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roller ball bearing - China Manufacturer
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The so-called bearing clearance, referring bearing mounted on the shaft or bearing housing, the party of the inner or outer ring fixed, then it is not a fixed amount of movement and either the radial or axial movement. Radial clearance and axial clearance can be divided according to the direction of movement.
The size of the clearance operation (called working clearance) affect the performance of the rolling bearing fatigue life, temperature rise, noise, vibration.
Measuring the bearing clearance, in order to obtain a stable measurement value, typically applied to the bearing a predetermined measuring load.
Therefore, the obtained measured value than the real clearance (called theoretical clearance), i.e. to increase the elastic deformation amount generated by the measuring load.
But for roller bearings, due to the elastic deformation amount is small, can be negligible.buy bearing
Install the front bearing internal clearance general theory clearance.
The complete bearing radial clearance is not easy to measure, measuring force the rings and rolling elements and its contact elastic deformation, deformation is caused by the multi-factor measurement error, measuring force, contact state and rolling element location. The bearing rotation flexibility generally checked in a horizontal position, the inner ring is usually fixed (or handheld inner ring) hand rotating outer ring, abnormal noise and block check bearing rotation. In general, the duration of bearing rotation long, slow stop, like flexibility. Conversely, short rotation time, stopped suddenly, flexibility is bad. Bearing structure type and size should also have different requirements for their rotation flexibility. Such as single row radial ball bearings, single row angular contact ball bearings, rolling contact area between the body and the ferrule is small, these bearings rotate when light, double row spherical bearings and thrust roller bearings, due to rolling element and raceway contact area, while the outer ring of lesser weight, check its rotation flexibility, though with a certain load, but its brisk not as single row radial ball bearings. Large bearings, when it rotates, there should be no jamming, but generally not to check the rotating sound. For tapered bore bearings, rotating flexibility available supplement checks bearing the following methods, as follows: cone bearings pressed into the mandrel up with a certain radial pre-load, in this pre-load, when a ferrule rotation to hear the rolling elements should rotate. If the rolling body is sliding rather than rotating, said ferrule the geometrical shape defect excessive or uneven rolling body size, the rotational flexibility of the bearing is also poor.machine bearing
Measuring the radial bearing clearance Note
(1) As far as possible, using special instruments measuring method.
(2) the use of hand-push method measurement requires measurement have higher measurement skills. This method is the measurement error, especially clearance marginalized, easily lead to error, should prevail instruments to measure.
(3) feeler, should be the standard provisions of operation shall not use the roller method of measuring feeler on rolling past.
(4) measurement process should ensure that the ball fall into the ditch; closed type bearings before the closure of measurement; the Dutch instrument is used, the measured value should also be less load due to the amount of the increase in clearance.
(5) For multi-row bearings, the requirements for each column clearance qualified, whichever is the arithmetic mean of each column clearance as the radial clearance of the bearing.miniature bearing
