The purpose and methods of bearing lubrication
For bearings, lubrication is important questions about its performance. Lubricant or lubricating way appropriate or not will greatly affect the bearing life.
Following the lubricating effect:
1) each part of bearing lubrication, reducing the channel surface and ball rotary friction, ball and keep the sliding friction, sliding friction retainer and the channel guide plane
2) take the bearing internal internal friction heat and other external came from the heat, to prevent deterioration of the heating of the bearing and lubricant
3) of the rolling bearing contact surfaces often form oil film appropriate, relieve the impact load concentrated stress and the fatigue life is prolonged bearing
4) to prevent the ball, channel, keep the intrusive device corrosion as well as garbage, foreign bodies, moisture, rust and dust bearing.
Lubrication of grease lubrication and oil lubrication main points, the general comparison is shown as follows:
| project | grease | oil |
| sealing device of | simple | is more complex, the need to pay attention to the maintenance of |
| good | is a very good | |
| speed | low-speed and medium speed | also can be used for high speed |
| torque | large | relatively small |
| lubricant | simple | |
| lubricant | is short for | long |
| cooling effect | without | good (need to loop) |
| impurity filter | difficult | to |
| lubricant leakage | oil spill pollution less | does not apply to don't spill sites |
Zhi Runhua
Lubricating grease fill can be achieved after a grease long time does not need to be added, and the sealing device structure is relatively simple, so widely used.
Lubricating grease in advance in the sealing mode of seal bearing grease filling, and the filling amount of grease inside the housing, grease filling for every once in a while to supplement or replace.
In addition, the multiple bearings require lubrication of machinery, also use the pipe connected to the centralized supply in the lubrication grease.
1) filling amount of lubricating grease
Grease filling amount within the enclosure with the structure and volume of shell and different, filled to volume of 1/3 should be 1/2.
The filling volume is excessive, grease for stirring heating deterioration, aging and softening, should pay attention to.
But for low speed bearings, invasion to prevent foreign bodies, sometimes to the 2/31 filling volume.
2) and replace and replenish the lubricating grease
Add grease and replacement are closely related to lubrication mode, either way, must use grease clean, and pay attention to prevent the intrusion of external foreign body.
Grease replenishment should be day to the same brand of lubricating grease.
Add the lubricating grease, particularly important is should guarantee that the new grease into the bearing internal indeed.
Oil lubrication
High temperature lubricating oil is suitable for high speed bearings and resistant to certain extent, but also to reduce the vibration and reduce the noise effectively, mostly for grease lubrication is not applicable to the occasion.
Oil lubrication can be divided into:
(1) the oil bath lubrication lubrication (2) (3) splash lubrication
(4) the lubrication cycle (5) (6) injection lubricating oil mist lubrication
(7) the oil air lubrication
Standard lubricant
Oil is composed of base oil, tackifier, additive composed of semi solid lubricant, need according to its portfolio to select appropriate to use oil.
(1) base oil
The base oil in general are the use of mineral oil, but in order to improve the heat resistance, low temperature fluidity, therefore also use silicone oil synthetic oil.
(2) the tackifier
Tackifier has a variety of agent and so on, is to control the mechanical stability, water resistance, temperature range for using characteristics of things.
(3) additive
According to the purpose of use, plus a variety of additives.
Extreme pressure additive, the impact load and heavy load characteristics to.
Oxide additives to prevent the long time oxidation deterioration when no supplement.
And anti rust additives prevent bearing and its surrounding corrosion.
(4) viscosity
Said grease hardness levels, is 5 seconds specified metal cone weight pour fat depth (0.1mm) physical quantities, numerical is more soft.
(5) the drop point
Turning the flow state of oil after heating, started from the provisions of the hole when the temperature drops to call drop point, its value is high use temperature is higher.
(6) mixed heterogeneous oil
Tackifier and additives, changes in the nature of oil, so in principle, different kinds of oil is best to avoid mixing.
(7) enclosing the volume of oil
(8) the grease life
(9) added clearance grease
Even with the use of high quality oil, but because of the long-term use, the surrounding environment impact, the degradation performance of low grease, lubrication performance, so the need for timely as oil supplement and replacement. General 50 degrees around the operation temperature of 1 years 1 times, more than 100 DEG C even with good heat resistance of the best 1 years in exchange for 2 ~ 3 times.
Standard lubricants without specified as follows:
The basic types ofworking temperature
oil grade | lubricating grease | use range | |
chevron Chevron SRI-2 | mineral grease | -30 to 180 | high temperature resistant, water resistant |
Shell Shell Alvania 2 | mineral grease | -35 to 120 | long life, extensive use of |
Shell Shell Doliun R | stone grease | -40 to 150 | corrosion resistance, water resistance to |
collaborative Kyodo Yoshi SRL | synthetic grease | -40 to 150 | low noise, low torque |
Mobil Mobil HP | Lithium chromium synthetic grease | -30 to 110 | vibration resistance and corrosion resistance of |
DuPont Dupont Krytox240AC | fluorinated resin | -35 to 290 | high temperature resistance, good characteristics |
Esso Exxon Beacon 325 | synthetic grease | -55 to 120 | Universal grease |
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