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Volute

VOLUTE SPRING

Feature

In case of the volute spring, when the shaft load works at the bottom, the load increases almost in straight line, along with transformation, and the sheet at the bottom (which has a big diameter) contacts the left side in order. After contacting the left side, this sheet doesn't work as spring any longer so load rapidly increases against displacement at over a certain load, Because of this characteristic, the spring can be protected from excessive load so it is mostly used for the part that receives big load in small place. In addition, this spring can make an effect of reducing vibration caused by friction between sheets. The stress of the volute spring is caused mostly by distortion of the sheet, The stress by the sheet's curvature is considered, which influences the stress distribution on the spring so the fatigue life can be small,

Usage

For nuclear power plants, safety valves, shock-absorbers of large industrial equipment, control valves, shock-absorbing springs in hydraulic cylinder, rolling stand and shock-absorbers to stand big load in small space

Load
KS(Korea) Standards JIS(Japan) Standards DIN(Germany) Standard
SPS 3 SUP 6 51 Si 7
SPS 6 SUP 10 50 Cr V4
SPS 5 SUP 9 50 Cr 3
  • Any other material than described above can be used for special purposes.
  • Any other material than described above can be used for special purposes
Specification
Records of Specification in Ordering Volute Spring
Classification Special Requirements Remarks
Material in use Ordinary SUP 10 Choose the material based on the manufacturer's
standards unless specified otherwise
Thickness of
spring material (c)		 mm
Width of
spring material (b)		 mm
Inner diameter of
spring (d)		 mm
Outer diameter of
spring (D)		 mm
Free height of
spring (H)		 mm
Total no. of
spring turns (Nt)		 Vol
Designation of
spring features		 Height Load Shall be based on the manufacturer's reference value features
mm kgf in case there is no designated height and load
mm kgf
Surface management
after molding 		Short peening
Surface treatment Black Coating Treatment with rust preventive oil is possible upon request
Use or conditions for
Record of Use		 Record of use
Conditions		 Indicate use, temperature in use,
humidity and environment for use.


Allowable ErrorA. External & Internal Error
Spring Internal Diameter(D) Tolerance Spring External Diameter(Di) Tolerance Spring Free Height(H) mm
~ 25mm + 2 / - 2 ~ 50mm + 2 / - 2 ~ 100mm + 5 / - 5
25 ~ 50mm + 3 / - 1 50 ~ 100mm + 3 / - 4 100 ~ 200mm + 7 / - 5
50 ~ 70mm + 4 / - 2 100 ~ 150mm + 4 / - 6 200 ~ 250mm + 10 / - 5
70 ~ 90mm + 5 / - 3 150 ~ 200mm + 6 / - 8 250 ~ 300mm + 10 / - 10
90 ~ 110mm + 6 / - 5 200 ~ 250mm + 8 / - 10 300 ~ 350mm + 10 / - 10
110 ~ 150mm + 10 / - 5 250 ~ 300mm + 10 / - 15 350 ~ 400mm + 15 / - 15
300mm + 15 / - 20 400mm + 20 / - 20