Hydraulic gear motor, how it works

[63MrJanko]

creo que esto no es un motor hidraulico, es una bomba hidraulica, uno de los engranajes es accionado por un vastago unido a normalmente el arbol de levas de un motor de explosion o diesel, haciendo girar al otro eng,. y de esa manera suministra presion hidraulica al sistema de lubricacion de dicho motor. no se debe confundir, no creo que oueda trabajar como motor hidraulico.

[overtakerism]

Construction design same

[betneth]

what is the purpose of the case drain and where it is going,, into the tank?

[camilohrueda]

@betneth In a hidraulic motor, there can be times when both ports are going to have high pressure at the same time. When this happens, the shaft seal can blow up unless the chamber behind it is connected to the tank. This allows all the internal leaks to go freely to the tank.

[betneth]

@camilohrueda ;; thanks for the info man,, im a hydraulic mechanic also,, specialy on earth moving machine,,,thats why i know little about hydraulic.... hehehehehe.... thanks a lot again,,,,

[camilohrueda]

@betneth NOP!

[lightrose100]

@camilohrueda ..Hi .I got a question if you could help me out i'd appreciate it very much, I;m trying to get 80 foot pound of torque @ 1000 r.p.m on a hydraulic motor, what size or kind of pump do I need and what h.p electric motor do I need? thanks!

[Joscope]

@lightrose100

36cc motor, 1000RPM, 96%vol eff, 92%mech eff

22cc Pump, 1757RPM, 97% vol eff, 92% mech eff

20HP Electric Motor (1750RPM)

System pressure = 3000PSI, System Flow = 9.91GPM

Start with the motor, calculate requ. hp, flow, torque, apply to the pump, find torque and speed data and solve for engine requ. HP = GPM *PSI / 1714* eff.

[justlivemyway]

@betneth

Case drain is due to the relieved tolerances on the pump components so that some oil seeps through and acts as a lubricating media. After its lubrication purpose is achieved, the left over oil in the base of the pump has to be recycled and is sent back to the accumulator tank through filtering.

[azremyyyyyy]

which one more better,hydraulic motor or electrical motor

[camilohrueda]

@azremyyyyyy  It depends on the application, and many more factors.

[angelvetto19]

@azremyyyyyy well i have used a lots of winches (PTO, electrics and Hydraulics, manuals) and in my opinion if you compare electric vs hydraulic, the hydraulic will beat a electric forever

[Az3arization]

Do you have an equation to calculate pressure vs. torque and vice versa

[camilohrueda]

@Az3arization Yes, please visit our website hidraulicapractica(dot)com, formulas and software. thanks

[Az3arization]

@camilohrueda Thank you very much !

[Mikel69er]

How do you determine the rotation of a geer pump

[camilohrueda]

@Mikel69er The port fed with the oil flow determines the rotation o f a gear motor.

[harrihealey02]

The gear roters are not sealed so the oil can just slip behind the metal gears and not be efficient, can someone tell me how that dosen't happen? I love hydraulic lifts I just want to know wit all that weight..

[camilohrueda]

@harrihealey02 the reason is, there is a little percentage of slippage (loss of flow) inside the pump (~5%). the gap or distance between the gear tooth and the wall (gear housing) is around 0.002" depending on the type, max pressure and many other factors. Basically, the flow that is allowed to pass through all the internal components inside these pumps is for lubrication purposes.

[harrihealey02]

@camilohrueda Ah I see, thank you for explaining. :)

[1234Doc4321]

@harrihealey02 Plus the fluid will follow the path of least resistance which will be path where it needs to go.

[batchm8]

what was the difference of APPA D74( i cant read the manufacturers name) to ALPA D34 (marzocchi) pls help me

[eddragon76]

very well explained .. would be possible to make a mini hydraulic pump from this same principle? to thinking about doing a mini excavator as a hobby

[camilohrueda]

@eddragon76 Actually, i have a video posted in hidraulicapractica(dot)com that shows a german guy that made a mini hydraulic dump truck. he made up everything, the pump, valve, cylinder.

[hairuldin1995]

This video is awesome.At least i get to know it. Anyway, i'm a mechanician. In school.

[PumpManufacturers]

nice set of teeth there

[75echo]

Very nice, i have attached a video of my own model in action.

[Fuzzybeanerizer]

As the gear teeth approach meshing together near the center there is a space at the "gullet" of each pair of teeth on one gear where a sealed or nearly sealed space is formed by the incoming tooth of the opposite gear. That space then becomes smaller, approaching zero volume. Since oil is not much compressible, how is that trapped oil vented out?

[camilohrueda]

@Fuzzybeanerizer That space is never closed. The gear tooth only have one point of contact with the opposite. Each teeth only touches one opposite one, not two.

[Fuzzybeanerizer]

@camilohrueda But isn't one gear just idling? If there is a clearance on one side of a tooth, what is to prevent that from becoming half as much clearance on both sides of the tooth, opening a path through the motor or pump for oil "slippage"?

[camilohrueda]

@Fuzzybeanerizer there are 2 teeth (1 from the shaft gear and 1 from the other) always touching each other in any angle of rotation preventing oil from coming from high pressure side to the other.

[Fuzzybeanerizer]

@camilohrueda Well what I'm saying is, what is holding the two teeth in contact if there is no contact on the opposite sides of those two teeth with the next 2 teeth coming in or going out? Why would the contact between them not blow open?

[camilohrueda]

@Fuzzybeanerizer . tHE PRESSURE KEEPS THEM TOUCHING EACH OTHER.

[Fuzzybeanerizer]

@camilohrueda Hmmmmmm... I guess that does make sense if one gear is driving a load directly and the other is under the same pressure but only driving the load through contact with the first gear.

[camilohrueda]

In mobile hydraulics, you only see hydraulic motors. In Industrial hydraulics you see both, but it really depends on the application.

[azremyyyyyy]

and which one is better.motor use hydraulic or electrical powerlike 3phase

[azremyyyyyy]

hi.i want to know how to services hydraulic motor.and my motor always over heat

[camilohrueda]

@azremyyyyyy This a very general question. If the motor is giving less rpm than it use to do, if it is fed with the same flow, that would mean that the motor would need service. To service it, it has to be torn apart and and all its internal parts measured and compared with original specs. inspected for broken seals etc. Replace partsthat are worn out, seals and reassembled.

[azremyyyyyy]

which one more better.hydraulic motor or electrical motor

[KlutterKing]

Thank you for contributing to Youtube. One day someone is going to put all of the info together and come up with some revolutionary innovations. Personally, I believe that there is a way to harness the braking force of a vehicle. To anyone who can answer: If this motor is in a stationary state and the arbor is turned, will this begin to add pressure to the hydraulic system?

[tyewalkerfm1]

looks just like an oil pump on most diesel engines, works the same too....only in reverse.

[janedoe1024]

FordsRule351

You're a retard!

[m1aws]

OOPS!

Gear pumps make hydraulic motors like turning the wrong end of a worm drive.

Sorry but this is a major mistake. The efficiency of this is very low indeed.

[Poundin346]

This Is A Pump Buddy

[camilohrueda]

@Poundin346,

a pump convert mechanical power from a primer mover like a diesel engine into hydraulic power (flow and pressure). a hydraulic motor (this is the case), receives hydraulic power and converts it into mechanical.

camilo

[pzpepsi]

@camilohrueda i honestly believe this is the future of hybrid vehicles. gas/electric is gonna get pushed aside for diesel/hydraulic

[camilohrueda]

that is really going to depend on the torque & rpm needed. there are some like 1/2 lb

[jaybeefun]

haw small and light can these be made? I need one for a prototype parachute design

[Jayc2400]

Can anyone explain to me what it is when a piston pump gives a low volume rate but will deliver fluid at high pressure (High Delivery Head)? Or did I misunderstood something? I'm new with hydraulics.

[VEERENDRA21]

Very knowledge ful topic.

[Apis4]

Could you pressurise the fluid (would it even have to be oil) via a green system such as an electirc pump, I am interested in this, its fascinating... I see great potential for control of power etc etc... but I how much drive can it generate, do you need to use oil, and could you use it in conjunction with green power? If so, anyone have a link or now if this has been put into non heavy plant vehicles, like an every day car/bike?

[gamerboy125]

@Apis4 it doesnt have to be oil it could be the filling in a oreo cookie and you can use an electric prime mover (motor) to run the pump but i have never heard of a electric hydraulic pump

[FordsRule351]

kinda pointless if you have to have another pump to pump the fluid to this motor to make power..

[camilohrueda]

@FordsRule351

not really, hydraulic systems don't make power, they transmit power. What makes hydraulics so helpful is that you have total control over the torque & rpm in the motor 's shaft (output) among other reasons.

[dirtjumper23]

@FordsRule351 allows you to choose how much power to transmit, also allows the change in axis of the power, like in a lawnmower, without the need for bevel gears

[iryshrovrs]

16 year Aircraft Hydraulic guy here... The difference between a hydraulic pump, and a hydraulic motor, is which way the energy input/output is going. It is the same component. If the fluid is turning the shaft, then it is a hydraulic motor. If the shaft is pushing the fluid, then it is a hydraulic pump.

[iryshrovrs]

Case drain is a little bit of "blow by" which lubricates the gears, and allows the system to move freely. Once the fluid has passed into/through the case drain system, and enters the case drain hose, then it does in fact move on to the return line, and go back to the reseviour. Or overboard.

[iryshrovrs]

In the video, he manipulates the speed at which the shaft turns by turning the output knob. When he does this he is reducing the fluid flow through the pump. The fluid input to the pump is regulated by a Relief valve, as CAMILO said.

[iryshrovrs]

All Hydraulic systems should have 1. a reseviour 2. a pump 3, a relief valve, 4. a reason to exist... IE: motor/actuator. and of course 5. hoses/tubes to get the fluid from place to place. Hope this helps!

[camilohrueda]

@iryshrovrs hi there, you are absolutely right.

although there are some differences.

[imalvincris]

@iryshrovrs what the hek man ur a genius..

[XELA2T]

Good video,

all this hydraulic stuff is so expensive because of best material and extraordinary

tiny tolerances everything must be made in a 1000/mm range.

BTW. Good drummer at the 2nd part of the music too (this is so difficult to play).

[shloop4]

does a hydraulic pump work in just the same way?

[ZombieCyborgJesus]

@shloop4 Not necessarily. For a hydraulic gear pump (not motor), an outside source provides the turning motion for the gears, as they mesh together to pressurize the oil.

[disndat11]

Question.

So the oil is being pumped by some sort of an external motor or a compressor. What if you turn the outlet valve off as he did, won't pressure build up in the motor or the pump that is supplying the pressure? Will that not damage the pump or the motor?

[camilohrueda]

@disndat11 , the oil is pumped by an external pump, the valve can be closed because there is a valve called "relief valve" that limits the pressure built up sending the oil back to tank. It is adjustable, also.

regards,

[disndat11]

@camilohrueda

Thank you for that. It makes sense to me now.

[TGAcodes]

great video

[Benjimindle]

easiest way to get a grasp of how these work.

[74LS374]

I don't understand. First video is Gear pump and the second is about running the hydraulic motor. So Where is the "how Hydraulic gear motor work" ? (According from the title : "Hydraulic gear motor, how it works")

[oivxvio]

The "pump" and the "motor" you refer to are one in the same. The "pump" that you refer to is really an internal view of the motor. The "motor" you refer to is the assembled actual motor in operation. Gear motors often can also operate as pumps because of the similarity.

[gnocbuster95]

good idea i want use it for car's motor

[everdadful]

Thank you camilohrueda.

Some of the comments are surprising. This IS the oil pump in almost ALL car engines, for 100 years!

As camilohrueda shows, it works great as a hyd. motor as well, (which this one is).

Power the shaft = hyd. pressure. Hyd pressure in, = power out of shaft, video.

One of the more reliable parts of an engine, they hardly ever fail.

Very easy to build in a home metal shop but why? All sizes available as rebuilds at auto parts store. Hyd. motors on ebay, in catalogs etc.

[eddragon76]

hi, this pump to move in rotation that the engine needs work?

with the help of a lathe, it would be possible someone build a mini pump just like this at home

[wdwalker861]

Showes ya very well in a piston pump it is like a fire hose, looks as they just built this pump and they are ready for case drain on a gear pump TO ME THAT IS FUNNY AS HELL. rebuilt pump with a case drain I would hope ya had very little

leakage or did ya have gallons how mush presure 350 on most items i did work on but I have not worked for 17 or so years

[shotgunwalter]

case drain is like "blow by" in a combustion engine...tells you how much wear is present

[meshuggah6pantera]

THANK YOU!!!!! I have been tring to figure out how the hydraulic suspension on my Monte Carlo works, and ive looked at tons of videos and never could get a good understanding till now. thanks alot =]

[jlaudio10w07]

Hydrostatic Drive

[thud153]

Most gear pumps are used for aircraft but they have to be primed to work well

[qAyyUm]

this kind of thing is for wat? truck? car? or wat?

[deaftodd]

Whats the case drain? so it leaks a little and flows back to the reseviour?

[deaftodd]

what intrigued me was how did they made such a good seal with those teeth against the wall?

[camilohrueda]

Very close tolerances when manufactured.

[deaftodd]

apparently must be. how it compensate with thermal expansion? must be a certain kind of alloy, then.

[DanFrederiksen]

the liquid can be the equalizer

[camilohrueda]

hi, for the garbage truck you probably need a single pump with 2 gears on it one suction and one outlet + external directional valves, cylinders, tank, relief valve, etc

for the valve you can do something like in my directional valve video with 1 spool per cylinder that you need.

R u using air or oil?

[skl1cent]

Hi, did u make this yourself? looks awesome, i need something like this for an rc truck. Whats the limp to this? 1 spinning rod? and do you need a fan to blow air into it to make the air pump in n compress? and how many outputs can this have. Im looking to make one to power 2-4 small hydraulics and im trying to make it power off the punisher shaft in the middle of the truck. to make a garbage truck with a working compaction bay.