Couplings offer better performance, less maintenance

Timken’s Quick-Flex (QF) couplings have been designed for high and low torques, as well as high and low speeds. They have the strength to handle tough challenges with little or no maintenance; they’re also easy to install and require no lubrication.

“The QF coupling can replace most other couplings on the market,” Michael Greelish, a spokesman for Timken’s Australian distributor BSC, said.

In quarrying operations, the QF coupling’s primary use is for pump applications and, while it is suited to both fixed and mobile plant, it is more relevant to fixed plant.

{{quote-A:R-W:220-Q:“The QF coupling can replace most other couplings on the market.”}}The couplings’ life spans match those of rotating equipment to help keep the overall cost of ownership low.

“The QF is a sheer coupling, so in the event of an overload or jam-up the element will sheer, allowing the driven coupling hub to remain stationary. As the coupling hubs are not engaged, no damage occurs between the hubs. The coupling element is the torque limiter protecting the asset,” Greelish explained.

The QF couplings operate without any metal-to-metal contact, which ensures the metal hubs don’t wear. Therefore, the elastomeric insert is the only spare part required and the need for grease lubrication and quarterly preventative maintenance attention is eliminated.

According to BSC, customers have been most impressed with the ease of installing the QF coupling.

{{quote-A:R-W:220-Q:“Replacing elements is quick and easy.”}}“Replacing elements is quick and easy,” said Greelish. “There’s no need to move mating equipment, hubs will not wear when element sheers and alignment isn’t necessary on replacement elements.

“There’s a broad range of sizes available and customers have a range of elements to choose from to best suit their environment. They’re also available in straight bore or taperlock versions.”

For especially harsh environments, Timken also offers a stainless steel version of each coupling.

The versatile design means that the QF couplings directly replace most coupling configurations. In addition, operators don’t need large inventories of spare parts for couplings; instead, a urethane insert, which can be replaced in just a few minutes without removing the hubs, is all that is required.

The couplings withstand up to two degrees of misalignment, as well as dampening vibration and shock loads in equipment.


The QF couplings save operators time and money, eg:
• Solid and split covers are designed to accommodate higher speeds and increased torque.
• They are inherently balanced from precision machining for high speed applications.
• Their design dampens torsional vibration and shock to help extend the life of the coupling and surrounding components.
• Inserts can be replaced without moving or disassembling the driving or driven equipment.


Operators can choose from multiple insert and cover configurations that withstand some of the most extreme environments, eg:
• Twelve families ranging from bore sizes of 9.4mm to 285mm.
• Designed for continuous torque levels from 0.043kNm to 188.8kNm.
• Designed for peak torque levels from 0.085kNm to 377.5kNm.
• Couplings accept shaft misalignment up to two degrees.
• Split cover options help resist the axial separating force under high torque.
• Standard and double-ended spacer couplings available for shaft separations of 25.4mm to 3048mm for increased application acceptance.
• Four bore options available to meet customers’ needs, eg:
   1. Bored, keyed and set screws style – clearance and interference fit.
   2. Bushing style.
   3. Splined style.
   4. Mill motor style.
• Four insert choices for varying torque needs and temperature ranges up to 177 degrees Celsius.


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