外嚙合齒輪泵的組成:前、后泵蓋，泵體，一對齒數(shù)、模數(shù)、齒形完全相同的漸開線外嚙合。 工作原理： 密封容積形成—齒輪、泵體內(nèi)表面、前后泵蓋圍成齒輪退出嚙合,容積↑吸油 容積變化↓壓油 吸壓油口隔開—兩齒輪嚙合線及泵蓋外嚙合齒輪泵的流量計算 由于齒輪嚙合時，嚙合點的位置瞬時變化，其工作體積變化率不同，因此瞬時流量不均勻，即脈動。在計算瞬時流量時，必須準確計算積分，這很麻煩。近似計算法常用。 排量計算 假設(shè)：齒槽容積=輪齒體積 即相當于有效齒高和齒寬所構(gòu)成的平面所掃過的環(huán)形體積，則V=πdhb=2πzm2b。 實際上，由于齒槽體積>輪齒體積，所以取出V=6.66zm2b流量計算 結(jié)論： 1齒輪泵的qt是齒輪幾何參數(shù)和轉(zhuǎn)速的函數(shù) 2∵轉(zhuǎn)速等于常數(shù)，流量等于常數(shù) ∴定量泵 3理論流量與出口壓力無關(guān)瞬時流量 由于每對輪齒嚙合時嚙合點位置的變化會導(dǎo)致瞬時流量變化，因此會出現(xiàn)流量脈動 流動脈動結(jié)果：引起系統(tǒng)壓力脈動，產(chǎn)生振動和噪聲，影響傳動穩(wěn)定性。 外嚙合齒輪泵結(jié)構(gòu)要點： 困油及其消除措施 徑向作用力不平衡 泄漏困油現(xiàn)象產(chǎn)生原因： 由于為保證齒輪連續(xù)平穩(wěn)運轉(zhuǎn)，又能夠使吸壓油口隔開，齒輪嚙合時的重合度必須大于1，所以有時會出現(xiàn)兩對輪齒同時嚙合的情況，故在齒向嚙合線間形成一個封閉容積 困油引起的結(jié)果： a→b容積縮小p↑高壓油從一切可能泄漏的縫隙強行擠出，使軸和軸承受很大沖擊載荷，泵劇烈振動，同時無功損耗增大，油液發(fā)熱。b→c容積增大p↓形成局部真空，產(chǎn)生氣穴，引起振動、噪聲、汽蝕等 總之：由于困油現(xiàn)象，使泵工作性能不穩(wěn)定，產(chǎn)生振動、噪聲等，直接影響泵的工作壽命。 消除困油的方法 原則：a→b密封容積減小，使之通壓油口，b→c密封容積增大，使之通吸油口，b密封容積最小，隔開吸壓油方法：在泵蓋（或軸承座）上開卸荷槽以消除困油，CB-B形泵將卸荷槽整個向吸油腔側(cè)平移一段距離，效果更好 90-L-055-MA-1-NN-60-S-3-S1-C-05-GBA-32-32-24 90L055MA1NN60S3S1C05GBA323224 90-L-055-MA-1-NN-60-S-3-S1-D-03-GBA-32-32-24 90L055MA1NN60S3S1D03GBA323224 90-L-055-MA-1-NN-60-S-3-S1-D-03-GBA-35-35-24 90L055MA1NN60S3S1D03GBA353524 90-L-055-MA-1-NN-60-S-4-S1-C-03-GBA-35-35-24 90L055MA1NN60S4S1C03GBA353524 90-L-055-MA-1-NN-61-P-4-S1-C-03-GBA-23-23-24 90L055MA1NN61P4S1C03GBA232324 90-L-055-MA-1-NN-61-R-3-C6-D-05-GBA-32-32-24 90L055MA1NN61R3C6D05GBA323224 90-L-055-MA-1-NN-61-R-3-T1-C-03-GBA-35-35-24 90L055MA1NN61R3T1C03GBA353524 90-L-055-MA-1-NN-61-S-3-S1-C-03-GBA-35-35-24 90L055MA1NN61S3S1C03GBA353524 90-L-055-MA-1-NN-80-L-3-C6-C-09-GBA-45-45-20 90L055MA1NN80L3C6C09GBA454520 90-L-055-MA-1-NN-80-P-3-C6-B-09-GBA-45-45-24 90L055MA1NN80P3C6B09GBA454524 90-L-055-MA-1-NN-80-P-3-S1-C-03-GBA-38-38-24 90L055MA1NN80P3S1C03GBA383824 90-L-055-MA-1-NN-80-P-3-S1-C-03-GBA-42-42-24 90L055MA1NN80P3S1C03GBA424224 90-L-055-MA-1-NN-80-P-3-S1-D-03-GBA-38-38-24 90L055MA1NN80P3S1D03GBA383824 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