APPARATUS FOR REDUCING SOIL COMPACTION BY DRILL WHEELS Russian patent published in 2008 - IPC A01C7/00 

FIELD: agricultural engineering.

SUBSTANCE: apparatus has rollers connected to drill frame through lifting-lowering mechanism made in the form of longitudinal levers which are joined with their rear ends to rollers and pivotally joined with their front ends to drill frame. Hydraulic drive is connected to drill frame and longitudinal levers. Rollers are positioned with their mid lines in plane extending through mid line of drill wheel rims. Rear ends of longitudinal levers are joined with rollers by means of bushings freely put on said ends. Bushings are fixed on poles pivotally joined with roller pins. Flange is provided on each rear end of longitudinal lever protruding relative bushing. Compression spring is placed between flange and bushing. Hydraulic drive is made in the form of paired hydraulic cylinders corresponding to longitudinal levers. Each of hydraulic cylinders is connected to respective longitudinal lever by means of two pivot links pivotally hung to power stem. Front link is pivotally connected to longitudinal lever and rear link is pivotally connected to bushing. With power stem retracted into hydraulic cylinder casing and compression spring rested upon flange in its minimally strained state, front and rear pivot links are arranged at an acute angle with respect to each other.

EFFECT: increased efficiency by reduced compaction of soil by drill wheels.

3 dwg