Module 8 Flashcards
a device that converts the pressure and movement of hydraulic fluid into straight-line mechanical force and motion
Cylinder
a cylinder that can exert hydraulic force in either direction
Double-acting cylinder
a cylinder that can exert hydraulic force in one direction only
Single-acting cylinder
a cylinder having from two to six sleeves that slide or nest together
Telescoping cylinder
a cylinder with two independent pistons that con move together or individually
Two-piston cylinder
The actuating device used to convert fluid pressure into straight-line mechanical force is the hydraulic _____.
Cylinder
A doubled-acting cylinder can exert force in _____ direction(s).
Two
A cylinder that can exert force in one direction only is called a(n) _____ cylinder.
Single-acting
A pull-type cylinder works on the _____ stroke.
In or Retracting
The rod diameter of a ram cylinder is almost equal to the _____ diameter.
Piston
Must the two pistons in a two-piston cylinder move in unison?
No
A positional cylinder has how many extended rods?
One
Should the piston rods of jig or fixture cylinders be allowed to rotate?
No
The two methods of mounting cylinders in position are the _____ and _____ mounting techniques.
Fixed; Pivoted
What type of fixed cylinder mounting produces off-center loading in the supporting structure?
Noncenterline
When cylinders are mounted on machine tools, they must be _____ properly.
Aligned
Trunnion-mounted or clevis-mounted cylinders are classed as being _____ cylinder mountings.
Pivoted
List four things you must know in order to select the proper cylinder for an existing system.
System pressure
Flow capacity
Pump capacity
Hydraulic line size
You can calculate the amount of force a cylinder exerts by multiplying _____ times _____.
Piston area; Fluid pressure
When calculating the force required to move a load, starting friction and the _____ factor must be taken into account.
Acceleration
Hydraulic or mechanical shock is prevented in a cylinder by using a(n) _____ device.
Cushioning
Hydraulic cylinders convert fluid force into
straight-line motion
In a double-acting cylinder, the thrust is
greater when the piston forces the piston rod out of the cylinder.
A double-end rod cylinder has a piston surface area that is
equal on both sides.
Which of the following is true of a ram cylinder?
a. It can exert force in either direction
b. It is a double-acting cylinder
c. It usually does not require piston seals
d. Its rod diameter is larger than the piston diameter
It usually does not require piston seals
The pistons of a two-piston cylinder always move
independently
The end caps or heads of most industrial hydraulic cylinders are held in place by
tie rods
Cylinders that move heavy thrust loads are usually furnished with
square flanges
To select the proper hydraulic cylinder for use in an existing system, you must know all of the following except
a. flow capacity
b. piston speed
c. pump capacity
d. system pressure
Piston speed
To determine the total cylinder force, you must multiply the load times the acceleration factor and add the
Frictional resistance
What is the purpose of the cushioning device used with a hydraulic cylinder?
Prevent mechanical shock
