Hualian gear, this paper describes the classification of gear
Gear tooth shape, can press gear tooth shape, line shape, gear in the surface and manufacturing methods such as classified.
The gear tooth shape including tooth profile curve, the pressure Angle, tooth high and modification. Involute gear are easier to make, so the use of modern gear, the absolute majority of involute gear, and cycloid gear and circular arc gear application is less.
In the pressure Angle, little pressure Angle gear of the bearing capacity of small; And the big pressure Angle gear, although carrying capacity is higher, but in the transmission torque under the same bearing load increase, so only for special circumstances. And the high gear tooth has standardization, generally all use standard high gear. The advantages of the gear shift more, has already spread in various mechanical equipment.
In addition, gear but also may according to the its appearance is divided into cylindrical gears, bevel gear, non-circular gears, rack, worm and worm gear; According to the tooth line shapes into gear, straight helical gear, gear, gear word curve; According to the surface of the gear is divided into gear in the gears; By the way of making can be divided into casting gear, gear, gear cutting system rolling, sintering gear, etc.
Gear manufacturing material and heat treatment process on the gear the bearing capacity and size weight has very big effect. Before the 1950 s, gear multi-purpose carbon steel, alloy steel to switch to the 60 s, 70 s and multi-purpose surface hardening steel. According to the hardness, tooth face a distinction is soft and hard tooth surface tooth face two kinds.
The soft tooth gear carrying capacity is low, but manufacturing is relatively easy, run close the gender is good, more for transmission size and weight without strict limits, and the production of small general mechanical. Because the pairing of gear, small wheels burden is heavy, so for the working life of the size of the gear roughly equal, small gear surface hardness in general to high than the big wheel.
Hard surface gears of the bearing capacity of high, it is in the gear after fine cut, and then to hardening, hardening or carburizing quenching process, in order to improve the hardness. But in the heat treatment, gear inevitably cause deformation, so in heat treatment after grinding, polishing or shall be fine cut, to eliminate the error because of deformation and improve the precision of the gear.
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