Spring
Spring used for common railway vehicles
Axle box spring and bolster spring used for speed-upgrade railway vehicles
Axle box spring and bolster spring used for urban mass transit vehicles
Hot coil springs
Engineering machinery hot coil spring
For cylindrical helical spring, the diameter of wire is from 0.2mm through 45mm, max. Mean diameter is up to 400mm.
|
Category
|
Wire
Diameter
(mm)
|
Outside
Diameter
(mm)
|
Free
Length(mm)
|
Stiffness
(N/mm)
|
Experimental
Stress(MPa)
|
|
I
|
27
|
112.7
|
230
|
727.68
|
721.9
|
|
II
|
25.4
|
114.3
|
244.5
|
546.33
|
894.2
|
|
III
|
36.5
|
261.5
|
570.3
|
162.81
|
848.5
|
|
IV
|
55
|
245
|
643
|
397.92
|
663.5
|
|
V
|
32.6
|
170.5
|
319
|
437.7
|
688.6
|
|
VI
|
15.9
|
80.7
|
609.6
|
66
|
1042.2
|