| 摘要 |
PROBLEM TO BE SOLVED: To effectively prevent a film surface vibration while minimizing increase in weight of a case cover of a casing of a transmission.SOLUTION: A first spherical wall 61 which protrudes outward in a dome shape around the center of an axial line L1 of a first axis 13, a second spherical wall 66 which protrudes outward in a dome shape around the center of an axial line L2 of the second axis 14, and a third spherical wall 71 which protrudes outward in a dome shape overlapping a part of the first spherical wall 61 and a part of the second spherical wall 66 are formed in a case cover 54 fastened to an opening of a transmission case 52, so that the three spherical walls 61, 66, 71 are reinforced with each other compared with the case when the first to third spherical walls 61, 66, 71 are independently formed from each other, and the case cover 54 is improved in rigidity. Thereby, the film surface vibration of the case cover 54 can be effectively prevented without the need for any special reinforcement rib, and also the increase in weight of the case cover 54 can be minimized. |
