Criteria for the design of Gear Drive

    Gear failure for the five forms, should be the appropriate design criteria established. But for the tooth wear, plastic deformation, the calculation method has not yet established a wide and effective use of engineering and design data, so the design of gear, it is usually only on the guarantee of tooth root bending fatigue strength and ensure the gear surface contact fatigue strength calculation of the two criteria.
    For gear transmission of high power (such as the main transmission, aero engine turbine drive), also calculated according to ensure the tooth scuffing criterion (see GB6413 1986). As for the ability to resist other failure, although generally not calculated, but the measures to be taken, to strengthen the tooth's ability to resist these failures.
    1.Closed gear transmission
    By the practice that, gear in the closed, usually to ensure that the contact fatigue strength of tooth surface. But for tooth surface hardness, high strength and low core tooth gear (such as 20, 20Cr steel after carburizing and quenching gear) gear or a more brittle material, usually in order to ensure the tooth root bending fatigue strength.
    If two gears are hardened and the tooth surface hardness as high as, depending on the specific circumstances.
The large power transmission, such as input power exceeds the gear 75kW, heat, easy to lead to bad lubrication and gear tooth scuffing damage and so on, in order to control the temperature rise, still should make cooling capacity calculation.

Spur Gears

    2.Open gear transmission
    Open (semi open) gear transmission, sed to ensure the tooth surface abrasion resistance and anti fracture ability dedendum two criteria are calculated, but as mentioned earlier, the ability of anti abrasion on the calculation method of tooth surface is not perfect yet, so the open (semi open) gear drive, only to ensure that the tooth root bending fatigue strength as design criteria. In order to extend the open (semi open) the life of gear, according to the actual need and the modulus of the appropriate increase of the.
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