This reduction would only be momentary because as soon as pressure requirements go below the 1000psi unloader setting the pump would revert back to low pressure high flow. Of course that 28gpm high flow is still split to 14gpm per cyl so you will see a real reduction in cyl speed as soon as the pump does kick down to high pressure low flow.
WHATSIZE HYDRAULIC PUMP FOR 18HP GAS ENGINE FULL
If using a 2 stage pump, biggest I have found has been a 28gpm, you can set the unloader on the pump up to 1000psi so that you have the full 28gpm flow at 1000psi and at that point the unloader inside the pump will switch to low flow high pressure and allow you to build what ever pressure is needed to make the split. I feel that letting the engine bog, and maybe stall, to reduce flow is going to be pretty hard on the engine. The engine will start bogging and slowing down and eventually stall, maybe before the split is made. While a single stage gear pump will give you the flow and pressure rates you are looking for, the minute the pressure reaches above your 1000psi you think you will need, its going to stall the engine. 35gpm of oil sounds like a lot of flow, but if you split it between two cyl, you end up with about 17.5gpm per cyl. While using two cyl will give you more tonnage at a given pressure than a single similar cyl will, it will also cut the speed in half. What kind of force (tons)do you think you will need that you think you can get away with just 1000psi. What size cyl's and rod size and what lenght stroke.
Is that right, can these small diesel engines tolerate those kinds of fluctuations in rpm, or am I setting myself up to destroy this engine? So with a single stage gear pump I could be good for running 2000psi? If I bog the engine down to 2000rpm on something really tough, that will lower the flow to (2000/3600) X 35gpm=19.5gpm But the peak torque for the engine is at 2000 rpm. The engine is rated for 3600rpm, so that's how I'll size the pump to get 35 gpm. So with a 26hp engine I should be good for most stuff. This is the second prototype, I'm estimating that the splitter should be peaking at about 1000psi for most splitting applications and I'd like to be running 35gpm. I am considering a 26hp kubota 3 cylinder diesel to power it, but I'm unclear if I can set the engine to turn at it's rated 3600rpm for the small stuff and let it bog to 2000rpm on the tough wood. I'm in the last stages of building my monster splitter.
0 kommentar(er)
