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Tractor Talk Discussion Board

Sizing a hydraulic motor

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Posted by Weldon K on November 15, 2012 at 18:50:39 from (

I need some input from some of you guys who have knowledge in mechanical engineering . Needed are recommendations for selecting the size of a hydraulic motor that will power a device that I plan to build and install on skid steer loader. The device will be used to gather loose rocks from surface of tilled soil by driving slowly across land and having device sweep/kick rocks into bucket. Rocks would be from cantaloupe size down . I intend to build a framework that will be bolted to the bucket of the skid steer loader. Frame will be mounted in front of bucket and will carry a rotor mounted on pillow block bearings. Rotor will be built of square steel tubing (either 4 inch or 6 inch) with 4 inch long flat bar stock teeth welded to flat surfaces of the tubing. Spacing of teeth will be probably 3 inch and alternating from one surface of tubing to the next in effect giving a 1-1/2 inch spacing. Rotor will be chain driven by a hydraulic motor powered from skid steer axillary valves. I would like the rotor to turn at about 100 rpm or so but yet be adjustable to more or less depending upon conditions and how it turns out that the thing works. Depending on the rated rpm speed of the motor used, a portion of the speed reduction from motor to rotor could be by ratio of sprockets. Additional speed control will be through hydraulic flow control valve plumbed into input line to hydraulic motor.

Specs for hydraulic system of skid steer are as follows:
13.0 gal. min. at 1150 psi
System relief 2600lbs at quick couplers.

I want a motor that will have adequate power and speed capacity to do the job but also do not want overkill. With the above information , can anyone make a recommendation for a size motor that will do what I need?

Knowing that hydraulic motors are reversible and realizing that there may be times when the rotor may need to be reversed , will it be necessary to have two flow control valves, one on input and one on return to prevent excess rpm of rotor when switched to reverse? Info on flow control valves says "designed to provide flow control and shut off in one flow direction while providing free flow in the opposite direction". I would not want to have the rotor set at 100 rpm in use direction and then switch it to reverse and have it too fast, so wouldn't flow control in both directions be required? The flow from the electric controlled axillary valves is not adjustable by the operator as the system's valves are either on with full flow or off with none (no feathering action as could be obtained with conventional manually operated spool valves).

I am thinking of using # 60 roller chain and sprockets. Will this be sufficient? I'm thinking 1-1/8'' shaft through the square tubing rotor will be sufficient ( rotor will be 60" ). Is use of chain drive and speed reduction by sprocket ratio really necessary? How about a motor of sufficient size coupled directly to rotor shaft?
Most motors I am looking at in catalog have 1 inch shaft. Would 1 inch shaft through the rotor be sufficient? It would eliminate some of problem of connecting motor shaft to rotor shaft.

Any suggestions or other info that anyone can provide will be greatly appreciated.
Thanks, Weldon


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