Patent ID: 7707879
Filing Date: 2010-05-04
Classification: G01B,G01M

Abstract:
1. A gear pair evaluation apparatus comprising: coordinate converting means for associating, at a predetermined meshing rotational position, three-dimensional coordinate data on an orthogonal coordinate system measured at a set of measurement points on a tooth surface of a first gear with three-dimensional coordinate data on an orthogonal coordinate system measured at a set of measurement points on a tooth surface of a second gear that meshes with the first gear by using an assembly specification of the gear pair and converting the three-dimensional coordinate data into three-dimensional coordinate data on a cylindrical coordinate system based on the first gear; function generating means for generating a function representing the path of a point on a tooth surface of the second gear on the basis of the three dimensional coordinate data on a tooth surface of the second gear; inter-tooth-surface gap information calculating means for calculating, by using the function, relative angle information representing a gap between a point on a tooth surface of the first gear and a point on a tooth surface of the second gear that exists on the same circumference on which the point on the tooth surface of the first gear exists on the cylindrical coordinate system and corresponds to the point; and enveloping surface calculating means for extracting the smallest relative angle information from the relative angle information calculated at each meshing rotational position at which the first and second gears mesh with each other and calculating a three-dimensional enveloping surface representing a relative gap distance between a tooth surface of the first gear and a tooth surface of the second gear from the start of meshing between the first and second gears to the end of the meshing with respect to the extracted minimum relative angle information on the basis of the relative angle information.