How to measure Japan NTN bearing clearance vibration phenomenon

How to measure the bearing clearance, how to ensure the clearance measuring accuracy whether is a lot of users in the measurement of bearing clearance frequently encountered problems, below we will introduce you about Japan NTN bearing measurement way and pay attention to the aspects and some measurement techniques. Bearing clearance, namely bearing in the bearing box mounted on shafts or not, will it a fixed housing, then the party has not been fixed do radial or axial movement of the mobile. Generally speaking, the duration of the bearing rotates, stop slowly, flexibility is good. On the other hand, the rotation time is short, stop all of a sudden, flexibility is bad. According to the moving direction, can be divided into radial clearance and axial clearance. A complete set of bearing radial clearance, it is not easy to measure, measure the force to make ring and rolling body itself and its contact produce elastic deformation, the deformation is measurement error caused by many factors, it has to do with measuring force, contact state and the position of the roller are related. Japan NTN bearing rotation flexibility general check in a horizontal position, usually the inner ring fixed ( Or holding a inner ring) , turn the outer ring by hand, to check whether there is abnormal sound bearing rotates and blocking phenomenon. Because of different size and bearing structure of the rotating flexibility also should have different requirements. Such as single row centripetal ball bearings, single row angular contact ball bearing, due to small contact area between ring and roller, the bearing rotates is brisk, and double row centripetal spherical bearings, thrust roller bearings, as a result of the rolling element and raceway contact area is larger, and the weight of the outer ring is small, when check the rotation flexibility, coupled with a certain load, but its light degree is still less than single centripetal ball bearings. For oversize bearings, when its rotation, should be no jam phenomenon, for rotating noise doesn't check. Supplement for cone bearing, can use the following method to check bearing rotating flexibility, specific operation is as follows: to press the bearing tapered bore into mandrel until combined with certain radial load, under the preload, when a ring rotates to listen to a rolling body should be turning. If the sliding roller instead of rotation, the said ring geometry defect too much or uneven size of roller, the rotation of the bearing flexibility is poor. Close cooperation between bearing ring with the bearing or the shaft, bearing ring with adjacent components are likely to match the shape and deformation. If there is a deformation, can produce vibration in the operation. Therefore, the bearing and the shaft are machined to the required tolerance is very important. Due to loading quantity change roller bearing vibration. When a load on a bearing radial load, the number of rolling element bearing load will be a slight change in the operation, that is to say, this caused the load in the direction of migration. At this time of the vibration is inevitable, but can be by axial preload to ease, loading in all rolling body ( Do not apply to the cylindrical roller bearing) 。 Local damage of the bearing. Due to the operation or installation errors, a small number of bearing raceway and rolling element may be damaged. In operation, the vibration of the rolling bearing damaged parts will produce a particular frequency. Vibration frequency analysis can identify the damaged Japan NTN bearing parts.