ZF公司推出用于小型轿车和电动汽车的新型动力转向装置,该装置有一个中间闭式转向阀。 与通常动力转向系统相比,其最大的优点是能量需求极低。常用装置由于转向间的中间位置是常开的,因而需要不断循环的液流;而新型转阀问其中心位置是常闭的,因此在车辆直线行驶或以恒定转向角 ZF introduced a new power steering for small cars and electric vehicles that has a mid-range steering valve. Compared with the usual power steering system, its biggest advantage is the extremely low energy requirement. Common device due to the middle of the steering is normally open, which requires continuous circulation of fluid; and the new rotary valve to ask its central position is normally closed, so the vehicle traveling straight or at a constant steering angle