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Gears are essential when driving motors and machines; they increase the output torque and adjust the direction and speed of rotation. They are primarily used to transmit rotational motion, but with the right gears and flat-toothed components, they can convert reciprocating motion to rotational motion and vice versa. Then the indispensable car is the Automobile Tooth Gear.
The life of automobile tooth gears is mainly assessed by two indicators, one is the contact fatigue strength of the gears, and the other is the bending fatigue strength of the gears. The former is mainly determined by the quality of carburizing and quenching, and the latter is mainly determined by the gear material.
1. Tooth surface wear
For open-gear transmission or closed-gear transmission containing unclean lubricating oil, due to the relative sliding between the meshing tooth surfaces, some hard abrasive particles enter the friction surface, thus changing the tooth profile and increasing the backlash. So that the gear is excessively thinned and the teeth are broken.
2. Tooth surface gluing
For high-speed and heavy-load gear transmission, due to the large friction between the tooth surfaces and the high relative speed, the temperature of the meshing area is too high. Once the lubrication conditions are poor, the oil film between the tooth surfaces will disappear, making the metal of the two gear teeth. The surfaces are in direct contact so mutual bonding occurs.
3. Fatigue pitting
The gears do periodic motion, so the contact stress changes according to the pulsating cycle. Under the action of this alternating contact stress on the tooth surface for a long time, small cracks will appear at the tool marks of the tooth surface. With the passage of time, the cracks gradually expand laterally on the surface. The surface of the tooth produces a small area of spalling and some fatigue craters are formed.
4. Broken gear teeth
Gears under load in operation engineering are like cantilever beams. When the periodic stress of pulses at the root exceeds the fatigue limit of the gear material, cracks will occur at the root and gradually expand. When the remaining part cannot bear the transmission load, it will occur. Broken teeth. Gears may also break teeth due to severe impact, eccentric load, and uneven material during work.
5. Plastic deformation of tooth surface
Under impact load or heavy load, the tooth surface is prone to local plastic deformation, so the curved surface of the involute tooth profile is deformed.
