(1) the axial clearance
Axial adjustment is to reach a certain amount of load bearing clearance or preload, assembly of taper roller bearing are adjustable to exert its best performance. Such as the TIMKEN company provides the bearing fatigue life and the curve of axial clearance, tapered NACHI 6201 Bearing Parameter http://www.fagbearings-hk.com/newproduct/NACHI-6201-bearings-19411.html axial clearance is close to zero close to the longest service life. The initial assembly and adjust the axial clearance is obtained at room temperature, bearing set before work. Axial clearance obtained during the work is called the axial clearance work. Because of the work under the state of thermal expansion and the load bending, axial clearance under normal temperature will vary. As the best job in the axial clearance environment different set of axial clearance under normal temperature. Application experience or test can determine the best work usually axial clearance.
(2) adjust the method of axial clearance under normal temperature
(1) the basis of the principle of probability, the axial clearance size of bearing parts of the radial and axial size control.
(2) under the condition of applying pressure setting, by measuring the axial size of the gasket or baffle to complete. Then, from the chart ready or direct measurement of the readings in the correct gasket or baffle size. This method is suitable for axial clearance adjustment, and is suitable for the axial preload adjustment.
(3) bearing rolling torque required for measuring low speed condition, to determine whether the axial clearance fit, regardless of the axial adjustment is pre-loaded or clearance, this method can be applied.
For steyr series axle, according to the experience that the rear axle bearing pre-tightening torque of 13.4 ~ 20.1 N · m; Front axle bearing pre-tightening torque for 5 ~ 6 n. m.
Wheel hub bearing pre-tightening torque with the shaft head lock nut, and then to measure the wheel rotation required torque value and the axial clearance.
(3) the modified wheel for structure
Improved wheel structure as shown in figure 3, bearing installation method is as follows:
(1) in the bearing surface of 3, 5, butter, full of cage and roller clearance as far as possible.
(2) mount plate (6), tighten bolts 7 (torque value should comply with the standard).
Note: in order to achieve the ideal axial clearance, must follow a strict control of the relative size of dimension chain.
Comparing the traditional bearing installation and wheel hub improved installation, which reduced personal skills requirements for workers, assembly efficiency and quality greatly improved at the same time. Visible, if the wheel hub bearings can not correctly, will result in bearing abnormal operation or malfunction, even damage the wheel hub. If improper adjustment bearing pre-tightening force, make bearing axial clearance increases produce wallop will make bearing damage; And if the bearing axial clearance is reduced, it is difficult to form a complete oil film between bearing roller, will lead to the loss