Everything You Need To Know To Find The Best hydro drive motor

Mandres said:

Thx for the input A_Pmech. Sounds like I'll need come up with an accurate estimate on the total weight first and foremost.

I was thinking that the wheel motors used on ZTR mowers might at least be a good starting point. Does anyone know what type and displacement of motors are typical there?

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Correct. Weight equals traction. Under average soil conditions about 75% of the vehicle weight can be developed as tractive effort. (Lots of papers on agricultural tire efficiencies.)

To steer, you will need a fairly large amount of excess wheel torque to generate the slewing action.

To calculate motor torque, multiply the estimated weight of the vehicle by the traction efficiency. (.75) in this case. That is the amount of tractive effort the machine will produce.

Now divide the tractive effort by the number of wheel motors. This is the amount of effort each motor must produce assumimg the machine has equal left-right weight distribution.

Now divide the tractive effort by the inverse of the wheel radius in feet. This is the torque at the wheel hub to generate peak tractive effort.

Now divide that by the reduction ratio of the gearbox driving the wheel set. This is the torque at the motor output shaft in ft. lbs.

Multiply that value by 1.2 to account for dynamic efficiency of the reduction drive and then by 3 or more to provide sufficient torque for slewing.

Now you can cross-check the power of the drive to see if it meets your minimum speed requirement. (Power) 1hp is 33,000 ft. lbs. / min.

Correct. Weight equals traction. Under average soil conditions about 75% of the vehicle weight can be developed as tractive effort. (Lots of papers on agricultural tire efficiencies.)To steer, you will need a fairly large amount of excess wheel torque to generate the slewing action.To calculate motor torque, multiply the estimated weight of the vehicle by the traction efficiency. (.75) in this case. That is the amount of tractive effort the machine will produce.Now divide the tractive effort by the number of wheel motors. This is the amount of effort each motor must produce assumimg the machine has equal left-right weight distribution.Now divide the tractive effort by the inverse of the wheel radius in feet. This is the torque at the wheel hub to generate peak tractive effort.Now divide that by the reduction ratio of the gearbox driving the wheel set. This is the torque at the motor output shaft in ft. lbs.Multiply that value by 1.2 to account for dynamic efficiency of the reduction drive and then by 3 or more to provide sufficient torque for slewing.Now you can cross-check the power of the drive to see if it meets your minimum speed requirement. (Power) 1hp is 33,000 ft. lbs. / min.

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So I'm in the works of building a mini dozer similar to the Struck Corp MD750 and the MT1800/2000, with independent hydraulic wheel motors vs doing a hydrostatic transaxle and putting brakes on each axle. Expected weight is going to be around 800lbs, possibly higher. What this will be used for is pulling a plow for gardening or other ground engagement, as well as having a front loader for moving snow, dirt, gravel, or sand. Would like to use a Honda GX390 or possibly a Briggs 16hp V-twin, depending how much power I'd need.

Where my first problem is, I'm not sure what size hydraulic motor I would need for the drive. I'm either going to use dual #80 roller chain or maybe ca550 chain, if I can get 9-10" diameter sprockets. I would also like to do a gear reduction, in that, from the wheel motor there would be a 10 tooth #40 sprocket to a 35 tooth sprocket on an axle to the track sprockets. I've looked at using zero turn mower wheel motors on surplus center from Hydrogear, but I don't want to go much faster than 2-3 mph; and most of them were rated for 5-10mph, depending on model. So I'm not sure what way to go.

Next part is hydraulic pump size for everything. I'm not sure what size I would need to use the motors and using the front loader at the same time. The front loader will utilize 2" bore and 18" stroke welded cylinders for the arms and a 2" bore 10" stroke cylinder for the curling of the bucket. Frame of the mini dozer and front loader will be made from 2"x4x1/8" tubing, as it'll be more than adequate for the whole thing.

Another reason I wanted to stay away from the zero turn wheel motors is, I'm not sure how long they would last for ground engagement. This isn't some toy, it will be used and I'd like it to last for years. When I looked at the MD750 in the manual, they don't mention the specs of the wheel motors or the size of the hydro pump.

Main inspirations was the model from the mini dozer near complete build on here from a few years ago.

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