ntn bearing grease used in industry and the deep groove ball bearing model errors
1, ntn bearing grease used in industry Wrong
1. Indiscriminate use of imported oil made cars
Some owners think that a certain ratio of domestic oil imports oil well, and therefore made cars, especially the use of new vehicles imported oil. As everyone knows, this is often not worth the candle, there will be many such defects. For example, most low viscosity oil imports, domestic cars can not meet the requirements of the oil viscosity. China-made engine parts with a variety of materials with thermal expansion coefficient and with a large gap compared with imported cars, and most of the domestic car engine oil cooler is not installed, if the blind use of imported oil, because of the engine at normal operating temperature, oil had thin to low oil pressure, and even less than the required working pressure,
Can not meet the normal lubrication, so that engine wear increased.
2. Diesel vehicles to use petrol engine oil
Oil has oil and diesel oil gasoline divided. Gasoline and diesel engines while also at high temperature, high pressure, high-speed and high load conditions, but there are still large differences between the two. Diesel engine compression ratio is 2 times more than gasoline, its main components by high temperature and pressure is much greater impact than gasoline, so some parts of the production of materials is different. For example, the gasoline engine main bearing and connecting rod bearing available material is relatively soft, corrosion resistance, good Babbit to produce, and the engine bearings must use lead or lead alloy bronze to produce high-performance materials, but corrosion of these materials poor performance.
To do this in the diesel oil refining process, to add more corrosion agent for use in bearing surface of bearing a layer of protective film to reduce corrosion, and increase the wear resistance. As the gasoline engine oil is not such a corrosion agent, if to add diesel engines, bearing in use on the vulnerable spots, Ma Hang, and even into the negative consequences of pieces falling off, oil will soon become dirty and cause Burning Bearing and Seizure accident. In addition, the sulfur content of diesel fuel large, such harmful substances in the combustion process will form sulfuric acid or sulfurous acid, together with the high temperature and pressure exhaust a fleeing into oil
Bottom shell, the accelerated oil oxidation and deterioration, so the engine oil refining process need to add some anti-oxidation additives, oil alkaline. If acid gas fleeing into, may play a role in and do not cause the oil too quickly oxidized. The gasoline engine oil additives are not added such as neutral, if its used in diesel engines, because of the rapid change of acid gas corrosion failure. So Do not add the word to use diesel engine oil gasoline engine.
3. When installing cylinder pad butter
When installing cylinder cushion some mechanic like butter coat the cylinder pad, that this would increase the tightness of the engine. As everyone knows, this is not only useless, but harmful. As we all know, cylinder gaskets in the automotive engine cylinder block and cylinder head sealing material between the important, demanding that it not only seals the cylinder temperature and pressure generated by gas, and must be sealed through the cylinder head and cylinder body has a certain pressure and flow rate of cooling water and oil, which requires dismantling cylinder pad, special attention to the sealing quality.
If the cylinder pad butter, when the cylinder head bolts tightened, the part of the butter will be squeezed into waterways and oil cylinders Road, stay in the cylinder head gasket between the work of the butter in a cylinder, due to the high temperature, part of the flow into the cylinder combustion the other part will be kept burning in the cylinder block and cylinder head coke combination of surface temperature under high pressure, cylinder pad will easily breakdown or burn, causing the engine leak. Therefore, when installation of the cylinder not to smear butter pad.
2, deep groove ball bearing type Post code
C2 is smaller than normal internal radial clearance clearance
C3 internal clearance greater than normal radial clearance
C4 greater than C3 radial internal clearance
C4 C5 is greater than the internal radial clearance
DB layout back to back matches in the installation of two single deep groove ball bearings.
DF matching layout in the face to install two separate deep groove ball bearings.
DT installed in tandem layout matched single row deep groove ball bearings of the two.
E Enhanced GLOBAL
GJN with consistency NLGI grade 2 for the polyurea thickener grease type, temperature range of -30 to +150 degrees Celsius (normal filling volume)
HT with consistency NLGI grade 2 for the polyurea thickener of the grease type, temperature range of -40 to +150 degrees Celsius (normal filling volume)
J stamping steel cage
Consistency is NLGI grade LHT23 with two lithium grease thickener, a temperature range of -50 to +140 degrees Celsius (normal filling volume)
LT with consistency for the NLGI grade 2 lithium grease thickener, a temperature range of -55 to +110 degrees Celsius (normal filling volume)
LT10 with consistency is NLGI grade 2 lithium grease thickener, a temperature range of -50 to +90 degrees Celsius (normal filling volume)
M Machine cut brass cage to the ball-centering. After the M with a number to indicate the different levels of design and materials, for example, M2
MA machine cut brass cage, outside the delineation of heart
MAS same MA, but the surface of a lubrication groove guide
MB machine cut brass cage, within the delineation of heart
MBS with MB, however, the surface of a lubrication groove guide
MT33 with consistency for the NLGI level 3 of the lithium grease thickener, the temperature range of -30 to +120 degrees Celsius (normal filling volume)
MT47 with consistency is NLGI grade 2 lithium grease thickener, a temperature range of -30 to +110 degrees Celsius (normal filling volume)
N on the outer ring with open ring ditch
There are openings NR outer ring ditch, with ring opening
N1 has a notch on the outer side
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