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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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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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Hydraulic Vane Motor Efficiency

A Vickers Model 25M (65) vane motor was chosen for the comparison. This motor is rated for 3000 rpm at 2500 psi maximum pressure. It has a displacement of 4.19 in3/rev. Efficiencies were calculated for a 35 GPM input flow. … Continue reading

07. May 2010 by JackSparow
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Hydraulic Gear Motor Efficiency

The gear pump design can also be used as a motor. The Hydreco Model 1919 motor has a theoretical displacement of 4.53 in3/rev, a maximum pressure rating of 2500 psi, and 3000 rpm maximum speed rating. Efficiencies were calculated for … Continue reading

07. May 2010 by JackSparow
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Typical Performance Data for a Hydraulic Gear Motor

Manufacturer’s data for a gear motor are given in Fig. 5.2. These data serve as an example of typical data supplied by a manufacturer. The sloping horizontal curves are pressure drop (?P across motor), and the sloping vertical curves are … Continue reading

07. May 2010 by JackSparow
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Sources of Hydraulic Contamination

There are four sources of contamination in hydraulic fluid. 1. Built-in contamination. This is contaminate that was left in the system when it was assembled. It can range from a piece of teflon tape to a piece of welding slag. … Continue reading

06. May 2010 by JackSparow
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Hydraulic Contamination Control

There are three types of failure in a fluid power system. 1. Degradation. The performance of the component degrades over time as surfaces wear, clearances increase, and leakage increases. 2. Intermittent. Valves stick and then break loose such that operation … Continue reading

06. May 2010 by JackSparow
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