German KTR coupling KTR model KTR price

KTR couplings are components that connect the prime mover to the driven machine. Their main function is overload protection. The torque limiter restricts the torque transmitted by the drive system by slipping when the required torque exceeds the set value due to overload or mechanical failure. It automatically re-engages once the overload condition disappears. This prevents mechanical damage and avoids costly downtime losses.

KTR coupling introduction

Using just one mechanical torque limiter can quickly disconnect the motor from the spindle, thereby eliminating the destructive effects of inertial forces. For ordinary machinery, including conveyor drives, office machines, 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. However, safety couplings are a new type of mechanical torque limiter that overcomes these traditional problems. Safety couplings are best suited for ensuring that high-speed, high-precision drives are protected from overload damage. This coupling is not merely a refined version of ordinary torque limiters, but a product specifically designed in cooperation with machine tool manufacturers to meet certain specific requirements. Protection devices with safety couplings are also lower in price. When equipping machining centers with this protection device, each axis generally costs 750 USD.

KTR coupling features

All safety couplings have the following characteristics: 1) No backlash in keyless shaft-hub connections; 2) High torsional rigidity, very low moment of inertia, compact 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 types, with heat resistance (above 260°C). In addition, some types of safety couplings can compensate for axial, radial, and angular shaft misalignments. Some models feature integrated ball bearings on pulleys and sprockets. These characteristics make safety couplings suitable not only 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 via an intermediate ring, generating friction between the plates. The magnitude of this friction determines the coupling's slip torque. The slip torque is adjusted by replacing the springs. When the transmitted torque exceeds the slip torque of the Stieber coupling, slippage occurs between the driving and driven sides; when the transmitted torque is below the slip torque, there is no relative sliding 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 transmission system can be effectively partially reduced, enabling uniform acceleration startup, while preventing motor burnout due to overload. It is suitable for operating 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 Stieber coupling with a double-row roller chain. Relative sliding 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 transmission shaft systems with coaxial and parallel axes, has certain compensation capability for relative shaft misalignment, limits torque, and provides overload protection.

KTR 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 fairly wide range, allowing perfect and simplified control of transmitted torque, making it suitable as a linear regulation element. 2) Constant torque characteristic: 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 a constant torque nature, with static torque equal to dynamic torque. 3) Can transmit a certain torque regardless of slip difference, without shock, vibration, or noise. Operation is smooth, making it suitable for high-frequency operating conditions. 4) Low power consumption and low control power. Residual torque is minimal when excitation current is disconnected, offering good disengagement performance. No heating occurs during idling. Torque stability is good, suitable for precise control. 5) Simple structure, small volume, and light weight. The magnetic powder is dry and oil-free, making maintenance easy. The magnetic powder has oxidation resistance, good heat resistance, long service life, and high reliability. By fixing the driven part, the torque becomes a braking torque on the rotating part, forming a magnetic powder coupling, which can also serve as a magnetic powder load brake.

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