10B-1 KOBO 2m 4.3m 5m Roller Chain Simplex 5/8" 15.875mm & Connecting Links
KOBO 10B-1
5//8 15.875mm pitch simplex roller clain 22.4kN breaking strength, 0.95kg/m
3 lengths available connecting link with spring clip, crank link with split pin:-
123 links 1.952m
271 links 4.302m
319 links 5.064m
1. Roller Chain Drives
Roller Chain drives are used everywhere and especially where belt drives or gear drives are no longer suitable.
All the advantages of the belt and gear drives are united in the roller chain drive, but without the attendant disadvantages.
Roller chain drives though of robust design offer high precision and run at 98 % efficiency without slip.
They can be used over a very wide range of shaft centre distances and are tolerant in accommodating alterations in centre distance.
Their essential advantage over the gear drive is that their transmission ratio is independent of the centre distance.
2. Life of Steel Link Chains
Generally the pressure per unit of bearing area and the breaking load are the essential features for chain determination. However, because of the very large field of applications safety factors are also taken into account.
Chain life, therefore, is not dependent solely on the breaking load, but wear resistance of the round parts (pins, bushes, rollers) is of paramount importance.
Basically, every chain should be dimensioned in such a way that there should never occur a breakdown in any component part; rather the round parts should wear out gradually.
Wear in the chain joints inevitably causes extension of chain pitch, and consequently the chain wheel will no longer mesh properly.
Chain wear elongation should not exceed 3 %. In summary, the important factors having effect on chain life are correct design and calculation of the chain in relation to the operating conditions, accurate fitting and regular care and maintenance.
3. Lubrication of link chains
After assembly and inspection generally every chain is treated with a rust preventive.
Prior to starting operation all articulations must be correctly lubricated.
The field of application will determine the method of lubrication, taking into account chain speed and environmental influences.
Mineral oil SAE-30 to 50 and the following methods of lubrication are recommended for steel link chains:
Lubrications such as oil and grease should always be applied between the inner and outer link plates an the side facing the chain wheel.
Periodic cleaning of the chain to remove abrasive elements, dirt and sticky materials will prolong the working life.
In addition to the lubricants mentioned, dry lubricants may be employed for particular applications.
These are generally springled, sprayed or brushed on before chain assembly.
4. Sprockets
Chain life, of course, depends also on the correct construction and tooth form of the sprockets.
In general, the number of teeth on a driving pinion is at least 19.
Tensioner pinions and wheels used in secondary duty jobs may have a minimum of 13 teeth.
For high-speed and impulsive drives it is recommended that the teeth be heat treated to increase wear resistance. Chain wrap on the wheels should not be less than 120°, and the transmission ratio of 1:8 should not be exceeded.
The number of teeth an the sprockets and the number of links in the chain should be calculated in such a way that the same roller will not, after each revolution, engage in the same tooth gap.
In extreme cases, conveyor chains with large pitches and running at relatively low speeds will operate over wheels with a minimum of 6 teeth, due to very high polygonal action.
5. Assembly of steel link chains
Steel link chains are generally joined by connecting links.
Wherever possible, chains with an even number of links should be used, so that the individual chain length commencing and finishing with inner link can be joined by a straight connecting link.
Spring-clip to be mounted in direction of chain travel.
An uneven number of links will necessitate the use of a cranked link, which will adversely affect the chain’s breaking load and decrease it by about 20%.
When cutting continuous chain into specific lengths the outer link taken off must under no circumstance be re-used. Sprockets must be in perfect axial alignment and should be mounted as close as possible to the point of support.
Care should also be taken that the shafts are well in parallel.
As to the positioning of shafts an inclination of 60° to the horizontal is recommended.
Vertically arranged centre drives necessitate constant tension adjustment to prevent the chain from disengaging from the lower wheel.
Chain sag must not exceed 2 % of the centre distance, and should be as little as possible on impulsive drives.
Chain sag can be adjusted either by alteration of shaft centres, by retightening the tension station, or by adjusting the tensioner pinion or tension rail.
Overtightening of the chain should be avoided, since, in addition to imposing an extra load on the bearings, this will lead to quick wear and noisy running.
The tightener should have a tension adjusting movement of at least 1,5 times the pitch to allow for removal of a 2- pitch assembly.
Chain drives need no pre-tensioning.
Attention: Never grind off rivet heads or rivet chain pins without wearing protection glasses and gloves.
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