Drive head for drilling unit - involves pinion rotated by drive motor acting on drive gearwheel via two free-running intermediate gearwheels, with drill connected to drive gearwheel

摘要

The intermediate gearwheels (14,16) have a larger dia. than the pinion (12), and which corresponds approximately to the average of the dia. of the pinion and the dia. of the drive gearwheel (18), pref. approximately 65% of this average value. It is also possible for the intermediate gearwheels to have the same dia. as the pinion. The distance of the intermediate gearwheels in relation to the drive gearwheel is adjustable both in a peripheral direction and also radially. USE/ADVANTAGE - To obtain a satisfactory torque transmission from a drive head to a drilling unit.