AGV Drive Wheel with Gearbox: Structure, Key Specs, and Sourcing Guide

The drive wheel with integrated gearbox is one of the most critical mechanical components in a warehouse AGV platform. Unlike a standalone motor or a separate gearbox assembly, this integrated unit combines the planetary reduction stage and the drive wheel into a single bolt-on module — simplifying chassis design, reducing assembly steps, and ensuring consistent alignment between the gearbox output shaft and the wheel hub.

This guide explains what an AGV drive wheel with gearbox is, how it differs from steering drive wheel modules, what specifications matter most, and what to verify when sourcing from a Chinese AGV component manufacturer.

What Is an AGV Drive Wheel with Gearbox?

An AGV drive wheel with gearbox is an integrated drivetrain component that combines a planetary reduction gearbox and a rubber or polyurethane drive wheel into a single assembly. The gearbox reduces the output speed of the drive motor — typically a brushless servo motor — while multiplying output torque to the level required to propel the AGV under full payload.

The term "integrated" distinguishes this product from configurations where the gearbox and drive wheel are sourced and assembled separately. In an integrated unit, the gearbox output flange, wheel hub, and bearing housing are machined and assembled as a matched set by the manufacturer — improving concentricity, reducing vibration, and simplifying the installation interface on the AGV chassis.

This type of drive wheel is a fixed-axis component: it provides drive force in a single direction and does not include a steering mechanism. It is most commonly used as the primary drive wheel in differential drive AGV platforms, where two such units — one on each side of the chassis — provide both propulsion and steering through speed differential control.

Drive Wheel with Gearbox vs. Steering Drive Wheel Module

These two product categories are frequently confused in sourcing inquiries. The distinction is fundamental and affects both the mechanical design and the control architecture of the AGV.

For most standard warehouse AGV and AMR platforms using differential drive, the drive wheel with gearbox is the correct component. Steering drive wheel modules are selected when the AGV requires omnidirectional motion capability or when the platform specifies a single centrally-mounted drive wheel with independent steering control.

Key Components of the Integrated Unit

Understanding what goes into an AGV drive wheel with gearbox helps procurement teams ask the right questions and identify quality differences between suppliers.

Planetary Gearbox

The planetary gearbox is the core of the assembly. It accepts input from the drive motor shaft and delivers reduced-speed, high-torque output to the wheel hub. Single-stage planetary gearboxes are common for moderate reduction ratios of 5:1 to 20:1. Two-stage configurations achieve higher reduction ratios of 20:1 to 100:1 for applications requiring high torque output at low travel speeds. The number of planet gears, gear material (sintered steel vs. hardened alloy), and backlash specification all affect load capacity, service life, and positioning accuracy.

Drive Wheel

The drive wheel is mounted directly on the gearbox output shaft or output flange. Wheel diameter typically ranges from 100mm to 300mm for warehouse AGV applications. Tread material is selected based on floor surface and load requirements: polyurethane treads are the standard choice for smooth concrete warehouse floors, offering a balance of rolling resistance, traction, and floor protection. Solid rubber treads are used in environments with surface variation or where higher shock absorption is needed.

Output Shaft and Bearing Assembly

The output shaft transfers torque from the gearbox to the drive wheel and must be sized to handle the combined radial and axial loads imposed by the vehicle weight and payload. The bearing arrangement — typically a pair of deep-groove ball bearings or tapered roller bearings for higher loads — must be rated for the expected service life under continuous operating conditions. Sealed bearings with grease-filled cavities are standard for maintenance-free operation in warehouse environments.

Mounting Flange and Housing

The gearbox housing and mounting flange define how the unit interfaces with the AGV chassis. Standard mounting configurations include flange-mount (bolted directly to a chassis plate) and foot-mount (bolted through a base plate). Housing material is typically cast aluminum for standard warehouse applications, or cast iron for heavy-duty platforms. Verify that the mounting hole pattern matches your chassis design before committing to a supplier — custom flanges are available but add lead time and tooling cost.

Key Specifications to Evaluate

The following parameters define the performance envelope and integration requirements of an AGV drive wheel with gearbox unit.

Rated Load Capacity

The rated load capacity specifies the maximum vertical force the drive wheel unit can sustain at rated speed without exceeding the design limits of the output shaft bearings. For a differential drive AGV, the load on each drive wheel equals approximately half the total vehicle weight (chassis plus payload) at static equilibrium — though dynamic load distribution during acceleration and cornering can increase this significantly. Always apply a safety factor of at least 1.3 when sizing the unit against maximum expected load.

Gearbox Reduction Ratio

The reduction ratio determines the relationship between motor speed and wheel output speed. A higher reduction ratio delivers more output torque but lower maximum wheel speed. Calculate the required ratio from your target AGV travel speed, drive wheel diameter, and motor rated speed. Confirm that the selected ratio keeps the motor operating near its peak efficiency point during normal travel — not just at maximum load conditions.

Output Torque

Rated output torque is the maximum continuous torque the gearbox output shaft can deliver without exceeding the thermal and mechanical limits of the gear set. For AGV drive applications, the required output torque is determined by the rolling resistance at full payload, the maximum operating gradient, and the desired acceleration rate. Use the calculated figure with a 1.3–1.5 safety factor as your minimum specification when comparing supplier datasheets.

Wheel Diameter

Wheel diameter affects vehicle ground clearance, motor speed requirement, and obstacle-crossing capability. Larger diameter wheels provide better clearance and smoother travel over floor irregularities but increase overall drive unit height and may require a higher gearbox reduction ratio. Smaller diameter wheels result in a more compact assembly but are more sensitive to floor surface quality and joint gaps.

IP Rating

The ingress protection rating defines the unit's resistance to dust and moisture. IP54 is standard for most indoor warehouse environments. Applications in food processing facilities, outdoor logistics areas, or environments with water spray should specify IP65 or higher. Confirm that the IP rating applies to the complete assembly — including the motor-to-gearbox interface — not just the gearbox housing alone.

How to Select the Right Unit

Step 1: Define Payload and Floor Conditions

Start with the full vehicle weight under maximum payload, the floor surface type (smooth concrete, painted floor, expansion joints), and the maximum gradient in the operating area. These parameters set the baseline for torque calculations and wheel tread material selection.

Step 2: Calculate Required Output Torque

Required wheel torque = (vehicle mass + payload) × wheel radius × (rolling resistance coefficient + sin(gradient angle)). For smooth concrete, rolling resistance is typically 0.01–0.02. Add 20–30% to the calculated value to account for acceleration loads and component variation, then use this figure to filter supplier specifications.

Step 3: Match Wheel Diameter and Reduction Ratio to Speed Requirements

From your target AGV travel speed and motor rated speed, calculate the required gearbox reduction ratio: ratio = (motor RPM × wheel circumference) ÷ (60 × target speed in m/s). Select the nearest standard ratio available from your shortlisted suppliers, then verify that the resulting wheel speed at rated motor RPM meets your travel speed requirement.

Step 4: Verify Mounting Interface Compatibility

Confirm that the supplier's standard mounting flange pattern is compatible with your chassis design. Check the overall envelope dimensions — particularly the drive unit height and width — against your chassis clearance constraints. For new platform designs, provide the supplier with your motor interface dimensions to confirm direct compatibility before ordering samples.

What to Verify When Sourcing from a China Factory

China is the dominant global source for AGV drive wheel with gearbox components, with multiple specialized manufacturers offering products across a wide range of specifications and price points. The following checkpoints help identify suppliers capable of meeting industrial quality requirements.

Ask for material certifications for the gear set and output shaft. Hardened alloy steel — such as 20CrMnTi or equivalent — is the standard specification for load-bearing gears in industrial AGV applications. Suppliers using sintered powder metal gears in primary drive applications are typically targeting a lower price point at the cost of load capacity and service life.

Request a test report showing rated torque, efficiency, and noise level at operating temperature. Reputable suppliers maintain production test records for each batch. A noise level above 70dB at rated speed is a flag for poor gear quality or inadequate assembly tolerances in a unit of this class.

Verify that the supplier can provide samples for testing in your AGV platform before committing to volume orders. A minimum qualification run of 5–10 units is standard practice when onboarding a new Chinese component supplier for AGV production.

Confirm lead time for both standard and custom specifications. Standard catalog units are typically available in 2–4 weeks. Custom flanges, non-standard reduction ratios, or custom wheel tread compounds may add 4–6 weeks. Factor this into your platform development and production schedule.

FAQ

What load capacity should I specify for a 500kg payload AGV?

For a 500kg payload AGV with a chassis weight of approximately 150kg, total vehicle weight is around 650kg. Assuming a two-drive-wheel differential configuration with equal load distribution, each drive wheel carries approximately 325kg static load. Applying a 1.3–1.5 safety factor gives a minimum rated load capacity of 420–490kg per unit. A 600kg-rated unit is the standard selection for this application — which is why 600kg-rated drive wheel units are among the most common specifications in warehouse AGV production.

Can I use any brushless servo motor with this gearbox unit?

The motor-to-gearbox interface must match in motor flange dimensions, shaft diameter, and key specification. Most AGV drive wheel gearbox units are designed around standard IEC or NEMA motor flange patterns. Confirm the motor interface specification with your supplier before ordering. Some suppliers offer drive wheel units with the motor pre-installed and tested as a matched assembly — this approach eliminates interface compatibility risk and is recommended for new platform designs.

What is a typical service life for an AGV drive wheel with gearbox unit?

Well-specified units from reputable manufacturers achieve L10 bearing life ratings of 10,000–20,000 hours under rated load conditions. Gear set life depends on material quality and lubrication. Sealed grease-filled units in normal warehouse environments typically require no lubrication service for 5,000–8,000 operating hours. Units operating above their rated load or in contaminated environments will have significantly shorter service lives.

What is the difference between single-stage and two-stage planetary gearbox in this application?

A single-stage planetary gearbox achieves reduction ratios of approximately 3:1 to 10:1 in a compact package. A two-stage unit stacks two planetary stages to achieve ratios of 10:1 to 100:1 or higher. For warehouse AGV applications with typical travel speeds of 1.0–1.5 m/s and standard motor speeds of 2,000–4,000 rpm, reduction ratios of 15:1 to 40:1 are common — often achievable in a single-stage unit depending on wheel diameter. Two-stage units are typically specified for slow-speed, high-torque applications such as heavy-load platforms or incline-capable AGVs.

Is polyurethane or rubber tread better for warehouse floors?

Polyurethane treads are the standard choice for smooth, dry concrete warehouse floors. They offer lower rolling resistance than rubber — improving energy efficiency and battery runtime — and are more resistant to flat-spotting during extended stationary periods. Rubber treads are preferred where the floor surface is slightly uneven, painted, or subject to occasional moisture, as rubber provides higher traction and better conformity to surface variation. Confirm floor surface type and cleanliness requirements before specifying tread material.

Conclusion

The AGV drive wheel with gearbox is a foundational component in warehouse AGV platform design. Getting the specification right — load capacity, reduction ratio, output torque, wheel diameter, and mounting interface — is essential for reliable performance and long service life across the platform's duty cycle.

HKT Robot manufactures integrated AGV drive wheel and gearbox units with load ratings from 200kg to 2,000kg, optimized for warehouse logistics AGV and AMR applications. Standard and custom specifications are available with OEM support for volume production. Contact our engineering team to discuss your project requirements and request samples for platform qualification.