N25 25*37*7mm Super Precision High-speed Cylindrical Roller
Bearings Without Outer Ring for Robot Reducers
The N25 cylindrical roller bearing without outer ring,inner
diameter d is 25 mm,outer diameter D is 37 mm,the width B is 7 mm.
Cylindrical roller bearings without an outer ring are referred to
as inner-race-only cylindrical roller bearings. These specialized
bearings find use in particular settings, like environments where
space constraints exist or unique configurations are necessary. By
eliminating the outer ring, these bearings offer enhanced
installation flexibility, enabling direct contact with other
components to fulfill specific mechanical roles. In various
industrial applications, including automotive gearboxes and
precision machinery, inner-race-only roller bearings are
extensively utilized. Their benefits, such as a compact design,
reduced weight, and superior load capacity, make them particularly
advantageous in these fields.
| Name | High-speed Cylindrical Roller Bearings for Robot Reducers |
Bearing Number | Boundary Dimensions(mm) | Basic Load Rating(N) | Limiting Speed(rpm) |
| Inner Diameter | Outer Diameter | Width | Chamfer | Dynamic | Static | Grease | Oil |
| d | D | B | r(min) | Cr | Cor | Non-contact |
| mm | mm | mm | mm | N | N | r/min | r/min |
| N9 | 9 | 14 | 3 | 0.3 | 1760 | 1900 | 21200 | 26600 |
| N15 | 15 | 24 | 5 | 0.3 | 2560 | 2800 | 14300 | 17200 |
| N17 | 17 | 26 | 5.6 | 0.3 | 3560 | 3900 | 13300 | 16000 |
| N25 | 25 | 37 | 7 | 0.3 | 5120 | 5600 | 8700 | 10600 |
| N35 | 35 | 47 | 7 | 0.3 | 7390 | 8100 | 7300 | 6500 |
| N45 | 45 | 58 | 7 | 0.3 | 9300 | 10200 | 6900 | 6200 |
This series of products is continuously evolving and advancing in
response to growing customer demand.
Applications of Outer Ringless Cylindrical Roller Bearings (or Full
Complement Cylindrical Roller Bearings without Outer Rings)
Due to their compact structure, high load capacity, and ease of
installation, outer ringless cylindrical roller bearings are widely
used in various fields:
Wind Power and Construction Machinery
Primarily used in the drive systems of wind turbines, gearboxes,
and construction machinery (such as cranes and excavators). The
design without an outer ring prevents sliding failures and
simplifies maintenance, enhancing equipment reliability.
Automotive Industry
Applied in critical components like transmissions and
differentials, meeting the demands of high-speed rotation and heavy
loads. This design optimizes space utilization and reduces
mechanical vibrations.
Precision Machinery and Speed Reducers
In planetary gear reducers and optoelectronic instruments, the
gear's inner bore directly serves as the outer raceway, achieving
structural simplification and space savings. This is especially
suitable for precision systems with radial dimension constraints.
Heavy Equipment and Metallurgy
Used in heavy machinery such as steel rolling mills and mining
equipment, the double-row full-complement design can withstand
significant radial and shock loads, adapting to harsh conditions
characterized by high temperatures and heavy loads.
Aerospace and Specialized Equipment
In aerospace hydraulic systems and precision instruments, optimized
roller profiles and flange designs enhance axial load capacity and
service life, meeting the stringent requirements for high-precision
operation.
By eliminating the outer ring, these bearings utilize the host
component's bore (such as a gear hole) as the raceway. This reduces
the number of parts, lowers friction losses, and achieves higher
load density and spatial efficiency. They are particularly suited
for industrial applications requiring compact designs and the
ability to bear heavy loads.
