Strength in Motion: Geared Motors for Vehicle Access

Vehicle access systems are critical for people with mobility issues to gain their independence, but their safety and reliability must be guaranteed. When designing products within these spaces, the challenge lies not only in creating smooth, intuitive user experiences, but in specifying components that can withstand repeated use, heavy loads, and demanding environments.

At the heart of these systems are geared motors which at Parvalux are engineered to provide controlled torque, precise motion, and long-term durability across a full range of vehicle access applications which include wheelchair lifts, step actuators, and car boot hoists.

The team of engineers at Parvalux have decades of experience in manufacturing geared motors which combine technical expertise with application-specific motor design.

Vehicle Access Expectations

Across the Vehicle Access industry, there are several expectations which are applicable for wheelchair lifts, step actuators, and boot hoists. All three applications require:

High torque at low speed – As all these applications involve lifting or manoeuvring under load, they need to be able to overcome static friction and load inertia through a high starting torque.

Controlled, predictable motion – There should be controlled acceleration and deceleration, with no jerky start/stop motions alongside maintaining a consistent speed regardless of the load.

High shock and load tolerance – The real-world environments these applications will be expected to work in will include road vibrations, kerbs and other uneven surfaces, as well as variable weight distribution. Therefore, the geared motor must be able to handle this unpredictability as well as maintaining smooth operation with repeated start/stop cycles and unpredictable shock loads.

Compact size envelope and integration flexibility – The housing for the geared motor needs to be compact as it is often positioned in underfloor or side-entry housing. As well as being small the geared motors should have flexible mounting options, customisable shaft outputs, and adaptable electrical components to ensure easy integration.

Environmental protection – As these applications are exposed to water spray, road salt and dust as well as variations in temperature it is important they have the appropriate IP rating and are manufactured with corrosion-resistant materials.

Low noise – Smooth running and low noise go hand in hand, as noise and vibrations can severely affect the user experience and their perception of device safety.

Customisation capability – Even if the general requirements are similar, load capacities and mechanical architecture can vary from application to application. Therefore, the possibility of customisation in regard to variable gear ratios, different voltages, and custom shafts and housings can make your solution far more efficient than an off-the-shelf option.

In all vehicle access systems, the selection of the right geared motor is fundamental for all the expected reasons: safety compliance, user experience, system longevity, reduced warranty claims, and brand reputation.

Specific Applications

Wheelchair Lifts

Modern wheelchair lifts must operate safely and consistently under high load conditions, often multiple times per day with no change in output. Whether installed in private vehicles, taxis or community transport, these systems demand:

• High starting torque
• Smooth acceleration and deceleration
• Compact installation footprint
• Fail-safe braking and control
• Long operational life under cyclic loading

Wheelchair lifts therefore rely on robust drive systems to raise and lower platforms securely in all weather conditions and across varied duty cycles.

Step Actuators

Powered access steps are a critical feature in accessible taxis and specialist transport vehicles. These mechanisms must be able to deploy and retract reliably, in potentially harsh roadside environments which are exposed to dirt, water ingress and temperature fluctuations. Therefore, step actuators must be able to provide:

• Compact motor solutions
• High shock resistance
• Controlled speed under load
• IP-rated protection
• Long maintenance intervals

Specialist step applications depend on robust actuation systems to ensure passenger safety and end user comfort, as well as regulatory compliance.

Car Boot Hoists

Car boot hoists provide safe and convenient lifting of mobility scooters and wheelchairs into vehicle luggage compartments. These systems, therefore, must balance lifting capability with compact storage and user-friendly operation often in challenging environments. These boot hoists can be vital to a person’s independence as they enable drivers and passengers to transport equipment independently. To enhance the end user experience, these solutions require:

• Reliable lifting torque

• Smooth, controllable motion
• Compact and lightweight motor assemblies
• High safety margins
• Long service life with minimal maintenance

The Parvalux Range

Parvalux’s PM3-M Box paired with the GB66 gearbox is an ideal solution for wheelchair lifts and offers:

• High torque density in a compact form
• Robust gearbox for heavy-duty lifting
• Optimised gear ratios for smooth platform movement
• Customisation options to meet integration needs

The PM3-M/GB66 combination is engineered to handle the mechanical demands of vertical lifting whilst at the same time maintaining quiet, controlled operation.

For step actuator applications, the RE38 motor with the GB56 gearbox provides:

• High efficiency performance in a compact space
• Strong output torque for step deployment
• Adaptable mounting configurations
• Proven durability in repetitive actuation cycles

The RE38-GB56 configuration is well-suited to applications like step actuators, where consistent deployment speed and mechanical resilience are essential. The modular design also means it is easy to integrate into constrained packaging spaces without compromising performance.

The PM5-MWS motor platform is engineered to support hoist-style lifting mechanisms, and offers:

• High torque capability in a compact package
• Durable gearbox options for lifting loads
• Configurable voltage and speed options
• Robust design for automotive environments

The PM5-MWS is an ideal choice for car boot hoist applications where controlled lifting and lowering of mobility equipment is essential. Its adaptability means it allows the designer to specify performance parameters aligned precisely with their mechanical architecture.

Partnering with Parvalux

Partnering with Parvalux at the beginning of the design process, means many of the challenges presented by this industry can be eliminated early. Our experienced team of engineers works closely with our clients to ensure the initial specification is as detailed as possible, helping to identify torque calculations, duty cycle validation, and environmental protection considerations. We are then able to tailor shaft configurations, mounting interfaces, and electrical characteristics to ensure a seamless system integration of the final product.

Our decades of experience have taught us that under-specification can risk premature failure and inconsistent performance whereas over-specification increases cost and packaging constraints. Therefore, we have found the optimal solution lies in engineering alignment between motor characteristics and real-world application demands.

So, if you are working on a vehicle access project and would like some advice on the most appropriate geared motor components speak to a member of the Parvalux team today.