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Thread: Hand operated trailer mover
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8th Jul 2022, 12:27 PM #31Most Valued Member
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Forgot there is this video below showing the noise the original mover makes its very loud and uninmaginable using that at 3am to load the boat up while my neighbors main bedroom is 2 meters from my driveway
https://youtu.be/rTxCv_nFh1I
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9th Jul 2022, 04:55 PM #32
A small car may have 300Nm at the wheel in top gear. at max torque revs, but I doubt it. It would be more like 3 or 4 times that! Still in top gear!
In first gear, the assumption being that you would move it around your yard in 1st, the torque at the drive wheels will be: engine torque x 1st gear ratio x diff ratio.
So let's say an average car engine makes 300Nm x (1st gear ration of 4:1) 4 x (diff ratio of 3.5:1) 3.5 = 4200Nm at the axle.
Then the force at the wheels is (axle torque) 4200Nm / (half wheel diameter) 0.38m (for radius or force arm) = 11,000N = 1122kgf, so about 6x the force you measured to move your trailer.Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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9th Jul 2022, 08:34 PM #33Most Valued Member
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Wow that's huge i always assumed the rating was the maximum output
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9th Jul 2022, 08:37 PM #34Most Valued Member
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Does anyone have any input on a gear box design for the gearing that will be the lightest design but maximum strength?
I was thnking of placing ghe 3 gear sets in a triangle shape in a square box using 3-4mm sheet/plate steel
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9th Jul 2022, 11:06 PM #35
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10th Jul 2022, 02:13 AM #36
Maybe buy Tesla plenty of juice then
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11th Jul 2022, 11:21 PM #37
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12th Jul 2022, 06:06 AM #38Most Valued Member
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13th Jul 2022, 12:10 PM #39Most Valued Member
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Got my sprockets today im going to go for that triangle config as pictured it should keep the gearbox tight and small in size
I went with 428 pitch chain and sprockets and i will be using 20mm shafts for the gearbox unsure on a axle size yet
I double checked the 1000watt motor and it puts out 4nm at 48volt it cal also run at as little as 11volts unsure if im going with a motor kit that comes with a speed controller and thumb controlled variable throttle or if to just wire it up on/off to a 12-13volt lithium lifepo4 battery
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13th Jul 2022, 02:25 PM #40Most Valued Member
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If i get a couple small wheels from bunnings with axle bearings do you think i could use perminant loctite to lock the axle to the bearings and bearing to the hub?
Will that hold under the load? It will cut out a lot of fabrication and welding
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13th Jul 2022, 07:17 PM #41Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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13th Jul 2022, 10:38 PM #42Most Valued Member
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Yeah your right Jhovel im going to use the wheels off my other trailer mover and buy some hubs this time instead of fabricating my own i will just need to drill out the 17mm spline hole to 20mm, searching now for a 20mm drill bit
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15th Jul 2022, 02:39 PM #43Most Valued Member
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I purchased the correct hubs for my wheels once they arrive i need to do some drilling, the hub centers or splined 17mm so they need drilling out to addapt my 20mm all round drive shafts and axles
The small sprockets are 19mm inside diameter so i grabbed a 20mm drill bit from CTool on ebay he usually has high quality drill bits
The actual frame i need to get laser cut from 5mm plate steel if its available so its an order job
Motor hasn't been picked out yet still deciding to go 500watt dc, 1000watt dc or if i want to venture into 220-240v ac
My old trailer mover will be getting used shortly so i can go wet a line and loose some monofiliment
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19th Jul 2022, 09:29 PM #44Most Valued Member
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This is how the gearbox will be made, here are the gears all chained up
The little sprocket on the right will be connected to my motor/input sprocket
The big sprocket on the left will be my final drive gear the drive shaft will be welded to that sprocket
Gearbox will be around 55cm wide and 15cm high the gearbox will be half closed/half open to access the chain
I plan on shimming the drive shafts with M20 washers and applying grease before assembly, i may still use pillow block bearings or i may run oilless bushes
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26th Jul 2022, 05:42 PM #45Most Valued Member
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Received my steel today to build the chassis of the gearbox just need to assemble the drill press and get some good weather to start welding
All the material is 6mm
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