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39 relations: Agostino Ramelli, Almagest, Angular velocity, Antikythera mechanism, Apsidal precession, Automatic transmission, Bevel gear, Bookwheel, Clockwise, Coaxial, Continuously variable transmission, Cycloidal drive, Deferent and epicycle, Differential (mechanical device), Epicycloid, Epitrochoid, Ford Model T, Gear, Gear train, Harmonic drive, Herringbone gear, Hub gear, Hypocycloid, List of gear nomenclature, NuVinci Continuously Variable Transmission, Orbit of the Moon, Pencil sharpener, Pratt & Whitney Canada PT6, Ptolemy, Radar, Ravigneaux planetary gearset, Richard of Wallingford, Rohloff Speedhub, Simpson planetary gearset, Sturmey-Archer, Tractor, Transmission (mechanics), World War II, 3D printing.
Agostino Ramelli
Agostino Ramelli (1531–ca. 1610) was an Italian engineer best known for writing and illustrating the book of engineering designs Le diverse et artificiose machine del Capitano Agostino Ramelli, which contains, among others, his design for the bookwheel.
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Almagest
The Almagest is a 2nd-century Greek-language mathematical and astronomical treatise on the apparent motions of the stars and planetary paths, written by Claudius Ptolemy. One of the most influential scientific texts of all time, its geocentric model was accepted for more than 1200 years from its origin in Hellenistic Alexandria, in the medieval Byzantine and Islamic worlds, and in Western Europe through the Middle Ages and early Renaissance until Copernicus.
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Angular velocity
In physics, the angular velocity of a particle is the rate at which it rotates around a chosen center point: that is, the time rate of change of its angular displacement relative to the origin.
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Antikythera mechanism
The Antikythera mechanism is an ancient Greek analogue computer and orrery used to predict astronomical positions and eclipses for calendar and astrological purposes decades in advance.
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Apsidal precession
In celestial mechanics, apsidal precession or orbital precession is the precession (rotation) of the orbit of a celestial body.
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Automatic transmission
An automatic transmission, also called auto, self-shifting transmission, n-speed automatic (where n is its number of forward gear ratios), or AT, is a type of motor vehicle transmission that can automatically change gear ratios as the vehicle moves, freeing the driver from having to shift gears manually.
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Bevel gear
Bevel gears are gears where the axes of the two shafts intersect and the tooth-bearing faces of the gears themselves are conically shaped.
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Bookwheel
The bookwheel (also written book wheel and sometimes called a reading wheel) is a type of rotating bookcase designed to allow one person to read a variety of heavy books in one location with ease.
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Clockwise
Two-dimensional rotation can occur in two possible directions.
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Coaxial
In geometry, coaxial means that two or more three-dimensional linear forms share a common axis.
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Continuously variable transmission
A continuously variable transmission (CVT), also known as a single-speed transmission, stepless transmission, pulley transmission, or, in case of motorcycles, a twist-and-go, is an automatic transmission that can change seamlessly through a continuous range of effective gear ratios.
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Cycloidal drive
A cycloidal drive or cycloidal speed reducer is a mechanism for reducing the speed of an input shaft by a certain ratio.
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Deferent and epicycle
In the Hipparchian and Ptolemaic systems of astronomy, the epicycle (from ἐπίκυκλος, literally upon the circle, meaning circle moving on another circle) was a geometric model used to explain the variations in speed and direction of the apparent motion of the Moon, Sun, and planets.
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Differential (mechanical device)
A differential is a gear train with three shafts that has the property that the rotational speed of one shaft is the average of the speeds of the others, or a fixed multiple of that average.
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Epicycloid
In geometry, an epicycloid or hypercycloid is a plane curve produced by tracing the path of a chosen point on the circumference of a circle—called an epicycle—which rolls without slipping around a fixed circle.
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Epitrochoid
An epitrochoid is a roulette traced by a point attached to a circle of radius r rolling around the outside of a fixed circle of radius R, where the point is at a distance d from the center of the exterior circle.
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Ford Model T
The Ford Model T (colloquially known as the Tin Lizzie, Leaping Lena, or flivver) is an automobile produced by Ford Motor Company from October 1, 1908, to May 26, 1927.
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Gear
A gear or cogwheel is a rotating machine part having cut like teeth, or cogs, which mesh with another toothed part to transmit torque.
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Gear train
A gear train is a mechanical system formed by mounting gears on a frame so the teeth of the gears engage.
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Harmonic drive
Harmonic Drive is the brand name of strain wave gear trademarked by the Harmonic Drive company, and invented in 1957 by C.W. Musser.
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Herringbone gear
A herringbone gear, a specific type of double helical gear, is a special type of gear that is a side to side (not face to face) combination of two helical gears of opposite hands.
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Hub gear
A hub gear, internal-gear hub, or just gear hub is a gear ratio changing system commonly used on bicycles that is implemented with planetary or epicyclic gears.
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Hypocycloid
In geometry, a hypocycloid is a special plane curve generated by the trace of a fixed point on a small circle that rolls within a larger circle.
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List of gear nomenclature
The addendum is the height by which a tooth of a gear projects beyond (outside for external, or inside for internal) the standard pitch circle or pitch line; also, the radial distance between the pitch diameter and the outside diameter.
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NuVinci Continuously Variable Transmission
The NuVinci Continuously Variable Planetary Transmission is a type of roller-based continuously variable transmission (CVT) manufactured and marketed by the American company Fallbrook Technologies Inc.
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Orbit of the Moon
The Moon orbits Earth in the prograde direction and completes one revolution relative to the stars in about 27.322 days (a sidereal month) and one revolution relative to the Sun in about 29.530 days (a synodic month).
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Pencil sharpener
A pencil sharpener (also referred to in Ireland as a parer or topper) is a device for sharpening a pencil's writing point by shaving away its worn surface.
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Pratt & Whitney Canada PT6
The Pratt & Whitney Canada PT6, produced by Pratt & Whitney Canada, is a turboprop aircraft engine.
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Ptolemy
Claudius Ptolemy (Κλαύδιος Πτολεμαῖος, Klaúdios Ptolemaîos; Claudius Ptolemaeus) was a Greco-Roman mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology.
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Radar
Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.
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Ravigneaux planetary gearset
The Ravigneaux gearset is a double planetary gear set, invented by Pol Ravigneaux, who filed a patent application on July 28, 1949, in Neuilly-sur-Seine France.
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Richard of Wallingford
Richard of Wallingford (1292–1336) was an English mathematician, astronomer, horologist, and cleric who made major contributions to astronomy and horology while serving as abbot of St Albans Abbey in Hertfordshire.
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Rohloff Speedhub
The Rohloff Speedhub is an epicyclic internal hub gear for bicycles, developed and patented by Rohloff AG.
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Simpson planetary gearset
The Simpson planetary gearset consists of two planetary gearsets, both having the same gears and gear ratios.
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Sturmey-Archer
Sturmey-Archer is a manufacturing company originally from Nottingham, England.
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Tractor
A tractor is an engineering vehicle specifically designed to deliver at a high tractive effort (or torque) at slow speeds, for the purposes of hauling a trailer or machinery used in agriculture or construction.
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Transmission (mechanics)
A transmission is a machine in a power transmission system, which provides controlled application of the power.
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World War II
World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although conflicts reflecting the ideological clash between what would become the Allied and Axis blocs began earlier.
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3D printing
3D printing is any of various processes in which material is joined or solidified under computer control to create a three-dimensional object, with material being added together (such as liquid molecules or powder grains being fused together).
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References
[1] https://en.wikipedia.org/wiki/Epicyclic_gearing
