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转向横拉杆上的连接螺纹M30×1.5不仅超连接左、右车轮作用,同时也在调整车轮前束时用。因此,该螺纹的旋合长度一般都超过螺纹标准所规定的中等旋合长度的最大值。由于旋合长度过长,螺纹累积误差过大,使螺纹的作用中径超差,致使外、内螺纹中径发生干涉而不能自由地调整车轮前束,这是转向横拉杆生产过程中常发生的问题。为此,主机厂和专业生产厂均采取降低一级螺纹精度的办法(利用批量生产中尺寸居中的概率理论,扩大螺纹配合副中的平均间隙来补偿螺距累积误差在中径上的当量干涉量)。实际生产证明,这种方法并不能100%保证装配的旋合性。若中径接近“0”偏差时,就没有足够的间隙来补偿螺距误差在中径上的当量,这时仍会发生螺纹连接副干涉而不能调整。只有使中径接近另一极限偏差时(外螺纹为下限偏差、内螺纹为上限偏差),才能得到预期的效果。但是,生产工人没
Steering tie rod connection thread M30 × 1.5 not only super left and right wheel role, but also when adjusting the front beam of the wheel. Therefore, the screw thread length generally exceed the threaded standard maximum length of the medium screwing length. As the screw length is too long, the thread cumulative error is too large, so that the role of the thread diameter in excess of tolerance, resulting in external and internal thread diameter interference and can not be freely adjusted wheel beam, which is often occurred during the production of tie rod problem. To this end, both the OEM and the specialized manufacturer adopt the method of reducing the accuracy of the first-level thread (using the probability theory of middle-size in mass production to enlarge the average clearance in the thread mating pair to compensate the equivalent interference on the pitch of the cumulative pitch error ). The actual production shows that this method does not guarantee 100% spin-on assembly. If the diameter is close to “0” deviation, there is not enough clearance to compensate for the equivalent of the pitch error in the middle diameter, then thread interference may still occur and can not be adjusted. Only when the diameter is close to another limit deviation (external thread is the lower limit deviation, internal thread upper limit deviation), can get the desired effect. However, the production workers did not