Retaled
"Double Roller Bearing"
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Double roller bearing is one type of the roller bearing.
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"Double Roller Bearing"
BlogNSK machine tools "X1 -ring Ball " upcoming |
10-17 |
Seiko Corporation of Japan (NSK LTD.) In order to achieve long tool life, reduce environmental pollution , the development of suitable areas for machine tools "X1 -ring ball ." Here are distributor of NSK China 's introduction. NSK machine tools "X1 -ring screw " Features:High dustproof performance and grease sealing performance both : NSK X1 -ring seal with a specially designed ball , the outer sealing lip shielded from external dust and debris , grease the inner sealing lip to prevent internal leakage . Compared with the general ball , "NSK X1 -ring Ball " foreign body through reduced to 1/ 30 or less, and grease sealing performance increased 3 times , enabling the machine long life , reduce environmental pollution.Low torque contact seals : NSK X1 -ring seal lip shape ball using the most optimized design, and the use of special resin material in contact with the screw shaft friction is small , along with high slewing ring bearing performance and low torque performance to meet high speed and high precision machine tool requirements. NSK in 2005, the development of high performance seals are widely used in laser processing machines, woodworking machines and other machine tools for use in harsh environments . 2007 NSK based on this technology to develop a grease seal ring , and in the injection molding machine market has been widely praised . With this sealing technology NSK has further developed the slewing ring bearing with the "X1 -ring ball " high dust and grease sealing performance of both performance and torque is low, to achieve long tool life and reduce environmental pollution. NSK machine tools "X1 -ring Ball " as the latest high-speed ball screws for machine tools , will begin selling in April 2011 , is expected in 2013 total sales of high-speed ball screws for machine tools will reach 50 billion yen.
Double row cylindrical roller bearings are divided into two forms: |
09-08 |
⑴ NN0000 type double row cylindrical roller bearings The bearing structure is compact, small deformation under load, it is particularly suitable for machine tool spindle bearing. Its outer wall, so you can install the outer ring and the inner components, respectively (with roller and cage), does not limit the axial displacement of shaft or housing, the same size and radial single row cylindrical roller bearings , can withstand greater radial load. ⑵ NN0000K type double row tapered bore cylindrical roller ball bearing This kind of bearing structure is compact, small deformation under load and therefore suitable for machine tool spindle bearing. Bearing bore is tapered to micro adjust the radial clearance. This kind of bearing outer ring without ribs due, it can be installed separately outer and inner components (with roller and cage), does not limit the axial displacement of shaft or housing, the same size and radial single row cylindrical roller bearings compared to withstand greater radial load.
Double ball bearings are relatively high |
06-18 |
There are several pieces of tiny ball bearings around the axis, or the axis of rotation when the fan page, the ball is followed by rotation. Because all spheres, so friction is small, and there is no leakage problems.Double ball bearing advantage of longer life expectancy, about 50,000 to 100,000 hours; anti-aging properties, suitable for high speed fan. double roller bearing disadvantage is the high cost of manufacture, and at the same speed level noisiest (because ball bearing friction points increased by 2-fold).Dual ball bearing and hydraulic bearing seal better, especially double ball bearings.Double ball bearing fan is embedded in the whole, no moving parts in direct contact with the outside world. In a sealed environment, bearing the working environment is relatively stable. So 5000 rpm level almost all large diameter fan with double ball bearings. The hydraulic bearing due to its unique style oil also back, so are less likely to leak oil.
Double row cylindrical roller bearings are classified |
10-25 |
These bearings are divided into two forms:
(1) of NN0000 double row cylindrical double roller bearing
This kind of bearing structure compact, withstand the smaller deformation when the load is therefore particularly suitable for machine tool spindle bearing. Its outer ring without ribs, so you can install the outer ring and inner ring assembly (with roller and cage), respectively, does not limit the axial displacement of the shaft or housing, with the same radial size of single row cylindrical roller bearings phase ratio, can withstand a greater radial load.
⑵ NN0000K tapered bore double row cylindrical
roll bearings
The bearing structure is compact, withstand the load deformation, and therefore suitable for machine tool spindle bearing. Bearing tapered bore, the trace adjustment bearing radial clearance.
Kind of bearing outer ring without ribs can install the outer ring and inner ring assembly (with roller and cage), and does not limit the axial displacement of the shaft or housing, and the radial size of single row cylindrical roller the bearing compared, can withstand greater radial load.