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Liugong parts: role of oil filter

Liugong parts: role of oil filter

The oil filter is located in the lubrication system of the internal combustion engine. The upstream is the oil pump and the downstream is the main oil passage. With the development of modern internal combustion engine towards high speed and high output, the capacity of lubrication system is large and the oil temperature is improved. Oil radiator and piston oil injection cooling devices are widely used to complicate the structure. At the same time, the quality of lubricating oil is improved and the types of additives are increased, which puts forward new requirements for the filtering function of the filter. All these give new content to the supporting technology of the oil filter.

1. Service conditions of internal combustion engine

The far running conditions of internal combustion engine are diverse, from urban bridge vehicles to agricultural trucks, from indoor power generation to oilfield engineering machinery. Its use conditions vary greatly. In terms of load, there are light load, medium load, heavy load and extra heavy load. In terms of load action time, there are continuous load and intermittent load. These different working conditions affect the changes of oil temperature and oil pressure in the lubrication system, that is, the working conditions of the filter, and also determine the characteristics of the filter material and the size of the filter area.

2. Technical level of internal combustion engine operators

The oil filter is a component that needs frequent maintenance or replacement. The cycle is about 5000 to 10000 km, or 150 to 250 hours. The replacement of rotary filter is the most convenient. Unscrew an old one by hand or tools, and then screw on a new one by hand. There are no other parts to be disassembled.

In sharp contrast to the spin on filter, it is a centrifugal filter. Its filtering effect is superior, there are no parts to be replaced, and it can almost have the same service life as the engine. However, there is a high-speed rotating rotor (5000-8000r / min). Reassemble after finishing. Such work must have a fairly high technical level to do well, otherwise the advantages of centrifugal filter will be lost in whole or in part.

3.There are four bases for determining the matching flow of the oil filter through the flow of the oil filter:

A / filter flow data required by the user.

B. Type, power and strengthening degree of supporting internal combustion engine.

C. Oil pump flow.

D. Main oil passage flow.

The empirical formula used to calculate the main oil passage flow from the internal combustion engine power is as follows: q = (7-1 υ) L / HPHR (gasoline engine) q = (10-20) l / HPHR (diesel engine)

If the user provides the design flow of the oil pump or the measured flow of the new oil pump, the filter flow can be 50-60% of the flow value of the oil pump. Because the oil pump designer has considered that the oil pump will gradually wear out and the flow will gradually decrease during use. In order to meet the needs of the host, he must increase the design flow. Liugong excavator accessories

Some users also provide the filter designer with the design flow of the main oil passage of the internal combustion engine. In this case, the flow value of the filter should be set at 1.5-2.0 times the design flow of the main oil passage. This is because with the normal wear of the internal combustion engine, the flow of the main oil passage will increase accordingly to maintain the normal oil pressure.

As for the flow of the shunt filter, it can be 5 ~ 10% of the flow of the full flow filter, or it can filter all the engine oil in the engine oil pan every 10 minutes.

4. Installation position of oil filter on internal combustion engine

The filter can be installed in three ways: upright, transverse and inverted. The centrifugal filter must be installed upright, and the included angle between the center line of rotor shaft and the plumb line shall not be greater than 20 ℃. Other types of filters do not have this restriction. The filter installed upside down shall be equipped with one-way valve or check valve to prevent the lubricating oil from draining from the filter after the engine is stopped. Once drained, a short period of oil shortage will occur when the engine is started again. It may increase the wear degree of the engine, or it may cause the main engine to jam.

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