Patent ID: 7584738
Filing Date: 2009-09-08
Classification: F16F,Y10T

Abstract:
1. A rotary shaft for rotation about an axis and carrying a substantial circular radially extending flange having a circumferential outer surface, said circular flange having an axis which is parallel to and offset from said axis of said rotary shaft, a housing connected to said outer surface of said flange, said housing defining a cavity, said cavity having radially inner and radially outer cylindrical surfaces, said radially inner and outer cylindrical surfaces having axes which are offset from one another and which are both parallel to said axis of said rotary shaft, an inertia mass within said cavity, said mass having radially inner and radially outer cylindrical surfaces, said radially inner and outer cylindrical surfaces having axes which are offset from one another and which are both parallel to said axis of said rotary shaft, said radially inner cylindrical surfaces of said inertia mass and of said cavity forming a first facing pair of surfaces, said radially outer cylindrical surfaces of said inertia mass and of said cavity forming a second facing pair of surfaces, one of said facing pairs of surfaces constituting bearing surfaces guiding motion of said inertia mass, the other of said facing pairs of surfaces being spaced apart to define a space accommodating a displaceable material, said inertia mass and said cavity having dimensions in the radial direction which has a maximum value at a first position opposite to the direction of eccentricity and which decreases progressively in both circumferential directions to a second position offset by 180 ° degrees from the first position, and said inertia mass and said cavity having relative dimensions to allow said inertia mass limited movement in rotation with respect to said cavity.