NTN is the world's integrated manufacturer of precision machinery
Standard bearing
Deep groove ball bearings, small and miniature ball bearings, self-aligning ball bearings, radial ball bearing, cylindrical roller bearings, tapered roller bearings, self-aligning roller bearings, thrust bearings, special purpose bearings.
Large bearing
In the JIS specifications, diameter more than 180mm above the bearing as large bearings. NTN in various forms in the amount of products are also more than 5m, and carrying a single load bearing more than 14,000 tons of products.
Needle roller bearings
Needle roller bearings needle roll is a cylindrical body, smaller diameter, while the length is 3 to 10 times the diameter. Although the narrow cross-section of needle roller bearings, but the proportion of the load than the plain bearing with a large size. Because the number of multi-needle, so the rigidity and inertia, for swinging motion, the application of these bearings enables small and lightweight mechanism to facilitate the sliding bearing to bearing replacement.
NTN uc205 bearing parameter
NTNUC205 (SKF representation YAR205-2F) (FAG representation of 56205)
Category: with the top wire, spherical ball bearings
Diameter: 25mm
Diameter: 52mm
Width: 34.1mm
Basic load ratings dynamic C14kN; static C07.8kN
Fatigue load limit Pu0, 335kN
Speed limit 7000r/min
Volume 0.17kg
The value of the so-called normal temperature rise is not, basically there is no standard work environment.
When the clearance operation (called the work of clearance) the size of the rolling bearing fatigue life, temperature, noise, vibration and other properties affected.
Less clearance from the theory of the shaft or bearings inside the enclosure due to the interference fit ring generated by the expansion or contraction in the amount of clearance after called "installation clearance."
Modified the installation because of bearing clearance on the size of the internal temperature difference after the change in the amount of clearance called "effective clearance."
Bearings fitted with mechanical load placed on the subject when a certain clearance, clearance with the effective load bearing elastic deformation generated by the so called after the "work clearance."
When the work is slightly negative clearance, the bearing fatigue life of the longest but with the increase of the negative clearance was significantly decreased with fatigue life.
Therefore, the choice of bearing clearance, generally the work clearance is zero or slightly better. Need to improve the rigidity of bearings may be required to reduce the noise, the work should further be negative clearance, and in the bearing temperature rise dramatically, further work will have to take positive clearance, etc., must also be done under conditions of use specific analysis.
NTN Bearing prefix ET and 4T What is the difference
NTN ET and 4T are their internal standards, 4T is in line with U.S. standards interchangeable bearing inner and outer rings, ET is in line with the Japanese standard interchangeable bearing inner and outer rings
NTN bearings with cylindrical holes pressed into the press method
NTN bearings are widely used small presses push method. The pad into the inner pad, with the press quietly and closely pressed to the inner block access to the shaft shoulder up. Install the inner pad outer mat is the indentation caused by raceway, crushing the reason, so be absolutely prohibited.
Operation, preferably in advance with the surface coating of oil. Beat with a hammer last resort with the installation of the occasion, to work in the inner pad on the mat. NTN Bearing this approach often become operational reasons, therefore, used only a small amount of surplus situation, the interference can not be used for large or medium and large NTN bearings.
NTN deep groove ball bearings as a non-separable class of NTN bearings, inner ring, outer ring of the amount of interference need to install the occasion, with a cushion pad, with a screw or hydraulic, will be pressed into the inner and outer rings at the same time . NTN-aligning ball bearing outer ring tilt is easy, if not fit, it's best to pad pad installation.
NTN as cylindrical roller bearings, tapered roller bearings NTN NTN Bearing Separate classes can be inner and outer rings are mounted to the shaft and housing, will be installed when the combination of inner and outer rings, key that will both close firmly so that the two centers do not produce deviations from the force caused by pressure raceway membership card injury.
How to adjust NTN Bearing error
NTN bearing part in the processing of each procedure in order to obtain NTN Bearing Surface size, shape and location accuracy, he will have on the machine tool, fixture and tool adjustment, no adjustment will definitely bring some error. NTN bearing parts machining and processing of precision mass production often requires different adjustments used in different ways.
NTN bearings such as large-volume production, the general template, sample, and by the mode of block such as adjusting the process system; in single and small batch production, usually using the scale on the machine or the use of gauge blocks to be adjusted. The contents of adjustment due to the complexity of the different parts, for the simple surfaces (eg, the cylindrical cylinder), generally only adjust the relative position of the shaping movement; and for the complex surface (such as the spiral side, involute), then we must adjust the forming velocity relationship. Therefore, adjusting the error is caused by many factors.
NTN bearings to prevent premature failure of several proposals
1, to select the appropriate tools or professional installation of bearings, use special detection equipment installed.
2, to select the correct lubricant or lubricating oil, lubricant filling the correct way.
3, best not to open before use imported bearing packaging; installed to keep the environment clean installation of the bearing to be used for cleaning; enhance the bearing seal.
4, bearing long-term overload operation; not timely maintenance; improper maintenance; equipment aging.
NTN bearings, now widely used in the production for use in all areas of precision machinery. How to minimize the friction coefficient and improve energy efficiency? NTN bearing technology to the world's only nanometers unit size - nano level accuracy. The precision of the past is purely wishful thinking, and now have begun to use in-orbit satellite, aviation, railway and automotive, papermaking equipment, office equipment and food machinery and other industrial sectors in all areas!
