前轮前束是指汽车左右两前轮前后端的开档距离之差,即前端开档距离A比后端开档距离略小(如图1所示)即A∠B。它的作用是保证轮胎磨耗均匀且最小,转向轻便容易。当前束不符合规定时,轮胎在运动的过程中就要产生侧向力,迫使轮胎横磨,致使轮胎滚动阻力增加,燃油消耗量增加,同时轮胎也要产生单边磨损。前束不符合规定,除与转向系横直拉杆、转向节、前轴、钢板弹簧等机件技术性能有关外,在调整时有几个问题也值得引起注意。1.前束的测量位置问题前束值的大小,是车辆在设 The front toe-in refers to the difference between the front and rear ends of the front left and right sides of the car, that is, the front-end opening distance A is slightly smaller than the rear-end opening distance (as shown in FIG. 1), that is, A∠B. Its role is to ensure uniform tire wear and minimum, easy to turn light. The current beam does not meet the requirements, the tire in the process of movement will have to produce lateral force, forcing the tire across the mill, resulting in increased tire rolling resistance, fuel consumption increased, while the tire also have unilateral wear and tear. Beam does not comply with the provisions, in addition to the steering system horizontal rod, steering knuckle, front axle, leaf springs and other parts of the mechanical properties, there are several problems in the adjustment is also worthy of attention. 1. Beam measurement location problem The size of the toe-in value is the vehicle is set