The cross section of the plum petals of the plum coupling is usually circular, which can improve the uniformity of the load distribution on the working surface, and can transmit larger torque, but the elasticity is slightly reduced.It can also be made into a rectangle or fan shape.When the coupling is working, the plum petals are squeezed, and only half of the plum petals carry work.Plum-shaped elastic parts generally use polyester polyurethane (hardness code a), or cast nylon (hardness code b), the former has a lower load-bearing capacity than the latter.The semi-coupling and flange connection materials are 45 steel or ZG70-500. In the chemical industry, for anti-corrosion purposes, this phenolic resin is often used to make semi-couplings.
The quincunx-shaped elastic coupling has a simple structure, a small number of parts, a small radial dimension, and no lubrication; the elastic element has a high load bearing capacity under pressure.Except for the double-flange quincunx elastic coupling, the half-coupling must be moved axially when replacing the vulnerable quincunx elastic parts.This kind of coupling has a certain ability to compensate the relative deviation of the two shafts.
The quincunx-shaped coupling is to install an integral quincunx-shaped elastic ring between the convex claws of two half-couplings of the same shape to realize the connection of the two halves of the coupling.The power is transmitted through the squeezing between the claw and the elastic ring, and the relative deviation of the two shafts is compensated by the elastic deformation of the elastic ring to achieve vibration reduction and buffering.This kind of coupling has been standardized, GB/T5272-2002 has five structural forms: LM type (basic type), LMD type (single flange type), LMS type (double flange type), LMZ-I type ( Split brake wheel type) and LNZ-II (full brake wheel type).There are 14 specifications for each type, the applicable shaft hole diameter d=12-160mm, the shaft hole length L=35-135mm, the nominal torque T=25-25000N.m, the allowable speed [n]=1500- 15300r.min.
