Compensating coupling

Achieving optimal relationship between torsional stiffness and damping is no easy task. That's why the ROBA(R)-ES elastomeric servo coupling is especially suited for highly dynamic critical drives.

Two hubs and a flexible ring make up the coupling. During assembly, the star-shaped ring presses into specially designed claws under slight pretension. Result: backlash-free torque transmission at relatively high speeds, despite radial, axial, or angular shaft misalignment.

Elastomeric rings of different shore hardness vary torque, rigidity, and damping behavior.

Robert Whipple, Mayr Corp., 4 North St., Waldwick, NJ 07463, 201-445-7210.

Steel shapes

While aluminum extrusions are quite common, design engineers might be surprised to learn that extrusions can also be produced in carbon and stainless steel. Such parts offer advantages regarding strength, durability, corrosion, and heat resistance.

By heating and lubricating with glass powder, a round steel billet can be forced through a forming die to produce a shaped bar. Full-length bars are useful for applications such as custom rails; slices can be used to produce automotive hinges, valve bodies, or forklift attachments.

Shapes to 10 inches in diameter are possible, while part weights range from 1 to 60 lbs/ft. Almost any grade of stainless or carbon steel can be extruded.

U.S. Profiles, Inc., Box 720252, Atlanta, GA 30358, 770-992-0398.

Treaded belt

Tire tread patterns on automotive belts won't make driving in the rain any easier. But as Goodyear has discovered, the designs help belts run longer and quieter.

Automotive belts generate heat as they drive the fan, power steering, and alternator. Also, the pulleys which guide the belts into forward and backward bends, compress and stretch the rubber polymers.

Helical-cogged ribs relieve these stresses, so the belt runs several degrees cooler. In addition, the design's angled grooves and a noise-abating rubber compound can reduce sound by 15 decibels when compared with conventional serpentine belts.

W.K. Scherer, The Goodyear Tire & Rubber Co., Akron, OH 44316-0001, 330-706-1054.