Abstract
A lot of parts for transmitting power are built in the inside of the automatic transmission of the automobile. Clutch pack parts having important functions related to speed change adopt machining and heat treatment processes as the main manufacturing method from the viewpoint of high productivity and demanding dimensional accuracy requirement. In the welding and heat treatment process, quality defects such as variation in dimensional accuracy due to thermal deformation of the drum teeth portion occur. In solving this quality problem, we optimized processing conditions by using quality engineering method (Taguchi method), realized quality assurance and low cost by reducing variation in teeth deformation amount.
Highlights
A number of components for transmitting power are incorporated in the automobile automatic transmission (Fig. 1)
More than before, and the variation range of the drum tooth width deformation amount was reduced as compared with the existing machining conditions. (Reduction width : 5.1 μm, rate : 54% reduction)
(2) The process capability was improved by reducing the variation range of the drum tooth width deformation amount. (Cp = 1.79 > 1.33)
Summary
A number of components (clutch disk, seal ring, return spring, piston, inner snap ring, cancel cover, etc.) for transmitting power are incorporated in the automobile automatic transmission (Fig. 1). Clutch pack parts (Fig. 2), which have important functions related to speed change, adopt machining and heat treatment processing steps as the main manufacturing method from the viewpoint of high productivity and demanding dimensional accuracy. By supplying hydraulic pressure to the clutch piston, the disc and the mating plate are pressed, and when they are tightened, power is transmitted. When the hydraulic pressure is released, the piston is pushed back by the return spring, and it becomes released state. That the torque transmitted between the two members can be controlled according to the magnitude of the clutch pressure [8]
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