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 (46A, 46B) mesh at all angular positions. Each gear of the oval gear set 46 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 95 extend from the root profile RP wall. Each of the gear teeth 95 has a pair of contact surfaces with circular involute curve profiles (IC1, IC2).