gears are one of mans oldest mechanical devices. the gear has been a basic element of machinery throughout all time from the earliest beginnings of machinery.how to choose a supplier?if your quantity is small, you can go to a local wholesaler, but if you want to order more, go directly to a factory will be more cost-effective. ningbo zhongyi hydraulic motor co., ltd will can provide superior-quality pg电子下载-pg电子游戏 , piston motor, hydraulic winch,axial piston motor products and satisfactory service. the earliest known relic of gearing from ancient times is the south pointing chariot (about 2600 bc) a miniature replica of this chariot is on exhibit at the smithsonian institute.
in view of the intricacy of the south pointing chariot, it seems obvious that there must have been earlier use of gearing going back to at least 3000 bc. the earliest written records about gearing are dated from about 330 bc in the writings of aristotle. he explained gear wheel drives in windlasses, pointed out that the direction of rotation is reversed when one gear wheel drives another gear wheel. from many writings it seems probable that both the egyptians and babylonians were using gear devices as far back as 1000 bc. the most probable uses were in clocks, temple devices and water lifting equipment. about 250 bc ctesibius wrote about making water clocks and water organs using gears. about 230 bc phylo of byzantium made rack and pinion device to raise water, but archimedes about 220 bc. made devices to multiply force or torque many times. by 100 bc the gear art included both metal and wooden gears.
triangular teeth, buttressed teeth, and pin teeth were all in use. spur gears, racks and pinions and worm gears had all arrived on the scene. right-angle pin-tooth drives were in use and perhaps the first primitive bevel gear. the romans and greeks made wide use of gearing in clocks and astronomical devices. gears were also used to measure distance or speed. one of the most interesting relics of antiquity is the antikythera machine which is an astronomical computer. it had many gears in it - some of which were planetary.
timeline of modern history of gearing:
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