The invention relates to an electro-mechanical brake with an actuator (5) for pressing at least one brake pad (3, 4) against a rotating friction surface. The actuator (5) comprises an electric motor (7) and a first transmission for converting a rotary motion of the electric motor (7) into a translat
The invention relates to an electro-mechanical brake with an actuator (5) for pressing at least one brake pad (3, 4) against a rotating friction surface. The actuator (5) comprises an electric motor (7) and a first transmission for converting a rotary motion of the electric motor (7) into a translational motion of the at least one brake pad (3, 4) for activating or releasing the electro-mechanical brake. Furthermore, the actuator (5) comprises a second transmission for converting a rotary motion of the same electric motor (7) into a further translational motion of the at least one brake pad (3, 4) to compensate for a wear of the at least one brake pad (3, 4), the first transmission and the second transmission being coupled so that the translational motion of the at least one brake pad (3, 4) caused by the first transmission and the further translational motion of the at least one brake pad (3, 4) caused by the second transmission add up to a resulting translation of the at least one brake pad (3, 4).
대표청구항▼
1. An electro-mechanical brake with an actuator (5) for pressing at least one brake pad (3, 4) against a rotating friction surface, the actuator (5) comprising: an electric motor (7); anda first transmission for converting a rotary motion of the electric motor (7) into a translational motion of the
1. An electro-mechanical brake with an actuator (5) for pressing at least one brake pad (3, 4) against a rotating friction surface, the actuator (5) comprising: an electric motor (7); anda first transmission for converting a rotary motion of the electric motor (7) into a translational motion of the at least one brake pad (3, 4) for activating or releasing the electro-mechanical brake,characterized in thatthe actuator (5) further comprises a second transmission for converting a rotary motion of the same electric motor (7) into a further translational motion of the at least one brake pad (3, 4) to compensate for a wear of the at least one brake pad (3, 4), the first transmission and the second transmission being coupled so that the translational motion of the at least one brake pad (3, 4) caused by the first transmission and the further translational motion of the at least one brake pad (3, 4) caused by the second transmission add up to a resulting translation of the at least one brake pad (3, 4). 2. The electro-mechanical brake of claim 1, characterized in that the actuator (5) comprises at least two pushing pins (6) for pushing against the brake pad (3) or against one of the brake pads (3, 4), wherein the first transmission is configured for converting a rotary motion of the electric motor (7) into a translational motion of the pushing pins (6) and wherein the second transmission is an adjustment mechanism for adjusting a variable length of the pushing pins (6) to the wear of the at least one brake pad (6), the adjustment mechanism comprising: a mechanism for converting a rotational motion of a rotary part (18) of each of the pushing pins (6) into a length variation of the pushing pins (6); andat least one elastic arm (20) arranged at an outer rim of a rotating part (21) of the first transmission to engage with a pinion (19) provided at the rotary part (18) of at least one of the pushing pins (6). 3. The electro-mechanical brake of claim 2, characterized in that each of the pushing pins (6) is provided with a pinion (19) at its rotary part (18) and that the adjustment mechanism comprises an elastic arm (20) for each of the pushing pins (6), the elastic arms (20) being arranged at the outer rim of the rotating part (21) of the first transmission to engage with the pinion (19) of the respective pushing pin (6). 4. The electro-mechanical brake of claim 2 characterized in that the elastic arm (20) is arranged so that it does not engage with the pinion (19) of the respective pushing pin (6) or with any of the pinions (19) of the pushing pins (6) if the said rotating part (21) is rotated within an interval of rotation angles corresponding to a normal operation of the electro-mechanical brake. 5. The electro-mechanical brake of claim 4, characterized in that the elastic arm (20) is arranged so that it may engage with the pinion (19) of the respective pushing pin (6) if the rotating part (21) is rotated in a range of rotation angles lying beyond a limit of the said interval in a direction of rotation corresponding to a release of the electro-mechanical brake. 6. The electro-mechanical brake of claim 2, characterized in that the elastic arm (20) is arranged to drive the rotary part (18) of the respective pushing pin (6) for increasing the length of the pushing pin (6) if the elastic arm (20) is engaged with the pinion (19) of the pushing pin (6) and if the rotating part (21) of the first transmission is rotated in a first direction, while the elastic arm (20) is configured to slide over the pinion (19) of the pushing pin (6) without rotating the rotary part (18) of the pushing pin (6) if the elastic arm (20) contacts the pinion (19) during a rotation of the rotating part (18) in a reverse direction. 7. The electro-mechanical brake of claim 6, characterized in that the first direction is the direction of rotation of the rotating part (21) corresponding to a release of the electro-mechanical brake, while the reverse direction is a direction of rotation of the rotating part (21) corresponding to an activation of the electro-mechanical brake. 8. The electro-mechanical brake of claim 6, characterized in that the adjustment mechanism comprises at least one further elastic arm (24) arranged at the outer rim of the said rotating part (21) of the first transmission to engage with the pinion (19) provided at the rotary part (18) of at least one of the pushing pins (6), the further elastic arm (24) being arranged so that it does not engage with the pinion (19) of the respective pushing pin (6) or with any of the pinions (19) of the pushing pins (6) if the said rotating part is rotated within the said interval of rotation angles corresponding to the normal operation of the electro-mechanical brake, while it may engage with the pinion (19) of the respective pushing pin (6) if the rotating part (21) is rotated in the said range of rotation angles lying beyond the said limit of the said interval, wherein the further elastic arm (24) is arranged to drive the rotary part (18) of the respective pushing pin (6) for reducing the length of the pushing pin (6) if the further elastic arm (24) is engaged with the pinion (19) of the pushing pin (6) and if the rotating part (21) of the first transmission is rotated in the said reverse direction, while the further elastic arm (24) is configured to slide over the pinion (19) of the pushing pin (6) without rotating the rotary part (18) of the pushing pin (6) if it contacts the pinion (19) during a rotation of the rotating part (21) in the first direction. 9. The electro-mechanical brake of claim 2, characterized in that each of the pushing pins (6) has a screw thread as a constituent of the adjustment mechanism, one of a nut and a lead screw of the screw thread being given by or part of the said rotary part (18) of the pushing pin (6). 10. The electro-mechanical brake of claim 1, characterized in that the first transmission comprises a reduction gear for converting a rotational speed of a shaft of the electric motor (7) and/or a ball ramp mechanism for converting an output of the electric motor (7) or of the reduction gear into the translational motion. 11. The electro-mechanical brake of claim 10, characterized in that the reduction gear comprises a toothed belt drive and/or a planetary gear. 12. The electro-mechanical brake of claim 10, characterized in that the ball ramp mechanism comprises a fixed plate (15), a rotating plate (16) and balls (17) arranged between the fixed plate (15) and the rotating plate (16) for rolling in ramp grooves provided in a surface of the fixed plate (15) and in a surface of the rotating plate (16), the said rotating part (21) being identical with or connected to the rotating plate (16) of the ball ramp mechanism. 13. The electro-mechanical brake of claim 1, further comprising: a position sensor for detecting a position of the electric motor (7) and/or of the first transmission; anda control unit for controlling the electric motor (7) to drive the second transmission, wherein the control unit is configured for:determining a free play of the electro-mechanical brake by detecting a dependence between an output torque and/or a power consumption of the electric motor (7) and the position detected by the position sensor; anddriving the second transmission for reducing the free play if the determined free play is larger than a given threshold value.
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