Producing method of bearing unit, producing method of machine, and producing method of vehicle

A bearing unit producing method comprising:

• a step of measuring torque of a first bearing unit under each of a plurality of load conditions during production of the first bearing unit;
• a step of determining a target value of each of a plurality of production parameters based on a load-torque relationship obtained from the measurement results of the torque;
• and
• a step of producing a second bearing unit based on the target value of each of the plurality of production parameters,
• wherein the measurement step includes measuring a plurality of parameter values relating to the plurality of production parameters during production of the first bearing unit, and
• wherein the determination step includes
• setting a reference level relating to certain production parameters selected from among the plurality of production parameters based on the measurement results of the torque and the measurement results of the plurality of parameter values, and
• determining a target value of each of the plurality of production parameters using the reference level,
• wherein the determination step further includes calculating an SN ratio based on measurement results of the torque, and
• wherein the certain production parameters are selected from among the plurality of production parameters based on calculation results of the SN ratio.