design truck jacks

[jaiojack]

Good morning
I would like to design for the university, a cart jack, flow 3 ton. I should buy the hydraulic part but I can't find catalogs with technical specifications of the components I need. pumps and pistons for this use are collected in one component. Can you help me?

 

[meccanicamg]

we are talking about this object:looking a bit on the web are manuals and explosions.
the main components are a hydraulic cylinder, a pump, frame and arm.the first step is to build a cinematic scheme. then calculate the forces. then you can go see how to create the manual pump.
these details are also found on youtube....just search.

 

[meccanicamg]

if we have to buy spare parts there is the site qui where they sell single components...so we can buy the piston with pump:It is also true, that if it is a university project, you can also push in the design of the cylinder and pump and make it realize specially.
This video shows the single effect pump with unidirectional valves....

 

[meccanicamg]

here is a section of the mechanism:

Simply combine the pump system with the hinged piston between the frame and the lift arm.

for the return to the bottom, two pull springs are used and a screw that acts on the unidirectional valve and therefore loses the seal of the chamber, dumping oil in the tank.