Excavator Undercarriage Parts PC300 Sprocket For KOMATSU?>
Product origin :Quanzhou Fujian China
Delivery time :30days
Supply capacity :20000pcs
The sprocket is divided into a driving sprocket and a driven sprocket. The driving sprocket is mounted on the engine output shaft through a spline; the driven sprocket is mounted on the motorcycle driving wheel and transmits power to the driving wheel through the chain. Generally The driving sprocket is smaller than the driven sprocket, which can reduce the speed and increase the torque.
|Place of Production||Quanzhou Fujian China|
|Use||Excavator, Bulldozer, ect|
|Technology||Forging Casting/Smooth Finish|
|Color||Commonly use color, Customized|
When to replace the sprocket of an excavator
The drive teeth are sharpened and replaced as soon as possible, otherwise the service life of the chain will be affected and the drive will be cheap.
How to distinguish the guide wheel and sprocket of an excavator
The obvious differences are as follows:
1. The front wheel is the guide wheel, which is a toothless wheel.
2. The driving wheel is behind the guide wheel. It has a semi-circular iron plate. The outer side is round and the inner side has teeth.
Main forms of excavator sprocket damage
1. Broken tooth: When the tooth is under the action of bending stress, the root bending stress is the largest and there is stress concentration. Therefore, the tooth break often occurs at the root of the tooth. If the gear teeth work on one side, the bending stress changes according to the pulsating cycle; if the gear teeth work on both sides, the bending stress changes according to the symmetrical cycle. When the bending stress exceeds the bending endurance limit of the material, fatigue cracks will occur under repeated repeated loads, and crack growth will cause broken teeth. This fracture is called bending fatigue fracture.
Sprocket made of brittle materials such as hardened steel or cast iron, often causes sudden breakage of gear teeth when subjected to overload or impact.
2. Tooth surface pitting: When the gear tooth is working, the contact stress generated at any point on the working surface changes from zero to the maximum, that is, the tooth surface contact stress changes in a pulsating cycle. When the contact stress of the tooth surface exceeds the contact durability limit of the material, the surface layer of the tooth will have a slight fatigue crack under the repeated load. The crack development causes the metal particles to peel off and form fatigue pitting, which makes the sprocket meshing situation worse and is discarded. Practice has shown that fatigue pitting occurs first at the root surface near the pitch line. The pitting resistance of the tooth surface is mainly determined by the hardness of the tooth surface. The higher the hardness of the tooth surface, the stronger the resistance to pitting corrosion.
Tooth surface pitting generally occurs in closed sprocket drives with soft tooth surfaces (HB≤350), which often fails due to tooth surface pitting.
3. Tooth surface gluing: In high-speed, heavy-duty closed-type sprocket transmissions, lubrication failure often occurs due to the temperature rise in the meshing zone, causing the two sprocket tooth surfaces to directly contact the metal and stick to each other. When the two tooth surfaces slide relative to each other, the softer tooth surfaces are torn off in the sliding direction to form a glue groove.
Improving the hardness and smoothness of the tooth surface can enhance the anti-glue ability. Low-speed transmission sprocket uses lubricating oil with higher viscosity; while steel sprocket uses anti-gluing additive lubricating oil, the effect is better.
4. Tooth surface wear: There are usually two types of tooth surface wear: one is abrasive wear caused by the entry of dust, metal particles, etc .; the other is the running-in wear caused by the friction between the tooth surfaces. Abrasive wear is unavoidable in open sprocket drives. With closed sprocket drive. Improving the smoothness of the tooth surface and ensuring good lubrication can prevent or reduce wear.
5. Plastic deformation of tooth surface: Under the action of heavy load, the soft tooth surface may produce local plastic deformation, which will cause the tooth surface to lose the correct tooth shape. This damage is often encountered in low-speed, start-up and frequent overload transmissions.