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The PTU is used when, for example, there is right hydraulic system pressure but no left hydraulic system pressure. In this example, the PTU transfers hydraulic power from the right hydraulic system to the left hydraulic system. A PTU consists of a hydraulic motor paired with a hydraulic pump via a shaft. [1]
However, many hydraulic pumps cannot be used as hydraulic motors because they cannot be backdriven. Also, a hydraulic motor is usually designed for working pressure at both sides of the motor, whereas most hydraulic pumps rely on low pressure provided from the reservoir at the input side and would leak fluid when abused as a motor. [1]
On aircraft 25-061 through 25-180 the engine driven hydraulic pumps supply fluid under pressure of 1500 psi to the system pressure is maintained at 1250 to 1500 psi by a pressure regulator. On aircraft 25-181 and subsequent the variable volume engine driven pump delivers fluid under a pressure of 1450 psi to the system and static pressure is ...
A hydraulic pump is a mechanical source of power that converts mechanical power into hydraulic energy (hydrostatic energy i.e. flow, pressure). Hydraulic pumps are used in hydraulic drive systems and can be hydrostatic or hydrodynamic.
A C6-3 motor would have between 5.01 and 10 N·s of impulse, produce 6 N average thrust, and fire an ejection charge 3 seconds after burnout. An attempt was made by motor manufacturers in 1982 to further clarify the motor code by writing the total impulse in newton-seconds before the code.
SAI GM3 radial piston hydraulic motor [49] 15 kg 33 lb 15 kW 20 hp 1 kW/kg 0.61 hp/lb Denison GOLD CUP P14 axial piston hydraulic motor [50] 110 kg 250 lb 384 kW 509 hp 3.5 kW/kg 2.0 hp/lb Denison TB vane pump [51] 7 kg 15 lb 40.2 kW 53.9 hp 5.7 kW/kg 3.6 hp/lb Rexroth A2FM 16cc/rev, bent axis hydraulic motor (continuous output) 5.4 kg
If a hydraulic rotary pump with the displacement 10 cc/rev is connected to a hydraulic rotary motor with 100 cc/rev, the shaft torque required to drive the pump is one-tenth of the torque then available at the motor shaft, but the shaft speed (rev/min) for the motor is also only one-tenth of the pump shaft speed.
The main problem was that they were big, heavy, and only single-cylinder. For example, a typical 50 hp engine weighed 3 tons. After World War I, Mr. Cook wanted to retire. Bill Denison took over just as the engine market was dying. He continued to operate under the original Cook Motor Co. name. In 1925, Mr. Denison invented a hydraulic car pusher.
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