CN105697619A - Piston assembly in electric braking actuator - Google Patents
Piston assembly in electric braking actuator Download PDFInfo
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- CN105697619A CN105697619A CN201610149431.3A CN201610149431A CN105697619A CN 105697619 A CN105697619 A CN 105697619A CN 201610149431 A CN201610149431 A CN 201610149431A CN 105697619 A CN105697619 A CN 105697619A
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- Prior art keywords
- piston cylinder
- ball
- lubrication
- screw
- keeps
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
- F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C25/00—Alighting gear
- B64C25/32—Alighting gear characterised by elements which contact the ground or similar surface
- B64C25/42—Arrangement or adaptation of brakes
- B64C25/44—Actuating mechanisms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/02—Fluid pressure
- F16D2121/04—Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
- F16D2121/24—Electric or magnetic using motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2123/00—Multiple operation forces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/02—Fluid-pressure mechanisms
- F16D2125/08—Seals, e.g. piston seals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/18—Mechanical mechanisms
- F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
- F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
- F16D2125/40—Screw-and-nut
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/18—Mechanical mechanisms
- F16D2125/44—Mechanical mechanisms transmitting rotation
- F16D2125/46—Rotating members in mutual engagement
- F16D2125/48—Rotating members in mutual engagement with parallel stationary axes, e.g. spur gears
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2127/00—Auxiliary mechanisms
- F16D2127/06—Locking mechanisms, e.g. acting on actuators, on release mechanisms or on force transmission mechanisms
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The invention relates to a piston assembly in an electric braking actuator. One end of a ball screw is arranged into a lubrication maintaining cover, so that a rack wheel located at the top of the ball screw is mounted on the upper end face of a matched actuator housing through a needle roller thrust bearing, a thrust roller bearing and a radial needle roller bearing; the rack wheel is engaged with a reduction gear of the electric braking actuator so as to receive an input torque, a ball screw nut is mounted on the ball screw in a sleeving manner, and a piston cylinder is mounted on the lubrication maintaining cover and the ball screw nut in a sleeving manner; and a supporting sealing ring is mounted between the inner circumferential surface of the piston cylinder and the outer surface of inner circle of the lubrication maintaining cover, the bottom end of the lubrication maintaining cover is placed in a groove in the center of an insulating pad, and the bottom end of the piston cylinder is placed on the upper surface of the insulating pad. The piston assembly provided by the invention has the characteristic of long working life.
Description
Technical field
The present invention relates to aircraft brake field, specifically the piston component in a kind of electric brake actuator。
Background technology
Electric brake is a kind of new technique beginning at and applying in aircraft brake。Actuator is to perform the functional unit of braking action in electric brake。Actuator is mainly made up of electric machine assembly, reduction gearing, piston component and force transducer etc.。Piston component is the functional part that the torque that reduction gearing exports converts in actuator the output of braking action power。In electric brake actuator, piston component is mainly made up of ball-screw, spring bearing, heat insulating mattress etc.。Piston component in electric brake actuator can be divided into two classes by the difference according to ball-screw occupation mode, and a kind of structure type being nut and driving ball-screw, another kind of ball-screw drives the structure type of nut。Two kinds of structures are respectively arranged with quality。Ball-screw being driven to the structure of nut, it is described by existing multiple patents at present。Such as patent WO2005/001303A2, patent US20090109565A1, patent US7565953 etc.。In these structures, the nut of ball-screw is piston cylinder, and the two is same part。Piston cylinder head has a heat insulating mattress, directly contacts with brake disc during brake。This piston assembly structure will be directly exposed under actuator external environment condition at the outer surface of the protruding back nut of piston cylinder。Piston cylinder in use can experience high temperature, humidity and contact various corrosion dust。These conditions require that this part of piston cylinder allows for tolerance higher temperature and has good corrosion resistance characteristic。And as the driving parts in piston component, nut requires high intensity, high tenacity and good anti-wear performance。If directly the nut of ball-screw being used as piston cylinder, the combination property of part material is required significantly high, now widely used ball-screw material (such as bearing steel Gr15, nitrided steel 38CrMoAlA etc.) is not provided simultaneously with such combination property, it is necessary to research and develop new material to meet this use occasion requirement。This will increase research and development and the use cost of actuator。
Drive in the piston assembly structure of nut at above ball-screw, all employ radial ball bearing and ball-screw is supported location。In brake, piston component directly contacts with brake disc, and when braking action power is bigger, the deformation due to other parts of brake gear will cause that piston component bears bigger side force。This side force will be delivered on the housing of actuator eventually through spring bearing。Owing to radial ball bearing can not bear bigger side force, this service condition can cause damage of the bearing, reduces the start performance of actuator。
Drive in the piston assembly structure of nut at above ball-screw, all adopt grease that ball-screw is lubricated。The operating position of ball-screw changes along with the abrasion of brake disc, the more big ball-screw that weares and teares stretches out more many, when brake disc may wear to the longevity, the nut of ball-screw extend out to about the maximum position of its stroke, and when more renewing brake disc, the nut of ball-screw must be retracted to again initial position。So along with brake disc abrasion and replacing, the operating position of nut changes back and forth。Nut can drive grease to move relative to the straight reciprocating motion of ball-screw, owing to the maximum position place of stroke does not have grease to keep structure, the reciprocating motion of nut can make a part of grease forever depart from the raceway of ball-screw, cause ball-screw insufficient lubrication, affect the working life of ball-screw。Otherwise regularly ball-screw must be lubricated maintenance, increase the maintenance workload of user, increase the use cost of actuator。
In the piston assembly structure of above structure, during ball-screw work, nut moves back and forth on ball-screw, there is ball-screw and crosses the possibility of stroke motion。When nut extends over the maximum travel position of ball-screw, causing that ball departs from raceway, ball-screw lost efficacy。Owing to ball-screw having gear, when nut is retracted excessive, the gear structure caused on nut and ball-screw being produced movement interference, thus causing ball-screw clamping stagnation, losing driving force。
In the piston assembly structure of above structure, nut moves back and forth and directly will contact with actuator housing。Owing to nut and actuator housing are all metal structures, during two kinds of metal material phase mutual friction, there is bigger frictional force, piston component premature abrasion can be caused, be unfavorable for improving the working life of actuator。
Summary of the invention
Having bigger frictional force during for overcoming the two kinds of metal material phase mutual friction existed in prior art, reduce the deficiency of actuator working life, the present invention proposes the piston component in a kind of electric brake actuator。
The present invention includes ball-screw, ball-screw nut, piston cylinder, lubrication maintenance set, supports sealing ring, needle roller thrust bearing, thrust roller bearing, radial needle roller bearing。One end of described ball-screw loads lubrication and keeps in set, and makes the gear wheel being positioned at this ball-screw top be arranged on the upper surface of actuator housing joined together by needle roller thrust bearing, thrust roller bearing and radial needle roller bearing；Described gear wheel is meshed with the reduction gearing of electric brake actuator, to accept the torque of input。Ball-screw nut is sleeved on described ball-screw, and is positioned at the top of this ball-screw。Piston cylinder is sleeved on described lubrication and keeps on set and ball-screw nut, and makes described lubrication keep in the positioning table that the top of set embeds this piston cylinder inner surface；Inner circumferential surface and described lubrication at described piston cylinder keep being provided with support sealing ring between the outer internal circular surfaces overlapped。Described lubrication keeps the bottom of set to be placed in the groove at heat insulating mattress center；The bottom of described piston cylinder is placed in the upper surface of heat insulating mattress。
The circumferential surface of the gear wheel on ball-screw top is the flank of tooth that the reduction gearing with electric brake actuator is meshed。There is the central recess coordinated with actuator lid at the center of described gear wheel upper surface, have the seam of ring-type in this central recess cell wall upper inner, be used for bearing collar is installed。Periphery at described central recess has the bearing mounting groove of ring-type。
Having axially projecting annular boss at the lower surface outer rim place of described gear wheel, the ladder difference between this boss and gear wheel lower surface defines the installed surface of needle roller thrust bearing。Dynamic coordinated by what this needle roller thrust bearing realized between ball-screw and actuator housing upper surface joined together。
External peripheral surface in described ball-screw lower end is fluted, realizes this ball-screw by the sealing ring being arranged in this groove and keeps the sealing between set to coordinate with lubrication。The bottom outer round surface processing of described ball-screw has spiral rolling track, when ball-screw works for the circulation of ball。
The internal diameter of described piston cylinder is identical with the external diameter of ball-screw nut, and the external diameter of piston cylinder is slightly less than the internal diameter of actuator housing joined together, to ensure that piston cylinder directly will not contact with described actuator housing。The positioning table of radially protruding is had on described piston cylinder inner surface top；The internal diameter at this positioning table place is identical with the internal diameter of ball-screw nut。In described positioning table outer end, lower surface is stepped, defines lubrication and keeps the draw-in groove of set, and the lubrication after assembling keeps the top of set to be inlaid in this draw-in groove。The mounting groove of ball-screw nut collar is had at described piston cylinder upper end inner surface。The distance between ball-screw nut collar lower surface after described positioning table upper surface and installation is equal to the axial length of ball-screw nut。
Described piston cylinder lower end inner surface has the screw thread coordinated with heat insulating mattress。The internal diameter of this thread segment is less than the internal diameter of this piston cylinder barrel, and cambered surface transition between the difference in internal diameters of thread segment and piston cylinder barrel。Have two fuse hole arranged side by side in described piston cylinder lower end, this fuse hole aperture in piston cylinder is positioned in described cambered surface, and the aperture outside piston cylinder is positioned at this piston cylinder barrel external peripheral surface。Described piston cylinder upper end outer surface has the mounting groove of half guide collar。
The upper surface of described heat insulating mattress is by groove；This groove notch place internal diameter keeps the external diameter overlapped identical with lubrication。The external peripheral surface of described dividing plate is flank。Outer rim at described heat insulating mattress upper surface has ring-type journal stirrup；Circumference at this journal stirrup is evenly equipped with six groups of fuse hole, often group two。
Described half guide collar has two, is semi-annular shape。The two ends of described half and half guide collar have dop respectively, and make the dop of this half guide collar be positioned at two gathering sills on described actuator housing, to limit circumferentially rotating of piston cylinder。
The upper surface of set is kept to have 2 positioning boss protruding this end face in described lubrication, and what described 2 positioning boss were symmetrical is distributed in the upper surface that described lubrication keeps overlapping, and keeping the card slot fit of set with the lubrication on the positioning table of piston cylinder inner surface respectively, it is prevented that lubrication maintenance is enclosed within piston cylinder and rotates。Lubrication keeps the middle part of set to be supported by the support sealing ring being arranged in piston cylinder, and keeps the periphery of set to seal lubrication。Described lubrication keeps the external peripheral surface of set lower end to have the boss of ring-type, keeps set to be supported on the upper surface of heat insulating mattress lubrication by this boss, keeps the axial location of set with the positioning table restriction lubrication by this boss with piston cylinder inner surface。
The present invention adopts the combined support of radial needle roller bearing+needle roller thrust bearing+thrust roller bearing, and the spring bearing working life making ball-screw is longer。Ball-screw is supported by needle roller thrust bearing, thrust roller bearing and radial needle roller bearing。Wherein, needle roller thrust bearing and thrust roller bearing are set in gear wheel above and below。Their effect is subject to produced forward axial force and reverse axial force during ball-screw work respectively。The upper end processing of ball-screw has endoporus, and radial needle roller bearing is arranged in this endoporus, and is fixed by collar。The effect of radial needle roller bearing is subject to produced radial force during ball-screw work。
Nut adopts different materials to be possible not only to improve the Corrosion Protection of piston cylinder with piston cylinder, and can reduce the use temperature of nut。After during brake, heat insulating mattress contacts with brake disc, the heat on brake disc will be conducted to nut by heat insulating mattress and piston cylinder。Comparing for TC11 titanium alloy material and Gr15 material, the thermal conductivity of TC11 material is about 1/4th of Gr15 material。If piston cylinder adopts Gr15 material, the maximum temperature of nut will more than 200 DEG C。If piston cylinder adopts TC11 material, then the maximum temperature of nut can be down to less than 150 DEG C。
Reliable in order to ensure the connection between nut and piston cylinder, it is prevented that the slip of circumference occurs between them, adopt inside and outside circle interference fit to connect。Collar is arranged on the endoporus top of piston cylinder, it is possible to prevent nut axial float in piston cylinder。
The present invention is provided with sealing ring in the lower end of ball-screw。Sealing ring remains with the inner headed face of lubrication maintenance set and contacts, make grease remain at ball screw spiral raceway and lubrication keeps in the cavity volume that set inner headed face forms, grease will not be taken away from the lower surface of ball-screw, thus extending the service life of actuator。
The present invention is limited when nut stretches out by the positive stop lug boss on piston cylinder and goes beyond the limit of position；Position is gone beyond the limit of when limiting nut retraction by the confined planes on heat insulating mattress。Spacing by both direction, it is ensured that stroke motion operationally will not occur ball-screw, it is to avoid cross stroke and the ball that causes departs from raceway and clamping stagnation, without departing from its stroke limit position when making nut back and forth run。
The piston cylinder of piston component is designed as independent part by the present invention, and uses the materials processing with high temperature resistant, low heat conductivity and good corrosion to form, it is possible to effectively reduce the operating temperature of nut during brake and nut is carried out anti-corrosion protection。
Accompanying drawing explanation
Fig. 1 is the sectional view of piston component；
Fig. 2 is the structural representation of piston cylinder；
Fig. 3 is the structural representation that lubrication keeps set；
Fig. 4 is half guide collar scheme of installation on piston cylinder；
Fig. 5 is the gathering sill schematic diagram in actuator housing；
Fig. 6 is the schematic diagram of heat insulating mattress；
Fig. 7 is the schematic diagram that piston component reaches lower limit position
Fig. 8 is the schematic diagram that piston component retracts to upper extreme position。In figure:
1. ball-screw；2. ball-screw nut；3. piston cylinder；4. lubrication keeps set；5. heat insulating mattress；6. ball-screw nut collar；7. half guide collar；8. support sealing ring；9. guide collar；10. sealing ring；11. sealing ring；12. needle roller thrust bearing；13. thrust roller bearing；14. radial needle roller bearing；15. bearing collar；16. actuator lid；17. actuator housing。
Detailed description of the invention
The present embodiment is the piston component in a kind of electric brake actuator, is mainly kept set 4, heat insulating mattress 5, ball-screw nut collar 6, guide collar 7, support sealing ring 8, guide collar 9, sealing ring 10, sealing ring 11, needle roller thrust bearing 12, thrust roller bearing 13, radial needle roller bearing 14 and bearing collar 15 to form by ball-screw 1, ball-screw nut 2, piston cylinder 3, lubrication。
One end of described ball-screw 1 loads lubrication and keeps in set 4, and makes the gear wheel being positioned at this ball-screw top be arranged on the upper surface of actuator housing 17 by needle roller thrust bearing 12；Described gear wheel is meshed with the reduction gearing of electric brake actuator, to accept the torque of input。Ball-screw nut 2 is sleeved on described ball-screw, and is positioned at the top of this ball-screw。Piston cylinder 3 is sleeved on described lubrication and keeps on set 4 and ball-screw nut 2, and makes described lubrication keep in the positioning table that the top of set embeds this piston cylinder inner surface；Inner circumferential surface and described lubrication at described piston cylinder keep being provided with support sealing ring 8 between the outer internal circular surfaces overlapped。Described lubrication keeps the bottom of set 4 to be placed in the groove at heat insulating mattress 5 center；The bottom of described piston cylinder 3 is placed in the upper surface of heat insulating mattress 5。
The circumferential surface of the gear wheel on described ball-screw 1 top is the flank of tooth that the reduction gearing with electric brake actuator is meshed。There is the central recess coordinated with actuator lid 16 at the center of described gear wheel upper surface, have the seam of ring-type in this central recess cell wall upper inner, be used for bearing collar 15 is installed。Periphery at described central recess has the bearing mounting groove of ring-type。During assembling: actuator lid is arranged in this central recess；Radial needle roller bearing 14 is installed between described actuator lid and central recess cell wall, and is realized the location of this radial needle roller bearing by bearing collar 15。Thrust roller bearing 13 is inlaid in described bearing mounting groove。
Having axially projecting annular boss at the lower surface outer rim place of described gear wheel, the ladder difference between this boss and gear wheel lower surface defines the installed surface of needle roller thrust bearing 12。Dynamic coordinated by what this needle roller thrust bearing realized between ball-screw 1 with actuator housing 17 upper surface。
External peripheral surface in described ball-screw 1 lower end is fluted, realizes this ball-screw by the sealing ring 11 being arranged in this groove and keeps the sealing between set 4 to coordinate with lubrication。
The bottom outer round surface processing of described ball-screw 1 has spiral rolling track, when ball-screw works for the circulation of ball。
Described ball-screw and ball-screw nut adopt conventional ball screw arrangement materials processing to form, as bearing steel Gr15, nitrided steel 38CrMoAlA process。
Described piston cylinder 3 is thin-wall case, and internal diameter is identical with the external diameter of ball-screw nut, and its external diameter is slightly less than the internal diameter of actuator 17, to ensure that piston cylinder directly will not contact with actuator housing。The positioning table of radially protruding is had on described piston cylinder inner surface top；The internal diameter at this positioning table place is identical with the internal diameter of ball-screw nut。In described positioning table outer end, lower surface is stepped, defines lubrication and keeps the draw-in groove of set 4, and the lubrication after assembling keeps the top of set to be inlaid in this draw-in groove。The mounting groove of ball-screw nut collar 6 is had at described piston cylinder upper end inner surface。The distance between ball-screw nut collar lower surface after described positioning table upper surface and installation is equal to the axial length of ball-screw nut。
Inner surface at described piston cylinder has the sealing ring draw-in groove of radially protruding, is used for installing support sealing ring 8。Described sealing ring draw-in groove is positioned at the lower section of described positioning table。
Described piston cylinder lower end inner surface has the screw thread coordinated with heat insulating mattress。The internal diameter of this thread segment is less than the internal diameter of this piston cylinder barrel, and cambered surface transition between the difference in internal diameters of thread segment and piston cylinder barrel。Have two fuse hole arranged side by side in described piston cylinder lower end, this fuse hole aperture in piston cylinder is positioned in described cambered surface, and the aperture outside piston cylinder is positioned at this piston cylinder barrel external peripheral surface。
Described piston cylinder upper end outer surface has the mounting groove of half guide collar 7。
Described piston cylinder 2 adopts high-low temperature resistant, low heat conductivity and corrosion resistant metal material processing to form, to adapt to high/low temperature and corrosion working environment。In the present embodiment, described piston cylinder adopts titanium alloy to make。
Described heat insulating mattress 5 adopts titanium alloy to make。The upper surface of this heat insulating mattress has the dividing plate of axially projecting ring-type, has been centrally formed the groove of circle at heat insulating mattress upper surface；The internal diameter at this groove notch place is minimum, identical with the external diameter that lubrication keeps set 4。The external peripheral surface of described dividing plate is flank。Outer rim at described heat insulating mattress upper surface has ring-type journal stirrup；Circumference at this journal stirrup is evenly equipped with six groups of fuse hole, often group two。
During assembling, first by fuse threading in the fuse hole of piston cylinder 3, again by heat insulating mattress 5 by being threadably mounted at the lower end of piston cylinder 3, then by electric fuse from heat insulating mattress 5 from nearest that group fuse hole of electric fuse through and tighten, so realize the locking of connection screw thread by locking electric fuse。Excessive position between heat insulating mattress 5 upper journal and upper surface is because being thin-wall construction, so rigidity is more weak, when journal stirrup contacts with actuator housing lower surface, this thin-wall construction can produce a small amount of deformation, and this deformation can absorb certain impact energy。
Described half guide collar 7 has two, is semi-annular shape, adopts wear-resisting and that coefficient of friction is little process for un-metal material to form。The width of the mounting groove of the width of described guide collar and piston cylinder upper end outer surface adapts, and internal diameter is identical with the external diameter of this mounting groove, makes the inner headed face of the later half guide collar of installation 7 be embedded in the mounting groove on described piston cylinder。The two ends of described half and half guide collar have dop respectively。Half guide collar 7 matches with actuator housing 17 after installing。The processing symmetrical in actuator shell inner surface has two gathering sills；After piston component is arranged in actuator housing, the external peripheral surface of half guide collar 7 coordinates with the inner surface of actuator housing, and makes the dop of half guide collar 7 be positioned at said two gathering sill, to limit circumferentially rotating of piston cylinder。
Guide collar 9 and sealing ring 10 are installed in the bottom of actuator housing 17。Piston cylinder 3 is carried out axially directed by guide collar 9 and half guide collar 7 jointly, to reduce the frictional force between actuator housing and piston cylinder, and comes in contact when preventing piston cylinder from working and between actuator housing。The effect of sealing ring 10 is that the periphery to piston cylinder seals, it is prevented that foreign object enters and prevents grease from flowing out actuator。
Described lubrication keeps set 4 be the Circular Thin housing of lower end closed, adopts high-low temperature resistant, low heat conductivity, coefficient of friction is little and has the nonmetallic materials of some strength to make, and in the present embodiment, this lubrication keeps the material overlapped to be polyimides。The upper surface of set 4 is kept to have 2 positioning boss protruding this end face in described lubrication, and what described 2 positioning boss were symmetrical is distributed in the upper surface that described lubrication keeps overlapping, and keeping the card slot fit of set with the lubrication on the positioning table of piston cylinder 3 inner surface respectively, it is prevented that lubrication keeps set 4 to rotate in piston cylinder 3。Lubrication keeps the middle part of set 4 to be supported by the support sealing ring 8 being arranged in piston cylinder 3, and keeps the periphery of set 4 to seal lubrication。Described lubrication keeps the external peripheral surface of set 4 lower ends to have the boss of ring-type, keeps set to be supported on the upper surface of heat insulating mattress 5 lubrication by this boss, keeps the axial location of set with the positioning table restriction lubrication by this boss with piston cylinder 3 inner surface。
The work process of the present embodiment is: when ball-screw rotates forward, and nut stretches out under the driving of ball-screw together with piston cylinder 3, and due to the cooperation restriction of gathering sill on half guide collar 7 and actuator housing 17, nut can only do straight line and stretch out motion。Generally piston cylinder extend out to after heat insulating mattress 5 contacts with brake disc and produce required braking action power, and nut is with regard to stop motion。Under special circumstances, during as being fitted without brake disc on brake gear, piston cylinder does and stretches out motion, until the small boss end contact on piston cylinder 3 is to the bottom of actuator housing 17 gathering sill。Piston cylinder 3 is stretched out position limitation protection by the bottom of gathering sill, it is ensured that nut 2 and piston cylinder 3 will not excessively stretch out, it is to avoid the spin of ball-screw departs from raceway because of nut overtravel, and this situation is as shown in Figure 7。When ball-screw reversely rotates, nut bounces back under the driving of ball-screw together with piston cylinder 3, due to half guide collar 7 with on actuator housing 17 gathering sill coordinate restriction, nut can only do rectilinear motion retracting motion。The generally control of controlled device, bounces back stopping after piston cylinder retraction certain distance。But under special circumstances, time as abnormal in control device hardware fault or software work, piston cylinder will do retracting motion, until the journal stirrup of heat insulating mattress 5 touches the lower surface of actuator housing 17 always。Piston cylinder 3 is carried out retraction position limitation protection by the journal stirrup position of heat insulating mattress 5, it is ensured that nut 2 and piston cylinder 3 will not overtravel bounce back, it is to avoid because the axially-movable between nut 2 and ball-screw 1 that overtravel retraction may result in is interfered。This situation is as shown in Figure 8。
Claims (8)
1. the piston component in an electric brake actuator, it is characterised in that include ball-screw, ball-screw nut, piston cylinder, lubrication maintenance set, support sealing ring, needle roller thrust bearing, thrust roller bearing, radial needle roller bearing；One end of described ball-screw loads lubrication and keeps in set, and makes the gear wheel being positioned at this ball-screw top be arranged on the upper surface of actuator housing joined together by needle roller thrust bearing, thrust roller bearing and radial needle roller bearing；Described gear wheel is meshed with the reduction gearing of electric brake actuator, to accept the torque of input；Ball-screw nut is sleeved on described ball-screw, and is positioned at the top of this ball-screw；Piston cylinder is sleeved on described lubrication and keeps on set and ball-screw nut, and makes described lubrication keep in the positioning table that the top of set embeds this piston cylinder inner surface；Inner circumferential surface and described lubrication at described piston cylinder keep being provided with support sealing ring between the outer internal circular surfaces overlapped；Described lubrication keeps the bottom of set to be placed in the groove at heat insulating mattress center；The bottom of described piston cylinder is placed in the upper surface of heat insulating mattress。
2. the piston component in electric brake actuator as claimed in claim 1, it is characterised in that the circumferential surface of the gear wheel on ball-screw top is the flank of tooth that the reduction gearing with electric brake actuator is meshed；There is the central recess coordinated with actuator lid at the center of described gear wheel upper surface, have the seam of ring-type in this central recess cell wall upper inner, be used for bearing collar is installed；Periphery at described central recess has the bearing mounting groove of ring-type；
Having axially projecting annular boss at the lower surface outer rim place of described gear wheel, the ladder difference between this boss and gear wheel lower surface defines the installed surface of needle roller thrust bearing；Dynamic coordinated by what this needle roller thrust bearing realized between ball-screw and actuator housing upper surface joined together。
3. the piston component in electric brake actuator as claimed in claim 1, it is characterised in that the external peripheral surface in described ball-screw lower end is fluted, realizes this ball-screw by the sealing ring being arranged in this groove and keeps the sealing between set to coordinate with lubrication；The bottom outer round surface processing of described ball-screw has spiral rolling track, when ball-screw works for the circulation of ball。
4. the piston component in electric brake actuator as claimed in claim 1, it is characterized in that, the internal diameter of described piston cylinder is identical with the external diameter of ball-screw nut, and the external diameter of piston cylinder is slightly less than the internal diameter of actuator housing joined together, to ensure that piston cylinder directly will not contact with described actuator housing；The positioning table of radially protruding is had on described piston cylinder inner surface top；The internal diameter at this positioning table place is identical with the internal diameter of ball-screw nut；In described positioning table outer end, lower surface is stepped, defines lubrication and keeps the draw-in groove of set, and the lubrication after assembling keeps the top of set to be inlaid in this draw-in groove；The mounting groove of ball-screw nut collar is had at described piston cylinder upper end inner surface；The distance between ball-screw nut collar lower surface after described positioning table upper surface and installation is equal to the axial length of ball-screw nut。
5. the piston component in electric brake actuator as claimed in claim 1, it is characterised in that described piston cylinder lower end inner surface has the screw thread coordinated with heat insulating mattress；The internal diameter of this thread segment is less than the internal diameter of this piston cylinder barrel, and cambered surface transition between the difference in internal diameters of thread segment and piston cylinder barrel；Have two fuse hole arranged side by side in described piston cylinder lower end, this fuse hole aperture in piston cylinder is positioned in described cambered surface, and the aperture outside piston cylinder is positioned at this piston cylinder barrel external peripheral surface；Described piston cylinder upper end outer surface has the mounting groove of half guide collar。
6. the piston component in electric brake actuator as claimed in claim 1, it is characterised in that the upper surface of described heat insulating mattress is by groove；This groove notch place internal diameter keeps the external diameter overlapped identical with lubrication；The external peripheral surface of described dividing plate is flank；Outer rim at described heat insulating mattress upper surface has ring-type journal stirrup；Circumference at this journal stirrup is evenly equipped with six groups of fuse hole, often group two。
7. the piston component in electric brake actuator as claimed in claim 1, it is characterised in that described half guide collar has two, is semi-annular shape；The two ends of described half and half guide collar have dop respectively, and make the dop of this half guide collar be positioned at two gathering sills on described actuator housing, to limit circumferentially rotating of piston cylinder。
8. the piston component in electric brake actuator as claimed in claim 1, it is characterized in that, the upper surface of set is kept to have 2 positioning boss protruding this end face in described lubrication, and what described 2 positioning boss were symmetrical is distributed in the upper surface that described lubrication keeps overlapping, and keeping the card slot fit of set with the lubrication on the positioning table of piston cylinder inner surface respectively, it is prevented that lubrication maintenance is enclosed within piston cylinder and rotates；Lubrication keeps the middle part of set to be supported by the support sealing ring being arranged in piston cylinder, and keeps the periphery of set to seal lubrication；Described lubrication keeps the external peripheral surface of set lower end to have the boss of ring-type, keeps set to be supported on the upper surface of heat insulating mattress lubrication by this boss, keeps the axial location of set with the positioning table restriction lubrication by this boss with piston cylinder inner surface。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610149431.3A CN105697619B (en) | 2016-03-16 | 2016-03-16 | Piston component in electric brake actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610149431.3A CN105697619B (en) | 2016-03-16 | 2016-03-16 | Piston component in electric brake actuator |
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| CN105697619A true CN105697619A (en) | 2016-06-22 |
| CN105697619B CN105697619B (en) | 2017-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610149431.3A Active CN105697619B (en) | 2016-03-16 | 2016-03-16 | Piston component in electric brake actuator |
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| 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 |
| CN109896044A (en) * | 2019-04-04 | 2019-06-18 | 西安航空制动科技有限公司 | A kind of piston reset device for aircraft brake wheel |
| CN111137094A (en) * | 2018-11-06 | 2020-05-12 | 舍弗勒技术股份两合公司 | Device for leveling a vehicle body |
| CN112682441A (en) * | 2020-12-25 | 2021-04-20 | 中国航天空气动力技术研究院 | Dual-redundancy actuator of electric brake device |
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|---|---|
| CN105697619B (en) | 2017-12-12 |
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