Analysis of the limit speed and conflict coefficient of bearings

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Analysis of the limit speed and conflict coefficient of bearings

Source: Bearing network time: 2013-07-22
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The speed of the bearing is mainly limited by the temperature rise caused by the conflict heat inside the bearing; when the speed exceeds a certain boundary; the bearing will not rotate continuously due to burns, etc. The limit speed of the bearing means that there is no conflict and heat that causes burns. The boundary value that can be rotated continuously.
Therefore, the ultimate speed of the bearing depends on the type, scale and precision of the bearing, as well as the smoothing method, the quality and quantity of the smoothing agent, the data and type of the cage, the load conditions, etc. The bearings are smooth and oily ( The limit rotation speed of the oil bath is not shown in the bearing scale table; its value indicates the rotation speed of the bearing depicted in the specification under normal load conditions (C/P>=13, Fa/Fr<=0.25 or so). Boundary value. Other; smoothing agent is different according to its variety and trademark; it can also be used for high speed rotation although it is superior to other functions.
The rated speed of the limit speed is C/P<13 (that is, the equivalent dynamic load P exceeds 8% of the fundamental additional dynamic load C); or the axial load in the accepted component load exceeds 25% of the radial load; The following formula corrects the limit speed. na=f1*f2*n where na: the limit speed after the correction; rpm f1: the correction coefficient f2 related to the load condition: the correction coefficient n related to the composition load: under the normal load condition Limit speed; rpm (refer to bearing scale table) C: fundamental extra dynamic load; N{kgf} P : equivalent dynamic load; N{kgf} Fr: radial load; N{kgf} Fa: axial load; N{kgf } The limit speed with sealed ball bearings The limit speed of the ball bearing with the touch seal (RS type) is limited by the touch surface speed of the seal ring; the speed of the wire is determined by the rubber material of the seal ring.
High-speed rotation focuses on the bearing at high speed rotation, especially when the speed is close to or exceeds the limit speed recorded in the scale table; the first thing to focus on is as follows:
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. ǎ矗┓ 鋈蠡 鋈蠡 捎 ú 捎 捎 捎 捎 捎 捎 捎 捎 捎 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 The conflicting moment can be calculated according to the inner diameter of the bearing by the following formula: M=uPd/2 where M: conflicting moment; mN. m{kgf. Mm} u: conflict coefficient; bearing load; N{kgf} d: bearing nominal inner diameter; mm conflict coefficient u is greatly affected by bearing type, bearing load, speed, smoothing method, etc.
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