Hydraulic Actuator Fundamentals 190301d

Question 1

Double-acting cylinders are often called differential because:

Answer 1

There is a difference in the speed and forces generated by extension versus retraction.

2:1

Question 2

Variable displacement motors do not reach a zero displacement position because:

Answer 2

The motor will hydrostatically lock and stall ( free wheel) in the zero position.

Question 3

The difference between a differential and non-differential cylinder(s) is ?

Answer 3

Non-differential cylinders have equal piston area and equal volume on both sides of the cylinder.

Question 4

Leaking piston seals in a differential cylinder result in:

Answer 4

• increased cylinder cycle times
• cylinder drifting in the extension direction
• pressure intensification when in the hold position

Question 5

Pressurized oil is allowed to flow past the piston to the rod side of a ram type cylinder

True or False

Answer 5

True

Question 6

What does a cylinder rod wiper do ?

Answer 6

Prevent contamination from entering the cylinder.

Question 7

The quick drop valve provides regeneration when ?

Answer 7

The full lower position is used.

Question 8

One factor that does not influence motor torque generation is ?

Answer 8

Inlet flow rate.

Question 9

Most motors have a drain line that carries what to what ?

Answer 9

Motor leakage oil to the reservoir.

Question 10

Gerotor motors are what Soren and what torque ?

Answer 10

Low speed height torque.

Question 11

What does the spool valve do on gerotor motors ?

Answer 11

Direct the flow of oil to and from the valleys in the gerotor element.