German Mahr coupling Mahr model Mahr price

Mahr 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 coupling halves. 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, the structure is simple, requires no lubrication, and is convenient for assembly, disassembly, and maintenance. Its disadvantages are 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.

Mahr coupling manufacturing process

Jaw couplings are machined by turning, milling, and broaching, followed by overall heat treatment to ensure sufficient mechanical strength. There is also a cast jaw hub on the market that allows for mass production and eliminates machining loss, making it much cheaper than machined versions. However, cast components do not perform well and are best avoided in critical applications. Additionally, the jaws of cast hubs are prone to tooth breakage (jaw tooth detachment) under high speed or high load conditions. 1) Compact, backlash-free, available with three different hardness elastomers; 2) Absorbs vibration, compensates for radial and angular misalignment; 3) Simple structure, easy to maintain and inspect; 4) Maintenance-free, oil-resistant, electrically insulating, operating temperature 20℃ to 60℃; 5) Jaw elastomers are available in four-lobe, six-lobe, eight-lobe, and ten-lobe configurations; 6) Fixing methods include set screw, clamping, and keyway fixation.

Mahr coupling application range

Jaw couplings are widely used in CNC machine tools, CNC lathes, machining centers, engraving machines, CNC milling machines, computerized milling machines, metallurgical machinery, mining machinery, petroleum machinery, chemical machinery, lifting machinery, transport machinery, light industry machinery, textile machinery, water pumps, fans, etc.

Mahr coupling installation and use

1) Wipe dust and dirt from the installation shaft surface clean, and apply a thin layer of machine oil or lubricant. 2) Clean the inner bore of the coupling and apply machine oil or lubricant. 3) Insert the coupling onto the installation shaft; if the bore fit is tight, avoid striking with an iron hammer or hard metal during installation. 4) After positioning, first tighten the screws gently in a diagonal pattern using a torque wrench (specified tightening torque 1/4). 5) Increase the force (to 1/2 of the specified tightening torque) and repeat step 4. 6) Tighten and fix according to the specified tightening torque. 7) Finally, tighten the fixing screws sequentially in a circumferential direction. 8) For disassembly, please proceed only when the device has completely stopped; loosen the locking screws sequentially.

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