Wheel hub unit

Abstract

The invention discloses a wheel hub unit. The wheel hub unit comprises a wheel hub body, a shaft sleeve and a bearing. A first sealing ring and a second sealing ring are arranged between the sealing face of the wheel hub body and the sealing face of the shaft sleeve. The inner side of the first sealing ring is a sealing zone and the outer side of the second sealing ring is an atmosphere zone in the axis direction. An oil-storing cavity is formed among the sealing face of the wheel hub body, the sealing face of the shaft sleeve, the first sealing ring and the second sealing ring. An oil filler hole is formed in the wheel hub body. A screw-plug is arranged on the oil filler hole. According to the oil fluid microcosmic motion principle, the functional life of lubricating oil is prolonged; sealing lips of the sealing rings can maintain lubricating oil films; even through one sealing ring is invalid, the other sealing ring can still play a sealing function, so that the service environment of the sealing rings is improved, the service life of the sealing rings is prolonged and the sealing rings are convenient to disassemble.

Description

technical field [0001] The invention relates to the technical field of vehicle hubs, in particular to a hub unit lubricating its bearings with lubricating oil. Background technique [0002] For the bearings in the hub unit, oil lubrication and grease lubrication are usually used. The sealing structure of grease lubrication is relatively simple, but during maintenance, the bearing needs to be replaced or removed. The maintenance of oil lubrication is relatively simple, you only need to drain the lubricating oil and refill it. This advantage makes oil lubrication the mainstream direction of the wheel hub units of trucks, buses and other vehicles. However, oil lubrication will be affected by comprehensive factors such as temperature, heavy load, and impact load, and it is easy to leak oil, so higher requirements are put forward for the sealing structure. [0003] In the prior art, an oil seal is usually used to seal the lubricating oil. In order to ensure the sealing effect, ...

AI Technical Summary

Problems solved by technology

During use, due to the lubricating oil inside the inner oil seal, its working condition is good, but the outer oil seal is exposed to the natural environment for a long time, the oil film will evaporate in a short time, and the oil film cannot be replenished in time, so that the outer oil seal is in dry friction state, leading to premature failure of the outer oil seal

Therefore, the life of the outer oil seal is shorter than that of the inner oil seal with the same material. In fact, only the inner oil seal can effectively block oil in the double oil seal structure, and the oil sealing effect of the outer oil seal is very limited.

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