Bearing sizechart

This clearance should be 0~0.038mm (loose fitting) under oscillation motion, and 0.051~0.102mm (loose fitting) under rotating motion.

Bearing sizelist pdf

The and dynamic load capacity values Cr and Ca provided within the tables of the publication must, in the case of higher operating temperatures, be multiplied by the coefficient ft, as specified in table 5.9.

V-staking is one of the method to fix a spherical bearing into a housing. A V-shaped groove is cut round the face of the race and the race material outside of this groove is pressed into a chamfer of housing with staking tool (Figure 23). Appropriate staking pressure is given in Table 21, and the pressure shall be adjusted slightly depend on the staking appearance shown in Figure 25 and the axial proof load required. Excessive pressure reduces performance capacity and shortens the life of a bearing. After staking, a slight gap may occur in between race and housing chamfer. As long as this gap doesn't exceed 0.15mm, axial load capacity is not affected (Figure 23). V-staking does not disturb bearing performance as much as other methods can bear higher axial load. Bearing replacement is also easily done without damaging the housing.

Figure 22 below shows the appropriate installation method. The ball should NEVER be pressed. The tight fitting spherical should be in a right angle to the housing. Inclining can easily damage spherical bearings.

Bearing sizeformula

Bearing sizecalculator

It is the number of revolutions that a bearing lasts, before fatigue of one of its components occurs, which manifests as flaking of material. It is expressed either as the total number of revolutions or operating hours, or in vehicles, by the distance travelled (number of driven km).

PTFE lined sleeves require 0.013~0.051mm of tight fitting, and spherical bearings require a transition fit, -0.013mm tight to +0.013mm loose. Excessive tight fitting can influence the torque and clearance and leads to a possible fretting corrosion under dynamic load.

Bearingnumber andsizechart pdf

Housing is pressed into race chamfer with staking tool (Figure 24). Body staking can also advance axial load strength, however at the same time torque and clearance can be easily influenced. In addition, the housing needs to be replaced together with the spherical bearing as well. Both V-staking and body staking require large press-machine. There are other staking methods available (Roller staking, and Circumferential-Line staking) which require simple tooling.

In cases, when the required durability for the given housing is not provided in advance, we can appropriately use the values provided in tables 5.4 and 5.5.

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The surface roughness shall be below 0.2μmRa. Rougher surface can shorten the sleeve life. Hardness shall be minimum 50HRC, and chrome plating is additionally recommended under extreme application conditions. Since PTFE type sleeves do not use any lubrication, corrosion resistance capacity shall be considered upon choosing the shaft.

The shaft shall be free of sharp edge and loose particles. The edge of the shaft shall be formed as Figures 19 or 20 with a minimum radius of 0.8mm or a 15°chamfer. Similarly, if a locking thread is to be incorporated in the shaft, extra caution is necessary in order to avoid damaging the Liner. The housing edge shall be also free of burr and sharpness. A hammer shall never be utilized to install a sleeve into a housing.

In practice, the bearing safety under static load is determined from the ratio Cor/Por or Coa/Poa and compared with the data in table 5.10, where the smallest permissible coefficient values s0 are specified for various operating conditions. s_0=C_or/P_or   and/or  C_oa/P_oa  s_0    - safety coefficient under static load    [kN] C_or    - radial dynamic load capacity        [kN] C_oa    - axial dynamic load capacity        [kN] P_or    - radial equivalent static load or max. acting force Frmax (fig. 5.29)    under significant impact load, resp.        [kN] P_oa    - axial equivalent static load or max. acting force Frmax (fig. 5.29)    under significant impact load, resp.        [kN]

øE(Staking Tool Dia.)= øA + 0.1 øA：V-Groove Dia. øC(Housing Chamfer Dia.)= øD + (T - H + 2P) øD：Housing I.D. or Bearing O.D. T：Housing Width H：Race Width P：V-Groove Depth