Editorial Technical Reference

Gearbox / Reduction Gear

This page explains how Gearbox / Reduction Gear is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A mechanical device that reduces rotational speed while increasing torque within a hoist system.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Gearbox / Reduction Gear

Definition
A gearbox or reduction gear is a critical component of a hoist unit that transmits power from the motor to the drum or lifting mechanism. It uses gear trains to convert high-speed, low-torque input from the motor into low-speed, high-torque output required for safe and controlled lifting operations. The gearbox is typically housed in a cast iron or alloy steel enclosure, with gears made from carburized and hardened alloy steel for wear resistance. Bronze components may be used for bushings or worm gears in certain designs. The gearbox is selected based on the motor power and duty cycle, with rated power ranging from 0.75 to 75 kW. Reduction ratios from 5 to 100 allow matching the output speed to the required lifting speed, while output torque ranges from 50 to 5000 N·m. Input speeds typically range from 750 to 3000 rpm, and efficiency is between 92% and 98%. Service factors from 1.25 to 2.0 accommodate varying shock loads. Noise levels are typically 60 to 75 dB(A), and operating temperatures range from -20°C to 60°C. Ingress protection ratings from IP54 to IP65 are available for dusty or wet environments. Housing material is often HT250 cast iron, and gear material is commonly 20CrMnTi alloy steel. The weight of the gearbox ranges from 15 to 500 kg, depending on size and configuration. Verification of model-specific values and standards with the legal manufacturer or supplier is essential, as the listed parameters are reference ranges. Standards such as ISO 6336 for gear load capacity, AGMA 2001 for service factors, and IEC 60529 for ingress protection are used for procurement and verification. Always confirm the actual specifications for your application.
Working Principle
The gearbox operates on the principle of gear reduction, where a small input gear (pinion) drives a larger output gear, reducing rotational speed proportionally to the gear ratio while multiplying torque. This allows the hoist motor to operate at efficient speeds while providing the necessary force for lifting heavy loads. The gear ratio determines the trade-off between speed and torque: a higher ratio increases torque but reduces output speed. The gear train is designed to transmit power smoothly and efficiently, with minimal energy loss. Lubrication is critical to reduce friction and wear, and the operating temperature range must be maintained to ensure proper lubrication. The gearbox must be selected to match the motor speed and the required lifting speed, and the service factor should account for the duty cycle and shock loads. Proper alignment and mounting are essential to prevent premature failure.
Common Materials
Cast iron, Alloy steel, Bronze
Technical Parameters
ParameterTypical rangeNotes & selection driver
Rated Power0.75–75 kWSelect based on motor power and duty cycleISO 6336
Reduction Ratio5–100Higher ratio increases torque but reduces speed
Output Torque50–5000 N·mEnsure sufficient torque for hoisting loadISO 6336
Input Speed750–3000 rpmMatch motor speed
Efficiency92–98 %Higher efficiency reduces energy lossISO 6336
Service Factor1.25–2.0Higher factor for heavy shock loadsAGMA 2001
Noise Level60–75 dB(A)Lower noise for indoor applicationsISO 8573-1
Operating Temperature-20–60 °COutside range may affect lubrication
Ingress ProtectionIP54–IP65IP65 for dusty or wet environmentsIEC 60529
Housing MaterialHT250Cast iron for strength and dampingGB/T 9439
Gear Material20CrMnTiCarburized and hardened for wear resistanceGB/T 3077
Weight15–500 kgConsider for mounting and support

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Input Shaft Part
    Receives rotational power from the motor
    Material: Alloy steel
  • Gears Part
    Transmit and reduce speed through meshing teeth
    Material: Case-hardened steel
  • Output Shaft Part
    Delivers reduced speed and increased torque to the hoist drum
    Material: Alloy steel
  • Housing Part
    Encloses and supports all internal components, contains lubricant
    Material: Cast iron
  • Bearings
    Support rotating shafts and reduce friction
    Material: Steel with bronze cages

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Gearbox / Reduction Gear.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Ambient atmospheric pressure only (sealed housing)
other spec: Maximum input speed: 1800 RPM, Maximum output torque: 5000 Nm, Lubrication type: Synthetic gear oil ISO VG 320
temperature: -20°C to +80°C continuous operation, up to +100°C intermittent
Media Compatibility
✓ Industrial hoist systems ✓ Crane lifting mechanisms ✓ Conveyor drive applications
Unsuitable: Submerged or high-moisture environments without proper IP-rated sealing
Sizing Data Required
  • Required output torque (Nm)
  • Input speed (RPM) and required reduction ratio
  • Duty cycle and service factor (e.g., continuous vs. intermittent operation)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Bearing fatigue failure
Cause: Cyclic loading leading to subsurface crack initiation and propagation, often accelerated by improper lubrication, contamination, or misalignment
Gear tooth pitting and spalling
Cause: Surface fatigue due to high contact stresses, inadequate lubrication film thickness, or material defects, resulting in surface material removal and progressive damage
Maintenance Indicators
  • Unusual high-frequency vibration or audible grinding/clicking noises during operation
  • Visible oil leakage around seals or excessive metallic particles in lubricant analysis
Engineering Tips
  • Implement condition-based monitoring with vibration analysis and oil analysis to detect early degradation before catastrophic failure
  • Establish precise alignment procedures during installation/repair and maintain proper lubrication with filtered oil at correct viscosity and temperature

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 1328-1:2013 (Cylindrical gears - ISO system of flank tolerance classification) ANSI/AGMA 2000-A88 (Gear Classification and Inspection Handbook) DIN 3960 (Tolerances for cylindrical gear teeth)

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter tolerance: H7 (e.g., ±0.018mm for 50mm bore)
  • Tooth profile deviation: Grade 6 per ISO 1328 (typically ±0.012mm)
Quality Inspection
  • Gear tooth profile and helix measurement using coordinate measuring machine (CMM)
  • Hardness testing (Rockwell C scale) and case depth verification

Manufacturers of Gearbox / Reduction Gear

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Frequently Asked Questions

What is the primary function of a gearbox in a hoist?

The gearbox reduces the motor's high-speed, low-torque output to a low-speed, high-torque output suitable for lifting heavy loads. It transmits power from the motor to the drum or lifting mechanism.

How do I select the right reduction ratio?

The reduction ratio depends on the required lifting speed and the motor speed. A higher ratio increases torque but reduces speed. Consult the manufacturer's data for your specific application.

What materials are commonly used in gearbox construction?

Common materials include cast iron for the housing, alloy steel for gears, and bronze for certain components. The specific grades, such as HT250 and 20CrMnTi, are reference values that must be confirmed with the supplier.

What standards apply to gearbox verification?

Relevant standards include ISO 6336 for gear load capacity, AGMA 2001 for service factors, and IEC 60529 for ingress protection. These are references for procurement and verification, not proof of certification.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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