stratopower hydraulic pump

The pistons are arranged in parallel with each other in a circular array. The bottom of each piston terminates with a ball. The balls are gripped by sockets in a rotating "swash plate." This plate can be tilted at various angles; if perpendicular to the axis, no piston movement occurs. If tilted, the swash plate precesses (wobbles), driving the pistons back and forth. Thus this is a variable-displacement pump, which can maintain a steady pressure under wide range of flow, such as in a system with various loads running or not running, or running at varying speeds.

One manufacturer is Sperry-Vickers, and you might be able to find some Website pictures.

thank you - Steve

Good illustration.............however, the pump shown is not a variable delivery pump, it is a fixed delivery pump...........and I believe the user specifically requested a variable delivery pump.............the angle of the swash plate does not change.

This is a variable delivery pump

The swash plate angle can be altered to give variable flow.........from the position where the swash plate is now, the angle can be altered between its angle now and the vertical position. The closer the angle approaches the vertical, the flow rate reduces.........when the swash plate reaches the vertical position we have no flow (no piston movement).

In many pumps the swash plate can be moved to maximum angle, opposite to that shown. The inlet and outlet ports change to their opposites (the inlet port becomes the outlet port), thereby causing a reverse direction of flow of oil, with the pump running in the same direction.

The change in swash plate movement can be controlled by any number of means, e.g. mechanically, hydraulically, electronically....or combination of means.

.........and , or course the pump action is the same as shown by lynlynch.

You are correct. Now, hopefully, the student will grasp the concept firmly.

_{But, it's a shame your pump doesn't move.}

Now, Guest, let's here from you.

......but, I did say it woks the same as your very good animated illustration, irrespective of pumping rate.

^{Sorry my illustration didn't move.}

Sorry! I forgot

http://www.pumpschool.com/

Hi ferquiza,

Excellent pump primer. But, I see no reference to either a wobble plate or swash plate pump here. Did I miss it?

No, just somebodie gave this reference in some old thread and i saved it because is very nice to me so then i thought the poster could like it same than me being he is studing principles pumps wright now or i think so.-