HYGIENIC DESIGN. TORQUE LIMITERS AND SHAFT COUPLINGS MADE OF STAINLESS STEEL

Completely made of stainless steel, and therefore ideally suited for clean rooms, are the type ECR safety coupling, the EWC and EWR shaft couplings, and the EWLC distance coupling.

The type ECR torque limiter, designed for indirect drives and steplessly adjustable disengaging torques between 15 and 350 Nm, is made of stainless steel on the outside and inside (disc spring). The locking balls are lubricated for life according to the NSF registration. This torque limiter is particularly characterized by its compact design, which ensures space-saving installation.

The metal bellows coupling type EWC, available for nominal torques between 5 and 1,000 Nm, consists of stainless steel bellows (1.4571 / A4), stainless steel hubs (1.4301 / A2) and stainless steel screws. In order to meet the high hygiene regulations, ENEMAC dispenses with the conventional adhesive process and connects the parts in a micro-plasma welding process, which guarantees unlimited fatigue strength between 223 K and 623 K. This extremely short coupling with the 4-shaft bellows is versatile; above all in sterile and even acidic environments.

The type EWR half-shell version made of stainless steel is new to the range. It is also made of A4 or A2 stainless steel and has the same properties and advantages as the type EWC which is already established on the market. It is also particularly suitable for use in systems that are difficult to access, where space is very limited and the drive and output units are rigid or cannot be moved in axial direction. With type EWR, the two lower halves of the hub can be disassembled and the coupling then be placed radially on the shaft ends. Afterwards the loose hub halves can be placed on the opposite side of the shaft and connected using stainless steel clamping screws. Disassembly is also possible with little effort and requires no further aids such as pullers or other tools. The hygienic designed metal bellows coupling is available for nominal torques from 10 Nm to 1,200 Nm.

If, however, widely spaced shafts have to be hygienically connected to each other in demanding environments, the rust-free distance coupling EWLC can be used. This type of coupling, with a length of up to 3 m, has a variable-length intermediate pipe made of A2 or A4 stainless steel, which is adapted to the customer's requirements. This pipe is connected with two metal bellows couplings made of A4 stainless steel. In many cases, the EWLC spacer coupling can be used as a backlash-free connecting, power train or synchronous shaft. Alignment errors, especially parallel misalignments, can be compensated with this type on a considerable scale.

The half-shell hubs simplify assembly and ensure a secure, non-positive connection. The type is particularly torsionally rigid and is suitable for high operating speeds of up to 6,000 min-1 with a low moment of inertia. The EWLC is available in 7 sizes with a nominal torque of up to 1,200 Nm. Shaft diameters between 7 mm and 85 mm can be accommodated.

Furthermore, ENEMAC offers safety couplings of the types ECI, ECE and ECG, also with a stainless steel housing and a coated, rustproof disc spring. Even encapsulated special versions can be manufactured on request.

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