Overview

This document provides comprehensive technical specifications, performance data, dimensional details, and installation guidelines for the AT Series gearboxes, covering multiple sub-series such as AT-4M, AT-L, L1, H, C, R1, LM, RM, FL, FH, FC, and others. These gearboxes are engineered for high rigidity, corrosion resistance, and optimized torque transmission in industrial and servo applications.

1. Specifications and Performance Characteristics

• Material and Construction: Single-piece stainless steel housings ensure maximum rigidity and corrosion resistance. Precision-machined surfaces facilitate easy and accurate installation.
• Gearing: High tensile carburized alloy steel gears precision ground to exceed DIN 5 standards. Spiral bevel gear sets combined with optimized planetary geometry enable gear ratios up to 500:1.
• Shafts: Stainless steel input and output shafts with multiple design options (S1 smooth, S2 keyed) to meet diverse industrial requirements.
• Performance: Nominal output torque ranges from 25 Nm to 18,000 Nm depending on model and stage. Maximum acceleration torque is typically 1.5× nominal torque. Backlash is low (≤6 arcmin standard, measured at 2% nominal torque). Operating temperature range is -30°C to +100°C. Efficiency ranges from ≥94% to ≥98% depending on model and ratio. Noise levels at 1500 rpm no load range from ≤68 dB(A) to ≤84 dB(A).
• Service Life: Rated for 10,000 hours under continuous operation (S1 duty cycle), with some models rated up to 20,000 hours.

2. Dimensional Data and Standards Compliance

• Extensive dimensional tables cover 1-stage (ratios 1–5), 2-stage (7–50), and 3-stage (75–500) gearboxes across all AT series variants.
• Key dimensions include shaft diameters (ranging from 12 mm to 280 mm), key sizes, lengths, widths, bolt hole patterns, and mounting flange dimensions, all in millimeters.
• Keyways and keys conform to DIN6885/1 standards, ensuring standardized profiles and fits.
• Shaft and bore tolerances use precision classes such as k6, h7, g6, and h9 for reliable mechanical fits.
• Motor mounting interfaces (dimensions C1 to C10 and variants) are referenced, with users advised to consult the Apexdyna.com online design tool for exact motor compatibility.
• Standard accessories include two shrink disk power lock units for secure, keyless shaft-hub connections enhancing torque transmission and assembly ease.

3. Load Capacities and Bearing Design

• Output and input shafts are designed with oversized tapered roller bearings capable of handling high radial and axial loads.
• Permissible radial loads depend on shaft position and rotational speed, with load position factors (kb) provided to adjust for off-center forces.
• Load capacities are specified to ensure bearing life exceeding 30,000 hours under recommended conditions.

4. Weight and Inertia

• Gearbox weights range from approximately 2.5 kg for smallest models to over 190 kg for largest.
• Mass moments of inertia (J1) are provided for various gear ratios and models, critical for dynamic system design and control.

5. Installation and Operating Recommendations

• Use synthetic lubrication oils as specified for maintenance-free operation over service life.
• Operate within specified temperature (-30°C to +100°C) and speed limits to avoid premature wear.
• Observe maximum radial and axial load limits on shafts to prevent damage.
• Backlash values should be considered in precision applications.
• Consult manufacturer’s online tools for motor-specific mounting dimensions to ensure proper fit.

6. Ordering Codes and Options

• Ordering codes specify gearbox size (e.g., AT065 to AT280), gear ratio (1-stage to 3-stage), gearbox type (L, H, C, R1, LM, RM, 4M, FL, FH, FC, etc.), shaft options (S1 smooth, S2 keyed), motor designation, and rotation direction.
• Example codes illustrate the format for specifying configurations.

7. Critical Parameters and Best Practices

• Adherence to DIN6885/1 for key dimensions is essential for interchangeability and mechanical reliability.
• Selection of shaft and key fits must consider operational loads and assembly tolerances.
• Use of shrink disk power lock units enhances secure mounting and torque transmission.
• Careful attention to mounting hole patterns, thread sizes, and dimensional tolerances is necessary for proper installation and maintenance.
• Load calculations must incorporate shaft position and load factors to avoid bearing failure.

Conclusion

The AT Series gearboxes provide a robust, versatile solution for industrial and servo applications requiring precise torque transmission and speed reduction. Their stainless steel construction, precision gearing, and comprehensive dimensional data support reliable integration and long service life. Compliance with DIN standards and use of advanced bearing and mounting technologies ensure high performance and ease of assembly. This document serves as a detailed reference for engineers and technicians involved in design, selection, and installation of these gearboxes and related mechanical components.