Definitions and symbols

Ring
Circlip/retaining ring with a radial width which diminishes towards the free ends, in accordance with the law of the curved beam of uniform strength, so that it deforms in a circular manner in the stressed state.


Snap rings, plain wire rings
Retaining ring with a constant radial width.


Width( (b):
Retaining ring with a constant radial width.

Thickness (s):
The thickness of the retaining ring measured in the axial direction of the shaft or housing.


A_N (mm²)
groove area
A_N = π/4 (d₁²-d₂²)

a (mm)
Radial width of the Seeger-Rings's lug

B (-)
Load factor indicating how many times the load bearing capacity of the reinforced Seeger ring is higher than that of the standard one.

b (mm)
Maximum radial width of the Seeger-Ring.

C (N/mm)
Spring rate of the axially loaded Seeger-Ring.

d₁ (mm)
Nominal dimension = shaft or bore diameter.

d₁' (mm)
Shaft diameter to which FN_nrefers.

d₂ (mm)
Groove diameter.

d₃ (mm)
Inner diameter of Seeger-Rings for shafts or outer diameter of Seeger-Rings for bores in the unstressed state.

d₄ (mm)
Centre line diameter of Seeger-Rings in the un- stressed state derived from the maximum radial space requirement a or b.

d₄₁ (mm)
Diameter d₄ during assembly over or into nominal diameter d₁.

d₄₂ (mm)
Diameter d4 fitted in the groove d2.

d₅ (mm)
Diameter of the assembly holes or corresponding semi- circular recesses.

d₇ (mm)
Wire diameter for roundwire circlips.

F_L (N)
Axial spring force of Seeger-L-Rings.

F_N (N)
Load bearing capacity of the groove
(yeald point=200 N/mm2)

F_R (N)
Load bearing capacity of the ring with sharp-corne red abutment.

F_Rg (N)
Load bearing capacity of the Seeger-Ring abutting a machine component with a chamfer, a corner distance or a radius of g mm.

F₁ (N)
Axial spring force of Seeger-W-Rings and SL washers at W₁ (maximum force).

F₂ (N)
Axial spring force of Seeger-W-Rings and SL washers at W₂ (minimum force).

f (mm)
Spring distance of Seeger- L-Rings. Axial displacement.

g (mm)
Chamfer, corner distance or radius of the machine component abutting the Seeger-Ring.

Weight (kg/1000 pezzi)
Weight of Seeger-Rings.

H (N)
Retaining force of self locking Seeger-Rings.

h (mm)
Lever arm of the dishing moment.

K (N · mm)
Value for calculating the load bearing capacity of the Seeger Ring.

L (mm)
Compensation of play of Seeger-Rings.

m (mm)
Groove width.

n (mm)
Shoulder length.

n abl (rpm)
Detaching speed of Seeger shaft rings.

n/t (-)
Shoulder length ratio.

p (-)
Correction factor taking the shoulder length ratio into account when FN is available.

q (-)
Load factor taking into account the shoulder length ratio.

s (mm)
Thickness of Seeger- Rings.

t (mm)
Groove depth.
t= ½(d₁-d₂)

u (mm)
The required reduction of L for assembly of Seeger-L-Rings.

V (mm)
Initial displacement of the axially loaded Seeger-Ring.

W_o (mm)
Curvature of Seeger-W- Rings and SL washers in the unstressed state.

W₁ (mm)
Minimum curvature of assembled Seeger-W- Rings and SL washers.

W₂ (mm)
Maximum curvature of assembled Seeger-W- Rings and SL washers.

X (mm)
Distance of the retained part from end of the shaft or housing.

ßk (-)
Fatigue notch factor of the Seeger-Ring groove