NNU Series
Double-Row Цилиндрические роликоподшипники
100–500mm Bore | С наружными рёбрами | Разъёмное внутреннее кольцо | P5/P4/P2 Grade
The NNU series имеет ribs on the наружное кольцо and a smooth внутреннее кольцо — the structural inverse of the NN series. This design is optimized for applications where axial displacement is preferred at the вал interface or where the наружное кольцо is the rotating element. Разъёмная внутреннее кольцо облегчает mounting on stationary валs.
Optimized for Outer Ring Rotation and Stationary Shaft Применения
Luoyang Songju NNU series double-row cylindrical roller bearings feature ribs on the наружное кольцо to guide the two rows of cylindrical rollers, with a smooth внутреннее кольцо that is separable from the outer-ring-and-roller assembly. This inverse configuration (compared to NN series) makes NNU bearings ideal for applications where the наружное кольцо rotates — such as printing press cylinders, coating rollers, and paper converting machinery — or where axial displacement is preferred at the вал interface.
The NNU49 dimensional series предлагает a thinner поперечное сечение than the NN30 series at comparable размер отверстияs, resulting in lower weight and reduced centrifugal forces at high rotational speeds. This makes NNU bearings particularly suitable for applications where minimizing rotating mass is important — such as высокоскоростной printing cylinders and lightweight roller assemblies in web processing lines.
Стандартные модели доступны in P5, P4, and P2 класс точностиs from подшипниковая сталь GCr15 with обработанные латунные сепараторы. Разъёмная внутреннее кольцо упрощает installation on stationary валs — the наружное кольцо and roller assembly can be mounted in the корпус first, then the внутреннее кольцо slid onto the вал. W33 suffix variants include a lubrication groove and three oil holes in the наружное кольцо for convenient relubrication access.
Запросить цену
NNU Series — Double-Row Cylindrical Roller Bearing Model Параметры
Complete NNU49 series model list per NTN precision bearing catalog. Все модели доступны с P5, P4, and P2 класс точностиs.
| Bearing Model | d (mm) | D (mm) | B (mm) | Cr (kN) | C0r (kN) |
|---|---|---|---|---|---|
| NNU4920 | 100 | 140 | 40 | 145.0 | 285.0 |
| NNU4922 | 110 | 150 | 40 | 157.0 | 320.0 |
| NNU4924 | 120 | 165 | 45 | 196.0 | 405.0 |
| NNU4926 | 130 | 180 | 50 | 239.0 | 500.0 |
| NNU4928 | 140 | 190 | 50 | 252.0 | 540.0 |
| NNU4930 | 150 | 210 | 60 | 310.0 | 660.0 |
| NNU4932 | 160 | 220 | 60 | 330.0 | 720.0 |
| NNU4936 | 180 | 250 | 69 | 440.0 | 980.0 |
| NNU4940 | 200 | 280 | 80 | 550.0 | 1230.0 |
| NNU4944 | 220 | 300 | 80 | 580.0 | 1330.0 |
| NNU4948 | 240 | 320 | 80 | 600.0 | 1430.0 |
| NNU4952 | 260 | 360 | 100 | 880.0 | 2080.0 |
| NNU4956 | 280 | 380 | 100 | 870.0 | 2100.0 |
| NNU4960 | 300 | 420 | 118 | 1160.0 | 2750.0 |
Все модели доступны с P5, P4, and P2 (ABEC-5/7/9) класс точностиs. Standard material: GCr15 (100Cr6/52100) подшипниковая сталь. NNU49 dimensional series with thinner поперечное сечение than NN30. W33 suffix = lubrication groove + 3 holes in наружное кольцо. B suffix = machined brass cage. NTN, NSK, SKF, FAG interchangeable. Контакты engineering for non-standard sizes.
Почему выбирают Luoyang Songju NNU Series Цилиндрические роликоподшипники
Ribbed наружное кольцо design — optimized for наружное кольцо rotation and stationary вал mounting
Optimized for Outer Ring Rotation
The integral ribbed наружное кольцо обеспечивает the most stable reference surface when the наружное кольцо is the rotating element. Идеально для printing cylinders, coating rollers, and web processing machinery where the bearing наружное кольцо rotates with the drum or cylinder at high speed.
Thinner Cross-Section — Lower Rotating Масса
The NNU49 dimensional series имеет a thinner поперечное сечение than comparable NN30 bearings at the same размер отверстия. Reduced rotating mass means lower centrifugal forces, lower power consumption, and the ability to achieve higher rotational speeds in outer-ring-rotating applications.
Разъёмное внутреннее кольцо
The smooth внутреннее кольцо can be removed from the outer-ring-and-roller assembly — simplifying installation on stationary валs. Mount the наружное кольцо assembly in the корпус first, then slide the внутреннее кольцо onto the вал for a straightforward assembly process.
W33 Смазка Provision
Standard W33 suffix adds a circumferential lubrication groove and three equally spaced oil holes in the наружное кольцо — enabling convenient relubrication without disassembly. Compatible with grease, oil-mist, and circulating масляная смазка systems for flexible integration into existing machine designs.
Machined Brass Cage — Proven Reliability
Double-pronged обработанные латунные сепараторы (B suffix) provide superior roller guidance at high speeds and under fluctuating loads compared to pressed steel or polymer alternatives. The proven cage design гарантирует decades of reliable operation in demanding industrial environments.
NTN / NSK / SKF Interchangeable
Manufactured to ISO dimensional standards for NNU49 series. Direct drop-in replacement for NTN NNU49, NSK NNU49, and SKF NNU49 series double-row cylindrical roller bearings. Same dimensions, same performance — конкурентные цены and faster delivery.
Отрасли и применения for NNU Series Цилиндрические роликоподшипники
NNU серии цилиндрические роликоподшипники are trusted across precision industries worldwide for their unmatched radial performance.
Printing Press Cylinders
NNU series is the preferred bearing for высокоскоростной offset and rotogravure printing press cylinders. The ribbed наружное кольцо rotates with the cylinder at production speeds up to 60,000 impressions per hour — maintaining precise registration through consistent running accuracy.
Paper & Converting Machinery
Coating rollers, calender stacks, slitter-rewinders, and corrugating rolls in paper mills and converting lines. NNU bearings handle the combined radial and moment loads of web tension while the separable внутреннее кольцо позволяет quick roller changes during grade changeovers.
Rolling Mill Backup Rolls
Large NNU bearings support the extreme loads of steel and aluminum cold-rolling mills. The ribbed наружное кольцо design обеспечивает stable roller guidance under the ударная нагрузкаing and vibration conditions characteristic of metal rolling processes.
Large Electric Motors & Generators
NNU bearings with W33 lubrication provisions support the ротор валs of large industrial motors, generators, and alternators. Разъёмная внутреннее кольцо упрощает ротор installation and removal during equipment overhauls and rewinds.
Нужны NNU Series Double-Row Цилиндрические роликоподшипники?
Tell us your размер отверстия, класс точности, lubrication provision preference, and quantity. Наши инженеры ответят within 24 hours with a competitive quotation and technical documentation.