| abstract |
A fixed type constant velocity universal joint capable of realizing characteristics excellent in durability, high load condition, low load condition, and high angle condition performance at low cost is proposed. A fixed type constant velocity universal joint in which lubricating grease is sealed inside the joint. The surface roughness of the ball 37 is set to Ra 0.15 μm or less, and the surface roughness of the counterpart surface on which the ball rolls is made rougher than the surface roughness of the ball 37. The additive composition of the lubricating grease includes base oil, diurea compound, molybdenum dithiocarbamate, zinc dialkyldithiophosphate, melamine cyanurate, molybdenum disulfide, and calcium salt of alkyl aromatic sulfonic acid. [Selection] Figure 1 |