一种新颖的双齿轮齿条输送机构

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Design of engine piston rod press-fitting moldGAO Liyi(Department of Mechanical Engineering，Guangzhou Vocational Colege ofScience and Technology，Guangzhou 5 1 0550，CHN)Abstract：Severe radial dermation OCCURS in piston assembly.Based on the analysis of internal structure space ofpiston rod assemblies and press-fitting process as wel as forming force，we designed the cantilever Ushaped structure and pneumatic rod element and the reasonable parts were supported in sequence in thetwo periods of piston press-fitting process.Furtherm ore，the steel bal and piston pin were designed asthe integrated locating elements of the piston and the orientation elements of piston pin were also de-signed in this paper.The results showed that the press-fitting mold could guarantee the press-fittingquality of piston rod and meet the requirements of mass production。

Keywords：Piston Rod Assemblies；Press-fitting；Mold Design图 1是公司大批量生产的汽油发动机活塞连杆组件图。产品试制初期，经对压装后的活塞连杆组件检测，发现活塞径向变形很大，圆度误差最大达到0.20mm，严重影响活塞连杆的装配质量。

1 技术分析1.1 活塞的结构分析如图 1示，活塞的整体结构类似于圆筒体，材料为铝合金。工作时在燃烧室内作往复直线运动。为了减蓄塞质量，并在其内腔给连杆小头提供-定的运动空间，活塞被设计成薄壁简件。

1.2 压装过程及工艺力分析由图 1知，活塞销与活塞 a、b两销孔为过盈配合，与连杆孔为问隙配合。压装时活塞销先压人 a孔，再穿过连杆孔，最后压入 b孑L。在产品试制时，压装的全过程都是以活塞 面为支承面；当活塞销压人活塞a的滑动摩擦传递动力，输送过程轻快灵活省力。

(3)由于结构所限大小齿轮支承轴 11较细，试车过程中发现支承轴受力变形；为此增加了两个导向支座 14限制支承轴，从而有效解决支承轴的变形问题。

3 结语该结构合理，轻快灵活，效率高，具有-定的推广价值。