Torque limiter for electric tool - with friction surfaces having recesses for lubricant and swarf

摘要

The drive gear (5) on the tool shaft (1) is coupled to the shaft by friction clutches comprising friction plates (7, 8, 10) which are pressed to each side of the gear wheel. One of the plates (10) rotates with the gear wheel and the other two plates rotate with the shaft. The friction plates have recesses which break up the friction surfaces and which locate lubricant. The recesses are simple holes, slots or grooves. They can have a variety of shapes and collect any swarf etc. loosened from the friction surfaces, preventing a grinding action. ADVANTAGE - Improved life friction clutches, accurate torque limitting.