Home > News > Content

Sealing Reliability Of Oil Seals

Oct 30, 2017

Oil seal is used to seal the mechanical equipment in the rotary shaft seal oil seal components, and the cavity is basically static, so the oil seal, also known as rotary shaft lip ring.

The friction parts of the machinery are used to prevent oil and chemical leachings from leaking from the outside, in addition to the oil, in order to prevent the oil from leaking from the mechanical gap due to oil entry during mechanical operation. Time to use the oil seal

The main purpose of the oil seal

Used for engine crankshafts and camshafts Sealed forklifts such as cars, motorcycles and commercial vehicles, such as gearboxes, wheels, axles, differentials, and other agricultural machinery and construction machinery transmission systems Sealed industrial gearbox seals Hydraulic components (pumps, motors) Seals sealed with household mechanical washing machines, widely used in mechanical engineering and equipment processing industry.

Main features of oil seal

The outer part of the oil seal is used to ensure the static seal of the cavity - the rubber outer edge of the inner metal frame; Oil Seals the outer edge of the exposed metal skeleton is mostly polished and coated with anti-corrosion coating. A spring-loaded seal lip ensures the reliability of the dynamic and static seal of the shaft. After a long-term development study, the seal seal structure of the oil seal improves to excellent performance and improves the reliability of the seal over a wider load range

The role of various parts of the oil seal

Oil seal mainly by the sealing body, strengthen the skeleton and self-tightening coil spring and other parts. Seal in accordance with different parts are divided into the bottom, waist, Oil Seals edge and sealing lip and so on. The following figure is: with the spring and with a dust cover of the inner bag of the various parts of the oil seal the main names and terms.

The metal skeleton acts as a reinforcing bar in a concrete component and acts as a reinforcement and keeps the oil seal in shape and tension. Usually, in the free state of the skeleton oil seal, Oil Seals its diameter smaller than the shaft diameter, that is, with a certain "interference." Therefore, when the oil seal is inserted into the oil seal seat and the shaft, the pressure of the oil seal edge and the shrinkage force of the self-tightening coil spring produce a certain radial force on the shaft, and after a period of operation, the pressure will decrease or even disappear , Therefore, with the spring can be compensated at any time oil seal from the force.

The outer edge of the oil seal prevents the oil from leaking and invading between the outer circumferential surface of the oil seal and the contact surface of the inner surface of the cavity while the oil seal is fixed in the cavity hole. In addition the metal skeleton is when the oil seal is fixed in the cavity, Oil Seals from the role of maintaining the force.

The outer edge of the oil seal is easy to assemble in order to ensure a static seal of the oil seal in the cavity and a stable positioning in the hole. Generally rubber material coated metal skeleton, the rubber elastic body of the reliable static sealing capacity and metal skeleton support the advantages of integration into one. The outer edge of the oil seal is chamfered to facilitate assembly. Another oil seal on the outer edge of the design of the groove can increase the adhesion to avoid the oil seal back and the risk of skew, Oil Seals but also increased the pressure with the tolerance, can improve the reliability of oil seal static seal. Outside the design of the metal outer skeleton of the oil seal is suitable for the installation of the cavity in the installation of particularly strong and accurate occasions, it should be noted that when the oil seal hole surface should be coated with a sealant, sealing seat can be used sealant The

Seals and springs are made of metal, sealed lip and other major parts of the rubber. Oil seal according to the use of the environment, you can use different rubber production to meet the sealing performance and requirements. The most commonly used oil-resistant rubber is nitrile rubber, nitrile rubber for the current oil seal and O-ring use one of the most common rubber. Can be said to be the most widely used, the lowest cost rubber seals. Manufacture of oil seals are commonly used in polypropylene rubber, silicone rubber, fluorine rubber and polytetrafluoroethylene and so on.

Oil seals commonly known as retaining oil ring, is the car to keep rotating parts essential non-metallic parts. Commonly used skeleton oil seal generally consists of metal skeleton ring, Oil Seals wire coil and rubber seal layer part.

The role of oil seal:

1. To prevent sediment, dust, moisture and other intrusion into the bearing;

2. Limit the leakage of lubricating oil in the bearing.