Provided is a protective rear axle housing for an automobile rear drive axle, which solves the problem that gear oil in an inner cavity of an existing automobile rear drive axle is stirred by a high-speed running gear, and the gear oil splashes everywhere due to no protection or insufficient protection. The rear axle housing comprises a rear axle housing upper body, a rear axle housing lower body and half-axle oil baffles, and the half-axle oil baffles are of a flat plate type structure and are symmetrically and fixedly arranged in the rear axle housing lower body left and right; the upper end face of the half-shaft oil baffle is a first flange with a half-shaft arc groove formed in the middle, two side edges matched with the inner wall of the upper portion of the rear axle housing lower body are second flanges, the bottom face matched with the inner wall of the lower portion of the rear axle housing lower body is a third flange, and a backflow hole for gear oil to flow is formed in the middle of the bottom of the third flange. And the second flanges and the third flanges on the left side and the right side of the half-shaft oil baffle plate are sequentially connected through transition edges. The protective rear axle housing is simple in structure, reasonable in design, easy to machine and convenient to install and operate, the manufacturing cost is remarkably reduced, and 90% of gear oil is effectively prevented from being brought out of a rear drive axle inner cavity.

一种汽车后驱动桥用防护型后桥壳，解决了现有汽车后驱动桥内腔齿轮油被高速运转齿轮搅动，无防护或防护不足导致齿轮油四处飞溅的问题。包括后桥壳上、下体以及半轴挡油板，其中半轴挡油板采用平板式结构，左右各一件对称固定布置在后桥壳下体内；半轴挡油板的上端面为中间部位设置有半轴圆弧槽的第一挡边，与后桥壳下体上部内壁相吻合的两侧边为第二挡边，与后桥壳下体下部内壁相吻合的底面为第三挡边，第三挡边底部的中间部位设置有用于齿轮油流动的回流孔；半轴挡油板左右两侧的第二挡边与第三挡边之间采用过渡边相继连接。其结构简单，设计合理，加工容易，安装操作方便，显著降低制造成本，有效防护90%的齿轮油被带出后驱动桥内腔。