German norelem coupling norelem model norelem price

norelem couplings are divided into two main categories: convex and concave. The convex type is further divided into three types: integral with skeleton, integral without skeleton, and radial slit. The inner side of the tire ring is bonded to the steel skeleton by vulcanization, and nuts are welded at the bolt holes on the skeleton. During assembly, bolts are used to connect the flanges of the two halves of the coupling. Torque is transmitted by the friction generated between the tire and the flange end faces when the bolts are tightened. The tire ring undergoes torsional shear deformation during operation, so tire couplings have high elasticity, a large ability to compensate for relative displacement between two shafts, and good damping. Moreover, they have a simple structure, require no lubrication, and are relatively convenient to assemble, disassemble, and maintain. Their disadvantages include low load-carrying capacity and large external dimensions. As the relative torsion angle between the two shafts increases, the tire shape becomes distorted, and the axial dimension slightly decreases, generating significant additional axial forces on the two shafts, which increases bearing load and reduces service life. When the tire coupling operates at high speed, the outer edge of the tire expands outward due to centrifugal force, further increasing the additional axial force. Therefore, measures should be taken during coupling installation to make the stress direction in the tire opposite to the stress direction generated during operation, thereby offsetting part of the additional axial force and improving the working conditions of the coupling and the two bearings.

norelem coupling introduction

If there is any misalignment in the system, it will lead to premature damage to the shaft, bearings, or coupling, meaning it cannot be used in high-speed environments because it cannot compensate for relative shaft displacement caused by high temperatures generated during high-speed operation. Of course, if relative displacement can be successfully controlled, rigid couplings can also perform excellently in servo system applications. In particular, small-sized rigid couplings have superior performance such as light weight, ultra-low inertia, and high sensitivity. In practical applications, rigid couplings have the advantages of being maintenance-free, highly oil-resistant, and corrosion-resistant. Although people in the past did not favor using rigid couplings in servo drives, due to their high torque capacity, rigidity, and zero-backlash performance, small-sized aluminum alloy rigid couplings are increasingly being used in motion control fields.

norelem coupling classification

Rigid couplings are divided into flange couplings, radial key flange couplings, sleeve couplings, clamp shell couplings, and parallel shaft couplings. Flange coupling: A coupling that uses bolts to connect the flanges of the two halves of the coupling to achieve shaft connection. Radial key flange coupling: A coupling that uses radial keys and ordinary bolts to connect the two halves of the coupling. Sleeve coupling: A coupling that uses a common sleeve to connect two shafts in some manner. Clamp shell coupling: A coupling that uses two axially split clamp shells to clamp in some manner to achieve shaft connection. Parallel shaft coupling: A coupling that uses an intermediate disc and pin shafts to achieve connection between two parallel shafts.

norelem coupling mechanical properties

The heating temperature for rigid couplings is usually 560~600℃, and the hardness requirement is HRC22~34. Since the purpose of quenching and tempering is to obtain comprehensive mechanical properties, the hardness range is relatively wide. However, if the drawing specifies hardness requirements, the tempering temperature must be adjusted according to the drawing requirements to ensure hardness. For example, some shaft parts require high strength, so the hardness requirement is high; while for some gears and shaft parts with keyways, the hardness requirement is lower because milling and slotting processes are performed after quenching and tempering. Regarding the tempering holding time, it depends on the hardness requirement and the size of the workpiece. We believe that the hardness after tempering depends on the tempering temperature and has little relation to the tempering time, but the workpiece must be thoroughly tempered. Generally, the tempering holding time for workpieces is more than one hour. Cr can increase the hardenability of rigid couplings, improve the strength and tempering stability of steel, and possess excellent mechanical properties. For large cross-section or important quenched and tempered workpieces, Cr steel should be used. However, Cr steel has second-type temper brittleness. From the perspective of international development trends, new-generation CNC machine tools are developing towards ultra-high speeds to improve production efficiency, using new functional components (such as electric spindles and linear motors) to achieve ultra-high-speed machining. The electric spindles and linear motors required for rigid couplings are directly connected to the motor and spindle via expansion tightening sleeves, eliminating intermediate components such as gearboxes to achieve ultra-high speeds. A single CNC machine tool requires at least five or six sets of couplings, and up to fifty or sixty sets. This indicates a very large market. The German rigid coupling industry is becoming increasingly popular. Coupled with factors such as corporate management, we will analyze what trends the coupling industry will present in the near future.

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