Bearing seal typesZZ RS

Nothing works without lubrication: Every bearing runs with grease or oil lubrication, which is the basic prerequisite for avoiding metallic contact of the bearing components,

All seals listed in the table are examples of contact seals, but are also external seals. In the case of external seals, the shaft should be ground free of twists in the contact area of the seal in order to prevent lubricant from being ejected from the bearing.

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Unlike integrated seals, external seals are not integrated into the rolling bearing and must be added separately. They can be divided into two types, namely non-contact seals and contact seals.

Characteristics of deep groove ball bearings In its current form, the deep groove ball bearing has existed – subject to some optimisation – for about

Integrated seals are integrated into the rolling bearing and pressed into the inner or outer ring. Integrated seals are mainly used in deep groove ball bearings. External seals, on the other hand, must be planned during the design phase. They are used in bearing types where no integrated seal is provided (mainly in roller bearings) or if an integrated seal is not sufficient and the bearing still needs additional protection. The functions of integrated and external seals are identical.

Seals are to prevent lubricant from escaping from the rolling bearing Seals should prevent ingress of contaminants When choosing the seal, aspects such as the type of lubricant and the circumferential speed of the bearing rings must be taken into account There are two seal variants: Integrated and external seals The external seals can be divided into non-contact seals and contact seals Non-contact seals are suitable for high-speed applications Contact seals have a sealing lip made of rubber and have greater sealing capacity as well as a higher frictional torque

All contact seals should have a relief hole to ensure pressure equalisation between the bearing and the bearing environment at all times. This must be placed in such a way that there is no excess pressure in the housing that could result in lubricant leakage. The choice of relief hole should take into account the mounting position of the drive unit to prevent lubricant leakage. During the painting process, it must be ensured that the relief hole is not closed unintentionally. With regard to the radial shaft seal, the permissible circumferential speed for the seal lip should be observed. Furthermore, the installation direction of the rotary shaft seal determines its function. The rotary shaft seal can either prevent ingress of contaminants or the escape of lubricant.

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Bearing seal typesSKF

There are manufacturers who have specialised in producing different sealing concepts. This means that there are seals made of various materials (including metal and plastic) and in a wide range of variants that have individual properties in terms of thermal variability and sealing performance.

Certain factors should be taken into account when choosing a seal. These include the type of lubricant, the circumferential speed at the seal lip, fitting errors of the shaft, spatial limitations, the seal friction and the associated temperature increase. The seal material also plays an important role in the choice of seal. Of course, the costs incurred must also be considered.

Bearing seal typeschart

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The most important feature of non-contact seals is that in this variant there is a small gap, or labyrinth, between the seal and the rotating part. Seals of this type are suitable for high-speed applications as there is no high seal friction. In addition, oil or grease is usually applied to any remaining gaps to provide improved sealing capability.

Bearing Sealsize chart

In general, lubrication (oil or grease) between the contact point of the sealing lip and the inner or outer ring of the bearing is indispensable. In the case of oil lubrication, suitable sealing concepts are required that prevent oil leakage during operation. In addition, the most important seal designs, their properties and other criteria for choosing the right seal can be found in the following tables.

During the design of a bearing assembly, the topic of sealing will always accompany you. In the following material, we will cover both integrated and external sealing concepts. Both are used to prevent lubricant from escaping and to prevent contaminants (such as dust and water) from entering the rolling bearing.

Ballbearing seal types

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Seals are to prevent lubricant from escaping from the rolling bearing Seals should prevent ingress of contaminants When choosing the seal, aspects such as the type of lubricant and the circumferential speed of the bearing rings must be taken into account There are two seal variants: Integrated and external seals The external seals can be divided into non-contact seals and contact seals Non-contact seals are suitable for high-speed applications Contact seals have a sealing lip made of rubber and have greater sealing capacity as well as a higher frictional torque

Non contactseal bearing

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If you have read our article on rolling bearing basics, you probably already know that rolling bearings can basically be divided into two types –

Generally speaking, a bearing is only as good as its environment. Who can perform at their best if they don’t feel comfortable in their surroundings?

Characteristics of bearing inserts The bearing insert, which in principle is constructed like a deep groove ball bearing, has a spherical outer ring surface. The

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Bearing seal typespdf

Interference fit, transition fit, clearance fit. You should know and be able to define these three types of fit after reading this article. But before

Contact seals are seals with a moulded sealing lip made of synthetic rubber that seals against the shaft, housing, inner ring or outer ring. The rubber is vulcanised onto a sheet metal plate. The big advantage of contact seals compared to non-contact seals is their sealing capacity, which is significantly greater. Nevertheless, aspects such as the frictional torque and the temperature increase are also considerably higher with contact seals. Because the sealing lip of the contact seals rubs against the shaft, the permissible circumferential speed depends on the seal type. In addition, the sealing lip must be lightly pre-greased before assembly so that it does not run dry or wear out during the first few minutes of use.

Bearing sealmaterial

While the gap seal is considered the simplest seal variant, the labyrinth seal can be considered the most important non-contact seal type. It offers maximum flexibility in manufacturing as well as a very good sealing performance and is also an inexpensive solution when choosing a seal. As is typical for these non-contact seals, labyrinth seals can be operated almost at the limiting speed of the rolling bearing, depending on the design. There are three main types of labyrinth seals, including an axial, a radial and a self-adjusting version. Self-adjusting labyrinth seals are used, for example, in bearing housings.

The integrated seals can be divided into different types, some of which are defined in more detail in this section. All seals listed below are used for dust protection and sealing on both sides. The main integrated seals of rolling bearing manufacturer NTN are the seals ZZ, LLB, LLU and LLH (with low frictional torque).

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