A ball screw device includes: a screw shaft that has a first screw groove on an outer circumferential surface thereof; a cylindrical nut member that has a second screw groove on an inner circumferential surface thereof; plural rolling elements that can roll in a rolling path formed between the first screw groove and the second screw groove; and a lubricant applied to the rolling path, wherein the lubricant has a loss tangent tanδ larger than 0.11, which is measured by dynamic viscoelasticity measurement performed at a temperature of 25° C., an angular frequency of 10 rad/s, and an amount of strain of 0.01%.
BALL SCREW DEVICE, ELECTRIC POWER STEERING DEVICE, AND LUBRICANT FOR BALL SCREW DEVICE
2023-12-07
Patent
Electronic Resource
English
BALL SCREW DEVICE, AND STEERING DEVICE INCLUDING BALL SCREW DEVICE
European Patent Office | 2018
|BALL SCREW DEVICE AND STEERING DEVICE INCLUDING BALL SCREW DEVICE
European Patent Office | 2018
|