German KBK coupling KBK model KBK price

KBK 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 as a single unit using 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 the tire coupling has high elasticity, a large ability to compensate for relative displacement between two shafts, good damping, a simple structure, requires no lubrication, and is convenient to assemble, disassemble, and maintain. Its disadvantages are low load capacity and large overall dimensions. As the relative torsion angle between the two shafts increases, the tire shape becomes distorted, 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.

KBK coupling features

Diaphragm couplings can compensate for axial, radial, and angular offsets between the driving and driven machines caused by manufacturing errors, installation errors, load deformation, and temperature changes. Diaphragm couplings belong to metal elastic element flexible couplings. They rely on metal coupling diaphragms to connect the driving and driven machines to transmit torque. They offer the advantages of elastic vibration damping, noise-free operation, and no need for lubrication, making them an ideal product to replace gear couplings and general couplings today. Main characteristics of diaphragm couplings: 1) Strong ability to compensate for misalignment between two shaft axes; compared with gear couplings, angular displacement can be twice as large, reaction force is small during radial displacement, flexibility is high, and certain axial, radial, and angular displacements are allowed. 2) Has a significant vibration damping effect, no noise, and no wear. 3) Adapts to high temperatures (-80+300) and harsh environments, and can operate safely under impact and vibration conditions. 4) High transmission efficiency, up to 99.86%. Particularly suitable for medium and high-speed high-power transmission. 5) Simple structure, light weight, small size, and convenient assembly and disassembly. Can be assembled and disassembled without moving the machine (referring to the type with an intermediate shaft), and requires no lubrication. 6) Can accurately transmit rotational speed with no slip during operation, suitable for transmission in precision machinery.

KBK coupling selection

Correct selection of diaphragm couplings: 1) A diaphragm coupling consists of at least one diaphragm and two hubs. The diaphragm is fastened to the hubs with pins, generally preventing loosening or backlash between the diaphragm and the hubs. Some manufacturers offer two diaphragms, while others offer three diaphragms, with one or two rigid elements in the middle, connected to the hubs on both sides. 2) This characteristic of diaphragm couplings is somewhat similar to bellows couplings; in fact, the torque transmission method of couplings is largely similar. The diaphragm itself is very thin, so it bends easily when relative displacement loads occur, allowing it to withstand deviations of up to 1.5 degrees while generating lower bearing loads in servo systems. 3) Diaphragm couplings are commonly used in servo systems. The diaphragm has good torque rigidity, but slightly inferior to bellows couplings. 4) On the other hand, diaphragm couplings are very delicate and can be easily damaged if misused or incorrectly installed. Therefore, it is essential to ensure that deviations are within the allowable range for normal coupling operation. 5) Adjust the model according to the shaft diameter: The preliminarily selected bearing coupling connection dimensions, namely shaft hole diameter d and shaft hole length L, must meet the requirements of the driving and driven end shaft diameters; otherwise, the coupling specifications must be adjusted according to the shaft diameter d. It is common for the driving and driven end shaft diameters to differ. When torque and speed are the same but shaft diameters differ, select the coupling model based on the larger shaft diameter. In newly designed transmission systems, select from the seven shaft hole types specified in GBT3852, recommending the J1 type shaft hole to improve universality and interchangeability. Shaft hole length shall comply with the i bearing coupling product standard.

KBK coupling usage precautions

1) Products with diaphragms have sharp edges and may cause injury; it is recommended to wear thick gloves during installation. 2) Please install protective covers or other devices around the coupling to ensure safety. 3) If shaft misalignment exceeds the allowable value during installation, the coupling may deform, leading to damage or reduced service life. 4) Allowable shaft misalignment for the coupling includes radial, angular, and axial deviations. During installation, please adjust to ensure shaft misalignment is within the allowable values specified in the corresponding product catalog. 5) When multiple types of misalignment occur simultaneously, the corresponding allowable values must be halved. 6) To extend the service life of the coupling, it is recommended to set shaft misalignment to within 1/3 of the allowable value. 7) Tighten the screws after inserting the installation shaft; otherwise, the coupling may deform. When tightening screws, use a torque wrench and do not use screws other than those provided as accessories. 8) If abnormal noises occur during operation, stop immediately and check installation accuracy, loose screws, etc. It is recommended to apply adhesive to the outer surface of the screws after installation and debugging to enhance protection.

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