The role and precautions of the skeleton oil seal

The function of the skeleton oil seal is generally to isolate the parts that need to be lubricated in the transmission parts from the output parts, so as not to allow the leakage of lubricating oil. The skeleton oil seal rotary shaft is a kind of rotary shaft lip seal. The skeleton is like the steel bars in the concrete member, which acts as a reinforcement and enables the oil seal to maintain its shape and tension. 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 sediment, dust, moisture, etc. from intruding into the bearing from the outside;

2. Limit the leakage of lubricating oil in the bearing. The requirements for the oil seal are that the dimensions (inner diameter, outer diameter and thickness) should meet the regulations; appropriate elasticity is required, which can properly clamp the shaft and play a sealing role; it must be heat-resistant, wear-resistant, strong, and resistant to media ( oil or water, etc.), long service life.

Reasonable use of oil seals should pay attention to the following points: (1) Due to the design and structural reasons of shaft speed, high-speed oil seals should be used for high-speed shafts, low-speed oil seals should be used for low-speed shafts, and low-speed oil seals cannot be used for high-speed shafts , and vice versa. (2) When the ambient temperature is high, polyacrylate or silicon, fluorine, and silicon fluorine rubber should be selected. And should try to lower the oil temperature in the tank. When the operating temperature is too low, cold-resistant rubber should be used. 3) The oil seal with general pressure has poor pressure bearing capacity, and the oil seal will be deformed when the pressure is too large. Under the condition of excessive pressure, a pressure-resistant bearing ring or a reinforced pressure-resistant oil seal should be used. (4) The degree of eccentricity on the installation When the eccentricity of the oil seal and the shaft is too large, the sealing performance will be deteriorated, especially when the shaft speed is high. If the eccentricity is too large, a "W"-shaped oil seal can be used.