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Needle roller bearings, also known as needle bearings, are a type of rolling bearing characterized by their slender and elongated needle-shaped rollers. Compared to ball bearings, needle roller bearings have a smaller cross-sectional area and volume but possess higher load-carrying capacity. This makes needle roller bearings excel in applications with limited space, particularly in cases of radial space constraints.
Needle bearings are characterized by its lightweight and high load capacity. It is made with relatively heavy but thin outer ring, made from hardened and precision ground materials, thus provides the smallest section height.
Needle roller bearings are renowned for their high precision and low-profile design. Their wider thickness and smaller outer diameter and volume enable them to withstand high loads, making them advantageous for miniaturization, lightweighting, and precision engineering in various machinery. Furthermore, the smaller rotating radius of needle roller bearings leads to lower rotational torque under the same friction force, further enhancing mechanical efficiency.
Needle roller bearings are vital components in various industrial applications, prized for their high load-carrying capacity and compact design. Among the plethora of needle roller bearings available, the TA, HK, HF, NK, NA, RNA, AXK, and KT series stand out for their distinctive features and applications. In this comprehensive guide, we will delve into these series, elucidating their unique characteristics, applications, and advantages.
Learn More: Needle Bearing Size Chart: Find Your Perfect Fit Easily!
| Needle Roller Bearings | Other Bearings | |
|---|---|---|
| Design |
Long, thin cylindrical rollers (needles) with a high length-to-diameter ratio. |
Various designs with different types of rolling elements, such as balls or larger rollers. |
| Applications | Commonly used in applications with limited space and high radial load requirements. | Have diverse applications based on design, such as deep groove ball bearings for high-speed operations and tapered roller bearings for handling radial and axial loads. |
| Load-Handling Capacity | Excel in handling radial loads while maintaining a compact design. Less suitable for high-speed or heavy axial load applications. | Varies based on type; for example, deep groove ball bearings for high-speed applications and tapered roller bearings for both radial and axial loads. |
The TA series, also known as drawn cup needle roller bearings, are characterized by their thin-walled outer rings drawn from high-quality steel. These bearings are compact and offer excellent performance in applications where radial space is limited.
Drawn cup needle roller bearing(TA Series) is one of the needle roller bearings. It composed of thin walled punched outer ring, retainer and a group of needle rollers. It is usually formed with thin steel plate through precision punching with very sectional height and big load capacity, so it is suitable for the needed of the low cost and mass produced.
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Similar to the TA series, HK series bearings also feature a drawn cup design. It composed of thin walled punched outer ring, retainer and a group of needle rollers. It is usually formed with thin steel plate through precision punching with very sectional height and big load capacity, so it is suitable for the needed of the low cost and mass produced.
Drawn cup needle roller bearing is used between the needle bearings and the bearing cage, and no axial fixture device is required. Even under the condition of high speed and heavy load, the original function of the bearing can be fully maintained, and not to be easily damaged. Due to the high storage volume of grease, the drawn cup needle roller bearing possibly without lubricating for a long time.
The HF series, or needle roller freewheel bearings, enable rotation in one direction while preventing reverse motion. These bearings are essential in applications requiring backstopping or overrunning functions, such as conveyor systems, indexing mechanisms, and packaging equipment. HF bearings ensure precise motion control and prevent unintended movement in mechanical systems.
The one-way drawn cup needle roller clutch bearing(HF Series) is composed of thin wall punched outer ring and plastic retainer. The punched outer ring is made of alloy steel, and there’s the inradius surface which holds the needles tightly. The needle clutch has very small torque due to its thin radical. Each needle is supported by an independent spring, so higher switching frequency and precision are allowed.
NK series bearings are designed without an inner ring, offering a compact solution for applications where the shaft cannot be used as a raceway. They are lightweight and suitable for high-speed operations. NK bearings find applications in automotive components, such as crankshafts and cam followers, where space and weight constraints are critical considerations.
Entity bushed needle roller bearing(NK Series) is a kind of high capacity bearing with small sectional height. It can operate very flexibly even with the light alloy bearing seat due to its high hard outer ring. There are two series: metric and inch series. Both of which are structured with retainer, full needle and sealing types. Besides, the entity bushed needle roller bearings are divided into two kinds: that with inner ring and without ring. The center shaft is used as rolling body tray for those without inner ring so that its size is even smaller.
Solid drawn cup needle roller bearings are a type of bearing with a small cross-sectional height and high load-carrying capacity. Due to the high hardness of the outer ring, it can be applied to even lightweight alloy bearing seats.
These bearings provide products in both metric and imperial series, with three types of structures in each series: a cage type, a full-needle type, and a sealed type.
In addition, solid drawn cup needle roller bearings are divided into two types: NA with an inner ring and RNA without an inner ring, with the latter using the shaft as the rolling surface to reduce its size.
Solid drawn cup needle roller bearings are a type of bearing with a small cross-sectional height and high load-carrying capacity. Due to the high hardness of the outer ring, it can be applied to even lightweight alloy bearing seats. In addition, solid drawn cup needle roller bearings are divided into two types: NA with an inner ring and RNA without an inner ring, with the latter using the shaft as the rolling surface to reduce its size.
RNA series bearings, similar to NK series but without an inner ring, are ideal for applications with limited radial space. They are commonly found in textile machinery, printing presses, and packaging equipment, offering excellent radial load-carrying capacity and compact design. RNA bearings ensure smooth and efficient operation in confined spaces.
Thrust needle bearing(AXK Series) is composed of tray ring gaskets combined with retainer with needle roller bearings, the stand leads can hold many rolling element, there are very tiny differences among the elements in the same group. The trust needle bearings can support the bearings with the axial directional load and also can be used as the bearings with good rigidity and minimum axial occupied spaces.
AXK series bearings consist of needle rollers and a cage assembly, providing exceptional axial load-carrying capacity and stiffness. They are indispensable in applications where high axial loads are present, such as automotive transmissions, agricultural machinery, and heavy industrial equipment. AXK bearings guarantee reliable and precise axial motion control, ensuring the smooth operation of mechanical systems.
KT radial needle roller and cage assemblies bearing is a kind of independent bearing unit with high load capacity and rigidity especially applicable for the tray of shaft and seat holes with the unit which is limited in radical dimension. Each needle have excellent operative characteristic due to each needle exactly guided and kept by the retainer.
KT series bearings, comprising cage and needle roller assemblies, are lightweight and compact, making them suitable for high-speed operations. They are commonly used in automotive engines, compressors, and industrial pumps, where their ability to handle both radial and axial loads is crucial for efficient performance. KT bearings ensure optimal functionality in demanding applications.
Needle roller bearings in the TA, HK, HF, NK, NA, RNA, AXK, and KT series play a fundamental role in diverse industrial applications. Understanding their unique features and applications is essential for selecting the right bearing for specific use cases. By choosing the appropriate needle roller bearing, engineers can ensure the seamless operation of machinery and equipment, leading to enhanced efficiency, longevity, and overall performance in various industrial settings.
To obtain comprehensive information regarding the detailed dimensions of needle roller bearings, we recommend downloading our catalog.
The catalog provides in-depth specifications and technical details about various needle roller bearings, including bore diameter, outside diameter, width, and other critical dimensions.
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