| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a transmission case capable of preventing degradation of sealability of the inside of a transmission case while preventing increase in a weight of the transmission case.SOLUTION: In a transmission case 31, a first side wall portion 33 of which a side wall 26 is deformed in maximum by a load Fc1 in the compressing direction added to a bearing retaining hole 7b when the load Fc1 in the compressing direction is added to a driving load F1 of a counter gear 17 and a final gear 21 by engagement of the counter gear 17 and the final gear 21, is formed into the bag-shape recessed in the orthogonal direction with respect to a joining face 7a, and second side wall portions 34, 35 at both sides in the width direction, of a second side wall portion 33 are formed into the planar shape of approximately in the same plane with the joining face 7a, thus rigidity of the first side wall portion becomes smaller than rigidity of the second side wall portions 34, 35.</p> |
