Technology
Although the hybrid
vehicle (HV) and electric vehicle (EV) are quieter than the gasoline engine
car, the motor built in these two kinds of vehicles decreases the performance
as it grows hot, not to mention that the motor will become noisier as it grow
big and powerful. A product that absorbs sound and radiates heat for HV and EV
will be in great demand. Tokai Rubber developed a urethane foam with sound absorbency and radiation performance for HV and EV. The company bonded thermally
conducting materials with magnet, and added the resultant product to a urethane
foam. When the final product is put in the mold and foamed in the magnetic
field, the thermally conducting materials align. As a result, heat coming from
the motor will radiate effectively. The balance between sound absorbency and
radiation performance can be adjusted by the additive amount.
The newly developed
urethane has high radiation efficiency and reduces the required amount of
thermally conducting materials. Accordingly, it will be 40% lighter than
silicon rubber to get the same radiation performance, and the production cost
will be halved. Tokai Rubber is producing engine covers made of urethane form,
and it applied the accumulated knowledge and technology to the development of
this new product. It plans to market the new product to automakers and electric
appliance makers as a motor cover. It wishes to put into practical use in 2013.
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