Air compressor provided with belt guard

Air compressor comprising:

• a reservoir containing compressed air, a pump unit for producing compressed air to be fed to the reservoir, a motor for driving the pump unit, a transmission belt wound around a driving pulley torsionally coupled to a shaft of the motor and around a driven pulley torsionally coupled to a shaft of the pump unit to transmit torque from the shaft of the motor to the shaft of the pump unit, wherein the spokes of the driven pulley connecting the hub of the driven pulley, which is mounted on the shaft of the pump unit, to a ring of the driven pulley, around which the transmission belt is wound, are shaped as fan blades, wherein that the driven pulley transmits torque to the shaft of the pump unit and cools the pump unit,
• a belt guard 404 which encloses the transmission belt, the driving pulley and the driven pulley, and
• wherein the belt guard is made as a cover and comprises a front wall, in which slits are provided for allowing air drawn from outside by the spokes of the driven pulley acting as fan blades to flow therethrough, a side wall which encloses laterally the space around the transmission belt and around the driving pulley and the driven pulley, and a rear wall which closes on a rear side space around the transmission belt and around the driving pulley and the driven pulley, and has an opening for receiving the pump unit wherein air drawn from the outside through the slits provided in the front wall of the belt guard is conveyed towards the pump unit,
• wherein the rear wall of the belt guard is configured to cover the pump unit by at least 30% of a depth of the pump unit along a direction of an axis of the shaft of the pump unit.