The driving teeth of a excavator are not made of a tooth block, but a whole wheel. The driving teeth of a bulldozer are made of a tooth block. In fact, there is no difference between the three teeth and the two teeth, but the need for a few three teeth to match a few two teeth because of the diameter and the circumference of the bulldozer.
Driving wheel introduction
Driving wheel, power transmission of construction machinery excavator and bulldozer, in excavator, because the whole is foundry, so called "drive wheel", bulldozer is divided several pieces or forged, so it is called "drive gear". The driving wheel is directly connected with the drive motor, and directly transfers the power to the crawler, thus driving the entire chassis forward.
The main material of the driving wheel is mainly casting, but the driving gear of the high power bulldozer is forged more, and the product will bear the greater driving force so as to guarantee the quality of the product. No matter what kind of material, the product must pass through casting (forging), mechanical processing, tooth quenching and other processes, and ultimately to the customer.
The driving wheel of the excavator is mainly the casting product, the material is generally ZG40Mn, the hardening hardness of the tooth part is similar to the bulldozer, HCR46-56, because the wheel is the whole processing, so the process is relatively simple, so the machining precision and the dimension precision can be ensured.
The tooth block of the rotary drilling rig and the bulldozer is mainly forged, because it is a block of three teeth or two teeth, and the last one is to be spelled into one wheel, so it is more strict in the processing technology and technical requirements. Bulldozer tooth block requirements: the steel should meet the 40MnB or 35MnB alloy steel material specified in GB/T 3077, and other materials with mechanical properties not lower than the above brand. The carbon content of the steel for the tooth block should be in accordance with the regulations of GB/T 3077; the sulfur and phosphorus content should be less than 0.035%. The content of non-metallic inclusions, brittle inclusions and plastic inclusions in steel should be in accordance with the 2.5 level requirements stipulated in GB/T 10561 - 1989; the heat treatment hardness of the tooth block requires HCR46-56; the forging ratio of the tooth block should be greater than or equal to 2 and the slope of the die is 3 degree ~5; the tooth shape precision of the forging should be controlled in the range of + 0.7. Mm within.
Drive wheel wear:
The wear of the driving wheel teeth often occurs at the root, front and rear sides, the sides and the top of the gear teeth. When the bulldozer moves forward and the gear sets up the crawler pin, the wear occurs on the front side of the tooth; conversely, when the bulldozer runs back, the wear occurs on the rear side of the tooth. When the track is too loose, the track will be deflected, and the teeth will impact the side surfaces of the chain links.
Another wear form of the drive wheel tooth is wear on the top. Top wear occurs when the teeth of the tracked and driving wheels are filled with viscous material and the engagement relationship between the driving wheels and the tracked pin sleeve is changed. When bulldozers move forward, they mark the sides of the drive wheel's sides and the sides of the pins.