Lubrication Recommendations Of Large Open Gears
Lubrication recommendations of large open gears
First, wear
Wear is the slow loss of material due to mechanical, chemical, or other factors lead to change gear surface. Not all the wear and tear is defined as injury, large open gears, gear early running normal wear will help to improve the equipment operating status and lubrication conditions.
A. Normal wear and tear
This wear occurs in the early stages of gear operation, rough open gear surface machining marks gradually disappeared, the teeth appear before the light state, often referred to as the running-in wear. Polished and medium wear and tear is normal wear and tear type. Therefore, the new system a large open gears or turn it over the tooth surface, Klber proposed: in the early running gear running-in process to achieve the polished, with a special run-in lubricant to quickly reduce the surface roughness and improve the contact ratio, to prevent the early damage, and to achieve good lubrication condition to create the conditions for the latter.
Two. Abrasive wear
The abrasive wear due to hard particles mixed in the lubricant (such as sand, corrosion, material, metal impurities, etc.), the relative motion of the meshing tooth surface material lost or misplaced. The tooth surface embedded hard particles can also cause abrasive wear. May take the following preventive measures:
1) in the equipment installation phase, clear the impurities of the gear pair and the gear housing;
2) the use of jet lubrication or circulation lubrication methods need to do a good job of cleaning of the lubrication system components, to avoid contamination of Sump lubrication, the need to carefully clean up the oil tank with oil components;
3) to improve the lubrication system and gear cover seal condition, to avoid external foreign matter mixed with the lubricant.
(3) excessive wear
Excessive wear due to long-term use of the lack of performance lubricants, wear resistance, high coefficient of friction, a large sliding friction makes rapid wear of tooth surfaces, so that the gear pair to reach the design life.
Excessive wear of the morphology: the gear surface was rough and lose the shape of the involute tooth profile in severe cases, usually the excessive wear of the gear along with glue, scratches and other damage, but wear faster, less prone to cracks and pitting.Excessive wear of the gear and directly related to lubricant performance. Lubricant has a viscosity of recommended suitable conditions, with extreme pressure additives, good anti-wear properties, low coefficient of sliding friction, can effectively reduce the speed of gear wear to prolong gear life.
Second, abrasions
The abrasions gear surface to put too much contact pressure, lubricant extreme pressure performance deficiencies or the tooth surface to a lack of lubricant, the lubricant film can not be established, the gear is in dry friction or boundary friction condition, the meshing tooth surface in direct contact, resulting in The removal of the gear material.
The lubrication should pay attention to the following aspects:
1) use of carrying capacity, high viscosity lubricant to improve lubrication conditions, to improve the film thickness.
2) For the protection of a sufficient amount of lubricant to reach the meshing tooth surface, take the spray lubrication, reasonable set of system parameters, avoid jet interval is too long, the amount of low lubricant in the operation of attention to prevent a lubrication system failure, if taken sump lubrication mode, need to pay attention to the level the level of routine inspections, especially when the gear centerline and the surface of oil pool has a certain slope, a high degree of attention to the oil level of high-end prevail.
Third, glued
Glue is due to the gear to withstand large contact pressure or high tooth surface temperature, resulting in the lubricant film can not be established, the peak and valley of the tooth surface uneven when in contact with local high-pressure welding, and then with the relative movement of the tooth surface, to promote node to plastic deformation and rupture, resulting in the loss and migration of the tooth surface materials. Lead to lubrication failure due to high temperature and the formation of gum and referred to as "hot glue and plastic gear contact pressure in excess of lubricating oil carrying capacity leading to lubrication failure, and known as" cold glue ".
Four, pitting and spalling
For pitting corrosion damage, need to inhibit the development of the source, ie, cracks in the operational phase of the open gear, by means of lubrication can prevent the emergence of pitting.
1) In the early stages of the gear pair is put into use, the use of dedicated run lubricants, gear quickly through the polishing process to eliminate cracks at the same time, the gear contact ratio, to prevent fatigue cracks.
2) When the gear contact ratio is increased, the switch to the high viscosity of the lubricant, the establishment of an adequate lubricant film thickness, so that the load evenly distributed, reducing the contact pressure. So, can effectively eliminate the occurrence of pitting corrosion damage, and to ease the expansion of only a little eclipse.
5, the plastic deformation
Plastic deformation of the tooth can not be restored in a shed imposed load deformation, its incentives are caused tooth received a big load. Plastic deformation of the tooth can be divided into two categories: the plastic deformation of tooth body and tooth dough change. The former is due to the tooth material by the stress exceeds the elastic limit, the latter addition to the high stress Nie and tooth friction conditions (friction material flow of the tooth surface). Open gear tooth dough change of type from the ridge.
For open gears, had a large impact load and the sliding friction is the formation of plastic deformation of the main factors to be taken to ensure that in addition to equipment installation, maintenance, installation limits and size, good lubrication conditions can ease the production of plastic deformation.
1) selection of adequate lubricant film can form lubricating oil, effectively absorb the impact when the gear engagement, reduce the load of gear to withstand the impact.
2) good lubrication to reduce friction coefficient, the lower gear by sliding friction, prevent tooth surface material flow.
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by: nicole
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