variable displacement piston pump 

Thank you for your comment. What you described is a rotating swash plate type of pump. This is a HYDRAULIC PUMP OR MOTORS OF THE ROTATING BARREL-TYPE. Pistons pushed against swash plate by internal springs and they DO rotate.

It is drainage. Oil leaking from pistons send to the reservoir from that port. Thanks for asking. I will put an annotation for it.

It doesn't have to. Since there is no pumping action, there will be no overload on the electric motor. If this unit is used in hydraulic transmission circuit, you may be changing rotation direction of the motion very often and in this case rotation should not stop.

Finally I understand how the ports work. Thanks!

The operator changes the angle of the swash plate to control the volume (and direction) of the liquid being pumped without changing pump shaft speed or direction.

If you just want to control the amount of flow going to a hydraulic motor by using variable displacement piston pump than there is no need for the reversing of the swash plate. In this case you just control the speed of the hydraulic motor in one direction. However if you want to control the speed of a hydraulic motor in both direction then swash plate should be reversed so that flow goes in both direction. I hope someone more experienced in this subject might clarify my comment further.

Thank you for visiting my channel. I do not know any web site that explains this pump. I did a Google search and I end up getting a lot of company web site for this hydraulic pumps without any explanation.

Thanks for the video. it cleared my understanding for its application in controlling a hydraulic motor.

In rotating machines the torque and angular velocity are not independent. The product of torque times angular velocity is equal to the HP. For the hydraulic motor the relationship is given with the formula HP = T × n / 63025. As you can see, if rpm goes up, torque goes down or vice versa.

@gizmoguyar Thank you.

@2sydd Thank You.

Why doesn't the rotation stop when the swash plate becomes vertical?

Lots of thanks...I was pretty complicated by trying to figure it out the way of working on drawings..

Because we want to control rpm or torque of the motor.

Vickers, Eaton, Rexroth, Parker, Sauer Danfoss, Ingersoll Rand.

I was taking a part in developing this kind of motor in 1997 year in Russia.

The pressure varried for what? TVC or torque variable control? I think all pump are positive displacement

Thanks man, i just wanted to ask you if all variable displacement pumps have reversible swash plate like in your animation ?? because in the manuals it is not clear if the swash plate reverses.

Thank you.

What is the threaded-looking, yellow thing at the bottom of the unit?

Excellent, as always.

nice try but the pistons on the swash plate doesnt have a rotary motion ,they move up and down on the plate. And the swash plate plate has too components .one that rotates and one fixed ,the pistons or plungers are mounted on the fixed part.

urgent, need explanation. It seems to me that changing swash plate angle adjusts torque transmitted, how is speed changed? correct my understanding.

Thank you for the video, very explanatory

in my comp, wen we open the pump, we could see the piston markings on the retainer plate / squash plate, why is it happening? can you tell me?

how swash plate angle change takes place during pump running

Wow I completely understand now. thank you.

Without seeing whole system it is hard to say? I am sure someone more experienced in this pump can answer this question.

why does the swash plate's angle change?

which companies supply this kind of pumps ?

Please watch my video titled "Hydrostatic Transmission" and see how motor rotation and speed is controlled by changing swash plate angle

Thanks for the good video!

I am sorry Nguyen. I am not selling any product. So I can't do that.

can anyone link me to a video, that explains a pressure compensated pump, im battling to understand it. thanx

i do the repairing of the proportional valves servo pumps piston pumps like ASE, ASR VSO , Series and do the repairing of the injection moulding machine we old one to new one retro fitting also we do

can give me a website that explain all the operation of this pump

I was planning to do pressure compensated pump animation. Your comment helped me to finish it. I just uploaded a video. Please check it out and let me know what you think.

awesome video!

có ai biết vẽ sơ đồ cơ cấu của bơm này k ạ f₫giúp em với ạ

I LOVE YOU BUDDY

Uhmm? For you guys this is not a strong video.

@coffebreak2 Thank you.