The driving wheel and the double gear can be rotatably supported by the rolling bearing mounted in the rear axle housing and the hole at both ends of the gear cover. The reasons for the final drive gear breakage and bearing wear and tear are caused by the fact that the gears and bearings are subject to long-term alternating load wear, material structure fatigue, processing quality error, lubricating oil quality, etc. The site is overloaded, and the transmission and dozers often collide with hard objects on the ground, resulting in strong frictional vibration and distortion, which promotes early fatigue of equipment components, reduces overload capacity and tensile strength, resulting in final drive gear cover and rear The seal between the bridge boxes is not tight, so that the lubricating oil in the gear box leaks.
The driving gear, the double gear, the bearing 1 at both ends of the ring gear wheel housing and the tooth surface of the gear wheel accelerate wear due to lack of lubricating oil, and cause the roller bearing to burn out and break into the lubricating oil in the gear box and rotate with the large ring gear. Into the middle of the two teeth, when meshing with the double gear small teeth, the pin teeth of the small gear teeth and the ring gear are broken.
Support rolling bearings at both ends of the driving wheel, double gear, ring gear wheel housing, etc. are subject to long-term load torsion and corrosion of lubricating oil impurities, and even the bearing goes inside or outside. The most obvious is the installation position of the outer circle of the shaft end of the double-gear large gear shaft shaft and the hole diameter of the rear axle box. The bearing shell is worn by the torsion vibration of the double gear load, causing the bearing hole positioning pin to wear, resulting in the outer force of the bearing shell not being affected. Both of them are swayed in the hole, and the hole grinding loss of the rear axle box is rounded, resulting in misalignment of the two holes of the double gear.
However, the looseness of the nut or the slippage of the screw that is fastened on the half shaft makes the bearing space of the wheel housing increase. When the driving wheel is rotated by the load, the ring gear swings, which directly affects the concentricity of the hole at both ends of the ring gear housing. And the tooth surface of the tooth tooth surface. In particular, the bulldozer changes direction when pushing the object, and the inner driving wheel of the device does not rotate. The output power of the outer final drive drive wheel not only overcomes the ground overload resistance, but also overcomes the self-weight load torque of the device.
The smaller the steering radius of the track shoe, the greater the resistance. In this abnormal gear meshing drive, it is easy to cause the transmission gear teeth to break. For example, if the bearing is broken and the concentricity of the hole at both ends of the gear is seriously misaligned, the gear teeth will move under the load torque, and the tooth meshing contact surface can be instantaneously changed to the end point line contact of one side of the tooth. This sudden overload phenomenon Or the impact phenomenon, forcing the root portion to be subjected to excessive bending stress, which is most likely to cause fracture of the folding teeth.
After the ring gear is bolted to the wheel housing, the nut angle is locked with a metal pad, but a machining error between the two holes has a potential factor of uneven force in the hole. The ring gear and the wheel housing fastening bolts can withstand the alternating torque and severe vibration of the double-sided working of the ring gear for a long time, which is easy to cause fatigue of the bolt, reduce the tensile strength, cause the nut to loosen, and the bolt shears and breaks into the bottom of the gear box. The gap between the ring gear crest and the gear case cover bottom case is that the bolt nut that falls into the bottom case of the gear box has a volume larger than the ring gear rotation gap, and is inevitably squeezed by the large ring gear at both side ends or the tooth tip.
As a result of the large torque of the ring gear, the result is that the bridge box or the gear cover is worn after being worn, and even the lower end of the gear cover is crushed or broken and scrapped. The top of the tooth is forcibly rotated, and the bolt nut is cut into iron scraps by the teeth, which is incorporated into the lubricating oil to accelerate the wear and damage of the bearing and the gear. The ring gear grinds the bolt to a certain extent and is clamped between the two teeth of the ring gear to rotate with the wheel. When meshing with the double gear small teeth, the small gear or the ring gear teeth are broken or the teeth are stuck. Do not turn.
The measures taken establish the location of the positioning pin. Due to the looseness of the gear cover fastening bolt, the two necessary positioning pins on the rear axle box are worn and deformed with the casing hole, and the housing is re-reamed or expanded to wear the casing wear aperture, and the positioning pin is processed according to the new aperture to make the casing It is firm and reliable after assembly and maintains two holes concentricity. The spatula grinds the deformation of the gear cover.
Conclusion There are many reasons for the failure of the gear teeth of the final drive gearbox, the double gear and the ring gear. If each driver follows the equipment safety technical regulations to avoid the illegal operation, often Maintenance and periodic maintenance technical maintenance can completely avoid or reduce the occurrence of gear fractures.
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