Hydraulically-driven concrete finishing trowel having hydraulic fluid cooling system and method
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United States of America Patent
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Apr 25, 2017
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app pub date -
Feb 9, 2016
filing date -
Feb 9, 2016
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Abstract
A hydrostatically power self-propelled concrete finishing trowel has at least two coolers in a cooling system of the machine's hydraulic circuit. In the most typical case in which the first cooler is a closed loop oil cooler, the second cooler may take the form of an open loop oil cooler disposed in a flow path connecting one or more low-pressure outlets of the hydrostatic drive system to a reservoir. The closed loop oil cooler actively drops the temperature within the trowel's hydrostatic drive system, while the open loop oil cooler supplements that cooling by reducing the oil temperature in the reservoir.
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