Understanding the mechanics of Power Screws: Applications, Mechanics, and Self-Locking Principles
Автор: Mechanical Engineering with Dr. Sanei
Загружено: 2024-12-09
Просмотров: 998
Описание:
Power screw
Used to transmit power through threads
Examples include vises, presses, jacks, lead screw on lathe
Self Locking:
If the lowering torque is negative, the load will lower itself by causing the screw to spin without any external effort. If the lowering torque is positive, the screw is self-locking.
Self-locking condition is pi*f* dm larger than the lead angle
Noting that l / p* dm = tan l, the self-locking condition can be seen to only involve the coefficient of friction and the lead angle.
Acme Threads:
If Acme threads are used instead of square threads, the thread angle creates a wedging action.
The friction components are increased.
The torque necessary to raise a load (or tighten a screw) is found by dividing the friction terms by cosa.
Повторяем попытку...
Доступные форматы для скачивания:
Скачать видео
-
Информация по загрузке:
