New design of shaft coupling

Split hubs for easy assembly

Looking for some kind of technology providing an easier assembly even with couplings from grey cast iron KTR faced a process that has already proven successfully in automotive engineering. The result is an innovative variation belonging to the family of Rotex couplings: the Rotex S-H with split hubs.

As for the Rotex S-H with split hubs the hub can be radially assembled and disassembled without disassembling the power packs – easier servicing. (Photo: KTR)

With the new design the hubs are mechanically separated by „cracking“ on purpose. An uneven surface with a positive fit is the result making sure for exact positioning of the two halves during assembly. The contoured, uneven cracked surfaces ensure an ideal centring of the hub halves. This guarantees that the hub or the connection of the two hub halves, respectively, is not weakened by the separation by cracking. The „cracked“ hub is screwed in place in block assembly and makes sure that during operation there is no negative impact on the strength of the coupling. At the same time the hub can be radially assembled and disassembled without the need to remove the adjacent power packs.

The coupling is easy to access and the adjacent components are easy to be replaced: This ensures the permanent availability of the machine. The Rotex S-H with split hubs is a low-cost shaft coupling from grey cast iron is easy to service and well suitable for mounting in narrow spaces. The coupling is approved and certified according to EC Standard 94/9/EG (Atex 95), category 2G/2D, and thus suitable for applications in hazardous areas of the zones 1, 2, 21 and 22. A wide basic range is available in sizes 38 to 90.

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Easy retrofitting – requested by the user
One further advantage of the Rotex S-H with split hubs is the easy adjustment to each individual application because the pilot bored and „cracked“ coupling hub can be machined without any extra costs. This feature guarantees easy servicing of drive components and systems requested by the Design Engineers and Maintenance Engineers without impacting any technical parameters. In practice the present drive systems are often retrofitted with the new coupling design. One current example is the company Hugo Vogelsang Maschinenbau. The pump manufacturer has recently retrofitted its proven rotary piston pumps of the lines VX and IQ with the new Rotex S-H with split hubs.    pb

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