4R44E、5R55E箱壁移动和卷土重来

我听到过一些抱怨，由于福特汽车的交叉泄漏，阀体垫圈爆裂，阀体螺栓松动，以及其他各种无法解释的症状4R44E型通过5R55E型单位。这些问题通常伴随着阀体垫圈上的奇怪磨损模式或“起毛”以及隔板上的见证标记（参见图1).

原因是润滑油孔虫墙, which are susceptible to side-to-side movement due to large surface area and few reinforcements. The longest passage is line pressure, which varies from 70 – 350 psi. The adjacent long passage that runs parallel is “CC” converter oil, where pressure is limited to about 80 psi by the vertical blow-off valve/spring in the CC passage near the front of the valve body. The large surface area and pressure difference between these long passages is the major cause of case wall movement. For example, just part of one section of the worm-track wall is roughly 1 1/4 x 5”, which works out to a surface area larger than most servos. Calculating the pressure differences between these two oil circuits shows the forces pushing on the case wall can be over 1,000 pounds in drive and more than 1,500 pounds in reverse.

同样重要的是，这些力会随着节气门位置、负载或档位范围的变化而瞬间改变，从而导致壳体壁的快速前后移动。随着时间的推移，阀体垫片的不断移动会逐渐磨损，通常会导致该区域的阀体螺栓松动。螺栓松动最终会导致垫圈爆裂或电路交叉泄漏。这似乎是一个地方，铸造可以加强，但从来没有发生在生产。

解决这个问题的方法出奇地简单和便宜。插入普通固定螺钉（参见图2)侧向进入壳体使壳体壁更加稳定，对油流没有明显限制。参考图3通过5安装固定螺钉的步骤。只有一对夫妇会起到桥梁的作用，并取得很大的进步。您可以根据需要添加其他螺钉，但要谨慎选择合适的间隙尺寸，以免墙开裂。我承认，这种方法有点奇怪，但一旦你尝试，我相信你会看到它是多么简单和有效。