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EJH 025 Frame
The EJH is an ideal fit for machine builders transitioning from mechanical or hydraulic systems to all-electric servo drives. Unlike traditional worm gearhead out on the market, the EJH utilizes a globoidal gear mesh, resulting in 300% shock load capacity and a quiet, smooth-running drive.
With torque capability up to 7800 in. lb. and backlash as low as 6 arc-min, the EJH is well suited for metals, plastics or rubber processing machinery applications requiring a robust, compact solution. NIDEC DTC can customize this product to fit your needs by offering a variety of solid shaft, hollow shaft or shrink disc output mounting options.
Technical Data
EJH 025 Frame Size, 1 Stage Specifications
| Ratio | Unit | Note | 5 | 6 | 7 | 8 | 9 | 10 | 15 | 20 | 25 | 30 | 40 | 50 | 60 |
| Nominal Output Torque | [Nm] | – | 120 | 133 | 140 | 148 | 151 | 155 | 161 | 159 | 159 | 152 | 145 | 140 | 134 |
| Maximum Acceleration Torque | [Nm] | – | 167 | 184 | 194 | 205 | 209 | 214 | 222 | 217 | 217 | 208 | 198 | 191 | 183 |
| Emergency Stop Torque | [Nm] | – | 746 | 802 | 825 | 859 | 870 | 881 | 881 | 847 | 791 | 780 | 678 | 621 | 610 |
| No Load Running Torque | [Nm] | *1 | 2.72 | 2.72 | 2.72 | 2.72 | 2.72 | 2.72 | 2.72 | 2.72 | 2.72 | 2.72 | 2.72 | 2.72 | 2.72 |
| Nominal Input Speed | [rpm] | – | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 | 2,000 |
| Max Continuous Input Speed | [rpm] | – | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 |
| Maximum Cyclic Input Speed | [rpm] | – | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 |
| Maximum Radial Load | [N] | *2 | 8,890 | 8,890 | 8,890 | 8,890 | 8,890 | 8,890 | 8,890 | 8,890 | 8,890 | 8,890 | 8,890 | 8,890 | 8,890 |
| Maximum Axial Load | [N] | *3 | 1,860 | 1,860 | 1,860 | 1,860 | 1,860 | 1,860 | 1,860 | 1,860 | 1,860 | 1,860 | 1,860 | 1,860 | 1,860 |
| Moment of Inertia (≤ Ø19) | [kgcm2] | – | 5.42 | 4.66 | 4.20 | 3.90 | 3.69 | 3.53 | 3.20 | 3.07 | 3.02 | 2.99 | 2.96 | 2.94 | 2.93 |
| Moment of Inertia (≤ Ø28) | [kgcm2] | – | 6.24 | 5.48 | 5.02 | 4.72 | 4.51 | 4.36 | 4.02 | 3.89 | 3.84 | 3.81 | 3.78 | 3.76 | 3.75 |
| Moment of Inertia (≤ Ø38) | [kgcm2] | – | 11.8 | 11.1 | 10.6 | 10.3 | 10.1 | 9.94 | 9.60 | 9.47 | 9.42 | 9.39 | 9.36 | 9.34 | 9.33 |
| Efficiency | [%] | *4 | 92 | 92 | 91 | 91 | 90 | 90 | 88 | 85 | 84 | 80 | 76 | 73 | 70 |
| Torsional Rigidity | [Nm/arcmin] | – | 23.1 | 23.1 | 23.1 | 23.1 | 23.1 | 23.1 | 23.1 | 23.1 | 23.1 | 23.1 | 23.1 | 23.1 | 23.1 |
| Max Torsional Backlash (Standard) | [Arc-min] | – | ≤19 | ≤19 | ≤19 | ≤19 | ≤19 | ≤19 | ≤19 | ≤19 | ≤19 | ≤19 | ≤19 | ≤19 | ≤19 |
| Max Torsional Backlash (Low) | [Arc-min] | – | ≤ 9 | ≤ 9 | ≤ 9 | ≤ 9 | ≤ 9 | ≤ 9 | ≤ 9 | ≤ 9 | ≤ 9 | ≤ 9 | ≤ 9 | ≤ 9 | ≤ 9 |
| Noise Level | dB [A] | *5 | ≤ 80 | ≤ 80 | ≤ 80 | ≤ 80 | ≤ 80 | ≤ 80 | ≤ 80 | ≤ 80 | ≤ 80 | ≤ 80 | ≤ 80 | ≤ 80 | ≤ 80 |
| Ambient Temperature | [°C] | – | -25~100 | -25~100 | -25~100 | -25~100 | -25~100 | -25~100 | -25~100 | -25~100 | -25~100 | -25~100 | -25~100 | -25~100 | -25~100 |
| Permitted Housing Temperature | [°C] | – | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Protection Class | – | – | IP65 | IP65 | IP65 | IP65 | IP65 | IP65 | IP65 | IP65 | IP65 | IP65 | IP65 | IP65 | IP65 |
| Lubrication | – | – | Synthetic Oil | Synthetic Oil | Synthetic Oil | Synthetic Oil | Synthetic Oil | Synthetic Oil | Synthetic Oil | Synthetic Oil | Synthetic Oil | Synthetic Oil | Synthetic Oil | Synthetic Oil | Synthetic Oil |
| Service Life | [Hours] | – | 25,000 | 25,000 | 25,000 | 25,000 | 25,000 | 25,000 | 25,000 | 25,000 | 25,000 | 25,000 | 25,000 | 25,000 | 25,000 |
| Weight | [kg] | *6 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
- Torque at no load applied to the input shaft at 2,000 rpm
- The maximum radial load the gearbox can accept
- The maximum axial load the gearbox can accept
- The efficiency at the nominal output torque rating
- Measured with no load applied to the input shaft at 2,000 rpm
- Weight may vary slightly between models
EJH 025 Dimensions – Hollow Output Shaft
| Frame Size | Unit | Note | EJH 025 |
| L1 | [mm] | – | 13.5 |
| L2 | [mm] | – | 3 |
| L3 | [mm] | – | 49 |
| L4 | [mm] | – | 60.5 |
| L5 | [mm] | – | 148 |
| L6 | [mm] | – | 38 |
| L7 | [mm] | – | 65 |
| L8 | [mm] | – | 191 |
| L9 | [mm] | – | 76 |
| L10 | [mm] | – | 115 |
| L11 | [mm] | – | 63.5 |
| L12 | [mm] | – | 93 |
| L13 | [mm] | *1 | 137.5 – 149.5 |
| L14 | [mm} | – | 79 |
| L15 | [mm] | – | 38.5 |
| L16 | [mm] | – | 10 |
| D1 ±0.03 | [mm] | – | Ø 107.11 |
| D2 | [mm] | – | Ø 125.5 |
| D3 (h7) | [mm] | – | Ø 35 |
| T1 | [mm] | – | 4xM10X15 |
| T2 | [mm] | – | 8XM8 Bolts |
| V1~V9 | [mm] | *2 | Motor attachment dimensions are made to fit your servo motor. |
EJH 025 Dimensions – Solid Output Shaft
| Frame Size | Unit | Note | EJH 025 |
| L1 | [mm] | – | 40 |
| L2 | [mm] | – | 3 |
| L3 | [mm] | – | 55 |
| L4 | [mm] | – | 49 |
| L5 | [mm] | – | 65.5 |
| L6 | [mm] | – | 121.5 |
| L7 | [mm] | – | 187 |
| L8 | [mm] | – | 38 |
| L9 | [mm] | – | 65 |
| L10 | [mm] | – | 191 |
| L11 | [mm] | – | 76 |
| L12 | [mm] | – | 115 |
| L13 | [mm] | – | 63.5 |
| L14 | [mm} | – | 93 |
| L15 | [mm] | *1 | 137.5 – 149.5 |
| L16 | [mm] | – | 79 |
| L17 | [mm] | – | 33 |
| L18 | [mm] | – | 8 |
| D1 | [mm] | – | Ø 125.5 |
| D2 (k6) | [mm] | – | Ø 30 |
| T1 | [mm] | – | 4xM10x15 |
| T2 | [mm] | – | 8xM8 Bolts |
| V1 ~ V9 | [mm] | *2 | Motor attachment dimensions are made to fit your servo motor. |
EJH 025 Dimensions – Hollow Output with Shrink Disk
| Frame Size | Unit | Note | EJH 025 |
| L1 | [mm] | – | 13.5 |
| L2 | [mm] | – | 3 |
| L3 | [mm] | – | 48.5 |
| L4 | [mm] | – | 49 |
| L5 | [mm] | – | 60.5 |
| L6 | [mm] | – | 183 |
| L7 | [mm] | – | 38 |
| L8 | [mm] | – | 65 |
| L9 | [mm] | – | 191 |
| L10 | [mm] | – | 76 |
| L11 | [mm] | – | 115 |
| L12 | [mm] | – | 63.5 |
| L13 | [mm] | – | 93 |
| L14 | [mm} | *1 | 137.5 – 149.5 |
| L15 | [mm] | – | 79 |
| D1 ±0.03 | [mm] | – | Ø 107.11 |
| D2 | [mm] | – | Ø 125.5 |
| D3 (h7) | [mm] | – | Ø 35 |
| T1 | [mm] | – | 4xM10x15 |
| T2 | [mm] | – | 8xM8 Bolts |
| V1 ~ V9 | [mm] | *2 | Motor attachment dimensions are made to fit your servo motor. |
EJH 025 Dimensions – Optional Mounting Flange (*1)
| Frame Size | Unit | Note | EJH 025 |
| L1 | [mm] | – | 33 |
| L2 | [mm] | – | 8 |
| L3 | [mm] | – | 38.5 |
| L4 | [mm] | – | 10 |
| L5 | [mm] | – | 89 |
| L6 | [mm] | – | 32 |
| L7 | [mm] | – | 13 |
| L8 | [mm] | – | 55.0 |
| L9 | [mm] | – | 3 |
| L10 | [mm] | – | 40 |
| L11 | [mm] | – | 5 |
| L12 | [mm] | – | 15.5 |
| D1 (k6) | [mm] | – | Ø 30 |
| D2 (h7) | [mm] | – | Ø 35 |
| D3 | [mm] | – | Ø 12 |
| D4 | [mm] | – | Ø 210 |
| D5 | [mm] | – | Ø 235 |
| D6 ±0.03 | [mm] | – | Ø 168.30 |