Germany Landefeld seals Landefeld model Landefeld price

Landefeld seals are the customary term for general seals; simply put, they are seals for lubricating oil. They are mechanical components used to seal grease (oil is the most common liquid substance in transmission systems, and also refers to general liquid substances), isolating the parts requiring lubrication in the transmission assembly from the output parts to prevent lubricating oil leakage. Seals used for static sealing and dynamic sealing (generally reciprocating motion) are called oil seals. The representative form of oil seals is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully encapsulated in rubber; the term 'oil seal' generally refers to this type of tc cased oil seal.

Landefeld seal types

1) Compression seals: Compression seals, especially O rings, have been widely used in seals. Other types such as X type, T type, D type, square, and triangular shapes are suitable for different applications. The direction of improvement is to make their sealing performance stable and reliable, increase their pressure resistance, and reduce friction. They can also be combined with low-friction plastics such as PTFE and nylon slide rings and support rings to form composite seals, increasing pressure resistance and reducing friction. Some manufacturers' products are permitted to reach speeds of 7.5m/s and sealing pressures of 5.6MPa. 2) Reciprocating lip seals: Reciprocating lip seals, also known as lip gaskets or cups, are widely used for dynamic sealing in hydraulic system reciprocating cylinders. The pressure-bearing surface of this seal is lip-shaped; during installation, there is a minimal interference fit, allowing the lip edge to fully contact the sealing surface to create a seal. When the cylinder operates, as pressure increases, the contact force and contact area increase, thereby improving sealing. During the cylinder return stroke, pressure decreases, and the contact area and friction are lower than during the working stroke, creating a breathing effect that lubricates the lip. There are many types of reciprocating dynamic seals, commonly including J type, L type, U type, V type, and Y type. There are also various combination and composite seals, such as bellows-type, diaphragm-type, and multi-lip seals. Extrusion must be prevented under high pressure by selecting materials with sufficient tear strength, hardness, and modulus, or by using support rings for protection, or by employing reinforced elastomers. Seals used under high pressure, high speed, or high temperature often use composite combination seals. Their common feature is having two lips in contact with the cylinder wall. A groove is provided in the middle of the sealing area to store media, improving lubrication, reducing lip wear, and ensuring reliable sealing. Lip seals used in pneumatic systems are required to operate without oil lubrication; contact pressure is a factor, and some designs integrate a dust wiper with the seal. 3) Rotary shaft lip seals: There are no fewer than 200 varieties of similar structures, such as hydrodynamic type, inner-cased skeleton, assembled type, outer-exposed skeleton, PTFE-bonded AF type, dual-modulus return-flow type, etc. The advantage of the outer-exposed skeleton assembled type is accurate positioning, high concentricity, and good heat dissipation conditions. It is stable under pressure and vibration, resulting in a longer service life while saving rubber material. The dual-modulus return-flow type applies wave seal theory; by adding a low-modulus, easily deformable material at the sealing contact point, a return-flow effect is achieved, simultaneously reducing product design and mold processing costs. Joints between rigid waterproof layers and gable walls, parapet walls, and structures protruding from the roof should be properly treated with flexible sealing.

Landefeld seal influencing factors

Hydraulic seals play a crucial role in the integrity of hydraulic and pneumatic systems. If the seals of a hydraulic or pneumatic component are substandard, the component itself cannot be considered a good product. Many factors affect seals. First, pressure is a significant factor influencing seal quality; the magnitude of pressure and the duration of pressure cycles greatly impact seal damage (such as extrusion). The higher the pressure, the greater the influence of other factors on seal performance, such as temperature, speed, seal material, the gap between the piston and cylinder barrel, and the gap between the piston and cylinder head. Another factor is temperature and friction. It is difficult to describe the maximum and minimum operating temperatures for a seal material because this is the result of a combination of factors. Operating temperatures for pistons and piston rods differ, so they must be selected accordingly. Another factor is the surface roughness of the seal product; surface characteristics, pressure, media, temperature, seal material, seal type, and motion speed all influence seals. Finally, surface treatment: experience shows that the surface characteristics of cylinder pistons and piston rods have a significant impact on seal life. Surface characteristics are commonly defined by the RA value of surface roughness, where RA is the arithmetic mean of the absolute values of surface profile deviations from the centerline. However, these values do not fully represent the impact of surface conditions on seals, because even at the same roughness, different surface shape characteristics can lead to varying degrees of seal wear.

Landefeld seal functions and applications

Engine: Crankshaft - front and rear crankshaft oil seals; Valve - valve oil seals (engine repair kit o rings) (distributor oil seal, water pump oil seal, balance shaft oil seal, oil pump oil seal...); Camshaft - camshaft oil seal; Transmission: Transmission - front and rear transmission oil seals; Shift lever oil seal (transmission repair kit o rings) (Transfer case - front and rear transfer case oil seals); Rear Axle: Half-shaft - rear half-shaft oil seal; Differential - (front/rear) pinion oil seal; Rear wheel oil seal; Front wheel oil seal; Steering gear oil seal (steering gear repair kit o rings); Power steering booster oil seal (front half-shaft oil seal). Oil seals are required wherever a rotating housing contains liquid lubricating oil and connects to the exterior. Some are made of rubber, some of metal, but most are steel-cased rubber, such as rear crankshaft oil seals, front and rear transmission oil seals, left and right half-shaft oil seals, front main reducer oil seals, and air compressor crankshaft oil seals.

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