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Tensioning

Belt Drive Tensioning

Belt drives rely on adequate tension to efficiently and reliably transmit power. Correct tension needs to be initially applied and maintained to compensate for wear and elongation. Incorrect belt drive tension is a major driver of reliability issues and maintenance down time and reduced efficiency. 
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Automatic belt drive tensioning with ROSTA MB Motorbases or ROSTA SE tensioners provides maintenance-free and simple to install solutions for high-efficiency and reliable drives. 
Product information
Download our product catalogue for technical product information, a in-depth technology overview and more, or get in touch with our sales department to have a consultation on how ROSTA can help you.
product selection tool
ROSTA STANDARD MOTORBASE SELECTOR

Motor Type

Motor Frame Size

Selection tool recommendations are general in nature and may not be suitable for specific applications and installations. Consider the comprehensive product data and guidelines provided in the ROSTA catalogue and other resources. For further assistance, contact your local ROSTA representative
Max. Motor RPMMax. Motor PowerROSTA Motorbase
1000 RPM 0.75 kW ROSTA MB 27 x 120
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Type MB 27
mb38-calculator
Type MB 38
mb50-calculator
Type MB 50
mb75-calculator
Type MB 75
mb100-calculator
Type MB 100

Comments:

Larger Motorbases available, please contact ROSTA for details.

product selection tool
Tensioner Selector for V-belt Drives

Unit selector

Belt Type

Diameter of Smaller Pulley

Number of Belts

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For full product specification or for tensioner types not listed above, please download ROSTA's "Tensioning Devices" catalogue or get in touch with a ROSTA representative.
Selection tool recommendations are general in nature and may not be suitable for specific applications and installations. Consider the comprehensive product data and guidelines provided in the ROSTA catalogue and other resources. For further assistance, contact your local ROSTA representative
Initial Static Belt Deflection Force Minimum Tensioner Force ROSTA Recommended Tensioner Force
20 N/belt 20 N 40 N
types
90-02102018-050145

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.

see details

90-26092018-032470

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.

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90-26092018-034650

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.

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90-02102018-049270

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.

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90-02102018-050010

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.

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90-21092020-043792

Type MB 75

The MB75 features a single, centred pre-tensioning device for easy handling (like the MB100). The hole pattern of the motor plate is equal to the pattern of the baseplate. This enables a previously fix installed motor onto a MB75 without extra efforts. Furthermore, the side plates of the MB75 incorporate extra openings for easier handling during installation.
All three sizes of the MB75 feature a 100 mm offset position of the motor plate, a compact height of 315 mm, galvanized surfaces, the blue painted ROSTA rubber suspension element as well as several labels with information for adjustment procedures, product name and traceability. A QR code stands for getting additional product information.
If no other units are specified, the numbers given are in mm.

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90-29102018-039785

Type SE

The tensioning element with the specification SE (SE 11 to SE 50) is the mostly used standard unit for tensioning of all kind of chain and belt drives. The elastomeric inserts are based on a high elastic natural rubber with a good shape memory. This unit is designed for applications in temperatures from -40° to +80°C (-40° to +180°F)

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90-29102018-039970

Type SE-B

The ROSTA tensioning element type SE-B (Boomerang) compensates the slack in extremely long chain drives. The Boomerang with its bended double arm, equipped with two sprocket wheels, offers a triple compensation of the slack.

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90-29102018-040048

Type SE-F

The ROSTA tensioning elements type SE-F is designed for front mounting applications on "blind" frame structures. Rubber quality, tensioning pressure, material and surface protection are identical to the type SE. The special fixation screw with distance bushing is zinc-plated and secured in the housing by means of a rubber 0-ring.

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90-29102018-040219

Type SE-FE

The ROSTA tensioning element type SE-FE is designed for front mounting applications on engines such as cooling compressors and fan drives. Steel parts are black painted.

Today nearly all busses for passenger transport are equipped with an air-conditioning system. The diesel engine of the bus serves thereby as energy source of the cooling compressor. The piston- or rotation compressors are driven via V- or Poly-V belts from the spur wheel of the main engine. This belt transmission requires a slippage-free power train to ensure the full capacity of the cooling compressors.

ROSTA designed for this specific application a heat resistant tensioner - powerful, compact with a long compensation travel.

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90-29102018-040641

Type SE-G

The tensioning element type SE-G (marked with yellow dot) has zinc-plated steel parts and therefore is specially designed for "outdoor" applications; e.g. for building machines.

In addition, the type SE-G is equipped with oil resistant synthetic inserts for applications in oily areas, like in gear-boxes and crank-cases.

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90-29102018-040733

Type SE-I

The ROSTA tensioning elements type SEI are all made out of stainless steel. They are available off-the-shelve in four different sizes: SEI 15, 18, 27, housing in SS casted version, SEI 40 (similiar to SE 38), housing in SS welded version.

The stainless steel quality complies with the DIN 1.4301 and AISI 304 specifications. These tensioning elements have been pirmarily designed for applications in the food industry and the chemical process technology.

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90-29102018-040818

Type SE-R

Tensioning element with strengthened tensioning arm. Arm and inner core especially welded for use on combustion engines and compressors. Steel parts with blue lacquering. Marked with white ring. Housing and inner core made out of steel, inserts Rubmix 10.

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90-29102018-041839

Type SE-W

The tensioning element type SE-W (marked with red dot) is equipped with heat resistant elastomeric inserts. It is developed for applications in temperatures from +80° to +120°C (+180° to 250°F), such as belt tensioners for diesel engines, chain tensioner in driers, belt scraper in hot surroundings, etc.

Due to the characteristics of the elastomeric compound, the resulting tension pressure of the type SE-W reduces by 40%, compared to the standard type SE and the type SE-G.

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Many companies worldwide value our products and recommend them to others. But read for yourself what our customers have to say about their experiences with us.
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core technology
The ROSTA Element, an elastomer powered torsional spring, is central to our range of specialised machine components designed to provide a combination of useful functions. ROSTA components offer dependable performance across a broad spectrum of industrial applications
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Durable outer housing.

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Precision crafted inner section
featuring multiple connection options.

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Specialized, high-performance elastomer compound cords.

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refurbish
Select ROSTA elements are capable of being refurbished by replacing either the rubber cords, the inner mounting or the outer housing. Not only is this efficient, but its great for the environment as well.

Contact Sales to learn more about our refurbishment options.
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ACCESSORIES
90-03082018-038646

Type BK

ROSTA modules should be connected on machine parts/structures by means of the standardized clamps and brackets. Relevant welded connections would affect (overheat) the rubber inserts and damage the entire suspension device!

The clamps are supplied separately without bolts. They are standardized to fit exactly for the fixation and positioning of the ROSTA rubber suspension units type DK-S and DK-A by frictional force created by the bolted double clamp. For longer units two or more clamps are recommended. All clamps are paint-finished.

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90-07092018-039294

Type BR

ROSTA modules should be connected on machine parts/structures by means of the standardized clamps and brackets. Relevant welded connections would affect (overheat) the rubber inserts and damage the entire suspension device!

The clamps are supplied separately without bolts. They are standardized to fit exactly for the fixation and positioning of the ROSTA rubber suspension units type DR-S, DR-A and DR-C without any welding. For longer units two or more clamps are recommended. The clamps are paint-finished.

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90-29102018-042877

Type Chain Rider Type P

The high-quality rider is made of friction resistant industrial plastic and allows the use on both rider sides. The max. permissible chain speed should not exceed 1.5 m / sec.

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90-29102018-039553

Type Roller Type R

The roller is made of high-quality industrial plastic material with two self-lubricating ball bearings 2Z.C3.

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90-29102018-039708

Type Roller Type RL

The tensioning roller is made of industrial plastic material with two self-lubricating ball bearings 2Z.C3 and is designed for light-duty drives.

Plastic material: PA 6, black

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90-29102018-042682

Type Wheel N

The sprocket wheel runs on a self-lubricating ball bearing 2Z.C3.

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90-29102018-041952

Type Wheel set - type N

The ROSTA sprocket wheel set completes the tensioning element for applications in chain drives. The sprocket wheel runs on a self-lubricating ball bearing 2Z.C3.

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90-07092018-047466

Type WS

ROSTA modules should be connected on machine parts/structures by means of the standardized clamps and brackets. Relevant welded connections would affect (overheat) the rubber inserts and damage the entire suspension device!

This multi-purpose brackets make an easy screw connection possible on the inner squares of the ROSTA rubber suspension units type DR-A, DK-A and DO-A (as well as a housing fixation of the tensioner devices type SE). The base of the angle section can be positioned in both directions and offers together with the different clamps many combination possibilities of the element assembling. The brackets are paint-finished.

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other products
Elastic suspension for all types of screening machines and shaking conveyors. ROSTA offers the widest range of oscillating mountings. From standard mounts to heavy duty. Also available in stainless steel.
contact us
Get in touch with us. Find your ROSTA company or the ROSTA distribution partner in your country or nearest to you and let us know how we can support you to make you successful in your market.
+41 (0)62 889 04 00
info.ch@rosta.com
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