Patent ID: 7823864

Claim:
A plane braking device for an electric winch, comprising: a gear box ( 4 ), fixed on the electric winch; a braking cover ( 13 ), fixedly connected with the gear box; a section of hollow gear shaft ( 2 ), inserted in a shaft hole of the gear box and supported by a bearing ( 3 ); a section of core shaft ( 1 ), extending from a motor shaft and passing through the hollow gear shaft, wherein one extended end portion of the core shaft which extends out of the hollow gear shaft is a polyhedron; a wedge shape piece A ( 9 ), setting on the hollow gear shaft ( 2 ) and engaging with the hollow gear shaft, wherein a left end face of the wedge shape piece A is a cam face ( 16 ) formed by double tapered faces, a right end face of the wedge shape piece A is limited axially by a C-ring ( 10 ), and an outer double flange ( 15 ) structure is arranged along an outer circumference surface of the wedge shape piece A; a wedge shape piece B ( 8 ), setting on the hollow gear shaft ( 2 ), wherein a right end face of the wedge shape piece B is a cam face ( 16 ) formed by double tapered faces which engage with the wedge shape piece A, an outer double flange ( 15 ) structure is arranged on the outer surface along an outer circumference face of the wedge shape piece B; a plurality of braking plates ( 6 ); an elastic element ( 7 ), setting on the section of hollow gear shaft ( 2 ) and abutting against the wedge shape piece B ( 8 ); a braking clutch base ( 11 ), having a center setting on the end portion of the section of core shaft ( 1 ) and combined with the polyhedron of the end portion, wherein a bearing ( 12 ) supported between the braking clutch base ( 11 ) and the braking cover ( 13 ), and an inner double flange ( 19 ) structure is formed on an inner circumference face of the braking clutch base ( 11 ), matching to the outer double flange structures of the wedge shape piece A and the wedge shape piece B, to push the outer double flange structure of the wedge shape piece A to rotate thereby pushing the wedge shape piece B to move axially; wherein, a fixing ring ( 20 ), closely disposed on an inner shoulder of the gear box ( 4 ); a wedge shape support ( 5 ), setting on the section of hollow gear shaft ( 2 ); and a plurality of stopping pieces ( 21 ), disposed between the wedge shape support ( 5 ) and the wedge shape piece B ( 8 ) and surrounding the section of hollow gear shaft ( 2 ) and engaged and drive-connected with the section of hollow gear shaft ( 2 ), the braking plates( 6 )limited radially to rotate by a plurality of fixing rings ( 20 )and the elastic element( 7 )are disposed between the stopping pieces ( 21 ) and the wedge shape piece B.