(EN) The utility model relates to a reduction gearbox for a vehicle. The speed reducer comprises an input shaft, an intermediate shaft, an output shaft, a first-stage reduction gear set, a second-stage reduction gear set, a third-stage reduction gear set, a synchronizer, a main reduction mechanism and a differential mechanism. The primary reduction gear set is arranged on the input shaft and the outputshaft; primary deceleration, the secondary reduction gear set is arranged on the intermediate shaft and the output shaft; secondary deceleration, the three-stage reduction gear set is arranged on theintermediate shaft and the output shaft; wherein the first-stage speed reduction gear set drives the second-stage speed reduction gear set to rotate, the synchronizer is arranged on the output shaftin a sliding mode and selectively connected with the second-stage speed reduction gear set or the third-stage speed reduction gear set, and the output shaft drives the differential mechanism to operate through a main speed reduction mechanism. The reduction gearbox can realize four-stage speed reduction at the first gear, so that the speed ratio is increased.
(ZH) 本实用新型涉及一种车辆用减速箱，包括输入轴、中间轴、输出轴、一级减速齿轮组、二级减速齿轮组、三级减速齿轮组、同步器、主减速机构和差速器，所述一级减速齿轮组设于所述输入轴和所述输出轴上，以实现一级减速，所述二级减速齿轮组设于所述中间轴和所述输出轴上，以实现二级减速，所述三级减速齿轮组设于所述中间轴和所述输出轴上，以实现三级减速，所述一级减速齿轮组驱动所述二级减速齿轮组旋转，所述同步器滑动设于所述输出轴上，并选择性地与所述二级减速齿轮组或所述三级减速齿轮组连接，所述输出轴通过主减速机构驱动所述差速器运行。该减速箱在一挡的时候能够实现四级减速，提高了速比。
