裝配圖動力輸出總成的設計（720轉-分）（有cad圖+文獻翻譯）

裝配圖動力輸出總成的設計（720轉-分）（有cad圖+文獻翻譯）,裝配,動力,輸出,總成,設計,cad,文獻,翻譯 動力輸出總成的設計（720轉/分） 摘 要 動力輸出軸是拖拉機的重要工作部件,動力輸出主要用于拖拉機在行進中輸出發(fā)動機動力以驅動農(nóng)機具,如割草機、噴藥機等。動力輸出總成的設計是基于減速增扭的原理。動力從變速箱引出，再進過一對大小齒輪減速，轉速減小的同時，扭矩成比例的增加。動力輸出沒有標準的設計過程，主要根據(jù)變速器和減速器的設計，確定齒輪的傳動類型、傳動關系、受力分析、建立數(shù)學模型。依據(jù)傳統(tǒng)的設計方法，本著半經(jīng)驗半理論的設計原則通過類比的方法，參考已有車型的動力輸出的設計過程，然后驗算零件的強度和機械應力情況，最后確定了采用半獨立式的動力輸出機構方案，動力直接從發(fā)動機的曲軸引出，這種輸出類型現(xiàn)在被廣泛使用，特別受到歐美的青睞。本次設計采用的主動的直齒滑動齒輪嚙合，主動齒輪可以在高速軸上滑動，以提供嚙合和分離的選擇。這種設計最大的優(yōu)點是結構簡單，便于安裝和維修。 而且為了避免動力輸出軸頭在高速旋轉下危及人身的事故發(fā)生，本次設計專門設計了動力輸出軸保護罩，保證外露的高速旋轉部件不會傷害人，提高了使用的安全性。 關鍵詞：動力輸出軸，半獨立式，主動齒輪，從動齒輪 POWER TAKEOFF SHAFT DESIGN（720r/min） ABSTRACT Power take off shaft is an important part of the tractor, PTO shaft provides a means to drive the machines that are being towed by the tractor, Take mower and manure spreaders for example. The PTO shaft operates on the principle of reducing the PTO shaft speed, before the drive from the transmission is applied. At the same time ,the PTO shaft increases the torque ,for when speed is lost through gears, torque is gained in the same proportion . According to the design of the transmissions in consideration of the simplicity and reliability. According to the traditional mean of design, part experience and theory and analogism. We firstly chose gear type, make selection of the gear parameter, then establish the mathematic model dose the type of the being. In this thesis, we dose semi-independent type. This type of PTO shaft is popular not only in our country, but also in Europe. The merit of this type is outstanding, We choose spur gear to transmit the drive.the driving gear can be slid along the splines on the internal end of shaft and into mesh with driven gear. The means of this type is easy for fixing and mending. To avoid the accident of the wound from the revolving of the end of PTO shaft, the shaft and universal joint of PTO should be guarded by commercially available shields ,which cover moving part, so it will improve the softy. Key words：PTO shaft, semi-independent, driving gear, driven gear 目 錄 第一章 緒論........ .. .. .. .. .. ........................1 §1.1拖拉機發(fā)展概述............................1 §1.2動力輸出總成的概述............................3 §1.3拖拉機工作速度匹配...........................5 §1.4 動力輸出軸的轉速配置...........................5 §1.5動力輸出軸性能...........................6 第二章 動力輸出總成齒輪主要參數(shù)的確定... .. .. .. .. .....8 §2.1 齒輪的概述.... .. .. .. .. .......................8 §2.2 方案一設計.. .. ................................8 §2.2.1 方案一齒輪計算 . ................... ......8 §2.2.2 方案一軸設計......................... .....9 §2.3 方案二設計.. ............... .. ...............12 §2.3.1 方案二齒輪設計...................... ......12 §2.3.2 齒輪變位設計...................... ........ 15 §2.3.3 齒輪重合度的設計...................... ....17 第三章 動力輸出總成軸承的計算......................19 §3.1 軸承的概述.. .. .. .. ...........................19 §3.2 軸承的計算.................................19 第四章 軸的校核計算................................21 §4.1 高速軸設計.... .. .. .. .........................21 §4.2 低速軸設計.... .. ..............................23 第五章 花鍵的計算...................................26 §5.1 低速軸花鍵設計. ... ............................26 §5.2 高速軸花鍵設計.................................27 §5.3 連軸器花鍵設計........................ ........ 28 第六章 控制機構設計.................................30 §6.1 自鎖彈簧的設計.... .. .........................30 §6.2 操縱機構位置的設計.............................31 第七章 動力輸出軸的加工方法.......................34 第八章 使用與保養(yǎng)......................35 第九章 結論.........................................37 參考文獻...............................................38 致謝...................................................40 IV