Patent ID: 8574083
Filing Date: 2013-11-05
Classification: F03D,F16D,F16H,Y02E,Y10T

Abstract:
1. A power transmission device which transmits power between a first member and a second member, comprising: a first shaft and a second shaft disposed on a power transmission path of the power transmission device, wherein the first member has a hollow portion, the hollow portion penetrating the first member axially, wherein one end part of the hollow portion of the first member and one end part of the second member are fitted to each other by interference fitting by setting the external diameter of the one end part of the second member so as to have a slightly larger size than the internal diameter of the one end part of the hollow portion of the first member, the other end part of the second member is connected to the first shaft, the second shaft is fitted to the other end part of the hollow portion of the first member so as the first member and the second shaft are connected to each other, and wherein the surface of at least one of an inner periphery of the hollow portion of the first member and an outer periphery of the second member is subjected to a surface treatment in which slipping occurs when an excessive torque exceeding a predetermined value is applied, and the slipping stops and the original torque transmission to be performed in the power transmission device is performed again between the first member and the second member when the excessive torque is eliminated, wherein the power transmission device comprises a first reduction mechanism and a second reduction mechanism, and wherein the first reduction mechanism comprises the first shaft, and the second reduction mechanism comprises the second shaft.