TAILIEUCHUNG - Illustrated Sourcebook of Mechanical Components Part 2

Tham khảo tài liệu 'illustrated sourcebook of mechanical components part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 1-54 6 Ways to Prevent Overloading These safety valves give way if machinery jams thus preventing serious damage. Peter c. Noy 2 FRICTION CLUTCH. Adjustable spring tension that holds the two friction surfaces together sets overload limit. As soon as overload Is removed the clutch reengages. One drawback is that a slipping clutch can destroy itself if unnoticed. Ỉ SHEAR PIN is simple to design and reliable in service. However after an overload replacing the pin takes a relatively long time and new pins aren t always available. 3 MECHANICAL KEYS. Spring holds ball in dimple In opposite face until overload forces the ball out. Once slip begins wear Is rapid BO device is poor when overload is common. Gears Gearing 1-55 4 RETRACTING KEY. Ramped sides of keyway force key outward against adjust-abe spring. As key moves outward a rubber pad or another spring forces the key into a slot in the sheave. This holds the key out of engagement and prevents wear. To reset push key out of slot by using hole in sheave. 5 ANGLE-CUT CYLINDER. With just one tooth this is a simplified version of the jaw clutch. Spring tension sets load limit. 6 DISENGAGING GEARS. Axial forces of spring and driving arm balance. Overload overcomes spring force to slide gears out of engagement. Gears can strip once overloading is removed unless a stop holds gears out of engagement. 1-56 Torque-Limiters Protect Light-Duty Drives In such drives the light parts break easily when overloaded. These eight devices disconnect them from dangerous torque surges. L. Kasper 1 MAGNETS transmit torque according to their number and size. In-place control is limited to lowering torque capacity by removing magnets. 2 CONE CLUTCH is formed by mating taper on shaft to beveled hole through gear. Tightening down on nut increases torque capacity. 3 RING fights natural tendency of rollers to jump out of grooves cut in reduced end of one shaft. Slotted end of hollow shaft is like a .

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