PB Drums & PB-C Drum Couplings | Stromag

The PB-C drum couplings are composed of two cast iron hubs onto which pins fitted with rubber bushes are mounted:

• a female hub
• a male hub fitted with a brake drum (PB).

The pins, made up of ground steel, have a cylindrical shape up to size 460. Pins of sizes 155 to 200 are axially fastened by a circlips and a nut, pins of sizes 245 to 460 by two circlips. A circlips restricts the socket translational motion.

The rubber bushes are vulcanized onto wear-resisting brass liners which are mounted on the pins with a clearance. This allows them to rotate freely and move slightly lengthwise. The stress exerted onto the bearings is thus significantly reduced. A unique scalloped barrel shape of the bushes guarantees a uniform distribution of loads, even in case of misalignment, thus limiting the bending moment resulting from the radial force on the pins. This ensures increased durability of both bushes and pins.

Dynamic behavior:
The combined elasticity and damping capacity of the rubber bushes reduces both shock loads and critical velocity. Compressed by an increasing torque, the bushes become stiffer due to the scalloping, thereby reducing the resonance effect at critical velocities.

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Stromag France - Industrial Caliper & Drum Brakes (SIME Brakes)
20, allée des Erables
Villepinte
95934 ROISSY C.D.G Cedex
France
Phone: +33 (0)1 49 90 32 20
Fax: +33 (0)1 48 63 23 33
www.stromag.com