Li Tao, Dai Ming, Lin Jing, Zhang Yue, Zhang Zhimin
THE TORQUE STANDARD MACHINES IN CHINA
This paper describes the development of torque standard machines in China, its measurement range and its measurement uncertainty information etc. Also, the situation of torque standard machines which are in building process or will be built in the future is described in this document. In 1970's, the first standard machine for measuring torques was developed in Shanghai and it initiated the history of torque measurement in China. In the whole development process, there appeared four types of machines, which are:
a) the rolling bearing type,
b) the knife-edge type,
c) the air-bearing type and
d) the flexible supporting type. Nowadays, the torque standard machines in China are developing to the direction of large torque, super-large torque, small torque and mini torque ranges, and they are stepping into the international level rank.