System for supplying heat to construction equipment cab
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United States of America Patent
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-
Dec 9, 2014
Issued Date -
N/A
app pub date -
Apr 2, 2009
filing date -
Apr 2, 2009
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An apparatus is provided that quickly elevates and maintain a construction equipment engine coolant to operating temperature in order to lower the dwell time for the operator's cab to reach a comfortable temperature level during a period when the engine is in idle and main crane functions are not operated. The apparatus includes an auxiliary hydraulic circuit for rapidly bringing engine coolant temperature up to operating temperature. Engine coolant operating temperature is achieved by inducing a hydraulic load to the engine. By inducing a hydraulic load, a horsepower load is exerted on the engine causing the engine to generate heat sufficient to raise the engine coolant to operating temperature for heating the cabin. A pressure reducing relieving valve and a pilot operated relief valve result in precise hydraulic horsepower load to the construction equipment engine. Operation of the pilot operated relief valve also warms hydraulic fluid for a hydraulic reservoir.
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