German dph seals dph model dph price

dph seals refer to devices that prevent fluid leakage, formed by at least one pair of end faces perpendicular to the axis of rotation maintaining contact and sliding relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, in conjunction with auxiliary seals. When the auxiliary seal of the compensation ring is a metal bellows, it is called a bellows mechanical seal. There are mainly the following four types of components. a. Primary sealing elements: rotating ring and stationary ring. b. Auxiliary sealing elements: O-rings. c. Clamping elements: springs, thrust rings. d. Drive elements: spring seat and keys or fixing screws.

dph seal principle

Since there is an oil film controlled by the oil seal lip between the oil seal and the shaft, this oil film has fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film causes the end of the oil film in contact with air to form a meniscus, preventing the leakage of the working medium and thus achieving sealing of the rotating shaft. The sealing capability of the oil seal depends on the thickness of the oil film on the sealing surface; if the thickness is too great, the oil seal will leak; if the thickness is too small, dry friction may occur, causing wear on the oil seal and shaft; if there is no oil film between the sealing lip and the shaft, it is easy to cause heating and wear. Therefore, during installation, some oil must be applied to the sealing ring, and it must be ensured that the skeleton oil seal is perpendicular to the shaft axis; if not perpendicular, the sealing lip of the oil seal will drain the lubricating oil from the shaft, which will also lead to excessive wear of the sealing lip. During operation, it is ideal for a slight amount of lubricant in the housing to seep out to achieve the state of forming an oil film at the sealing surface.

dph seal function

The function of skeleton oil seals is generally to isolate components requiring lubrication in transmission parts from output components, preventing lubricating oil from leaking. They are typically used on rotating shafts and are a type of rotating shaft lip seal. The skeleton acts like reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. According to the skeleton type, they can be divided into inner skeleton oil seals, outer skeleton oil seals, and exposed inner and outer skeleton oil seals. Skeleton oil seals are made of high-quality nitrile rubber and steel plates, offering stable quality and long service life. They are widely used in automobiles, motorcycle crankshafts, camshafts, differentials, shock absorbers, engines, axles, front and rear wheels, and other parts. 1) Prevent sand, dust, water vapor, etc. from invading the bearing from the outside; 2) Restrict the leakage of lubricating oil from the bearing. Requirements for oil seals include that dimensions (inner diameter, outer diameter, and thickness) must comply with regulations; appropriate elasticity is required to properly grip the shaft and achieve a sealing effect; they must be heat-resistant, wear-resistant, have good strength, be resistant to media (oil or water, etc.), and have a long service life.

dph seal precautions

1) Obtain a fixed quantity of oil seals. 2) From receipt to assembly, oil seals must be kept clean. 3) Before assembly, inspect the oil seals, measure whether the dimensions of all parts of the skeleton oil seal match the shaft and housing dimensions. Before installing the skeleton oil seal, clearly compare the shaft diameter with the inner diameter of the oil seal to ensure they match. The internal dimensions of the housing must be suitable for the outer diameter width of the oil seal. Check whether the lip of the skeleton oil seal is damaged or deformed, and whether the spring has fallen off or rusted. Prevent the oil seal from being placed flat during transportation, subjected to external squeezing and impact, which could destroy its roundness. 4) Perform machining inspection procedures before assembly, measure whether the dimensions of the housing and shaft parts are correct, especially the inner chamfer, which must not have a slope. The end face machining of the shaft and housing must be smooth, with no damage or burrs on the chamfer. Clean the assembly area; there must be no burrs, sand, iron chips, or other debris at the shaft insertion point (chamfer), as these can cause irregular damage to the oil seal lip. It is recommended to use a r angle for the chamfer. 5) In terms of operational technique, you can feel with your hand whether it is smooth and truly round. 6) Do not tear open the packaging paper of the skeleton oil seal too early before installation to prevent debris from adhering to the oil seal surface and entering into operation. 7) Before machine installation, apply an appropriate amount of lithium-based grease containing molybdenum disulfide between the lips of the skeleton oil seal to prevent dry grinding on the lip during instantaneous shaft startup, which affects the lip interference fit, and assemble as soon as possible. If the oil seal housing with the installed oil seal is not immediately installed in the machine, it is recommended to cover it with a cloth to prevent foreign matter from adhering to the oil seal. Hands or tools applying lithium-based grease must be clean. 8) Skeleton oil seals must be installed flat, without tilting. It is recommended to use hydraulic equipment or sleeve tools for installation. The pressure should not be too high, and the speed should be uniform and slow. 9) Mark the machine on which the skeleton oil seal is installed for tracking purposes, and pay close attention to the entire process.

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