hydraulic cylinder
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Topic: hydraulic cylinder
Posted By: acd17toy
Subject: hydraulic cylinder
Date Posted: 02 Nov 2019 at 6:57pm
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Need to replace a bad hydraulic cylinder, will a bigger cylinder give more lifting power, without changing the pump pressure?
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Replies:
Posted By: Jim.ME
Date Posted: 02 Nov 2019 at 7:50pm
| Yes, same pressure applied to larger area (bigger diameter) will develop more force. |
Posted By: Coke-in-MN
Date Posted: 02 Nov 2019 at 11:28pm
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Yes lifting capacity will increase but speed will decrease in cycle time . Take your PSI and flow rate and multiply by sq in of the piston will give you a idea of what you gain or lose . Surplus Center might have what you need at the price you can afford for new cylinders . ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: KJCHRIS
Date Posted: 03 Nov 2019 at 12:08am
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As already said, lifting force will go up but the trade off is that speed of raising & lowering will slow down. ------------- AC 200, CAH, AC185D bareback, AC 180D bareback, D17 III, WF. D17 Blackbar grill, NF. D15 SFW. Case 1175 CAH, Bobcat 543B, |
Posted By: acd17toy
Date Posted: 03 Nov 2019 at 7:01pm
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Good deal as the present cylinder is faster than I like, so a bigger cylinder will slow things down.
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Posted By: Ted J
Date Posted: 04 Nov 2019 at 3:12pm
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NOW what are you foolin around with Jim? Something fun? ------------- "Allis-Express" 19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17 |
Posted By: jaybmiller
Date Posted: 04 Nov 2019 at 4:55pm
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hmm.. if there's lots of GPM, it'll raise as fast as the orginal ? ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: Tbone95
Date Posted: 05 Nov 2019 at 9:38am
Nope. For a constant flowrate, Velocity is proportional to the cross sectional area. It's called the continuity equation Q (cu ft/s) = V (ft/s) x A (sq. ft) Rearrange to suit, and use any units such as ft, inches, meters, doesn't matter as long as you use the same in all three terms.
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jaybmiller wrote:Posted By: jaybmiller
Date Posted: 05 Nov 2019 at 10:34am
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well that's a bummer... I found this... Cylinder Speed (ft/min) = 19.25 x flow rate (gpm) / area (in²) which says to me if you can increase flow rate(gpm), it'll go faster.. so bigger hoses would mean it'll go faster ? ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: Tbone95
Date Posted: 05 Nov 2019 at 10:57am
Yeah, if you increase flowrate, it'll go faster. We're talking hooking a bigger cylinder up to the same tractor, so the flowrate is virtually the same, so the cylinder will move slower. Bigger hoses? No, bigger pump, or in more complicated modern systems, more oil delivered by the pump via it's load/ flow sensing mechanisms, but still, the diameter of the hose would mean hardly anything as far as being less restrictive. Centrifugal pump feeding a water line, totally different scenario compared to a vane, or gear or other positive displacement type pump.
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Posted By: Tbone95
Date Posted: 05 Nov 2019 at 10:59am
In your equation, 19.25 comes from dividing 144 by 7.48. 144 is conversion of square feet to square inches, 7.48 is converting gallons to cubic feet. It's my equation pre-worked out for you!
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Posted By: jaybmiller
Date Posted: 05 Nov 2019 at 11:27am
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here's where I borrowed it from... https://flodraulic.com/formulae/basic-hydraulic-formulas" rel="nofollow - https://flodraulic.com/formulae/basic-hydraulic-formulas .. too many equations and numbers for me today... head hurts from looking at the garbage truck and seeing the can of worms hydraulics on it ! ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |