What parameters are needed to calculate the radial force of the
when the equivalent dynamic load P of each bearing is calculated according to equation (13-8a), the radial load f is the radial load generated on each bearing by the radial force F acting on the shaft from the outside; However, the axial load F. is not completely generated by the external axial force F, but should be obtained according to the balance condition between the axial load on the whole shaft (including the derived axial force F e to the radial load f). Let's analyze this problem
according to the radial balance condition of the force, it is easy to calculate the radial load f.. FA on the two bearings from the radial force F acting on the shaft from the outside. When the magnitude and position of F are determined, the radial load f.. F. That's for sure. By F., F. Derived axial forces F, F. The size of can be calculated according to the formula in table 13-7. The calculated value of F, is equivalent to the normal installation condition, that is, it is approximately equivalent to that all the rolling elements of the lower half circle are loaded (the actual working condition of the bearing is not allowed to be less than this
2. The other end is marked as bearing 1. Take the shaft and its matching bearing inner ring as the separating body, if the axial balance is achieved, it should meet the requirements of
F. + FA = FA
If FA and F are obtained according to the formula in table 13-7. When the above relation is not satisfied, the following two situations will appear:
when f u+ F& gt; F The shaft has a tendency to move to the left, which is equivalent to that bearing 1 is "pressed" and bearing 2 is "relaxed". But in fact, the shaft must be in a balanced position (that is, the bearing seat must exert an additional axial force through the bearing elements to prevent the shaft from moving), so the total axial force F on the "pressed" bearing 1. Must be with F. + F. Phase equilibrium, i.e.
F = F. + F.
then, the circular force that the landlord said is the tangential force exerted on the axis, which can be transformed to the axis according to its properties. For example, a tangential force in a fixed direction can be transformed into a radial force and a moment of the axis. The radial force is the same as the radial load of the shaft, so as the landlord said, it is also 1 / 2 of the circumferential force.
The radial direction is the force in the direction of the diameter of the bearing, and the axial direction is the force in the direction of the shaft of the bearing
The results show that the end bearing can bear larger axial force. The bearing types in accordance with the bearing capacity of axial load from small to large are: cylindrical roller bearing & lt; Ball bearing & lt; Tapered roller bearing & lt; Face bearing The axial load of the bearing refers to the load generated in the axial direction of the bearing. Generally speaking, it is the force that will push the bearing inner ring out of the outer ring Axial load is widely used in all kinds of structural vibration. It not only has important research value in theory, but also has a wide range of engineering background For example, in the flight process of rocket missile, there is a large axial compression load, which has different degrees of influence on the lateral vibration characteristics of the missile 
extended data:
the three basic parameters often used in the design of rolling bearings are:
1, the basic rated dynamic load Cr (radial) or Ca (axial) which meets the requirements of certain fatigue life
The basic rated static strength c0r (radial) or c0a (axial) meeting certain static strength requirements and the limit speed N0 controlling bearing wear are2
in order to limit the excessive contact stress and permanent deformation of rolling bearing under static load, static load calculation is needed
The basic formula is: C0 ≥ C0 '= s0p0, where C0 - Basic rated static load, N; C0 '- calculated rated static load, N; P0 - equivalent static load, N; S0 - safety factorthere are also requirements for the inner diameter and outer diameter of the bearing. If you only look at the bearing force and speed, you must have a large bearing, but there are many installations
The axial direction refers to the direction along the axis, and the radial direction perpendicular to it is the radial direction along the axis. So the axial load of the bearing refers to the load generated in the axial direction of the bearing. Generally speaking, it is the force that will push the bearing inner ring out of the outer ring
the radial load refers to the load whose action direction is perpendicular to the axis line of the bearing
relationship between bearing and load direction:
under normal conditions, deep groove ball bearing or cylindrical roller bearing can be selected for pure radial load. If it is a thrust ball bearing, then it is only suitable for bearing an appropriate amount of pure axial load. And the one-way thrust ball bearing can only bear the bearing load from one direction
if it is a two-way thrust ball bearing or a two-way thrust angular contact bearing, it can bear the axial load in two directions. For example, if the bearing bears the combined load of radial and axial, then the angular contact ball bearing or tapered roller bearing is usually used. If it is a four point contact ball bearing and a two-way thrust angular contact ball bearing, then it can withstand the combined load of two directions with the advantage of bearing fou load
However, if the combined load is large, the thrust bearing is only used to bear the axial load, but not the radial load. If a suitable single row radial ball bearing or a four point contact ball bearing is used to bear the axial load, a proper radial clearance should be maintained between the outer ring and the seat holeif the load deviates from the bearing center, it may cause overturning moment. Stainless steel bearing manufacturers, and double row ball bearings can withstand overturning torque, but it is recommended that you choose a pair of angular contact ball, or pair tapered roller bearings, face-to-face type, back-to-back type is better. Of course, you can also choose cross tapered roller bearings
1: the working condition of the bearing, the selection of the bearing, and the working condition determine what type of bearing to use, including the material selection of the bearing, such as st-proof, water-proof and insulation requirements
Two: determine the bearing installation environment. Generally, the load is considered at the time of design, and the engineer will confirm according to the mechanical drawing, such as which type of bearing, ball bearing or roller bearing to choose, because these bearings have the quality of steel, wear resistance and compression resistance when they are designed and proced. This is the radial force on the steel
Three: after the bearings are selected, they are delivered to the designated machinery factory for proction. For example, the running speed of the machinery, the chamfering of the machinery, the installation aperture, and the rated radial load of the proced bearings are formed after testing
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