德国rexroth力士乐轴向柱塞泵工作原理-REXROTH力士乐控制阀力士乐泵德国力士乐

柱塞泵原理

　　一、径向柱塞泵特征：各柱塞排列在传动轴半径方向，即柱塞中心线垂直于传动轴中心线 1. 径向柱塞泵的工作原理结构：定子、转子、柱塞、配油轴等 ↓ ↓ 偏心固定工作原理：V密形成——同上上半周，吸油 V密变化——转子顺转〈下半周，压油排量 V = πd22ez/4 2）流量 qt = Vn =πd22ezn/4 q = Vnηpv =πd22eznηpv/4 变量原理：径向柱塞泵的排量和流量改变偏心距的大小和方向，即可以改变输出油液的大小和方向。阀配流径向柱塞泵的工作原理径向柱塞泵的特点：流量大，压力高，便于作成多排柱塞的形式，工作可靠但径向尺寸大，自吸能力差，配流轴径向力不平衡，易磨损，间隙不能补偿，故限制了转速和压力的提高。

　　二、轴向柱塞泵特征：柱塞轴线平行或倾斜于缸体的轴线

　　1. 轴向柱塞泵的工作原理

　　1）斜盘式轴向柱塞泵组成：配油盘、柱塞、缸体、倾斜盘等工作原理：V密形成——柱塞和缸体配合而成右半周，V密增大，吸油 V密变化，缸体逆转〈左半周，V密减小，压油吸压油口隔开—配油盘上的封油区及缸体底部的通油孔

　　2）斜轴式轴向柱塞泵特点：传动轴轴线与缸体轴线倾斜一γ角。组成：工作原理：V密形成——同上右半周，吸油 V密变化——传动轴逆转〈左半周，压油吸压油口隔开——同上

　　2. 轴向柱塞泵的排量和流量

　　1）排量若柱塞数为z柱塞直径为d柱塞孔的分布圆直径为D 斜盘倾角为γ，则柱塞的行程为：h=Dtanγ故缸体转一转，泵的排量为： V=Zhπd /4= π d2 ZD(tanγ)/4 2）流量理论流量： qT = Vn = πd2D(tanγ)z/4 实际流量： q = qTηpv =πd2D(tanγ)zηpv/4 结论：

　　(1) qT = f(几何参数、 n、γ)

　　(2) n = c 大小变化，流量大小变化 γ〈方向变化，输油方向变化变量原理： ∵ γ= 0 q = 0 大小变化，流量大小变化 γ〈方向变化，输油方向变化 ∴ 轴向柱塞泵可作为双向变量泵瞬时流量：柱塞的轴向位移： s = a’b’=oa’-ob’ = Dtanγ/2 – Dcosωttanγ/2 = D(1-cosωt)tanγ/2 柱塞的瞬时移动速度： u = ds/dt = Dωtanγsinωt/2 单个柱塞的瞬时流量为： q‘=πd2u/4=πd2Dωtanγsinωt/8 ∵ 单个柱塞的瞬时流量按正弓玄规律变化 ∴ 整个泵的瞬时流量也按正弓玄规律变化故瞬时流量是脉动的，其脉动情况用脉动率δ来表示，一般： z = 奇数，δ小 z = 偶数，δ大常取z = 7 或z = 9

德国rexroth力士乐轴向柱塞泵工作原理

3. 轴向柱塞泵的结构

　　（1）斜盘式轴向柱塞泵

　　1）非通轴式轴向柱塞泵 CY14——1轴向柱塞泵主体部分：使泵具有自吸性能中心弹簧〈提高容积效率中心弹簧缸体端面间隙的自动补偿〈缸体底部通油孔p ** 除中心弹簧使缸体紧压配流盘外，柱塞孔底部的液压力也使缸体紧贴配流盘补偿端面间隙，提高了容积效率 A 滑靴和斜盘球形头部——和斜盘接触为点接触，接触应力大，易磨损。柱塞头部结构〈滑靴结构——和斜盘接触为面接触，大大降低了磨损。 B 柱塞和缸体

　　② CY14——1轴向柱塞泵变量机构手动*—转动手轮控制斜盘，改变倾角即可变量机构〈自动 2）通轴式轴向柱塞泵非通轴结构（半轴）：受力状态不佳，寿命短，噪声大，成本高。区别〈通轴结构：主轴采用两端支承，受力情况变好；在泵的外端安装一小型辅助泵简化油路。

　　（2）斜轴式轴向柱塞泵特点：传动轴轴线与缸体轴线倾斜一γ角。工作原理： V密形成——同上右半周，吸油 V密变化——传动轴逆转〈左半周，压油吸压油口隔开——同上 )

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德国rexroth力士乐轴向柱塞泵工作原理

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德国rexroth力士乐轴向柱塞泵工作原理

发布时间：2014-06-30