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在机修中,我们曾遇到好几起铁牛-55拖拉机后轮轮毂螺栓折断的故障,机手更换了螺栓并尽力上紧,故障不仅没有排除,螺栓反而越断越频繁,甚至发生半轴滚键事故.铁牛-55拖拉机后轮是用轮毂螺栓将后轮轮毂、轮毂盖连接在一起,通过平键固定在半轴上的.动力通过半轴与轮毂的连接传递.当轮毂螺栓稍有松动时,半轴与轮毂、轮毂盖的连接处就会产生相对运动,而引起径向和轴向磨损,形成背弓,造成局部接触(如图所示).这时即使将螺栓拧的再紧,也不可能使轮毂、轮毂盖与半轴紧密结合.由于车轮在行走中的颠簸,在轮毂螺栓处将会产生很大的应力,以致造成上述故障.
In mechanization, we have encountered several Tieshu -55 tractor rear wheel hub bolt breakage failure, the hands replaced the bolts and try to tighten, the failure is not only not ruled out, but the more the bolts break the more frequent, and even half-axis roll Key accident.Tenail -55 tractor rear wheel is a hub bolt to the rear wheel hub, hubcap cover together, through the flat key fixed to the axle.Motor through the axle and hub connection .When the hub bolt is slightly Loose, the half-shaft and the hub, hubcap connections will produce relative movement, causing radial and axial wear, the formation of the back arch, resulting in local contact (as shown) .At this time even if the bolt is screwed Tight, it is impossible to make the hub, the hub cover and the axle close together.Because the wheel in the running bumps, the hub bolt will have a lot of stress, resulting in the above failure.