KOYO Deep groove ball bearings Single-row Shielded sealed,KOYO Bearing 6921-1 ZZ, Deep groove ball bearings are available in a variety of sizes, and are the most popular of all rolling bearings. This type of bearing supports radial load and a certain degree of axial load in both directions simultaneously. With its wide dimensional scope, the deep groove ball bearing is the most commonly used rolling bearing and is capable of simultaneously receiving a radial load and bidirectional axial load to a certain extent.
The calculation formulas of free misalignment are deduced for single-row deep groove ball bearings and double-row angular contact ball bearings by geometry analysis,and the free misalignment are analyzed and compared for both kinds of bearings.
KOYO Deep groove ball bearings Single-row Shielded sealed,KOYO Bearing 6921-1 ZZ, We propose a methodology for dynamic analysis of multi-body systems with ball bearing joint. Contact force on each ball element can be obtained by the procedure. Eccentricity trajectory is determined by loading characteristic of bearing joint. Bearing clearance and flexibility will reduce the dynamic performance of mechanism.
This study is focused on dynamic modeling of planar multi-body systems with multiple deep groove ball bearing joints, in which the radial clearance, contact deformation, and bearing kinematics are included. By using the approach presented, the variation of the joint reaction force and the dynamic load on each ball element in bearings can be simulated. The deep groove ball bearing joints are modeled by introducing a nonlinear force system, which takes into account the contact elastic deformations between the ball elements and the raceways. The contact force is calculated by the Hertzian contact deformation theory that accounts for the geometrical and material properties of the contacting bodies. A planar slider-crank mechanism with two deep groove ball bearing joints is chosen as an example to demonstrate the application of the methodologies presented in this paper. In this model, one bearing locates at the joint between the ground and crank, while the other one locates at the joint between the crank and connecting rod. By numerical calculation, the dynamic load distribution characteristics of bearings under real mechanism movement conditions are simulated. From the results, it can be concluded that the dynamic load on each rolling element varies differently and belongs to a variable load with the change of mechanism configuration. Load characteristic analysis is the foundation of developing research on the fatigue life and reliability of bearings. This study will provide a key mechanical support for the performance evaluation, dynamic design, and geometrical parameter optimization of the joint rolling element bearings.
■Shielded 1 sealed type
●Simplifies sealing structure of applications.
●Greasing is not necessary because bearings are
Per-lubricated.
●Table 1 on the next page lists major shielded and sealed
bearing types and compares their performance.
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