Auto Transmission NBR Seals

Linde Polymer Tec Co.,Ltd. is one of the most experienced manufacturers and suppliers of auto transmission nbr seals in China, also supports customized service. Please feel free to buy high quality auto transmission nbr seals for sale here from our factory.

 

 

what is Auto Transmission NBR seals

 

It is quite common to use NBR (nitrile butadiene rubber) seals in automobile automatic transmissions. NBR rubber has excellent grease resistance, mechanical strength, and wear resistance, making it an ideal choice in many automotive drivetrains.

 

In automotive automatic transmissions, NBR seals are commonly used in the following locations:

 

1. Oil seal: NBR oil seal is widely used in key parts such as the input shaft, output shaft, and hydraulic system of automatic transmission. These oil seals lubricating and hydraulic oil, preventing leaks and keeping the system functioning properly.
2. O-rings: NBR O-rings are commonly used in connection parts such as hydraulic control valve bodies, sensors, and joints of automatic transmissions. They provide a reliable seal against leakage of liquids and gases.
3. Vacuum tube seals: In automatic transmissions, certain systems (such as the brake booster) may require the use of vacuum tubes. NBR seals are used to ensure that the connections of vacuum pipes are well-sealed to maintain normal operation of the system.

 

The advantages of NBR seals include excellent resistance to grease, abrasion, and high temperatures (typically around 100 °C). These characteristics enable NBR seals to provide reliable sealing performance and maintain long service life in the harsh working environment of automotive automatic transmissions.

 

However, it is important to note that specific automatic transmission designs and manufacturer requirements may result in the use of other types of seal materials in some cases.

Technical data

 

Physical properties
Property		Test standard	Value	Unit
Hardness		ASTM D2240	73＋/-5	Shore A
Elongation at break		ASTM D412	297	%
Tensile strength		ASTM D412	19.2	Mpa
100% Modulus		ASTM D412	4.5	Mpa
Compression set-24 hours at 100 ℃ Slab		ASTM D395	9.1	%
Ageing properties
Property		Test standard	Value	Unit
Heating ageing-72 hours at 100 ℃		ASTM D573
Hardness change			1.95	Shore A
Elongation at break change			-21	%
Tensile strength change			-7	%
Volume change			0	%
Aging water-166hours at 100 ℃		ASTM D471
Hardness change			-1.95	Shore A
Elongation at break change			-10	%
Tensile strength change			-10	%
Volume change			4.35	%

 

 

Auto Transmission NBR seals

 

The following are some common performance introductions

 

Physical properties

 

• Density: The density of NBR rubber is usually between 1.0-1.2 g/cm³, with moderate weight and volume characteristics.
• Modulus of elasticity: NBR has a high modulus of elasticity, allowing it to provide good sealing properties and elastic recovery in transmission applications.

 

Chemical properties

 

• Grease resistance: NBR rubber has exceptional grease resistance and can maintain exceptional performance in environments where it is exposed to lubricating and hydraulic oils in the transmission.
• Chemical Resistance: NBR has good resistance to general industrial chemicals and fuels, but may suffer from certain chemicals such as ketones and ester solvents.

 

Mechanical behavior

 

• Wear resistance: NBR rubber has good wear resistance and can withstand the requirements of high-speed rotation and friction in the transmission.
• Strength and toughness: NBR has high mechanical strength and toughness, allowing it to maintain its shape and performance under the extrusion and deformation conditions of the transmission.

 

Processing performance

 

• Plasticity: NBR rubber has good plasticity and can be manufactured into seals of various shapes and sizes through extrusion, compression molding, and injection molding.
• Adhesion: NBR rubber has good adhesion to metals and other materials, ensuring a good connection between the seal and surrounding components.

 

Overall, NBR seals have good physical, chemical, and mechanical properties in automotive automatic transmissions, as well as good processing properties. They provide reliable sealing, durability, and grease resistance to meet transmission requirements.

 

 

 

Customized and standard-size items

 

Custom Made: Custom NBR seals are designed and manufactured to specific requirements and application needs. These custom pieces can be adapted to fit the size, shape, and functional requirements of a specific vehicle's transmission. Manufacturers, Linde Polymer often works closely with the vehicle manufacturer or equipment manufacturer to produce custom seals based on their specific design and specification requirements.

 

Standard size items: Standard size NBR seals are produced to industry standard specifications and typically come in common sizes and shapes. These standard-size items can be more widely applied to different types and brands of automotive transmissions. Known for their versatility and accessibility, they are typically widely adopted.

 

Dimensions and nomenclature: The DIN 3761 standard specifies the dimensions and nomenclature of oil seals, including parameters such as inner diameter, outer diameter, and thickness. Standardization of these parameters helps ensure that oil seals are correctly adapted to the specific dimensional requirements of automotive automatic transmissions.

 

Material Requirements: Standards often specify material requirements for oil seals to ensure their durability and performance in automotive automatic transmission environments. For NBR (nitrile rubber) oil seals, standards may stipulate requirements for material hardness, oil resistance, wear resistance, and temperature resistance.

 

Sealing performance: The DIN 3761 standard may also stipulate the sealing performance requirements for oil seals in automotive automatic transmissions. This includes the control of leaks of fluids or lubricants and the requirement to prevent external contaminants from entering the transmission.

 

 

 

 

 

 

 

 

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