First, the oil seal is used to seal the mechanical axis of the shaft seal oil seal components, and the cavity is basically static (see below), so the oil seal, also known as rotary shaft lip ring.
The friction parts of the machinery are used to prevent oil and chemical liquids 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 should also use the oil seal seal state, one oil seal between the outer edge and the cavity for the static seal, while ensuring the outer edge of the seal in the cavity between the reliable positioning. Second, the sealing seal between the seal and the shaft seal state, Oil Seals when the shaft rotation for the dynamic seal, when the shaft is static when the static seal. The combination of various factors and their interaction, Oil Seals the sealing performance and service life of the oil seal had a great impact.
Second, the main use of oil seal for the engine crankshaft and camshaft seal cars, motorcycles and commercial vehicles and other transmission systems (such as gear boxes, wheels, axle, differential) seal forklift, Oil Seals excavators and other agricultural machinery And construction machinery Transmission system Seal Industrial gearbox Seal of hydraulic components (pumps, motors) Seal of household machinery Washing machine seals are widely used in mechanical engineering and equipment processing industry
Third, the main features of the oil seal The external seal for the cavity to ensure that the static seal on the cavity - the use of the outer edge of the rubber frame of the rubber outer edge; Oil Seals the use of exposed metal skeleton of the outer edge, most need to polish and plating anti-corrosion coating. The spring-loaded seal lip ensures the reliability of the dynamic and static sealing of the shaft. After the long-term development of the results of the study, the seal of the seal lip structure to improve the performance to improve the reliability of the seal within a wider load range to add dust lips, or in a special case using a number of dust lips, Oil Seals To prevent external pollutants and dust intrusion.
Fourth, 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, edge and sealing lip and so on.
Sealed seal lip structure to improve the performance, and thus improve the reliability of the seal within a wider load range to add dust lips, or in special circumstances to use a number of dust lips, to prevent external pollutants and dust Invasion.
Fifth, 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, edge and sealing lip and so on. Key names and terms of various parts of the inner seal of the inner seal with spring and with a dust seal. 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 inner diameter than the shaft diameter is small, that has a certain "interference". Therefore, when the oil seal into the oil seal and the shaft, the pressure of the oil seal and the tightening force of the self-tightening coil spring to produce a certain radial force on the shaft, after a period of time to run, the pressure will quickly reduce or even disappear , Oil Seals The spring can be compensated at any time with the oil seal from the force, the outer edge of the oil seal so that the oil seal in the cavity hole at the same time, to prevent the fluid from the outer surface of the oil seal and the surface of the contact surface between the leakage and invasion of the role. Another metal skeleton is when the oil seal is fixed in the cavity, from the role of maintaining the force. The sealing lip is a flexible elastomer designed to maintain a stable sealing effect under the influence of mechanical vibration and pressure changes in the sealed fluid and to maintain a stable contact between the lip and the shaft surface. The spring can increase the compression force of the seal lip to the shaft, thereby maintaining the effect of this pressing force. The lip end portion is formed in a wedge shape and presses the shaft surface at the end portion to function as a sealing fluid.
Sealing mechanism of the oil seal involves two factors, Oil Seals one is the sealing of the cavity, mainly the outer edge of the oil seal (static part) in the cavity of the positioning; Second, the lip and the rotating shaft surface contact with the dynamic seal, which is oil seal The most important function
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 within the hole. Generally rubber material coated metal skeleton, the rubber elastic body of the reliable static sealing ability