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DMP Series Double Diaphragm Coupling

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  • DMP Series Double Diaphragm Coupling
DMP Series Double Diaphragm Coupling

DMP Series Double Diaphragm Coupling

The DMP Series Double Diaphragm Coupling is a full-metal, zero-backlash coupling with a double diaphragm assembly and an intermediate shaft. It connects two independent sets of high-strength stainless steel diaphragms via a rigid intermediate shaft between two aluminum alloy hubs. This "three-part" structure allows it to compensate for deviations, particularly angular and axial misalignment, several times better than single-diaphragm couplings, while maintaining zero backlash and high rigidity. It is designed for demanding applications with long spans, high misalignment risks, or requiring significant axial displacement compensation.

Inquiry
PREV: PXQ Series Parallel Tangent Elastic Coupling Next: SMP Series High Torque Single Diaphragm Coupling

Technology

The DMP series is a functionally enhanced version of single-diaphragm couplings, with its core advantages being "greater adaptability" and "more stable performance."

Characteristic dimensions DMP Series Double-Diaphragm Couplings SMP Series Single-Diaphragm Couplings Comparison of Application Scenarios
Core positioning The premier compensation solution for large misalignments and long spans. A standard servo solution offering high precision and high dynamic performance. DMP is used for challenging installations, whilst SMP is used for ideal or controlled installations.
Offset compensation capability Extremely high, with significantly enhanced angular and axial compensation capabilities in particular. The two sets of diaphragms can absorb greater misalignment, and the intermediate shaft allows for greater axial movement. High, suitable for typical installation misalignments. Where there are significant parallelism or angular errors between the two shafts, or where axial displacement caused by thermal expansion of the equipment is significant, DMP must be selected.
System stiffness High. Although an additional component has been added, the all-metal rigid connection ensures high torsional stiffness. Its axial stiffness may be slightly lower than that of the SMP (due to the allowance for greater axial displacement). Extremely high, providing the most direct power transmission. Within the permissible tolerance range, the dynamic response of SMP is slightly superior to that of DMP.
Resistance to off-centre loading Greater durability. The double-diaphragm structure better distributes the alternating stresses caused by persistent misalignment, typically resulting in a longer service life under misaligned operating conditions. High, but the single diaphragm assembly experiences more concentrated stress under sustained large misalignments. For applications involving long-term, unavoidable misalignment, DMP is the more reliable choice.
Inertia and complexity Slightly higher. Due to the addition of the intermediate shaft, the moment of inertia is slightly greater and the structure is slightly longer. Low, with the most compact design. In situations where space is extremely limited or where extremely low inertia is required, the SMP offers greater advantages.

Main Technical Parameters and Design

1. Structural Analysis:
Double diaphragm assembly: Two independent sets of diaphragms compensate for deviations at both connection points, breaking down and managing complex combined deviations.
Intermediate shaft: As a rigid connecting body, its length can be customized as needed, and is crucial for handling long spans (where the motor and load are far apart).

2. Core Performance:
Ultra-large compensation capacity: Its allowable angular deviation is typically more than twice that of comparable SMP couplings, and the axial compensation capacity is also significantly increased.
Maintenance and balancing: All-metal, maintenance-free. The intermediate shaft and end components can be individually dynamically balanced to ensure overall smooth high-speed operation.

3. Selection Criteria:
The DMP series should be prioritized when the application involves the following situations:
Large equipment base span, making it difficult to ensure high coaxiality during installation.
Significant thermal expansion during equipment operation, leading to large changes in shaft end position.
Risk of unavoidable soft foundation settlement or structural deformation.

Applications
The DMP series is an expert in solving the following challenging connection problems:
Large gantry machine tools: Connecting the ends of long-stroke lead screws far from the motor, compensating for bed deformation and installation errors.
Ships and heavy machinery: Connecting the engine and gearbox, dealing with foundation deformation and significant thermal displacement.
Large pumps and fans: Long shaft connection between the motor and pump body, compensating for installation misalignment and thermal expansion and contraction.
Special equipment and test benches: Transmission connections requiring simulation or tolerance of large displacement conditions. The DMP Series Double Diaphragm Coupling is a testament to engineering ingenuity.  Through a clever "divide and conquer" strategy, it transforms complex large-deviation problems into two easily manageable small deviations. It's not just a coupling; it's a systematic compensation solution for challenging connection conditions. Choosing the DMP series means you are directly addressing and perfectly resolving the unavoidable mechanical deviations in your equipment, providing the highest level of assurance for long-term stable operation, low maintenance costs, and exceptional reliability.

Parameters

Model No. d1/d2 pore size D
(mm)		 L
(mm)		 L1
(mm)		 L3
(mm)		 W
(mm)		 L2
(mm)		 d3
(mm)		 Screw size  M Tightening torque (N.m) Rated torque (N.m) Maximum torque (N.m) Maximum speed (RPM) Moment of inertia (kg·m²) Static torsional stiffness (N.m/rad) Permissible eccentricity (mm) Permissible deviation  (° ) Axial runout (mm)
Min (mm) Max (mm)
DMP-D19L26 3  8  19  26  9  9  1  6  8  M3 0.8  2  4  10000  6.7*10-7      580  0.02  1  ±0.09
DMP-D19L29 3  8  19  29  9  12  1  6  8  M3 0.8  2  4  10000  6.7*10-7      580  0.02  1  ±0.09
DMP-D19L32 3  8  19  32  12  12  1  6  8  M3 0.8  2  4  10000  6.7*10-7      580  0.02  1  ±0.09
DMP-D19L35 3  8  19  35  12  12  1  9  8  M3 0.8  2  4  10000  6.7*10-7      580  0.02  1  ±0.09
DMP-D26L35 4  10  26  35  12  12  2  7  10  M3 1.5  3.5  7  10000  1.8*10-6      1250  0.02  1  ±0.1
DMP-D26L38 4  10  26  38  12  15  2  7  10  M3 1.5  3.5  7  10000  1.8*10-6      1250  0.02  1  ±0.1
DMP-D26L41 4  10  26  41  15  15  2  7  10  M3 1.5  3.5  7  10000  1.8*10-6      1250  0.02  1  ±0.1
DMP-D26L44 4  10  26  44  15  15  2  10  10  M3 1.5  3.5  7  10000  1.8*10-6      1250  0.02  1  ±0.1
DMP-D32L41 4  15  32  41  13.5  13.5  2  10  16  M3 1.5  5  10  10000  7.2*10-6      1800  0.02  1  ±0.14
DMP-D32L44 4  15  32  44  13.5  16.5  2  10  16  M3 1.5  5  10  10000  7.2*10-6      1800  0.02  1  ±0.14
DMP-D32L47 4  15  32  47  16.5  16.5  2  10  16  M3 1.5  5  10  10000  7.2*10-6      1800  0.02  1  ±0.14
DMP-D32L50 4  15  32  50  16.5  16.5  2  13  16  M3 1.5  5  10  10000  7.2*10-6      1800  0.02  1  ±0.14
DMP-D34L45 4  14  34  45  15  15  2  11  16  M4 2.5  6  12  10000  7.2*10-6      1800  0.02  1  ±0.18
DMP-D34L50 4  14  34  50  15  20  2  11  16  M4 2.5  6  12  10000  7.2*10-6      1800  0.02  1  ±0.18
DMP-D34L55 4  14  34  55  20  20  2  11  16  M4 2.5  6  12  10000  7.2*10-6      1800  0.02  1  ±0.18
DMP-D34L60 4  14  34  60  20  20  2  16  16  M4 2.5  6  12  10000  7.2*10-6      1800  0.02  1  ±0.18
DMP-D39L49 6  19  39  49  15  15  4  11  19  M4 2.5  8  16  10000  1.8*10-5      3700  0.02  1  ±0.18
DMP-D39L54 6  19  39  54  15  20  4  11  19  M4 2.5  8  16  10000  1.8*10-5      3700  0.02  1  ±0.18
DMP-D39L59 6  19  39  59  20  20  4  11  19  M4 2.5  8  16  10000  1.8*10-5      3700  0.02  1  ±0.18
DMP-D39L64 6  19  39  64  20  20  4  16  19  M4 2.5  8  16  10000  1.8*10-5      3700  0.02  1  ±0.18
DMP-D44L50 8  22  44  50  15.5  15.5  4  11  22  M5 2.5  18  36  10000  2.8*10-5      3700  0.02  1  ±0.18
DMP-D44L55 8  22  44  55  15.5  20.5  4  11  22  M5 2.5  18  36  10000  2.8*10-5      3700  0.02  1  ±0.18
DMP-D44L60 8  22  44  60  20.5  20.5  4  11  22  M5 2.5  18  36  10000  2.8*10-5      3700  0.02  1  ±0.18
DMP-D44L65 8  22  44  65  20.5  20.5  4  16  22  M5 2.5  18  36  10000  2.8*10-5      3700  0.02  1  ±0.18
DMP-D50L57 8  26  50  57  18  18  5  11  26  M5 7  18  36  10000  2.5*10-5      3700  0.02  1  ±0.2
DMP-D50L65 8  26  50  65  18  26  5  11  26  M5 7  18  36  10000  2.5*10-5      3700  0.02  1  ±0.2
DMP-D50L73 8  26  50  73  26  26  5  11  26  M5 7  18  36  10000  2.5*10-5      3700  0.02  1  ±0.2
DMP-D50L81 8  26  50  81  26  26  5  19  26  M5 7  18  36  10000  2.5*10-5      3700  0.02  1  ±0.2
DMP-D56L63 10  30  56  63  20  20  5  13  29  M5 7  35  70  10000  1.0*10-4      8400  0.02  1  ±0.2
DMP-D56L71 10  30  56  71  20  28  5  13  29  M5 7  35  70  10000  1.0*10-4      8400  0.02  1  ±0.2
DMP-D56L79 10  30  56  79  28  28  5  13  29  M5 7  35  70  10000  1.0*10-4      8400  0.02  1  ±0.2
DMP-D56L87 10  30  56  87  28  28  5  21  29  M5 7  35  70  10000  1.0*10-4      8400  0.02  1  ±0.2
DMP-D68L74 12  35  68  74  24  24  6  14  39  M6 12  65  130  9000  1.5*10-4      11500  0.02  1  ±0.2
DMP-D68L82 12  35  68  82  24  32  6  14  39  M6 12  65  130  9000  1.5*10-4      11500  0.02  1  ±0.2
DMP-D68L90 12  35  68  90  32  32  6  14  39  M6 12  65  130  9000  1.5*10-4      11500  0.02  1  ±0.2
DMP-D68L98 12  35  68  98  32  32  6  22  39  M6 12  65  130  9000  1.5*10-4      11500  0.02  1  ±0.2
DMP-D82L98 14  45  82  98  30  30  8  22  44  M8 16  100  200  8000  1.8*10-4      14500  0.02  1  ±0.2
DMP-D82L108 14  45  82  108  30  40  8  22  44  M8 16  100  200  8000  1.8*10-4      14500  0.02  1  ±0.2
DMP-D82L118 14  45  82  118  40  40  8  22  44  M8 16  100  200  8000  1.8*10-4      14500  0.02  1  ±0.2
DMP-D82L128 14  45  82  128  40  40  8  32  44  M8 16  100  200  8000  1.8*10-4      14500  0.02  1  ±0.2
DMP-D94L100 19  50  94  100  30  30  9  22  48  M10 16  165  320  5000  1.2*10-4      40000  0.02  1  ±0.2
DMP-D94L110 19  50  94  110  30  40  9  22  48  M10 16  165  320  5000  1.2*10-4      40000  0.02  1  ±0.2
DMP-D94L120 19  50  94  120  40  40  9  22  48  M10 16  165  320  5000  1.2*10-4      40000  0.02  1  ±0.2
DMP-D94L130 19  50  94  130  40  40  9  32  48  M10 16  165  320  5000  1.2*10-4      40000  0.02  1  ±0.2
DMP-D104L102 20  55  104  102  30  30  10  22  48  M10 16  235  470  4000  1.8*10-3      80000  0.02  1  ±0.2
DMP-D104L112 20  55  104  112  30  40  10  22  48  M10 16  235  470  4000  1.8*10-3      80000  0.02  1  ±0.2
DMP-D104L122 20  55  104  122  40  40  10  22  48  M10 16  235  470  4000  1.8*10-3      80000  0.02  1  ±0.2
DMP-D104L132 20  55  104  132  40  40  10  32  48  M10 16  235  470  4000  1.8*10-3      80000  0.02  1  ±0.2

Drawings

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