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Hydrostatic Transmissions
Published in John S. Cundiff, Michael F. Kocher, Fluid Power Circuits and Controls, 2019
John S. Cundiff, Michael F. Kocher
There is a tendency to think of the impeller as a hydraulic pump and the turbine as a hydraulic motor. In truth, the function of the impeller is to pump (impart momentum to) a fluid, and the function of the turbine is to convert fluid energy back into mechanical energy. Our discussion of pumps is as devices that generate a high pressure (P) and low (relatively low) flow rate (Q). The torque converter is a low P, high Q device. Remember that power is a product of P and Q. Both devices can transmit the same power; one does it with a high P and low Q and the other with a low P and high Q.
Ocean Wave Energy Harvesting
Published in Alireza Khaligh, Omer C. Onar, Energy Harvesting, 2017
The Salter Cam WEC generates electric power through the harmonic motion of the free part of the device around the fixed inner cylinder. The outer part rises and falls with respect to the motion caused by the ocean waves. This motion pumps a hydraulic fluid that drives a hydraulic motor. This motor is coupled to the shaft of an electric generator that generates electricity. The block diagram explaining the operation principle of the Salter Cam is shown in Figure 4.12. The Salter Cam is extremely efficient in energy production and its applications have gained a lot of interest recently.
Accessories
Published in Tony Giampaolo, Gas Turbine Handbook: Principles and Practice, 2020
Indirect-drive pump systems rely on a hydraulic pump or an electrical generator mounted on the accessory gearbox. The hydraulic pump (or electrical generator) provides the motive force to drive the lube oil pump through a separately mounted hydraulic motor (or electric motor). This configuration allows either pump to be the primary unit. Through judicious control techniques, the secondary pump can replace the primary pump, in the event of its failure, without disrupting the operation of the gas turbine. The redundant lube oil pump can then be serviced with the gas turbine in operation.
Study on the Friction Performance of Textured Surface on Water Hydraulic Motor Piston Pair
Published in Tribology Transactions, 2022
Zhiqiang Wang, Jinbo Xiang, Qi Fu, Robert J. K. Wood, Shuncai Wang
The structure of the water hydraulic motor is shown in Fig. 1a. When the water hydraulic motor works, it injects high-pressure and low-pressure liquid into the piston cavities of the rotor body through the port plate. Under the action of water pressure, the ball on the piston pair is close to the inner surface of the stator. As shown in Fig. 1b, the torque that drives the hydraulic motor to rotate is produced by the tangential component force of the reaction force (N) on the inner surface of the stator to the rolling ball, which will finally form the torque and speed up the output shaft. The commonly used material of the rotor body is 316L stainless steel, and the pistons are usually made of carbon fiber–reinforced polyether ether ketone (CFRPEEK). CFRPEEK is a composite material consisting of PEEK (matrix material) and short carbon fibers (reinforcement). Because of its good mechanical properties, especially its excellent tribological properties in seawater corrosive environment (18, 19), it is widely used in the manufacture of water hydraulic actuators and even medical implants (20). The material properties of the piston pair are provided in Table 1.