| 摘要 |
<p>PURPOSE:To prevent the seat from plastic deformation and easily fix a spring by fixing a return spring by applying the burring work onto the starting-up part of a rib formed on the outer peripheral edge of a return spring seat and forming an annular stepped hole on the rib. CONSTITUTION:The hydraulic servo device 83 of an automatic transmission is equipped with at least a return spring 84 which presses an annular piston 82 which slides, fitted by a hydraulic servodrum 81, to the clutch release direction and a return spring seat 176 which fixes one edge of the return spring 84 and is fixed on the hydraulic servodrum 81 and urged toward the annular piston. In this case, a rib 191 is formed on the outer peripheral edge of the seat 176, and an opened port 196 is formed at the center part, and a hole 192 for burring work and a starting-up part 193 are formed on the rib 191. The return spring is fixed by applying burring work onto the starting-up part 193, and a stepped part 195 is formed on the hole 192.</p> |
