Electromechanical-magnetically integrated braking assistance device

1. An elenctromechanical-magnetically integrated braking assistance device, comprising an electrical motor ( 3 ) having a position sensor ( 3 ) and an ECU ( 3 b ), an oil holder ( 1 ), a braking main cylinder ( 2 ), an assistant force generating portion ( 4 ), and a pedal input rod( 8 ), characterized in that an absolute displacement sensor ( 7 ) or a relative displacement sensor ( 10 ) is connected to the pedal input rod ( 8 ), and an end of the pedal input rod ( 8 ) is inserted into the assistant force generating portion ( 4 ); a lead screw ( 9 ) is sleeved over the pedal input rod ( 8 ), and a ball nut ( 11 ) is sleeved over the lead screw ( 9 ); a ball nut bushing ( 6 ) is fixed to the ball nut ( 11 ) by being sleeved over the ball nut ( 11 ); a driven gear ( 12 ) is fixed to the ball nut bushing ( 6 ) by being sleeved over the ball nut bushing ( 6 ); and the electric motor ( 3 ) meshes with the driven gear ( 12 ) via a gear transmission mechanism ( 5 ) or a belt;

an end of the lead screw ( 9 ) which passes through the ball nut bushing ( 6 ) has an aperture, into which a feedback disc ( 18 ) is installed, wherein an end of the feedback disc ( 18 ) is connected to an end of an output rod ( 13 ) which is coaxially arranged with the lead screw ( 9 ) inside the assistant force generating portion ( 4 ), and another end of the output rod ( 13 ) extends into the braking main cylinder ( 2 ) and is connected to a piston of the braking main cylinder;

and an upper end of the braking main cylinder ( 2 ) is connected with the oil holder ( 1 ).

2. The electromechanical-magnetically integrated braking assistance device according to claim 1 , wherein a pair of guide rods ( 16 ) are arranged symmetrically at two sides of the ball nut bushing ( 6 ), and a guide connecting rod ( 17 ), two ends of which are sleeved over the guide rods ( 16 ), is sleeved over the lead screw ( 9 ) between the feedback disc ( 18 ) and the ball nut bushing ( 6 ).

3. The electromechanical-magnetically integrated braking assistance device according to claim 2 , wherein restoring springs ( 14 ) are sleeved over both the pedal input rod ( 8 ) and the output rod ( 13 ).

4. The electromechanical-magnetically integrated braking assistance device according to claim 3 , wherein a step ( 23 ) is arranged at the outer side of an end of the ball nut bushing ( 6 ) which is close to the feedback disc ( 18 ), a plurality of axially arranged sliding grooves are evenly provided around the circumference of the ball nut bushing ( 6 ), and a central hole of the driven gear ( 12 ) is provided with protrusions ( 21 ) for mating with the sliding grooves, wherein the driven gear ( 12 ) abuts against the step ( 23 ) and the protrusions ( 21 ) are embedded into corresponding sliding grooves.

5. The electromechanical-magnetically integrated braking assistance device according to claim 4 , wherein a bearing ( 22 ) is sleeved over the ball nut bushing ( 6 ) which closely abuts against the driven gear ( 12 ), an inner ring of the bearing ( 22 ) is embedded into the driven gear ( 12 ), and an outer ring of the bearing ( 22 ) is embedded into a housing.

6. The electromechanical-magnetically integrated braking assistance device according to claim 1 , wherein restoring springs ( 14 ) are sleeved over both the pedal input rod ( 8 ) and the output rod ( 13 ).

7. The electromechanical-magnetically integrated braking assistance device according to claim 6 , wherein a step ( 23 ) is arranged at the outer side of an end of the ball nut bushing ( 6 ) which is close to the feedback disc ( 18 ), a plurality of axially arranged sliding grooves are evenly provided around the circumference of the ball nut bushing ( 6 ), and a central hole of the driven gear ( 12 ) is provided with protrusions ( 21 ) for mating with the sliding grooves, wherein the driven gear ( 12 ) abuts against the step ( 23 ) and the protrusions ( 21 ) are embedded into corresponding sliding grooves.

8. The electromechanical-magnetically integrated braking assistance device according to claim 7 , wherein a bearing ( 22 ) is sleeved over the ball nut bushing ( 6 ) which closely abuts against the driven gear ( 12 ), an inner ring of the bearing ( 22 ) is embedded into the driven gear ( 12 ), and an outer ring of the bearing ( 22 ) is embedded into a housing.

9. The electromechanical-magnetically integrated braking assistance device according to claim 1 , wherein an output end of the electric motor ( 3 ) is installed with a drive gear ( 20 ) which meshes with the a speed changing gear ( 15 ) which in turn meshes with the driven gear ( 12 ).

10. The electromechanical-magnetically integrated braking assistance device according to claim 9 , wherein restoring springs ( 14 ) are sleeved over both the pedal input rod ( 8 ) and the output rod ( 13 ).

11. The electromechanical-magnetically integrated braking assistance device according to claim 10 , wherein a step ( 23 ) is arranged at the outer side of an end of the ball nut bushing ( 6 ) which is close to the feedback disc ( 18 ), a plurality of axially arranged sliding grooves are evenly provided around the circumference of the ball nut bushing ( 6 ), and a central hole of the driven gear ( 12 ) is provided with protrusions ( 21 ) for mating with the sliding grooves, wherein the driven gear ( 12 ) abuts against the step ( 23 ) and the protrusions ( 21 ) are embedded into corresponding sliding grooves.

12. The electromechanical-magnetically integrated braking assistance device according to claim 11 , wherein a bearing ( 22 ) is sleeved over the ball nut bushing ( 6 ) which closely abuts against the driven gear ( 12 ), an inner ring of the bearing ( 22 ) is embedded into the driven gear ( 12 ), and an outer ring of the bearing ( 22 ) is embedded into a housing.