Ball lock sheath

The invention discloses a ball lock sheath which is used to prevent a steel ball from falling off after a ball lock is unlocked. The ball lock sheath comprises a protective cylinder, an ejection cylinder, a back-up ring and an elastic element, the protective cylinder is in interference fit and connection with the ejection cylinder, the protective cylinder plays a limiting role via the back-up ring and a step surface of the ejection cylinder, and the elastic element acts a force on the ball lock sheath. According to the invention, a sheath structure is designed so that the steel ball is still in a ball socket after that the ball lock is unlocked, the steel ball is prevented from falling off when the ball socket is deformed due to the force, and the reliability and safety of a spaceflight product are improved. 本发明公开了种球锁护套，用于球锁解锁后防止钢球脱落，包括防护筒、顶出筒、挡圈和弹性元件，所述的防护筒与所述的顶出筒过盈配合连接，且所述的防护筒通过所述的挡圈和顶出筒的台阶面进行限位，所述的弹性元件用于施加作用力于所述的球锁护套。本发明通过设计护套结构，使得球锁解锁后钢球仍然处于球窝中，不会因球窝的受力变形而造成钢球的脱落，提升了航天产品的可靠性和安全性。