NJM-10型液压马达输出轴的密封结构,改进前(图a)是由普通的骨架式橡胶油封和O形圈组成组合式的接触型动密封。这种密封结构的油封唇口和沟槽圈互相接触装配的过盈量太小。同时,由于轴向与径向的振动、摆动、窜动等易引起唇口密封面分离。此外,沟槽与O形圈尺寸配合不相宜,沟槽圈外侧又没有施加机械密封力固定。因此,在密封面两侧存在 NJM-10-type hydraulic motor output shaft seal structure, before the improvement (Figure a) is a common skeleton rubber seal and O-ring combination of contact type dynamic seal. This seal structure of the oil seal lip and groove ring contact assembly interference is too small. At the same time, due to the axial and radial vibration, swinging, movement and other easy to cause lip sealing surface separation. In addition, the groove and O-ring with the size is not appropriate, outside the trench ring and no mechanical seal force applied to the fixed. Therefore, exists on both sides of the sealing surface