Arrangement When designing roller chain drives, the centerline of both sprockets should be close to the horizontal (Figs D & E). The angle of the incline can be up to 60 degrees (Figs F & G). If installation is close to vertical, it is desirable to install an idler or a guide stopper to maintain smooth engagement of the chain and sprocket.
The following lubrication systems are suggested:
C If the centerline is vertical, install an idler which functions automatically to eliminate extr5a chain slack. If the driving shaft is on the lower side, an idler must be installed.
SYSTEM A
Manual Lubrication Oil is applied with an oil filler or brush in the gap between the pin link and roller link on the slack side of the chain. It should be applied about every eight hours or so as often as necessary to prevent the bearing area of the chain from becoming dry. Always turn off and lockout the power switch before lubricating or servicing a chain system.
Drip Lubrication A simple casing can be used. The oil is supplied by a drip feed. Each strand of chain should ordinarily receive 50 to 20 drops of oil per minute depending on chain speed.
Lubrication Lubrication increases the Service Life
One of the most important factors in getting the best possible performance out of your roller chain is proper lubrication. No matter how well a transmission system is designed, if it is not properly lubricated, it will not meet its full service life potential. Lubrication Wear between the pin and bushing causes the roller chain to elongate. These parts should, therefore, be well lubricated. The gap between the pin link plate and the roller link plate on the slack side of the chain should be filled with oil as much as possible. This oil forms a film which minimizes wear on the pin and bushing thus increases the chains service life. It also reduces noise and acts as a coolant when the chain runs at high speeds.
SYSTEM B
Oil Bath Lubrication The chain is installed in a leak-free casing. The oil depth should be ¼ to ½ inch deep. In the oil is too deep, the oil will be adversely affected by the heat generated.
Attention should be paid to the following arrangements: If the slack side is on the top, it is necessary to eliminate excessive chain slack.
SYSTEM C
A-1 When the center distance is short, chain slack should be adjusted by increasing the center distance.
Lubrication Using a Pump Use a leak-free casing. A pump is used to circulate the oil which is cooled. The number of supply holes should equal the number of strands plus 1. The amount of oil supplied to each hole should be constant.
Suggested Lubricants Only high quality oil should be used to lube roller chain. Neither heavy oil nor grease is suitable. The viscosity of the oil used will depend on the chain size, speed and temperature. See table below for more information.
A-2 When the center distance is long, the chain slack should be adjusted by installing an idler.
Chain Speed (ft/min)
Chain Number
Lubricating
A, B
C
60 and under
80-100
120-140 .53gal/min .79gal/min 1.06gal/min
160 and over
System
Ambient Temperature Range
Ambient Temperature Range
1600-2600 2600-3600
.26gal/min .53gal/min .79gal/min
.40gal/min .66gal/min .92gal/min
.66gal/min .92gal/min
Chain No. 14°-32°F 32°-104°F 104°-122°F 122°-140°F 14°-32°F 32°-104°F 104°-122°F 122°-140°F 50 or less SAE 10 SAE 20 SAE 30 SAE 40 SAE10 SAE20 SAE30 SAE40 60 and 80 SAE20 SAE 30 SAE 40 SAE 50 100 120 or more SAE 30 SAE 40 SAE 50 SAE 20 SAE 30 SAE 40 SAE 50
B If vibration occurs due to high chain speed, install a guide.
3600-4600 1.19gal/min Regardless of lubricating system, the roller chain must be washed periodically with solvent. Examine the pin and bushing after removing the chain. Any damage or reddish-brown color on the surfaces may indicate that the system is not being lubed correctly.
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