Type VC – Servo bevel gearboxes

Features

  • Gear ratios: i = 1:1 up to 6:1
  • Maximum acceleration torques up to T2B = 700 Nm
  • 6 gearbox sizes with edge lengths of 065 up to 200 mm
  • High efficiency
  • Minimised circumferential backlash (optional)
  • Bevel gearboxes suitable for fitting servo-motors
  • Zero-play three-piece claw coupling
CONSTRUCTION TYPES
GEARBOX SIDES
ORDER CODE

The example shows the construction type C0

The order code reflects the customer specifications.
Example:

Type Size Gear ratio Model Fixing side Installation position Speed n2 Design
VC 065 2:1 C0- 1. 1- 1500 /KN
Description Size;

Table 11.3.15‑1

Table 11.3.15‑1 Figure 11.3.15‑1, Models Gearbox side on which fixing is made; Table 11.3.4‑1 Side directed downwards; Figure 4.3.1-1

Gearbox sides

Slowly rotating shaft; Table 11.3.15‑1 Clamping hub
V080- / 14 x 30 No. 301
Flange Motor shaft Ø

x length

Flange no.

 

 

General construction

The VC gearbox type is based on the proven type V bevel gearboxes.
The edge length of the housing is reflected in the gearbox size (example: VC 120 – housing edge length 120 mm).

Toothing

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

Threaded mounting holes

All 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:

 

TABELLE FEHLT!!

 

The standard version of the mounting / fastening has the order code 9.
Please enquire other mounting options.

Installation position

The installation position is defined by the gearbox side directed downwards during operation and will be indicated by the corresponding gearbox side.
The gearboxes can be used in all installation positions.
The technically most favourable and thus recommended installation position is the position in which the shafts are horizontal.
These are the installation positions 1 and 2.

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.

templ_typ_vc_getriebeseiten_02_x2_euro

Efficiency

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.

Lubrication (abbreviation code)

You can find the itemisation in the example: VC 090 1:1 C0 -9.9- 2000/B0
Here, B0 has the meaning:

They will be reflected in the type designation.
You can find the itemisation in the example: V 090 1:1 C0 – 1.1 -1000 /B0
Here, /B0 has the meaning:

 

TABELLE FEHLT!!!

templ_abb_schmierung_01_x2_euro

templ_abb_schmierung_02_x2_euro

TABELLE FEHLT!!!

 

Depending on the gearbox size, injection lubrication may be necessary in case of high rotational speeds.
In case of very low rotational speeds, lubrication by fluid grease is also possible.
At operating temperatures over 50°C, high pressure will develop through air expansion in the gearbox.
Then a permanent pressure compensation must be ensured.
To this end, the use of a vent filter is prescribed.

 

TABELLE FEHLT!!

 

 

 

 

 

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 (included in the delivery) may be required.
The position will be specified in the order documents.
Please refer to the following table for the position of the filter.
Here, E4, for example, means: Venting on side 4.

templ_abb_einbaulage_x2_euro

Low-backlash construction

For optimal 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

All ATEK bevel gearboxes can be delivered as low-backlash types.

 

TABELLE FEHLT!!!

Abbreviation: u.r.
– upon request

 

Connection of drive shaft to coupling

For torque transmission, a space-saving, zero-play connection in the form of a cone is implemented in the drive shaft.
In case of extreme overloads, this non-positive connection is cut, thus preventing damage to the motor-side and gearbox-side elements.
After an overload, our service department must be contacted.

Coupling

Two congruent coupling halves are positively connected by means of a plastic toothed ring under pretensioning.
In case of extreme peak tensions and impact loads (emergency shut-off), a damping action is achieved through a slight distortion in the elastic range.
The coupling is axially insertable and compensates angle errors as well as misalignments in the radial and axial direction.
A later changeover to another motor is easily possible.
The motor-side coupling hub is available in the following variants:

 

TABELLE FEHLT!!

 

Depending on the variant KN or KNN/SN, different torques can be transmitted.

Design of the coupling

Due to the dynamic characteristics of the servo-motors, the permissible acceleration torque and the emergency-stop torque must be considered when designing the servo gearboxes.
The correct coupling hub can be selected by means of the table below on the basis of the maximum permissible torques on the motor shaft, acceleration torques (T1B) and emergency-stop torques (T1Not).
These values must also be permissible on the gearbox!

 

TABELLE FEHLT!!

 

 

 

 

Motor mounting

The servo-motor will be bolted to the motor flange of the gearbox on side 3.
The flange number of the motor flange for the respective gearbox size is to be determined in Table 11.3.14-1.

Motor flange

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.

templ_typ_vc_motoranbau_01_x2_euro

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

 

TABELLE FEHLT!!

 

 

Type overview

160 - 200 mm