Gear units - Introduction

Type of construction

Helical gear units

  1. Foot mounted version
    Example: G02A
  2. Flange mounted version
    Example: G33C
  3. Foot-flange mounted version
    Example: G22E
  4. Double gearbox
    Example: G33G12A

Shaft mounted helical gear units

  1. Shaft mounted version
    Hollow shaft with keyway
    Example: F42A
  2. Shaft mounted version
    Hollow shaft with keyway
    Example: F53B
  3. Shaft mounted version
    Hollow shaft with shrink disc
    Rubber elements
    Example: F32BSG
  4. Flange mounted version
    Hollow shaft with keyway
    Example: F33C
  5. Flange mounted version
    Output shaft with key
    Example: F42CV
  6. Flange mounted version
    Hollow shaft with shrink disc
    Example: F52CS
  7. Shaft mounted version + side areas
    Hollow shaft with keyway
    Example: F43D
  8. Shaft mounted version + side areas
    Output shaft with key
    Example: F32DV
  9. Flange mounted version + side areas
    Hollow shaft with keyway
    Example: F42E
  10. Double gearbox
    Example: F33G12A

Helical bevel gear units

  1. Foot mounted version
    Hollow shaft with keyway
    Example: K43A
  2. Foot mounted version
    Output shaft with key
    Example: K33AV
  3. Shaft mounted version
    Hollow shaft with keyway
    Example: K53B
  4. Shaft mounted version
    Hollow shaft with shrink disc
    Torque arm T1
    Example: K53BT1S
  5. Flange mounted version
    Hollow shaft with keyway
    Example: K43C
  6. Flange mounted version
    Output shaft with key
    Example: K33CV
  7. Flange mounted version
    Hollow shaft with shrink disc
    Example: K43CS
  8. Shaft mounted version + foot area
    Hollow shaft with keyway
    Example: K53D
  9. Flange mounted version + foot area
    Hollow shaft with keyway
    Example: K33E
  10. Double gearbox
    Example: K43G12A

Helical worm gear units

  1. Foot mounted version
    Hollow shaft with keyway
    Example: S32A
  2. Foot mounted version
    Output shaft with key
    Example: S12AV
  3. Shaft mounted version
    Hollow shaft with keyway
    Example: S22B
  4. Shaft mounted version
    Hollow shaft with shrink disc
    Torque arm T1
    Example: S22BT1S
  5. Flange mounted version
    Hollow shaft with keyway
    Example: S22C
  6. Flange mounted version
    Output shaft with key
    Example: S12CV
  7. Flange mounted version
    Hollow shaft with shrink disc
    Example: S32CS
  8. Shaft mounted version + foot area
    Hollow shaft with keyway
    Example: S22D
  9. Flange mounted version + foot area
    Hollow shaft with keyway
    Example: S32E
  10. Double gearbox
    Example: S32G12A

Mounting position

GZ00E003000

Mounting face

For helical-worm and helical bevel geared motors with flange, with solid shaft or with shrink disk the position of mounting face has to be specified.

Example: Mounting face R

Direction of rotation Gear unit

The direction of rotation of the gear unit depends on the type of gear unit, the number of stages of the gearbox and for the gear units K23..K93 on the position of the mounting face.

GZ00E001000

For the bevel gearboxes K2..K9, the direction of rotation can also be selected contrary to the normal version.
In the versions hollow shaft with shrink disc and solid shaft with key a modified output shaft is required for this.
Order information in this case, i. e .: Mounting face :L, Direction of rotation as R

Efficiency of gearbox

The efficiency of the gear unit for helical gear units G, shaft mounted helical gear units F and helical bevel gear units K depends on the number of gear stages, 2-stage (0.96) and 3-stage (0.94).

The efficiency of helical worm gear units S depends on the ratio of the worm gear stage, the input speed into the gear unit and the temperature of the gear unit.

The efficiency of helical worm gear units S is shown in the selection table for gear units.

The efficiency of helical worm gear units S for back driving is significantly lower than the normal efficiency. In certain cases the worm gear unit can be self-locking.

At certain mounting positions the gearbox is completely filled with lubricant. At high input speed, mixing losses can reduce the efficiency of the gear unit.

Drive selection

Selection conditions

The following conditions must be considered in the selection of the geared motor:

T2 ≥ TA

cG ≥ fB

T2 [Nm]
Torque of geared motor (see selection table)
TA [Nm]
Counter-torque of driven machine
cG
Gear coefficient (see selection table)
fB
Application factor of driven machine

Further, the selection of the geared motor is influenced by the following factors:

Please consult the manufacturer in the case of complicated drive applications.

Application factor fB

The service factor of the driven machine is given from the shock grade, the average operating time / day and the number of switches per hour. The shock grade is given from the mass acceleration factor of the driven machine.

FJ = Jred / Jmot
Mass acceleration factor
Jred
All external inertias corrected to motor input
Jmot
Inertia (Motor)
Shock gradeFJOperating time hours/dayOperations per hour
< 1010 ... 100100 ... 200> 200
I - uniform 0 … 0.2< 8 0.81.01.21.3
8 ... 16 1.01.21.31.4
16 ... 241.21.31.41.5
II - moderate shocks0.2 … 3 < 8 1.11.31.41.5
8 ... 16 1.31.41.51.7
16 ... 241.51.61.71.8
III - severe shocks3 … 10 < 8 1.41.61.71.8
8 ... 16 1.61.71.82.0
16 ... 241.81.92.02.1
<

Radial force on gear output shaft

FR = M2 · 2000 d0 · fz

FR [N]
Radial force on gear output shaft
M2 [Nm]
Torque of geared motor (see selection table)
d0 [mm]
Effective diameter of fitted drive element
fz
Incremental factor (see table)
Transmission elementfzRemarks
Gears1.1< 17 teeth
Sprockets1.4< 13 teeth
1.2< 20 teeth
Toothed belt pulleys1.5Influence of initial pretensioning force
V-belt pulleys1.7Influence of initial pretensioning force
Flat belt pulleys2.5Influence of initial pretensioning force

The radial force determined must not exceed the permissible radial force for the gear unit.

Permissible Radial Forces for the Output Shaft