maszyny: Gear

Evidence: 100 • authority: 72

A gear or gearwheel, also called a toothed wheel, or cog is a rotating machine part typically used to transmit rotational motion or torque by means of a series of "teeth" that engage with compatible teeth of another gear or other part. The teeth can be integral saliences or cavities machined on the part, or separate pegs inserted into it. In the latter case, the gear is usually called a cogwheel. A cog may be one of those pegs or the whole gear. Two or more meshing gears are called a gear train. The smaller member of a pair of meshing gears is often called pinion. Most commonly, gears and gear trains can be used to trade torque for rotational speed between two axles or other rotating parts…

Evidence: 49 • authority: 72

A fixed-gear bicycle or fixie is a bicycle that has a drivetrain with no freewheel mechanism, meaning the pedals always spin together with the rear wheel. The freewheel was developed early in the history of bicycle design but the fixed-gear bicycle remained the standard track racing design. More recently the "fixie" has become an international subculture mainly among urban cyclists. Most bicycle hubs incorporate a freewheel to allow the pedals to remain stationary while the bicycle is in motion, so that the rider can coast, i.e., ride without pedalling using forward momentum. A fixed-gear drivetrain has the drive sprocket (or cog) threaded or bolted directly to the hub of the back wheel, so…

Evidence: 49 • authority: 72

Evidence: 44 • authority: 72

Evidence: 39 • authority: 72

The Antikythera mechanism ( AN-tik-ih-THEER-ə, US also AN-ty-kih-) is an ancient Greek hand-powered orrery (model of the Solar System) built in the 2nd century BC and discovered in 1901. It is the oldest known example of an analogue computer. It could be used to predict astronomical positions and eclipses decades in advance. It could also be used to track the four-year cycle of athletic games similar to an olympiad, the cycle of the ancient Olympic Games. The artefact was among wreckage retrieved from a shipwreck off the coast of the Greek island Antikythera in 1901. In 1902, during a visit to the National Archaeological Museum in Athens, it was noticed by Greek politician Spyridon Stais as…

Evidence: 39 • authority: 72

A rack railway (also rack-and-pinion railway, cog railway, or cogwheel railway) is a steep grade railway with a toothed rack rail, usually between the running rails. The trains are fitted with one or more cog wheels or pinions that mesh with this rack rail. This allows the trains to operate on steep gradients of 100% (45 degrees) or more, well above the 10% (5.7 degrees) maximum for friction-based rail. The rack-and-pinion mechanism also provides more controlled braking and reduces the effects of snow or ice on the rails. Most rack railways are mountain railways, although a few are transit railways or tramways built to overcome a steep gradient in an urban environment. The first cog railway…

Evidence: 39 • authority: 92

Evidence: 34 • authority: 88

Cog wheel. Abstract The cog wheel was part of complex tools and machines in antiquity and primarily served for the transmission of energy.

Evidence: 34 • authority: 88

Construction of cylindrical toothed gear with a corrected teeth in Inventor. Generator of a cylindrical toothed gear. The article presented the process of construction of a corrected cylindrical gear with straight teeth. The operation of the gear generator is discussed. The procedure of gear engagement correction based on P0 type correction was indicated. Preliminary calculations were made using analytical methods. The work of the generator of gear components was analyzed. Calculation module errors are indicated.

Evidence: 34 • authority: 88

Evidence: 34 • authority: 80

Probability estimate of the strength reliability of toothed wheel gear

Evidence: 34 • authority: 72