December 20, 2006
Development of the World's Smallest Tapered Roller Bearing
-Bearing bore is 5mm. 14 times the life and 5 times the rigidity
when compared to a ball bearing of similar size-
NTN Corporation (hereafter, NTN) has developed the world smallest tapered roller bearing, having a bore of only 5mm.
Miniature ball bearings are commonly used in today's market as rolling bearings with a bore as small as 5mm. However, insufficient life and rigidity of these bearings has been an issue under heavy loading conditions. In response to this, NTN has developed tapered roller bearings with high load carrying capacity and rigidity, which enables longer life and compact design, to replace ball bearings with 5mm bores.
The newly developed bearings are to be used in a variety of applications, such as gearbox support bearings. These bearings will usually be pre-loaded and carry relatively heavy loads.
Need for this new bearing is expected to increase due to the smaller size and higher load requirements seen in recent trends.
<Features>
| (1) | World smallest tapered roller bearing | |
| ·Dimensions: | Bore 5.0mm × Outer dia.17.0mm × Width 10mm | |
| ·Conventional smallest tapered roller bearing: | Bore Φ9.4mm × OD Φ23mm × Width 13mm | |
| ·Weight: | 11g | |
| (2) | Longer life: | 14 times (In comparison with ball bearing in similar size) |
| (3) | Higher rigidity: | 5 times (In comparison with ball bearing in similar size) |
<Application>
| Gearboxes, Medical equipments, Micro machines, etc. |
<Ball bearing in similar size>
| JIS-635(I.D. Φ5×O.D. Φ19×Width 6mm) |
<Product Photo>
<Bearing Specifications>
| (1) | I.D. 5mm×O.D. 17mm×Width 10mm | ||
| (Conventional smallest sized bearing: I.D. 9.4mm x O.D. 24mm × Width 13mm) | |||
| (2) | Weight: | 11g | |
| (3) | Basic dynamic load rating: | Cr = 5100[N] | |
| Basic static load rating: | Cor = 3900[N] | ||
| (4) | Material: | I/R, O/R, Rollers-Bearing steel, Cage-Plastic | |
<Production issue and its solution>
| Production Issue: | Improving the bearing assembly efficiency | |
| Solution: | Clamping process is eliminated using plastic cage instead of pressed steel cage. |
<Performance>
| 1) Long life |
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| 2) High rigidity |
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