Seed distribution element for precision seed drills, seed drill including said element

摘要

A seed distribution element (1) includes: —a sowing disc (16) rotated by a motor-driven transmission shaft (20) —a housing (10) with a fixed portion (11) in which the shaft (20) is supported and a portion (12) movable relative to the fixed portion and can be closed against it, with a seed collection chamber (15) in the fixed portion (11) and a pneumatic suction chamber (17) in the movable portion (12), —the sowing disc (16) being interposed between the portions (11, 12) and having opposed surfaces (16a, 16b) delimiting the chambers, and provided with a ring of selector holes (23) extending between the opposed surfaces structure for producing a pressure differential between the opposed surfaces in the region of a circumferential segment of the ring of holes, including the pneumatic suction chamber, and —a seal (24) on the movable portion (12) capable of sliding contact with the facing surface (16a) of the disc (16) when the portions are closed against one another,—a thrust-bearing element (26) of the sowing disc (16), supported rotatably in the movable portion (12), to withstand the axial load produced by the disc (16) on the seal (24).

主权项

1. A seed distribution element for precision pneumatic seed drills, comprising:
a sowing disc which is rotated by a motor-driven transmission drive shaft at controlled speed, a housing with a fixed portion and a portion which is movable relative to the fixed portion and can be closed against the fixed portion, a seed collection chamber being defined in the fixed portion, a pneumatic suction chamber being defined in the movable portion, the sowing disc being interposed between the fixed and movable portions and having opposed surfaces delimiting the chambers, the sowing disc having at least one ring of selector holes extending between the opposed surfaces, and a seal which is arranged on the movable portion and is capable of sliding contact with the facing surface of the disc when the fixed and movable portions are closed against one another,
wherein a pressure differential is provided between the opposed surfaces in the region of a circumferential segment of the ring of holes,wherein the seed distribution element further comprises a thrust-bearing element of the sowing disc, which thrust-bearing element is supported rotatably in the movable portion in order to withstand at least some of the axial load produced by the disc on the seal.