Module 9 Flashcards
a motor that converts pressure energy directly into mechanical energy
Pneumatic motor
a motor with a mechanical seal somewhere between the inlet and outlet ports
Positive-displacement motor
a rating of a pneumatic motor’s ability to withstand air pressure without damage or internal leakage
Pressure rating
the rotational force exerted on an object
Torque
the turning force the motor exerts from a dead stop
Starting torque
the turning force exerted when the motor is running, and which changes with any change in air pressure
Running torque
the force necessary to stop the motor once it is running
Stalling torque
A pneumatic motor converts kinetic energy and potential energy of compressed air into rotary _____.
Mechanical Energy
Pneumatic motors are classified both by their driving elements and by their principles of _____.
Operation
Unlike turbines or energy convertors, all pneumatic motors have _____ displacement.
Positive
Name the three kinds of motor torque.
Starting Torque
Running Torque
Stalling Torque
The horsepower output of an air motor is the product of the motor’s torque and _____.
Shaft Speed
When selecting a pneumatic motor, always check the maximum air _____ required to drive it.
Consumption
Compared with hydraulic motors, pneumatic motors are more easily _____.
Controlled
Name the three types of pneumatic motor construction.
Vane
Radial-Piston
Axial-Piston
The reciprocating motion of the axial-piston motor is converted to rotary motion by the _____.
Wobble Plate
When a radial-piston motor is running, the entering compressed air is first directed to a _____ valve.
Rotating
Pneumatic rotary actuators usually travel less than one _____.
Revolution
Reciprocating rotary motion is delivered by a piston-type rotary actuator by means of a(n) _____ gear set.
Rack-and-Pinion
To control the amount of torque delivered to the tool, a pneumatic impact wrench usually has an adjustable _____ in its drive train.
Clutch
Chipping hammers are usually powered by a reciprocating _____.
Piston
A hydraulic system can be pressurized by a pneumatic system through the use of an air _____.
Booster
In an air booster, hydraulic fluid occupies the _____-diameter chamber.
Small
What type of energy is available from a pneumatic motor?
Mechanical kinetic energy
Which of the following is most important to consider when selecting a pneumatic motor?
a. Air consumption
b. Lubrication requirements
c. Mounting features
d. Output shaft size
a. Air consumption
Pneumatic motors are classified according to their _____.
Driving elements and principle of operation
The main advantage pneumatic motors have over hydraulic motors is that pneumatic motors _____.
Are more portable.
All pneumatic motors are constructed with a mechanical seal and operate on the principle of _____.
Positive displacement.
Which of the following is not a type of positive displacement motor?
a. Axial-piston
b. Radial-piston
c. Rotary-actuator
d. Vane
Rotary-actuator.
Which of the following relationships is most likely to be found in a pneumatic motor?
a. Running torque = 75% of stalling torque
b. Running torque = 75% of starting torque
c. Starting torque = 75% of running torque
d. Starting torque = 75% of stalling torque
d. Starting torque = 75% of stalling torque
The direction of rotation in a pneumatic motor is reversed by means of ______.
Reversing the airflow.
The horsepower output of a pneumatic motor is calculated on the basis of the motor’s _____.
Torque and speed.
Vane motors are found mostly in _____.
Power drills and wrenches.
