Plastics upgrade timing-belt tensioner

Feb. 3, 2005
Metal timing chains are widely used by most carmakers and engine manufacturers. But as demands for lower weights, costs, and noise continue, automotive engineers are turning to plastics for components in the timing systems, such as the chain tensioner.

The Porsche Cayenne SUV, for example, uses a two-part tensioner made of two grades of Stanyl from DSM Engineering Plastics, Evansville, Ind. (www.dsmep.com), to replace what was once an all-aluminum component. Stanyl TW314 is a PA46 with good wear characteristics and oil resistance, and can withstand engine operating temperatures of 140°C. It's used for the top layer that presses on the timing chain. It is nonabrasive, so friction drops and chain life lengthens. Stanyl TW241f10, a 50% glass-filled PA46, is strong enough to be used for the base of the tensioner. It resists oil and fatigue, has a high modulus and stiffness, and low creep at high temperatures.

The stiff tensioner base is molded in its final shape, complete with the proper curvature for handling the chain. All mounting and pivot points, as well as reinforcing ribs, are precisely located for fast, simple assembly. The top layer comes from its mold with a smooth finish, complete with guides for the chain.

 

 

Sponsored Recommendations

Sept. 16, 2025
From robotic arms to high-speed conveyors, accuracy matters. Discover how encoders transform motor control by turning motion into real-time datadelivering tighter speed control...
Sept. 16, 2025
Keep high-torque gearboxes running efficiently with external lubrication and cooling systems delivered fast. Flexible configurations, sensor-ready monitoring, and stocked options...
Sept. 16, 2025
Now assembled in the U.S., compact P2.e planetary gear units combine maximum torque, thermal efficiency, and flexible configurations for heavy-duty applicationsavailable faster...
Sept. 16, 2025
Safety in automation goes beyond fences and emergency stops. Learn how functional safety actively monitors and controls motiondelivering smarter protection, greater flexibility...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!