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中速柴油机连杆大端可分解为两部分。其分割面多采用锯齿形状。锯齿表面有时会发生微动磨损。连杆的可靠性取决于锯齿的状况。因此,我们用有限元、光弹和载荷试验法,对锯齿进行了研究,并得出了以下结论: 1.连杆大端分割面倾斜角要大于35°,以减小锯齿的应力。2.连杆最佳形状可通过有限元法进行优化结构设计获得。3.锯齿的最佳形状是齿角为91°,且顶部经过卸载处理。4.小锯齿结构有利于均匀接触,但不利于连接螺栓的松弛。而大据齿结构的情况则相反。5.为使啮合锯齿间接触应力均匀,连杆大端用4根螺栓紧固比用两根螺栓好。6.当啮合锯齿间接触应力接近零时,便有发生微动磨损的可能性。7.当锯齿相互分开时,在离齿和啮合齿之间便发生微动磨损。
Medium-speed diesel engine connecting rod can be broken down into two parts. The division of more use of serrated shape. Fretting wear sometimes occurs on serrated surfaces. The reliability of the connecting rod depends on the condition of the sawtooth. Therefore, we use the finite element, photoelastic and load test method to study the sawtooth, and draw the following conclusions: 1 connecting rod big end split plane tilt angle greater than 35 °, in order to reduce the sawtooth stress. 2. The best shape of connecting rod can be obtained through the optimization of structural design by finite element method. 3. The best shape of serration is the tooth angle of 91 °, and the top after unloading. 4. Small serrated structure is conducive to uniform contact, but not conducive to the looseness of the connecting bolts. The case of large gear structure is the opposite. 5. In order to make the intermeshing contact stress between sawtooth even, the big end of the connecting rod is better than the two bolts. 6. When the intermeshing interdental contact stress is near zero, there is the possibility of fretting wear. 7. Fretting wear occurs between teeth and teeth when the teeth are separated from each other.