Importance

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Abstract

An eccentric bearing arrangement including counterweights used in the hydraulic pump of an anti-lock brake system. The invention is directed to an apparatus which provides an eccentric motion applied through an essentially non-rotating outer bearing and a counterweight to a designed eccentricity in order to diminish vibration caused by the eccentric element. Embodiments of the invention are for use in anti-skid brake system pumps that require a pulsating, eccentric load that is ultimately applied to a set of radially disposed hydraulic plungers. The apparatus of the present invention comprises an outer ring, an inner ring mounted on a drive shaft, and an outer roller bearing disposed in the raceway formed between the inner and outer rings. The raceway of the inner ring is eccentric to the drive shaft by an amount equal to one half the design stroke of the anti-lock brake system plungers. The outer ring is in direct contact with the hydraulic plunger faces. The eccentrically rotated mass of the outer bearing and the inner ring are counterweighted by a thin disc slug counterweight or a steel ball counterweight, with the counterweight located such that the mass and radius of gyration provide optimum vibration reduction.

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First Claim