To provide a cylinder member for an automatic transmission capable of reducing the number of manhours in manufacturing and reducing the size of a press device and achieving high diameter accuracy and a cylinder member manufacturing method that can easily obtain the cylinder member.
A cylinder member 1 for an automatic transmission is formed by press working and includes a bottom part 2, an inner peripheral wall part 3 and an outer peripheral wall part 4. The inner peripheral wall part 3 includes an inner peripheral side stationary part 31 and an inner peripheral side introduction part 32, and the outer peripheral wall part 4 includes an outer peripheral side stationary part 41 and an outer peripheral side introduction part 42. The outer peripheral side stationary part 41 includes a through hole 411 communicating the inner peripheral side with the outer peripheral side. The outer peripheral side introduction part 42 includes a positioning claw part 421 formed by protruding a tip of the outer peripheral side introduction part 42 toward the outer peripheral side. The outer peripheral side introduction part 42 includes: a diameter expanding straight part 422 having a larger constant inner diameter dimension than an inner diameter dimension of the outer peripheral side stationary part 41; and a diameter change part 423 smoothly connecting the diameter expanding straight part 422 to the outer peripheral side stationary part 41.
KAWASHIMA TAKAAKI
JPH0284058U | 1990-06-29 | |||
JPH11141661A | 1999-05-25 | |||
JP2012002263A | 2012-01-05 | |||
JPH09210064A | 1997-08-12 |
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