Module 9 Flashcards
a motor that converts the movement and pressure of hydraulic fluid into the energy of a rotating shaft
Hydraulic motor
a motor that has a mechanical seal between the inlet and outlet ports
Positive-displacement motor
the range of operating pressures from the minimum needed to turn a hydraulic motor to the maximum the motor can withstand without suffering damage.
Pressure range
the twisting effect that causes a piece of equipment to rotate
Torque
All hydraulic motors have _____ displacement.
Positive
The shaft speed of a fixed, positive-displacement motor can be changed by varying the _____ of the hydraulic fluid.
Flow rate
The pressure range for most hydraulic motors varies from _____ to _____ psi.
100; 5000
Name the three kinds of motor torque.
Starting torque
Running torque
Stalling torque
When selecting a replacement motor for a system, always make sure it is compatible with the system’s _____.
Fluid
The service life of a hydraulic motor is measured in _____.
Hours
A hydraulic motor functions by changing the volume of its ____.
Fluid chamber
As fluid under pressure moves through the motor, its moving energy is transferred to the _____ of the motor.
Revolving shaft
Rotation in an internal gear motor is caused by fluid pressure acting on the _____.
Gear teeth
Gear motors may be supplied with _____ plates to help maintain the pressure and reduce internal leaks.
End or Wear
A vane motor made with two motor chambers is called a(n) _____ motor.
Balanced
A vane motor with a movable cam ring has a _____ displacement.
Variable
Variable-displacement vane motors have higher internal _____ than fixed-displacement motors.
Slippage
The reciprocating motion of an axial-piston motor is converted to rotary motion by the _____.
Cam Plate
For axial-piston motors, displacement is adjusted by changing the angle of the _____.
Swash Plate
Rotary actuators move in an arc that is less than a full _____.
Revolution
The speed of a hydraulic motor is determined by the fluid’s
Flow rate
All hydraulic motors are _____ motors.
Positive-displacement
The maximum fluid pressure that a motor can withstand is defined by
Its pressure range.
The force exerted by a hydraulic motor while operating normally is called
Running torque
When a new hydraulic motor is installed in an existing system, its compatibility must be checked against all of the following except the
a. effect the fluid has on the seals
b. fluid’s resistance to foaming
c. fluid’s viscosity index
d. piping material
d. Piping material
The service life of a hydraulic motor is given in
Hours of operation
The pressure of the hydraulic fluid entering an internal gear motor acts on the
Gear teeth
Gear motors are frequently equipped with wear plates to prevent
Internal leakage.
Which of the following characteristics applies to variable-displacement hydraulic motors?
a. balanced design
b. compact size
c. economical operation
d. high slippage rates
d. High slippage rates.
How far can vane-type rotary actuators rotate?
Just under one revolution.
