Bearing preload of the role and the role of the principle vehicle (1) Where a shaft with a conical bearing support, the assembly of their support bearings generally are required to have a certain preload degrees in order to reduce bearing gap is generated due to work load, so that change the mutual position of the relevant parts of adverse consequences, which is particularly important for main reducer. Currently active bevel gear bearing preload degrees as follows: loads of active bevel gear tooth surface meshing force can be decomposed into circumferential force, axial and radial forces. After the drive axle, for example, wherein the axial force causes the bearings before the compression deformation of axial movement, if no preload degrees, the front bearing will produce a gap in the engaging force, the gear shaft after the bearing as a fulcrum skew swing, thereby undermining the correct bevel gear meshing prints engagement imprint greatly reduced (to move to one end of the tooth), and seriously affect the service life of the gear. To bearing some pretension degree, that bear the work load before given axial preload, compression elastic deformation of the bearings will improve the deformation resistance, namely to improve the support stiffness. Then bear the working load, the rear bearing compressive deformation decreases, the amount of axial movement of the gear is reduced, the front bearing elastically restored and may produce only preload generated when the elastic deformation of complete recovery after gap, so generating gear tendency to skew and rocking is greatly reduced, to improve the stability of the gear meshing. This is the important role of the the pretension degrees of main reducer cone gear.
(2) the adjusted main reducer main bearing preload degree, driven bevel gear support in their ability to work properly is essential. Because: First drive gear bevel gear, bevel gear drive in engaging high accuracy requirements; is the main reducer conical gear pair in the axial force will work. When active bevel gear to rotate and drive the driven bevel gear rotates itself will be a forward thrust. When the vehicle is coasting, the active bevel gear will be a backward pull. Assembly, give bearing a certain degree of pretension, a considerable pretension stress, which is conducive to active bevel gear stiffness, improve self-centering capability of the gear in the work, and inhibition of the radial the Jitter and axial jump gear action to protect the lubricant film, thereby enhancing the bevel gear pair meshing accuracy, meshing clearance. By improving the bevel gear pair meshing accuracy, reducing wear and transmission gear face noise, can extend the service life of the bevel gear pair.
(3) The degree of adjustment of the active bevel gear bearing preload bearing preload degrees are generally through the thread, the spacer or spacer to be adjusted to change the distance between the two cone bearing inner or outer ring. The structure is different, the adjustment means and the parts different. Active bevel gear bearing preload degrees widespread use adjustment shim adjustments, which is mostly the two bearing outer race distance has been set, is adjusted by changing the distance between the two bearing inner ring. Spacer between the two bearings, active bevel gear shaft axis shoulder, fitted with bearing preload adjustment front spacer or shaft shoulder pads, to increase or decrease the thickness of the gasket bearing preload adjustment to change the two cone The distance between the bearing inner ring. The shim thickness increases, increasing the distance, reduce bearing preload degree; Conversely, the bearing preload degrees increase. After adjustment, hand rotation should be flexible, axial push-pull no gap.
(4) the degree of adjustment of the driven bevel gear bearing preload single-stage the main reducer driven bevel gear bearing differential bearing preload adjustment with the structure varies. Right the integral axle housing, it is usually adjusted by the two differential bearing outer nut, screwed into the nut preload to increase, and vice versa is decreased. Bevel gear, the first level of the two-stage main gear box driven bevel gear second grade active cylindrical gear jointly supported on the intermediate shaft the bearing preload degrees through both ends of the intermediate shaft bearing shim under the hood adjusted The increase in the total thickness of the groups gasket, the preload decreases, the increase in the contrary. The same the second level driven cylindrical gear bearing preload degree adjustment with the adjustment of the single-stage main gear box driven bevel gear bearing preload degrees. Driven bevel gear bearing preload degree of adjustment due to the different structure of the drive axle is divided into the following two: a single-stage main gear box, its driven bevel gear fixed to the driven bevel gear differential case Bearing differential bearing, the adjustment driven bevel gear bearing preload degrees adjust differential bearing preload. In addition, the two-stage main reduction gear differential bearing preload degree of adjustment is the same with this. Differential bearing on both sides of the adjusting nut. When assembled, the differential bearing outer trap on the bearing, the differential assembly loaded differential casing, the both sides of the adjusting nut mounted Chamber hole of the threaded portion must be good, then both sides of the bearing cover cover bolt bearing load after a good thread (left, right, two bearing cap shall not interchangeable), installed locking plate. Adjust bearing preload degrees, slowly turn the adjusting nut on both sides, while slowly rotating the differential assembly, the roller is in the correct position. Correct degree of preload can be used to measure the rotation torque of the differential assembly. Preload adjustment, the adjusting nut should be locked with the locking tab. The second two-stage main gear box, driven bevel gear with double reduction driving cylindrical gear fixed on the same shaft, both ends of the bearings supporting the main reducer shell. Adjust the bearing preload degrees, select the appropriate thickness of adjusting shim installed between the main reducer shell bearing cap. Tighten bearing caps fastening bolts, to measure the rotation torque of the driven bevel gear preload suitability. The rotation driven bevel gear torque is generally 1.47 ~ 3.43N • m, as desired torque is too large, preload is too large, you should increase the thickness of the gasket.


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