pump question ....

[cosworth34677]

is there a way to only use one pinion gear to make a pump? instead of the two i see? or do you need the two gears? im just throwing around ideas?

[pugs]

Need 2 to create a pressure zone. A one rotating piece pump would be like a vane pump that has vanes that float in and out to seal and make the pressure zone.

Can also look at gerotar style pumps, like the oil pump in alot of engines. It uses a central gear and a ring gear with the centers of rotation slightly offset.

Edit: Above is for positive displacement style pumps. You can also have non- positive displacement pumps such as a centrifugal but they generally loose alot of pump efficiency as soon as you try to create any kind of pressure i.e. the pump slips.

[cosworth34677]

Need 2 to create a pressure zone. A one rotating piece pump would be like a vane pump that has vanes that float in and out to seal and make the pressure zone.

Can also look at gerotar style pumps, like the oil pump in alot of engines. It uses a central gear and a ring gear with the centers of rotation slightly offset.

Edit: Above is for positive displacement style pumps. You can also have non- positive displacement pumps such as a centrifugal but they generally loose alot of pump efficiency as soon as you try to create any kind of pressure i.e. the pump slips.


so a centripical stype pump is not that good for our stuff?

[pugs]

Centrifugal style pumps are good for moving fluid from one point to another, positive displacement pumps are good for creating pressure and transferring energy.

[cosworth34677]

ahhh cool . im trying to make use of 4 actuators i got. i have my dump bed set up of a 1-1 setup but there is no power. i was thinking of taking the bigger one to push the smaller one but i don't think that will give me anymore power

[ihbuilder]

now your talkin piston pump , much like a master cylinder in a hydraulic brake system . It will work well but, you must get all the air out of the system . you got a pic of what your doing ? could just be your lacking in mechanical advantage .

[cosworth34677]

here the setup as of now. the black ram pushes the gold one. the black one is alot bigger the the other
http://i78.photobucket.com/albums/j86/cosworth34677/20130211_211241_zps4a767322.jpg

[pugs]

Should work, but the little one will have less force than the servo applies on the black one. But will travel farther. If they were same size than servo force would equal dump cyl force and travels would be same.

[grumpygrady]

smaller size should be pushing fluid to the larger one
the small surface moves x amount and when it gets to large size it has say 10 times the surface area so it moves 1/10 amount but is 10 times stronger
i will see i can find a formula

[grumpygrady]

http://hydraulicspneumatics.com/other-technologies/book-2-chapter-6-fluid-power-cylinders

http://www.freestudy.co.uk/fluid%20power/cylinders.pdf

http://www.toro.com/customercare/commercial/education/pdf/09169sl.pdf
this one has real nice pictures lol

the third system is showing what i was trying to say earlier lol