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The size of the working clearance will directly affect […]
The size of the working clearance will directly affect its working performance and service life. The working clearance is subject to centrifugal force. Manufacturers and users usually manufacture and select bearings according to the radial clearance. As clearance refers to the clearance when the linear bearing is in a stable working state. Appropriate working clearance will help to improve the research of the cooperative system, and the correlation of various factors is not considered. The calculated results have a large deviation from the actual situation. In fact, the temperature field of the bearing operation is non-uniform, and the three are the same. correlational.
Generally, bearings can be used until fatigue life is reached if used correctly. However, there will be cases of accidental premature damage and intolerance of use. This early damage, as opposed to fatigue life, is a quality service limit called failure or accident. Many of them are caused by careless installation, use, and lubrication, foreign matter intruding from the outside, and insufficient research on the thermal effect of the shaft and housing.
In the work of HRB bearing, there are many factors that affect its clearance, mainly the temperature change, centrifugal force and coordination of the linear bearing. During the working process, due to the influence of centrifugal force, coordination and temperature, the working clearance changes, and sometimes the influence of the same three factors is not isolated from each other, but interrelated. Therefore, in this way, the influence of the three on the working clearance of the bearing can be correctly reflected in actual work, so as to reasonably determine the bearing clearance and improve the working efficiency and operation accuracy of the bearing.
Regarding the damage status of HRB bearings, such as: the ring of the roller bearing, the rib of the rib, the reason can be considered, the lack of lubricant, inappropriate, the defect of the oil supply and discharge structure, the intrusion of foreign matter, the installation error of the linear bearing, the shaft If the deflection is too large, there will also be coincidence of these reasons.
Selecting the specifications, dimensions and accuracy according to the use location, use conditions and environmental conditions, and matching the appropriate bearing is the premise to ensure the bearing life and feasibility.
1. Parts of use: Tapered roller bearings are suitable for bearing combined radial and axial loads mainly based on radial loads. They are usually used in pairs with two sets of bearings. They are mainly used in the front and rear hubs of automobiles, driving bevel gears, differential Gearbox, reducer and other transmission parts.
2. Allowable speed: in the environment of correct installation and good lubrication, the allowable speed is 0.3-0.5 times the limit speed of the linear bearing. Under normal circumstances, 0.2 times the limit speed is the most appropriate.
3. Allowable inclination angle: HRB bearings generally do not allow the shaft to be inclined relative to the housing hole. If there is an inclination, the maximum shall not exceed 2′.
4. Allowable temperature: Under normal load, and the lubricant has high temperature resistance and sufficient lubrication, the general bearing is allowed to work at an ambient temperature of -30℃-150℃.
The state of operation on a machine that needs to be checked, where bearings are the focus of attention, and the preparation of a thorough inspection program has become increasingly important. Because it is the most important condition monitoring of all rotating machinery components, it is an important part of the home to prevent bearing damage, to prevent unscheduled maintenance during equipment downtime and to cause early detection of HRB bearing damage.
But not all machines are equipped with this advanced equipment. In this case, the machine operator or service engineer must insist on bearing failure signal alerts.
Therefore, it is difficult to know the real cause of the damage only by investigating the bearing damage. However, if you know the machinery used for the bearing, the conditions of use, the structure around the linear bearing, and the situation before and after the accident, combined with the damage status of the HRB bearing and several reasons, you can prevent similar accidents from happening again.