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See morePV value bearingsSized bearingsMatching seat holeMatches shaft designBearing lifeInterference bearing assemblyInner diameter after assemblyWith the gap calculationBearing assemblyBearing MaintenanceBearing storageBearing Inspection MethodsSurface roughnessCommon hardness values
SF-2 The material is filled with tetrafluoroethylene modified polyoxymethylene as a material. It is a boundary lubricating material for high-load, low-speed motion, oscillating and hydrodynamic lubrication of bearings and opening and closing, thrust pads, sliders, ball seats and other components. SF-2 uses trace oils and greases and can be maintained without refueling under conditions of boundary lubrication and lubrication. Under completely oil-free conditions, the friction performance and allowable PV value of SF-2 are relatively low, so the oil pool is usually spread out and coated with lithium-based grease or grease.
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Note: SF-2 series products can also choose different base materials according to different working conditions, such as: bronze base plate, stainless steel base plate, and “lead-free” and other formula products. SF-20Y is an environmentally friendly lead-free product with colors of orange, orange and blue.
Pedal assembly, balance bushing, brake caliper, steering kingpin bushing and truck tail shaft sleeve, van, crane, truck crane, forest machinery, packaging machinery, construction machinery, hydraulic motor, agricultural machinery mining machinery, metallurgy Machinery, water conservancy machinery, steam locomotives, steel rolling industry, etc.
SF-2 The surface polymer is chemically resistant, so its corrosion resistance mainly depends on the steel back and the outer plating. The back surface of the steel is plated with copper or tin, which can effectively prevent atmospheric corrosion; if it is used in corrosive media, the steel back can be galvanized.
SF-2 The wear characteristics under the conditions of grease lubrication, as shown below: Its "Run together" wear rate is very small; visible from the line segment in the figure, when the grease applied to a certain degree when assembled, the wear rate gradually increased Large, as indicated by dashed line 1; If the fuel is refueled before the wear rate increases, the wear rate remains steady; when the time between refueling intervals is appropriate, the service life of the material can be greatly extended. The time for this refueling interval depends on the accumulated wear. For grease lubrication: The ambient temperature is lower than 80°C. Lithium soap grease is recommended. For ambient temperatures higher than 80°C, silicone oil based grease is recommended; grease containing EP additives is not recommended.
