German Hafner coupling, Hafner model, Hafner price

The Hafner coupling connects several sets of diaphragms (thin stainless steel plates) to the two coupling halves with bolts in an alternating arrangement. Each set of diaphragms consists of multiple stacked layers. The diaphragms are available in link-type and various shapes of single-piece type. The diaphragm coupling compensates for the relative displacement of the two connected shafts through the elastic deformation of the diaphragms. It is a high-performance flexible metallic element coupling that requires no lubrication, has a compact structure, high strength, long service life, no rotational backlash, and is unaffected by temperature or oil contamination. It features acid, alkali, and corrosion resistance, making it suitable for shaft drive systems operating in high-temperature, high-speed, and corrosive media environments.

Hafner Coupling Introduction

Using just one mechanical torque limiter can quickly disconnect the motor from the main spindle, thereby eliminating the destructive effects of inertial forces. For ordinary machinery, including conveyor drives, office equipment, and various instruments, mechanical torque limiters such as shear-pin safety couplings and friction clutches provide good safety protection. However, they still cannot meet the requirements of high-performance equipment such as machine tools. One problem faced is that ordinary clutches and couplings transmit both torque and misalignment to the protected shaft. In special applications, there are other issues as well. However, the safety coupling is a new type of mechanical torque limiter that overcomes these traditional problems. Safety couplings are best suited to ensure that high-speed, high-precision drive units are protected from overload damage. This coupling is not merely a refined version of ordinary torque limiters but a product specifically designed in collaboration with machine tool manufacturers to meet certain specific requirements. The cost of protective devices with safety couplings is also relatively low. When equipping machining centers with this protective device, each axis typically costs 750 USD.

Hafner Coupling Features

All safety couplings have the following characteristics: 1) No backlash in keyless shaft-hub connections; 2) High torsional stiffness, very low moment of inertia, small size, and adjustable disengagement torque; 3) Maintains original position after re-engagement; 4) Provides alarm during overload; 5) Available in automatic and non-automatic re-engagement versions, with heat resistance (above 260℃). Additionally, some types of safety couplings can compensate for axial, lateral, and angular shaft misalignments. Some models also feature integrated ball bearings on pulleys and sprockets. These characteristics make safety couplings not only suitable for machine tool drives but also for high-performance assembly lines, printing machinery, packaging machinery, etc. The internal-expansion friction safety coupling is a structural type of friction safety coupling. It uses two cylindrical helical springs to press arc-shaped friction plates against an intermediate ring, generating friction between the plates. The magnitude of this friction determines the slipping torque of the coupling. The slipping torque is adjusted by replacing the springs. When the transmitted torque exceeds the slipping torque of the Lingesi coupling, slippage occurs between the driving and driven sides; when the transmitted torque is below the slipping torque, there is no relative slippage between the two sides, and normal operation is automatically restored. Under normal operating conditions within the specified range, component replacement is generally not required. With proper use of the AMN type internal-expansion friction safety coupling, impact loads during startup of the shaft drive system can be effectively partially reduced, allowing for uniform acceleration of the machine while preventing motor burnout due to overload. It can be used in conditions requiring overload safety protection to avoid damage to critical components. The internal-expansion friction safety coupling is a type of flexible safety coupling with elastic elements. It connects two halves of the Lingesi coupling with a double-row roller chain. Relative slippage can occur between the sprocket and the friction plates, providing safety protection. The torque is determined by the compression of the disc springs. It is suitable for connecting drive shaft systems with coaxial and parallel axes and has certain capability to compensate for relative misalignment between the two shafts, limiting torque and providing overload protection.

Hafner Coupling Applications

The features and applications of safety couplings are analyzed as follows: 1) Wide torque control range and high control precision. Torque is proportional to the excitation current over a wide range, enabling complete and simplified control of transmitted torque, and it can be used as a linear regulation element. 2) Has constant torque characteristics; torque depends solely on the magnitude of the excitation current and is independent of the relative speed between the driving and driven sides. It has definite torque characteristics, with static torque equal to dynamic torque. 3) Can transmit a certain torque regardless of slip difference, without shock, vibration, or noise, ensuring smooth operation, suitable for occasions with high operating frequencies. 4) Low power consumption and low control power. The residual torque when excitation current is disconnected is very small, offering good disengagement performance. There is no heating phenomenon during idling, and torque stability is good, suitable for precise control. 5) Simple structure, small volume, and light weight. The magnetic powder is dry and does not require oil, making it easy to maintain. The magnetic powder has good oxidation resistance, heat resistance, long service life, and high reliability. By fixing the driven part, the torque becomes a braking torque on the rotating part, turning it into a magnetic powder coupling or a magnetic powder load brake.

Weidou Intelligent Technology specializes in selling German Hafner rigid couplings, Hafner flexible couplings, Hafner safety couplings, Hafner universal joints, Hafner diaphragm couplings, Hafner jaw couplings, Hafner flange couplings, Hafner cross-slide couplings, Hafner slider couplings, Hafner gear couplings, Hafner tire couplings, Hafner elastic couplings, Hafner bellows couplings, Hafner roller chain couplings, Hafner spring couplings, all original imports from Germany. We welcome inquiries and orders from customers.