Patent ID: 9491901
Filing Date: 2016-11-15
CPC Classification: A01C

Claim Text:
1. Seed metering device for a row crop sowing machine, comprising: a seed metering disc rotatable about a central shaft, having a plurality of seed capturing and retaining holes for capturing and retaining the seeds, a motor, which drives the seed metering disc, releasing means for releasing the seeds from the seed capturing and retaining holes, conducting means for conducting the released seeds onto the ground, a housing for containing and protecting the metering disc, and vacuum generating means, wherein the motor is an annular hollow-shaft motor coaxially coupled to the metering disc; wherein the housing containing the metering disc forms a vacuum chamber together with a face of the metering disc, and the vacuum generating means lowers the air pressure on said face of the metering disc so as to capture and retain the seeds within the seed capturing and retaining holes arranged on another face of the metering disc opposite the vacuum chamber; wherein the annular hollow-shaft motor is coupled to the seed metering disc by a hollow hub comprising a hollow shaft or tube, and wherein the hollow hub is perforated, fluidly connecting the vacuum chamber to the hollow shaft of the motor coupled to said hollow hub.