Centrifugal pendulum vibration absorber

摘要

A centrifugal pendulum vibration absorber (CPVA) for absorbing torsional vibration created by operation of an engine includes a plurality of pendulums moveable with respect to a rotatable shaft. The pendulums are connected to the rotatable shaft by a plurality of pins that extend through apertures in the pendulum. The pendulums each move along a path defined by various drive line or powertrain parameters and characteristics. The path is implemented by contouring an active section of the apertures that engage the pins.

主权项

1. An apparatus disposed between an engine that produces torque oscillations during engine revolution and a transmission, the apparatus comprising:
a plate having a rotational axis and interconnected to the engine and interconnected to the transmission; at least one cylindrical member fixedly connected to the plate; and at least one mass member having a center of mass and having an aperture, wherein the cylindrical member is disposed through the aperture to support the mass member on the plate, wherein the aperture is defined by an inner surface having an active portion, wherein the active portion defines a movement path of the mass member around the rotational axis when the plate is rotating, and wherein the active portion has a contour defined on a Cartesian coordinate system that is a function of a tuning variable, first and second variables based on a torque oscillation order of the engine, an angular displacement of the mass member, and a radius of the cylindrical member, and wherein the active portion has a contour defined on a Cartesian coordinate system by the following equations:ϰ=b⁡(1+k1⁢φ2+k2⁢φ4)⁢cos⁡(φ)+r⁢{b⁡(2⁢k1⁢φ+4⁢k2⁢φ3)⁢sin⁡(φ)+b⁡(1+k1⁢φ2+k2⁢φ4)⁢cos⁡(φ)}{(b⁡(2⁢k1⁢φ+4⁢k2⁢φ3))2+b2⁡(1+k1⁢φ2+k2⁢φ4)2⁢(φ)}y=b⁡(1+k1⁢φ2+k2⁢φ4)⁢sin⁡(φ)+r⁢-{b⁡(2⁢k1⁢φ+4⁢k2⁢φ3)⁢cos⁡(φ)-b⁡(1+k1⁢φ2+k2⁢φ4)⁢sin⁡(φ)}{(b⁡(2⁢k1⁢φ+4⁢k2⁢φ3))2+b2⁡(1+k1⁢φ2+k2⁢φ4)2⁢(φ)} where x and y are coordinates on the Cartesian coordinate system that define the active portions at a given angular displacement, b is a tuning variable, K1 and K2 are first and second variables based on a torque oscillation order of the engine, respectively, and φ is the angular displacement of the center of mass about the axis of rotation during one full rotation of the plate, and wherein the tuning variable b is defined in the following equation:Rb=λ⁢⁢n2 where n is an integer that is defined as the number of engine torque oscillations per every engine revolution, R is a distance between the rotational axis and an origin of the Cartesian coordinate system, and λ is a dynamic variable dependent on dynamic characteristics of the engine and the transmission, wherein the cylindrical member is disposed on the plate such that when the cylindrical member is located in the center of the active portion the distance from the center of mass of the mass member to the rotational axis is equal to the radius of the cylindrical member plus a distance from the rotational axis to an origin of the Cartesian coordinate system, and wherein as the plate rotates, the mass member absorbs a portion of the torque oscillations through the plate from the engine to the transmission as the mass member moves along the movement path.