High sealing performance or contact seals cause a relatively greater increase in friction, and low-friction seals or non contact seals have lower sealing performance.

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A wheel bearing is a component of the rear and front wheel hubs. In the front of the vehicle, the hub attaches the wheel to the steering knuckle of the suspension. The wheel is connected to the hub, and the hub spins effortlessly inside the wheel bearing. This enables the weight of the vehicle to rest on the hub while it spins as it maintains as minimal surface contact as possible.

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NSK  has developed a seal it claims is both high in sealing performance and provides low friction. For most manufacturers this would be difficult as you may have one of these features at the expense of the other.

Bearings are used in a wide range of applications each in their own unique environment. Contaminants like water or dust, and foreign matter can easily enter an unprotected bearing. Bearings without a sealing device can fail dramatically and quickly. Bearing operation will be adversely affected as heat increases and lubricant deteriorates.

Vehicles that have conventional, tapering wheel bearings need have them serviced every 25,000 to 30,000 miles — replacement might not be necessary as long as they’re regularly maintained.

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Selecting an appropriate bearing seal demands a proper assessment of the operational environment. The operating speed, denoted often by angular velocity, plays a role in determining heat generation and potential wear rates. The type and viscosity of the lubricant, combined with the expected bearing load (both radial and axial), directly influence the seal’s efficiency and longevity. Furthermore, bearing dimensions, particularly the bore diameter and width, are essential for ensuring a perfect fit and avoiding potential leak paths.

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Labor costs estimates are between $137 and $173 while parts cost between $246 and $325. Estimate doesn’t include taxes and fees.

The short answer is yes, but not as long as you would like. As the wear advances, so does the chance of damage happening to other components of the suspension.

The vehicle’s wheel bearing gets lubricated with grease for it to further decrease friction. A lot of vehicles have sealed wheel bearings that encase the ball bearings and the grease.

The first barrier is an external housing seal, the second barrier is the grease fill captured in the housing, and the third barrier is the integral bearing seal. For highly  contaminated environments, the SKF 3 barrier sealing solution will significantly extend bearing service life.

Non-contact seals and shields have a very small clearance between the inner ring and the enclosure being either a seal or shield. In the case of non contact seals or shields friction is negligible to non-existent. This type of seal is very suitable for high speeds.

On average, wheel bearing replacement costs about $441 in the US, wheel bearing replacement costs can range from $383 to $498 according to RepairPal.com, and other sources.

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As a rule, bearing seals have two main functions which are to prevent lubricating oil or grease from leaking out and to prevent dust, water and other contaminants from entering the bearing.

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Our dedicated team of ASE Master Technicians will replace your wheel bearings in your vehicle quickly, and within your budget.  You can schedule your wheel bearing replacement with Bridwell Automotive Center by using our contact form. Stop by our Automotive Repair Shop in Scottsdale located at 7171 E Lincoln Dr. Scottsdale, Arizona 85253 or by giving Bridwell Automotive Center a call today at (480) 948-4781.

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Wheel bearings are a set of steel ball bearings that are kept together by a metal ring that enables the wheels of a vehicle to spin as effortlessly as possible.

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Bearings need to have adequate lubrication to prevent metal to metal contact between the rolling elements, raceways and cages. Proper lubrication prevents wear and helps protect the bearing from corrosion. Sealed bearings with shields or seals filled with grease are the most commonly specified and widely used in numerous applications. Grease has the advantage over oil due to better retention in the bearing. Full contact sealed bearings are referred to as lubricated for life and therefore maintenance free. Sealed or shielded bearings for normal, and medium loads are highly produced and therefore have low production costs. Common applications for standard sealed 600 and 6200 series bearings include electric motors, drills, pumps and fans.

If you believe that a wheel bearing is starting to wear, have a trained mechanic evaluate the issue as sooner than later. A vehicle with a considerably worn wheel bearing should not be driven. When the wheel bearing totally fails, the wheel could potentially come off the vehicle and cause an accident.

Sealed bearings can have many different designs and features, which are important to the optimal performance in mechanical systems. Engineers equipped with an in-depth understanding of various seal options can make informed decisions tailored to specific applications. The proper selection will result in longer bearing life and prolong the operational efficiency of the bearing assemblies.

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Additional considerations include seal peripheral speed, shaft fitting errors, space limitations, seal friction and resultant heat increase, and cost.

Shown on the left NSK developed the new low friction yet high sealing performance seal. Normally as I stated earlier a high sealing performance seal causes more  friction due to its high contact. Low-friction seals have lower sealing performance due to its lighter contact. Now NSK offers an option for customers to get both an effective seal but not at the expense of increased friction.

Contact seals have a lip which fully contacts the inner ring where the pressure of the synthetic rubber acts as a barrier for grease retention and the prevention of particles entering the bearing сontact seals can be considered superior to non-contact seals in sealing efficiency, although their friction torque and temperature rise coefficients will be higher. Also when the lip portion of a contact seal rotates contacting the inner ring, the allowable seal peripheral speed will vary. Keep in mind that lubrication is necessary at the contact surface between the lip part of the contact seal and the inner ring. Ordinary bearing lubricant can be used for this purpose.

Sealing a bearing can be accomplished with seals or shields. Seals unlike shields come in a variety of materials and types. Shields are manufactured from metal and are non-contacting whereas seals are shields with a rubber bonded to its outer surface. Seals can be manufactured as full, light or slight or no contact and may have a variety of customized features depending upon the manufacturer.

Types of designations for shields are Z and ZZ  where in this case a metal shield plate is affixed to the outside ring. For common seal designations you will find in many catalogs RS, 2RS, LB, LLB, LU and LLU. For sealed bearings the Inner ring incorporates a V-groove and labyrinth clearance. The outer ring incorporates synthetic rubber molded to a steel plate where the seal edge contacts the V-groove along the inner ring surface. LLU and and contact 2RS seals are excellent for dust proofing and very good for water proofing.

Standard ball bearing seal types shown below. Other types or similarly designed seals may be used in housings and roller bearings.

What are the seals characteristics and how are they important to bearing and sealing performance? What impact does the seal have on the amount of friction created? Generally sealing devices for rolling bearings fall into two main classifications: non-contact seals and contact seals.

In a lot of vehicles, the bearings are sealed and don’t need to be maintained. Because the bearings are sealed, they could last up to 100,000 miles or more, and will require replacing once they fail.