CN105697619B - Piston component in electric brake actuator - Google Patents
Piston component in electric brake actuator Download PDFInfo
- Publication number
- CN105697619B CN105697619B CN201610149431.3A CN201610149431A CN105697619B CN 105697619 B CN105697619 B CN 105697619B CN 201610149431 A CN201610149431 A CN 201610149431A CN 105697619 B CN105697619 B CN 105697619B
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- Prior art keywords
- ball
- screw
- lubrication
- piston cylinder
- piston
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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
-
- 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
A kind of piston component in electric brake actuator, one end of ball-screw loads lubrication and kept in set, and the gear wheel positioned at the ball-screw top is arranged on the upper surface of actuator housing joined together by needle roller thrust bearing, thrust roller bearing and radial needle roller bearing；Gear wheel is meshed with the reduction gearing of electric brake actuator, to receive the torque of input.Ball-screw nut is sleeved on ball-screw.Piston cylinder is sleeved on lubrication and kept on set and ball-screw nut；In the inner circumferential surface and lubrication of piston cylinder keep that support sealing ring is installed between the outer internal circular surfaces of set.Lubrication keeps the bottom of set to be placed in the groove at heat insulating mattress center；The bottom of piston cylinder is placed in the upper surface of heat insulating mattress.The present invention has the characteristics of long working life.
Description
Technical field
The present invention relates to aircraft brake field, the piston component in specifically a kind of electric brake actuator.
Background technology
Electric brake is a kind of new technology for starting to apply in aircraft brake.Actuator is that braking action is performed in electric brake
Functional unit.Actuator is mainly made up of electric machine assembly, reduction gearing, piston component and force snesor etc..Piston component is
The torque of reduction gearing output is converted to the functional part of braking action power output in actuator.It is living in electric brake actuator
Plug assembly is mainly made up of ball-screw, spring bearing, heat insulating mattress etc..Electricity can be stopped according to the difference of ball-screw occupation mode
Piston component in car actuator is divided into two classes, and a kind of is the structure type of nut driving ball-screw, another ball-screw
The structure type of drive nut.Two kinds of structures respectively have quality.It is existing at present more for the structure of ball-screw drive nut
It is described individual patent.Such as patent WO2005/001303 A2, patent US20090109565 A1, patent
US7565953 etc..In these structures, the nut of ball-screw is piston cylinder, and the two is same part.Piston cylinder head
There is a heat insulating mattress, directly contacted with brake disc during brake.This piston assembly structure is in the protruding back nut of piston cylinder
Outer surface will be directly exposed under actuator external environment condition.Piston cylinder can undergo high temperature, humidity and the various corruption of contact in use
Lose dust.These conditions require that this part of piston cylinder allows for being resistant to higher temperature and has good corrosion resistance characteristic.
And as the driving parts in piston component for, nut requires high intensity, high tenacity and good anti-wear performance.If directly will
The nut of ball-screw is used as piston cylinder, and very high, now widely used ball is required to the combination property of part material
Leading screw material be not provided simultaneously with (such as bearing steel Gr15, nitrided steel 38CrMoAlA etc.) combination property, it is necessary to research and development are new
Material meet this use occasion requirement.This will increase research and development and the use cost of actuator.
In the piston assembly structure of above ball-screw drive nut, it all employ radial ball bearing and ball-screw entered
Row support positioning.Piston component directly contacts with brake disc in brake, when braking action power is larger due to brake gear its
The deformation of its part will cause piston component to bear larger side force.This side force will be delivered to work eventually through spring bearing
On the housing of dynamic device.Because radial ball bearing can not bear larger side force, this service condition can cause damage of the bearing, drop
The start performance of low actuator.
In the piston assembly structure of above ball-screw drive nut, all ball-screw is moistened using lubricating grease
It is sliding.The operating position of ball-screw changes with the abrasion of brake disc, wears bigger ball-screw and stretches out more, brake mill
The nut damaged to ball-screw during the longevity extend out to maximum position of its stroke or so, the spiral shell of ball-screw when more renewing brake disc
It is female and initial position must be retracted to.So as brake mill damage and replacing, the operating position of nut change back and forth.Nut phase
Straight reciprocating motion for ball-screw can drive lubricating grease to move, due to not having lubricating grease holding at the maximum position of stroke
Structure, the reciprocating motion of nut can make a part of lubricating grease forever depart from the raceway of ball-screw, cause ball-screw lubrication not
It is good, influence the working life of ball-screw.Otherwise maintenance must be periodically lubricated to ball-screw, increases the maintenance of user
Workload, increase the use cost of actuator.
In the piston assembly structure of above structure, when ball-screw works, nut moves back and forth on ball-screw, deposits
In the possibility of ball-screw overtravel motion.When nut extends over the maximum travel position of ball-screw, can cause to roll
Pearl departs from raceway, ball-screw failure.Due to having gear on ball-screw, nut and ball will be caused when nut retraction is excessive
Gear structure on leading screw produces movement interference, so as to cause ball-screw clamping stagnation, loses driving force.
In the piston assembly structure of above structure, nut is moved back and forth and will directly contacted with actuator housing.Due to spiral shell
Female and actuator housing is all metal structure, has larger frictional force during two kinds of metal material phase mutual friction, can cause piston
Component premature abrasion, it is unfavorable for improving the working life of actuator.
The content of the invention
To overcome there is larger frictional force during two kinds of metal material phase mutual friction present in prior art, reduce start
The deficiency of device working life, the present invention propose the piston component in a kind of electric brake actuator.
The present invention includes ball-screw, ball-screw nut, piston cylinder, lubrication and keeps set, support sealing ring, needle roller thrust
Bearing, thrust roller bearing, radial needle roller bearing.One end loading lubrication of the ball-screw is kept in set, and is made to be located at and be somebody's turn to do
The gear wheel on ball-screw top is arranged on joined together by needle roller thrust bearing, thrust roller bearing and radial needle roller bearing
The upper surface of actuator housing；The gear wheel is meshed with the reduction gearing of electric brake actuator, to receive the torque of input.
Ball-screw nut is sleeved on the ball-screw, and positioned at the top of the ball-screw.Piston cylinder is sleeved on the lubrication
Keep on set and ball-screw nut, and make the lubrication keep the top of set to be embedded in the positioning table of the piston tube inner surface；
In the inner circumferential surface of the piston cylinder and the lubrication keep that support sealing ring is installed between the outer internal circular surfaces of set.It is described
Lubrication keeps the bottom of set to be placed in the groove at heat insulating mattress center；The bottom of the 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 being meshed with the reduction gearing of electric brake actuator.
There is the central recess coordinated with actuator lid at the center of the gear wheel upper surface, in the central recess cell wall upper inner
There is the seam of ring-type, for installing bearing collar.There is the bearing mounting groove of ring-type on the periphery of the central recess.
Have axially projecting annular boss at the lower surface outer rim of the gear wheel, the boss and gear wheel lower surface it
Between step difference form the mounting surface of needle roller thrust bearing.By the needle roller thrust bearing realize ball-screw with it is joined together
Dynamic cooperation between actuator housing upper surface.
External peripheral surface in the ball-screw lower end is fluted, and being realized by the sealing ring in the groove should
Ball-screw and lubrication keep the sealing between set to coordinate.The bottom outer round surface of the ball-screw is machined with spiral rolling track,
Circulation when ball-screw works for ball.
The internal diameter of the piston cylinder is identical with the external diameter of ball-screw nut, and the external diameter of piston cylinder is slightly less than work joined together
The internal diameter of dynamic device housing, to ensure that piston cylinder will not directly contact with the actuator housing.On the piston tube inner surface
There is the positioning table of radially protruding in portion；Internal diameter at the positioning table is identical with the internal diameter of ball-screw nut.Outside the positioning table
It is stepped to hold lower surface, forms the neck that lubrication keeps set, and the top of the lubrication holding set after assembling is inlaid in the neck
It is interior.In the piston cylinder upper end, inner surface has the mounting groove of ball-screw nut collar.Behind the positioning table upper surface and installation
The distance between ball-screw nut collar lower surface be equal to the axial length of ball-screw nut.
Piston cylinder lower end inner surface has the screw thread coordinated with heat insulating mattress.The internal diameter of the thread segment is less than the piston cylinder cylinder
The internal diameter of wall, and cambered surface transition between the difference in internal diameters of thread segment and piston cylinder barrel.There are two simultaneously in the piston cylinder lower end
The fuse hole of row, aperture of the fuse hole in piston cylinder are located in described cambered surface, and the aperture outside piston cylinder is located at
The piston cylinder barrel external peripheral surface.There is the mounting groove of half guide collar piston cylinder upper end outer surface.
The upper surface of the heat insulating mattress is by groove；Internal diameter keeps the external diameter of set identical with lubrication at the groove notch.It is described
The external peripheral surface of dividing plate is flank.Outer rim in the heat insulating mattress upper surface has ring-type journal stirrup；In the circumferential equal of the journal stirrup
It is furnished with six groups of fuse holes, every group two.
Half guide collar has two, is semi-annular shape.There is dop at the both ends of half and half guide collar respectively, and make this
The dop of half guide collar is located in two guide grooves on the actuator housing, to limit circumferentially rotating for piston cylinder.
The upper surface of set is kept to have 2 positioning boss for protruding the end face, and 2 positioning boss in the lubrication
The upper surface that the lubrication keeps set is symmetrically distributed in, and keeps covering with the lubrication on the positioning table of piston tube inner surface respectively
Neck coordinate, prevent from lubricating holding being enclosed in piston cylinder rotating.Lubrication keeps the middle part of set to pass through in piston cylinder
Support sealing ring is supported, and keeps the periphery of set to seal lubrication.The lubrication keeps the excircle of set lower end
There is the boss of ring-type on surface, the upper surface for keeping set to be supported on heat insulating mattress will be lubricated by the boss, to pass through the boss and work
The positioning table limitation lubrication of plug tube inner surface keeps the axial location of set.
The present invention uses the combined support of radial needle roller bearing+needle roller thrust bearing+thrust roller bearing, makes ball-screw
Spring bearing working life it is longer.Ball-screw is entered by needle roller thrust bearing, thrust roller bearing and radial needle roller bearing
Row support.Wherein, needle roller thrust bearing and thrust roller bearing are set in above gear wheel and following.Their effect
Caused positive axial force and reverse axial force during ball-screw work are subject to respectively.The upper end of ball-screw is machined with
Endoporus, radial needle roller bearing are installed in this endoporus, and fixed by collar.The effect of radial needle roller bearing is subject to ball wire
Caused radial load when thick stick works.
Nut and piston cylinder can not only improve the Corrosion Protection of piston cylinder using different materials, and can reduce spiral shell
Female temperature in use.After heat insulating mattress contacts with brake disc during brake, the heat on brake disc will be passed by heat insulating mattress and piston cylinder
It is directed at nut.So that TC11 titanium alloy materials and Gr15 materials are compared as an example, the thermal conductivity of TC11 materials is about Gr15 materials
A quarter.If piston cylinder uses Gr15 materials, the maximum temperature of nut will be more than 200 DEG C.If piston cylinder uses TC11 materials
Material, then the maximum temperature of nut can be down to less than 150 DEG C.
In order to ensure that the connection between nut and piston cylinder is reliable, prevent from that circumferential slip occurs between them, using interior
Cylindrical interference fit connection.Collar is arranged on the endoporus top of piston cylinder, can prevent nut axial float in piston cylinder.
The present invention is provided with sealing ring in the lower end of ball-screw.Sealing ring keeps the inner headed face of set to remain with lubrication
It is in contact, lubricating grease is remained at ball screw spiral raceway and lubrication is kept in the cavity volume of set inner headed face composition, lubrication
Fat will not be brought away from the lower surface of ball-screw, so as to extend 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；By on heat insulating mattress
Position is gone beyond the limit of during confined planes limitation nut retraction.By the spacing of both direction, ensure that ball-screw at work will not
Generation overtravel is moved, and avoids ball caused by overtravel from departing from raceway and clamping stagnation, when the nut is back and forth run without departing from
Its stroke limit position.
The piston cylinder of piston component is designed as single part by the present invention, and using with high temperature resistant, low heat conductivity and
The material of good corrosion is process, when can effectively reduce brake the operating temperature of nut and to nut carry out anticorrosion
Protection.
Brief description of the drawings
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 scheme of installation of half guide collar on piston cylinder；
Fig. 5 is the guide groove 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 spiral shell
Master card circle；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.
Embodiment
The present embodiment is the piston component in a kind of electric brake actuator, mainly by ball-screw 1, ball-screw nut 2,
Piston cylinder 3, lubrication keep set 4, heat insulating mattress 5, ball-screw nut collar 6, guide collar 7, support sealing ring 8, guide collar 9, close
Seal ring 10, sealing ring 11, needle roller thrust bearing 12, thrust roller bearing 13, radial needle roller bearing 14 and bearing collar 15 form.
One end of the ball-screw 1 loads lubrication and kept in set 4, and leads to the gear wheel positioned at the ball-screw top
Cross the upper surface that needle roller thrust bearing 12 is arranged on actuator housing 17；The reduction gearing of the gear wheel and electric brake actuator
It is meshed, to receive the torque of input.Ball-screw nut 2 is sleeved on the ball-screw, and positioned at the ball-screw
Top.Piston cylinder 3 is sleeved on the lubrication and kept on set 4 and ball-screw nut 2, and makes the lubrication keep the top of set embedding
In the positioning table for entering the piston tube inner surface；In the outer inner circle table of the inner circumferential surface and the lubrication holding set of the piston cylinder
Support sealing ring 8 is installed between face.The lubrication keeps the bottom of set 4 to be placed in the groove at the center of heat insulating mattress 5；The piston
The bottom of cylinder 3 is placed in the upper surface of heat insulating mattress 5.
The circumferential surface of the gear wheel on the top of ball-screw 1 is what is be meshed with the reduction gearing of electric brake actuator
The flank of tooth.There is the central recess coordinated with actuator lid 16 at the center of the gear wheel upper surface, in the central recess cell wall
There is the seam of ring-type surface upper end, for installing bearing collar 15.The bearing for having ring-type on the periphery of the central recess is installed
Groove.During assembling：Actuator lid is arranged in the central recess；It is provided between the actuator lid and central recess cell wall
Radial needle roller bearing 14, and realize by bearing collar 15 positioning of the radial needle roller bearing.Thrust roller bearing 13 is inlaid in
In the bearing mounting groove.
Have axially projecting annular boss at the lower surface outer rim of the gear wheel, the boss and gear wheel lower surface it
Between step difference form the mounting surface of needle roller thrust bearing 12.Ball-screw 1 and start are realized by the needle roller thrust bearing
Dynamic cooperation between the upper surface of device housing 17.
External peripheral surface in the lower end of ball-screw 1 is fluted, real by the sealing ring 11 in the groove
Now the ball-screw and lubrication keep the sealing between set 4 to coordinate.
The bottom outer round surface of the ball-screw 1 is machined with spiral rolling track, when ball-screw works for ball
Circulation.
The ball-screw and ball-screw nut are process using conventional ball screw arrangement material, such as bearing steel
Gr15, nitrided steel 38CrMoAlA are process.
The 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 actuator
17 internal diameter, to ensure that piston cylinder will not directly contact with actuator housing.There is radial convex on the piston tube inner surface top
The positioning table gone out；Internal diameter at the positioning table is identical with the internal diameter of ball-screw nut.It is in positioning table outer end lower surface
It is stepped, the neck that lubrication keeps set 4 is formd, the lubrication after assembling keeps the top of set to be inlaid in the neck.Described
Piston cylinder upper end inner surface has the mounting groove of ball-screw nut collar 6.The positioning table upper surface and the ball wire after installation
The distance between thick stick nut collar lower surface is equal to the axial length of ball-screw nut.
There is the sealing ring neck of radially protruding in the inner surface of the piston cylinder, sealing ring 8 is supported for installing.It is described close
Seal ring neck is located at the lower section of the positioning table.
Piston cylinder lower end inner surface has the screw thread coordinated with heat insulating mattress.The internal diameter of the thread segment is less than the piston cylinder cylinder
The internal diameter of wall, and cambered surface transition between the difference in internal diameters of thread segment and piston cylinder barrel.There are two simultaneously in the piston cylinder lower end
The fuse hole of row, aperture of the fuse hole in piston cylinder are located in described cambered surface, and the aperture outside piston cylinder is located at
The piston cylinder barrel external peripheral surface.
There is the mounting groove of half guide collar 7 piston cylinder upper end outer surface.
The piston cylinder 2 is formed using high-low temperature resistant, low heat conductivity and corrosion resistant metal material processing, to adapt to height
Gentle anticorrosion work environment.In the present embodiment, the piston cylinder is made of titanium alloy.
The heat insulating mattress 5 is made of titanium alloy.There is the dividing plate of axially projecting ring-type the upper surface of the heat insulating mattress, every
Heat pad upper surface has been centrally formed the groove of circle；Internal diameter at the groove notch is minimum, and the external diameter phase of set 4 is kept with lubrication
Together.The external peripheral surface of the dividing plate is flank.Outer rim in the heat insulating mattress upper surface has ring-type journal stirrup；In the journal stirrup
Circumferentially it is evenly equipped with six groups of fuse holes, every group two.
During assembling, first by fuse threading in the fuse hole of piston cylinder 3, then by heat insulating mattress 5 by being threadably mounted at work
The lower end of plug tube 3, then it will pass through and tighten in fuse that group of fuse hole nearest from fuse from heat insulating mattress 5, this
Sample realizes the locking of connection screw thread by locking fuse.Excessive position between the upper journal of heat insulating mattress 5 and upper surface is because be
Thin-wall construction, so rigidity is weaker, when journal stirrup contacts with actuator housing lower surface, this thin-wall construction can produce a small amount of change
Shape, the deformation can absorb certain impact energy.
Half guide collar 7 has two, is semi-annular shape, is added using wear-resisting and small coefficient of friction nonmetallic materials
Work forms.The width of the width of the guide collar and the mounting groove of piston cylinder upper end outer surface is adapted, internal diameter and the mounting groove
External diameter it is identical, make the inner headed face of the later half guide collar 7 of installation in the mounting groove on the piston cylinder.Half and half guide collar
Both ends have dop respectively.It is engaged after the installation of half guide collar 7 with actuator housing 17.It is symmetrical in actuator shell inner surface
It is machined with two guide grooves；After piston component is arranged in actuator housing, the external peripheral surface and actuator of half guide collar 7
The inner surface of housing coordinates, and the dop of half guide collar 7 is located in described two guide grooves, is turned with limiting the circumference of piston cylinder
It is dynamic.
Guide collar 9 and sealing ring 10 are installed in the bottom of actuator housing 17.The guide collar 7 of guide collar 9 and half is jointly right
Piston cylinder 3 carry out it is axially directed, to reduce the frictional force between actuator housing and piston cylinder, and prevent when piston cylinder from working with
It is in contact between actuator housing.The effect of sealing ring 10 is that the periphery of piston cylinder is sealed, and prevents foreign object from entering
With prevent lubricating grease flow out actuator.
The lubrication keeps the Circular Thin housing that set 4 is lower end closed, is using high-low temperature resistant, low heat conductivity, friction
Number is small and nonmetallic materials that are having some strength are made, and it is polyimides that the lubrication, which keeps the material of set, in the present embodiment.Institute
Stating lubrication keeps the upper surface of set 4 to have 2 positioning boss for protruding the end face, and 2 positioning boss are symmetrically distributed
The upper surface of set is kept in the lubrication, and keeps the neck of set to match somebody with somebody with the lubrication on the positioning table of the inner surface of piston cylinder 3 respectively
Close, prevent lubrication from keeping set 4 to be rotated in piston cylinder 3.Lubrication keeps the middle part of set 4 to pass through the support in piston cylinder 3
Sealing ring 8 is supported, and keeps the periphery of set 4 to seal lubrication.The lubrication keeps the cylindrical weekly form of 4 lower ends of set
There is the boss of ring-type in face, the upper surface for keeping set to be supported on heat insulating mattress 5 will be lubricated by the boss, to pass through the boss and piston
The positioning table limitation lubrication of 3 inner surfaces of cylinder keeps the axial location of set.
The course of work of the present embodiment is：When ball-screw rotates forward, nut under the driving of ball-screw with work
Plug tube 3 is stretched out together, and due to the cooperation limitation of guide groove on half guide collar 7 and actuator housing 17, nut can only do straight line and stretch
Go out motion.After generally piston cylinder extend out to the braking action power required for heat insulating mattress 5 is contacted and produced with brake disc, spiral shell
Mother is with regard to stop motion.When under special circumstances, as being fitted without brake disc on brake gear, piston cylinder does stretching motion, always
Small boss end contact on to piston cylinder 3 is to the bottom of the guide groove of actuator housing 17.The bottom of guide groove is entered to piston cylinder 3
Row stretches out position limitation protection, it is ensured that nut 2 and piston cylinder 3 will not excessively stretch out, and avoid the spin of ball-screw because nut is out of the line
Journey and depart from raceway, such case is as shown in Figure 7.When ball-screw reversely rotates, nut under the driving of ball-screw with
Piston cylinder 3 bounces back together, and because half guide collar 7 and the cooperation of guide groove on actuator housing 17 limit, nut can only do straight line
Move retracting motion.The generally control of controlled device, piston cylinder retraction certain distance after by stop bounce back.But in spy
In the case of different, during such as control device hardware fault or abnormal software work, piston cylinder will do retracting motion always, until heat-insulated
The journal stirrup of pad 5 touches the lower surface of actuator housing 17.The journal stirrup position of heat insulating mattress 5 carries out the spacing guarantor that bounces back to piston cylinder 3
Shield, it is ensured that nut 2 and piston cylinder 3 will not overtravel retraction, avoid because overtravel retraction may caused by nut 2 and ball wire
Axial movement interference between thick stick 1.Such case is as shown in Figure 8.
Claims (8)
1. the piston component in a kind of electric brake actuator, it is characterised in that including ball-screw, ball-screw nut, piston
Cylinder, lubrication keep set, support sealing ring, needle roller thrust bearing, thrust roller bearing, radial needle roller bearing；The ball-screw
One end load lubrication keep set in, and make positioned at the ball-screw top gear wheel pass through needle roller thrust bearing, thrust roll
Sub- bearing and radial needle roller bearing is arranged on the upper surface of actuator housing joined together；The gear wheel and electric brake actuator
Reduction gearing be meshed, with receive input torque；Ball-screw nut is sleeved on the ball-screw, and is located at the rolling
The top of ballscrew；Piston cylinder is sleeved on the lubrication and kept on set and ball-screw nut, and the lubrication is kept set
Top is embedded in the positioning table of the piston tube inner surface；In the inner circumferential surface of the piston cylinder the outer of set is kept with the lubrication
Support sealing ring is installed between internal circular surfaces；The lubrication keeps the bottom of set to be placed in the groove at heat insulating mattress center；It is described
The bottom of 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 gear wheel on ball-screw top
Circumferential surface be the flank of tooth that is meshed with the reduction gearing of electric brake actuator；Have at the center of the gear wheel upper surface with
The central recess that actuator lid coordinates, has the seam of ring-type, for installing bearing card in the central recess cell wall upper inner
Circle；There is the bearing mounting groove of ring-type on the periphery of the central recess；Have at the lower surface outer rim of the gear wheel axially convex
The annular boss gone out, the step difference between the boss and gear wheel lower surface form the mounting surface of needle roller thrust bearing；Pass through
The needle roller thrust bearing realizes the dynamic cooperation 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 in the ball-screw lower end
External peripheral surface is fluted, realizes that the ball-screw and lubrication keep close between covering by the sealing ring in the groove
Envelope coordinates；The bottom outer round surface of the ball-screw is machined with spiral rolling track, the following for ball when ball-screw works
Ring.
4. the piston component in electric brake actuator as claimed in claim 1, it is characterised in that the internal diameter of the piston cylinder and rolling
The external diameter of screw nut is identical, and the external diameter of piston cylinder is slightly less than the internal diameter of actuator housing joined together, to ensure piston cylinder
Will not directly it be contacted with the actuator housing；There is the positioning table of radially protruding on the piston tube inner surface top；The positioning
Internal diameter at platform is identical with the internal diameter of ball-screw nut；It is stepped in positioning table outer end lower surface, forms lubrication
The neck of set is kept, the lubrication after assembling keeps the top of set to be inlaid in the neck；In the piston cylinder upper end, inner surface has
The mounting groove of ball-screw nut collar；Between ball-screw nut collar lower surface behind the positioning table upper surface and installation
Distance be equal to ball-screw nut axial length.
5. the piston component in electric brake actuator as claimed in claim 1, it is characterised in that piston cylinder lower end inner surface
There is the screw thread coordinated with heat insulating mattress；The internal diameter of the thread segment is less than the internal diameter of the piston cylinder barrel, and thread segment and piston cylinder
Cambered surface transition between the difference in internal diameters of barrel；There are two fuse holes arranged side by side in the piston cylinder lower end, the fuse hole is in work
Aperture in plug tube is located in described cambered surface, and the aperture outside piston cylinder is located at the piston cylinder barrel external peripheral surface；It is described
There is the mounting groove of half guide collar piston cylinder upper end outer surface.
6. the piston component in electric brake actuator as claimed in claim 1, it is characterised in that the upper surface of the heat insulating mattress has
Groove；Internal diameter keeps the external diameter of set identical with lubrication at the groove notch；The external peripheral surface of dividing plate is flank；It is described every
The outer rim of heat pad upper surface has ring-type journal stirrup；Six groups of fuse holes are evenly equipped with the circumference of the journal stirrup, every group two.
7. the piston component in electric brake actuator as claimed in claim 5, it is characterised in that half guide collar has two,
It is semi-annular shape；There is dop at the both ends of half and half guide collar respectively, and the dop of half guide collar is located at the start
In two guide grooves on device housing, to limit circumferentially rotating for piston cylinder.
8. the piston component in electric brake actuator as claimed in claim 1, it is characterised in that keep the upper of set in the lubrication
There are 2 positioning boss for protruding the end face end face, and 2 positioning boss are symmetrically distributed in the lubrication and keep set
Upper surface, and the neck for keeping set with the lubrication on the positioning table of piston tube inner surface respectively coordinates, and prevents that lubricating holding is enclosed on
Rotated in piston cylinder；Lubrication keeps the middle part of set to be supported by the support sealing ring in piston cylinder, and to lubrication
The periphery of set is kept to be sealed；The lubrication keeps the external peripheral surface of set lower end to have the boss of ring-type, passes through the ring-type
Boss will lubricate and keep set to be supported on the upper surface of heat insulating mattress, limited with passing through the positioning table of the boss and piston tube inner surface
Lubrication keeps the axial location of set.
Priority Applications (1)
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105697619A CN105697619A (en) | 2016-06-22 |
| CN105697619B true CN105697619B (en) | 2017-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610149431.3A Active CN105697619B (en) | 2016-03-16 | 2016-03-16 | Piston component in electric brake actuator |
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| Country | Link |
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| CN (1) | CN105697619B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| DE102018127660B4 (en) * | 2018-11-06 | 2023-07-20 | Schaeffler Technologies AG & Co. KG | Device for adjusting the level of a vehicle body |
| CN109896044B (en) * | 2019-04-04 | 2024-03-29 | 西安航空制动科技有限公司 | Piston resetting device for aviation brake wheel |
| CN112682441B (en) * | 2020-12-25 | 2022-06-24 | 中国航天空气动力技术研究院 | Dual-redundancy actuator of electric brake device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105697619A (en) | 2016-06-22 |
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