The lubricating oil used for the base oil is explained in "4. Oil lubrication" further down this column.The thickener disperses throughout the base oil (lubricating oil) and makes it semi-solid, preventing the base oil from spilling out.The additives complement the performance needed for the purpose of use.With grease lubrication, when the bearing rotates the base oil gradually oozes out and lubricates the bearing.

The kinematic viscosity of lubricating oil changes depending on the temperature (see Figure 6). For this reason, consider the temperature during operation when you select the lubricating oil.

This is a method of operating the machine by immersing the bearing in lubricating oil. It is suitable for low- to medium-speed rotation.

Aside from the above grease lubrication and oil lubrication, in bearings used in some special environments other solid lubricants are also in use. For information on these, see the following.

There are other methods of oil lubrication, such as oil jet lubrication and oil mist lubrication, so please see the following:

This is a method in which gears, etc. are attached to the shaft, the lubricating oil is splashed, and it is made into droplets for oil supply. This method can be applied at relatively high speeds.

In order to prevent this friction and wear, oil or some other substance is applied between the contact regions. This is called "lubrication." With the appropriate lubrication, an oil film makes it so that the rolling elements and bearing rings do not come in direct contact. This results in less friction and a massive decrease in wear. (See Figure 2.)

Best lubricant forbearings

Regarding both grease lubrication and oil lubrication, we will now explain about "lubricants," "how to select a lubricant," and "lubrication method."

Generally, mineral oil--which is a refined crude oil and suitable for lubrication--is used as lubricating oil. However, mineral oil has the disadvantages that it oxidizes at high temperatures and its lubricating function deteriorates, and that at low temperatures its viscosity increases and the force required to stir the lubricating oil (the "stirring resistance") increases. For this reason, we use synthetic oil that has excellent lubricating function in high temperature or low temperature (see Table 6). Additives are added to the lubricating oil to improve certain characteristics (preventing oxidation, rust, foam, and so on).

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The surfaces of bearing rolling elements and rings (inner ring and outer ring) are finished extremely smooth. But however smooth they are their surfaces still have unevenness.

What is the best lubricant for ballbearings

Bearings aim for stable and smooth rotation, and to do that the friction with rolling motion needs to be reduced and the abrasion of the various components needs to be prevented. "Lubrication" plays a major role in this process. It is important to choose the appropriate lubricant and lubricating method in order to allow the bearing to rotate stably over a long period of time.

The main components of grease are base oil (lubricating oil), thickeners, and additives, and the components and amounts of these are adjusted and blended according to the purpose of use (see Table 4).

Below is an explanation of the lubricating methods used to allow the bearing to rotate stably over a long period of time.

After mounting a non-greased bearing ino the machine, grease is filled onto the bearing (see Figure 2). Grease supplied through the grease nipple is filled into the grease sector inside the housing, flowing into the inside of the bearing. Used grease is pumped out of the bearing and ejected out of the housing by the centrifugal force of the rotary disc attached to the grease valve.

In Part 6, we will explain about bearing lubrication as a measure for whether the bearing type you chose was appropriate.

Because grease is semi-solid, it tends not to leak out and can be easily affixed to the inside of the bearing. Since this makes it convenient as a sealing device, grease lubrication is widely applied for bearings.

The major types of bearing lubrication are: grease lubrication, which uses semi-solid (i.e., like cream) grease; and oil lubrication, which uses lubricating oil.

On the other hand, lubricating oil with high kinematic viscosity is thick, the lubricating oil film being strong. It is used in bearings to which a heavy load is applied. However, if the kinematic viscosity is too high, the viscosity resistance of the lubricating oil will cause a large amount of heat to be generated.

What's the Structure of the Bearing? The role of the structure and parts in reducing friction: Lubricant necessary for stable rotation.

Types of lubrication in bearing

As the primary methods of grease lubrication, allow us now to look at grease-packed bearings (wherein grease is filled inside the bearing in advance ) and the feeding method.

Bearing lubrication oil

On the other hand, oil lubrication is more effective as a lubricant than grease lubrication, and so is used in situations where such factors as high-speed rotation, a large cooling effect, or dirt filtering are required (see Table 3).

Lubricating oil is dripped from the oiling device and the effect of the rotating part causes the lubricating oil to mist and fill the housing. This has a cooling effect. This method can be applied at relatively high speeds and mid-level loads.

Grease-packed bearings are bearings that are sealed by the bearing manufacturer using a shield or seal after inserting the necessary grease into the inside of the bearing (see Figure 3).

Bearing lubrication chart

When a bearing rotates, the convex regions of the bearing rings and the rolling elements come in contact with each other. This contact between the convex regions leads to friction and wear, inhibiting the smooth rotation of the bearing. (See Figure 1.)

High Speed Bearing Oil

Lubricating oil with low kinematic viscosity is smooth, the lubricating oil having little resistance. It is used in bearings that rotate at high speed. However, if the kinematic viscosity is too low, there will be insufficient formation of the lubricating oil film, and the lubricating effectiveness will be decreased.

Select the lubricating oil with the appropriate viscosity for the operating temperature of the bearing. First we select the lubricating oil with the proper kinematic viscosity for the type of bearing (see Table 7).

In order to select the most appropriate lubricating method from among the many methods of oil lubrication, consider the operating condition, usage criteria, and cost.Allow us to explain about the four most common methods of oil lubrication.

This is a lubrication method in which the lubricating oil is inserted inside the bearing, then cooled, and then circulated again. It is most commonly applied in high-speed rotation or high-temperature conditions.

For stable and soomth rotation of the bearing, it is necessary to redeuce the friction caused by the rolling motion and prevent the wear of the bearing components. "Lubrication" plays a major role in this process.

Home Forums Post Viet-Nam to Desert Storm Vehicles 5-ton and up JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. SKF Brakemaster Turbo 2000 Air Dryer Thread starter Buffalobwana Start date Jun 24, 2019 ••• More options Who Replied? Jun 24, 2019 #1 Buffalobwana Well-known member Steel Soldiers Supporter 1,394 178 63 Location Frisco Texas Wes, you mentioned this dryer in a post last year, said you were going to try it out. Did you ever install one on your truck? My stock one took a dump on me, debating rebuilding or replacing with this. Thanks.   Jun 24, 2019 #2 simp5782 Feo, Fuerte y Formal Supporting Vendor 12,131 9,418 113 Location Mason, TN Buffalobwana said: Wes, you mentioned this dryer in a post last year, said you were going to try it out. Did you ever install one on your truck? My stock one took a dump on me, debating rebuilding or replacing with this. Thanks. Click to expand... https://www.steelsoldiers.com/showt...TV-Air-dryer-replacements-upgrades&highlight= I have 2 on my truck. Be sure the one you buy has a yellow sticker on it and not red   Jun 26, 2019 #3 TEAMJENSEN Member 50 0 6 Location NJ I installed it as well and it works great Sent from my SM-G950U using Tapatalk   Jun 26, 2019 #4 Buffalobwana Well-known member Steel Soldiers Supporter 1,394 178 63 Location Frisco Texas Thanks Wes. I bought one today, yellow sticker, 24v.   Jun 26, 2019 #5 Buffalobwana Well-known member Steel Soldiers Supporter 1,394 178 63 Location Frisco Texas TEAMJENSEN said: I installed it as well and it works great Sent from my SM-G950U using Tapatalk Click to expand... Thanks. I take it the plumbing and wiring was straightforward?   Jun 26, 2019 #6 simp5782 Feo, Fuerte y Formal Supporting Vendor 12,131 9,418 113 Location Mason, TN Yes. You just plug off the purge tank port on the dryer. The only thing about the dryer I dont like Is that it has a loud purge off. It will scare you   Jun 26, 2019 #7 TEAMJENSEN Member 50 0 6 Location NJ Buffalobwana said: Thanks. I take it the plumbing and wiring was straightforward? Click to expand... Yes Sent from my SM-G950U using Tapatalk   Jul 6, 2019 #8 Buffalobwana Well-known member Steel Soldiers Supporter 1,394 178 63 Location Frisco Texas TEAMJENSEN said: Yes Sent from my SM-G950U using Tapatalk Click to expand... Having an issue with wiring. Me and electricity aren't best friends, so, I think its best to ask. From the Dryer, P1 is power, J1 is ground. On the truck there is a black wire and a white wire. I cut this wire off the old dryer. Figure black is probably ground. I put my multimeter on each wire, and the frame, with the truck off and they both registered the same. suggestions?   Jul 6, 2019 #9 simp5782 Feo, Fuerte y Formal Supporting Vendor 12,131 9,418 113 Location Mason, TN Buffalobwana said: Having an issue with wiring. Me and electricity aren't best friends, so, I think its best to ask. From the Dryer, P1 is power, J1 is ground. On the truck there is a black wire and a white wire. I cut this wire off the old dryer. Figure black is probably ground. I put my multimeter on each wire, and the frame, with the truck off and they both registered the same. suggestions? Click to expand... The ground is usually right there near the dryer on the frame rail with a 3/8 bolt thru it.   Jul 7, 2019 #10 Buffalobwana Well-known member Steel Soldiers Supporter 1,394 178 63 Location Frisco Texas Thanks. Got it done. This didn't turn out to be a straight swap out. Bolt holes were about 2” narrower on the SKF, so I needed to drill 2 new holes to match up with the SKF. The fittings didn’t fit either. One of the 1/2” fittings worked out (the 90 degree inlet) but I needed reducers and adapters for the out and governor line port. The wiring was simple enough, but found out my multimeter doesn’t work. Couldn’t even get continuity on a ground wire. I fired it up, and got that beautiful purge sound after a few minutes.   You must log in or register to reply here. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Link Home Forums Post Viet-Nam to Desert Storm Vehicles 5-ton and up

Greases of different brands should not be mixed.The grease's characteristics may change and cause damage to the bearing.

The primary purpose of lubrication is to reduce friction and wear, but there are also other reasons for lubrication (see Table 2).