The walking device of the crawler bulldozer is composed of a walking frame, a guide wheel, a crawler tensioning device, a supporting sprocket, a roller, a crawler assembly, and a driving wheel. The left and right crawlers are wrapped around the above four wheels and are tensioned. The device is tensioned and directly in contact with the ground. The driving wheels drive the crawler to rotate around the four types of wheels and do not roll directly on the ground. The guide wheel is to tension the track and guide it to wind correctly. Several rollers roll on the track surface of the track to transmit vertical loads to the track. The supporting sprocket supports the upper half of the track so that it does not sag, and can reduce its up and down vibration. The crawler bulldozer has a complicated structure, a large weight, a large motion inertia, and poor cushioning performance, resulting in serious wear of the "four-wheel one belt", high cost, and short life. Here are some common wear phenomena of the four-wheeled belt of crawler bulldozers.

　　Composition and function of crawler walking device

　　The crawler walking device of the bulldozer is composed of a walking frame, a guide wheel, a crawler tensioning device, a carrier sprocket, a roller, a crawler assembly, and a driving wheel. The left and right crawlers are wrapped around the above four wheels. The tightening device is tensioned and directly contacts the ground. The driving wheels drive the crawler to rotate around the four types of wheels and do not roll directly on the ground. The guide wheel tensions the track and guides it to wind correctly. Several rollers roll on the track surface of the track to transmit vertical loads to the track. The supporting sprocket supports the upper half of the track so that it does not sag, and can reduce its up and down vibration. The above four wheels and tensioning devices, except for the driving wheels, are assembled on a wheel frame (that is, a trolley frame, also called a track frame), thereby forming a trolley. Each tracked vehicle has two left and right trolleys. The weight of the whole vehicle is transmitted to the lower crawler through the trolley frame and rollers, so that the lower crawler is pressed firmly on the ground. When the driving wheel is driven by the final transmission gear (driven gear), the gear teeth pull the crawler, and the ground immediately produces a reaction force on the crawler, causing the carriage to move forward or backward relative to the ground, and the entire vehicle Follow it.

　　Common wear of "four wheels and one belt" of crawler bulldozers

　　The walking mechanism of the crawler bulldozer carries the full weight of the bulldozer and is responsible for the traveling function of the bulldozer. The main form of damage is wear. This form of damage is concentrated in the following contact parts: the outer surface of the drive wheel gear and the track pin sleeve, the guide wheel and the track surface of the track link, the track roller and the track track of the track link Surface, supporting sprocket and track link track surface, track pin and pin sleeve contact surface; track shoe and ground, etc.

　　Track wear

　　In the running mechanism of dry crawlers (compared to lubricated crawlers and sealed crawlers), the crawlers are not lubricated, which causes wear between the crawler pins and the pin sleeve due to relative movement during work. The wear between the pin and the pin sleeve in the crawler is inevitable and normal, but this wear will extend the pitch of the crawler and make the crawler too large. As this wear condition continues, the track will move sideways, causing wear on the guide wheels, rollers, carrier sprockets, drive gear teeth and other components, and it will also increase the wear on the track pins and sleeves. Track wear is also reflected in the reduction in the height of the track spurs due to the contact of the track shoes with the ground, and the track link caused by the contact of the track surface of the track link with the guide wheel, carrier chain wheel and roller The reduction in height will cause a loss of bulldozer traction when the track shoes are severely worn.

　　Drive wheel wear

　　The wear of the driving wheel gear teeth often occurs at the root of the gear teeth, the front and rear sides, the left and right sides, and the top of the gear teeth. When the bulldozer runs forward and the gear teeth lift up the track pin sleeve, the wear occurs on the front side of the gear teeth. Conversely, when the bulldozer travels backward, the wear occurs on the rear side of the gear teeth. When the track is too loose, track deflection will occur, and the gear teeth will impact the side of the chain rail joint, which will cause the wear of the side of the drive wheel gear. Another form of wear of the drive wheel teeth is top wear. Top wear occurs when the crawler and drive wheel teeth are filled with a viscous substance, and the meshing relationship between the drive wheel gear and the track pin sleeve is changed. When the bulldozer moves forward, it will scratch marks on the apex of the back of the tooth on the drive side of the drive wheel and the side of the pin sleeve.

　　Guide wheel wear

　　The wear of the guide wheel is caused by contact with the raceway surface of the chain link, and the wear of the protrusion width of the guide wheel body is caused by contact with the side of the chain link. The performance is as follows: the width of the protrusion of the guide wheel body is reduced, the diameter of the raceway surface of the guide wheel body is reduced, and the diameter of the guide wheel body is reduced.

　　Support sprocket wear

　　The wear of the supporting sprocket is caused by contact with the raceway surface of the chain link. The performance is as follows: the width of the flange of the carrier roller is reduced, the outer diameter of the raceway surface of the carrier roller is reduced, and the outer diameter of the flange of the carrier chain is reduced.

　　Support roller wear

　　The wear of the supporting roller is the same as the wear of the supporting sprocket and guide wheel, which is also caused by contact with the raceway surface of the chain link. The specific performance is as follows: the diameter of the outer flange is reduced, the diameter of the raceway surface is reduced, the diameter of the bilateral inner flange is reduced, the width of the bilateral inner flange is reduced, and the width of the outer flange is reduced.

　　The above situation owners carefully check the wear level of the chassis walking device every day before construction. If problems are found in advance, the repair should be repaired, and the replacement should be replaced, forming relatively stable wear and prolonging its service life.