一、概述履带式推土机在循环作业中的工作阻力和作业速度变化很大。目前,推土机大多采用柴油机作动力装置,其扭矩特性刚度过大,因而调速范围和变扭能力较差,不能适应推土机的循环作业工况。为了使推土机在不同工况作业时,能选取适当的牵引力和行驶速度,需在传动系统中设置变速箱。变速箱的功用如下: 1.使推土机的牵引力和行驶速度能在所要求的范围内变化,使之适应经常变化的作 I. Overview Crawler bulldozers vary greatly in their working resistance and working speed during the cycle operation. At present, bulldozers mostly use diesel engines as power devices, and their torque characteristics are too large, so the speed range and the ability to change torque are poor, and they cannot adapt to the cyclic operation conditions of bulldozers. In order to enable the bulldozer to work in different working conditions, it is necessary to select proper traction and driving speed, and a transmission must be installed in the transmission system. The function of the gearbox is as follows: 1. The traction and speed of the bulldozer can be changed within the required range to make it adaptable to frequent changes.