Monthly Archives for May 2010

Double Flapper Nozzle Shifting Servo Valve Spool

A diagram of the double flapper nozzle is shown in Fig. 11.10. Supply pressure (the setting of the relief valve or the setting of a pressure compensated pump) is supplied to the points identified with Ps (Fig. 11.10). Fluid flows … Continue reading

14. May 2010 by JackSparow
Categories: Servo Valves | Tags: , | Leave a comment

Torque Motor

As shown in Fig. 11.8, a torque motor consists of an armature, two coils, and two pole pieces. The coils are wrapped on the armature, and the armature is mounted such that the ends are positioned in the center of … Continue reading

14. May 2010 by JackSparow
Categories: Hydraulic Motor | Tags: | Leave a comment

Pneumatic Cylinder with Mounted Air Control Block

This unit has a cylinder and DCV combined in the same assembly (Fig. 10.14). The cylinder cycles back and forth until the air supply is turned off. Stroke length is infinitely variable by adjusting the stops on the slide attached … Continue reading

08. May 2010 by JackSparow
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Hydraulic Oscillating Actuator

There are some applications in which continuous rotation is not needed. Two examples are industrial mechanisms performing pick-and-place operations and heavy-duty, large-payload robots. Vane motors with one or two vanes are used for limited-rotation applications. The single-vane unit can rotate … Continue reading

07. May 2010 by JackSparow
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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 … Continue reading

07. May 2010 by JackSparow
Categories: Hydraulic Pumps | Tags: | Leave a comment

Design Considerations for Bent Axis Motors

The piston shaft (tapered section shown in Fig. 5.15) does not provide the linkage that ensures that the cylinder block rotates with the output shaft. This linkage is provided with another mechanism. Different manufacturers use various mechanisms to develop this … Continue reading

07. May 2010 by JackSparow
Categories: Hydraulic Motor | Tags: , | Leave a comment

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 … Continue reading

07. May 2010 by JackSparow
Categories: Hydraulic Pumps | Tags: | Leave a comment

Vane Motor (Low-Speed, High-Torque) Performance Characteristics

The Vickers Model MHT50 vane motor with 38 in3/rev maximum displacement was chosen for an example. This motor is rated for a maximum pressure of 4000 psi. Maximum continuous speed at 3000 psi is 200 rpm and maximum speed at … Continue reading

07. May 2010 by JackSparow
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Geroler Motor (Disc Valve) Performance Characteristics

The Char-Lynn 10,000 series motor with 40.6 in3/rev displacement was chosen for an example. (Notice that this displacement is approximately 10 times the displacement of the high-speed motors previously studied.) This motor has a maximum speed of 254 rpm for … Continue reading

07. May 2010 by JackSparow
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Hydraulic Piston Motor Efficiency

The fixed displacement axial piston motor (Sauer-Danfoss Model 90-075 MF), comparable to the variable displacement axial piston pump (Sauer-Danfoss Model 90-075 PV), was chosen. This motor has a maximum speed of 3950 rpm and a rated pressure of 6000 psi. … Continue reading

07. May 2010 by JackSparow
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