Horizontal directional drill with freewheel mode
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United States of America Patent
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Oct 8, 2024
Grant Date -
Sep 28, 2023
app pub date -
Sep 15, 2022
filing date -
Mar 28, 2022
priority date (Note) -
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status (Latency Note)
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Abstract
A horizontal directional drilling machine includes a drill string rotational drive unit having an output member configured to connect with and selectively drive rotation of a drill string, the rotational drive unit including a hydraulic motor. A hydraulic circuit has a configuration that puts the motor in a drive mode to apply torque and a second configuration that puts the motor in a freewheel mode disabled from applying torque. The hydraulic circuit includes a first fluid flow path for connecting the hydraulic motor through a first rotary ball valve to one of an inlet side and an outlet side of a drive pump, and a second fluid flow path for selectively connecting the hydraulic motor through a second rotary ball valve to the other side of the drive pump. In the first configuration, there is no pressure drop across the first and second rotary ball valves.
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