U.S. TSUBAKI FREE FLOW CHAIN
ENGINEERING INFORMATION
Table 4 f 2 : Coefficient of Friction between Chain and Conveyed Object when Accumulating
■ Use of Chain Guide
Type of Roller on
Chain Type
Base Chain
Dry Lubricated
Regular type
0.10 0.15 0.06 0.10 0.09 0.06 0.09
– – –
DOUBLE PLUS ® Chain
High friction type
Plastic outboard roller Plastic brake outboard
Outboard Roller
Chain
roller
–
Steel outboard roller
0.06
Plastic top roller
–
Top Roller chain
Steel top roller
0.06
Note: These factors are for your reference only.
Note: 1) When using plastic brake outboard roller chain, the rollers of the base chain on the return side should be supported by the rail in the same way as the conveying side. 2) When using Poly-Steel chain with outboard rollers, the guide should support the bottom surface of the links.
Table 5 f 3 : Coefficient of Friction between Chain and Rail when Accumulating
Type of Roller on
Chain Type
Base Chain
Dry Lubricated
Table 7 Maximum Allowable Chain Tension
(lbs.)
Regular type
0.20 0.25
– –
DOUBLE PLUS Chain
High friction type
Type of Roller Chain on Base
Note: For all chains except the DOUBLE PLUS Chain, f 3 equals f 1 . These factors are for your reference only.
RS40 RS50 RS60 RS80 RS100
type
Chain C2030 C2040 C2050 C2060 C2080 C2100 Regular type 120 200 310 460 1,190 – High friction type 60 100 155 230 595 – Stainless Steel type 60 100 155 230 595 –
Table 6 Chain Speed Coefficient
DOUBLE PLUS ® Chain
Chain Speed ft./min.
Chain Speed Coefficient (K)
0 50 50 100 100 160 160 230 230 300 300 360 360 400
1.0 1.2 1.4 1.6 2.2 2.8 3.2
Steel roller type Steel roller
220
350
550
840
–
–
Note: These factors are for your reference only.
–
595
970 1,410 2,400
3,835
Outboard Roller Chain
Plastic roller
Suggested chain speed is as follows: DOUBLE PLUS Chain: 50 ft./min. or less Plastic Roller Chain: 230 ft./min. or less Poly-Steel Chain: 230 ft./min. or less When chain speed exceeds the above, consult U.S. Tsubaki.
–
100
155
230
400
575
Poly- Steel Steel roller
–
100
155
200
–
–
Top Roller Chain
–
595
970 1,410 2,400
3,835
(single strand)
Plastic roller
–
100
155
230
400
575
6) Determination of Chain Size Multiply the maximum chain tension (T) by the chain speed coefficient (K) listed in Table 6 and verify with the following formula. T • K Maximum allowable chain tension Note: Where there are two matched strands, the maximum chain tension should be T • 0.6 Maximum allowable chain tension. ■ Ambient Temperature Range Suggested ambient temperature range is between 14°F and 140°F, for which standard lubrication is suggested. Special lubrication is required for temperatures between 140°F and 300°F. For temperatures above 300°F, please consult U.S. Tsubaki.
Table 8 Coefficient of Friction
DOUBLE PLUS “VR” Steel Roller
Double Pitch DOUBLE
Large size
PLUS steel roller
DOUBLE PLUS
Coefficient of Friction
Non-
Non-
Lubrication lubrication Lubrication lubrication
Coefficient of friction f 1 between chain and rail when conveying
0.05
0.05
0.05
0.05
Coefficient of friction between chain and con-
f 2 veyed object when accumulating Coefficient of friction f 3 between chain and rail when accumulating
0.10
0.15
0.10
0.15
0.10
0.25
0.05
0.15
Note: • These factors are for your reference only.
• We suggest lubricating steel roller and VR type chains.
B-57
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