Pulley arrangement for a belt drive and agricultural machine with such

A belt drive for an agricultural machine, the belt drive comprising:

• a pulley arrangement including
• an input shaft having a first end and a second end, the first end of the input shaft configured to be couplable to a gear box,
• a pulley mounted coaxially on the input shaft, the pulley including an opening, the input shaft extending through the opening,
• an inner pulley surface,
• an outer pulley surface, the opening extending from the inner pulley surface to the outer pulley surface, and
• at least one ring disc fastened coaxially to the inner pulley surface or the outer pulley surface, the at least one ring disc defining a plurality of air flow directing protrusions, grooves, or both protrusions and grooves, each extending from an inner diameter towards an outer diameter of the ring disc, and wherein a circumferential ring disc gap is provided between the at least one ring disc and the input shaft, and
• wherein the plurality of air flow directing protrusions, grooves, or both protrusions and grooves is disposed proximate to the opening.

An agricultural machine, comprising:

• a belt drive including a pulley arrangement, the pulley arrangement including
• an input shaft having a first end and a second end, the first end of the input shaft configured to be couplable to a gear box,
• a pulley mounted coaxially on the input shaft, the pulley including an opening, the input shaft extending through the opening,
• an inner pulley surface,
• an outer pulley surface, the opening extending from the inner pulley surface to the outer pulley surface, and
• at least one ring disc fastened coaxially to the inner pulley surface or the outer pulley surface, the at least one ring disc defining a plurality of air flow directing protrusions, grooves, or both protrusions and grooves, each extending from an inner diameter towards an outer diameter of the ring disc, and wherein a circumferential ring disc gap is provided between the at least one ring disc and the input shaft, and
• wherein the plurality of air flow directing protrusions, grooves, or both protrusions and grooves is disposed proximate to the opening.