Our Rack and Pinion boot with an aspirator, specifically designed for HPS systems where air circulation occurs outside the rack.

Boot with Aspirator

Allows air to come in, but keep water and debris out, solving the issue of snaking
An innovative design process ensures quick design of boots that are the perfect fit
Our design reduces weight for a more compact fit, better recycling and cheaper, more cost-efficient production

Rack & Pinion Boot with Aspirator

When hydraulic power steering (HPS) systems route air externally rather than through an internal hollow in the rack, the sealing solution needs to do more than protect against dirt and debris. It must also manage airflow between both boots of the steering system. Trelleborg's rack and pinion boots with aspirator are engineered precisely for this requirement, connecting both sides of the system and balancing internal pressure without the need to drill the rack.

Key benefits

Three rack and pinion boots displayed side by side, with the center boot featuring a standard rack and pinion design with an aspirator attachment.

As part of visual quality control, two operators inspect newly produced rack and pinion boots on a rack, ensuring consistent quality and compliance with automotive industry standards.

How the aspirator works

The aspirator is a tube welded onto a non-functional area of the boot using a dedicated robotic process. This placement is deliberate: it keeps the boot's geometry intact, so steering behavior remains unchanged when the vehicle is in use. Once fitted, the aspirator links both boots externally. Air moves from one side to the other through the tube, distributing pressure evenly across the system. This replaces the internal hollow found in other HPS rack designs, offering a practical and cost-effective alternative where no internal channel is available.

Product variants

The boot with aspirator is available in two configurations.

A focus on the Trelleborg's rack and pinion boots with aspirator, engineered to manage airflow between both boots and steering system.

Standard with aspirator

This configuration suits HPS systems where air must circulate externally. The aspirator manages airflow between both boots while the boot itself protects the steering gear in a compact, lightweight format suited to demanding environments.

A rack and pinion boots with an aspirator.

Anti-snaking Rack & Pinion boots

When HPS systems operate under high pressure, snaking becomes a real risk. The bending it causes can puncture the boot and, in the worst case, lead to a loss of steering. Trelleborg's anti-snaking boot with aspirator addresses this directly: it lets the full system breathe, reducing internal temperatures and lowering pressure across both sides. This cuts deformation risk and resolves snaking, providing complete steering protection at temperatures up to 150 °C.

Engineered to your specifications

Our Technical Centres combine advanced robotics, integrated manufacturing and local engineering expertise to deliver aspirator boot solutions built to your exact specifications

An employee recording data in front of an operating bench test machine.

A technology developed and tested by our technical centre

Welding the aspirator accurately and reliably is what makes this product work. The Trelleborg Boots Technical Centre uses unique robotics developed specifically for this process, ensuring the aspirator is positioned and bonded to the exact specification every time. This capability sits alongside our broader thermoplastic boot production, giving you access to a fully integrated design and manufacturing service. With our global capabilities and local presence, you can develop a solution tailored to your HPS system.

Ready to design your boot with aspirator?
Tell us about your HPS system and we will help you define the right configuration. Whether you need standard or anti-snaking protection, our engineers will design an aspirator boot that balances pressure, protects the steering gear and reduces cost across your system.