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Ways to improve the reliability of 7215 bearings (1)
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1. Bearing effect and working conditions The 7215 bearing on the TY320 hydraulic torque converter is an angular touch ball bearing in a back-to-back paired device; (bearing rear code plus /DB). The inner ferrule of the bearing is in the turbine On the hub; the outer ring is mounted on the pump wheel; an important effect of the bearing is axial positioning; that is, to ensure that the axial direction between the pump wheel, the turbine and the guide wheel of the torque converter has a certain clearance; The torque converter does not bump or collide during the three rounds of operation. If the bearing is damaged, the friction will be rubbed between the three wheels; the torque converter will not work properly.
The temperature of the bearing in the torque converter is about 100 °C. The inner and outer rings rotate away from the turbine and the pump wheel; the relative rotational speeds of the inner and outer rings frequently change between large scales. The operation of the bulldozer The condition is dozing-reverse-walking-bull; therefore, the axial load of the bearing is also frequently changed. Especially when pushing the earth, it encounters large stones or tree roots; the load is suddenly increased; the pump wheel does not rotate with the engine speed. The turbine speed is reduced agilely and the torque is agile. The relative rotational speeds of the inner and outer rings of the bearing are also improved; and they are subjected to a large axial impact load.
2, bearing damage status and reason analysis based on several cases of bearing damage found; in the pair of back-to-back bearing bearings; as shown in Figure 1; left bearing damage is severe; steel stamping cage deformation cracking; ball appearance Wear and deformation; one side of the bearing inner and outer ring raceways is axially impacted and the shoulder is kneaded and flattened. This situation clarifies that the bearing is frequently subjected to the unilateral axial impact load shown in Figure 1; that is, the bulldozer Often overloaded. The right bearing is not damaged. This clarifies that the preloading load of the paired device bearings is not suitable. Others see more impurities in the lubricating oil; this has many pitting appearances from the balls and raceways. Reflecting that the oil quality is not clean. This clarifies that the lubricant filter protection is not in place.
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