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切向鍵聯接：它由兩個普通楔鍵組成。其上下兩面（窄面）為工作面，其中之一面在通過軸心線的平面內。工作面上的壓力沿軸的切線方向作用，能傳遞很大的轉矩。

Tangent key join: it cists of two common wedges. Both sides of the upper and lower sides (narrow surface) are working faces, one of which is in the plane of the axis of the axis. The pressure on the working face acts along the direction of the shaft and transmit a large torque.

一個切向鍵只能傳遞一個方向的轉矩，傳遞雙向轉矩時，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.

花鍵聯接按齒形的不同，可分為矩形花鍵和漸開線花鍵兩類，這兩類花鍵均已標準化。

矩形花鍵的定心方式為小徑定心，即外花鍵和內花鍵的小徑為配合面。其特點是定心精度高，定心的穩定性好，能用磨削的方法消除熱處理引起的變形。

The spline connection can be divided into two types: rectangular spline and involute spline. The two kinds of spline are standardized.

The centering way of the rectangular spline is the small diameter centering, that is, the small diameter of the outer spline and the inner spline is the matching surface. It is characterized by high centering precision and good stability of centering. It can be used to remove the deformation caused by heat treatment by grinding.

勝過機用虎鉗的柔性虎鉗，在裝夾中能有效防止工件的翻轉、傾斜，克服了機用虎鉗因配合間隙大導致工件受力不均、加工發顫等現象；解決了現有輕型、精密工件加工時裝夾不可靠的問題。

Flexible than vice machine vise, the clamping can effectively prevent the workpiece turning and tilt, overcome the machine vise for clearance to workpiece uneven stress, etc. to solve the phenomenon of processing tremble; the existing light and precision workpiece clamping reliability of the fashion。