Description
The DN Series Helical Planetary Gearbox is the high-performance choice in the current Vallder planetary gearbox range for CNC axes, servo positioning systems and automation equipment where smoother torque transmission, lower backlash, higher shaft-load capability and higher input speed are required. Unlike the PF, PL and PLR families, which use straight-tooth gearing, the DN Series uses helical tooth geometry so engagement develops progressively across the tooth face instead of arriving across the full face at once. This progressive overlap reduces tooth-entry shock and mesh excitation, supporting smoother, quieter running and more stable motion at speed.
For the DN60 and DN90 frames offered here, the supplier data is especially strong: single-stage B2 backlash is specified at ≤5 arcmin, torsional stiffness reaches 7 / 14 N·m/arcmin, maximum radial load reaches 1530 / 3250 N, and maximum input speed is 10,000 / 8,000 rpm. The series also retains practical machine-builder features including IP65 protection, synthetic grease lubrication, installation in any mounting direction, 20,000-hour specified service life and ≥96% single-stage efficiency.
Available DN Series Variants
Select the gearbox by motor type, flange size and reduction ratio. The table below lists the Vallder variants for this product.
| Model | Motor Type | Flange | Ratio | 3D Model | PDF Drawing | SKU |
| DN60-L1-B2-57-3:1 – NEMA23 | Stepper | 57 / NEMA23 | 3:1 | 3D ZIP | 1254025 | |
| DN60-L1-B2-57-5:1 – NEMA23 | Stepper | 57 / NEMA23 | 5:1 | 3D ZIP | 1254026 | |
| DN60-L1-B2-57-7:1 – NEMA23 | Stepper | 57 / NEMA23 | 7:1 | 3D ZIP | 1254027 | |
| DN60-L1-B2-57-10:1 – NEMA23 | Stepper | 57 / NEMA23 | 10:1 | 3D ZIP | 1254028 | |
| DN90-L1-B2-86-3:1 – NEMA34 | Stepper | 86 / NEMA34 | 3:1 | 3D ZIP | 1254029 | |
| DN90-L1-B2-86-5:1 – NEMA34 | Stepper | 86 / NEMA34 | 5:1 | 3D ZIP | 1254030 | |
| DN90-L1-B2-86-7:1 – NEMA34 | Stepper | 86 / NEMA34 | 7:1 | 3D ZIP | 1254031 | |
| DN90-L1-B2-86-10:1 – NEMA34 | Stepper | 86 / NEMA34 | 10:1 | 3D ZIP | 1254032 | |
| DN60-L1-B2-3:1 – Servo | Servo | 60 | 3:1 | 3D ZIP | 1254097 | |
| DN60-L1-B2-5:1 – Servo | Servo | 60 | 5:1 | 3D ZIP | 1254098 | |
| DN60-L1-B2-7:1 – Servo | Servo | 60 | 7:1 | 3D ZIP | 1254099 | |
| DN60-L1-B2-10:1 – Servo | Servo | 60 | 10:1 | 3D ZIP | 1254100 | |
| DN90-L1-B2-3:1 – Servo | Servo | 90 | 3:1 | 3D ZIP | 1254101 | |
| DN90-L1-B2-5:1 – Servo | Servo | 90 | 5:1 | 3D ZIP | 1254102 | |
| DN90-L1-B2-7:1 – Servo | Servo | 90 | 7:1 | 3D ZIP | 1254103 | |
| DN90-L1-B2-10:1 – Servo | Servo | 90 | 10:1 | 3D ZIP | 1254104 | |
| All product data (pictures, dimensions, tables, drawings) are provided as received from the supplier; we exclude liability for their accuracy or completeness. | ||||||
Why Helical Gearing Changes the Motion Quality
The defining engineering difference of the DN Series is its helical tooth engagement. Straight spur teeth enter mesh essentially across the tooth face at once, which creates a sharper change in mesh stiffness and a stronger tooth-entry impulse. Helical teeth are angled, so contact begins progressively and travels across the face. Because engagement overlaps from one tooth pair to the next, torque transfer is more continuous and the load is shared over a longer effective contact path.
- Smoother torque transfer: Progressive tooth engagement reduces the abrupt load pickup associated with straight-cut gear teeth.
- Lower vibration excitation: More gradual mesh stiffness changes reduce the tendency to excite gearbox housing and machine structure.
- Quieter running behavior: Helical gearing is generally preferred where reduced gear-mesh noise and smoother high-speed operation matter.
- Higher effective tooth contact: Overlapping engagement lets more tooth contact contribute to load transmission at the same time.
- Better high-speed behavior: The DN60 / DN90 data supports up to 10,000 / 8,000 rpm maximum input speed.
Engineering note: Helical tooth geometry also generates axial thrust. This is a normal characteristic of helical gearing and is one reason bearing support and gearbox construction matter. The DN Series supplier data specifies substantially higher allowable radial and axial output loads than the PF, PL and PLR products compared below.
DN60 / DN90 Dimensions
The dimensional drawing supplied for this product shows the DN Series output, input and side-view reference geometry. All dimensions are in millimetres unless otherwise specified. The supplier notes that the input-side dimensions depend on the mounted motor type; where Stage 1 and Stage 2 values are given, both are retained in the table below.
| Dimension | DN60 | DN90 | ||
| Stage 1 | Stage 2 | Stage 1 | Stage 2 | |
| D1 | 70 | 100 | ||
| D2 | 5.5 | 6.6 | ||
| D3 j6 | 16 | 22 | ||
| D4 g6 | 50 | 80 | ||
| D5 | 18 | 30 | ||
| D6 | M5×0.8P | M8×1.25P | ||
| D7 | 80 | 116 | ||
| L1 | 60 | 90 | ||
| L2 | 37 | 48 | ||
| L3 | 6 | 10 | ||
| L4 | 1.5 | 1.5 | ||
| L5 | 25 | 32 | ||
| L6 | 2 | 3 | ||
| L7 | 7 | 8 | ||
| L8 | 39.5 | 71.5 | 78.5 | 116 |
| L9 | 4.8 | 7.2 | ||
| L10 | 12.5 | 19 | ||
| B1 h9 | 6 | 6 | ||
| H1 | 18 | 24.5 | ||
| C1 | 70 | 90 | ||
| C2 | M4×0.7P | M5×0.8P | ||
| C3 | ≤14 / ≤16 | ≤19 / ≤24 | ||
| C4 | 35 | 46.5 | ||
| C5 | 50 | 70 | ||
| C6 | 3.5 | 6 | ||
| C7 | 60 | 80 | ||
| C8 | 46 | 30 | ||
| C9 | 110 | 135 | 154 | 189 |
| All product data (pictures, dimensions, tables, drawings) are provided as received from the supplier; we exclude liability for their accuracy or completeness. | ||||
Input-side dimensions depend on the mounted motor type. Verify the selected Stepper or Servo motor-side interface before final machine design.
DN60 / DN90 Single-Stage Technical Data
The table below focuses on the DN60 and DN90 frames used by the Vallder L1 / B2 variants. It combines the operating limits most relevant to CNC axis sizing and motion-system integration.
| Parameter | DN60 | DN90 |
| Nominal input speed | 5000 rpm | 4000 rpm |
| Maximum input speed | 10000 rpm | 8000 rpm |
| Backlash, B2, 1 stage | ≤5 arcmin | ≤5 arcmin |
| Torsional stiffness | 7 N·m/arcmin | 14 N·m/arcmin |
| Maximum radial force | 1530 N | 3250 N |
| Maximum axial force | 630 N | 1300 N |
| Maximum output torque | 2.5 × nominal output torque | 2.5 × nominal output torque |
| Service life | 20000 h | 20000 h |
| Efficiency, 1 stage | ≥96% | ≥96% |
| Operating temperature | -10°C to +90°C | -10°C to +90°C |
| Degree of protection | IP65 | IP65 |
| Mounting position | Any direction | Any direction |
| Lubrication | Synthetic lubricating grease | Synthetic lubricating grease |
| Noise | ≤58 dB(A) | ≤60 dB(A) |
| Vallder variant weight | 1.5 kg | 3.7 kg |
| All product data (pictures, dimensions, tables, drawings) are provided as received from the supplier; we exclude liability for their accuracy or completeness. | ||
The supplier notes that continuous operation can reduce the stated service life by 50%.
Ratio-Specific Torque and Input Inertia
For the four single-stage ratios sold on this product page, the supplier data gives the following nominal output torque and input-shaft moment of inertia values.
| Ratio | DN60 Nominal Torque | DN90 Nominal Torque | DN60 Inertia | DN90 Inertia |
| 3:1 | 55 N·m | 130 N·m | 0.16 kg·cm² | 0.61 kg·cm² |
| 5:1 | 60 N·m | 160 N·m | 0.13 kg·cm² | 0.47 kg·cm² |
| 7:1 | 50 N·m | 140 N·m | 0.13 kg·cm² | 0.45 kg·cm² |
| 10:1 | 40 N·m | 100 N·m | 0.13 kg·cm² | 0.40 kg·cm² |
| All product data (pictures, dimensions, tables, drawings) are provided as received from the supplier; we exclude liability for their accuracy or completeness. | ||||
DN vs PF, PL and PLR: What You Gain
DN is the performance-focused option in this gearbox group. Its helical tooth geometry, lower backlash, higher torsional stiffness and much greater allowable shaft loading make it particularly suitable for CNC and automation axes where positioning quality and rigidity matter. PF and PL remain practical straight-tooth inline solutions, while PLR is the compact 90° option when installation geometry is the main priority.
| Selection Point | DN60 / DN90 | PF60 / PF90 & PL60 / PL90 | PLR60 / PLR90 |
|---|---|---|---|
| Gear tooth geometry | Helical, progressive overlap | Straight tooth | Straight tooth, 90° layout |
| 1-stage backlash | ≤5 / ≤5 arcmin | ≤14 / ≤10 arcmin | ≤16 / ≤12 arcmin |
| Torsional stiffness | 7 / 14 N·m/arcmin | 1.8 / 4.85 N·m/arcmin | 1.8 / 4.85 N·m/arcmin |
| Maximum radial force | 1530 / 3250 N | 240 / 450 N | 240 / 450 N |
| Maximum axial force | 630 / 1300 N | 220 / 430 N | 220 / 430 N |
| Nominal input speed | 5000 / 4000 rpm | 4000 / 3500 rpm | 4000 / 3500 rpm |
| Maximum input speed | 10000 / 8000 rpm | 8000 / 6000 rpm | 8000 / 6000 rpm |
| Specified noise | ≤58 / ≤60 dB(A) | ≤58 / ≤60 dB(A) | ≤61 / ≤63 dB(A) |
| Layout | Inline, heavy-load output | Inline | 90° right-angle |
Comparison uses the supplier data already published on the corresponding Vallder product pages for 1265000, 1265001 and 1265002, together with the DN supplier data supplied for this product.
Choose DN when: low backlash, higher torsional rigidity, stronger pulley or pinion loads, higher motor speed and smoother helical engagement are the main design priorities.
Choose PF or PL when: a simpler straight-tooth inline reducer is sufficient for the required load and positioning accuracy. Choose PLR when: a compact 90° motor arrangement is more important than the DN Series performance advantages.
High-Performance CNC and Automation Applications
The DN Series is particularly well matched to CNC and automation axes where the gearbox is asked to do more than reduce speed. Its combination of low B2 backlash, higher torsional stiffness and strong radial/axial load ratings is valuable when the gearbox output directly carries a timing pulley, belt drive, pinion, coupling or other machine element that imposes external force on the output shaft.
- CNC rack-and-pinion axes: Strong radial load capacity and low backlash support rigid drive transmission at the pinion.
- Servo positioning systems: Helical engagement and higher torsional stiffness support smoother reversal and more stable load response.
- High-speed automation: Higher allowable input speed expands the operating range for fast servo-driven mechanisms.
- Rotary and indexing mechanisms: Low backlash helps reduce lost motion where repeatable angular positioning is important.
- Machine-tool and router axes: IP65 protection, grease lubrication and any-direction mounting simplify practical machine integration.
DN Series Gearbox Video
Watch the same planetary gearbox overview used on the related Vallder gearbox pages for a visual reference to gearbox construction and machine-integration concepts.
FAQ frequently asked questions
What is the biggest advantage of the DN Series over PF and PL?
The DN Series combines helical tooth engagement with substantially lower B2 backlash, higher torsional stiffness, higher allowable input speed and much higher radial and axial output-load ratings in the DN60 and DN90 frames.
Why do helical gears run more smoothly than straight gears?
Helical teeth enter mesh progressively across the tooth face. The overlap transfers load more gradually from one tooth pair to the next, reducing the abrupt tooth-entry excitation associated with straight-cut gearing.
Is the DN Series actually quieter than the straight PF and PL models?
Helical geometry inherently supports smoother, lower-impact tooth engagement. For the published DN60 / DN90 frames, the supplier noise limits are ≤58 / ≤60 dB(A), which are numerically the same published limits as PF60 / PF90 and PL60 / PL90, but lower than the PLR60 / PLR90 limits.
Which DN ratio should I choose?
Choose 3:1, 5:1, 7:1 or 10:1 from the required output speed, torque, inertia matching and positioning behavior. The ratio-specific torque and input-inertia table above should be used together with the motor operating point.
Can DN60 and DN90 be used with both Stepper and Servo motors?
Yes. The listed DN60 variants cover 57 mm / NEMA23 Stepper and 60 mm Servo interfaces, while DN90 covers 86 mm / NEMA34 Stepper and 90 mm Servo interfaces.
When should I choose PLR instead of DN?
Choose PLR when a 90° right-angle motor layout is required to reduce installation depth along the driven axis. Choose DN when inline installation is acceptable and the priority is lower backlash, higher stiffness, stronger shaft-load capability and helical mesh behavior.
