Carbon fibre motorcycle parts have taken a step closer to mass production with BMW Motorrad winning a JEC Innovation Award for the development and manufacture of a carbon fibre swingarm for its 2017 HP4 RACE.
The swingarm was made in a cost-effective mass-production technique using welding robots. The process is expected to lead to more lightweight carbon fibre products in future motorcycles.
In fact, the entire main frame of the HP4 RACE is made of carbon fibre reinforced plastic produced by the RTM process.
Carbon fibre and other lightweight materials are becoming more prevalent in motorcycle design with a wide range of benefits to handling, braking, acceleration, fuel economy and emissions.
The properties of carbon fibre that make it so attractive to motorcycle manufacturers is its light weight and high strength.
He says they developed a technology that allows precise configuration of component properties by using a variety of composite and metal inserts.
“This scalability means that a single tool can be used to produce a wide range of different components at cycle times of less than a minute,” he says.
“The maximum strength can be adjusted by means of additional CFP panels which can be thermoplastically joined.”
BMW also used welding robots in the process to reduce costs.
The HP4 RACE carbon fibre project will form the basis for the use of carbon fibre in serial production of BMW motorcycles and automobiles.
Carbon technology explained
BMW project manager Elmar Jäger explains the technology:
We opted for chassis components under continuous load since the requirements involved are especially demanding. While car chassis parts are concealed, the visible motorcycle rear swinging arm was ideal for our project since the forces at work are immediately evident. Our production technique uses CFP in the form of high-strength endless fibres where this is required by the stress pattern, while an injection mould part with short CFP recycling fibres is used where the stress levels are not as high. In this way, we developed a cost-efficient design that can be scaled according to requirements by inserting endless fibres with varying levels of strength in the same tool.