INVOLUTE GEAR TEETH FOR FLUID METERING DEVICE

摘要

AN OVAL GEAR SET 46 FOR USE IN A FLOW METER (28) COMPRISES FIRST AND SECOND GEARS (46A, 46B) THAT ARE IDENTICAL TO EACH OTHER AND THAT ARE CONFIGURED TO ENGAGE AT A FIXED CENTER-TO-CENTER DISTANCE (CD) SUCH THAT THE FIRST AND SECOND GEARS MESH AT ALL ANGULAR POSITIONS. EACH GEAR OF THE OVAL GEAR SET COMPRISES A HUB AND A PLURALITY OF GEAR TEETH (95). THE HUB COMPRISES AN OVAL BODY (99A, 99B) HAVING A MAJOR AXIS AND A MINOR AXIS EXTENDING THROUGH A CENTER (100A, 100B) OF THE HUB, AND A ROOT PROFILE (RP) WALL CIRCUMSCRIBING THE MAJOR AND MINOR AXES. THE PLURALITY OF GEAR TEETH EXTEND FROM THE ROOT PROFILE WALL. EACH OF THE GEAR TEETH HAS A PAIR OF CONTACT SURFACES WITH CIRCULAR INVOLUTE CURVE PROFILES (IC1, IC2).