Ключевые слова: auto, automobile, automotive, background, box, car, chain, clutch, composition, crosssection, drive, engine, force, gear, gearbox, gearing, hard, industry, machine, machinery, machining, manual, mechanic, mechanical, metal, part, power, product, rotate, rotation, section, serrate, serrated, serration, service, spare, speed, spin, sprocket, steel, surface, technical, technology, timing chain, torque, transfer, transmission, vehicle, wheel, work,