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Tractor Talk Discussion Forum

Hyd/Oil pump design

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Dave (IL)

02-11-2005 08:49:05




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What would be a typical application for a gear pump with 2 equal size gears running in a figure 8 cavity? Oil, hydraulic, injector, or ... ?




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williamf

02-11-2005 14:14:11




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 Re: Hyd/Oil pump design in reply to Dave (IL), 02-11-2005 08:49:05  
That would include the Farmall Liftall. BTW: The manual that I got for the one in my H is, far and away, the best written technical manual I have ever come across. After years of owner's manuals written by engineers for whom English was a second language it was a pleasure to read.
Wm



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buickanddeere

02-11-2005 13:39:04




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 Re: Hyd/Oil pump design in reply to Dave (IL), 02-11-2005 08:49:05  
"Low to medium Pressure", high volume and used with open center systems.



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Dave (IL)

02-11-2005 21:21:58




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 Re: Hyd/Oil pump design in reply to buickanddeere, 02-11-2005 13:39:04  
Yes, would have said open center based on some earlier research I was doing.
Would medium pressure pre clude fuel injection pumps?
These are pretty small. Probably only about 2" center to center on the shaft so that would be about 2" gears.
Or I could be totally off base as to what they are.



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J. Schwiebert

02-12-2005 05:44:35




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 Re: Hyd/Oil pump design in reply to Dave (IL), 02-11-2005 21:21:58  
On the injection pumps, gear pumps have been used as Charge Pumps to fill the injection pump. Probably no pressures higher than 60 psi. You have no means of metering the fuel also timing the fuel and you can not develop the pressure necessary for todays engines. They can also be used on closed center hydraulic systems, but you must have an unloader valve to unload the pressure. Do you have the formula that allows you to calculate the displacement of these pumps?

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Dave (IL)

02-12-2005 20:07:49




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 Re: Hyd/Oil pump design in reply to J. Schwiebert, 02-12-2005 05:44:35  
I have a couple sites that have more info than I need right now. Ain't smart enought to ask the next question.

Thanks to all for input.



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J. Schwiebert

02-11-2005 08:53:43




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 Re: Hyd/Oil pump design in reply to Dave (IL), 02-11-2005 08:49:05  
Gear pumps as you mention are very popular hydraulic pumps. Many engines also use gear type oil pumps. Are there any identification markings such as a name or numbers on the pump. From what material is it constructed?



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Dave (IL)

02-11-2005 09:24:51




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 Re: Hyd/Oil pump design in reply to J. Schwiebert, 02-11-2005 08:53:43  
I don't have a particular pump. My son is a robotics engineer finishing up the first phase of a project making bearing blocks for these. We just got to discussing the various types of oil/hydraulic pumps and their potential applications. I know oil pumps are like this, but didn't have any experience with hydraulic or injector pumps made like this.

One of the things that got us discussing this is the company is ramping up for production rates of 10's of thousands a month, maybe more.

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thurlow

02-11-2005 09:15:44




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 Re: Hyd/Oil pump design in reply to J. Schwiebert, 02-11-2005 08:53:43  
Were.....maybe still are, haven't used one for about 25 years..... .also popular in sprayer applications for farm chemicals..... ..Well, maybe not; the ones I remember only had a single gear.....



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Ken Macfarlane

02-11-2005 10:05:11




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 Re: Hyd/Oil pump design in reply to thurlow, 02-11-2005 09:15:44  
The general type of pump is called a positive displacement pump. Gear pumps, vane pumps and piston pumps are all in this category.

In a gear pump, the fluid travels around the outside of the figure 8 and out the discharge.

Oil pumps, fuel pumps, hydraulic pumps etc have all used this design.



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