Abstract: A lubricating mechanism for a planetary gear train, including a planetary gear, a sliding bearing, a planetary gear shaft, and a thrust bearing. The planetary gear is supported by the sliding bearing. The thrust bearing is arranged at an end surface of the planetary gear. A gap is formed between the thrust bearing and the end surface. The thrust bearing is provided with convex rings facing the end surface and being arranged at intervals in a radial direction. The end surface facing the thrust bearing is provided with grooves corresponding to the convex rings on a one-to-one basis, each groove being configured to accommodate a corresponding convex ring. An axial and radial clearance are formed between an outer surface of each convex ring and an inner surface of the groove opposite the corresponding convex ring. The axial and radial clearance are in communication with the gap.

Abstract: A lubricating mechanism for a planetary gear train, including a planetary gear, a sliding bearing, a planetary gear shaft, and a thrust bearing. The planetary gear is supported by the sliding bearing. The thrust bearing is arranged at an end surface of the planetary gear. A gap is formed between the thrust bearing and the end surface. The thrust bearing is provided with convex rings facing the end surface and being arranged at intervals in a radial direction. The end surface facing the thrust bearing is provided with grooves corresponding to the convex rings on a one-to-one basis, each groove being configured to accommodate a corresponding convex ring. An axial and radial clearance are formed between an outer surface of each convex ring and an inner surface of the groove opposite the corresponding convex ring. The axial and radial clearance are in communication with the gap.

Abstract: A lubricating mechanism for a planetary gear train, including a planetary gear, a sliding bearing, a planetary gear shaft, and a thrust bearing. The thrust bearing is arranged at an end surface of the planetary gear. A gap is formed between the thrust bearing and end surface. An axial and radial channel are formed in the thrust bearing in a lubricating position in a circumferential direction. The thrust bearing includes a groove facing the end surface. A seal is provided in the groove. One end of the axial channel is in communication with the gap, the other end being in communication with the radial channel and being an open end leading to an outside of the planetary gear train. The axial channel is closer to the sliding bearing than the groove in a radial direction. The seal is configured to prevent lubricating oil from being discharged from the gap.

Abstract: A lubricating mechanism for a planetary gear train, including a planetary gear, a sliding bearing, a planetary gear shaft, and a thrust bearing. The thrust bearing is arranged at an end surface of the planetary gear. A gap is formed between the thrust bearing and end surface. An axial and radial channel are formed in the thrust bearing in a lubricating position in a circumferential direction. The thrust bearing includes a groove facing the end surface. A seal is provided in the groove. One end of the axial channel is in communication with the gap, the other end being in communication with the radial channel and being an open end leading to an outside of the planetary gear train. The axial channel is closer to the sliding bearing than the groove in a radial direction. The seal is configured to prevent lubricating oil from being discharged from the gap.