Power assist hydraulic steering system with on demand pump
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United States of America Patent
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Dec 6, 2016
Grant Date -
Oct 30, 2014
app pub date -
Jul 7, 2014
filing date -
May 15, 2008
priority date (Note) -
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Abstract
A power assist hydraulic steering system comprises a helm pump hydraulically connected to a first hydraulic actuator. A power assist pump is hydraulically connected to a second hydraulic actuator. The first and second hydraulic actuators are coupled. A flow sensing mechanism is disposed along a hydraulic conduit which hydraulically connects the helm pump to the first hydraulic actuator. The flow sensing mechanism senses when fluid flows from the helm pump to the first hydraulic actuator. A motor actuates the power assist pump when the flow sensing mechanism senses that fluid is flowing from the helm pump to the first hydraulic actuator. In one embodiment the first hydraulic actuator is a servo cylinder and the second hydraulic actuator is a drive cylinder.
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