Double Diaphragm Couplings

Double diaphragm coupling is a high-performance flexible coupling that uses two sets of metal diaphragms as elastic elements, which can effectively transmit torque and compensate for various misalignment situations between shaft systems. With its excellent performance and reliability, it has become a key component in modern industrial power transmission systems.

The double diaphragm coupling mainly consists of the following components:

Two sets of metal film sets: usually made of stainless steel, each set contains several stacked thin metal sheets
Intermediate shaft: a rigid component that connects two sets of membranes
Wheel hub: a component connected to the drive shaft and the driven shaft
Bolt assembly: High strength bolts used to secure various components

The double diaphragm coupling achieves the following functions through the elastic deformation of two sets of metal diaphragms:

Torque transmission: transmitting power through the shearing and bending of metal diaphragms
Compensation for misalignment:
Axial displacement compensation: ± 0.5-5mm
Radial displacement compensation: 0.2-3mm
Angular displacement compensation: 0.5 ° -3 °
Vibration reduction function: The elasticity of the diaphragm can absorb some vibrations

Main Features

High torque transmission capability: The metal diaphragm can withstand high torque without deformation
Zero backlash: ensuring precise positioning and synchronization performance
Maintenance free: No lubrication required, reducing downtime
Long lifespan: The fatigue life of metal film can reach over 100 million times
Lightweight design: 30% -50% lighter than gear couplings

Key design parameters

Torque capacity: peak torque and sustained torque need to be considered
Speed limit: related to coupling size and balance level
Environmental adaptability: The temperature range is usually -40 ° C to+120 ° C
Shaft hole form: taper sleeve type, keyway type or clamping type

Selection steps

Determine application scenarios and load characteristics
Calculate the required torque (considering service factor)
Assess the situation of misalignment
Choose appropriate size and material
Verify speed limit
Consider special environmental requirements (corrosion, explosion prevention, etc.)

Application field

industrial sector
Power generation equipment: connection between steam turbine and generator
Petrochemical industry: compressor, pump unit transmission
Shipbuilding industry: main propulsion system, auxiliary equipment

High precision field
Machine tool industry: CNC machine tool spindle drive
Semiconductor equipment: precision motion control
Robotics Technology: Joint Transmission System

Special environmental applications
Wind power industry: wind turbine transmission system
Aerospace: Auxiliary Power Unit

Correct installation steps
Clean the contact surface between the shaft and coupling
Check the alignment of the axis (it is recommended to use a laser alignment device)
Tighten bolts according to torque requirements
Perform static and dynamic balance checks
Trial operation and monitoring of vibration conditions

Maintenance precautions
Regularly check the tightening status of bolts
Monitor vibration and noise changes
Check if there are cracks or deformations in the membrane
Avoid overloading and impact loads

With the deepening development of industry, double diaphragm couplings will continue to play an important role in the field of precision transmission, and their design concepts and technological innovations will continue to drive the progress of the entire transmission industry.