FIELD: agricultural engineering.
SUBSTANCE: invention relates to agricultural engineering, in particular to the working members of seeders of an agricultural machine, which ensure furrow closure. Semi-hollow tyre having an axis of revolution comprises a sole capable of being mounted on the periphery of a rotary support, a tread opposite the sole, and two sidewalls each connecting the sole and the tread so as to form together a cover which defines an uninflated chamber inside the pneumatic tyre. Tread has a concave profile in a plane passing through the axis of revolution, and tyre comprises two annular ridges which extend, respectively, the two sidewalls in the outer radial direction and which are connected to two opposite ends of the tread. Two annular ridges define, respectively, two principal directions which intersect at an acute angle so that, when the tyre comes into contact with soil, by being subjected to a vertical load, the two annular ridges move closer together locally in such a manner as to exert a pinching effect on the soil, causing an increase in the concavity of the tread and an increase in the angle.
EFFECT: such a structural solution ensures the closure of the furrow on any soils or soils.
16 cl, 23 dwg
