First, the analysis of the phenomenon of bearing fatigue damage:

1. The length of the period during which the bearing begins to use the first material to fatigue is related to the rotational speed of the bearing, the size of the load, and the degree of lubrication.

2. Fatigue is the result of the periodic occurrence of shear stress under the surface of the load. After a period of time, these shear stresses cause a small cracked cranium, and then gradually extend to the surface. When the rolling elements pass through these split skulls, they are slightly cracked. The block falls off, forming a so-called "peeling phenomenon", and then as the peeling continues to expand, the bearing is damaged.

3. The above is a description of bearing fatigue. It initially occurs below the surface. Although the initial stripping is usually very slight, as the stress increases and the crack increases, the stripping area spreads. This damage usually occurs. For a long time, the obvious visible phase is when noise and vibration increase.

4, the bicycle bearing in the initial stage of damage, may only be difficult to feel when turning, and later found that there is a pockmark when rotating, and once the pockmark is felt, the bearing is not unusable, just advance the beads every time Both the shaft bowl and the shaft gear have more wear and more serious damage. Since the bicycle is a low-speed high-pressure type bearing type, even if the surface peeling phenomenon is serious, it is not uncomfortable, but invisible and silent. It consumes your motivation, and your feelings may just be that the car doesn't know why it's not good to ride.

5. Therefore, before the bearing is completely destroyed, it provides sufficient time for the user to find out. Do not ignore the existence of such friction. It will slow down the riding speed and make the long-distance physical power consumption more slow and slower.
If the roughness of the surface is small, if the lubricating film has a proper thickness, the probability of surface stress generation is relatively low, which is why it is necessary to properly select the appropriate oil for lubrication. However, if the pressure load exceeds The pu value of the oil film (fatigue load limit value, such as excessive speed, excessive pressure impact), the fatigue of the material will come sooner or later.

Second, the reasons for the damage of the bearing and solutions:

1, the reason for the damage of the bearing in advance - (not properly lubricated)
Although it is possible to install “maintenance-free” rubber-sealed bearings, a percentage of the premature failure of the bearings is still due to the incorrect application of the grease technology.
Any bearing that is not properly lubricated will inevitably fail prematurely. Because the bearing is not easy to assemble and disassemble in the hub, the innate grease is used congenitally, and the grease is not replaced in the later use, or the grease occurs. After carbonization and deterioration, it will not be replaced in time, so it is difficult for your hub to have a long enough life and good lubrication.
The forests used for bicycles We now encounter small-sized bearings that are mostly deep-groove balls, such as 609, 6000, 6001, and 6200. These are industrially used for the stators and rotors of small-scale motors. Such a small Peeling is usually pre-installed with a low-viscosity, high-lubricity broad-spectrum grease.
In the past, we have mistakenly purchased and used such expensive greases, such as SKF's LGMT-2 synthetic lithium base grease, which was purchased in the past. This is a low-torque, low-friction small motor lubricant. It is also used in most small skf Palin. The price is still very expensive at that time. The price of 200 grams of packaging is as high as 60 yuan, but the viscosity of this oil is only 110, for high load, extreme pressure, reciprocating motion. The ability is poor, and according to the use of the bicycle shaft, this should be a low speed, high extreme pressure (because a lot of pressure is concentrated on only a few small Palin, and the impact will jump more pressure) So we chose SKF's LGEP-2 synthetic lithium base grease, which is expensive (155 yuan), but its viscosity reaches 200, high load, high waterproof, high rust, high shock resistance, although it is low twist It is not as good as the LGMT-2 from the friction index, but it is completely suitable for the front and rear axles and the front bowl of the bicycle. (Today we use LGEP-2 lubrication for some old models, such as rm40.)

2, the reason for the damage of the bearing in advance - (improper assembly)
Another reason for the damage up to a percentage of 16 is that this assembly is improper, and the wrong or violent loading method makes the Palin have a hard hit on the surface of the smooth bowl when loading.
In order to make the Palin card tighten the axis, prevent the friction of the bushing (this phenomenon will produce high temperature instantaneously on the high-speed rotating machine, causing the lubricating oil to burn out and even cause the heat to jam and cause the machine to stop), so the inside of the bearing The é“› and the outer bowl (also known as the bearing box in the industry) use a "overweight" phenomenon. Generally speaking, the shaft is larger than the inner lining, or the outer bowl is larger than the load. This kind of interference requires a lot of power to load. Into, and such loading requires a great deal of force to strike the Palin, which will cause the Palin to be damaged during the tapping process, so the industrial large bearings usually adopt heating, hydraulic jacking and the like.
The bicycle uses a rubber-sealed deep groove ball bearing. Such a bearing is most afraid of tapping (the needle roller Palin and the big Palin are slightly more resistant to the tapping), and the heating loading method cannot be used, but due to the bicycle Palin's interference is very small, even if the Qinghao Palin drum can be placed into the Palin by hand, so the knocking in the rubber hammer is relatively safe, but the backing pad needs a very flat surface. The use of static pressing, such as vise pressing, is the best way.

Outdoor PTZ Camera

We are manufacturer of Outdoor PTZ Camera in China, if you want to buy Mini Camera , Outdoor Camera,Hidden Wireless Cameras,Camera Cctv With Motion Detection Solar Camera please contact us.

What is solar monitoring?

Outdoor PTZ Camera,Outdoor Camera CCTV HD Security,Full color HD 1080P AI Camera, PTZ Camera Outdoor Network wifi,1080p Night Vision camera

Shenzhen Fuvision Electronics Co., Ltd. , https://www.outdoorsolarcamera.com