| 摘要 |
<P>PROBLEM TO BE SOLVED: To surely prevent a lip part from turning in when an impeller hub is assembled in an oil seal even if interference is gave to the lip part of the oil seal. <P>SOLUTION: In an automatic transmission having the impeller hub 35 installed on the oil seal 40 from the lip part 52 side of the oil seal of an end part having a cut groove 38 formed thereon, the impeller hub includes a first chamfer part 53 formed on a bottom part outer circumference edge part 38a of the cut groove and having an inclined surface getting smaller in a radial direction as it goes toward the end part of the impeller hub along an axial direction of the impeller hub. In the first chamfer part, axial direction distance from the bottom part outer circumference edge part is made larger as it goes toward a circumference direction center part of the cut groove from both end sides in the circumference direction of the cut groove. <P>COPYRIGHT: (C)2008,JPO&INPIT |
