HYDRAULIC HYBRID CIRCUIT WITH ENERGY STORAGE FOR EXCAVATORS OR OTHER HEAVY EQUIPMENT
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United States of America Patent
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app pub date -
Oct 22, 2015
filing date -
Oct 22, 2015
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Abstract
A hydraulic system powered by a shaft of an engine to control a plurality of hydraulic cylinders including at least one boom lift hydraulic cylinder coupled to a boom to pivot the boom about a horizontal axis, wherein a first variable displacement pump/motor and a second variable displacement pump/motor can be connected to provide a higher flow to the at least one boom lift hydraulic cylinder than a flow achieved by one of the first variable displacement pump/motor or the second variable displacement pump/motor, and a high-pressure accumulator and the first variable displacement pump/motor and the second variable displacement pump/motor can add power back to the engine shaft.
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