| 主权项 |
1. An automatic transmission including a clutch that can engage rotation transmission of two rotary members by supplying an engagement pressure to an engagement hydraulic oil chamber disposed on an outer peripheral side of a central shaft to press and move a piston member to one axial side, and disengage the rotation transmission of the two rotary members with an other-side pressing mechanism that presses and drives the piston member to the other axial side, wherein
the clutch includes a cylinder member that covers at least an outer peripheral side of the engagement hydraulic oil chamber, forms the engagement hydraulic oil chamber between the piston member and the cylinder member, and has an engagement pressure conducting oil passage formed to run through the cylinder member on the outer peripheral side of the engagement hydraulic oil chamber, an engagement pressure supplying oil passage that can supply the engagement pressure to the engagement hydraulic oil chamber through the engagement pressure conducting oil passage is disposed, and the engagement pressure can be supplied from the outer peripheral side of the engagement hydraulic oil chamber to the engagement hydraulic oil chamber of the clutch. |
