| 摘要 |
A wrench assembly including a drive head and an attached socket for engaging a bolt or nut. When the drive head turns, the socket and any engaged threaded member will also rotate. A hydraulic motor and cylinder are also included. The hydraulic motor and cylinder rotate the drive head and socket independently of each other. Typically, the hydraulic motor will rotate the drive head faster than the cylinder but at lower torques. Thus, the hydraulic motor will spin the threaded member down until it is snug, and then the hydraulic cylinder will tighten the threaded member to the desired torque. Alternatively, the hydraulic cylinder may break the threaded member out when it is tight. The hydraulic motor will then spin the loosened threaded member out. Finally, the wrench assembly includes a hydraulic fluid distribution system, including one or more valves that regulate hydraulic fluid flow through the wrench assembly.
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