What is the speed of expansion and contraction of a hollow piston rod? Should it be lubricated?

There are many questions about piston rods, including these two that are for:

Question 1: What is the maximum speed at which the piston rod of a hydraulic cylinder can be extended and retracted?

Question 2: Do the piston rods of cylinders and cylinders need to be refuelled regularly?

Since the above questions raised, then the next step is to specifically address these two issues, is a clear understanding, so as to better understand the product.

Question 1: hydraulic cylinder piston rod expansion and contraction of the maximum speed can be achieved?

Hydraulic cylinder piston rod expansion and contraction speed, which is mainly related to the amount of oil, generally the more oil into the volume, the faster its speed. Therefore, its maximum speed can not be estimated and given, should be combined with the actual situation. However, it should be noted that in the limit position of the piston rod movement, you can take some cushioning measures to avoid collision and other problems.

Question 2: Do the piston rods of cylinders and pneumatic cylinders need to be refuelled regularly?

For the oil cylinder is not necessary, for the cylinder can be slightly added.