Spring-Loaded Accumulator

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Pneumatic Accumulators

Construction Mechanic Basic Volume 2

Tubing, Piping, and Hose

SPRING-LOADED ACCUMULATORS.- The spring-loaded accumulator (fig. 3-34) is very similar to the weight-loaded accumulator except that springs do the loading. In operation, pressure oil loads the piston by compressing the spring. When pressure drops, the spring forces oil into the system.

Figure 3-34.- Spring-loaded accumulator.

Motors
A hydraulic motor is a device that converts fluid power energy to rotary motion and force. The function of a motor is opposite that of a pump. However, the design and operation of motors are very similar to pumps.

Motors have many uses in fluid power systems. In hydraulic power drives, pumps and motors are combined with suitable lines and valves to form hydraulic transmissions.

Fluid motors may either be fixed-or variable-displacement. Fixed-displacement motors provide constant torque and variable speed. Controlling the amount of input flow varies the speed. Variable-displacement motors are constructed so that the working relationship of the internal parts can be varied to change displacement. The majority of the motors used in fluid power systems are the fixed-displacement type.

Fluid motors are usually classified according to the type of internal element that is directly actuated by the flow. The most common element are the gear (fig. 3-7), the vane (fig. 3-12), and the piston (fig. 3-15).