Miniature bevel gearboxes

The axles intersect in the gearbox in an angle of 90°.
Housing and cover(s) are made of aluminium.
Upon request, the aluminium parts can be anodised.
The edge length of the housing is reflected in the gearbox size (example: L 035 – housing edge length 35 mm).

Space-saving aluminium gearboxes

Miniature bevel gearboxes are highly precise and powerful lightweight gearboxes. These aluminium gearboxes cope with today’s high requirements in every respect. They are small, of low weight, and space-saving. It is not without reason that they are used worldwide, inter alia, in medical engineering. In everyday language, miniature bevel gearboxes are also known as small gearboxes.

Product features

  • Small, lightweight, space-saving, aluminium design
  • Housing made of aluminium
  • Spiral-toothed gear sets
  • Maintenance-free

Application examples

  • Metrology and test engineering
  • Microdrive technology
  • Medical engineering
  • Model manufacturing
  • Construction of jigs and fixtures


ATEK bevel gearboxes have gear sets with high-quality spiral toothing made of hardened carburised steel.
A gear set comprises one bevel pinion (small number of teeth / small diameter) and one bevel gear (large number of teeth / large diameter).

Gear sets with spiral toothing offer the advantage of very favourable engagement factors (high meshing ratio).
Therefore they are predestined for usage with high loads, combined with optimal running smoothness and high transmission accuracy.

Construction types

Due to the modular system, different gearbox construction types can be configured.
The construction types differ in:
The variants differ in type and number of the shafts, the rotational direction of the shafts and their support by bearings.

Construction type consists of:
A0 to E0 1 gear set
F0 to K0 1 gear set + 1 bevel pinion or bevel gear
Branch-off gearbox 1 gear set + 2–3 bevel pinions / bevel gears

The variants differ in type and number of the shafts, the rotational direction of the shafts and their support by bearings.

Threaded mounting holes

All 6 sides of the gearboxes are machined and may be used as mounting surfaces. All flanges always have threaded mounting holes.
You have the following available ordering Options:

Order code Threaded mounting holes are located in the housing surfaces on the gearbox side Threaded mounting holes are located in the flanges on the gearbox side
0 3, 5, 6
1, 2, 3, 4, 5, 6 1, 2, 4 3, 5, 6
9 1, 2, 4 3, 5, 6

The standard version of the mounting / fastening has the order code 9.
Example of order code: L 045 1:1 D0 9
Please enquire other mounting Options.

Installation position

The gearboxes can be used in all installation positions.
The recommended installation position is the position in which the shafts are horizontal.
These are the installation positions 1 and 2. The installation position is defined by the gearbox side directed downwards during operation and will be indicated by the corresponding gearbox side.
Please contact us for consultation if the angle of the gearbox side directed downwards deviates more than 15° from the horizontal position.

Shaft designation – allocation to the gearbox sides

The fast-rotating shaft has the speed n1 and is identified by N1.
The bevel pinion is located on this shaft.
The slowly rotating shaft has the speed n2 and is identified by N2.
The bevel gear is located on this shaft.

The gearbox sides are identified by the numerals 1 to 6.
(See Figure 4.2.1-1; Gearbox sides)



Preferred direction of rotation

If the clockwise (CW) direction of rotation (viewing direction from shaft end face of the fast-rotating shaft towards the gearbox centre) is selected, a 1 to 2 dB(A) lower noise level is generated.


The achievable efficiency depends on rotational speed, torque, installation position, sealing, and lubricant type.
With gearboxes having only one gear set, an efficiency of 97% can be achieved.
With gearboxes having several gear meshings, an efficiency of 94% can be achieved.
The efficiencies specified in the tables relate to the permissible nominal load and are guidance values for run-in gearboxes at operating temperature with standard sealing and filled with oil of viscosity grade 220.


No venting is provided for the miniature gearboxes.

Vent filter

No venting is provided for the miniature gearboxes.

Low-backlash construction

For low-friction running, the tooth space in the gear set is manufactured larger than the tooth.
When the direction of rotation is changed, this results in a rotation angle until the counter-rotating tooth flanks contact each other.
This rotation angle is called circumferential backlash.

Circumferential backlash, measuring method

The circumferential backlash is measured after the drive shaft (N1) has been fixed.
A force of around 2% of the nominal torque is applied to the output shaft (N2) in both rotational directions.
A tooth backlash will result between the two final positions. This can be measured as rotation angle and is indicated in minutes of arc [arcmin].

Circumferential backlash, type

Ordering option Gear set 1:1; 2:1 3:1; 4:1
/0000 Standard <=30 arcmin <=30 arcmin
/S2 Standard <=10 arcmin <=12 arcmin
/S1 Standard a.A. a.A.
/S0 Special gear set a.A. a.A.

Abbreviation: u.r.