| 摘要 |
A power transmission device which includes trunnion and bearing sets for transferring power from a power generating unit to an operating unit. In the preferred embodiment of the invention, a cross (36) is provided with a plurality of trunnions (39, 41, 43, 45) which define transfer surfaces (38, 40, 42, 44). A bearing member in the form of a cup (86) is provided for each of the transfer surfaces (38, 40, 42, 44). The bearing cup (86) is defined by a plurality of internal bearing surfaces (94) which are integral with the bearing cup sidewall (88) and which contact the transfer surfaces (38, 40, 42, 44) of the cross (36). The bearing surfaces (94), in the preferred embodiment, are semi-circular in cross-section and make bearing contact with the essentially cylindrical transfer surface of the cross. The bearing cup (86) is preferably fabricated using powder metallurgy techniques which advantageously form the integral bearing surfaces within the cup, thereby eliminating the necessity for the use of balls or needles in the cup. |
