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what is the oil seal and what is the difference between TC oil seal ,TB oil seal ,TA oil seal ?

what is the oil seal and what is the difference between TC oil seal ,TB oil seal ,TA oil seal ?

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what is the oil seal  and  what  is the difference between TC  oil seal  ,TB oil seal  ,TA oil seal  ?

Oil seal, also known as sealing ring or shaft seal, is a sealing element used on mechanical equipment. Its main function is to prevent the leakage of liquid or lubricating oil between the rotating shaft and fixed components, while also preventing external impurities such as dust and particles from entering the interior of mechanical equipment. Oil seals are usually made of elastic materials, such as rubber, polyurethane, etc., with a circular shape and elastic lip edges inside. It is tightly attached to the rotating shaft, forming a closed environment, effectively reducing the leakage of liquid or lubricating oil and internal pollution of mechanical equipment.


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  • TC  is the representation method for new national standards.

Japan, Taiwan, and other places. FB is the representation method of the old national standard, with the same structure and content. Similarly, many European standards use AS to represent TC and FB oil seals. The standards for FB and FC are GB10708.3-189.  TC is the representation method for new national standards, Japan, Taiwan, and other places. TC oil seal is a mechanical component used to seal oil (oil is the most common liquid substance in transmission systems, also commonly referred to as a general liquid substance).

(1). FB is the representation method of the old national standard, with the same structure and content.

(2). Many internal standards in Europe use AS oil seal  to represent TC and FB oil seals.

Oil seals are widely used in various industrial fields, especially in mechanical equipment such as hydraulic systems, engines, pumps, gearboxes, transmission devices, and automobiles. They help maintain the normal operation of mechanical equipment, extend the service life of the equipment, reduce maintenance costs, and ensure the efficient performance of the equipment.

The design and selection of oil seals must consider multiple factors, including working environment, liquid type, temperature range, pressure requirements, speed requirements, etc. Different types of oil seals are suitable for different application scenarios. Common types of oil seals include rotary shaft seals, piston seals, static seals, etc. Oil seals usually have inner and outer lips, with the inner lip tightly against the rotating shaft and the outer lip tightly against the fixed components. This creates a sealing effect due to the friction between the inner and outer lips during the operation of the rotating shaft.

In summary, oil seals play a crucial role in fields such as engineering machinery, automobiles, and industrial equipment, ensuring the normal operation of mechanical equipment, preventing liquid leakage and external impurities from entering, thereby ensuring the stability, safety, and efficient performance of the equipment.

 

1. Oil seal representation method

Common representation methods:

Oil seal type - inner diameter - outer diameter - height - material

For example, TC40 * 62 * 12-NBR represents a double lip inner skeleton oil seal with an inner diameter of 40, an outer diameter of 62, a thickness of 12, and a material of nitrile rubbe

2.Material of  oil seal

Nitrile rubber (NBR): wear-resistant, oil resistant (cannot be used in polar media), temperature resistance: -40~120 ℃.

Hydrogenated nitrile rubber (HNBR): Wear resistance, oil resistance, aging resistance, temperature resistance: -40~200 ℃ (stronger than NBR temperature resistance).

Fluorine adhesive (FKM): acid and alkali resistant, oil resistant (all oil resistant), temperature resistant: -20~300 ℃ (oil resistance is better than the above two).

Polyurethane rubber (TPU): Wear resistance, aging resistance, temperature resistance: -20~250 ℃ (excellent aging resistance).

Silicone rubber (PMQ): heat resistant, cold resistant, small compression set, low mechanical strength, temperature resistance: -60~250 ℃ (excellent temperature resistance).

Polytetrafluoroethylene (PTFE): Good chemical stability, resistance to various media such as acid and alkali, oil, wear resistance, high temperature resistance, high mechanical strength, and good self-lubrication.

Generally speaking, the materials commonly used for skeleton oil seals are nitrile rubber, fluororubber, silicone rubber, and polytetrafluoroethylene. Due to its good self-lubrication, especially when added with bronze, they have better effects, and are all used to make retaining rings, Gly rings, and Stuart seals

Distinguish the model of the skeleton oil seal

The C-type skeleton oil seal can be divided into five types: SC type, TC type, VC type, KC type, and DC type. They are single lip inner skeleton oil seal, double lip inner skeleton oil seal, single lip spring free inner skeleton oil seal, double lip spring free inner skeleton oil seal, and double lip spring free inner skeleton oil seal. (We recommend you pay attention to the "Mechanical Engineer" official account to grasp dry goods knowledge and industry information at the first time)

The G-type skeleton oil seal has a threaded shape on the outside, similar to the C-type. It is only modified to have a threaded shape on the outside in terms of technology, similar to the function of an O-ring, which not only strengthens the sealing effect but also fixes the oil seal without loosening.

The B-type skeleton oil seal has adhesive on the inner side of the skeleton or there is no adhesive on both sides of the skeleton. The absence of adhesive will improve heat dissipation performance.

The A-type skeleton oil seal is a prefabricated oil seal with a relatively complex structure compared to the above three types, characterized by better and superior pressure performance.

 

3.They all have different forms of oil seals and are referred to as general purpose oil seals as follows: