DJM diaphragm coupling

DJM Diaphragm Coupling – High-Precision Flexible Coupling for Critical Power Transmission

Product Overview

The DJM Diaphragm Coupling is an advanced, maintenance-free coupling designed for high-speed, high-torque applications requiring precise motion control and exceptional reliability. Utilizing flexible metal diaphragms instead of elastomeric elements, this coupling delivers zero-backlash performance with outstanding misalignment compensation capabilities, making it ideal for turbomachinery, marine propulsion, and precision servo systems.

Core Technology & Design Features

1. Multi-Diaphragm Flexible Design

Stainless steel diaphragms (AISI 316L/17-4PH) in parallel or conical configurations

Laminated stress-relieved construction for optimal fatigue resistance

Precision laser-welded assemblies ensuring consistent performance

2. Performance Characteristics

True zero-backlash (<0.01 arc-min) for positioning accuracy

Torsional stiffness: 500–50,000 Nm/rad (adjustable via diaphragm thickness)

Angular misalignment capacity: Up to 1.5° per diaphragm set

Axial compensation: ±5mm (series-dependent)

3. Specialized Material Options

Titanium alloys for weight-critical aerospace applications

Inconel 718 for high-temperature operation (up to 650°C)

Electrically insulating coatings for galvanic isolation

Technical Specifications

Mechanical Performance

Torque range: 100Nm–2,000kNm

Max speed: 40,000 rpm (balanced to API 671 standards)

Moment of inertia: Optimized for servo applications

Environmental Durability

Corrosion resistance: ASTM G85 salt spray tested

Temperature range: -200°C to +650°C (material dependent)

Explosion-proof versions available (ATEX/IECEx certified)

Application-Specific Advantages

For Turbo Machinery

API 671 Chapter 7 compliant

Torsionally stiff design prevents excitation of shaft natural frequencies

In Marine Propulsion

LR/DNV/ABS class-approved

Compensates for hull deflection and bearing wear

Precision Motion Systems

Stiffness-matched variants for CNC machine tools

Non-magnetic versions for MRI equipment

Installation & Maintenance Benefits

Pre-aligned bolt holes for perfect flange concentricity

Lifetime lubrication-free operation

Laser alignment marks for quick verification

Condition monitoring ports for vibration analysis

The DJM Diaphragm Coupling represents the pinnacle of high-performance power transmission technology, combining military-grade durability with precision engineering for the most demanding applications.