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FAQ Dish springs

To calculate saucer springs, the coefficients must first be calculated.

After this, calculate the deflection.

Then the spring constant

The detailed explanation is in our blog.

We always recommend asking an expert to check the calculations. At TEVEMA, we have a tool for this.

Dish springs are placed in four different ways.

1. A single dish spring

2. Parallel stacking

3. Series stacking

4. Parallel stacking in series

The tolerances on poppet spring force is down to mainly the group the poppet spring is in:

Group Thickness in mm: Toller force in %:
Group 1 < 1.25 +25% / -7.5%
Group 2 1.25 to 3.0 +15% to -7.5%
> 3.0 to 6.0 + 10% / – 5%
Group 3 > 6.0 to 16.0 +5% / – 5%

The tolerances on platter spring height is down to mainly the group the platter spring is in:

GroupThickness in mm:Tollerance height in mm:
Group 1< 1.25+0.1 / -0.05
Group 21.25 to 3.0+ 0.15 to -0.08
> 3.0 to 6.0+ 0.2 / – 0.1
Group 3> 6.0 to 16.0+0.3 / – 0.3

See the complete overview of tolerances on DIN 2093 saucer springs.

GroupThickness in mm:Toller force in %:
Group 1< 1.25+25% / -7.5%
Group 21.25 to 3.0+15% to -7.5%
> 3.0 to 6.0+ 10% / – 5%
Group 3> 6.0 to 16.0+5% / – 5%

The tolerances on poppet spring thickness is mainly down to the group the poppet spring is in:

GroupThickness in mm:Tollerance in mm:
Group 10.2 to 0.6+0.02 / -0.06
> 0.6 to < 1.25+ 0.03 to -0.09
Group 21.25 to 3.8+ 0.04 / – 0.12
> 3.8 to 6.0+ 0.05 / – 0.15
Group 3> 6.0 to 16.0+0.10 / – 0.10

 

Series C has the following parameters:De/t= 48 andHo/t= 1.3

TheDe is the external diameter of the saucer spring.

The t is the thickness of the steel.

TheHo is the free length in the circle of the saucer spring.

Have saucer springs conforming to series B:

Series B:De/t= 28 and aHo/t= 0.75

TheDe is the external diameter of the saucer spring.

The t is the thickness of the steel.

TheHo is the free length in the circle of the saucer spring.

Disc springs from group 2 have a material thickness of 1.25 to 6 mm.

Disc springs from Group 1 always have a steel thickness of <1.25 mm.

The load/deflection curve of a single plate spring is not linear. Force formation depends on the ratio of height to thickness. If the ratio is small (0.4 series A), the feature is almost a straight line. The load deflection becomes increasingly curved as the ratio h0/t increases.

Up to a ratio of 1.5, saucer springs can be safely pushed into the flat position.At a ratio of 1.5, the curve is flat for a significant deflection range. This is a useful consideration for in wear compensation.

Above 1.5, the saucer spring shows increasingly regressive characteristics and is capable of pushing through and therefore must be fully supported. For ratios greater than 2, the saucer springs may reverse when brought to the flat position.

Disc springs from Group 3 have a material thickness of >6 mm. These saucer springs are only available via custom-made saucer springs from Tevema.

Series A saucer springs have a:

External Diameter / Thickness steel = 18 (or smaller) & Free length / Thickness steel = 0.4

There are three groups of saucer springs. Named:

1. (1)

2. (2)

3. (3)

All three groups have three series. Named:

Series A

Series B

Series C

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