High-Precision Inline Planetary Gearbox

Product Overview

The High-Precision Inline Planetary Gearbox is engineered for servo and stepper motor motion control systems requiring rigorous positional accuracy, high torsional rigidity, and compact space utilization. By distributing the transmission load across multiple planetary gears, this coaxial gearbox achieves optimal torque density and minimal backlash. It serves as a critical mechanical interface between high-speed electric motors and heavy-load industrial mechanisms, ensuring smooth motion transmission and precise angular positioning in automated machinery.

Key Features

Low Backlash Design: Precision-machined helical or spur planetary gear trains maintain minimal angular play (as low as $\le 3\text{ arcmin}$ for single-stage), preventing motion lag during frequent directional changes.

High Torque Density: Multi-tooth simultaneous meshing distributes mechanical stress across planet gears, allowing compact housing dimensions to transmit significantly higher torque than standard spur gearboxes.

Optimized Efficiency: Hardened alloy steel gears combined with synthetic high-viscosity grease lubrication achieve up to 97% single-stage transmission efficiency, minimizing thermal energy loss.

Universal Motor Adaptation: Modular adapter bushings and flexible flange interfaces accommodate standard servo and stepper motors from global manufacturers without custom mechanical modifications.

Sealed Maintenance-Free Operation: IP65 protection rating with high-temperature oil seals prevents particulate ingress and lubricant leakage throughout the operational lifecycle.

Technical Specifications

Technical Parameter	Single-Stage (L1)	Two-Stage (L2)	Three-Stage (L3)
Gear Ratio ($i$)	3, 4, 5, 7, 10	15, 20, 25, 35, 50, 70, 100	140 to 1000
Nominal Output Torque ($N\cdot m$)	14 – 180	35 – 450	90 – 1200
Emergency Stop Torque	3x Nominal Torque	3x Nominal Torque	3x Nominal Torque
Backlash (arcmin)	<= 3 (Precision), <= 5 (Standard)	<= 5 (Precision), <= 8 (Standard)	<= 8 (Precision), <= 10 (Standard)
Max. Input Speed ($rpm$)	5,000 – 8,000	4,000 – 6,000	3,000 – 5,000
Torsional Rigidity ($N\cdot m/arcmin$)	2.5 – 45	3.0 – 50	3.5 – 55
Operating Temperature (°C)	-25 deg C to +90 deg C	-25 deg C to +90 deg C	-25 deg C to +90 deg C
Protection Class	IP65	IP65	IP65
Design Life ($h$)	>= 20,000 hours	>= 20,000 hours	>= 20,000 hours

Available Configurations

Frame Sizes (Flange Dimensions): 42mm, 60mm, 90mm, 115mm, 142mm, 180mm, 220mm.

Output Shaft Types: Keyed shaft, smooth shaft, splined shaft, and output flange (ISO 9409 mounting pattern for heavy radial loads).

Gear Geometry: Precision spur gears for standard cost-effective applications; helical gears for high-speed, ultra-low noise, and higher contact ratio requirements.

Input Configurations: Clamping ring input shaft with balanced dynamic collar for secure servo motor attachment.

Applications

Industrial Robotics: Articulated robot joints and SCARA robot axis drives requiring backlash-free path control.

CNC Machine Tools: Tool changers, rotary axes, and auxiliary feed mechanisms.

Automation & Material Handling: Automated Guided Vehicles (AGVs), Autonomous Mobile Robots (AMRs), and high-speed conveyor indexing units.

Semiconductor Equipment: Wafer handling mechanisms and precise positioning stages.

Packaging & Printing Machinery: Multi-axis synchronous cutting, filling, and labeling heads.

Selection Guide

To ensure optimal mechanical performance and prevent premature wear, evaluate the following parameters during selection:

Calculate Torque Requirements: Ensure the maximum load torque during acceleration and deceleration does not exceed the gearbox's allowable emergency stop torque. Verify that continuous operating torque remains below the nominal output torque table value.

Determine Gear Ratio: Divide the required machine output speed into the nominal operating speed of your servo motor (i = N_motor / N_machine).

Check Backlash Limits: Match the application's positional accuracy tolerance to the gearbox backlash class (<= 3 arcmin for high-precision servo applications; <= 8 arcmin for general automation).

Radial and Axial Load Limits: If belt drives or pinions are mounted directly on the output shaft, calculate the overhang load and verify it against the manufacturer's bearing capacity limits.

Motor Shaft Dimensional Fit: Confirm motor shaft diameter and pilot hole dimensions to select the correct input adapter sleeve.

Manufacturing & Quality Control

Material & Heat Treatment: Gear components are manufactured from high-grade chromium-molybdenum-titanium alloy steel (20CrMnTi), carburized and quenched to a surface hardness of HRC58–62 with a case depth of 0.8–1.2mm.

Machining Precision: Gear teeth hobbing and profile grinding are executed on CNC gear hobbing and grinding machinery, achieving DIN 5 gear quality accuracy.

Testing & Inspection Protocol: Every gearbox undergoes 100% factory testing using computerized dynamometers and laser interferometers to measure actual backlash, starting torque, transmission efficiency, and noise emission levels under full load.

FAQ

Q: How do I match this gearbox with my specific servo motor brand?

A: Provide your servo motor's outline drawing and shaft dimensions (motor shaft diameter, length, pilot diameter, and mounting PCD). We configure the matching input flange and bushing sleeve for direct bolt-on installation.

Q: Can this gearbox be mounted in any spatial orientation?

A: Yes. Fully sealed grease lubrication allows horizontal, vertical, or inclined mounting positions without lubricant leakage or bearing starvation.

Q: What is the difference between single-stage and two-stage gearboxes?

A: Single-stage gearboxes (L1) cover ratios from 3:1 to 10:1 with higher efficiency and lower backlash. Two-stage gearboxes (L2) provide larger ratios from 15:1 to 100:1 by incorporating an intermediate planetary carrier set.

RFQ / Custom Requirement CTA

Submit your technical parameters (Motor model, required output torque, target gear ratio, and annual volume) to receive a confirmed CAD drawing, technical data sheet, and commercial quotation within 24 hours. Custom flange and non-standard shaft modifications are available upon request.
Key Adjustments Made:
Added Section 3 CTA: Placed interactive buttons for downloading .STEP 3D CAD files and PDF technical datasheets directly beneath the technical parameters table.
Added Section 7 Visual Indicators: Inserted dedicated image slots and descriptive figure captions showing CNC gear grinding and laser backlash testing to visually reinforce manufacturing quality.

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