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(四)挂车及半挂车的牵引连接装置连接装置应能使挂车与牵引汽车方便、可靠地连接,并保证各种力的正确传递。全挂车的牵引连接装置包括牵引钩和牵引架。牵引钩有钩扣式、插销式和球销式;牵引架包括牵引辕杆、挂环和缓冲元件。为了接、摘挂的方便,牵引辕杆应保证左右能移动30°、上下倾斜70°～90°,且牵引环能自身转动60°。挂环分有间隙式和无间隙式两种,有间隙式挂环具有接挂容易、通用性好、工艺简单、制造成本低、能保证汽车列车的高度挠屈性等优
(D) trailer and semi-trailer traction connecting device connecting device should be able to make trailer and towing car convenient and reliable connection, and to ensure the correct transmission of various forces. Trailer towing connection devices include towing hook and towing frame. Traction hook with hook button, bolt and ball pin type; traction frame, including the traction rod, hanging ring and cushioning components. In order to pick, pick hanging convenient, pull the shaft should ensure that about 30 ° can be moved up and down tilted 70 ° ~ 90 °, and the traction ring can rotate 60 °. The hanging ring is divided into two types of gap type and no gap type. The gap type type hanging ring has the advantages of easy connection, good generality, simple process and low manufacturing cost, which can ensure high flexibility and flexibility of the automobile train.