Patent ID: 6656076
Filing Date: 2003-12-02
Classification: B60N,F16H

Abstract:
A primary transmission for motors operating at high rpm for auxiliary drive units, the primary transmission comprising:a housing; a drive shaft projecting into the housing; a first eccentric disc mounted in the housing so as to be coupled in a fixed driving connection with the drive shaft; an internal ring gear stationarily mounted in the housing concentrically to the drive shaft; a first spur gear supported on the first eccentric disc, the first spur gear configured to act as a first drive member; the first spur gear having an outer toothing cooperating with an inner toothing of the internal ring gear at a location of engagement; the first spur gear having teeth and the internal ring gear having teeth, wherein the first spur gear has at least one tooth less than the internal ring gear; wherein a circle extending through the end of the teeth of the first spur gear has a first diameter and wherein a circle extending through the base of the teeth of the internal ring gear has a second diameter, wherein the first diameter is smaller by at least one tooth height than the second diameter; wherein the first eccentric disc has an eccentric lift relative to a center of the drive shaft corresponding to half a (difference between the first and the second diameters; a driven disc forming a second drive member and arranged concentrically to the drive shaft, the second drive member torque-transmittingly connected to the first spur gear; wherein the second drive member has a plurality of axially projecting pins and wherein the first drive member has a plurality of receiving bores wherein the axially projecting pins engage the receiving bores; the receiving bores having a bore diameter and the axially projecting pins having a pin diameter, wherein the bore diameter is greater by the eccentric lift of the eccentric disc than the pin diameter; at least one second eccentric disc mounted in the housing axially adjacent to the first eccentric disc so as to be coupled in a fixed driving connection with the drive shaft, wherein the at least one second eccentric disc is identical to the first eccentric disc and is configured to compensate mass, wherein the eccentric nose of the first eccentric disc and the eccentric nose of the second eccentric disc are positioned diametrically opposite one another; a second spur gear supported on the second eccentric disc and having a size matching the size of the first spur gear and engaging the internal ring gear, wherein the first eccentric disc with the first spur gear is positioned directly adjacent to the second drive member and the second eccentric disc with the second spur gear is positioned on a side of the first spur gear remote from the second drive member, and wherein the second spur gear is not connected to the axially projecting pins.