中文摘要：

棘轮扳手因其可回程特性能够实现连续的装配操作,但其扳手头内部结构复杂且体积较大,难以在狭小空间内进行装配操作,因此提出一种用于狭小操作空间的新型柔性可回程扳手。通过在扳手中引入开口和柔性铰链,并在几何轮廓分析的基础上确定了开口与柔性铰链位置。运用回程过程中相对转动过程的几何约束关系以及旋紧过程中最大旋紧力矩给出柔性铰链及扳手头的关键尺寸的确定准则,实现了类似棘轮扳手的可回程功能,从而使柔性扳手在装配中可以实现连续操作,提高工作效率。柔性扳手结构简单,免于装配,降低了制作成本。进行柔性扳手的样机制作和螺纹紧固件的装配试验,验证了设计的可行性。

英文摘要：

Ratchet wrench is a commonly used tool during assembling operation for its reverse characteristic.But the large size and complicated structure of its head make it hard to use when the operation space is limited.A new kind of compliant reverse ratcheting wrench is thus proposed.By introducing a gap and a flexure hinge into the traditional wrench,and its locations are determined based on the geometrical outline analysis.The design principle of key parameters of the compliant reversible wrench is given based on the analysis of the geometrical constraints during the process of releasing bolt and the maximum torque during the tightening bolt process,which makes it possible to achieve the similar function as ratchet wrench so that the compliant wrench can achieve a continues movement during work process to increase efficiency.For its simple structure,the compliant wrench can be fabricated without assembly which lowers the cost.A prototype of the compliant wrench is demonstrated and tested which validates the feasibility of the design.