Welcome to Thanh Thai Motor Gearbox Warehouse - Vietnam’s No. 1 reputable power transmission equipment distributor. We offer over 295+ diverse models, from ZQ gearboxes specialized for heavy loads and 2-stage gearboxes with high gear ratios, to NMRV, WPA, WPS worm gearboxes.

Commitment: Wholesale prices directly from the warehouse - 12-month warranty - Nationwide delivery. Contact us now at 0909.539.175 to receive the latest updated preferential price list.

1. What is a Gearbox (Speed Reducer)? Why do we need it?

A Gearbox (also known as a Speed Reducer or Industrial Gear Unit) is a vital mechanical device located between the Electric Motor and the driven machinery (such as conveyor belts, lifting winches, or mixers). It acts as the “heart” of industrial transmission systems, ensuring smooth and efficient operation.

Core Functions & Working Principle:

Most electric motors operate at very high speeds (typically 1450 RPM or 2900 RPM). However, industrial machinery often requires lower speeds and higher power. The gearbox solves this by:

• Reducing Rotational Speed (RPM): Slowing down the motor’s output speed to the required level (e.g., from 1450 RPM down to 50 RPM).
• Increasing Torque: According to physics, reducing speed multiplies the torque (pulling force). This is why heavy-duty series like ZQ Gearboxes or 2-Stage Gearboxes can easily handle loads weighing tens of tons.

2. Latest Official Gearbox Price List December 2025

The price of a gearbox (speed reducer) depends on its size, gear ratio, and housing material (cast iron or aluminum). Below is a reference price list for common series at Thanh Thai Motor:

Detailed Price List of Popular Gearbox Models

Note: Prices do not include VAT and shipping costs. For bulk purchases, please call our Hotline for the best commercial discount.

3. Overview of the Most Popular Gearboxes

To choose the right equipment, customers need to understand the characteristics of each type. Thanh Thai Motor classifies its inventory based on construction and practical applications:

Heavy Duty Gearboxes Group

This is the “most robust and durable” group, specifically designed for harsh environments.

• ZQ gearbox (ZQ, JZQ): Uses helical cylindrical gears, with extra-thick cast iron housing. Specialized for cranes, steel rolling mills, and stone crushers.

• Heavy Duty R, K, F, S Gearboxes: European technology gearbox series.
  • Heavy Duty R-Series Inline Helical Gearbox: Installed for agitators, conveyors.

• • Heavy Duty K-Series Helical Bevel Gearboxes and S-Series Helical Worm Gearboxes: High efficiency, energy-saving, right-angle output shaft.

• • F-Series Parallel Shaft Helical Gearbox: Slim design, space-saving.

Worm Gearbox Group (Common)

Their biggest advantages are affordable price and the “self-locking” feature (prevents heavy loads from dropping when power is lost).

• NMRV gearbox: Aluminum housing, lightweight, flexible hollow/solid shaft. Applications: Light conveyors, packaging machines.

• Cast Iron Housing Gearboxes (WPA, WPS, WPO, WPX): Better load capacity than aluminum housing, used for cargo winches, milling machines.

High Ratio Gearboxes Group (2-stage, Cycloidal)

When you need an extremely low output speed (below 20 RPM), conventional 1-stage types cannot meet the demand.

• 2-stage gearbox: Combines two consecutive gear sets. Achieves significant speed reduction without motor overload.

• 3-stage gearbox: Combines three consecutive gear sets. Achieves extremely high gear ratios, suitable for ultra-low output speed requirements and maximum torque.

• Cycloidal gearbox: Utilizes cycloidal discs and pins, excellent shock load resistance, gear ratio can reach up to 1/87 in just 1-stage.

4. Construction and Working Principle

A gearbox is a mechanical power transmission device consisting of multiple components working together to reduce rotational speed while simultaneously increasing torque.

• Gear sets (Gears): The heart of the gearbox. Can be spur, helical, or bevel gears. At Thanh Thai Motor, the gears are carbon-nitrided to achieve HRC 58-62 hardness.
• Shafts: Comprises an input shaft (connecting to the motor) and an output shaft (connecting to the load). C45 steel for torsional resistance.
• Housing: Cast iron or aluminum, with heat dissipation fins.
• Bearings & Seals: Maintain precise shaft alignment and prevent oil leakage.

5. 4 “Golden” Criteria for Choosing a Gearbox

Engineers at Thanh Thai Motor recommend customers clearly define the following 4 parameters to avoid purchasing the wrong gearbox and causing damage:

1. Motor Power: The gearbox must be compatible with the motor power (0.75kW, 1.5kW, 2.2kW…). Note: Installing a small gearbox for a high-power motor will immediately break the gears.
2. Gear Ratio: Formula: Motor Speed (1400 RPM) / Desired Output Speed = Ratio.
3. Mounting Type: Foot-mounted (B3) or Flange-mounted (B5)? Solid shaft or Hollow shaft?
4. Service Factor: If the machine operates 24/7 or experiences shock loads, a safety factor > 1.5 should be chosen.

6. Installation and Maintenance Guide

For a gearbox to last 5-10 years, the installation process is crucial.

• Base/Mounting Feet: Must be securely fixed on a flat, sturdy, vibration-free surface.
• Alignment: The motor shaft and gearbox shaft must be perfectly aligned (if connected via a coupling). Misalignment will quickly destroy the bearings.
• Lubricant/Oil:
  • First time: Change oil after 100-200 hours of run-in period.
  • Regularly: Change after every 2500 hours of operation.
  • Oil type: Use gear oil 90 or 140 (such as Castrol, Shell Omala).

7. Frequently Asked Questions (FAQ)

Gearbox Quotation Video 04/2026 - Thanh Thai Motor