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Criteria for the design of gear
Gear failure for the five forms, should be the appropriate design criteria established. However, tooth wear, plastic deformation and so on, has not yet been established because of the wide and effective use of engineering calculation methods and design data, so the current design of gear, it is usually only on the guarantee that the tooth root bending fatigue strength and tooth surface to ensure contact fatigue strength calculation of the two criteria. For high-power high-speed gear transmission (such as aero-engine main drive, drive turbine-generator unit, etc.), but also by the tooth surface to ensure that the criteria for anti-bonding capacity is calculated (refer to GB6413-1986). As for the ability to resist other failure, although generally not at present be calculated, but the measures to be taken to strengthen the tooth's ability to resist these failures.
1, closed gear transmission.
From the practic辣'文-论"文~网http://www.751com.cn e of that gear in the closed, usually to ensure that the main tooth contact fatigue strength. Tooth surface hardness for high strength and low core-tooth gear (20,20 Cr steel such as used by the quenching of carburized gears) or a more brittle material of the gear, usually at the tooth root bending fatigue strength to ensure that the main. If the two gears are hardened and the tooth surface hardness as high as, then as the case may be.
closed for more than gear, heat, easy to bad lubrication and cause injury, such as tooth bonding, in order to control the temperature rise, but also for calculation of cooling capacity.
2, open (semi-open) Gear
According to tooth surface is supposed to be based to ensure that anti-wear and anti-fracture ability Dedendum two criteria are calculated, but as mentioned earlier, on the tooth surface abrasion resistance of the method of calculating capacity is not perfect yet, so off-type (semi-open) Gear At present, only the tooth root bending fatigue strength to ensure that the design criteria. In order to extend the open (semi-open) the life of gear, and will be visible by the specific needs of the module to achieve an appropriate increase.
Before the reference of the gear wheels, spokes, wheels and other parts of the size, usually only for the structural design, strength calculation is not carried out. 译文：
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