【正文】 T M P a M P aW??? ? ? 過盈配合處的 k???，由附表 38用插值法求出，并取 ??????，于是得 k???= 0 .8 2 .6 2 4 2 .0 9 9 2k??? ? ? ? 軸按磨削加工，由附圖 34 得表 面質(zhì)量系數(shù)為 ????? = 故得綜合系數(shù)為 111 2 . 6 2 4 1 2 . 7 1 10 . 9 2kK ??????? ? ? ? ? ? ? 111 2 . 0 9 9 2 1 2 . 1 8 60 . 9 2kK ??????? ? ? ? ? ? ? 所以軸在截面 III 右側(cè)的安全系數(shù)為 1 275 6 . 1 5 92 . 7 1 1 1 6 . 4 7 0 . 1 0a a mS K? ??? ? ??? ? ?? ? ? ? 1 155 3 3 6 K? ???? ? ??? ? ?? ? ? ? 2 2 2 2. 6 . 1 5 9 1 2 . 2 3 7 5 . 5 0 1 . 56 . 1 5 9 1 2 . 2 3 7ca SSSSSS?????? ? ? ? ? ??? 故該軸在截面 III 右側(cè)的強(qiáng)度也是足夠的。 截面 III 左側(cè) 抗彎截面系數(shù) 3 3 3 22 d m m m m? ? ? ? 抗扭截面系數(shù) 3 3 3 30. 2 0. 2 22 21 29 .6TW d m m m m? ? ? ? 截面 III 左側(cè)的彎矩 M 為 3 8 6 . 53 4 9 2 0 . 1 9 . 2 8 9 4 7 .38M N m m N m m?? ? ? 截面 III 上的扭矩 T 為 T = .Nmm 截面上的彎曲應(yīng)力 28947 2 7 . 1 91 0 6 4 . 8b M M P a M P aW? ? ? ? 截面上的扭轉(zhuǎn)切應(yīng)力 12 3 9 8 2 3 . 5 1 8 . 7 02 1 2 9 . 6TTT M P aW? ? ? ? 軸的材料為 45 鋼，調(diào)質(zhì)處理。根據(jù)式（ 155）及上表中的數(shù)據(jù)以及軸單向旋轉(zhuǎn)，扭轉(zhuǎn)切應(yīng)力為脈動循環(huán) 變應(yīng)力 ，取 ? =，軸的計(jì)算應(yīng)力 ? ? ? ?222233 4 9 2 0 . 1 9 0 . 6 3 9 8 2 3 . 50 . 1 2 6caMTW ?? ? ? ??? ? MPa= 前已選定軸的材料為 45 鋼，調(diào)質(zhì)處理，由表 151 查得 1[]?? =60MPa。 以上就以初步確定了軸的各段直徑和長度。而VIVIIl? =12mm 。 由圖（ 1）所示的幾何關(guān)系可知 1O 2O /2 gD /2 = aD /2cos（ ? ? ） ? gD = 1O 2O aD cos （ ? ? ） = 51– 57cos40176。以保證吸油 腔流速小于 1~2ms 。 hV = π hD n / 1000 60 其中 hD —— 節(jié)圓直徑 （ mm ） hD =mZ = 3 17= 51mm 帶人數(shù)據(jù)得 hV = 601000 ??? = 601000 ??? = ms 表 12 工業(yè)齒輪油粘度與節(jié)圓極限速度關(guān)系 工業(yè)齒輪油粘度 ? ?2mm s? 12 45 76 152 300 520 760 節(jié)圓極限速度 ? ?maxV m s 5 4 3 2 根據(jù)表格數(shù)據(jù) 油液的粘度 245mm s? ? 此液體允許的齒節(jié)圓極限速度 maxV =4ms hV maxV ， 則校核合格 計(jì)算齒輪各部分尺寸 模數(shù)： m = 3mm 壓力角： α ＝ 20176。模數(shù) m 越大，泵的流量就越大，并且當(dāng)齒輪節(jié)圓直徑一定時(shí)，對流量來講，增大模數(shù)比增加齒數(shù)有利。當(dāng)調(diào)節(jié)軸與其它調(diào)節(jié)控制機(jī)構(gòu)相聯(lián)接以后就可以對泵的輸送流量實(shí)行調(diào)節(jié)或執(zhí)行自動控制。 關(guān)鍵詞 ：齒輪泵 ,液壓泵 ,外嚙合 ,變量 ,流量調(diào)節(jié) II THE DESIGN OF VARIABLE GEAR PUMP (2) ABSTRACT Gear pump structure simple, cost low, selfabsorption ability strong, antifat liquor pollution ability, often serves as the power unit in the hydraulic system, specially applies in the hydraulic system widely. In the variable gear pump has the external gear which a pair meshes mutually, for the axial position external gear, another for may be along the end motion external gear, be possible along the end motion. When the regulating shaft will join later with other regulating control anization to be possible to implement the adjustment or the execution automatic control to the pump transportation current capacity .The variable gear pump is one kind of constant pressure strength variable gear pump, mainly uses in the hydraulic pressure machine variable feed and other liquidity fluid needs the quantitative governing or the variable automatic control pump class product. Because its structure is simple, the flow control is convenient, will make the hydraulic system efficiency to enhance, saves the energy, is suitable in, in the low pressure scope substitutes for in the market the variable vane pump, or makes is suitable in needs the variable supplies each kind of liquidity fluid the specialpurpose variable displacement pump, may replace the quota gear pump in many hydraulic systems, will bee the gear pump in certain domains the update product. KEY WORD: the gear pump, the hydraulic pump, outside meshes, variable, flow control III 目錄 變量齒輪泵的設(shè)計(jì)（ 2） ..................................................... I 摘要 ...................................................................... I THE DESIGN OF VARIABLE GEAR PUMP (2) ..................................... II ABSTRACT ................................................................. II 目錄 .................................................................... III 第 1章 齒輪泵基本參數(shù)的確定 ............................................... 1 確定刀具角 n? 和齒頂高系數(shù) 0f ........................................ 1 選定泵的轉(zhuǎn)速 n ..................................................... 1 確定泵的理論流量 tQ ............................................... 1 選取齒寬系數(shù) k .................................................... 1 選取齒數(shù) Z ........................................................ 1 計(jì)算齒輪模數(shù) m ................................................... 2 確定齒寬 B ....................................................... 2 校驗(yàn)齒輪泵的流量 .................................................. 2 校驗(yàn)齒輪泵節(jié)圓線速度 hV ........................................... 2 計(jì)算齒輪各部分尺寸 ............................................... 3 第 2章 動力參數(shù)的計(jì)算 ..................................................... 5 第 3章 齒輪泵的結(jié)構(gòu)設(shè)計(jì) ................................................... 5 結(jié)構(gòu)形式的確定 .................................................... 5 減輕徑向力的結(jié)構(gòu)措施 ......................................... 5 采用三片式結(jié)構(gòu) ............................................... 6 齒輪與軸做成分離式通過鍵連接 ................................. 6 采用滾動軸承 ................................................. 6 確定高低壓腔尺寸 .................................................. 6 主動軸的計(jì)算 ...................................................... 7 . 初步確定軸 的最小直徑 ........................................ 7 ................................................. 7 軸上零件的周向定位 ........................................... 8 確定軸上圓角和倒角尺寸 ....................................... 9 求作用在齒輪上的力 ........................................... 9 求軸上的載荷 ................................................. 9 IV 按彎扭合成應(yīng)力校核軸的強(qiáng)度 .................................. 11 精確校核軸的疲勞強(qiáng)度 ........................................ 11 從動軸的計(jì)算 .....................