Patent ID: 6450913
Filing Date: 2002-09-17
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 at least one of the first and second drive members has at least one axially projecting pin and wherein the other of the first and second drive members has at least one receiving bore; the at least one receiving bore having a bore diameter and the at least one axially projecting pin 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 engaging the inner toothing of the internal ring gear, the second spur gear configured to act as a transmission member between the first drive member and the second drive member, wherein the second spur gear has at least one receiving bore configured to receive the at least one axially projecting pin supported on the first drive member and having at least one axially projecting pin configured to engage a receiving bore of the driven disc forming the second drive member; wherein the first spur gear has a number of the axially projecting pins distributed at uniform angular spacing on a first circle concentric to a bearing location of the first spur gear, and wherein the second spur gear has a number of the receiving bores matching the number of the axially projecting pins, wherein the axially projecting pins engage the receiving bores, respectively, and wherein the second spur gear has additional ones of the axially projecting pins arranged between the receiving bores and projecting away from the first spur gear, wherein the second drive member is concentric to the drive shaft and has several of the receiving bores matching the number of additional axially projecting pins and engaging the additional axially projecting pins.