What is Norm DIN 5482 Involute Spline and How to Calculate It?
Norm DIN 5482 is a German standard for involute splines, which are toothed shaft joints with curved profiles that allow for torque transmission and axial movement. Involute splines are widely used in mechanical engineering, especially in gearboxes, pumps, and motors.
In this article, we will explain what norm DIN 5482 involute spline is, how it differs from other spline standards, and how to calculate its dimensions and strength using a software tool.
norm din 5482 involute spline
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What is Involute Spline?
An involute spline is a type of spline that has a profile based on the involute curve, which is the curve traced by a point on a taut string as it unwinds from a circle. The involute curve has some desirable properties for splines, such as:
- It is easy to generate and manufacture.
- It has a constant pressure angle along the tooth profile.
- It minimizes friction and wear between mating teeth.
- It allows for some misalignment and clearance between shafts.
An involute spline consists of an external spline (male) and an internal spline (female) that fit together. The external spline has teeth that project radially outward from a cylindrical base, while the internal spline has teeth that project radially inward from a cylindrical bore. The teeth of both splines have the same involute profile, but they are shifted by half a tooth space along the circumference.
The main parameters that define an involute spline are:
- The number of teeth (z).
- The module (m), which is the ratio of the pitch diameter (d) to the number of teeth.
- The pressure angle (Î), which is the angle between the tooth profile and the radial line at the pitch point.
- The tooth height coefficients (ha* and hf*), which determine the tooth tip diameter (da) and the tooth root diameter (df) of the external spline.
- The tolerance series and zone, which specify the allowable deviations of the dimensions and the backlash or interference between the splines.
What is Norm DIN 5482 Involute Spline?
Norm DIN 5482 is a German standard for involute splines that was released in 1950. It specifies the dimensions and tolerances of involute splines with a pressure angle of 30Â. It also provides tables of standard sizes for internal and external splines with different modules and numbers of teeth.
WN10 software for involute splines according to DIN 5482
Calculation of dimensions and strength of involute spline joint
Tooth tip diameters and tooth root diameters of external and internal spline
Tooth height coefficients and profile shift coefficients
Tolerance system according to DIN 5482-3:1973 or DIN 5480-1:2006
Span width and dimension over/between pins measurement
Transferable torque or safety against permissible flank pressure
True-scale tooth profile drawings with CAD interfaces DXF and IGES
Production drawing of external spline and internal spline with ISO 7200 data field
Involute splines with a pressure angle of 30
Involute splines with a number of teeth ranging from 6 to 82
Involute splines with a module range from 0.5 to 10
Involute splines according to DIN 5482 (Release 1950)
Involute splines according to Niemann (2005)
Involute splines with self-defined non-standard dimensions
Profile database with DIN 5482 standard dimensions
Database extension and modification by the user
Tolerance series and tolerance zone selection
Backlash or interference calculation
No. of teeth meas. and pin diameter alteration
Material properties selection from integrated database
Table drawings with dimensions exportable to CAD
Tooth contact and reference profile drawings
Drawing header to DIN for production drawing
HEXAGON software for involute splines calculation
Involute splines based on reference diameters
Involute splines with major diameter fit or side fit
Involute splines with clearance fit or transition fit
Involute splines with interference fit or force fit
Involute splines with nominal dimensions and deviations
Involute splines with measuring dimensions and tolerances
Involute splines with tooth thickness allowances and backlash minimum values
Involute splines with addendum modification coefficients and form diameter corrections
Involute splines with tip relief and root relief modifications
Involute splines with tooth profile quality grades and surface roughness values
Involute splines with stress correction factors and load capacity factors
Involute splines with bending stress calculation and contact stress calculation
Involute splines with fatigue strength calculation and wear strength calculation
Involute splines with load spectra and load distribution factors
Involute splines with lubrication conditions and friction coefficients
Norm DIN 5482 differs from other spline standards, such as ISO 4156 or ANSI B92.1, in some aspects, such as:
- It uses tooth height coefficients instead of tooth thickness coefficients to define the tooth profile.
- It allows for self-defined non-standard splines by directly entering the tooth tip diameter and the tooth root diameter of both splines.
- It uses a different tolerance system based on DIN 5482-3:1973 or DIN 5480-1:2006.
How to Calculate Norm DIN 5482 Involute Spline?
To calculate norm DIN 5482 involute spline, you need to know the following data:
- The module (m).
- The number of teeth (z).
- The tooth height coefficients (ha* and hf*) or the tooth tip diameter (da) and the tooth root diameter (df) of both splines.
- The tolerance series and zone.
You can either select a standard size from the norm DIN 5482 database or input your own dimensions. Then, you can use a software tool, such as WN10 by HEXAGON[^1^], to calculate the following results:
- The pitch diameter (d), base diameter (db), addendum diameter (da), dedendum diameter (df), mean diameter (dm), outside diameter (de), and inside diameter (di) of both splines.
- The span width (E) and dimension over/between pins (M) for measuring 679def20d6