The invention provides a wedge-block
electromagnetic clutch, and belongs to the technical field of
mechanical transmission. The
electromagnetic clutch comprises a half-
coupling, a main shaft, wedge blocks, a
retainer, torsion springs, isolation blocks, a compression spring, a
clutch pin, an
electromagnet and an armature, wherein the axes of the half-
coupling and the main shaft are superposed, the
retainer is located in an annular space formed by the shaft-
diameter surface of the main shaft and the inner cylindrical surface of the half-
coupling, a group of the torsion springs is uniformly distributed on the annular
retainer, and splayed wedge block groups formed by the wedge blocks and the isolation blocks are also uniformly distributed on the circumference of the retainer; and the
clutch pin provided with the compression spring at one end penetrates through the isolation blocks and is fixedly connected to the armature, and the
electromagnet movably sleeves the main shaft and is fixed to a rack. The
electromagnetic clutch provided by the invention is capable of increasing the transfer torque thereof, fast in engagement reaction, capable of reducing the power and
energy consumption of operating the
electromagnet, compact in structure, and convenient to install.