To provide a fixed-type constant-velocity universal joint that inexpensively materializes excellent durability and excellent performance under high-load conditions, low-load conditions and high-angle conditions.
The fixed-type constant-velocity universal joint has lubricating grease sealed inside the joint. The surface roughness Ra of a ball 37 is set to be 0.15 μm or less, while the surface roughness of the other surface against which the ball rolls is rougher than the surface roughness of the ball 37. An additive composition of the lubricating grease comprises a base oil, a diurea compound, molybdenum dithiocarbamate, a zinc dialkyldithiophosphate, melamine cyanurate, molybdenum disulfide and a calcium salt of an alkyl aromatic sulfonic acid.
SONE KEISUKE
OBARA MIKA
Tsuyoshi Kumano