Mubea Riemenspannsysteme

The stress is optimized so the friction is reduced to a minimum

Belt Tensioner Systems

Mubea has been developing and producing friction damped belt tensioners for combustion engine auxiliary drive mechanisms for over 30 years.


Mubea belt tensioner systems can be used in mild and full hybrid applications as well as in conventional belt drive systems.


With our new, innovative concepts, we work with our customers to shape future technological trends and thus develop market oriented solutions.

Dual Arm Tensioner Systems : The solution for innovative hybrid applications

The durability of belts has risen substantially in recent years – whilst at the same time the performance of auxiliaries has also increased.

The Mubea Dual Arm Tensioner meets the latest requirements for the belt drive system and offers these essential advantages:

  • Reduced belt forces in engines with start–stop belt systems
  • Lower CO2 emissions (–0.5% CO2)
  • Reduced installation space requirements, particularly when 48-volt alternators are used

Conventional Belt Tensioner Systems : THE BASIS FOR MODERN BELT DRIVE SYSTEMS

Our automatic belt tensioners ensure constant belt force under different operating conditions.

This improves the durability of the belts and bearings. In addition, to avoid noise as the dynamics in the belt drive system increase, the belt vibrations must be damped and slippage at the rollers minimized.


These are the advantages of our conventional belt tensioners:

  • Compact and simple belt drive system design
  • Improved reliability and system effectiveness
  • Reduced assembly effort
  • Optimized efficiency of the auxiliary drive mechanism and thus lower fuel consumption

The history of the belt tensioner system : FOR EVERYONE WHO WANTS TO FIND OUT MORE

Mubea Riemenspanner

Before the ribbed V-belt was introduced, the units were driven from the crank shaft via a simple V-belt.

As a result, damage to the V-belt was one of the most common causes of failure in automobiles. The required belt force was set manually by swiveling the alternator around a suspension axis.  However, due to inaccurate assembly instructions, thermal expansion of the motor, and elongation of the belt over time, a drop in belt tension could occur. This could cause the V-belt to squeak, for example, during rain or low temperatures. The required belt force could only be restored by retensioning the belt via the alternator.


Over time, more and more units such as the water pump, power steering pump, and air conditioning generator have been integrated in the auxiliary drive mechanisms. Depending on the installation space, these components are arranged around the engine and thus determine the belt length. Simultaneously, the requirements for the belts have risen sharply – and the performance of the auxiliaries is continuing to increase.


The need for this task was eliminated following the development of ribbed V-belts, usually with five to six ribs. In order to safely transmit the necessary mechanical forces to drive the units in such a layout, it was necessary to introduce automatic tensioning systems in which one or more pulleys are arranged in a swiveling mechanism, spring-loaded, and damped. They suppress belt vibrations and prevent slippage and noise. They also ensure a constant belt force, independent of belt and unit manufacturing tolerances as well as aging-, temperature-, and load-dependent belt elongation.

Where our belt tensioner systems are developed and manufactured : Locations