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New couplings for mobile, stationary applications.

Guardian Industries, the Michigan City, Ind., manufacturer of flexible flywheel, shaft and pipe couplings, recently made a major addition to its product range with the introduction of a line of elastic shaft-to-shaft couplings. The new Superflex elastic couplings are targeted at a range of stationary applications, such as light towers, generator sets, compressors and welders.

The Superflex coupling incorporates two cast iron hubs, which bolt around an elastic center member. The rubber element of the center section is prestressed and held in place by an outer metallic band. When the band is removed upon installation, the rubber expands from its prestressed condition, which allows it to accommodate higher vibratory torque loads. The couplings can be applied in engine applications from about 10 hp up to approximately 600 hp, the company said.

The new design was initially engineered at the request of a light tower manufacturer, which had been having trouble with vibration, according to Ted Pulaski, general manager at Guardian. "All the couplings they were trying were just tearing up," he said. "They needed a different solution and this was the new mousetrap we designed.

"The real key is the prestressed center section, which is especially effective in applications with higher inertial loads. It can accept load in shear and compression."

The Superflex couplings are available in eight models, with nominal torque capacities ranging from 354 to 21,240 Bore diameters span from 1.102 in. to 5.118 in, with installed lengths of 3.976 to 14.961 in. Weight, including fastners, ranges from 4.41 to 187.43 lb.

The coupling can also accommodate a high degree of misalignment. When properly installed, it can accept a nominal torsional angle of up to 8 [degrees]; nominal axial misalignment of 0.125 to 0.375 in.; radial displacement of 0.040 to 0.080; and angular misalignments as high as 3 [degrees].

"This coupling has really filled in a gap in our product line between our Gear Grip and Jaw-style couplings," said Pulaski. "It allows us to compete very effectively in a very wide range of applications."

Along with the Superflex units, Guardian has also developed a new tapered grid coupling targeted primarily at electric motor or gearbox driven applications, such as pumps and conveyors. The Guardex TG couplings are similar in design to the company's steel gear couplings, except the connecting sleeve is replaced by a flexible chromevanadium alloy leaf spring grid. The steel hubs are cut with profiled slots, allowing the grid to engage circumferentially. The grid "springs" deflect under torque, distributing the peak torque load over a large angle of rotation. The inherent torsional softness allows the coupling to absorb shock loads, according to the company.

The Guardex TG couplings are available in 16 models, with bore diameters from 1.18 in. to 10.98 in. and nominal torque capacities from 422 to 600,112 in. lb.

Both of the new couplings are manufactured at Guardian's 40,000 sq.ft. headquarters facility in Michigan City.

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Publication:Diesel Progress North American Edition
Date:Jun 1, 1999
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