A ground driven powered tillage device is described which utilizes a passive rolling coulter propelled through the soil by a prime mover. The reaction torque imparted by the soil to the coulter is delivered via a torque transfer unit to a powered tillage blade. The tillage blade rotates counter to the direction of the passive rolling coulter and prepares a tilled furrow of some predetermined depth for seed placement and coverage.

Analysis is presented in which the torque developed by a passive rolling coulter engaging the soil is predicted. A relationship is presented for determining the velocity ratio between the coulter and tillage blade. Finally, the shape and number of teeth a tillage blade has is expressed in terms of tillage depth and speed of the tillage blade.

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Published in Transactions of the ASAE, v. 23, issue 6, p. 1383-1387.

© 1980 American Society of Agricultural Engineers

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The investigation reported in this paper (79-2-111) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the Director.

The device described in this paper has been patented - United States Patent No. 4,136,744.