Patent ID: 9002662
Filing Date: 2015-04-07
Classification: F16C,G01M

Abstract:
1. A system including a driver, a four point contact ball bearing assembly having rolling elements, and a device to calculate a rotational torque T 0 acting between inner and outer rings of the four point contact ball bearing assembly, comprising: a contact pressure calculation unit for calculating the contact pressure for each of the rolling elements; an individual torque calculation unit for calculating a rotational torque T for each of the rolling elements; a total sum calculation unit for calculating the sum of respective rotational torques T of all of the rolling elements to determine the resultant sum to be the rotational torque T a control unit to control the driver based on the calculated rotational torque T wherein the individual torque calculation unit includes an input section for inputting and storing in a storage region, a load (Fr(Fx, Fy), Fa, M(Mx, My)), acting on a bearing assembly, and a coefficient C determined for each of bearing assemblies; a contact pressure sum calculation section for calculating the contact pressure sum P a four point contact ratio calculation section for calculating a four point contact ratio C a contact ratio specific torque calculation section for calculating the rotational torque T according to the following equations, using the contact pressure total sum P