Rosta Self Tensioning Pivot Motor Bases
 
Motorbase - Type MB 27
 
The ideal standardized motor base for smaller belt drives with electric motors from 0.75 to 4.0 kW (frame size dimensions 90 S/L to 112 M). This base is delivered completely assembled. Thanks to its extremely compact overall dimensions, the type MB 27 can be installed everywhere without any major design changes.
 
Therefore, the MB 27 is an ideal alternative to obsolete, non-automatic tension rails. The pretensioning device with its left and right-hand thread gives a big positioning range offering an optimum adaption of the working angle to the driven pulley. All steel parts are painted with a blue primer.
 
Motorbase - Type MB 38
 
The new ROSTA motor base type MB 38 for motor frame sizes from 132 S to 160 L (3 to 15 kW) is now available on the drive component market - compact, operatorfriendly, ready for immediate installation and cost-effective. Its new features are, above all, the price, the ready-to-install design and the simplest-possible installation procedure with the new pre-tensioning device.
 
With the new horizontal aligned finethread adjusting spindle, both the pre-tension and the necessary inclination of the motor plate can be simply adjusted. The ready-to-use construction, the belt track adaptation and the fast clamping system make the MB 38 absolutely revolutionary and extremely user-friendly in comparsion with alternative and predecessor models! The frequently occurring "outside applications" in screen drives, crushers and air conditioning systems have been taken into account through the galvanisation of the components.
 
Motorbase - Type MB 50
 
The type MB 50 is the most universal self-tensioning base for all friction belt drives with 7.5 to 45 kW electric motors (frame size dimensions 160 M S to 225 M). The standardized base plate can be installed on the rubber spring either "centered" or "off-set" according to the position of the driven pulley. The belt pretension can be continuously settled equivalent to the belt size and quantity.
 
Highlights: The new motor base type MB50 has 2 internal cardanic bushings, powerful front side pre-tensioning device(s) as well as a bolt retainer for easy and safe fixation.
 
Motorbase - Type MB 70
 
The ideal standardized motor base for heavy duty belt drives with electric motors from 37 to 200 kW (frame 250 M to 315 S). This motor bases is available in four different lengths, according to the relevant motor size. The pretensioning device can be attached in 11 different positions, allowing to incline the base plate according to the ideal working angle. The belt pretension can be continuously settled, equivalent to the belt size and quantity. All steel parts are painted with a blue primer.
 
Motorbase - Type MB 100
 
The self-adjusting universal Motor base for friction belt drives with drive power in the 90 kW to 250 kW range (motor frame sizes 315 M to 355 L or NEMA frame sizes 449T and 586/7 = 200-350 HP).
This heavy-duty motor base is supplied fully assembled and ready for use. The two-part motor plate includes as a standard feature the mounting holes for all the motor frame sizes listed above.