【正文】 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design of the gear mechanismAbstractThe gear transmission is most widely used in mechanical transmission with large carrying capacity，high efficiency，precise gear ratio，pact structure，reliable operation and long life．However，the gear transmission design process needs a large number of plex charts and calculations，which causes great difficulty for designers．This article fits the charts and statics in the process of design to make them programmed，and then uses VB language to input the data that needed directly into the puter system ，which provides several schemes to be selected for designers．Finally，connection of VB and CATIA is realized and user interface of choosing kind of gear and inputting parameter are developed. By final program parameter table of CATIA is controlled. Base on interface input parameter and model regeneration, promptly design of gear parts is realized.Keywords: VB。在這種情況下，參數(shù)化設(shè)計方法應(yīng)運而生。提高齒輪的設(shè)計質(zhì)量和效率已經(jīng)成為提高機械產(chǎn)品的效率和關(guān)鍵。在齒輪的設(shè)計中，計算一個齒輪的各幾何尺寸時，直接用公式就可以計算出結(jié)果，但是當我們要計算多個甚至更多個齒輪的幾何尺寸時，就變得十分繁瑣，這里使用VB編寫了一個程序，解決了這一問題。，包括計算、繪圖和使用設(shè)計數(shù)據(jù)、手冊、標準和規(guī)范等能力。兩種折斷均起始于輪齒受拉應(yīng)力的一側(cè)，如圖21所示。 輪齒嚙合時，由于相對滑動，特別是外界硬質(zhì)微粒進入嚙合工作面之間時，會導(dǎo)致輪齒表面磨損。在一定條件下，由于上述第2種失效形式是主要的。即齒面要硬，齒芯要韌，并具有良好的加工性和熱處理性。對于高速、重載或重要的齒輪傳動，可采用硬齒面齒輪組合，齒面硬度可大致相同。如機床操縱機構(gòu)的齒輪HT300187~255 齒輪傳動精度簡介一、精度等級漸開線圓柱齒輪標準（GB/T10095—88）中，規(guī)定了12個精度等級，第1級精度最高，第12級最低。合適的側(cè)隙可通過適當?shù)凝X厚極限偏差和中心距極根偏差來保證，齒輪副的實際中心距越大、齒厚越小，則側(cè)隙越大。同理，F(xiàn)r1=Fr2，其方向指向各