SEEDING UNIT FOR DRILL Russian patent published in 2003 - IPC

FIELD: agricultural engineering. SUBSTANCE: seeding unit has frame, hopper, and seeding device attached to hopper lower part and equipped with drive and casing. Lower throat of hopper is defined by two sleeves, which are rigidly connected to hopper. Sleeves are arranged concentrically with respect to one another and connected through centering rings to one another. Hopper internal cavity is communicated with internal sleeve cavity. Internal sleeve is made longer than external sleeve and has conical part at its end. Support in bore of seeding device casing makes seat for ball bearing outer race. Ball bearing inner race is positioned in holder mounted on outer sleeve so as to be fixed relative to said sleeve in different positions in vertical plane. Support in seeding device casing bore and outer race of ball bearing in support are fixed by stop rings. Connecting surfaces of brackets are uniformly spaced from casing axis. EFFECT: improved quality, enhanced reliability in operation of seeding unit and wider operational capabilities. 2 dwg