What is a gear? Its structure and function?
Tooth line. Intersection of tooth surface and dividing cylinder surface. Gear material and heat treatment have great influence on its carrying capacity, size and weight. After 1970s, surface hardened steel is widely used. Gears are widely used and have many kinds. According to the tooth profile curve can be divided into involute gear, cycloid gear, arc gear and so on. According to the shape can be divided into cylindrical gears, bevel gear and non-circular gear, rack, worm and worm wheel; in the tooth's surface can be divided into external gear and internal gear; tooth shape can be divided into straight gear, helical gear, herringbone gear, gear curve etc.. The manufacturing method can be divided into casting gears, cutting gears, rolling gears, sintered gears, etc..
The tooth thickness. The arc length between the two flanks of one tooth on the end face is long. To pitch (pitch). The length of the graduated circle between the two adjacent teeth. The modulus. Pitch and PI ratio in millimeters. Pitch. The reciprocal of an modulus, in inches. Addendum. The radial distance between the addendum circle and the dividing circle. Dedendum. The radial distance between the circle and the root circle. Full tooth height. The radial distance between the addendum circle and the root circle. Facewidth. The axial dimension of the gear teeth. Transverse pressure angle. The radial line between the tooth profile and the dividing circle and the sharp angle of the tangent of the tooth profile of the point.
Name of each part of gearThe main terms used in gears are: gear teeth. Each of the raised parts used for meshing is called the number of teeth. Alveolar (interdental). The space between two adjacent teeth. Addendum circle. The circle at the top of all teeth. Root circle. The circle across the bottom of all the teeth. Dividing circle. Reference circle for calculating gear geometry. The tooth surface. The surface of the gear teeth is between the cylindrical surface of the tooth crown and the cylindrical surface of the root of the tooth. The tooth profile. The tooth surface by a specified cut line
Gear:A mechanical part that has teeth that can mesh with one another. For more than 300 B. C. Aristotle, Greece, expounded the problem of rotating motion in bronze or iron gear in the mechanical problem. In 235 ad, Ma Jun of China used a complete set of gear trains in the guide car they created. In 1674, O. Romer of Denmark proposed the use of cycloid as a profile curve. In 1765, L. Euler of Switzerland suggested using involute as profile curve. In 1899, the first implementation of the O. lasche x-gear scheme. In 1923 the United States E. Wilde Harper proposed circular arc tooth profile gear, the Soviet Union in 1955 M.A. he of circular arc gear is studied and its application in production.
