A six-gear automatic transmission for automobile with a brushless control-by-wire centrifugal ball arm engagement device, which comprises an input shaft (1Z), an output shaft (2Z), a central input gear (1), an input gear of first gear (11), an input gear of second gear (12), an input gear of third gear (13), an input gear of fifth gear (15), an input gear of sixth gear (16), an input gear of reverse gear (17), a driving gear of first gear (21), a driving gear of second gear (22), a driving gear of third gear (23), a driving gear of fifth gear (25), a driving gear of sixth gear (26), a driving gear of reverse gear (27);
- said central input gear (1) is fixedly mounted on the input shaft (1Z), and engaged with the input gear of first gear (11), the input gear of second gear (12), the input gear of third gear (13), the input gear of fifth gear (15), the input gear of sixth gear (16) and the input gear of reverse gear (17) respectively along outer circumference of the central input gear (1);the six-gear automatic transmission is characterized in that:
- the six-gear automatic transmission further comprises seven brushless control-by-wire centrifugal ball arm engagement devices (10), a brushless electromagnet of first gear (1WT), a brushless electromagnet of second gear (2WT), a brushless electromagnet of third gear (3WT), a brushless electromagnet of fourth gear (4WT), a brushless electromagnet of fifth gear (5WT), a brushless electromagnet of sixth gear (6WT), a brushless electromagnet of reverse gear (7WT);
- the brushless control-by-wire centrifugal ball arm engagement device (10) each 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 centrifugal ball arm hollow disc (10j) is rotatably supported on the drive shaft (10Z) by a bearing, and is provided with outer-spline grooves of centrifugal ball arm hollow disc (10ja) on the outer circumferential surface of one end of the centrifugal ball arm hollow disc (10j);
- the control-by-wire drive disc (10g) is arranged on the outer-spline grooves of centrifugal ball arm hollow disc (10ja) by inner-spline grooves of the control-by-wire drive disc (10g);
- the preloading spring (10i) is disposed between the end of the outer-spline grooves of centrifugal ball arm hollow disc (10ja) and an inside end face of the control-by-wire drive disc (10g);
- the control-by-wire drive disc (10g) is provided with a friction driving end face (10ga);
- 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 other end of the centrifugal ball arm hollow disc (10j), each centrifugal ball arm holders having one of the centrifugal ball arm pins (10k) fixedly mounted thereon;
- each centrifugal ball arm (10l) has one end mounted on the intermediate journal of one of the centrifugal ball arm pins (10k) by a smooth bearing hole of the centrifugal ball arm (10l) and is rotatable freely around the centrifugal ball arm pin (10k);
- each centrifugal ball arm (10l) has the other end provided with one of the centrifugal ball sockets (10r), in which one of the centrifugal balls (10m) is provided and capable of rolling freely;
- the thrust pressing disc (10c) has one end face being a smooth end surface (10ca), against which the centrifugal balls (10m) abuts, and further has outer-spline grooves provided on its-outer circumferential surface of the thrust pressing disc (10c);
- the outer-spline grooves of the thrust pressing disc (10c) is axially in sliding engagement with the inner-spline grooves of the driven inner-spline hub (10d);
- the magnetic conductive force transmitting disk (10q) is fixedly mounted on the journal of the drive shaft (10Z) by a bearing hole of a center inner 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 brushless control-by-wire centrifugal ball arm engagement device (10), as the power transmission engagement device for the first gear, is provided between the input gear of first gear (11) and the driving gear of first gear (21);
- one end of the drive shaft (10Z) of the brushless control-by-wire centrifugal ball arm engagement device (10) is connected to the input gear of first gear (11);
- said brushless electromagnet of first gear (1WT) is provided between the brushless control-by-wire centrifugal ball arm engagement device (10) and the input gear of first gear (11);
- one brushless control-by-wire centrifugal ball arm engagement device (10), as the power transmission engagement device for the second gear, is provided between the input gear of second gear (12) and the driving gear of second gear (22);
- one end of the drive shaft (10Z) of the brushless control-by-wire centrifugal ball arm engagement device (10) is connected to the input gear of second gear (12);
- said brushless electromagnet of second gear (2WT) is provided between the brushless control-by-wire centrifugal ball arm engagement device (10) and the input gear of second gear (12);
- one brushless control-by-wire centrifugal ball arm engagement device (10), as the power transmission engagement device for the third gear, is provided between the input gear of third gear (13) and the driving gear of third gear (23);
- one end of the drive shaft (10Z) of the brushless control-by-wire centrifugal ball arm engagement device (10) is connected to the input gear of third gear (13);
- said brushless electromagnet of third gear (3WT) is provided between the brushless control-by-wire centrifugal ball arm engagement device (10) and the input gear of third gear (13);
- one brushless control-by-wire centrifugal ball arm engagement device (10), as the power transmission engagement device for the fourth gear, is provided between the central input gear (1) and the output shaft (2Z):
- one end of the drive shaft (10Z) of the brushless control-by-wire centrifugal ball arm engagement device (10) is connected to the input shaft (1Z);
- said brushless electromagnet of fourth gear (4WT) is provided between the brushless control-by-wire centrifugal ball arm engagement device (10) and the central input gear (1);
- one brushless control-by-wire centrifugal ball arm engagement device (10), as the power transmission engagement device for the fifth gear, is provided between the input gear of fifth gear (15) and the driving gear of fifth gear (25);
- one end of the drive shaft (10Z) of the brushless control-by-wire centrifugal ball arm engagement device (10) is connected to the input gear of fifth gear (15);
- said brushless electromagnet of fifth gear (5WT) is provided between the brushless control-by-wire centrifugal ball arm engagement device (10) and the input gear of fifth gear (15);
- one brushless control-by-wire centrifugal ball arm engagement device (10), as the power transmission engagement device for the sixth gear, is provided between the input gear of sixth gear (16) and the driving gear of sixth gear (26);
- one end of the drive shaft (10Z) of the brushless control-by-wire centrifugal ball arm engagement device (10) is connected to the input gear of sixth gear (16);
- said brushless electromagnet of sixth gear (6WT) is provided between the brushless control-by-wire centrifugal ball arm engagement device (10) and the input gear of sixth gear (16);
- one brushless control-by-wire centrifugal ball arm engagement device (10), as the power transmission engagement device for the reverse gear, is provided between the input gear of reverse gear (17) and the driving gear of reverse gear (27);
- one end of the drive shaft (10Z) of the brushless control-by-wire centrifugal ball arm engagement device (10) is connected to the input gear of reverse gear (17);
- said brushless electromagnet of reverse gear (7WT) is provided between the brushless control-by-wire centrifugal ball arm engagement device (10) and the input gear of reverse gear (17);
- and
- the brushless electromagnet of first gear (1WT), the brushless electromagnet of second gear (2WT), the brushless electromagnet of third gear (3WT), the brushless electromagnet of fourth gear (4WT), the brushless electromagnet of fifth gear (5WT), the brushless electromagnet of sixth gear (6WT), the brushless electromagnet of reverse gear (7WT) are all fixedly mounted on a transmission housing by a non-magnetic conductive material.