Assembly oil seal with sensing function

Abstract

The invention provides an assembly oil seal with a sensing function. The assembly oil seal with the sensing function comprises a flange, an oil seal lip part matched with the inner ring of the flange, a coder and a sensor corresponding to the coder; the coder is an inverted U-shaped ring with one long end and one short end; the short end of the coder is a coder body arranged on the flange; the inner side of the long end of the coder is matched with the inner ring of the oil seal lip part. The assembly oil seal with the sensing function is durable, capable of accurately detecting the rotary speed of a crankshaft and integrated with the sensor.

Description

technical field [0001] The invention relates to an oil seal, in particular to an assembly oil seal with sensing function. It belongs to the field of sealing technology. Background technique [0002] In the past, encoder technology was mostly used in the field of ABS bearings. In order to understand the rotational speed of the bearing driven by the shaft, the ABS encoder was first invented. It uses axial and radial stamping, powder metallurgy to form gratings and far-near encoders, and synthetic The magnetic encoder is used for receiving, and the magnetic encoder usually only uses NBR rubber. [0003] With the encoder technology, in the field of automotive applications, the bearings of the hub part are basically an assembly of encoders, sensors, bearings, and flange brackets, referred to as the hub unit. [0004] However, with the rapid development of electronic technology in the automobile industry, only counting the speed of the wheels can no longer meet the needs of auto...

AI Technical Summary

Problems solved by technology

However, the rotation of the wheel is only a few hundred revolutions per minute, while the crankshaft speed is as high as several thousand revolutions per minute, and the design principle of the entire engine part is that there is no bearing, because the bearing is not suitable for the working conditions of the engine. Therefore, all The technology originally used on ABS bearings cannot be copied and applied to the engine

[0005] In view of the ultra-high speed of the engine and the current situation of de-bearing, the transmission method must be reconsidered. The original ABS encoder bearing has many places that are not suitable for the crankshaft. First of all, its number of revolutions is small, and the statistics are not enough. Accurate, secondly, there is no starting point and correction data processing function, and during the radial design process of the magnetic encoder, due to the difference in diameter of the inner and outer circles, all NS levels are distributed in a fan-shaped circle. When processing data information, the accuracy It is not easy to guarantee that when the sensor receives NS information, because the fan-shaped distribution of the outer ring is larger than the inner ring, the diameter points aligned by the sensor are different, and the distribution of the received NS change circle length will also be different, and the data error is likely to be too large, which cannot meet the requirements of the engine. High-speed and accurate statistical requirements

[0006] At present, the oil seal used on the engine still adopts the separate design of the encoder, flange oil seal, mounting bracket and sensor. When they are assembled together during use, assembly errors and out-of-tolerance often occur

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