Torque limiting mechanism

摘要

A torque limiting mechanism for transmitting power of an external drive source to the drive shaft of a compressor. A coupler member is a spring frame that can be engaged with and disengaged from first and second engaging portions. When the spring frame is engaged with the engaging portions, power is transmitted from a pulley to a hub. When the load on the hub is equal to or greater than a predetermined level, the engaging state between the engaging portions and the spring frame changes such that power transmission is discontinued. Thereafter, part of the first and second engaging portions is destroyed such that the spring frame rotates relative to the engaging portions without interfering with the engaging portions.