重型载货汽车车型的驱动式采用4X2、6X4、6X6.驱动后桥是中央一级减速再加轮边行星齿轮减速的常规式驱动桥。按照不同的使用条件又分普通型和加强型两种，它们的结构和其它所有零部件都相同，只是桥壳壁厚不同。普通型桥壳壁厚为16mm,加强型桥壳壁厚为20mm.一般加强型桥壳常用在非公路用工程车型上使用。在驱动后桥的左半轴和差速器啮合套支承在左半轴花键轴上。当汽车行驶在泥路面而某一单边车轮打滑空转时，操纵差速锁开关，通过电磁阀使压缩空气通向差速锁工作缸，工作缸活塞推杆将通过拨叉使啮合套与啮合套啮合，从而使半轴与差速器壳成为一体，换句话说使左、右半轴成为一体，使汽车能平稳地驶出泥泞路面。驱动后桥采用轮边行星减速机构，用以提高速比，减小中央主减速器的尺寸，从而加大底盘的离地间隙，提高了汽车的通用性。动力由传动轴传递给驱动法兰1再传递给主动齿轮轴5，再经过被动齿轮20，传递给差速器。

The drive type of heavy truck vehicle model driven by 4X2, 6X4 and 6X6. is the conventional drive bridge with the central level deceleration and the planetary gear deceleration on the side. According to the different use conditions, it is divided into two kinds of common type and strengthening type. Their structure and all the other parts are the same, but the wall thickness of the bridge shell is different. The wall thickness of the ordinary bridge shell is 16mm, and the reinforced bridge shell wall thickness is 20mm. general reinforced bridge shell commonly used in non highway engineering models. The left half shaft and the differential meshing sleeve are supported on the left half axis of the spline shaft on the rear axle. When the car driving on the dirt road surface and a single wheel slip while idling control differential lock switch, the electromagnetic valve makes the compressed air to the differential lock cylinder, cylinder piston rod through the shift fork to the engaging sleeve and the engaging sleeve engages so that the axle body and a differential case, in other words left and right half shaft integrally, the automobile can smoothly out of the muddy road. The rear axle is driven by a planetary gear reducer, which is used to increase the speed ratio and reduce the size of the central main reducer, thus increasing the clearance of the chassis and improving the versatility of the vehicle. The power transfer from the drive shaft to the drive flange 1 is transferred to the drive gear shaft 5, and then passes through the passive gear 20 to the differential.