Slightly loose shaft-to-housing fits are suitable for most applications, while line-to-line fits often provide the best performance. If bearings are assembled on a shaft that is too large (creating a press-fit) the inner ring may stretch slightly. When this occurs, the bearing’s radial play can be diminished or even eliminated altogether.

In addition, the integration of the bearing in the vehicle can also provide a transmission function in the case of a driven wheel (drive provided via the spline in the bore).

FrontWheel Bearing tool

* For closer running accuracy or reduced axial play K13 internal clearance may be used provided that the fit of the outer ring is line to line or looser

Wheel BearingHubAssemblyFront

NTN products are critical to keep the world moving smoothly. Our bearings and related products are present in a wide variety of industries. Please see the industries below that have applications for this product category.

Wheel bearing

NTN satisfies more than 30% of the demand for North American OE vehicle production from NTN’s Elgin, Illinois plant. The Elgin plant is the largest manufacturer of hub assemblies in North America, providing more product to OEMs and the Aftermarket than any other single facility. This gives NTN the benefit in the Aftermarket of supplying highly-engineered replacement parts that meet or exceed OE engineering specifications.

NTN has developed different types of bearings for car manufacturers, depending on the vehicle and the performance requirements. We speak about a generation of bearings, currently called “GEN”.

The advantages of GEN.2: reduction in the number of parts, improved rigidity, increase in accuracy and better adaptation to the operating conditions.

Line to Line to slightly loose shaft and housing fits are desirable for most applications. Interference fits may be necessary to prevent one bearing ring from turning relative to its mating part under heavy loads or when cycle vibration is present. An interference fit causes a 50-80% loss in radial play. The contact angle of a radial bearing under axial load is related to the radial play remaining in the bearing after installation. A higher assembled radial play means a higher contact angle. A low contact angle is desirable for pure radial loads. Higher contact angle is desirable for axial load applications. Axial play is proportional to the radial play in the bearing. One of the rings in the bearing assembly must be free to move to prevent axial pre-loading.

Frontdriver side wheel bearing andhubassembly

AUTHORIZED DISTRIBUTOR SEARCH NTN has dozens of manufacturing plants and distribution centers throughout the Americas, to keep our distribution channels fully stocked. Use our distributor locator tool to find a distributor close to you.

Miniature and instrument ball bearings are used in high-precision applications to mate parts, control movement, and provide rotational and oscillating functionality. Aircraft, medical instruments, computers, flow meters, and pick-and-place robots are just some of the challenging applications they are found in. For example, some high-speed instrument bearings travel at speeds approaching 500,000 rpm. Flow meter bearings travel at slower speeds but face a unique set of pressure, corrosion, and environmental challenges. Finally, many miniature bearings are used in pulling and stressing man-made vacuums and the natural vacuum of space.

wheel bearing是什么

3rd generation bearings incorporate two mounting functions: attachment to the chassis and the fixing to the disc brake and the rim of the wheel by the flanges incorporated into the inner and outer rings.

Wheelhubassembly

The following tables are a guide for establishing shaft and bearing fits for miniature and instrument bearings, when the expansion coefficients of the shaft and housing are similar or when the operating temperature differential between them is nominal. In other conditions, modification in fits and internal clearance may be required.

The first applications used single row bearings, mounted in pairs. Compared to this type of conventional bearing arrangement, NTN GEN 1 wheel bearings incorporates 2 rows of rolling elements which require no setting (no pre-loading or alignment).

An incremental evolution of the Gen 2 wheel hub assembly, NTN’s Gen 2.5 hub assemblies offer all of the benefits of the Gen 2 hubs, but are designed for inner ring rotation with a hub spindle installed. Engineered for driven and non-driven wheel applications, the Gen 2.5 can feature either a pressed in or roll-formed assembly.

Within the assembled mechanism, the fit of the ball bearing on its mating components is vital to maximizing bearing life. If the fit is too loose, the bearings slide around on the shaft, eliminating the advantages gained by selecting a ball bearing in the first place. If the fit is too tight, the bearing integrity may be compromised by reduction of radial play in the assembly. The perfect fit enables bearings to run at peak performance for maximized end-product life. There are three main types of shaft and housing fits. A loose fit is when the bore of the inner ring is slightly larger than the outer shaft diameter. A line-to-line assembly is when the bore of the inner ring of the bearing and the outer diameter of the shaft are the same. With a tight fit, the bore of the inner ring of the bearing is slightly smaller than the outer shaft diameter. Tight fits are also called interference or press fits, because bearings in these assemblies are pressed onto shafts.

Wheelhubbearing

Hub bearings support the weight of the vehicle and allow the tires to turn smoothly. They are extremely important as they have a major impact on safety, as well as ride comfort and fuel efficiency. As the world leader in OEM wheel hub assembly market share, NTN is dedicated to developing bearings in an aim to support the ever changing needs of the OEM’s.

** For closer running accuracy or reduced axial play K25 internal clearance may be used provided that the fit of the outer ring in the housing is line to line or looser.

wheel bearing中文

BEARING FINDER Are you looking for a specific size of bearing? Do you have an NTN or other part number to look up? Do you need a CAD file or technical specifications? Find and download the bearing information you need with NTN’s robust online product catalog tool.

In addition to the advantage of a Gen 2 hub assembly, the roll-formed versions of the Gen 2.5 have a factory set pre-load which adds to the ease and reliability of installation.

If extreme fits are undesirable or in certain applications, selective assembly of coded bores matched with similarly graded shaft and housing diameters may be utilized. This approach is usually more economical than a reduction in diameter tolerances.

The advantages of GEN.1: compact, better reliability and simpler mounting process. It is one of the most used wheel bearings.

In addition to our OE heritage, NTN also offers a line of OE-quality wheel hubs to the automotive aftermarket under the BCA Bearings product line. Learn more about BCA Bearings here BCABearings.com.

* * * Subject*Customer RelationsTechnical Engineering/Support * yes Grant permission for NTN to contact you and securely store your contact information on this site. View Privacy Policy yes Yes, sign up to receive NTN Insider, the monthly newsletter with various tips, product info and announcements from NTN experts.

To meet the need for greater simplicity and reduce weight, expected by manufacturers, NTN offers a range of bearings where the inner and outer rings incorporate additional mounting functions: clamps, flanges or mounting holes for easy mounting onto the chassis of the vehicle.