US 12,292,278 B2
Method, system, device and medium for measuring gear tooth profile roughness
Jiachun Lin, Beijing (CN); Xinyu Fan, Beijing (CN); Peng Wang, Beijing (CN); Yunfei Li, Beijing (CN); Baofeng He, Beijing (CN); and Zhaoyao Shi, Beijing (CN)
Assigned to BEIJING UNIVERSITY OF TECHNOLOGY, Beijing (CN)
Filed by BEIJING UNIVERSITY OF TECHNOLOGY, Beijing (CN)
Filed on Jun. 27, 2023, as Appl. No. 18/214,816.
Claims priority of application No. 202310492007.9 (CN), filed on May 5, 2023.
Prior Publication US 2024/0369342 A1, Nov. 7, 2024
Int. Cl. G01M 13/021 (2019.01); G01B 5/20 (2006.01)
CPC G01B 5/202 (2013.01) [G01M 13/021 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for measuring gear tooth profile roughness, comprising:
obtaining design parameters of a target gear pair and test parameters of each tooth profile working point when a driving gear and a driven gear in the target gear pair are meshed; the design parameters comprise a teeth number of the driving gear, a teeth number of the driven gear, a modulus, a modification coefficient of the driving gear, a modification coefficient of the driven gear and a pressure angle; the test parameters comprise torque of the driving gear, rotating speed of the driving gear and a center distance between the driving gear and the driven gear;
taking any one of gears in the target gear pair as a target gear, and measuring a tooth surface characteristic line of the target gear in a tooth profile direction to obtain a measured surface profile; the tooth surface characteristic line is a tooth profile line determined according to each tooth profile working point when the driving gear and the driven gear are meshed;
calculating the tooth surface characteristic line of the target gear in the tooth profile direction according to the design parameters to obtain a theoretical tooth profile curve;
fitting the measured surface profile and the theoretical tooth profile curve to obtain a surface structure curve;
calculating a Hertzian contact width of each tooth profile working point in a working area on the theoretical tooth profile curve according to the design parameters and the test parameters, and determining an evaluation length of surface roughness corresponding to each tooth profile working point according to the Hertzian contact width;
filtering the surface structure curve by means of a filter with a set wavelength to obtain a surface roughness profile; and
determining surface roughness parameters of each tooth profile working point in the working area according to the surface roughness profile for each evaluation length; the surface roughness parameters are configured for characterizing bearing capacity of the target gear in the working area.