Overrunning clutch can be divided into two types according to the working principle: meshing type and friction type. Meshing overclutch mainly includes ratchet type, sliding pin type and tooth embedded type. Although the structure of meshing clutch is simple, it is generally used in low-speed occasions due to the impact and noise of engagement. Friction overrunning clutch engagement is relatively stable, liugong loader accessories can be engaged in any speed difference. Friction overrunning clutch is mainly divided into roller clutch, spring clutch and diagonal clutch.

Spring clutch is mainly composed of input shaft, output shaft, rectangular spring and guide mandrel parts. The rectangular cross-section helical spring of the clutch is installed between the input shaft and the output shaft. The two ends of the spring have large radial dimensions, forming interference fit with the inner surface of the input and output shafts, while the middle part of the spring has small radial dimensions, forming clearance fit with the inner surface of the input and output shafts.

Winding direction of the spring is certain, when the rotation direction of the input shaft and output shaft rotate in the same direction, and the input shaft speed is faster than the output shaft speed, due to the friction at the ends of the spring, spring radial outward expansion, make the middle part of spring also close to the input shaft and output shaft, the genus is the input shaft and output shaft to form a whole, the clutch in the transmission state.

When the relative rotation direction of the input shaft and the output shaft is opposite, due to the action of friction, the two ends of the spring contract in the radial, the input and output shaft appear slipping, at this time the clutch is in the state of overrunning. At present, the spring clutch has not been used in China.

Use model：835、842、50C、855、50CN、856