Technology


Key to the Rotrex supercharger’s unique compactness, efficiency, low noise and reliability is its state of the art traction drive technology.

Great speeds and low noise are just some of the advantages of traction drives over traditional gear transmissions. Traction drives transmit power through friction forces between its rolling elements.

The Rotrex patented traction drive uses an elastic annulus with a small pre-span to secure contact between the roller planets and the sun shaft with a reasonable force. The patented “ramp effect” increases efficiency and reliability in the transmission by regulating the torque transfer capability on demand through self-adjusting planet geometry.

To enhance performance, the Rotrex traction drive uses a special traction fluid. These fluids are a new family of synthetic hydrocarbon oils and greases offering a series of unique performance advantages. Developed specially for its use in Rotrex superchargers, the traction fluid momentarily increases viscosity under high surface pressure, enhancing the traction drive performance by securing the optimum friction between rolling elements while cooling and protecting the system.

This traction drive combined with the latest technology in centrifugal compression, characterized by high adiabatic efficiency and low noise, gives Rotrex superchargers an exceptional competitive edge over any other forced induction solution.

OEM Features

Rotrex superchargers are designed to reflect the 10 year lifetime requirement of an automotive component. A standard range of superchargers is available to match a broad range of applications.

The Rotrex supercharger can be customized for client applications optimizing integration, performance and cost.

Key design features for OEM market applications are:

  • Reliability – rolling elements with patented ramp effect preventing excessive stress.
  • Low NVH – no gears. Planet rollers give silent operation and less vibration.
  • Reduced emissions – no heat inertia impact on exhaust gas reducing catalyst light up time. Application with downsized engines reduces fuel consumption and CO2.
  • Cost – standardized components and a simplified assembly process make it turbocharger competitive.
  • Manufacturing – high volume compatible processes.
  • Packaging – the compact traction drive based supercharger is independent from the engine exhaust simplifying installation and packaging.

Product Concept

Key to the Rotrex supercharger’s unique compactness, efficiency, low noise and reliability is its state of the art traction drive technology.

Great speeds and low noise are just some of the advantages of traction drives over traditional gear transmissions. Traction drives transmit power through friction forces between its rolling elements.

The Rotrex patented traction drive uses an elastic annulus with a small pre-span to secure contact between the roller planets and the sun shaft with a reasonable force. The patented “ramp effect” increases efficiency and reliability in the transmission by regulating the torque transfer capability on demand through self-adjusting planet geometry.

To enhance performance, the Rotrex traction drive uses a special traction fluid. These fluids are a new family of synthetic hydrocarbon oils and greases offering a series of unique performance advantages. Developed specially for its use in Rotrex superchargers, the traction fluid momentarily increases viscosity under high surface pressure, enhancing the traction drive performance by securing the optimum friction between rolling elements while cooling and protecting the system.

This traction drive combined with the latest technology in centrifugal compression, characterized by high adiabatic efficiency and low noise, gives Rotrex superchargers an exceptional competitive edge over any other forced induction solution.

Design

Every Rotrex product, from concept to market, goes through an efficient and strict development process following the highest industrial quality standards. The entire process is led by our highly capable staff in collaboration with clients, suppliers and partners to ensure the highest customer satisfaction. Before final release to the market, every product passes through demanding approval tests, fully monitored and controlled.

The key advantages of the patented traction drive design are:

  • Torque-on-demand
  • Speed up to 330,000 rpm
  • Efficiency up to 98 percent
  • Compactness
  • Reliability
  • Low NVH
  • Cost efficient

Manufacturing

The patented traction technology inside every Rotrex supercharger demands extremely accurate components and assembly. The manufacturing of our superchargers is therefore highly developed, involving efficient quality control and supply chain management.

All components for the Rotrex superchargers are sourced from world class specialist manufacturing companies world wide with full traceability on all part and batch numbers.

The current Rotrex assembly facility has the capacity to manufacture 24,000 units per shift per year and can cost effectively be expanded with additional assembly lines.

For projects in excess of 50,000 units per year the manufacturing process will be outsourced to a major tier one manufacturer.

Technical Data

Rotrex superchargers are the latest in forced induction systems offering high efficiency, compactness, reliability and silent operation. The C range consists of the C8, C15, C30 and C38 families as well as the C8T that includes an additional step-up gear and an electromagnetic clutch.

The unique small size of the C8 makes it the most compact supercharger on the market. The C15, C30 and C38 cover the market all the way up to the large displacement American muscle cars and are also ideal for many other applications.

The Setup and Maintenance Leaflet contains general information on how to choose a supercharger for a particular application and other instructions to help you get the best out of your Rotrex.

Please refer to the Technical Data Sheets for detailed information about the superchargers available within each family.

 

Rotrex C8 Technical Data Sheet

Rotrex C8T Technical Data Sheet

Rotrex C15 Technical Data Sheet

Rotrex C30 Technical Data Sheet

Rotrex C38 Technical Data Sheet

Rotrex C38R Technical Data Sheet

Rotrex Technical Handbook

Rotrex Setup and Maintenance Leaflet

Rotrex Mass Moment of Inertia

Rotrex E-charger Technical Data Sheet

Rotrex VC8 Brochure

Oil Circuit

The Rotrex supercharger has a dedicated traction oil circuit which ensures both lubrication, cooling and actual torque transfer.

Oil is being circulated by the internal oil pump through the traction drive and the external oil circuit. Applied in the generic case, the standard oil set consists of an oil canister, cooler, filter, hoses and fittings.

The oil set comes with one long length of hose making the oil set highly adaptable to the application.

Customized components and accessories are available for distributors and OEM customers on special order. In any case, it is mandatory to use Rotrex approved accessories only.

Placement of oil system

Due to lack of availability Rotrex has had to change the high speed spindle seal in the C8 and C15 families of superchargers from March 2012.

As a result of this new seal the supercharger must now be positioned above the oil system in order to prevent any potential oil leakage from the supercharger. If the oil system is placed too high – thereby allowing the supercharger to fill up with oil – the oil will leak out through the seal and into the compressor housing. For the avoidance of doubt the supercharger is designed to suck oil into the supercharger when running, and it will function perfectly well with the canister and oil cooler positioned below the supercharger.

In addition to being available the new seal has many other benefits including less wear and longer durability. The new requirement for the oil circuit layout has no effect on the functioning of the supercharger when running.

We foresee a similar change in the future for the C30 and C38 families of superchargers, however at this point no decision has been taken. Nevertheless it is always best to position the supercharger above the oil system to avoid any risk of leakage in case of wear or damage to the high speed spindle seal.