漸開線花鍵的定心方式為齒形定心。受載時齒上有徑向力，能起自動定心作用，有利于各齒受力均勻，強度高，壽命長。用于載荷較大，定心精度要求較高以及尺寸較大的聯接，如航空發(fā)動機、燃氣輪機、汽車等。壓力角45°的花鍵多用于輕載、小直徑和薄型零件的聯接。

The involute spline is centering in the shape of the tooth. The tooth has radial force on the tooth, and it can play the role of automatic centering, which is beneficial to the uniform force of each tooth, high strength and long life. It is used for large load, high precision and large size connection, such as aero engine, gas turbine, automobile and so on. The spline with a pressure angle of 45 degrees is used for the connection of light, small diameter and thin parts.

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

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.

型面聯接：是利用非圓剖面的軸與相應形狀的零件的轂孔配合而構成的聯接，作為機械傳動中的聯接方式，型面聯接相對于傳統(tǒng)的鍵聯接相比，具有聯接強度高，沒有應力集中，可以傳遞大扭矩且的同時也可以承受沖擊載荷，并且對于一些大型機械裝備來講其拆裝方便及維修便利。

is the hub hole type surface connection: the non-circular section axis and the corresponding shape parts with a connection, as the connection mode in mechanical transmission, compared with the traditional linkage type surface connection compared with connecting strength, no stress , can  large torque and high efficiency at the same time it can withstand the impact load, and for some large mechanical equipment for its disassembly and convenient maintenance.