4 Key project analysis and assembly quality inspection of the spindle assembly
The spindle assembly is composed of one piece, and the processing quality of each piece will affect the assembly quality of the assembly. However, even if the quality of each piece is qualified, it is difficult to ensure that the assembly quality meets the design requirements. Error accumulation and assembly operation problems. In order to ensure that the assembly meets the design requirements, we have tested the spindle assembly as follows: 1) The combined gear 4 is manually moved by hand, and the gear will drive the planetary gear pair to rotate. The hand planetary gear pair should be flexible and unimpeded. Stagnation, no bumps. 2) Turning the handwheel 1, the handwheel will drive the main shaft to rotate, and the rotation of the main shaft will drive the cross shaft to rotate, so that the four planetary gears 7 revolve around the axis with the revolving motion of the cross shaft, thereby superimposing The differential motion of the spindle system is achieved for the design of the spindle assembly. 3) In order to ensure the axial clearance Δ1 between the right end surface of the cross shaft and the lock nut 10 and confirm that the nut does not interfere with the through shaft gear 11, the thrust washer 3, the combined gear 4, the differential case 5, the cross The shaft 6, the planetary gear 7, and the spherical washer 13 are mounted on the main shaft as shown in the figure. After tightening the lock nut 10, the plug is inserted into the gap between the nut and the right end surface of the cross shaft, and the gap Δ1 should be detected at 0.25 to 0.38. In the range; afterwards, the through shaft gear 11, the thrust washer 9, the right differential case 8, the screwing bolt 14 (four, uniform) are inserted, and the dial indicator is placed on the upper end of the through shaft gear. Pulling the through shaft gear by hand in the axial direction, the indication value of the dial indicator should be in the range of 0.05~0.12, which is the gap Δ2 between the gasket 9 and the differential case 8, which is to ensure the planetary gear train. One of the flexible conditions of rotation. If the condition is not satisfied, a set of sizes may be selected in the grouping size of the thrust pad 9 and assembled again to satisfy the condition, as shown in FIG. 4) Load the remaining bolts and tighten. 5) Inserting the bearing 12.6) Finally, the differential lock clutch 2 is reciprocally moved in the axial direction to engage and disengage with the clutch teeth of the combined gear, and if the engagement and disengagement are smooth, the assembly of the main shaft assembly is completed.
Three conclusions
The heavy-duty vehicle main reducer is the key component in the automotive drive train. Its design quality, processing quality and assembly quality will determine the performance of the drive train. The main shaft assembly is the key to the main reducer. The quality of the final drive will directly affect the quality and performance of the final drive. Therefore, under the condition of ensuring the design quality, the processing quality and assembly quality are very important, and the processing quality must be realized through a reasonable process plan. From the perspective of quality assurance and cybernetics, the quality of the final material obtained, no matter how sophisticated machining equipment and process technology, must be verified and verified. Therefore, the detection method and testing technology level of auto parts are not only a yardstick for measuring the quality of an enterprise's products, but also a driving force for monitoring the production process, checking whether the process plan is feasible, and promoting the design department to improve the design of the product.
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