Printed in the Federal Republic of Germany TR-Electronic GmbH 2007, All Rights Reserved
03/17/2021 TR-ELA-BA-DGB-0004 v16 Page 49 of 51
5.4 Required torque
5.4.1 Calculation example axial sealing
Sensor type with thread M18x1.5,
axial sealing via O-ring 23.47 x 2.62 (No scope of supply!)
A) Required locking force, dependent on the pressure on the flange
15 p = 600,0 bar static hydraulic pressure at the sensor flange
16 d_Oring = 23,5 mm O-ring-
, mounting surface
17 F_Kl = 25 957,8 N required locking force (related to hydraulic pressure)
B) Required mounting prestressing force, dependent on mounting case
18
ka = 1,6 [-]
Attraction factor for tightening with torque wrench
(
I
)
19 kl = 1,2 [-] Loosening factor for static load (II)
20 F_VM = 49 838,9 N Mounting-prestressing force, related to ka and kl
C) Thread geometry and thread friction
21 D = 18,0 mm Nominal thread diameter
22 P = 1,5 [-] Thread lead
23 D2 = 17,03 mm Pitch diameter
24 phi = 0,028 rad Thread angle
25
my_k = 0,12 [-]
Friction coefficient for thread friction
1
"leicht geölt"
(III)
26 phi_G= 0,119 rad Angle of friction, see my_k (11)
27 ra = 11,7 mm Friction radius, see O-ring- (2)
D) Required torque for p = 600 bar
28 MA = 133 Nm Calculated torque (IV)
(I) see "Maschinenelemente" (Machine elements), Roloff/Matek, table A8-11
(II) see "Maschinenelemente" (Machine elements), Roloff/Matek, table A8-9
(III) see "Maschinenelemente" (Machine elements), Roloff/Matek, table A8-12a
(IV) see "Maschinenelemente" (Machine elements), Roloff/Matek, equation 8.20
"oiled easily"
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