Key to Standard Fasteners: Definition, Classification and Application
Release time:
2024-07-12
As an important standard fastener, the key is mainly used to connect the shaft and the transmission part on the shaft to achieve circumferential fixation and transmit torque. This article will detail the definition of the key, classification and its application in various mechanical equipment.
Definition of 1. Key
The key is a mechanical part used to connect the shaft and the transmission parts (such as gears, pulleys, etc.) on the shaft. The key groove is matched with the key groove on the shaft and the transmission part to achieve circumferential fixation and transmit torque. The key connection has the advantages of simple structure, reliable work, convenient assembly and disassembly, and is one of the commonly used connection methods in mechanical equipment.
Classification of 2. keys
Keys can be divided into many types according to their different structural shapes and working principles, mainly including flat keys, semicircular keys, wedge keys, tangential keys and splines.
- Flat key: The most widely used, its two sides are working surfaces, and there is a gap between the upper surface and the bottom of the hub groove. Flat key according to different uses, can be divided into ordinary flat key, guide flat key and slide key three.
- half circle key: Its side surface is a working surface, and the key can swing around its geometric center in the groove to adapt to the slope of the bottom surface of the hub keyway.
- Wedge key: The upper and lower surfaces of the wedge key are working surfaces, and the upper surface of the key and the bottom surface of the hub keyway have a slope of 1:100.
- Tangential key: Composed of two ordinary wedge keys with a slope of 1:100. The working surface is parallel to each other up and down, the two keys are narrow at the head, wide at the tail, close fitting of the inclined surface, small extrusion stress on the working surface, good neutrality, uniform force on the keys, and high strength.
- Spline: Spline is a key connection in which multiple key teeth and keyways are evenly distributed on the shaft and the circumferential wall of the hole. Splines are divided into two categories, rectangular splines and involute splines, both of which are widely used.
Application of 3. keys
Keys are widely used in mechanical equipment, such as automobile engines, machine tools, reducers, etc. They realize the circumferential fixation and torque transmission between the shaft and the transmission parts through the key connection, ensuring the normal operation of the mechanical equipment.
Manufacturing standard fastener pins and keys; Non-standard precision cylindrical, high-pressure water pumps; professional enterprises of mechanical processing services, to undertake the customized production of non-standard parts and stainless steel pins, keys and other products required by users.
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