1, the axial clearance
Axial adjustment is to achieve a certain clearance or preload the bearing capacity, tapered roller bearing assembly can be adjusted to play their best performance. Provided as T1MKEN bearing fatigue life and the relationship between the axial clearance curve, tapered roller bearing axial clearance is close to zero close to the longest life expectancy. Initial assembly and adjustment of axial clearance is obtained at room temperature, bearing before setting to work. Obtained during the axial clearance work is called the axial clearance. Because the working conditions of thermal expansion and by the load and bending, axial clearance to room temperature changes. Axial clearance with the best work environment is different and use at room temperature axial clearance set to change. Application experience or test can usually determine the best work of the axial clearance.
2, adjust the axial clearance method at room temperature
1) applied probability theory, the size of the bearing axial clearance dimensions of the components of radial and axial tolerances.
2) in force under the conditions set by measuring the shims or spacers to complete the axial dimension. Then, from pre-prepared chart or to obtain direct measurement of the correct reading every gasket or ring size. This method not only for the regulation of axial clearance, but also for the axial pre-load adjustment.
3) measuring low speed bearing rolling torque required to determine the axial clearance is appropriate, regardless of the final regulation is pre-load or axial clearance, this method can be applied.
Wheel bearings (wheel hub bearing) of the preload torque with shaft lock nut to ensure that, and then to measure the wheel torque required to rotate and axial clearance.
3, improved wheel enough structure
Improved wheel structure, bearing installation method is as follows:
1) the surface of the bearing 3,5 butter, as much as possible and the roller cage filled the gap.
2) Replace the cover 6, tighten the bolts 7 (torque value should be standard).
Note: In order to achieve the desired axial clearance must be related to the size of the chain dimensions strictly controlled.
Axial clearance X = B-(C + A + D). Through the test to obtain the required axial clearance ×, you can from the control A, B, C, D be the ideal of tolerance in the axial clearance. Bearing life reduction rate in both directions are different: negative clearance along the direction of reduced bearing life very quickly, due to temperature expansion of the inner ring and rolling elements further increases the clearance of the negative, bearing life will be dramatically reduced; along the direction of the bearing clearance is relatively flat life is much lower. Therefore, the value of the general clearance for the lower limit of zero clearance, while the upper limit is clearance along the direction of selection.
More traditional wheel bearing installation and the installation of improved methods, the latter to lower workers' personal skills, while greatly improving efficiency and quality of assembly. Seen, if the wheel bearings (wheel hub bearing) can not be properly co-operation will lead to bearing failure is not normal or even damage the wheels. If the bearing preload adjustment properly, increase the bearing axial clearance bearings will have impact damage; and if the bearing axial clearance decreases, between the roller bearing is difficult to form a complete film, will lead to its burning .
