凡是在軸轂聯(lián)接中不用鍵、花鍵或銷時的聯(lián)接，統(tǒng)稱為無鍵聯(lián)接。無鍵聯(lián)接中我們介紹兩個常用的型面聯(lián)接和過盈配合聯(lián)接。

The connection of no key, spline or pin in the hub connection is called the keyless connection. In keyless joins, we two commonly used type face joins and interference fit connecti.

機用虎鉗結(jié)構(gòu)缺點及使用中的隱患。機用虎鉗有結(jié)構(gòu)簡單、夾緊力大、操作和維護方便等特點。但由于其必須具有廣泛的適用性和操作的便捷性，其螺母與絲桿之間、活動座與虎鉗體之間存在著較大的配合間隙，導致在裝夾一些加工精度要求較高的產(chǎn)品時難以達到要求。

The structural shortcomings of the machine vise and the hidden danger in the use. The machine tool has the characteristics of simple structure, large clamping force, easy operation and maintenance. But because of its wide applicability and convenient operation, there is a large gap between the nut and the screw rod, the movable seat and the vice body, which results in the difficulty of meeting some requirements when clamping some products with high machining accuracy.

螺旋副的間隙大，旋轉(zhuǎn)時費力，使用中穩(wěn)定性差。機用虎鉗開合行程大，螺旋副的運行長度較長，為保證能夠快速裝夾，（金屬加工真不錯）機用虎鉗螺旋副的螺距較大。較大的螺距意味著較大的螺旋升角，轉(zhuǎn)動單圈進給量較大，使用時較費力；較大的螺距需要更大的配合間隙來確保螺旋副的正常使用。

The clearance of the helix pair is large, the rotation is hard and the stability of the use is poor. The machine has large opening and closing stroke, and the operation length of the screw pair is longer. In order to ensure quick clamping, metal machining is good. Larger pitch means larger spiral angle, larger single turn feed and more laborious use. Larger pitch needs more fit clearance to ensure the normal use of screw pair.

裝夾后產(chǎn)品靠近活動鉗口附近容易上翹、抬起，多次裝夾一致性差。傳統(tǒng)機用虎鉗的螺旋副間隙較大，在使用中會產(chǎn)生較大振幅的振動；而活動座和虎鉗體之間的滑動接觸面較大，采用的間隙也較大。

After the clamping, the product is easy to  and lifted near the movable jaw, and the cistency of the clamping is poor many times. The spiral pair clearance of traditional machine vice is bigger, which will cause large amplitude vibration in use. The sliding contact between movable seat and jaw vice body is larger, and the gap used is bigger.