A-30
Engineering Guide CDA3000
Appendix A Formula bank
A.2.10 Efficiencies,
coefficients of
friction and
density
Efficiencies of transmission elements
Transmission
element
Characteristic
Efficiency
Wire cable
Each complete wrap of the cable reel (friction
or roller bearing supported)
η
= 0.91 - 0.95
V-belt
Each complete wrap of the V-belt pulley (nor-
mal belt tension)
η
= 0.88 - 0.93
Plastic belts
Each complete wrap; rollers on roller bearings
(normal belt tension)
η
= 0.81 - 0.85
Rubber belts
Each complete wrap; rollers on roller bearings
(normal belt tension)
η
= 0.81 - 0.85
Chains
Each complete wrap; chains on roller bearings
(depending on chain size)
η
= 0.90 - 0.96
Spindles
Trapezoidal threaded spindle
Recirculating ball spindle
η
= 0.30 - 0.70
η
= 0.70 - 0.95
Table 7.16
Efficiencies of transmission elements
Содержание CDA3000
Страница 62: ...Engineering Guide CDA3000 2 29 2 Drive definition DE EN 1 2 3 4 5 6 7 A Notes ...
Страница 315: ...A 24 Engineering Guide CDA3000 Appendix A Formula bank Movement by rack Movement by cable reel Movement by spindle ...
Страница 317: ...A 26 Engineering Guide CDA3000 Appendix A Formula bank Indexing table with eccentric loads ...
Страница 336: ...Engineering Guide CDA3000 A 45 DE EN FR 1 2 3 4 5 6 A Appendix B Practical working aids for the project engineer ...