CN104443368B - By the electric brake actuator that force snesor and ball-screw are integrated - Google Patents
By the electric brake actuator that force snesor and ball-screw are integrated Download PDFInfo
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- CN104443368B CN104443368B CN201410653859.2A CN201410653859A CN104443368B CN 104443368 B CN104443368 B CN 104443368B CN 201410653859 A CN201410653859 A CN 201410653859A CN 104443368 B CN104443368 B CN 104443368B
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Abstract
A kind of electric brake actuator integrated by force snesor and ball-screw, ball-screw component is located in housing.Nut is cylindrical shape, leading screw is housing shape, and helical form half slot is machined with respectively in nut inner surface and leading screw outer surface, and it is identical with the radius of the helical form half slot on leading screw outer surface to be located at nut inner surface respectively, spiral angle is also identical, after the helical form half slot on nut inner surface and leading screw outer surface cooperatively forms the helicla flute of full circle, closed helical raceway is formd, ball is rolled in the closed helical raceway.The present invention is integrated with ball-screw by force snesor, and force snesor is located in the endoporus of ball-screw, reduces the loss of power transmittance process, and measurement accuracy is improved to about 3 ‰ by the 1% of prior art.The present invention also have it is simple in construction, the characteristics of be easily achieved.
Description
Technical field
It is specifically by the integrated aircraft electric brake actuator structure of force snesor and ball-screw the present invention relates to aircraft electric brake actuator.
Technical background
Electric Brake System of Aircraft is the new technology for starting to be applied in recent years, and electric brake uses electromechanical actuator as brake actuating mechanism.Electromechanical actuator is typically made up of parts such as motor, reduction gearing and ball-screws.Produce and be used as power when electromechanical actuator works, dynamic and static brake disc phase mutual friction is produced braking moment by extruding brake disc.Electromechanical actuator uses multi-stage speed-reducing, and driving-chain is complicated, being used as power for electromechanical actuator generation is met certain control accuracy requirement, it is necessary to carry out closed-loop control using force snesor in electromechanical actuator.
At present, the electromechanical actuator force snesor commonly used both at home and abroad is all arranged between ball-screw and electromechanical actuator housing, and braking action power is measured indirectly by the reaction force between ball-screw or actuator housing.
In United States Patent (USP) 7565953, stress-strain piece is arranged on the crossbeam between top cover and case top lid, during brake, ball-screw transfers force to top cover by active force and reaction force principle, and top cover transfers force to crossbeam by screw.The both sides boss of crossbeam is deformed by the downward power of case top lid, middle part by the upward power of screw, and deformation of the foil gauge being attached on crossbeam by sensing crossbeam carries out dynamometry.The shortcoming of this structure is：Electromechanical actuator housing meeting irregular deformation in stand under load, deformation can influence the dynamometry precision of sensor；The deformation of housing can influence on the centre of location of reduction gearing away from generation, and then influence actuator transmission efficiency and service life.
Xi'an Aviation Brake Technology Co., Ltd. proposes a kind of machine electric brake actuator for aircraft brake system, and wherein force snesor is located between case top lid and the guide rod of ball-screw component.During brake, motor is after deceleration, and drive nut rotates, and the torque of nut is changed into the straight line force of leading screw by ball and screw thread, and leading screw band piston is braked.Reaction force suffered by ball-screw is acted on by ball screw and plane bearing on the force transmitting board of guide rod positioning key, is then passed on the force cell between guide rod force transmitting board and gland.The shortcoming of this structure is that the axial dimension of sensor can substantially increase the axially mounted space of actuator.
For these problems, the present invention proposes a kind of electric brake actuator structure that force snesor and ball-screw is integrated.Its architectural feature is：Force snesor is integrated with ball-screw, during force snesor is located in the endoporus of ball-screw or force snesor and ball-screw are made of one formula structure.
The content of the invention
To overcome, transmission efficiency present in prior art is low, service life is short, and the larger deficiency of structural volume, and the present invention proposes a kind of electric brake actuator integrated by force snesor and ball-screw.
The present invention includes housing, ball-screw component, needle bearing, force sensor module, data wire, push rod, needle roller thrust bearing, deep groove ball bearing, preloading spring, spring pad, collar, dynamic seal ring and heat insulating mattress.
Described housing includes middle housing, lower house and case top lid, and ball-screw component is located in housing.The ball-screw component includes leading screw, nut and ball.The top of nut external peripheral surface in ball-screw component is coordinated by needle bearing and middle shell inner surface；The inner surface for the upper hole wall at maximum diameter of hole that the upper surface of the toothed disc of the nut lower end external peripheral surface passes through needle thrust bearing and middle housing coordinates；The external peripheral surface of the nut lower end end is coordinated by the inner surface of deep groove ball bearing and lower house.The push rod is located in ball-screw component, and the lower end of the push rod is located in the central channel of heat insulating mattress, and upper end and the force sensor module of the push rod coordinate.Force sensor module is located at the upper end of leading screw endoporus.
The heat insulating mattress is located at the lower end of ball-screw component, and the groove walls at the heat insulating mattress center is located in leading screw.Preloading spring is installed between the groove walls outer surface at the heat insulating mattress center and the leading screw inner surface.
Helical form half slot is machined with respectively in nut inner surface and leading screw outer surface, and it is identical with the radius of the helical form half slot on leading screw outer surface to be located at nut inner surface respectively, spiral angle is also identical, after the helical form half slot on nut inner surface and leading screw outer surface cooperatively forms the helicla flute of full circle, closed helical raceway is formd, ball is rolled in the closed helical raceway.
Needle bearing is located on the bearing mounting surface between the inner surface of the middle housing and the outer surface of nut.
The nut is cylindrical shape.The inner surface of the nut is helical form half slot.The upper end port inner surface of the nut has the limited step of radially protruding, and the axially position to leading screw is realized by the inner surface of the limited step.External peripheral surface in the nut bottom has the toothed disc of radially protruding, and the circumferential surface of the toothed disc is engaged with electric motor speed reducer gear.The upper surface of the toothed disc forms the mounting surface of needle roller thrust bearing.
Leading screw is housing shape, in the installation locating surface of the leading screw upper end end face force sensor component.The external peripheral surface of the leading screw is also stepped, has helical form half slot in the leading screw upper outer circumferential surface, and length of the helical form half slot in leading screw axial direction is the 1/3 of the leading screw length.In the leading screw lower end, the inner surface close to end has the groove for being embedded in collar.
There is the upper support plate of radially protruding the upper end of the push rod, and push rod is fitted into leading screw endoporus, is slidably matched by the external peripheral surface and leading screw bore area of the support plate；There is cylindrical boss at the upper surface center of the support plate, boss upper surface is concave spherical surface, is contacted with force sensor module lower end umbilical point.There is axially projecting annular groove in the outer face of the lower support plate, the outer surface of the annular groove cell wall is flank, for installing heat insulating mattress.
The external diameter of the collar is identical with the internal diameter of the groove of the setting-in collar positioned at screw mandrel inner surface；The inner surface of collar coordinates with the mounting surface gap on the heat insulating mattress.Spring pad is laid in the upper surface of the collar.
The middle housing is cylindrical shape.Endoporus of housing is three-level shoulder hole in this, wherein, the internal diameter of middle housing central section is minimum, and has between nut installation gap；Internal diameter in the middle housing upper end is identical with the external diameter of needle bearing；The internal diameter of the middle lower housing portion is slightly larger than the external diameter of the nut teeth wheel disc, forms the installing space of nut teeth wheel disc.It is used to install on circumference at nut teeth wheel disc in the middle housing and has opening, for engages for nut teeth wheel disc and electric motor speed reducer gear.
The present invention is integrated with ball-screw by force snesor, and force snesor is located in the endoporus of ball-screw.The defect of the existing force snesor structure of electric brake actuator is solved, it is simple in construction, it is easy to accomplish.
Ball-screw component in the present invention is located in housing.Ball-screw component is engaged with electric motor speed reducer gear by gear.Nut inner surface and leading screw outer surface are threaded raceway respectively, ball circulating rolling in the closure raceway loop being made up of nut, leading screw during work.It is used to carry out radial positioning to ball-screw by needle bearing and deep groove ball bearing.Needle roller thrust bearing is used to bear reaction force produced during ball-screw work, transmits the force to actuator housing, and transfer force in the supporting construction of actuator by housing.The surface that lower house coordinates with leading screw is 12 side's endoporus, for being oriented to leading screw, and leading screw rotates during limitation ball-screw work.
Leading screw lower end bore design is that 12 sides at 12 square holes, with push rod lower end umbrella coordinate, and push rod is rotated when preventing from screwing on heat insulating mattress.Push rod bottommost be cylinder, in order to loss of weight by indoor design be hole.Cylindrical outer surface is screw thread, is coordinated with heat insulating mattress internal thread hole.Preloading spring is housed between heat insulating mattress and leading screw, plays a part of eliminating push rod and force sensor module installs gap.Preloading spring is by push rod fimbriatum upper limit, collar lower limit.Dynamic seal ring is housed inside lower house, piston seals when sliding.
Force sensor integrated in ball-screw endoporus, compared with existing force snesor is arranged between ball-screw and actuator housing, is saved axially mounted space by the present invention.After force snesor and ball-screw are integrated, directly power can be passed on force snesor by push rod structure, compared with domestic and international existing indirect measurement, reduce the loss of power transmittance process, improve measurement accuracy, the precision of Boeing 787 is about 4.25%, and domestic existing indirect measurement accuracy is about 1%, should the budget of invention measurement accuracy be 3 ‰.Power suffered by middle housing can be passed directly to the supporting construction being connected with middle housing, therefore the deflection meeting very little of middle housing, not interfere with centre-to-centre spacing positioning.And it is simple in construction, it is easy to implement.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the schematic diagram after actuator leading screw stretches out.
Fig. 3 is the enlarged diagram of piston base.
In figure：1. case top lid；2. nut；3. leading screw；4. data wire；5. ball；6. force sensor module；7. needle bearing；8. push rod；9. in housing；10. needle roller thrust bearing；11. deep groove ball bearing；12. lower house；13. dynamic seal ring；14. preloading spring；15. spring pad；16. collar；17. heat insulating mattress.
Embodiment
This example is a kind of electric brake actuator integrated by force snesor and ball-screw, including housing, ball-screw component, needle bearing 7, force sensor module 6, data wire 4, push rod 8, needle roller thrust bearing 10, deep groove ball bearing 11, preloading spring 14, spring pad 15, collar 16, dynamic seal ring 13 and heat insulating mattress 17.
Described housing includes middle housing 9, lower house 12 and case top lid 1, and ball-screw component is located in housing.The ball-screw component includes leading screw 3, nut 2 and ball 5.The top of the external peripheral surface of nut 2 in ball-screw component is coordinated by needle bearing 7 and middle shell inner surface；The inner surface for the upper hole wall at maximum diameter of hole that the upper surface of the toothed disc of the lower end external peripheral surface of nut 2 passes through needle roller thrust bearing 10 and middle housing 9 coordinates；The external peripheral surface of the lower end end of nut 2 is coordinated by the inner surface of deep groove ball bearing 11 and lower house 12.Push rod 8 is located in ball-screw component, and the lower end of the push rod is located in the central channel of heat insulating mattress 17, and upper end and the force sensor module of the push rod coordinate.Force sensor module is located at the upper end of leading screw endoporus, and the data wire of the force sensor module is connected through the data string hole inside the case top lid with the control unit of motor-driven cylinder.
The heat insulating mattress 17 is located at the lower end of ball-screw component, and the groove walls at the heat insulating mattress center is located in leading screw.Preloading spring 14 is installed between the groove walls outer surface at the heat insulating mattress center and the leading screw inner surface.
Helical form half slot is machined with respectively in the inner surface of nut 2 and the outer surface of leading screw 3, and it is identical with the radius of the helical form half slot on the outer surface of leading screw 3 to be located at the inner surface of nut 2 respectively, spiral angle is also identical, after the helical form half slot on the inner surface of nut 2 and the outer surface of leading screw 3 cooperatively forms the helicla flute of full circle, closed helical raceway is formd, ball 5 is rolled in the closed helical raceway.
Needle bearing 7 is located between the inner surface of the middle housing and the outer surface of nut, is installed on the bearing mounting surface of the nut upper end outer circumferential.
Engaged in the external peripheral surface of the toothed disc of the lower end external peripheral surface of nut 2 with the reduction gearing of actuator motor.
The nut is cylindrical shape.The inner surface of the nut is helical form half slot.The upper end port inner surface of the nut has the limited step of radially protruding, and the axially position to leading screw 3 is realized by the inner surface of the limited step.External peripheral surface in the nut bottom has the toothed disc of radially protruding, and the circumferential surface of the toothed disc is the flank of tooth, for being engaged with electric motor speed reducer gear.The upper surface of the toothed disc forms the mounting surface of needle roller thrust bearing 10.
Leading screw 3 is housing shape, and the endoporus of the leading screw is shoulder hole, and the installation locating surface of force sensor module is formd in the leading screw upper end end face.The external peripheral surface of the leading screw is also stepped, there is described helical form half slot in the leading screw upper outer circumferential surface, and length of the helical form half slot in leading screw axial direction is the 1/3 of the leading screw length.Without interference between the inner surface of part and nut of the leading screw external peripheral surface without helical form half slot.The lower end bore area of leading screw 3 is 12 square holes, coordinates with 12 sides of the lower end of push rod 8, is rotated with preventing from installing push rod 8 during heat insulating mattress 17.In the leading screw lower end, the inner surface close to end is fluted, for being embedded in collar 16.
There is the upper support plate of radially protruding the upper end of the push rod 8, and push rod 8 is fitted into the endoporus of leading screw 3, is slidably matched by the external peripheral surface and leading screw bore area of the support plate；There is cylindrical boss at the upper surface center of the support plate, boss upper surface is concave spherical surface, is contacted with force sensor module lower end umbilical point.Also there is the lower support plate of radially protruding the lower end of the push rod 8, and the outer surface of the lower support plate is 12 sides；There is axially projecting annular groove in the outer face of the lower support plate, the outer surface of the annular groove cell wall is flank, for installing heat insulating mattress 17.
The heat insulating mattress 17 is circular plate-like shape, has axially projecting mounting surface in the heat insulating mattress upper surface, is threadedly coupled heat insulating mattress with push rod by the mounting surface.
Preloading spring 14, and the lower surface by 8 times support plates of push rod and the axially position of collar 16 installed in the inner surface of leading screw 3 are housed between heat insulating mattress 17 and leading screw 3.Push rod 8 is eliminated by the preloading spring 14 and force sensor module 6 installs gap.
The collar 16 is the annular element of opening.The external diameter of collar is identical with the internal diameter of the groove of the setting-in collar positioned at leading screw inner surface；The inner surface of collar coordinates with the mounting surface gap on the heat insulating mattress 17.Spring pad 15 is laid in the upper surface of the collar, facilitates the installation of the preloading spring 14.
Sealed between the lower end of lower house 12 and leading screw by dynamic seal ring 13.
The middle housing 9 is cylindrical shape.Endoporus of housing 9 is three-level shoulder hole in this, wherein, the internal diameter at the middle part of middle housing 9 is minimum, and has between nut 2 installation gap；Internal diameter in the middle upper end of housing 9 is identical with the external diameter of needle bearing 7；The internal diameter of the bottom of middle housing 9 is slightly larger than the external diameter of the toothed disc of nut 2, forms the installing space of nut teeth wheel disc.It is used to install on circumference at nut teeth wheel disc in the middle housing 9 and has opening, for engages for nut teeth wheel disc and electric motor speed reducer gear.
Claims (7)
1. a kind of electric brake actuator integrated by force snesor and ball-screw, it is characterised in that it includes housing, ball-screw component, needle bearing, force sensor module, data wire, push rod, needle roller thrust bearing, deep groove ball bearing, preloading spring, spring pad, collar, dynamic seal ring and heat insulating mattress；
Described housing includes middle housing, lower house and case top lid, and ball-screw component is located in housing；The ball-screw component includes leading screw, nut and ball；The top of nut external peripheral surface in ball-screw component is coordinated by needle bearing and middle shell inner surface；The inner surface for the upper hole wall at maximum diameter of hole that the upper surface of the toothed disc of the nut lower end external peripheral surface passes through needle thrust bearing and middle housing coordinates；The external peripheral surface of the nut lower end end is coordinated by the inner surface of deep groove ball bearing and lower house；Push rod is located in ball-screw component；Force sensor module is located at the upper end of leading screw endoporus；
The heat insulating mattress is located at the lower end of ball-screw component, and the groove walls at the heat insulating mattress center is located in leading screw；Preloading spring is installed between the groove walls outer surface at the heat insulating mattress center and the leading screw inner surface；
Helical form half slot is machined with respectively in nut inner surface and leading screw outer surface, and it is identical with the radius of the helical form half slot on leading screw outer surface to be located at nut inner surface respectively, spiral angle is also identical, after the helical form half slot on nut inner surface and leading screw outer surface cooperatively forms the helicla flute of full circle, closed helical raceway is formd, ball is rolled in the closed helical raceway；
Needle bearing is located on the bearing mounting surface between the inner surface of the middle housing and the outer surface of nut.
2. as claimed in claim 1 by the integrated electric brake actuator of force snesor and ball-screw, it is characterised in that the nut is cylindrical shape；The inner surface of the nut is helical form half slot；The upper end port inner surface of the nut has the limited step of radially protruding, and the axially position to leading screw is realized by the inner surface of the limited step；External peripheral surface in the nut bottom has the toothed disc of radially protruding, and the circumferential surface of the toothed disc is engaged with electric motor speed reducer gear；The upper surface of the toothed disc forms the mounting surface of needle roller thrust bearing.
3. as claimed in claim 1 by the integrated electric brake actuator of force snesor and ball-screw, it is characterised in that leading screw is housing shape, in the installation locating surface of the leading screw upper end end face force sensor component；The external peripheral surface of the leading screw is also stepped, has helical form half slot in the leading screw upper outer circumferential surface, and length of the helical form half slot in leading screw axial direction is the 1/3 of the leading screw length；In the leading screw lower end, the inner surface close to end has the groove for being embedded in collar.
4. as claimed in claim 1 by the integrated electric brake actuator of force snesor and ball-screw, it is characterized in that, there is the upper support plate of radially protruding the upper end of the push rod, and push rod is fitted into leading screw endoporus, is slidably matched by the external peripheral surface and leading screw bore area of support plate on this；There is cylindrical boss at the upper surface center of support plate on described, and boss upper surface is concave spherical surface, is contacted with force sensor module lower end umbilical point；There is axially projecting annular groove in the outer face of lower support plate, the outer surface of the annular groove cell wall is flank, for installing heat insulating mattress.
5. as claimed in claim 1 by the integrated electric brake actuator of force snesor and ball-screw, it is characterised in that the external diameter of the collar is identical with the internal diameter of the groove of the setting-in collar positioned at screw mandrel inner surface；The inner surface of collar coordinates with the mounting surface gap on the heat insulating mattress；Spring pad is laid in the upper surface of the collar.
6. as claimed in claim 1 by the integrated electric brake actuator of force snesor and ball-screw, it is characterised in that the middle housing is cylindrical shape；Endoporus of housing is three-level shoulder hole in this, wherein, the internal diameter of middle housing central section is minimum, and has between nut installation gap；Internal diameter in the middle housing upper end is identical with the external diameter of needle bearing；The internal diameter of the middle lower housing portion is slightly larger than the external diameter of the nut teeth wheel disc, forms the installing space of nut teeth wheel disc；It is used to install on circumference at nut teeth wheel disc in the middle housing and has opening, for engages for nut teeth wheel disc and electric motor speed reducer gear.
7. as claimed in claim 1 by the integrated electric brake actuator of force snesor and ball-screw, it is characterised in that the lower end of the push rod is located in the central channel of heat insulating mattress, upper end and the force sensor module of the push rod coordinate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410653859.2A CN104443368B (en) | 2014-11-17 | 2014-11-17 | By the electric brake actuator that force snesor and ball-screw are integrated |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410653859.2A CN104443368B (en) | 2014-11-17 | 2014-11-17 | By the electric brake actuator that force snesor and ball-screw are integrated |
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| CN104443368A CN104443368A (en) | 2015-03-25 |
| CN104443368B true CN104443368B (en) | 2016-06-29 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105697619B (en) * | 2016-03-16 | 2017-12-12 | 西安航空制动科技有限公司 | Piston component in electric brake actuator |
| CN108760107A (en) * | 2018-05-07 | 2018-11-06 | 西安航空制动科技有限公司 | A kind of force snesor in electric brake actuator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103661345A (en) * | 2013-12-05 | 2014-03-26 | 西安航空制动科技有限公司 | Actuator of airplane electric braking device |
| CN103711819A (en) * | 2013-12-05 | 2014-04-09 | 西安航空制动科技有限公司 | Electric brake actuator comprising signal conditioning module |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050269872A1 (en) * | 2004-06-04 | 2005-12-08 | Mihai Ralea | Electric brake position and force sensing and control |
| US7565953B2 (en) * | 2006-05-11 | 2009-07-28 | Meggitt Aircraft Braking Systems | Brake force transducer for electric brakes |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103661345A (en) * | 2013-12-05 | 2014-03-26 | 西安航空制动科技有限公司 | Actuator of airplane electric braking device |
| CN103711819A (en) * | 2013-12-05 | 2014-04-09 | 西安航空制动科技有限公司 | Electric brake actuator comprising signal conditioning module |
Non-Patent Citations (1)
| Title |
|---|
| 飞机全电刹车系统的机电作动机构;丁斌 等;《航空制造技术》;20060131(第1期);第36-39页 * |
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