AGV Drive Wheel Selection Guide for Autonomous Feed Pusher Robots

Feed pusher robots do not work like normal warehouse AGVs.

A warehouse AGV mainly carries goods on a clean and flat floor. A feed pusher robot moves along the feeding area while continuously pushing grass or mixed feed back toward the animals.

It normally moves at a low speed, but it still needs enough pushing force. The floor may also be wet, dusty, uneven, or covered with feed residue.

Because of this, selecting the drive wheels only by robot weight is not enough. The wheel load, output torque, wheel diameter, wheel material, floor condition, and chassis layout should all be reviewed together.

What Makes Feed Pusher Robot Wheels Different?

The drive wheels of a feed pusher robot need to support the robot and produce enough traction to push the feed.

The pushing resistance is not always stable. A thin layer of loose feed is relatively easy to move. A large or compacted pile may require much more force. During operation, the robot may also need to:

Start while already touching the feed
Move steadily at a low speed
Turn in a narrow feeding aisle
Work on damp or dirty concrete floors
Pass small joints, drainage gaps, or thresholds
Run several times throughout the day

This means a suitable drive wheel must provide both enough load capacity and enough usable traction. A wheel with a high load rating may still be unsuitable if its torque is too low or if it slips on the floor.

Differential Drive Wheels or Steering Drive Wheels?

The first step is to choose the basic drive layout.

Most compact feed pusher robots can use either differential drive wheels or steering drive wheels. The right choice depends on the chassis shape, required movement, available space, and budget.

Differential Drive Wheels

A differential drive system normally uses two drive wheels, one on the left and one on the right.

The two wheels are controlled independently. When they rotate at the same speed, the robot moves straight. When they rotate at different speeds, the robot turns. When they rotate in opposite directions, the robot can turn around its own center.

Differential drive wheels are often suitable for:

Round or compact feed pusher robots
Fixed feeding routes
Narrow barn aisles
Robots that need to turn in place
Low-profile chassis
Projects that need a simpler drive structure

This layout is compact and relatively easy to integrate. However, both drive wheels must stay in good contact with the floor. If the chassis is not balanced, one wheel may carry less weight and lose traction.

The drive wheels, caster wheels, battery position, and feed-pushing structure should therefore be considered together.

Steering Drive Wheels

A steering drive wheel combines driving and steering in one unit. It can be useful for:

Larger feed pusher robots
Rectangular chassis
Heavier agricultural robots
More complex travel routes
Robots that move between different barn areas
Applications that need flexible positioning

A steering drive wheel normally needs more installation space than a differential drive wheel. Its control and mechanical structure are also more complex.

For a compact round feed pusher, differential drive is usually the first option to evaluate. For a larger or more flexible agricultural AGV, steering drive wheels may be more suitable.

Why Low-Speed Torque Is Important

Feed pusher robots normally move slowly, but low speed does not mean low power.

The robot must keep moving while the feed pushes back against the front plate, rotating drum, or pushing skirt.

The required wheel torque depends on feed quantity, feed density, pushing structure, robot weight, wheel diameter, floor friction, slope, gear ratio, and gearbox efficiency.

A higher reduction ratio can provide more output torque at the wheel. However, it also reduces the maximum travel speed. The motor, gearbox, and drive wheel should therefore be selected as one complete unit.

Choosing a larger motor without checking the gear ratio and wheel diameter may not solve the problem.

In some cases, too much output torque can simply make the wheel spin on a wet floor. The goal is to provide enough torque without exceeding the available traction.

How Wheel Diameter Affects Feed Pusher AGVs' Performance

Wheel diameter affects torque, speed, chassis height, and obstacle-crossing ability.

Wheel Size	Advantages	Limitations
Larger Wheels	-Better at crossing floor joints, small thresholds, drainage gaps; -Handles uneven concrete and minor height differences; -Smoother movement on rough floors;	-Requires more output torque for same pushing force; -Takes up more chassis space Increases installation height;
Smaller Wheels	-Enables low chassis design; -Fits limited installation space; -Suitable for compact drive units; -Delivers strong ground force from limited torque;	-More affected by gaps, thresholds, and uneven floors; -Less smooth on rough surfaces;

Do not select a wheel only because it fits the chassis drawing. The correct wheel diameter should be selected according to both the required pushing force and the real barn floor. Larger wheels improve obstacle-crossing and smoothness but demand more torque and space. Smaller wheels save space and enable low profiles but are more sensitive to floor irregularities.

Choosing the Wheel Material

The floor in a livestock barn may be wet, dusty, or covered with feed residue. This makes wheel material especially important.

Polyurethane Wheels

Polyurethane is widely used for AGV drive wheels. Its main advantages include good wear resistance, stable load capacity, low rolling resistance, long service life on suitable floors, and relatively low noise.

However, a smooth polyurethane wheel may not provide enough grip on every wet or dirty floor.

The hardness and surface pattern should be selected according to the application.

Rubber Wheels

Rubber wheels provide multiple functional benefits, including better grip on certain wet floors, superior vibration absorption, smoother movement across uneven surfaces, and lower operating noise.

However, rubber may deform more under load and may wear faster in some applications.

The load capacity, service life, and rolling resistance should be checked before selection.

Custom Tread or Wheel Surface

At HKT ROBOT, for special barn conditions, the wheel surface can sometimes be customized.

A tread pattern may improve grip on floors with water or feed residue. However, it may also increase rolling resistance, vibration, or wear.

There is no single wheel material that is suitable for every feed pusher robot. It is helpful to provide floor photos or videos before selecting the wheel material and hardness.

Key Considerations When Selecting AGV Drive Wheels

Selecting AGV drive wheels for a feed pusher robot is not only about checking the total robot weight. The pushing load, chassis design, barn floor, and daily working time can all affect the final choice.

Wheel Load and Weight Distribution

Two robots may have the same total weight but require very different drive wheels. A robot that only travels on a flat floor does not face the same resistance as one that continuously pushes a large pile of feed.

The load on each drive wheel depends on:

Total robot weight
Chassis layout
Battery and motor position
Pushing structure
Number and position of drive wheels
Center of gravity
Required safety factor

The wheel load should not always be calculated by simply dividing the total weight by the number of wheels.

The battery, sensors, pushing plate, and other components can make one side or one axle carry more weight. The pushing force at the front of the robot may also change the load distribution during operation.

Both drive wheels should carry enough and reasonably balanced vertical load. Otherwise, one wheel may lose grip even when the motor provides enough torque.

Traction and Wheel Slip

Wheel slip is a common issue in feed-pushing applications, especially on wet or dirty barn floors.

More motor torque does not always create a more usable pushing force. Once the wheel loses traction, additional torque mainly makes it spin.

Wheel slip may be caused by insufficient weight on the drive wheels, poor chassis weight distribution, unsuitable wheel material or hardness, wet floors or feed residue, excessive output torque, uneven contact between the two drive wheels, a pushing structure that reduces the load on the drive wheels, or one wheel passing over an uneven floor section.

To improve traction, the robot designer may need to adjust the drive-wheel position, battery position, center of gravity, wheel width, tread pattern, or suspension structure.

A more powerful motor cannot compensate for a chassis that does not keep the drive wheels firmly on the floor.

Floor Obstacles and Wheel Layout

Livestock barns may include floor joints, drainage channels, small thresholds, slopes, and height differences between different areas.

Before selecting the wheel diameter, it is important to confirm:

Maximum threshold height
Maximum drainage gap width
Floor-joint width
Maximum slope
Required ground clearance
Caster wheel diameter
Chassis approach angle

Larger drive wheels usually pass small obstacles more easily, but they also need more torque and installation space.

The caster wheels must also be considered. If the drive wheels can cross a drainage gap but the caster wheels cannot, the robot may still become stuck.

The complete wheel layout should therefore be reviewed, not only the powered wheels.

Daily Duty Cycle

Feed pusher robots often operate several times per day. Some only run for a few minutes during each cycle, while others work for longer periods in large barns.

The real duty cycle affects motor and gearbox temperature, bearing life, wheel wear, battery consumption, and maintenance intervals, so customers should provide the running time per cycle, number of cycles per day, average pushing time, maximum continuous operating time, and rest time between cycles.

A drive wheel may perform well during a short prototype test but overheat or wear too quickly during daily operation.

For this reason, the drive wheel should be selected according to the robot’s actual working schedule, not only its maximum load and speed.

Why Choose HKT ROBOT for Feed Pusher Robot Drive Wheels?

HKT ROBOT has focused on AGV and AMR drive systems since 2013. We supply differential drive wheels, steering drive wheels, servo motors, gearboxes, drives, and related motion components for different mobile robot platforms.

For feed pusher robot projects, we do not recommend a wheel based only on its rated load. Our team reviews the robot weight, pushing force, wheel diameter, barn floor, daily duty cycle, and installation layout before suggesting a suitable solution. Standard products are available for faster integration, while wheel material, gear ratio, motor power, and mounting interfaces can also be customized when the application requires it.

With practical experience in agricultural feed-pushing applications, an experienced engineering team, a two-year warranty, and 24-hour technical support, we can support customers from early drive-wheel selection through prototype testing and later production.

If you are developing an autonomous feed pusher robot or another livestock mobile robot, send us your chassis drawing and operating requirements. We’ll help you select the right AGV drive wheels for reliable pushing and stable movement.