Engineering machinery rubber oil seals are sealing components used in engineering machinery to prevent the leakage of lubricants and hydraulic oils, and to block the intrusion of external impurities into the equipment.
Here is a detailed introduction:
Structural Composition
Rubber Body: The core part of the oil seal, typically made from rubber materials with good oil resistance, heat resistance, and wear resistance, such as Nitrile Rubber (NBR), Fluorocarbon Rubber (FKM), etc., possessing elasticity and sealing properties.
Steel Skeleton: Located on the inner or outer diameter of the oil seal, used to support the rubber body, enhance the rigidity and installation stability of the oil seal, and can be in the form of metal rings, springs, etc.Sealing Lip: The critical part of the oil seal, shaped like a lip, tightly adheres to the surface of the rotating shaft or stationary component, forming a sealing surface to prevent liquid leakage.
Dust Lip: Some oil seals are equipped with a dust lip to prevent external dust and impurities from entering the interior of the equipment.
Lubrication Groove: Some oil seals have a lubrication groove behind the sealing lip to evenly distribute lubricating oil, reduce friction, and extend the service life of the oil seal.
Working Principle
Relies on the elastic deformation of the rubber body to ensure the sealing lip closely fits the surface of the rotating shaft or stationary component, forming a thin sealing layer.During equipment operation, internal pressure causes the sealing lip to adhere more tightly to the shaft surface, enhancing the sealing effect, while the lubrication groove maintains an oil film, reducing friction and wear.
Material Selection
Nitrile Rubber (NBR): Exhibits excellent oil resistance, wear resistance, and low-temperature resistance, suitable for general engineering machinery hydraulic and transmission systems, capable of operating within a temperature range of -40℃ to 100℃.Fluororubber (FKM): Exhibits excellent heat resistance, chemical resistance, and aging resistance, maintaining elasticity over a wide temperature range from -20°C to 200°C. It is suitable for engineering machinery in high-temperature and highly corrosive environments, such as the high-temperature hydraulic systems of excavators.
Polyurethane (PU): Possesses high strength, high wear resistance, and good oil resistance, making it suitable for high-pressure and high-speed engineering machinery applications, such as the hydraulic pumps of cranes.Main Types
Radial Shaft Seals: Also known as lip seals or grease seals, they are the most common type, used to seal the space between a rotating shaft and a stationary housing, capable of accommodating shaft runout and eccentricity.
Axial Shaft Seals: Also referred to as face seals, they are used to seal the surfaces between two relatively moving planes, commonly found in pumps, gearboxes, and hydraulic cylinders.
Wiper Seals: Used to prevent dust and dirt from entering machinery or equipment, typically used in conjunction with radial shaft seals and axial shaft seals.Installation and Maintenance
Installation: Before installation, ensure that the shaft and mounting surface are smooth and free of burrs. Clean the installation area and apply an appropriate amount of lubricant to the lip of the oil seal and the shaft surface. Avoid twisting or deforming the oil seal during installation, and use specialized tools for installation.
Maintenance: Regularly inspect the oil seal for wear, aging, and sealing performance, and replace damaged or aged oil seals promptly. Keep the oil seal surface clean and regularly remove dust and oil stains. Avoid contact of the oil seal with chemicals such as acids and alkalis.
Original text from: pneumatic seal https://www.bszzseal.com/
