A manual transmission case was developed by using a heat-resistant magnesium alloy that achieves a 24% weight reduction over a conventional aluminum alloy case. AE62-Ca was developed by improving the castability of the Mg-Al-Ca-RE-base heat-resistant magnesium alloy ACM522, which had a history of use in oil pans, and this new alloy was applied. At the same time, with the objective of achieving a more reasonable price, a recycling process was developed that resulted in a recycling yield on a par with general magnesium alloys. A formed-in place gasket was developed that provided adhesive strength without chemical treatment and fluorocation resin coating bolts were also developed to prevent galvanic corrosion at the contact surface.
Article of Honda R&D Technical Review Vol.14 No.2 (135 - 142)