KIRIU CORPORATION Business Report FY2005-2006


New production technology
The Company developed a new technology to mass produce brake rotors that generate no judder at the initial stage when disk brakes are applied when braking the vehicle. Kiriu started development of this new technology by strengthening the rigidity of cutting machines. In doing so, it succeeded in limiting the variance in thickness of the sliding surface of a rotor to less than 10 microns, which is less than half that of conventional rotors. This was achieved through a simple grinding process. Then, by using the same grinding technique developed originally by the Company, the variance was further reduced to less than five microns. When assembled with the latest high-precision hub, the total vibration of all the components can be contained to less than 10 microns. In order to ensure such high precision, it was necessary in the past to grind a rotor after assembling it with the hub and check the alignment of the two parts. The new technology, coupled with enhanced precision in cutting, has thus eliminated this process, giving the Company two advantages, namely high precision and mass-production capabilities. (From an article in the Nikkan Jidosha Shimbun published on jun. 30, 2006)
Information of new products exhibited at JSAE 2006
<Exhibition Highlights>

The Company exhibited brake discs, including FR discs and RR drum discs used for the Estima, the first Toyota model to which the Company has ever supplied products. It presented its design systems devoted exclusively to brake discs, an area in which the Company applied its propriety design system.

Brakes discs on display
Products Maker Model Model Year Location
Front Disc Honda Elysion Exhibited at 2006 JSAE AUTOMOTIVE
Rear Drum Zest
Rear Drum in Disc Subaru Legacy
Front Disc STI S204
Front Disc Suzuki Escudo
Front Disc Toyota Estima
Rear Drum in Disc
Front Disc Mazda RX-8
Front Disc Nissan Fuga
Front Disc March

Accurate Simulation for Brake Disc with Conventional FEA Methodology
-The Company has constructed a propriety disc designing system based on the conventional FEA (Finite element analysis) method that utilizes the expertise achieved by a manufacturer specializing in brake discs for automobiles. By using this proprietary system, the Company was able to complete the design of a standard-type brake disc in two days.
-Precise analysis results can be obtained by having all data that is to be analyzed calculated by the computer program made exclusively for designing brake discs. A high-level of quality in terms of design can be made possible at the initial development stage without the use of complex eigenvalue or non-linear analysis.