A hydraulic driving apparatus that drives a plurality of driving subjects and regenerates energy thereof. This hydraulic driving apparatus includes: a first pump motor; a second pump motor that is switchable between a state of moving a first driving subject by hydraulic oil discharged from the first pump motor and a state of being operated as a pump by means of energy of the first driving subject; a first pump motor line that couples the first and second pump motors with each other; a first accumulator connected to the first pump motor line; a regeneration subject hydraulic actuator that moves a second driving subject; a second accumulator that receives hydraulic oil from the regeneration subject hydraulic actuator; a second pump motor line that couples the second accumulator with the first pump motor; and a pressure release changeover valve that opens/closes the second pump motor line.

A hydraulic driving apparatus that drives a plurality of driving subjects and regenerates energy thereof. This hydraulic driving apparatus includes: a first pump motor; a second pump motor that is switchable between a state of moving a first driving subject by hydraulic oil discharged from the first pump motor and a state of being operated as a pump by means of energy of the first driving subject; a first pump motor line that couples the first and second pump motors with each other; a first accumulator connected to the first pump motor line; a regeneration subject hydraulic actuator that moves a second driving subject; a second accumulator that receives hydraulic oil from the regeneration subject hydraulic actuator; a second pump motor line that couples the second accumulator with the first pump motor; and a pressure release changeover valve that opens/closes the second pump motor line.

A crane calculates the resonance frequency of the fluctuation of a suspended load determined from the hanging length of a main wire rope or a sub wire rope, generates a control signal for actuators, in accordance with the operation of a turning operation tool, a hoisting operation tool and the like, and generates a filtering control signal for the actuators in which a frequency component in any frequency range has been attenuated from the control signal at any ratio in reference to the resonance frequency. When the actuators are controlled by the operation of the respective operation tool and when the actuators are controlled regardless of the operation of the respective operation tool, the frequency range to be attenuated and the attenuation ratio are switched to different settings.

The present disclosure relates to a hydraulic system including a variable displacement hydraulic motor for lifting and lowering a load. The hydraulic motor has a high operating speed and a low operating speed. The system also includes an actuator for controlling whether the hydraulic motor is operating at the high or low speed, and a pressure sensor for sensing when a system pressure corresponding to the hydraulic motor exceeds a threshold pressure value. The system further includes a speed control system that controls the actuator such that the hydraulic motor is prevented from operating at the first operating speed when the system pressure exceeds the threshold pressure value.

The present disclosure relates to a hydraulic system including a variable displacement hydraulic motor for lifting and lowering a load. The hydraulic motor has a high operating speed and a low operating speed. The system also includes an actuator for controlling whether the hydraulic motor is operating at the high or low speed, and a pressure sensor for sensing when a system pressure corresponding to the hydraulic motor exceeds a threshold pressure value. The system further includes a speed control system that controls the actuator such that the hydraulic motor is prevented from operating at the first operating speed when the system pressure exceeds the threshold pressure value.

A track-type machine is disclosed. The track-type machine may comprise an electric drive powertrain including an internal combustion engine, a winch assembly having a drum rotatably supporting a cable so that the cable is reeled in or reeled out at a winch line speed when the drum is rotating, and an implement controller configured to activate the winch assembly for reeling in and reeling out the cable. The track-type machine may further comprise a hydraulic circuit driven by the internal combustion engine and configured to actuate a rotation of the drum when the winch assembly is activated by the implement controller. In addition, the track-type machine may further comprise a control system configured to increase an engine speed of the internal combustion engine when the winch assembly is activated by the implement controller.

We generally describe a winch (100) comprising: a plurality of ropes (130, 140) coupleable to a first load (200) or to different respective second loads (200, 210); a support frame (110); and a first roller (150) moveably coupled to the support frame (110), wherein a first rope (150) of the plurality of ropes (130, 140) is moveable over the first roller (150); wherein a movement of the first roller (150) is configured to shorten and/or lengthen a usable length of the first rope (140) of the plurality of ropes (130, 140), and wherein the shortening and/or lengthening of the usable length of the first rope (140) is configured to raise and/or lower the first load (200) or one of the second loads (200, 210) to which the first roller (150) is coupleable via the first rope (140).

A winch boom system and method includes a frame, a shaft supported by the frame, and a winch drum attached to the shaft such that rotation of the shaft about a shaft axis rotates the winch drum. A boom is pivotably coupled to the frame, the boom defining a cavity in which the winch drum is positioned. A winch rope is wound about the winch drum, passing through the cavity of the boom, and extending from the boom at a point distal from the winch drum.

A control device of a hydraulic winch includes an engine, a hydraulic pump, a hydraulic motor driving a winch drum, a winch manipulating member, an engine control unit controlling a rotation speed of the engine, a winch load detector detecting a load applied to the winch drum, and a motor capacity control unit controlling a motor capacity of the hydraulic motor so as to decrease a motor capacity of the hydraulic motor in a fuel-saving operation mode to a motor capacity which is smaller than a motor capacity of the hydraulic motor in a normal operation mode. The engine control unit sets an upper limit value of the rotation speed of the engine in the fuel-saving operation mode to a value which is lower than a maximum rotation speed of the engine in the normal operation mode and corresponds to the load detected by the winch load detector.

A control device of a hydraulic winch includes an engine, a hydraulic pump, a hydraulic motor driving a winch drum, a winch manipulating member, an engine control unit controlling a rotation speed of the engine, a winch load detector detecting a load applied to the winch drum, and a motor capacity control unit controlling a motor capacity of the hydraulic motor so as to decrease a motor capacity of the hydraulic motor in a fuel-saving operation mode to a motor capacity which is smaller than a motor capacity of the hydraulic motor in a normal operation mode. The engine control unit sets an upper limit value of the rotation speed of the engine in the fuel-saving operation mode to a value which is lower than a maximum rotation speed of the engine in the normal operation mode and corresponds to the load detected by the winch load detector.