German Legris coupling Legris model Legris price

Legris couplings are mechanical components used to connect two shafts (driving shaft and driven shaft) in different mechanisms, enabling them to rotate together to transmit torque. In high-speed, heavy-load power transmission systems, some couplings also provide buffering, vibration damping, and improved dynamic performance of the shaft system. A coupling consists of two halves, each connected to the driving shaft and the driven shaft respectively. Generally, prime movers are connected to working machines via couplings.

Legris coupling features

Due to their simple structure, low cost, and ability to transmit large torques, they are commonly used when rotational speed is low, there is no impact load, shaft rigidity is high, and alignment is good. Flange couplings (also known as flanged couplings) use bolts to connect two flange-type half-couplings; each half-coupling is keyed to its respective shaft to achieve shaft connection, transmitting torque and motion. Flange couplings have a simple structure, are easy to manufacture, have lower costs, operate reliably, and are simple to install, disassemble, and maintain. They can transmit large torques and ensure high alignment accuracy between the two shafts. They are generally used in shaft systems with stable loads, high speeds, or high transmission precision requirements. Flange couplings do not provide radial, axial, or angular compensation. If proper alignment of the connected shafts cannot be ensured during use, the service life, transmission accuracy, and efficiency of the coupling will be reduced, causing vibration and noise. For rigid couplings, depending on the magnitude of the transmitted torque, all bolts on the flanges may be fitted bolts, or half may be fitted bolts and the other half ordinary bolts. Rigid couplings are lightweight, have low inertia, and extremely high sensitivity. In practical applications, rigid couplings are easy to maintain and resistant to oil and corrosion. In high-speed environments, they can compensate for relative displacement caused by high-speed operation. Of course, if relative displacement can be successfully controlled, they can also perform excellently in servo systems. [1 Structure of rigid couplings: A rigid coupling consists of two half-couplings with grooves on their end faces and an intermediate disc with teeth on both sides. Since the teeth can slide within the grooves, it can compensate for relative displacement between the two shafts during installation and operation. The rigid coupling also includes two shaft sleeves and a central steel housing, where the central steel housing is the torque-transmitting element. Above is some basic knowledge about rigid couplings shared with you, hoping to help users who have confusion in this area. If you have any questions, please contact our factory, and we will try to help you resolve them.

Legris coupling relative motion

Rigid couplings are composed of rigid force-transmitting elements, with no relative motion allowed between connecting parts. Therefore, they do not have the ability to compensate for relative misalignment between two shaft axes. They are only suitable for applications where the two connected shafts can be strictly aligned during installation and no relative offset occurs during operation. Flange couplings contain no elastic elements, lack vibration damping and buffering capabilities, and are generally only suitable for operating conditions with stable loads and no impact or vibration. Rigid couplings were formerly known as fixed rigid couplings, including flange couplings, radial key flange couplings, floating shaft couplings, clamp-shell couplings, sleeve couplings, etc. Rigid couplings generally have simple structures and lower manufacturing costs. When selecting a rigid coupling, alignment errors between the axes of the two connected shafts should be minimized as much as possible. To reduce the impact of additional loads on the coupling, the distance between the coupling and the bearings should be minimized. Flange couplings (also known as flanged couplings) use bolts to connect two flange-type half-couplings. There are two main structural forms of rigid couplings: (1) alignment of the two shafts is achieved using fitted bolts, and torque is transmitted through compression and shear forces on the bolt shanks; (2) alignment is achieved by matching a protruding shoulder on one half-coupling with a groove on the other. Bolts connecting the two half-couplings can be A grade and B grade ordinary bolts, with torque transmitted via the frictional moment at the mating surfaces of the two half-couplings. Materials for rigid couplings can be gray cast iron or carbon steel. For heavy loads or when circumferential speed exceeds 30 m/s, cast steel or forged steel should be used.

Legris coupling disassembly method

A professional manufacturer of rigid couplings teaches you the correct method for disassembling rigid couplings. Before disassembly, mark the mating positions of the various components of the coupling to serve as a reference for reassembly. For Lingsi couplings used in high-speed machinery, the connecting bolts are weighed, and the markings must be clear and not mistaken. When disassembling the coupling, generally remove the connecting bolts first. Due to the deposition of oil sludge, corrosion products, and other deposits on the thread surface, bolts are difficult to remove, especially for severely rusted bolts, which are very challenging to disassemble. [The removal of connecting bolts requires the selection of appropriate tools, because the load-bearing surfaces of the external or internal hexagon of the bolt have slipped and been damaged, making disassembly even more difficult. For bolts that are already rusted or have significant oil sludge, it is common to spray a solvent (such as a rust remover) on the connection between the bolt and nut, allowing the solvent to penetrate into the threads, thus making it easier to disassemble the rigid coupling.

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