| abstract |
Provided is a constant velocity joint for a drive shaft which can be used with a good service life, without the addition of organic lead, having a high effect of suppressing the temperature rise of the grease during high speed rotation and which can avoid the deterioration of fat. It is a cross-groove type constant velocity joint in which the PCD clearance is negative and in which a preload is applied, or any other constant velocity joint for a drive shaft in which a grease containing, as essential components, the components (a), (b) and (g) or (a) to (g) following, is sealed: (a) base oil; (b) diurea type thickener according to the following formula: R1 NH-CO-NH-C6 H4 -p-CH2 -C6 H4 -p- NH-CO-NHR2 (in which R1 and R2 are identical aryl or cyclohexyl groups or different ones having a carbon number of 6 or 7). |