Microtractor Part Sourcing: Difference between revisions

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==Overview==
Part Sourcing for the [[Microtractor]]. Much design work has been merged into the [[Power Cube]].
[[Image:microtracpartsbuild.jpg|thumb|600px]]
==Engine==


===Sourcing===
===Sourcing===
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*[http://www.uspowerco.com/inventory_item.php?id=272 Perkins 402C 13.7hp 2 cylinder Same as above, asked for quote 3/5/09 talked to jeff]
*[http://www.uspowerco.com/inventory_item.php?id=272 Perkins 402C 13.7hp 2 cylinder Same as above, asked for quote 3/5/09 talked to jeff]


==Hydraulic Pump==


===Specifications===
==Power Cube (MicroTrac engine cube) Details==
*10.1 GPM at 3600 RPM and 2500 PSI, requires 17.3 hp to drive it - best match to available engine - [https://surpluscenter.com/item.asp?UID=2009050111530930&item=9-1897-A&catname=hydraulic]
[[Image:microtrac_couplerhalf1.jpg|thumb|Engine-side coupler half, 1" shaft, $9.86, Type E]]
[[Image:microtrac_couplerspider.jpg|thumb|Spider insert, 1" shaft, coupler half, $14.36, type E]]
[[Image:microtrac_couplerhalf2.jpg|thumb|Pump-side coupler half, 5/8" shaft, $9.86, Type E]]
 
*The coupler halves and spider are shown in the pictures, from McMaster Carr [http://www.mcmaster.com/#6408k15/=1gyaq6 page 1157]
 
==Power Calculations==
===Pump===
[[Image:hydcalc.jpg|thumb|Hydraulics Calculations from [https://surpluscenter.com/techhelp.asp?UID=2009041610053391&catname=hydraulic]]]
*From [https://surpluscenter.com/] - Pumping = 1 Hp = 1 GPM x 1500 Psi - (linear relationship i.e. 2 GPM @ 1500 Psi = 2 Hp)
**For the above pump, 14.2 gpm with 3000 psi indicates 28.4 hp requirement
*Hp to drive hydraulic pump = Psi x GPM / 1714
**For the above .97 cu in pump, 3000*14.2/1714 = 24 hp
**If we run at 2200 psi => 18 hp required
**For .86 cu in pump, need 3000*12.6/1714 = 22 hp
**For the same with 2500 psi, 18.3 hp
 
===Power Available===
*Assuming 85% pump efficiency, we have 17.5*.85=14.8 hp power available to the machine
===Wheel Motor Calculations===
 
*32 cu in wheel motor: 20 gpm, 5170 in lb torque, 145 rpm
**Using 12 gpm, 5170 in lb torque, at 87 rpm - uses 7 hp of the engine
 
===Spider Torque Rating===
The Hytrel coupler spider has a 401 in lb torque rating. This is at 3600 rpm. If this pump is driving a hydraulic motor at 87 rpm (wheel motor at 12 gpm fluid flow, at its rated torque), what would be the maximum torque that the 87 rpm could have? 401*3600/87 = 16600 in lb. That is well within the 5130 in lb torque of the wheel motor. Coupler spider will hold up.
 
 
==Engine==
[[Power Cube]]
 
==Wheels==
[[Image:Wheelmotors.jpg|thumb|32 cu in wheel motor, 5130 in oz torque, 145 rpm at 20 gpm]]
 
*one set of drive wheels in the middle balanced with the engine so the Microtrac can be rotated easily, with a motor on the side
*doubled up for traction
*have support wheels on the back sides so it doesn't tip easily
*drive wheels the same as lifetrac, 30" high 10" wide
 
 
==Resource Map==
 
Reviewers:
*http://www.tractorbynet.com/forums/build-yourself/140170-homemade-modular-hydraulic-engine.html
**No response as of 4.28.09
*http://forums.hydraulicspneumatics.com/eve/forums?a=tpc&s=4721063911&f=8641063911&m=74110526&r=74110526#74110526
**Useful response, including hydraulics primer, Mr. Hanson's contact as a consultant, etc.
**The response claims need for 30 hp if we want 15 gpm at 2200 psi. We have 12 gpm at 2500 psi.
***CadTrac uses 16 gpm pump and 18 hp engine, at 2000 psi for 1/2 of the flow (to wheels) and 1000 psi to rest of flow (loader)
Coupler info:
*http://www.lovejoy-inc.com/uploadedFiles/Catalogs/jw.pdf
*http://www.ohiobelting.com/pdfs/lovejoycplg.pdf
 
==Notes==
*On calculations (right picture) - formula for horsepower to drive pump (with 1714 factor) includes the efficiency of the pump (about 85%)


===Sourcing===
*.677 cu in, 10.1 gmp @3600 RPM, 3000 PSI max, 4000 RPM max, $180 - [https://surpluscenter.com/item.asp?UID=2009050111530930&item=9-1897-A&catname=hydraulic]


==See Also==


==Coupler==
*[[Microtractor]]
*[[Power Cube]]

Latest revision as of 03:56, 20 September 2011

Overview

Part Sourcing for the Microtractor. Much design work has been merged into the Power Cube.


Error creating thumbnail: File missing

Engine

Sourcing


Power Cube (MicroTrac engine cube) Details

Engine-side coupler half, 1" shaft, $9.86, Type E
Error creating thumbnail: File missing
Spider insert, 1" shaft, coupler half, $14.36, type E
Pump-side coupler half, 5/8" shaft, $9.86, Type E
  • The coupler halves and spider are shown in the pictures, from McMaster Carr page 1157

Power Calculations

Pump

Error creating thumbnail: File missing
Hydraulics Calculations from [1]
  • From [2] - Pumping = 1 Hp = 1 GPM x 1500 Psi - (linear relationship i.e. 2 GPM @ 1500 Psi = 2 Hp)
    • For the above pump, 14.2 gpm with 3000 psi indicates 28.4 hp requirement
  • Hp to drive hydraulic pump = Psi x GPM / 1714
    • For the above .97 cu in pump, 3000*14.2/1714 = 24 hp
    • If we run at 2200 psi => 18 hp required
    • For .86 cu in pump, need 3000*12.6/1714 = 22 hp
    • For the same with 2500 psi, 18.3 hp

Power Available

  • Assuming 85% pump efficiency, we have 17.5*.85=14.8 hp power available to the machine

Wheel Motor Calculations

  • 32 cu in wheel motor: 20 gpm, 5170 in lb torque, 145 rpm
    • Using 12 gpm, 5170 in lb torque, at 87 rpm - uses 7 hp of the engine

Spider Torque Rating

The Hytrel coupler spider has a 401 in lb torque rating. This is at 3600 rpm. If this pump is driving a hydraulic motor at 87 rpm (wheel motor at 12 gpm fluid flow, at its rated torque), what would be the maximum torque that the 87 rpm could have? 401*3600/87 = 16600 in lb. That is well within the 5130 in lb torque of the wheel motor. Coupler spider will hold up.


Engine

Power Cube

Wheels

Error creating thumbnail: File missing
32 cu in wheel motor, 5130 in oz torque, 145 rpm at 20 gpm
  • one set of drive wheels in the middle balanced with the engine so the Microtrac can be rotated easily, with a motor on the side
  • doubled up for traction
  • have support wheels on the back sides so it doesn't tip easily
  • drive wheels the same as lifetrac, 30" high 10" wide


Resource Map

Reviewers:

Coupler info:

Notes

  • On calculations (right picture) - formula for horsepower to drive pump (with 1714 factor) includes the efficiency of the pump (about 85%)


See Also