Universal coupling is a special coupling, divided into two categories: precision universal coupling and high-torque universal coupling. It is a movable rigid coupling used on two intersecting shafts. The large included angle between the two axes can reach 45°, which is widely used in machine tools, automobiles, precision machinery and heavy machinery. The universal coupling is formed by connecting two fork-shaped parts and a cross-shaped part. When the driving shaft rotates at a constant angular velocity ω 1, if the angle between the two axes is α, the angular velocity ω 2 of the driven shaft will periodically change within the range of ω 1cosα ≤ω 2≤ω 1/cosα, causing additional Dynamic load. Therefore, a single universal coupling is not suitable for the connection with high speed and large angle between the two axes. In order to overcome the above shortcomings, a double universal coupling can be used, that is, an intermediate shaft is used to connect two universal couplings. During installation, the axis angles of the main and driven shafts and the intermediate shaft are equal, and the two The fork-shaped parts at the end are in the same plane, so that the angular velocity of the driving shaft and the driven shaft can be equal at any time. The instantaneous speed of the two shafts can be approximately equal by using the ball-cage universal coupling and the ball-groove universal coupling. SWC type and SWP type cross shaft universal couplings can be widely used in metallurgy, lifting, engineering transportation, mining, petroleum, shipbuilding, coal, rubber, paper machinery and other heavy machinery industries to transmit torque in mechanical shafting . The main features of SWC type and SWP type cross shaft universal joint are: 1. It has a large angle compensation capability. , Axis angle, SWC type axis angle can reach 15 degrees ~ 25 degrees, SWP type can reach about 10 degrees. 2. The structure is compact and reasonable. SWC type adopts integral fork head, which makes the transportation more reliable. 3. Large carrying capacity. Compared with other types of couplings with the same rotation diameter, the torque transmitted by it is larger. This is more advantageous for mechanical equipment with restricted rotation diameter. 4. High transmission efficiency. Its transmission efficiency is 98-99.8%, and it is used for high-power transmission with obvious energy saving effect. 5. Stable transportation, low noise, easy assembly and disassembly and maintenance.