Skeleton oil seal
The skeleton oil seal structure has three parts: an oil seal body, a reinforcing skeleton and a self-tightening coil spring. According to different parts, the sealing body is divided into the bottom and the waist skeleton oil seal structure. The structure oil seal structure has three parts: oil seal body, reinforcing skeleton and self-tightening coil spring. The sealing body is divided into the bottom and the waist skeleton oil seal structure according to different parts.
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Parts, cutting edges and sealing lips. Generally, the skeleton oil seal in the free state has a smaller inner diameter than the shaft diameter, that is, has a certain "interference".
Therefore, after the oil is encapsulated in the oil seal seat and the shaft, the pressure of the oil seal cutting edge and the contraction force of the self-tightening coil spring generate a certain radial tightening force on the shaft, and after a period of operation, the pressure will rapidly decrease or even disappear. Therefore, the spring can compensate the oil seal self-tightening force at any time.
Sealing principle Sealing principle: Since there is an oil film controlled by the oil seal edge between the oil seal and the shaft, the oil film has fluid lubrication characteristics. Liquid surface tension skeleton oil seal
Under the action of the oil film, the stiffness of the oil film just forms a crescent surface at the contact end of the oil film, preventing the leakage of the working medium and thus the sealing of the rotating shaft. The sealing ability of the oil seal depends on the thickness of the oil film on the sealing surface. If the thickness is too large, the oil seal leaks; if the thickness is too small, dry friction may occur, causing oil seal and shaft wear; if there is no oil film between the seal lip and the shaft, it is easy to cause heat and wear. .
Therefore, when installing, it is necessary to apply some oil on the sealing ring, and at the same time ensure that the skeleton oil seal is perpendicular to the axis of the shaft. If it is not vertical, the sealing lip of the oil seal will drain the lubricating oil from the shaft, which will also lead to excessive sealing lips. Wear and tear. During operation, the lubricant in the casing slightly exudes a little to achieve a state in which an oil film is formed at the sealing surface.
The role of the role of the oil seal is generally to isolate the parts of the transmission parts that need to be lubricated from the output parts, so as not to let the lubricating oil leak, usually used for the skeleton oil seal
The rotating shaft is a rotating shaft lip seal. The skeleton acts like a reinforcing bar inside the concrete member, which acts to strengthen and maintain the shape and tension of the oil seal. According to the skeleton type, it can be divided into inner skeleton oil seal, outer skeleton oil seal, and inner and outer skeleton oil seal. The skeleton oil seal is made of high quality nitrile rubber and steel plate, with stable quality and long service life. Widely used in automobiles, motorcycle crankshafts, camshafts, differentials, shock absorbers, engines, axles, front and rear wheels and other parts.
1. Prevent mud, dust, moisture and other intrusion into the bearing from the outside;
2. Limit the leakage of lubricating oil in the bearing. The requirements for oil seals are that the dimensions (inner diameter, outer diameter and thickness) should be in accordance with the regulations; the proper elasticity is required, the shaft can be properly clamped and sealed, and the heat resistance, wear resistance, strength, and medium resistance are required. Oil or water, etc.), long service life.
Reasonable use of oil seals, should pay attention to the following points:
(1) Speed ​​of the shaft For design and structural reasons, high-speed oil seals should be used for high-speed shafts, low-speed oil seals for low-speed shafts, and low-speed oil seals should not be used for high-speed shafts, and vice versa.
(2) Ambient temperature In the case of high use temperature, polypropylene ester or silicon, fluorine, silicon fluororubber should be used. And should try to reduce the oil temperature in the fuel tank. In case of low use temperature, cold resistant rubber should be used.
(3) The oil seal with normal pressure can withstand poor pressure. When the pressure is too high, the oil seal will deform. Pressure-resistant bearing rings or reinforced pressure-resistant oil seals should be used under excessive pressure conditions.
(4) Degree of eccentricity on the installation When the oil seal and the shaft are too eccentric, the sealability will be poor, especially when the shaft speed is high. If the eccentricity is too large, an oil seal of "W" shape can be used.
(5) The surface finish of the shaft directly affects the service life of the oil seal, that is, the smoothness of the shaft is high, and the service life of the oil seal is long.
(6) Note that there should be a certain amount of lubricant in the lip of the oil seal.
(7) Pay special attention to prevent dust from immersing in the oil seal.
Precautions
1. Receive a fixed number of oil seals.
2, from the oil seal to the assembly, must be kept clean. Skeleton oil seal
3. Before assembly, check the oil seal and measure the size of each part of the skeleton oil seal. It is consistent with the size of the shaft and the cavity. Before the installation of the skeleton oil seal, the size of the shaft diameter and the inner diameter of the oil seal should be clearly compared. The size of the cavity should be compatible with the outer diameter of the oil seal. Check whether the lip of the skeleton oil seal is damaged or deformed, and the spring is not detached or rusted. Prevent the oil seal from being flat during transportation, subject to external force extrusion and impact, and destroy its roundness.
4. Before the assembly, do the machining inspection procedure, and measure the dimensions of the cavity and the shaft. It is especially chamfered, there is no slope, the end face of the shaft and the cavity should be smooth, the chamfer is not damaged and burr, clean. In the assembly part, there should be no burrs, sand, iron filings and other debris in the loading part (chamfering) of the shaft, which will cause irregular damage to the oil seal lip. It is recommended to use the r angle in the chamfering part.
5, in the operation skills, you can feel it by hand, whether it is smooth, really round.
6. The skeleton oil seal should not tear the wrapping paper too early before installation to prevent the foreign matter from adhering to the surface of the oil seal and bring it into the work. Skeleton oil seal
7. Before installing the machine, the skeleton oil seal should be coated with a lithium-based ester of molybdenum disulfide between the lips to prevent the shaft from causing dry grinding on the lip and affecting the interference of the lip. It should be assembled as soon as possible. If the oil seal seat of the oil seal is installed, if it is not installed immediately, it is recommended to cover it with a cloth to prevent the foreign matter from adhering to the oil seal. Lithium-based greased hands or tools must be clean.
8, the skeleton oil seal should be flat, can not have a tilt phenomenon. It is recommended to install with hydraulic or sleeve tools. Do not put too much pressure, the speed should be even and slow.
9. For the machine with the skeleton oil seal installed, mark it for profit tracking and pay attention to the whole process.
The application of skeleton oil seals is widely used in aviation, automobiles, motorcycles, railways, vehicles, ships, home appliances, construction machinery and other industries. Suitable for rotary frame oil seal
Dynamic and reciprocating motion seals. Installed in various models of engines, gearboxes, axles, ships, cylinders and other parts. It mainly prevents the penetration of the sealed medium (gas. liquid) and external foreign matter into the body.
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