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Engineering Guide CDA3000
2-49
2 Drive definition
DE
EN
1
2
3
4
5
6
7
A
2.6.2 Characteristic
values of
standard gears
2.6.3 Characteristic
values of
planetary gears
Characteristics
Spur
gear
Flat spur
gear
Worm
gear
Bevel gear
Magnetic flux
straight
straight
rectangular rectangular
Max. torque [Nm]
approx.
15,000
approx.
6,000
approx.
4000
approx.
40,000
2nd shaft end
not possible
possible
possible
possible
Hollow output shaft
not possible
possible
possible
possible
Reduction range
(without compound
transmission)
approx.
3.5 to 230
approx.
6 to 270
approx.
6 to 290
approx.
6 to 165
Efficiency
0.93 to 0.98
0.93 to 0.98
0.3 to 0.85
0.9 to 0.96
Circumferential back-
lash in
1)
angle minutes
approx.
30 to 40
approx.
30 to 40
approx.
30 to 40
approx.
25 to 40
Reduction mathema-
tically
2)
precise?
(rating plate)
no
no
no
no
Cost DM/Nm
low
low
medium
relatively high
1)
For explanation See section 2.6.3
2)
The cogs of the cogwheel pairing have common dividers so that different cogs always
engage with each other.
Example: i = Z2/Z1 = 96/16 = 5.9375
⇒
Catalogue specification 5.94
Table 2.15
Characteristic values of standard gears
Characteristics
Standard gear
Planetary gear
Bevel gear
Gear stages
1/2/3
1/2
1/2
Efficiency
(without worm gear)
very good
very good
very good
Circumferential backlash
in angle minutes
approx. 25 to 40
1 to 10
6 - 15
Impulse torques
poor
very good
poor
Torsional rigidity
medium
very good
medium
Dynamics
medium
very good
medium
Power density
poor
very good
poor
Transmission math.
precise? (rating plate)
no
yes
yes
Cost DM/Nm
low
relatively high
medium
Table 2.16
Characteristic values of planetary gears