The document discusses a linear drive called the MC200 that is capable of lifting loads of up to 200 tons (2000 kN). It has a large spindle diameter of 220mm and worm shaft diameter of 70mm. The housing is made of two parts, a cast body with internal parts prepared inside and a base plate that is fitted. A buttress-threaded spindle is used rather than a trapezoidal spindle, allowing for increased load capacity in one direction. Liquid grease is used for lubrication between friction points since the drive rarely moves and only in small lifts, requiring quick lubricant flow to points. The GROB team can provide more information on this large linear drive.

1.
Linear drives that lift 200 t
- is that possible?
GROB GmbH has been manufacturing with a great deal of know‐how in
mechanical engineering for over 70 years now and has accumulated many years
of experience in the field of linear drives. The portfolio ranges from custom
special drives to mass‐produced screw jacks. Linear drives for large‐scale
applications are rare, but that is precisely the reason why a high degree of
experience is necessary.
The MC200 is one of the very largest linear drives. With a maximum static load
of 2000 kN, this drive plays in the Champion's League.
The challenges facing the material and design engineer are extraordinary.
Technical data:
> Spindle diameter 220mm
> Worm shaft diameter 70 mm
> Unscrewing protection via square
tube
> Worm gear transmission ratio 17.5:1
> Worm gear made of wear‐resistant
bronze alloy

2.
Sägengewindespindel kann eine höhere Tragkraft, m
erreicht werden. Dabe ist das Gewindeprofil nicht
Durch den Einsatz einer
Vergleich zu TR‐Spindeln
Assembly and preparation
On account of the size of the linear drive, it is no longer sufficient to use a
ready‐cast housing. Therefore, the two‐part housing consists of a cast body and
a base plate. All internal parts are prepared in the ready‐cast body and the base
plate is then fitted.
Through the use of a buttress‐threaded spindle a higher lifting force can be
achieved compared to a trapezoidal spindle. The thread profile is not even as
with a trapezoidal thread, but reinforced in one direction. The loadability is one
direction is thus increased.
In order to ensure that there is always a film of lubricant
between the friction points, liquid grease is used and
special lubricating channels have been integrated.
According to the customer the linear drive is rarely moved
and even then only in small lifting movements. If normal
grease were to be used here, it would not flow quickly
enough to the lubrication point.
Our MC200 for loads up to 2000 kN.
Ask our GROB team for further information.