2024 Volume 59 Issue 11 Pages 539-550
When torque characteristics of a grease-lubricated small ball bearing, 608, were experimentally checked, the results showed that even bearings from the same manufacturer had large variations in torque, and that the torque did not converge even after 24 hours at low rotational speed. However, after the experiment, the internal grease was washed away, and the torque was measured using the same bearing with a small amount of oil for lubrication, the torque was low and no variations or fluctuations were not observed. The reason why there were torque variations, even though the amount of grease sealed was almost the same, was thought to be due to the state of grease filling. Therefore, in this study, torque in a small ball bearing 6204, was measured with different state of grease filling using a device that can fill a fixed amount of grease into a targeted position. Then, the effect of the initial state of grease filling to the torque was clarified.
