FEED SYSTEM FOR UNDERGROUND WINNING MACHINE, TOOTHED RACK AND DRIVE SPROCKET FOR IT Russian patent published in 2015 - IPC E21C29/02 

FIELD: machine building.

SUBSTANCE: invention relates to the feed system, toothed rack and drive sprocket for movement of the underground winning machine. The feed system comprises a travel drive with the drive sprocket, having teeth with symmetrical profile, and toothed racks 1 with multiple rack teeth 2; 20 located between the support plate 7 and guide plate 5 of the toothed rack. Side surfaces 14; 24 of teeth 2, 20 are inclined in the direction of travel and go apart to top 13; 23 teeth for interaction with surfaces 34 of teeth 31 of the drive sprocket 30. Two side surfaces 14, 24 of each rack tooth 2, 20 are bent concave and create a trough-shaped profile between the guide plate 5 and support plate 7 transverse to the travel direction and raising towards top 13; 23 teeth and two surfaces 34 of each tooth 31 of the drive sprocket are bent convex and create a barrel-type profile transverse the travel direction. Surfaces (34) of each tooth (31) of the drive sprocket (30) are bent convex and have the barrel-type profile transverse the travel direction for interaction with the trough-type profile made on the side surfaces of each rack tooth. At that teeth (31) have flat section (38) in zone of the central line of the barrel-type profile. The barrel-type profile in zone of the flat section is preferably flat, and/or flat section has width from 1/10 to 1/7 of teeth thickness.

EFFECT: wear decreasing due to improved interaction between teeth of the drive sprocket and rack teeth.

29 cl, 7 dwg