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Rexroth比例阀在使用过程中,应注意对感载比例阀的检查调整.当感载弹簧过松时,后轮制动力就会减小,此时应调整感载弹簧,但不可调得过紧,否则会使后轮制动力太大而失去侧向控制能力,发生甩尾。正确的调整方法是.在平坦的地面上使车身落地,车辆空载,调整感载弹簧,使杠杆与活塞间无间隙即可.在有条件的情况下,可采用精确的调整方法.通过测量前后轮制动管路压力,绘制压力分配特性曲线,确认调整是否合格。
REXROTH力士乐比例阀一般采用两端承压面积不等的差径活塞结构。比例阀不工作时，差径活塞2在弹簧3的作用下处于上极限位置，此时阀门1保持开启，因而在输入控制压力P1与输出压力P2从零同步增长的初始阶段，总是P1等于P2。但是压力P1的作用面积A1为π(D2-d2)/4，压力P2的作用面积A2为πD2/4，因而A2大于A1，故活塞上方液压作用力大于活塞下方液压作用力。在P1、P2同步增长过程中，当活塞上、下两端液压作用之差超过弹簧3的预紧力时，活塞便开始下移。当P1和P2增长到一定值PS时活塞2内腔中的阀座与阀门1接触，进油腔与出油腔即为隔绝，使比例阀进入平衡状态。若进一步提高P1则活塞将回升，阀门再度开启，油液继续流入出油腔而使P2不断升高，但由于A2大于A1，P2尚未增长到新的P1值，活塞又下降到平衡位置。在任一平衡状态下，差径活塞的力的平衡方程为：P2路A2=P1路A1+F(此处F为平衡状态下的弹簧力)。
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