German GATES coupling GATES model GATES price

GATES couplings consist of components such as an internal gear ring and flanged half-couplings with external teeth, all having the same number of teeth. External teeth are available in two profiles: straight teeth and crowned teeth. Crowned teeth refer to external teeth machined into a spherical surface, with the sphere's center on the gear axis. The tooth side clearance is larger than that of standard gears. Crowned tooth couplings allow greater angular misalignment (compared to straight-tooth couplings), improve tooth contact conditions, enhance torque transmission capacity, and extend service life. During operation of gear couplings, relative displacement occurs between the two shafts, causing periodic axial relative sliding between the internal and external tooth surfaces, inevitably leading to tooth surface wear and power loss. Therefore, gear couplings must operate under good lubrication and sealing conditions.

GATES 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 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 standard clutches and couplings transmit both torque and misalignment to the protected shaft. In special applications, there are other issues as well. However, safety couplings are a new type of mechanical torque limiter that overcome these traditional problems. Safety couplings are best suited for protecting high-speed, high-precision drive systems from overload damage. This coupling is not merely a refined version of standard torque limiters, but a product specifically designed in collaboration with machine tool manufacturers to meet specific requirements. Protection devices equipped with safety couplings are also lower in cost. When equipping machining centers with this protection device, each axis generally costs 750 USD.

GATES 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, 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 versions, with heat resistance (above 260°C). In addition, certain types of safety couplings can compensate for axial, lateral, and angular shaft misalignments. Some models feature integrated ball bearings for 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 internally expanding 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 internally expanding friction safety coupling, impact loads during start-up of the shaft transmission system can be effectively partially reduced, enabling uniform acceleration start-up, while preventing motor burnout due to overload. It is suitable for applications requiring overload safety protection to avoid damage to critical components. The internally expanding friction safety coupling is a type of flexible safety coupling with elastic elements. It connects two halves of Stieber couplings via a double-row roller chain. Relative sliding can occur between the sprocket and friction plates, providing safety protection. Torque is determined by the compression of disc springs. It is suitable for connecting transmission shaft systems with coaxial or parallel axes, offers certain compensation for relative shaft misalignment, limits torque, and provides overload protection.

GATES 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 excitation current over a 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 fixed torque characteristic, with static torque equal to dynamic torque. 3) Can transmit a certain torque regardless of slip, without shock, vibration, or noise. Operation is smooth, making it suitable for high-frequency operation. 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 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, converting it into a magnetic powder coupling or a magnetic powder brake.

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