YUKEN油研A10-L-L-01-C-S-12变量泵
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齿轮泵在通过密封容积变化来完成能量转换的过程中,由于齿轮要旋转,零件相对运动表面间必须有配合间隙,因而高压没液沿着此间隙流回吸液腔,形成内部泄漏。从提高容积效率的观点出发,应尽量减小间隙,但间隙过小,将增加零件运动表面的摩擦损失,使机械效率下降,因此,内部泄漏和摩擦损失对配合间隙的要求是相矛盾的。
它主要由以下三个泄漏途径。
1)齿轮端面和前后端盖间的轴向间隙由于这种泄漏路短,泄漏面积大,因而泄漏量约占总泄漏量的75~80%,是齿轮泵的主要泄漏途径。试验表明,当轴向间隙增加0.01mm,泵的容积效率就可下降20%。
2)齿轮齿顶与泵体间的径向间隙由于齿轮旋转方向与泄漏方向相反,泄漏阻力较大,圆周泄漏路线较长,同时,由轴承有径向间隙,齿轮在高压油液作用下被压向吸液腔一侧,使此处的齿顶间隙几乎接近于零,所以径向间隙泄漏不大,一般只占总泄漏量的5~20%。若么向间隙增大0.1mm,齿轮泵的容积效率约降低0.25%。
3)齿轮轮齿啮合处齿面间隙由于啮合力使啮合齿面相互压紧,所以齿面间隙的泄漏很小,一般约占总泄漏量的4~5%,它主要取决于齿轮的制造精度。总之,要改善齿轮泵的工作状况,必须注意齿轮泵轴向间隙的泄漏,要选择合适的结构和适当的间隙,来提高齿轮泵的效率。
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