초록 ▼

A speed reduction mechanism having an orbital drive system. A first crank arm drives the orbital system and a second crank arm, offset by 180 degrees, carries a counterweight for counter balancing the off center forces produced by the orbital system. To minimize inertia, the counterweight is symmetr

A speed reduction mechanism having an orbital drive system. A first crank arm drives the orbital system and a second crank arm, offset by 180 degrees, carries a counterweight for counter balancing the off center forces produced by the orbital system. To minimize inertia, the counterweight is symmetrically shaped about its axis and is mounted for free rotation about the second crank arm. Such a counterweight may have a smaller degree of eccentricity and a correspondingly greater mass than a conventional counterweight, but because the inertia is a function of the square of the eccentricity of the counterweight, the inertia may be significantly less.

대표청구항 ▼

In a speed reducing mechanism comprising an orbital rotor assembly having a perimeter defined by an epitrochoid curve, a set of rollers positioned in a circle and arranged respectively to operatively engage said perimeter of said rotor assembly, a drive shaft, and a first eccentric means connected t

In a speed reducing mechanism comprising an orbital rotor assembly having a perimeter defined by an epitrochoid curve, a set of rollers positioned in a circle and arranged respectively to operatively engage said perimeter of said rotor assembly, a drive shaft, and a first eccentric means connected to said drive shaft and arranged to drive said rotor assembly in an orbital path, a counter balance mechanism including a second eccentric means including a countershaft connected to said drive shaft and offset 180 degrees from said first eccentric means, and a counterweight rotatably mounted on said countershaft and having its mass symmetrically distributed about the axis of said countershaft.