论文部分内容阅读
一、低速高扭矩液压马达的一般问题众所周知,液压马达的有效平均扭矩 M_(cp)可以下式表示M_(cp)=1/(2π)pVη_M (1)式中 p—工作液体单位压力;η_M 一机械效率;V—马达每转的排量。对于柱塞式液力机械,其排量可以写成V=π/4d_n~2·Z·S·K (2)式中 K—转子(或定子)每转一转每个柱塞完成的冲程数;d_n —柱塞直径;Z—柱塞数目;S—柱塞行程。因此,从(1)式显而易见,要增大液压马达的扭矩只能从提高工作油压 p,或增大排量 V 着手。目前高扭矩液压马达的工作油压一般都在100公斤/公分~2以上,也有用到400公斤/公分~2或更高的。但继续提高油压会带来许多结构上的困难。密封不易,容积效率剧烈下降,整个传动系统的结构也相应增大。所以增大液压马达的排量的方法也为各国所普遍重视。
First, the general problem of low speed high torque hydraulic motor As we all know, hydraulic motor effective average torque M_ (cp) can be expressed as M_ (cp) = 1 / (2π) pVη_M (1) where p- working fluid pressure unit; η_M A mechanical efficiency; V-motor displacement per revolution. For the plunger hydraulic machinery, the displacement can be written as V = π / 4d_n ~ 2 · Z · S · K (2) Where K-rotor (or stator) per revolution per revolution of the piston stroke ; d_n - plunger diameter; Z-plunger number; S-plunger stroke. Therefore, it is obvious from (1) that increasing the torque of the hydraulic motor can only be started by increasing the working oil pressure p or increasing the displacement V. Currently high-torque hydraulic motor hydraulic pressure are generally 100 kg / cm ~ 2 above, but also useful to 400 kg / cm ~ 2 or higher. However, there are many structural difficulties associated with continuing to increase the oil pressure. Seal is not easy, dramatic decline in volumetric efficiency, the structure of the entire transmission system also increased accordingly. Therefore, increasing the displacement of the hydraulic motor is also a universal priority for all countries.