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TABLE 15.4 Recommended Oil Viscosity for Various Temperatures Recommended grade SAE 5 SAE 10 SAE 20 SAE 30 SAE 40 SAE 50 Temperature, F 50 to +50 20 to +80 +10 to +110 +20 to +130 +30 to +140 +40 to +150
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Source: Adapted from Ref. [15.6], p. 8, by courtesy of American Chain Association.
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gravity and centrifugal force to aid the flow of oil in the desired direction. The extra oil that spills over the edges of the link plates should be adequate to lubricate the bearing surfaces between the rollers and the bushings in roller and engineering steel chain. It is important to supply oil uniformly across the entire width of silent and multiple-strand roller chains. For more information, see Refs. [15.5] and [15.6]. Flow Rates. When chain drives are transmitting large amounts of power at high speeds, oil-stream lubrication generally is required. The oil stream must cool the chain and carry away wear debris as well as lubricate the drive. A substantial oil flow rate is needed to accomplish all of that. The minimum flow rate for the amount of horsepower transmitted is shown in Table 15.5.
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TABLE 15.5 Oil Flow Rates vs. Horsepower Transmitted horsepower 50 100 150 200 250 300 400 500 600 700 800 900 1 000 1 500 2 000 Minimum flow rate, gal/min 0.25 0.50 0.75 1.00 1.25 1.50 2.00 2.25 3.00 3.25 3.75 4.25 4.75 7.00 10.0
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Source: Adapted from Ref. [15.6], p. 12, by courtesy of American Chain Association.
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15.4.4 Types of Chain Lubrication All three types of chain drives roller, engineering steel, and silent will work with three types of lubrication system. The type of lubrication system used is dependent on the speed and the amount of power transmitted. The three types of chain drive lubrication systems are Type 1. Type 2. Type 3. Manual or drip Oil bath or slinger disk Oil stream
A description of each type of lubrication follows. Manual. Oil is manually applied periodically with a brush or spout can. The time period between applications is often 8 hours, but it may be longer if this is proven adequate for the particular conditions. Drip. Oil is dripped between the link plate edges from a lubricator with a reservoir. Rates range from 4 to 20 drops per minute; 10 drops per minute is equal to about one ounce per hour. A distribution pipe is needed to direct oil to all the rows of link plates in multiple-strand chain, and a wick packing in the pipe will ensure uniform distribution of oil to all the holes in the pipe. Windage may misdirect the oil droplets. If that occurs, the lubricator must be relocated. Oil Bath. A short section of chain runs through the oil in the sump of a chain casing. The oil level should not be higher than the pitch line of the chain at its lowest point in operation. Long sections of chain running through the oil bath can cause foaming and overheating. If that occurs, slinger disk type lubrication should be considered. Slinger Disk. The chain runs above the oil level while a disk on one shaft picks up oil from the sump and slings it against a collector plate. The oil is then directed into a trough which applies it to the upper edges of the chain link plates in the lower span of the chain. The disk diameter should be sized so that the disk runs at a rim speed of 600 to 8000 ft/min. Slower speeds will not effectively pick up the oil. Higher speeds can cause foaming and overheating. Oil Stream. A pump sends a stream or spray of oil under pressure onto the chain. The oil must be applied evenly across the entire width of the chain, and it must be directed onto the lower span from the inside of the chain loop. Excess oil is collected in the sump and returned to the pump reservoir. The oil stream both lubricates and cools the chain when high power is transmitted at high speeds (Table 15.5). The oil may be cooled by radiation from the external surfaces of the reservoir or, if power is very high, by a separate heat exchanger. 15.4.5 Chain Casings Chain casings provide a reservoir for the oil, contain excess oil slung off the drive, and prevent contaminants from contacting the drive. Chain casings usually are made of sheet metal, and are stiffened by embossed ribs or metal angles. Chain casings generally have doors or panels to allow access to the drive for inspection and maintenance. Oil-retaining casings have single lap joints and single oil seals at each shaft opening. They are adequate for drip or oil bath types of lubrication. They are relatively
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