Thermally expanding drive shaft for cutting rod, has inner and outer partition rings made up of multiple alloys with low thermal expansion coefficient, tightly contacting with corresponding sides of annular seats of bearings

摘要

The inner and outer partition rings (31,32) made of multiple alloys with low thermal expansion coefficients, are tightly contacting the corresponding side of annular seats (211,212) of the bearings (21). The rings are placed in a main housing (40).