Smooth grease using common sense

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Smooth grease using common sense

Source: China Bearing Network Time: 2017-10-21
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1. There are two kinds of smooth methods for selecting the front and rear wheel bearings of the smooth hub: one is that the bearing is filled with smooth grease; the inner cavity of the hub is also filled with smooth grease; this traditional method is called full hub smooth, another The kind is only to put smooth grease on the bearing; the inner cavity of the hub is only thinly coated with a smooth grease to prevent rust;
When the car wheel bearing is smooth; some people are used to filling the hub cavity with smooth grease; this is not only useless; and harmful. After the hub cavity is filled with smooth grease; the bearing heat dissipation is poor; the resistance is increased; the temperature rises; smooth The fat accelerates and changes, the smooth grease is swollen by heat; the oil seal is squeezed out; the smooth grease that flows out onto the brake shoe; the brake will fail; it becomes a thing. Only a thin layer of smooth grease is applied in the cavity. Anti-rust; not only can avoid the above damage; but also save a lot of smooth grease. Take the liberation of CAl091 as an example; use a full hub smooth one protection period (17500km) 4 wheels with a grease amount of 3.5-4kg; It only needs about 0.5kg; it is more than 80% smoother than the full hub. According to the experiment; the wheel is transformed with equal force; the hollow hub can be transformed into 11.5 turns; the full hub is smooth only 6 turns; the empty hub is proved to save power. It is also beneficial. So in practice, the hollow hub should be chosen to be smooth.
2. Reasonable selection of smooth grease types and trademarks; most vehicles in China use No. 2 and No. 3 calcium-based smooth grease; this can meet the requirements under normal operating conditions; during this period, the consistency of No. 2 calcium-based smooth fat is better than that of Yingying 10. Figure 跎倌Σ 枇 枇 枇 蝗缡褂 蝗缡褂 蝗缡褂 桓撸 桓撸 桓撸 桓撸 桓撸 桓撸 桓撸 桓撸 桓撸 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 Left and right; if traveling in the summer or mountainous area in the south; if the bearing temperature is high; it is not as good as the calcium-based smoothing grease of No.3.
The biggest problem in the application of calcium-based smooth grease is poor temperature resistance; its application temperature can't exceed 70 80 °C; otherwise it will soften and lose. The car travels under different conditions; the temperature varies greatly. For example: in Beijing area Usually the mountain road is driven by the usual driving method; the bearing temperature of the hub is about 60 °C; the calcium-based smooth grease of No. 2 or No. 3 can be used. If there is more downhill; the brake is frequently used; the brake hub generates a lot of heat; Will pass to the bearing; bearing temperature can reach 70 80 ° C; if the use of calcium-based smooth grease; will occur oily appearance. In this case; should use calcium-sodium smooth grease (or ball bearing grease) or lithium-based smooth grease Calcium-sodium-based smooth fat is poor in water resistance; it can not be used in cars that often wading. Summer in the south; especially when going downhill; bearing temperature can exceed 100 °C; the best use of lithium-based smooth grease. Otherwise; smooth Loss of fat softening; not only bad grease; and premature bearing damage.
3. The graphite smooth grease smooth steel plate springs are used by the driver in the third-grade protection; often do not need graphite smooth grease; and the calcium-based smooth grease smooth steel plate spring; some even brush oil; so the steel spring is simply damaged; When traveling under the conditions of construction site, mountain and poor road conditions; the vehicle fluctuates greatly; the impact load of the steel plate spring is large; it is more vulnerable. The graphite smooth grease is added with graphite; the graphite is filled with the rough surface between the steel plates; the pressure resistance is improved, The ability to withstand impact load. Imitate the vibration test of the steel plate spring spring; the plate spring with calcium-based smooth grease is oscillated 700 times in a row; the steel plate spring with graphite smooth grease is ruptured 1500 times in a row to crack; More than double.
4. Containers, things should be hygienic and distribute smooth grease; check whether the containers and things can be hygienic. Containers containing smooth grease should be tightly covered; avoid mixing of mechanical impurities. If used, if there is dust, debris, etc. Should be scraped; must not be mixed. Distribute smooth grease should use special things; containers, things should be used later on the plastic bag cover. After digging the grease; the remaining smooth grease should be smoothed to avoid oil separation.
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