軸轂聯(lián)接的方式有鍵聯(lián)接、花鍵聯(lián)接、成形聯(lián)接、脹套聯(lián)接、銷聯(lián)接、緊定螺釘聯(lián)接、過盈聯(lián)接等，有些聯(lián)接方式僅用于軸轂聯(lián)接，有些聯(lián)接方式可兼作其它聯(lián)接。鍵和花鍵是常見的軸轂聯(lián)接方式。

The way of shaft hub connection includes key connection, spline connection, forming connection, expansion sleeve connection, pin connection, tight screw connection and interference fit. Some connection ways are only used for hub connection, and some connection ways can be used as other connecti. Key and spline are the most common hub connecti.

一個切向鍵只能傳遞一個方向的轉(zhuǎn)矩，傳遞雙向轉(zhuǎn)矩時，須用互成120°～130°角的兩個鍵。用于載荷很大，對中要求不嚴(yán)的場合。由于鍵槽對軸削弱較大 ，常用于直徑大于100mm的軸上。

A tangent key can only transfer the torque of one direction. When the two-way torque is passed, the two keys of 120 to 130 degrees are required. An occasion for heavy load and no strict requirement. As the keyway is greatly weakened to the axis, it is often used on a shaft with a diameter larger than 100mm.

機(jī)用虎鉗的結(jié)構(gòu)及原理。機(jī)用虎鉗是機(jī)械加工中常用的裝夾機(jī)構(gòu)，其結(jié)構(gòu)如圖1所示。其主要工作原理：轉(zhuǎn)動方頭帶動絲杠，在螺母（通過緊固螺釘固定在虎鉗體上）的作用下，做螺旋運(yùn)動的絲杠帶動與之聯(lián)接的活動座沿絲杠軸線方向來回移動。

The structure and principle of machine vise. Machine vise is a common clamping mechanism in mechanical processing. Its structure is shown in Figure 1. The main principle: rotation of the lead screw nut in the square, (fixed in the vise body through a fastening screw) under the action of moving spirally driven screw connected with the movable seat to move back and forth along the screw axis.

螺旋副的間隙大，旋轉(zhuǎn)時費(fèi)力，使用中穩(wěn)定性差。機(jī)用虎鉗開合行程大，螺旋副的運(yùn)行長度較長，為保證能夠快速裝夾，（金屬加工真不錯）機(jī)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(jìn)給量較大，使用時較費(fèi)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.