Patent ID: 9146089
Filing Date: 2015-09-29
Classification: G01B,G01M

Abstract:
1. An apparatus for measuring a manufacturing deviation in an external gear; the apparatus includes: a stationary central pin that is adapted to receive the gear and has an external diameter smaller than the internal diameter of the gear so that a relative movement between the gear and the pin is allowed; a coupling member that is movably mounted beside the gear and is adapted to fit into the teeth of the gear; a thrust device urging with a predetermined force the coupling member against the teeth of the gear in order to concurrently cause the coupling member to fit into the teeth, and an internal, lateral surface of the gear to contact an external, lateral surface of the pin; sensor devices for determining the position of a central axis of the gear; and a control unit determining the manufacturing deviation in the gear as a function of the position of the central axis of the gear; wherein the coupling member includes a head that does not rotate and is adapted to fit into the teeth of the gear.