disks and on a curve on the mount. Independent claims are also included for the following: (1) Three-wheel planetary gearing; (2) Four- wheel planetary gearing.

Description

such Transmission systems with an eccentric on the sun gear and a cam, the are guided along frame-mounted rolling elements, are under the name of the inventor Braren or under the trade name "Cyclo-gear" well known.

Also the so-called "flex spline transmission" with a flexible Toothed belt, which from an excentric drive body into a frame-fixed Sprocket pressed is known as a low-backlash gearbox.

Also other systems for "backlash-free" (low backlash) transmissions are known.

One major disadvantage of such transmission is that they either only for high translations are suitable, are expensive to manufacture or still due to lack of rigidity a game of a few minutes of arc exhibit.

Here The invention aims to remedy this. The invention as characterized is, enables high-precision actuating gear in the integer translation area from 1: 3 to about 1:36.

This is achieved by a on the drive shaft excentrically arranged circular disc on a rotatable web excentrically rotatably mounted planetary disks turns, which engage in special curves in the housing and roll it off.

The invention with its embodiments is based on the 1 - 8th explained.

1 shows the basic principle after the construction of a "three-wheel planetary gear". 1 ) are first eccentric circular disks ( 2 ), which second circular disks ( 3 ), which on a coaxial to the drive shaft ( 1 ) rotatable bridge ( 4 ) excentric about a rotation axis ( 6 ) are rotatably mounted, in a housing-fixed curve ( 5 ) to press.

When turning the drive shaft ( 1 ) roll the first discs ( 2 ) on the second circular discs ( 3 ) and press into the frame curve ( 5 ) at which they turn around.

In the 1 and 2 is assumed a significantly too high eccentricity of the circular disks, which leads to a high sliding content in the rolling.

On the basis of this exaggeration of the excentricity, however, the force effect of the system becomes clear. Assume the drive rotor is turning counterclockwise. Then the upper right planetary disc ( 3 ) circular about its axis of rotation ( 6 ) against the frame side edge ( 5 ), whereby a rotational force on the web ( 4 ) acts.

The contact edges between the first circular disc ( 2 ) and second disc ( 3 ) and between the second disc and frame are at a certain angle, so that the resulting force vector acts tangentially on the web and generates a rotational force.

In 2 is sketched a moving picture of this basic principle. Only on the supporting cylinder, the torque acts on the bridge. By mirror image arrangement of the cylinder, a radial force compensation is given to the output shaft. There are no tangential forces acting on the web over the neutral cylinders and the towed cylinders.

3 outlines the possibility with the help of rolling bearings ( 10 ) to avoid the sliding of the planet gears on the frame.

4 shows the structure of a system according to the invention with the translation rate 1: 6 and the 5 the moving pictures of this system. One recognizes the simple and compact construction possibilities. This system is designed according to the principle of the "four-wheel planetary gear", whereby the planetary diameters can be better adapted to the rolling length of the sun gear and the frame.Then the wheels can be used according to the principle "rolling length at the sun = rolling length at the first planetary gear" and "rolling length at the top end" Frame = set rolling length on the second planetary gear ".

6 shows a system for oil-free operation also as vierrädriges planetary gear. Here are different Wälzflächen of planetary and drive shaft and planetary gear and frame given, with any unavoidable by the eccentricity of the planetary gears on the frame are intercepted by a rolling bearing.

7 shows a system of the ratio 1: 9 also designed according to the principle of the four-wheel planetary gear.

8th shows a way to further improve the uniformity of the torque at the web. By rotating the planet gears of one side to the other by a few degrees from the mirror image movement, the sinusoidal force effects are better balanced.

Claims (6)

Planetary gear with a drive shaft, a web rotatable coaxially to the drive shaft and a frame, which according to the principle of dreiräd rigen planetary gear or the four-wheel planetary gear is constructed, characterized in that on the drive shaft ( 1 ) circular or elliptical first discs ( 2 ) are arranged eccentrically, which with circular or elliptical second discs ( 3 ), which are eccentric at the footbridge ( 4 ) are rotatably arranged, are in permanent contact with each other and the second discs ( 3 ) simultaneously in permanent contact with a frame-fixed closed curve ( 5 ) and the individual parts act on each other so that upon rotation of the drive shaft, the first discs on the second discs and the second discs forcibly guided on the housing curve ( 5 ) and roll the second discs around their axis of rotation ( 6 ) are turned on the bridge. Planetary gear according to claim 1, additionally characterized in that two or more by an equal pitch (180 °, 120 ° or even smaller) twisted to each other first discs ( 2 ) and curves ( 5 ) with respectively associated web-fixed second disks ( 3 ) are arranged axially next to each other and the first discs ( 2 ) rotatably with the drive shaft ( 1 ) are connected. Planetary gear according to claim 2, additionally characterized in that the waves of the second discs of unequal pitch ( 13 ) are arranged on the bridge. A three-wheel planetary gear according to any one of claims 1-3, further characterized in that the second discs are circular and have a rolling bearing (10) disposed about said discs ( 10 ) are in touching contact with the first disk and the housing curve. A four-wheel planetary gear according to any one of claims 1-3, additionally characterized in that the second discs ( 11 . 12 ) consist of two circular disks of different diameters, the first of which ( 12 ) rolls on the first disc and the second ( 11 ) rolls on the frame curve. A four-wheel planetary gear according to claim 5, additionally characterized in that the first ( 12 ) or the second ( 11 ) or both roll with a rolling bearing at its contact surface.