Spherical roller bearing fit tolerance refers to the sum of hole and shaft tolerances that constitute the fit. It is the amount of variation allowing clearance or interference.
The tolerance and the tolerance zone of holes and shafts form the fit tolerance. The tolerance of holes and shafts indicates the matching accuracy of holes and shafts. The size and position of the tolerance zone of the hole and shaft indicate the matching accuracy and matching property of the hole and shaft.
Size of fit tolerance = tolerance zone size;
Fit tolerance zone size and position = fit property.
Selection of tolerance grade and tolerance grade
The tolerance level of shaft or bearing seat fit with bearing is related to bearing precision. The tolerance level of the shaft matched with the P0 precision bearing is generally IT6, and the bearing seat hole is generally IT7. For occasions with high rotation accuracy and smooth running (such as motors, etc.), the shaft should be IT5, and the bearing seat hole is IT6. Technical personnel under Yiyang Longma Bearing Co. Ltd. will give you details about how to choose the tolerance zone.
Selection of tolerance zone
Equivalent radial load P into the "light" and "normal" and "heavy load" and other circumstances, the bearing load is C rated dynamic relationship: light load P = 0.06C 0.06C P > 0.12C normal load load 0.12C < P
1) axial tolerance zone
The tolerance zone of the shaft with radial bearings and angular contact bearings shall be referenced to the corresponding tolerance band. In most cases, the rotation of the shaft and the direction of the radial load remain unchanged, that is, the rotation of the inner ring of the bearing relative to the load direction, generally should choose the transition or interference fit. The stationary axis and the direction of the radial load remain unchanged, that is, the inner ring of the bearing is relative to the load direction, and the transition or small gap coordination can be chosen (too large clearance is not allowed).
2) enclosure hole tolerance zone
Install tolerance zone of shell hole of radial bearing and angular contact bearing, refer to corresponding tolerance band. In the selection, attention should be paid to the outer race of the outer ring which is swinging or rotating in the direction of load. The size of equivalent radial load also affects the selection of outer race.
3) selection of bearing seat structure
The bearing seat of rolling bearings unless there is a special need, the general use of integral structure, split bearing seat in the assembly only with difficulty, or in the assembly is convenient to use as a major consideration point, but it can not be used in tight fit or more sophisticated, such as K7 and K7 more tightly than with such as tolerance level is IT6 or more precise hole, may adopt a split bearing seat.
Tolerance standard for bearings and shafts
When the bearing diameter tolerance zone which matched with the shaft tolerance zone, in general the basic hole system is central tolerance transition fit will be won with, such as K5, K6, M5, M6 and N6, but won the volume not; when the bearing diameter tolerances and H5, H6, G5, G6 a match, is not be won with clearance.
The outer diameter of the bearing tolerance zone due to the tolerance value is different from the general reference axis, but also a special tolerance zone, in most cases, the outer ring is fixed installation holes in the shell, some bearing parts structure requirements and need to be adjusted, the cooperation can not be too tight, often in conjunction with the H6, H7, J6, J7, Js6, Js7 etc..
Generally, the axis is generally 0 - 0. 005 if it is not often demolished, is 0. 005 ~ 0. 01 of the interference fit can be, if you want to often install and remove is the transition to cooperate with you. We have to consider the material itself when the rotation axis in the expansion, so the bearing more words, is 0. 005 ~ 0 clearance coordination, the limit should not exceed 0. Clearance fit of 01. Another is the moving coil interference, static ring gap.
The tolerance and the tolerance zone of holes and shafts form the fit tolerance. The tolerance of holes and shafts indicates the matching accuracy of holes and shafts. The size and position of the tolerance zone of the hole and shaft indicate the matching accuracy and matching property of the hole and shaft.
Size of fit tolerance = tolerance zone size;
Fit tolerance zone size and position = fit property.
Selection of tolerance grade and tolerance grade
The tolerance level of shaft or bearing seat fit with bearing is related to bearing precision. The tolerance level of the shaft matched with the P0 precision bearing is generally IT6, and the bearing seat hole is generally IT7. For occasions with high rotation accuracy and smooth running (such as motors, etc.), the shaft should be IT5, and the bearing seat hole is IT6. Technical personnel under Yiyang Longma Bearing Co. Ltd. will give you details about how to choose the tolerance zone.
Selection of tolerance zone
Equivalent radial load P into the "light" and "normal" and "heavy load" and other circumstances, the bearing load is C rated dynamic relationship: light load P = 0.06C 0.06C P > 0.12C normal load load 0.12C < P
1) axial tolerance zone
The tolerance zone of the shaft with radial bearings and angular contact bearings shall be referenced to the corresponding tolerance band. In most cases, the rotation of the shaft and the direction of the radial load remain unchanged, that is, the rotation of the inner ring of the bearing relative to the load direction, generally should choose the transition or interference fit. The stationary axis and the direction of the radial load remain unchanged, that is, the inner ring of the bearing is relative to the load direction, and the transition or small gap coordination can be chosen (too large clearance is not allowed).
2) enclosure hole tolerance zone
Install tolerance zone of shell hole of radial bearing and angular contact bearing, refer to corresponding tolerance band. In the selection, attention should be paid to the outer race of the outer ring which is swinging or rotating in the direction of load. The size of equivalent radial load also affects the selection of outer race.
3) selection of bearing seat structure
The bearing seat of rolling bearings unless there is a special need, the general use of integral structure, split bearing seat in the assembly only with difficulty, or in the assembly is convenient to use as a major consideration point, but it can not be used in tight fit or more sophisticated, such as K7 and K7 more tightly than with such as tolerance level is IT6 or more precise hole, may adopt a split bearing seat.
Tolerance standard for bearings and shafts
When the bearing diameter tolerance zone which matched with the shaft tolerance zone, in general the basic hole system is central tolerance transition fit will be won with, such as K5, K6, M5, M6 and N6, but won the volume not; when the bearing diameter tolerances and H5, H6, G5, G6 a match, is not be won with clearance.
The outer diameter of the bearing tolerance zone due to the tolerance value is different from the general reference axis, but also a special tolerance zone, in most cases, the outer ring is fixed installation holes in the shell, some bearing parts structure requirements and need to be adjusted, the cooperation can not be too tight, often in conjunction with the H6, H7, J6, J7, Js6, Js7 etc..
Generally, the axis is generally 0 - 0. 005 if it is not often demolished, is 0. 005 ~ 0. 01 of the interference fit can be, if you want to often install and remove is the transition to cooperate with you. We have to consider the material itself when the rotation axis in the expansion, so the bearing more words, is 0. 005 ~ 0 clearance coordination, the limit should not exceed 0. Clearance fit of 01. Another is the moving coil interference, static ring gap.
