An electromagnetic clutch of a brushless control-by-wire centrifugal ball arm engagement device

An electromagnetic clutch of a brushless control-by-wire centrifugal ball arm engagement device, which comprises an input shaft (11), an output shaft (21), an output shaft connecting disc (21P) and a brushless electromagnet (1WT), and is characterized in that:

• the electromagnetic clutch further comprises a brushless control-by-wire centrifugal ball arm engagement device (10);
• the brushless control-by-wire centrifugal ball arm engagement device (10) comprises a thrust pressing disc (10c), a driven inner-spline hub (10d), a control-by-wire driving disc (10g), a preloading spring (10i), a centrifugal ball arm hollow disc (10j), centrifugal ball arm pins (10k), centrifugal ball arms (10l), centrifugal balls (10m), a magnetic conductive force transmitting disk (10q), centrifugal ball sockets (10r) and a drive shaft (10Z);
• the drive shaft (10Z) has one end fixedly connected to one end of the input shaft (11);
• the centrifugal ball arm hollow disc (10j) is installed and supported on the intermediate journal of the drive shaft (10Z) by a bearing, and is provided with an outer-spline grooves of centrifugal ball arm hollow disc (10ja) on the outer circumferential surface of its end close to the input shaft (11);
• the control-by-wire drive disc (10g) is arranged on the outer-spline grooves of centrifugal ball arm hollow disc (10ja) by its inner-spline grooves;
• the preloading spring (10i) is disposed between the end of the outer-spline grooves of centrifugal ball arm hollow disc (10ja) and the inside end face of the control-by-wire drive disc (10g);
• the control-by-wire drive disc (10g) is further provided with a friction driving end face (10ga) at its end face close to the input shaft (11);
• the centrifugal ball arm hollow disc (10j) is provided with a plurality of centrifugal ball arm holders which are evenly arranged in the circumferential direction at its other end away from the input shaft (11), the centrifugal ball arm holders each having one centrifugal ball aim pin (10k) fixedly mounted thereon;
• the centrifugal ball arm (10l) has one end mounted on the intermediate journal of the centrifugal ball arm pin (10k) by its smooth bearing hole and is rotatable freely around the centrifugal ball arm pin (10k);
• the centrifugal ball arm (10l) has the other end provided with one centrifugal ball socket (10r), in each of which a centrifugal ball (10m) is provided and capable of rolling freely;
• the thrust pressing disc (10c) has one end face being a smooth end surface (10ca), on which the centrifugal ball (10m) each abuts against, and further has an outer-spline grooves provided on its outer circumferential surface, the outer-spline grooves of the thrust pressing disc (10c) being axially in sliding engagement with the inner-spline grooves of the driven inner-spline hub (10d);
• the driven inner-spline hub (10d) has an end face, which is away from the input shaft (11), fixedly connected to the output shaft connecting disc (21P), the output shaft connecting disc (21P) being fixedly mounted on the output shaft (21);
• the magnetic conductive force transmitting disk (10q) is fixedly mounted on the journal of the drive shaft (10Z) by a bearing hole of the center hub of magnetic conductive force transmitting disk (10qa);
• the magnetic conductive force transmitting disk (10q) is provided with an outer disc of magnetic conductive force transmitting disk (10qb), one end face of which close to the friction driving end face (10ga) keeps an air gap from the friction driving end face (10ga) by the action of the preloading spring (10i), the other end face of which is always keeping an air gap from a magnetic pole end face (1WTa) of the brushless electromagnet (1WT).