Category: Hydraulic Pump

Variable Displacement Pump Flow and Pressure Characteristics

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Variable Displacement Pump Flow and Pressure Characteristics

Generally, the flow and pressure characteristics of variable-displacement pumps are given as constants assuming linear characteristics. As stated before, for high-pressure operation with low-viscosity fluids, the pump characteristics may become more nonlinear. In this case, the nonlinearities should be considered in the system servo analysis work. Complete pump characteristics of flow and pressure can also …

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Variable Displacement Pump Leakage Characteristics

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If the pump is driven at constant speed, the flow from the pump is directly proportional to the pump stroke. The output pressure or discharge pressure from the pump is determined by the load or the restriction to the pump discharge flow. As the pressure is increased, the discharge flow will decrease because of leakage …

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VARIABLE-DISPLACEMENT PUMPS

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VARIABLE-DISPLACEMENT PUMPS

In servo control systems, the variable-displacement or servo pump performs the same basic function as the control valve. However, the servo pump generates the controlled fluid power as demanded in response to an input control signal. In most applications, the pump is driven at nearly constant speed by an electric motor or some other mechanical …

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Gearboxes Hydraulic Pump Mounts

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Gearboxes Hydraulic Pump Mounts

Hydraulic pump mounts are gearboxes that are designed to drive the pumps. These gearboxes have one input and provide connections for mounting one to four pumps on the output side. Mounts can be equipped with clutches and available for different gear ratios. When a diesel engine is used as the prime mover, the engine must …

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Multiple Hydraulic Pump Circuits

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Multiple Hydraulic Pump Circuits

The multiple hydraulic pump types install two or more pumps in the same housing and use a single shaft to drive. Each pump has its own outlet although in some application one inlet is provided. The pump shown in figure above drives the fluid to a hydraulic motor and cylinder actuator. When the electric solenoid …

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Hydraulic Vane Pump Volumetric Efficiency

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Hydraulic Vane Pump Volumetric Efficiency

Vickers Pump Model 25V-T is a hydraulic vane pump which has a 4.81 in3/rev displacement with max speed 1800 rpm and max pressure 2500 psi. The vane pump volumetric efficiency at 1200 rpm decreases from 97.3% at 500 psi to 84% at 2500 psi. While the hydraulic gerotor pump volumetric efficiency decreased from 91.5 to …

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Hydraulic Variable Displacement Pump

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Hydraulic Variable Displacement Pump

An expensive hydraulic variable displacement pump offers many options for hydraulic circuit design. The pump displacement can be changed using a servo valve to manipulate the actuator speed movement. The open loop hydraulic design as shown in figure above can be re-design in to a closed loop system by adding sensor on the gearbox output …

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Hydraulic Radial Piston Motors

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Hydraulic Radial Piston Motors

Radial piston motors produce very high torque at low speed. They are used as wheel motors for large equipment. Pistons operate in radial bores in a stationary cylinder block. The surrounding housing rotates (Fig. 5.18). The rotating housing has two identical cam rings. The pistons each have two cam rollers. An extending piston forces the …

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Hydraulic Bent Axis Motors

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Hydraulic Bent Axis Motors

Bent axis motors were developed to improve the operating and stall torque efficiencies of high-speed motors. The design (Fig. 5.15) operates in a manner similar to that of the axial piston design. A series of cylinders are mounted around the center line of the bent axis. The pistons in these cylinders have a spherical end …

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