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Lubrication of Chains

Lubrication of Chains. The Chain. is one of the eldest traction and drive components, consisting of individual links gripping movable into each other. Open link chains – functioning without lubrication. stud-link or anchor chain. normal open-link chain. caterpillar-type drive chain

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Lubrication of Chains

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  1. Lubrication of Chains

  2. The Chain is one of the eldest traction and drive components, consisting of individual links gripping movable into each other.

  3. Open link chains – functioning without lubrication stud-link or anchor chain normal open-link chain caterpillar-type drive chain (similar to track chains)

  4. Base of the Chain Lubrication They never can work in the ideal state of hydrodynamic friction but always in the critical areas of boundary friction and mixed friction (see Stribeck diagram). High loads restricted on linear surface contacts and no rotational motion but angular motion only prevails! Speciality lubricants are of especial importance for the use at chains. Therefore : All other Chains need an optimal Lubrication!

  5. Link ChainsMakes and Shapes Load chains Drive chains

  6. Load Chains Liner chains Fly-frame chains (without chain sprockets)

  7. Drive Chains Roller chains Bush chains Rotary chains

  8. Construction of roller chains Bushing Pin Roller Side bar or plate

  9. Types of Drive Chains Single-row roller chain Double-row roller chain Triple-row roller chain

  10. Types of Conveyor Chains Single row chain Double row chain Triple row chain

  11. Failures and their Reasons Stiff Joints Noise After leaving the sprocket wheel the chain does not get back to its stretched length. Reasons are cold seizing, corrosion of the joint or residues of unsuitable lubricants, caused by insufficient or wrong lubrication. Inadequate lubrication causes metallic friction which effects grating and squeaking. Rust on Surface and Joint Broken Pins and Side Bars Reasons are inadequate lubrication or insufficient corrosion protection. The reason is often overloading or corrosion in the chain joint Elongation of Chains Dirtiness Already with a 3% elongation, the sprocket has no more chance to gear in perfectly. Even with optimal lubrication, chain stretching will occur after long operation time. However with an adequate lubrication the lifetime is 60 times longer than at dry running At heavily soiled chains the oil only can partially and not completely penetrate into the chain joints.

  12. Dependence of Wear, ChainElongation and kind of Lubrication 3 1 2 3 2 4 Chain elongation [%] 1 5 0 Service time [h] Graph 1:Dry running, excessive wear, destruction of chain in very short time. Graph 4:Inadequate lubrication, irregular wear due to inferior, dirty, non-suitable or too small quantity of lubricant. Graph 2:Lubrication only once a time, delay of wear occurrence until lubricant is used up. Graph 5:Perfect lubrication, strongly reduced wear, enhanced safety for long service life of the chain. Graph 3:Irregular lubrication, temporary dry running by hand lubrication if relubrication schedule is not followed.

  13. Ways of Lubrication Depending on the speed of the chain v [m/s] Pump lubrication Slash lubrication Drip lubrication Hand lubrication

  14. Hand Lubrication Lubrication by oil can or brush is a very unsure method. It is not useful for continuous operation and therefore only suitable for driving units of minor importance and slow chain speeds.

  15. Drip-feed Lubrication Lubrication by wick, needle or drip oiler is suitable for driving units with low stress. In order that the lubricant will attain the linkages, the dripping pipes outlets have to be placed above the pin row.

  16. Splash Lubrication in Oil Bath A chain protection case has a soundproofing effect. Its dimension should be such big, that the elongated chain does not beat against the walls. The chain pins should immerse into the bath not more than to the rollers or bushings. At the oil bath there is no loss of the lubricant.

  17. Forced-feed circulatory Lubrication Used for fast running chains and subject to high loads. Oil feeding may be carried out by connecting it to an already installed pressure oil pipe or a pump. The oil spurts from the pipe on the whole width of the chain on the inner side of the pulling strand and in direction of the course.

  18. Requirements on the Lubricant Lubricating performance Wear protection Penetrative and clearance fitting ability Noise suppression Corrosion protection Adhesive ability Temperature stability Resistance to media Food grade property Environmentally safe

  19. Service Temperature rangeof OKS Products with MoS2 with MoS2 + Mox - Active with white solid lubricants + Mox -Active with Mox - Active with graphite with graphite

  20. Thank You for Your Attention

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