Oil Seals - Everything you need to know about

Shaft seals, dirt seals, grease seals, lip seals, and numerous other names describe oil seals. These simple components used in rotary shaft machinery prevent oil from leaking and keep impurities like dust, dirt, and water out. Their primary role is to protect all types of bearings, such as ball, sleeve, and roller bearings, in rotating shafts. Moreover, oil seals prevent the mixing of two fluids that should not blend, like water and oil.

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Understanding Oil Seals

An oil seal, a mechanical component, prevents lubricant from leaking out of machinery. It achieves this by sealing the moving and stationary parts of the equipment. Additionally, it blocks contaminants from entering the machine, thereby extending its lifespan.

There are various types of oil seals: PTFE lip oil seals, rubber fabric oil seals, and rotating V-seals.

An oil seal kit includes oil seals of necessary dimensions and characteristics. It is more cost-effective and practical compared to purchasing individual oil seals.

Types of Oil Seals Offered by NBC

Oil seals, also known as grease and oil seals, flexible lip seals, radial lip seals, or rotating shaft seals, come in several configurations: single lip, double lip, triple lip, and multiple lips.

Double Dust Lip Seal

The Double Dust Lip (DDL) seal features a garter spring design. It includes two dust lips and a fluid lip with a garter spring to maintain a firm hold on the wear ring. Despite the evolution in bearing seal designs, this seal remains a staple, especially in the freight industry for over 50 years, by keeping contaminants and grease out. However, the garter spring adds torque and temperature to the bearing.

Efficiency Plus Bearing Seals

The Efficiency Plus (EP) seal, designed with poly inserts and rotors, eliminates the fluid lip, resulting in reduced torque value of fewer than 15 in-lbs. It features a triple dust lip, and replaces the fluid lip with a labyrinth-like insert and rotor interlock. This design ensures excellent grease retention while lowering the torque needed to rotate the seal.

Other Types of Oil and Grease Seals Include:

• Single lip oil seal
• Metal cased
• All rubber or polymers
• Internal orientation
• External orientation
• Axial orientation
• Spring-energized

Purpose of Oil Seals

• To serve as a physical barrier that retains lubricant within the designated area.
• To prevent the lubricating oil from leaking out despite high pressure.
• To act as a barrier to keep debris, contaminants, and other external elements out of the lubricating system.

Why Bearing Seals Are Important

Sealed bearings are preferred over unsealed alternatives. The advantages of sealed ball bearings include worry-free lubrication, no contact, and self-containment.

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What Are Bearing Isolators?

Bearing isolators are dynamic seals used to protect bearings from external impurities. These include rotating (rotor) and stationary (stator) components. Some use O-rings or solid seals, while others are designed like labyrinths.

Different Types of Bearing Seals

Good bearing seals are essential for many bearings. They perform dual functions: preventing lubricant leaks and blocking impurities from entering. Selecting the right seal for your bearings is crucial to their lifespan and performance. Different types include:

• Contact seals
• No-contact seals
• Labyrinth seals

Select the Right Seal for Your Bearing with NBC

Several factors like maximum temperatures, required lubricants, and available space influence your choice of bearing seal. These factors affect the type of bearing suitable for your application, the amount of material needed, and more.

Though choosing the right seals is crucial, our experts at NBC bearings can help. We work with you to identify the bearings and bearing seals that offer the best, most affordable solution for your application, environment, and finished product.

The Importance of Quality Oil Seals for Transmission Rebuilds

Modern transmissions work hard, so their oil seals should do the same. Inferior seals often cause transmission fluid leaks that can damage the unit beyond repair. For those rebuilding transmissions daily, it's easy to overlook the importance of these small parts. However, in a high-demand system, the value of well-made oil seals is immense. This post discusses why choosing quality transmission oil seals is vital.

Causes and Effects of Transmission Seal Leaks

A single transmission contains dozens of sealing components. If one fails, the vehicle can begin leaking transmission fluid, leading to numerous problems including total transmission burnout. Oil seals prevent lubricant leaks by sealing the spaces between a transmission's parts and block contaminants from clogging the unit. Over time, seals degrade due to pressure, stress, and heat, but the quality can significantly impact their lifespan. Seals for more active components like input and output shafts wear faster and are tougher to service without dismantling the unit. Detection is challenging until a seal fails.

Proper maintenance and lubrication can extend an oil seal's longevity, but performance heavily depends on the seal's overall quality. Poorly made seals can't handle modern transmission pressure fluctuations and lead to more leaks and issues. Hence, choosing high-quality oil seals when rebuilding transmissions is crucial.

Quality Seals Under Pressure

Quality oil seals have key indicators: material and OE inclusion. Innovative materials like polyacrylate, ethylene acrylic, hydrogenated nitrile, and fluoroelastomers offer better durability than cheap rubber seals. OE seals, used by the original transmission manufacturer, provide the best performance and fit.

No oil seal lasts forever, but the quality affects the success of rebuilds and the value of your work over time. Using high-quality seals capable of enduring today's transmission demands increases long-term productivity.

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