What performance does the diaphragm coupling need to have

Published: 2020-06-15

Compared with the gear coupling, the diaphragm coupling has no relative sliding, no lubrication, sealing, no noise, no maintenance at all, and convenient manufacturing. It can partially replace the gear coupling.The machinery industry specifications have now been formulated, and they have recently been revised into new industry specifications.

The relationship between the torques of the coupling.Couplings transmit torque in the same way.The diaphragm itself is very thin, so it is easy to bend when the relative displacement load is generated, so it can accept up to 1.5 degrees of deflection, and at the same time produce a lower bearing load in the servo system.Diaphragm couplingOften used in servo systems, the diaphragm has good torque rigidity.

The diaphragm coupling is very delicate and can be easily damaged if it is misused in operation or without the correct device.Therefore, it is very necessary to ensure that the deviation is within the acceptable range of the normal operation of the coupling.Choosing the right coupling is a key step to make good use of the coupling. In the design stage, you have to think about what type of coupling to choose.

The coupling needs to have the following properties:

According to different working conditions, the transferability of the coupling refers to the ability to compensate for the relative displacement of the two rotating components.Factors such as manufacturing and installation errors between connected components, temperature changes during operation, and load deformation.

All have put forward requirements for mobility, which can compensate or reduce the extra load and cushion between shafts, bearings, couplings and other parts caused by the relative displacement between rotating parts.For frequent load starting or working load changes, the coupling needs to have cushioning and damping elastic elements to protect the prime mover and working machinery from damage.

Safe, reliable, with sufficient strength and service life, simple structure, easy to assemble, disassemble and maintain.When selecting the coupling type for the coupling type, the following items should be considered, the size and nature of the required transmission torque, the requirements for cushioning and damping functions, and whether resonance will occur.

The degree, size and installation method of the relative displacement of the two shafts caused by manufacturing and assembly errors, shaft load and thermal expansion deformation and relative movement between parts allow easy assembly, adjustment and maintenance of the required operating space.For large couplings, it should be possible to disassemble the shaft without axial movement.

Relatively common in the marketGear couplingThere are common structure gear couplings, drum gear couplings, nylon gear couplings and so on.Among them, there are many types of drum gear couplings and they are widely used.

According to the different axial tooth profile of the outer gear bushing, three ways can be divided, namely, straight gear coupling, drum gear coupling and special drum gear coupling, gear coupling internal and external gears Type coupling.Gear couplings have small radial dimensions and large load-bearing capacity. They are long used for shaft transmission under low-speed and heavy-duty conditions. High-precision and balanced gear couplings can be used for high-speed transmission, such as the shaft of gas turbines. Transmission line.Since the angular compensation of drum gear couplings is greater than that of straight gear couplings, drum gear couplings are commonly used at home and abroad. Straight gear couplings are obsolete products. Optional.

Regardless of which type, the ring gear and the involute spur internal gear are the same except for the difference in the selection of the head clearance coefficient of the gear teeth.The axial gear blank of the external gear bushing of the spur gear coupling can be machined into two kinds of linear and circular arc shapes, and the index circle and the tooth root circle are both straight lines. The meshing method of this coupling is gradually The meshing of the internal and external teeth of the open cylindrical gear is the same.By increasing the side clearance of the inner and outer teeth, the relative displacement between the two shafts is compensated, but the amount of compensation is limited.The tooth tip of the outer gear sleeve of the drum gear coupling is processed into an arc, that is, the tooth blank is processed into a spherical surface. In the section of the tooth center plane and tangent to the pitch cylinder surface, the teeth form a drum shape, the so-called drum method Coupling.Its characteristics are: high bearing capacity, calculated by bending strength, under the same conditions, the torque transmitted by the straight tooth coupling is 15~30% higher; reasonable structure, reliable performance, because the tooth side is drum-shaped, the axis Under certain angle conditions, the contact condition is improved, thereby reducing the contact stress, eliminating the load concentration at the end of the spur coupling, that is, eliminating edge extrusion and improving working performance.