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Needle Roller Bearings

Needle roller bearings use needle rollers as their rolling elements rather than balls. The term "needle roller" usually means that its length is several times its diameter.

Needle roller bearings have a smaller cross-sectional height and could keep the entire machine lighter and more compact, thus maintaining a relatively high load carrying capacity. The key components are the cage (also known as the separator or support) and the needle rollers.

Needle roller and cage assembly can be mounted directly as a stand-alone accessory, or they can be used in conjunction with other parts, inner and outer rings, to form complete needle roller bearings that can be used as stand-alone bearing support mounts.

Needle Roller Bearing Advantages

Needle roller bearings, developed by THB, as one of the most professional needle roller manufacturers in China, have the following advantages:

Because of the small radial cross section of needle roller bearings, they are very suitable for working conditions where the mounting space is small

Optimized needle roller and raceway shape design, so that the bearing has a higher radial load capacity

High precision needle roller bearings can obtain high running accuracy

Needle Roller Bearing Types

The rolling elements in needle roller bearings are cylindrical rollers, which are very thin (the length of the rollers is 3-10 times the diameter, and the diameter is usually less than 5mm), so the radial structure is compact. With the same bore diameter and load carrying capacity as other types of bearings, its radial cross section is the smallest, making it particularly suitable for shaft designs with limited radial mounting dimensions. Needle roller bearings without inner rings or complete needle rollers with cage can be selected for various applications. At the same time, the surface of the journal and the surface of the bore that match with the bearing are directly used as the inner and outer rolling surfaces of the bearing. In order to achieve load carrying capacity and performance equivalent to bearings with raceways, the surface hardness of the raceways, the machining accuracy and the surface quality of shafts and housing bores must be the same as those of bearings with rings. This type of bearing can only support radial loads.

Generally speaking, needle roller bearings are divided into several types, such as needle rollers and cages, drawn cup needle roller bearings, machined needle roller bearings, compound needle roller bearings, etc.

The Installation of Needle Roller Bearing

The installation of full complement needle roller bearings is usually carried out using auxiliary sleeves. At this time, the auxiliary roller or auxiliary sleeve supports the needle roller to prevent it from falling out, and the journal raises the needle roller with its own chamfer. As the needle bearing moves inward on the journal, the auxiliary roller or the auxiliary sleeve will withdraw slowly until it is installed in the working position.

The outer diameter of the auxiliary roller and auxiliary sleeve should be 0.1-0.3mm smaller than the shaft diameter. When installing, first coat the inner surface of the bearing outer ring with grease, stick the needle roller close to the inner surface (there should be a gap when inserting the last needle), and then use the auxiliary roller instead of the journal or inner ring of the bearing. Or push the auxiliary sleeve into the inscribed circle composed of needle rollers, and align its end face with the end face of the mounting shaft or the end face of the inner ring of the bearing that has been installed on the shaft, and then tap it with a press or a hand hammer to apply pressure.

Needle roller bearings can also be installed in this way, that is, apply a thin layer of lubricating oil to the outer diameter of the auxiliary sleeve and insert it into the outer ring of the bearing, so that the outer diameter of the auxiliary sleeve and the outer ring raceway of the bearing form an annular space, and then install needle rollers in the annular space. After the needle roller is installed, use the working shaft to push out the auxiliary sleeve.

For needle roller bearings without inner ring or outer ring, during installation, first apply a thin layer of grease to the rolling surface of the shaft or housing hole, and place the needles on the grease at the installation site in turn. There should be a gap when placing the last needle.

On the circumference of the needle bearing, it is not advisable to squeeze the last needle in, or miss one needle, because the bearing will be stuck and unable to rotate during hard squeezing; when there is needles missing, the gap will be too large, which will easily cause the needle rollers to twist and break when the it is running. For needle roller bearings with a stamped outer ring, they are not allowed to be hammered and installed because of the extremely thin outer ring wall, and the needles should be pressed in by pressing machine. Because the pressure is uneven when hitting by the hand hammer, it is easy to cause locally deformation of the outer ring of the needle roller bearing.

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Miniature Ball Screw

Miniature Metric Precision Ball Screws are an efficient and cost-effective solution in a small envelope, ideal for use in small spaces. Ball screw assemblies range from 4 to 14mm in diameter with leads from 1 to 20mm - all with standard lead accuracies of ±52µm/300mm. Miniature Rolled Ball Screws are ideal for laboratory, semiconductor, and medical applications.

Miniature Ball Screw Specifications

Raw Material 

Surface Finishing

GCr15

chrome plate (CR)

SS440C

tungsten disulfide  coating (WS)

SS316

molybdenum disulfide (MS)

SS316L

Low temperature black chrome plating (BR)

SS304

black coating (BL)

VXO Available Ball Screw Model

VXO Available Ball Screw Model

Diameter(mm)

Lead(mm)

1

2

2.5

3

4

5

6

8

10

12

16

4

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√

√

5

√

√

6

√

√

√

√

√

8

√

√

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√

√

√

√

10

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√

12

√

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√

√

√

√

√

14

√

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√

√

16

√

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√

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20

√

√

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√

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√

25

√

√

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Metric Thread (DIN13)

Metric threads are manufactured according to strict specifications defined by the ISO standardisation authority to ensure cross-compatibility between mating components.

Specification Of Metric Thread (DIN13)

Metric Thread (DIN13)

Screw Lead Diameter

0.25

0.35

0.4

0.45

0.5

0.7

0.75

0.8

1

1.25

1.5

2

2

◎

○

2.5

◎

○

3

◎

○

4

◎

○

5

◎

○

6

◎

◎

○

7

◎

◎

◎

○

8

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◎

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○

9

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○

10

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Linear Module

Continuing the decades-long tradition of high-quality, innovative and precise linear motion products, VXO linear guideways are available in a variety of sizes and styles with features that can be matched to your exact application requirements. VXO offers a variety of linear guide rail series, each with different sizes, load capacity, precision and more other option. The optimized U-rail not only guides the movement of the slider being driven by the ballscrew, but also can be used as a structural component when assembled into a multi-axis motion system.

Types of Linear Module

when choosing an single axis based on different conditions and restrictions, you may refer to the following selection process: user requirements, demand for precision, configuration motor selection, motor load calculation, operation analysis.

Benefits Of Linear Module

An integrated system

Easy installation and maintenance

Compact and lightweight

High accuracy

High stiffness

Complete line of accessories

The structure of rail is analyzed by FEA to get the best rigidity and weight. The analysis results are show as the right figures

Features Of Linear Module

Integrated drive motor for positioning

High and medium speed solutions

Maximum accuracy thanks to precision rails

Various motor versions and direct drives

Applications Of Linear Module

The company’s linear slide module products are widely used in automated production equipment, dispensing, painting, welding, packaging, handling, inkjet, laser, engraving machine, robot, photographic slide, electric slide, scientific research, functional demonstration, etc., Whatever the project is, we minimize your engineering effort and take care of it for you.

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Linear Guideways

Continuing the decades-long tradition of high-quality, innovative and precise linear motion products, VXO linear guideways are available in a variety of sizes and styles with features that can be matched to your exact application requirements. VXO offers a variety of linear guide rail series, each with different sizes, load capacity, precision and more other option. The coefficient of friction on a linear guideway is only 1/50 compared to a traditional slide and they are able to take loads in all directions. With these features, a linear guideway can achieve high precision and greatly enhanced moving accuracy. We offer multiple linear guideway series, each featuring different options for sizes, loading capabilities, accuracies, and more.

Types of Linear Guideways

VXO linear guideway allows a type of linear motion that utilizes rolling elements such as balls or rollers. By using re-circulating rolling elements between the rail and the block, the load platform can easily move linearly with high precision along the slide rail. Compared to a traditional slide, the coefficient of friction for a linear guideway is only 1/50. With these features, linear guideways can greatly enhance moving accuracy, especially, when accompanied with precise ball screws.

How Do You Select Linear Guideways?

When choosing a recirculating linear guide, there are several criteria that need to be specified, including size, preload and accuracy. And although the term “accuracy” is often used in a generic sense, when referring to recirculating ball or roller guides, it designates five characteristics:

Advantages Of Linear Guideways

Smooth and stable operation

Compact, lightweight and low price

High load capacity due to R-shaped groove

Four-point contact to carry load and moment in all directions

440 Series Stainless

Extra wide type available

Applications Of Linear Guideways

How to choose between the main types of linear technologies, and how to design automation systems that deliver optimal performance using design requirements, rather than cost, as the primary consideration in selecting linear components.

APPLICATIONS

Precision Industry & Semiconductor

Inspection & Testing & Assembly equipment

Optical & Medical high positional equipment

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Lead Screw Nut

VXO Linear Technologies offers manufactures a wide array of lead screw nut and acme screw nut options in materials including POM, Peek, Torlon, Acetal and Nylon, and metal - including bronze, brass, stainless, and alloy steel. We offer anti-backlash nuts, sleeve nuts, bronze nuts, heavy-load nuts, trunnion mounting nuts, and more -- all with multiple styles, sizes, and material options. Or, we can custom manufacture a nut to meet your specific linear motion application needs.

Features Of Lead Screw Nut

To meet the need for economical solutions in the field of linear motion, VXO offers two standardized lines of lead screws and nuts in addition to the made-to-order lead screw and nut assemblies built to meet individual customer specifications and tolerances.

VXO Anti-Backlash Lead Screw Nuts and Lead Screws

Rolled Acme stainless steel lead screws come in commercial and precision quality.

Depending on the application, acme lead screws are available in lead accuracies from .003 in/ft with straightness of .01 in/ft to .0001 in/in with positional repeatability of .00005 inches.

Benefits Of Lead Screw Nut

Large load carrying capability

Compact

Simple to design

Easy to manufacture; no specialized machinery is required

Large mechanical advantage

Precise and accurate linear motion

Smooth, quiet, and low maintenance

Minimal number of parts

Most are self-locking

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Lead Screw And Nut Assembly

Lead screw assemblies from VXO are designed for maintenance-free operation and offer an extended service life. Our lead screw nuts are designed with self-lubricating engineered composite plastic materials, eliminating the need for external lubricants and lead screw coatings. In addition to trapezoidal and ACME lead screws, we offer a proprietary high helix design that’s asymmetrical to our plastic nuts. This design helps optimize lifetime and offers higher efficiency.

Applications Of Lead Screw And Nut Assembly

Industries:

Automotive, Packaging, Food and Beverage Production,

UV Robot And Disinfection Automation

Features Of Lead Screw And Nut Assembly

Self-lubricating, engineered composite plastic nuts

Maintenance-free assemblies

No coatings or external lubricants required

Higher efficiency rating

Proprietary high helix lead screw design for higher speeds and optimize service life

Predictable service life

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Lead Screw

VXO precision lead screws are an excellent economical solution for your linear motion requirements. For more than 15 years, VXO has designed and manufactured the highest quality lead screw assemblies in the industry. Our precision lead screw ensure accurate positioning and product lead time is 7-15 days. We also produce Trapezoidal thread, Unified screw thread, ACME screw thread, special Pitch, and multiple start thread. Nut configuration is not restricted and it is possible to manufacture in accordance with customer's design.

Types of Lead Screw

No other linear motion component combines the speed, accuracy, efficiency, repeatability, quiet operation, lubrication retention, load capacity, and compactness of VXO lead screws. Our lead nuts are available in a standard threaded or flanged mounting configuration, and anti-backlash nuts provide the best positional repeatability.

Advantages Of Using Lead Screws

Lead screws have many advantages – some of these are;

High load-carrying capacity

Compact

Easy to design into a system

Minimal number of parts

Smooth operation

Quiet

Require little maintenance

Where Is A Lead Screw Used In Real Life?

Lead screws are often used in linear actuators, machine tools, screw jacks, presses and vises.

Lead screws are also found in biomedical environments such as clinics and hospitals. For example, lead screws are used in pumps for blood and drugs requiring precise fluid measurement and fluid delivery. They are also used in lab testing equipment such as devices that sample, scan and handle fluid.

Other popular industries in which lead screws are used include defense, transport and industrial automation.

What Is The Difference Between A Lead Screw And A Ball Screw?

Ball screws and lead screws can sometimes be used in the same applications.  Typically, ball screws are used in industry applications that need a lot of load or life while lead screws are used in smaller, lighter duty applications.  Lead screws however are highly customizable with the ability to interchange leads, sizes, nut configurations quickly.  Cost is usually not the primary consideration when selecting a screw technology.