Type HC – Servo hypoid gearboxes


  • Gear ratios: i = 3:1 up to 15:1
  • Maximum acceleration torques on output: 2160 Nm
  • 6 gearbox sizes; centre-to-centre distance: 090 to 260 mm
  • Minimised circumferential backlash (optional)
  • Housing made of aluminium
  • Hypoid gearboxes suitable for fitting servo-motors
  • Non-positive connection between motor and gearbox

The example shows the construction type C0

The order code reflects the customer specifications.

Type Size Gear ratio Model Fixing side Installation position Speed n2 Design
HC 090 12:1 C0- 1. 1- 200 /S1
Description Size;

Table 11.4.15‑1

Table 11.4.15‑1 Figure 11.4.15‑1, Models Side on which fixing is made; Table 11.4.4-1; Figure 4.3.1-1 Gearbox sides Side directed downwards; Figure 4.3.1-1 Gearbox sides Slowly rotating shaft Low-backlash S1
V080- / 14 x 30 No. 301
Flange Motor shaft Ø

x length

Flange no.

General construction

The HC gearbox type is based on the proven type H bevel gearboxes.

The axles intersect in the gearbox at the distance A in an angle of 90°.




The edge length of the housing is reflected in the gearbox size (example: HC 090: the housing edge length is 90 mm, with the viewing direction towards the output side of the gearbox).
The housings are made of aluminium, the shaft suspension units are made of steel or casting.



ATEK hypoid gearboxes have gear sets with high-quality hypoid toothing made of hardened carburised steel.
A gear set comprises one pinion shaft (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.

On hypoid gear sets, the axial offset between pinion shaft and gear results in higher sliding motion rates in the tooth contact.
This makes it possible to achieve especially great running smoothness and a high transmission accuracy.

Construction types

Due to the modular system, different gearbox construction types can be configured.


The variants differ in the type of the shafts, the rotational direction thereof, and the possibility to use a robot flange interface (BR0 and CR0).

Threaded mounting holes

The sides 1 and 2 of the gearboxes are machined and may be used as mounting surfaces.
The flange on side 3 has also threaded mounting holes.
On the sides 5 and 6, fastening can be made via through bores.
You have the following available ordering Options:



Please enquire other mounting options.
The standard version of the mounting / fastening has the order code 9.
Example of order code: HC 090 12:1 D0 9.1

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.
Example of order code for the installation position 1: HC 090 12:1 D0 9.1

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.


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 lower noise level is generated.


The achievable efficiency depends on rotational speed, torque, installation position, sealing, and lubricant type.
The efficiency is about 95%.
The efficiency specified relates to the permissible nominal load and is a guidance value for run-in gearboxes at operating temperature with standard sealing.


The H-series gearboxes have lifetime lubrication.

Vent filter

If venting is required (B1 or C1) the gearboxes will be delivered with a vent filter.
The vent bores will be equipped with screw plugs for transport.
The vent filter will be enclosed as a separate item and must be mounted in the intended position prior to commissioning.
An elbow may be required.
Please adhere to the operating instructions!

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



Connection of drive shaft to coupling

For torque transmission, a zero-play coupling is located on the drive shaft


The coupling compensates angle errors as well as misalignments in the radial and axial direction.
A later changeover to another motor is possible. The motor-side coupling hub is available in the following variants:



Motor mounting

The servo-motor will be bolted to the motor flange of the gearbox.

The flange number of the motor flange for the respective gearbox size is to be determined in Table 11.4.14-1.

Motor flange

The motor flange adapts the mounting bores of the servo-motor and gearbox flange.
You can find the available flanges in Table 11.4.14-1.

Please contact us for other flanges.
ZK:     Diameter of centring circle
LK:     Diameter of pitch circles
L:      Length of motor shaft
d:      Diameter of motor shaft
i:      Centring height
s:      Thread
The values for the centring height (i) and the thread sizes (s) can be found on the respective pages.


Allocation: Fitting dimensions of the servo-motor – gearbox size/flange no. (selection)