What Is an Overrunning Clutch?

The overrunning clutch is a basic piece that appears with the development of mechatronics products. It is an important component for the power transmission and separation function between the prime mover and the working machine or between the driving and driven shafts inside the machine. It is a device with self-clutching function by using the speed change of the master and slave parts or the change of the rotation direction.

Overtaking clutch is with

The overrunning clutch is divided into a wedge overrunning clutch, a ball overrunning clutch and a ratchet overrunning clutch.

ZB / TJ19025-90

JB / T9130-2002

The main standards for overrunning clutches include CKA type, CKB type (B200 series), CKZ type, CKD type (UHF type), CKX type, NYD (NJ) type and other one-way contact type, and CKF and NF type non-contact wedges. Over 20 types of overrunning clutches (NF type backstops), CG roller overrunning clutches, CGK controllable overrunning clutches, and CKS two-way overrunning clutches, totaling more than 1,000 specifications series.

The wedge overrunning clutch uses a special wedge instead of a roller as a wedge tightening member. It is a clutch that uses a wedge and inner and outer raceways to form a friction pair. When there is no relative movement between the inner ring, the outer ring and the wedge, the torque can be transmitted only when the steering is the same and the rotation speeds are the same. Otherwise, they are all relatively sliding. Wedge overrunning clutches are mainly of basic type, without inner ring type and bearing type. Its connection forms are divided into key connection, gear connection, pulley connection, sprocket connection, bolt connection and so on.

Roller overrunning clutch roots are divided into two types: the outer star wheel and the inner star wheel. The so-called yoke refers to the conjugate surface of a cylinder and a cylindrical hole, and the star wheel has a recess to accommodate the roller. Slot parts. In order to facilitate processing and ensure processing accuracy, the inner star wheel is widely used. According to the shape of the star wheel working surface, it can be divided into three types: flat type, logarithmic spiral surface type and eccentric cylindrical surface type. Among them, flat type machining is simple and widely used, but its wedge contact angle does not change with the change of roller wear and contact position, but it is more difficult to process; the easiness of machining, performance and life of eccentric cylindrical surfaces are at the forefront. In between ^[1] .