Belts for Power Transmission

Elastomer and polyurethane timing belts for the highest performance requirements

  • Belts for power transmission overview: red and white timing belts
  • Belts for power transmission overview: red and white timing belts

In response to increasing technological demands concerning performance, reduced noise emission and increased life span expectancies, a wide range of tooth profiles have been introduced to the market over the past 60 years. And new applications constantly require new state-of-the-art special belts in all possible designs. 

The highest level of performance can be achieved by using tension members with low stretch and a high resistance to reverse bending, selecting the right tooth shape for an optimized force and tension distribution, as well as using the right belt-material-compounding for improved attributes related to the tooth shear strengths. This is needed to ensure a reliable power transmission for high torques and high dynamic stress. 

The Angst+Pfister belts are designed for applications in drives with extremely high acceleration forces, as well as for the reliable transmission of high torque at low speeds. We support you in choosing the right profiles and the appropriate belt processing for your power transmission. No matter how complex the task is: APSOdrive® offers you the right solution.
 

Applications

  • Low maintenance applications
  • Low noise applications
  • High shock applications
  • High vibration applications
 

Traction drives

Traction drives, or commonly known as belt and chain drives, are generally used to transmit power or motion. A traction drive can also be used to move or position items, which is commonly known as transport or linear technology. Subject to the task an application has to achieve, there are several possibilities to complete the challenge. Traction drives are divided into two categories: the positive traction drives for timing belts or chains and friction traction drives for V-shaped belts, as well as round and flat belts.
 

Positive traction drives

A positive traction drive guarantees a synchronous transmission between the pulleys – therefore, it is also called synchronous drive. This kind of power transmission is gaining further importance due to its very high-power ratings and striking life cycles.

 

Friction traction drives 

Compared to positive traction drives, friction traction drives have the significant advantage of tolerating a temporary slippage due to excessive overload. It is the nature of this kind of drive that higher pre-tension forces have to be applied to ensure a flawless operation. Therefore, higher bearing loads have to be accepted. Also, the belt is subject to a certain amount of constant slippage, as a result of which a perfect synchronous transmission cannot be achieved.

 

CONTI® SYNCHROCHAIN

The CONTI® SYNCHROCHAIN combines high tear resistance with exceptional tensile strength, making it one of the world’s best performers amongst today’s timing belts. This high-performance timing belt with CTD profile makes extreme applications possible. This belt with its high shock absorption capability is designed for applications in drives with extremely high acceleration forces as well as for the reliable transmission of high torque at low speeds. To deal with the impact loads occurring in the case of abrupt acceleration and deceleration, the CONTI® SYNCHROCHAIN employs a compound highly resistant to elongation and tearing. This compound reliably absorbs even maximum surges and guarantees the maintenance-free functioning of pulsating drives in continuous service.

 

BRECOFLEXmove®

The BRECOFLEXmove® is a timing belt also specifically designed for high-performance and traction drives with a particularly high stiffness requirement. A newly developed steel cord tension member increases belt stiffness and tear-resistance, making transmission of stronger forces possible. The tooth flank geometry has been optimized through the Finite Element Method (FEM). This leads to an optimization of the contact pressure distribution and reduces the work of friction between the timing belts and pulley, thus minimizing wear. In addition, a friction-optimized laminate coating is applied to the tooth side.

Product List

Product Description Type of traction drive Material Available versions Benefits Key applications Order
        Single-sided Double-sided With reinforced belt back With transport coating Nylon facing on tooth-side Nylon facing on back-side Increased power transmission rate Precise positionning For reverse flexing/reverse tensioning idlers Resistant to aging and ozone
 
Resistant to oil and grease High ambiant temparture (over +80°C) Low maintenance application Low noise application High shock application High vibration application  
BRECOflex® Endless timing belts Positive Polyurethane x x x x x x x x x (x) (x)   x x x    
BRECO-V® Welded to endless joined timing belts Positive Polyurethane x x x x x x   x x (x) (x)   x x      
BRECOmove® High performance timing belts Positive Polyurethane x           x x x (x) (x)   x   x    
BRECOclassic® Alternative standard timing belts Positive Polyurethane x     x x x   x x (x) (x)   (x) x      
Continental Synchroflex® Endless timing belts Positive Polyurethane x (x)           x x (x) (x)   x x      
Continental Synchroflex GenIII® High performance timing belts Positive Polyurethane x           x x x (x) (x)   x x x    
Chain Industrial chains Positive Metal             x   x x x x          
Continental SilentSync® Self-tracking high perfomance timing belts Positive Rubber x           x     x (x) x x x x x  
Continental Synchrobelt® Endless timing belts Positive Rubber x               x x (x) x x        
Continental Synchroforce CXP®/CXA® Advanced performance endless timing belts Positive Rubber x           x   x x (x) x x   x    
Continental Synchroforce Carbon High performance endless timing belts Positive Rubber x           x x x x x x x   x    
Continental Synchrotwin® Double-sided timing belts Positive Rubber   x             x x (x) x x        
Continental Synchrochain® High performance endless timing belts Positive Polyurethane x           x x x x (x)   x   x    
Continental Synchrochain Carbon® High performance endless timing belts Positive Polyurethane x           x x x x (x)   x   x    
Wrapped V-Belts V-Belts covered with special rubber fabric Frictional Rubber x x         x   x   (x)     x x x  
Raw Edge V-Belts Cogged rubber V-Belts with raw edges Frictional Rubber x           x   x   (x) (x)   x x x  
Banded V-Belts Multibelt − Multiple V-Belts joined to a single unit Frictional Rubber x           x   x   (x)     x x x  
Poly-V Belts Multirib − Multiple V-ribbed belts Frictional Rubber x           x       (x)     x x x  

Elastomer or polyurethane?

Timing belts are available in different materials, but the most common ones are elastomer and polyurethane. Elastomer is used as a general term for polychloroprene as well as any related elastomer compounds. The same applies to polyurethane, as different compounds from polyether or polyester are available, which are suitable for casting or extruding manufacturing processes. The commonly used abbreviation TPU stands for thermoplastic polyurethane. Before selecting from the two materials, elastomer or polyurethane, parameters like purpose, requirements and the environment should be defined, since all these parameters can also have an impact on the reinforced tension member, which can be made of steel, glass, aramid or carbon. Furthermore, any added layer on the back or tooth side of the belt needs to be considered. A solution with an elastomer belt for a power transmission is usually more economical. On the other hand, a polyurethane belt is the better solution for positioning devices.
 

Polyurethane

Basic properties
• length stability and low stretch due to steel cords
• resistant against deformation and high shear strength
• customized pulley teeth tolerances on request
• self-guiding drive belts available
• high positioning accuracy
• customized solutions available 

Special properties
• various tension members available
     - high flexibility
     - high power
     - available in stainless steel
     - available in aramid
• high pitch accuracy
• customized reworkings feasible
     - coatings
     - profiles (welded or screwed-on)
     - machining
• special polyurethane compounds available
 

Elastomer

Basic properties
• good damping capabilities
• low lateral forces
• low noise emission
• low tendency for tooth skipping 
• antistatic version available
• excellent price-performance ratio

Special properties
• high performance compounds
     - superior level of oil resistance
     - high temperature resistance
• PTFE refinement of the tooth fabric
• coatings

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