CN109204282A - A kind of motor-driven brake actuator and its braking method - Google Patents
A kind of motor-driven brake actuator and its braking method Download PDFInfo
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- CN109204282A CN109204282A CN201811198946.8A CN201811198946A CN109204282A CN 109204282 A CN109204282 A CN 109204282A CN 201811198946 A CN201811198946 A CN 201811198946A CN 109204282 A CN109204282 A CN 109204282A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/745—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
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- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
A kind of motor-driven brake actuator, including motor (7), lubricating cup (20), driving mechanism (30), hydraulic pump (31), the driving mechanism (30) includes: gear-box rear cover (1), ball screw axis, ball screw axis (2) end is equipped with screw rod positioning pin (28), a part of the ball screw axis (2) and screw rod positioning pin (28) are set in screw rod positioning sleeve (27), the end of the screw rod positioning sleeve (27) is resisted against inside gear-box rear cover, the head end of the screw rod positioning sleeve also sets up ball screw nut (24), rolling bearing is set on the outside of the ball screw nut.Motor-driven brake actuator of the present invention has following good effect: using motor driven, fast response time, the response time is 120 milliseconds to 150 milliseconds or so, 200 to 300 milliseconds shorter than the response time of ESP module.
Description
Technical field
The present invention relates to field of automobile brake, especially a kind of motor-driven brake actuator.
Background technique
With the continuous progress of technology, electric drive is applied in large quantities in the car, for electronic driver or mixing
The vehicle of power drive unit is verified, and the brake actuator of electric drive vehicle or hybrid vehicle makes conventional brake fluid
Pressure system becomes extra, and vehicle driver, which does as usual, operates the brake pedal of vehicle, but it overcomes spring or the bullet by spring generation
Power generates the feeling of similar conventional vehicular brake pedal.In the control unit of vehicle, the power of brake pedal is trampled by driver
The brake force for each wheel of vehicle is calculated, generates the pressing force of brake unit by control unit at single wheel.
However, currently, the development of the control unit about motor-driven brake actuator and immature.It is badly in need of a kind of stabilization, reliable
And the strong brake actuator control unit of endurance fills up technological gap.
Summary of the invention
First aspect present invention provides a kind of motor-driven brake actuator comprising motor, lubricating cup, driving mechanism,
Hydraulic pump, the driving mechanism include: gear-box rear cover, ball screw axis, rolling bearing, gear II, gear I, gearhousing
Body, ball screw nut, inner shield ring I, housing seal circle I, screw rod positioning sleeve, screw rod positioning pin, the ball screw shaft end
Equipped with screw rod positioning pin, for a part and screw rod set pin sleeve of the ball screw axis loaded in screw rod positioning sleeve, the screw rod is fixed
The end of position set is resisted against inside gear-box rear cover, and the head end of the screw rod positioning sleeve also sets up ball screw nut, the rolling
It is set with rolling bearing on the outside of ballscrew nut, is also equipped with gear II on the outside of the ball screw nut, gear II and motor
Drive the gear I engagement of shaft end suit, the gear-box rear cover connection gear tank shell.
Gear II, ball screw nut, rolling bearing become a component by interference or other fixed forms.
Screw rod positioning sleeve is cooperated by interference or other fixed forms with gear-box rear cover.
Motor, which is located at gear box casing left end, gear I and motor, becomes one by interference fit or other fit systems
A component realizes transmission agency.
Hydraulic pump is located at the left end of driving mechanism, is staggered with motor, and the hydraulic pump includes the pump housing, the pump housing and driving machine
Gear box casing connection in structure, hydraulic pump further includes limited screw, reset spring II, relay piston I, piston fixed pin, cup
It is shape sealing element I, piston stopper pin, cup seal II, spring base I, relay piston II, reset spring I, spring base II, driven
Piston I II.The pump housing is equipped with oil outlet I and oil outlet II, oil inlet I and oil inlet II；Cup-shaped is housed on the relay piston III
It is solid that the left end sealing element I, relay piston III is sequentially arranged with spring base II, limited screw, reset spring II, relay piston I, piston
Rationed marketing, cup seal I, piston stopper pin, cup seal II, spring base I, relay piston II, reset spring I；Driven work
Plug I is linked together by limited screw and relay piston III, and relay piston I and relay piston II are solid by piston fixed pin
It is scheduled on together, becomes a component, the starting force of the adjustable reset spring II of limited screw.
Reset spring I is set gradually in the pump housing from left to right, one end of reset spring I is set in relay piston II
Left end, the right end of relay piston II connects relay piston I；
Chamber V is constituted between the left end relay piston II and the pump housing, is constituted between the pump housing in the middle part of the relay piston II
Chamber IV, relay piston I include hydraulic port, the relay piston II Inner Constitution chamber III, outside the relay piston II with it is described
Chamber II is constituted between the pump housing.It is also equipped with relay piston III in the pump housing of the relay piston I right end, relay piston III and institute
Setting reset spring II between relay piston I is stated, chamber I is constituted between relay piston III and the pump housing.
Cylinder body is divided into chamber I, chamber II, chamber III, chamber IV, chamber V by above-mentioned cup seal I and cup seal II everywhere
Totally five chambers, the flow direction of brake fluid is all unidirectional between adjacent chamber.
The relay piston III right end includes groove, and the optical axis portion of ball screw axis left end is accommodated in the groove.
It further include at least one oil inlet and at least one oil outlet on the pump housing, the oil inlet is connected to the lubricating cup.
Lubricating cup is located at the top of hydraulic pump.
The working principle of motor-driven brake actuator of the present invention:
Brake pedal is stepped on, and control system is according to the letter of the Hall sensor aperture of driver's pedal (sensor according to)
Number, motor is rotated, the gear I rotation being mounted on motor output shaft is driven.Gear I rotation drives the gear II being engaged with
Rotation, ball screw nut are interference fitted into gear II and rotate together, and realize that ball screw axis horizontally slips and (do not rotate),
When braking, ball screw axially left sliding.
Limited screw is together by a threaded connection with relay piston III and slides left and right.
Brake fluid respectively enters chamber I, chamber IV through oil inlet I, oil inlet II from lubricating cup.Through cup seal I, Cup-shaped seal
Part II reaches chamber II.Ball screw axially left sliding drives relay piston III to slide together to the left with limited screw, limits spiral shell
Silk slide to the left, the space compression chamber III leads to the hydraulic increase of chamber III, and brake fluid is orally pressed into chamber II, at the same time, due to from
Piston III moves downward compression chamber II, leads to hydraulic increase, and chamber II brake fluid is exported from oil outlet II.
Relay piston I, relay piston II are attached by piston fixed pin, relay piston I, relay piston II, piston
Fixed pin three slides left and right together, referred to as piston component.
In addition, relay piston II is equipped with piston stopper pin, which limits the sliding scale of relay piston II, resistance
Only relay piston II is excessively slided to the right.As a result, especially when intelligent hydraulic force aid system fails, using fluid pressure type system
When dynamic, when a thrashing, another system is prevented to fail, starting protection effect.Using piston component as object, do not start
When braking, piston component is in the leftmost side, and the power that reset spring I acts on piston component is more than or equal to reset spring II and acts on
The power of piston component.When braking, relay piston III compression chamber II and reset spring II to the left is pressurized on the right side of piston component
When power is greater than left side pressure, piston component slides to the left, compression chamber V, leads to hydraulic increase, and V brake fluid of chamber is from fuel-displaced
Mouth I output.
Brake pedal release, releases braking, (sensor is according to driver's pedal according to Hall sensor for control system
Aperture) signal, rotate backward motor, drive be mounted on motor output shaft gear I rotation.Gear I rotation drive with
Meshed gears II rotation, ball screw nut presses to gear II interference and rotates together, and realizes the axial right side of ball screw
Sliding.At this point, relay piston III left pressure is greater than right side, relay piston III also slides to the right together, reset spring II by
Step resets, and spring force gradually reduces, at this point, piston component left pressure is greater than right atrial pressure, piston component Slideslip to the right, and chamber
V, chamber II, the hydraulic reduction of chamber III, brake fluid are back to chamber V, chamber II, chamber III from oil outlet I, II mouthfuls of oil outlet respectively, oil
The release of cup edge arrow direction supplements brake fluid to chamber IV, chamber I, and chamber IV, chamber I will be made by cup seal I, cup seal II
Hydrodynamic is supplemented to chamber V, chamber II, chamber III, is finally reached original state.
Second aspect of the present invention provides a kind of braking method of motor-driven brake actuator comprising:
Step S1: brake pedal is stepped on, and control system rotates motor according to the signal of sensor；Drive is mounted on electricity
Gear I rotation on machine output shaft.
Step S2: gear I rotation drives the gear II rotation being engaged with, and ball screw nut and gear II are interference fitted
To rotating together, realize that ball screw axis horizontally slips, when braking, ball screw axially left sliding；Limited screw and driven work
Plug III, which is together by a threaded connection, to be slid left and right.
Step S3: brake fluid respectively enters chamber I, chamber IV through oil inlet from lubricating cup, and through cup seal I, Cup-shaped seal
Part II reaches chamber II.
Step S4: ball screw axially left sliding drives relay piston III to slide together to the left with limited screw, limits
Screw slides to the left, and the space compression chamber III leads to the hydraulic increase of chamber III, and brake fluid is orally pressed into chamber II, at the same time, due to
Relay piston III moves downward compression chamber II, leads to hydraulic increase, and chamber II brake fluid is exported from oil outlet II.
Step S5: relay piston I, relay piston II is attached by piston fixed pin, relay piston I, relay piston
II, piston fixed pin three slide left and right together.The sliding of the piston stopper pin limitation relay piston II of relay piston II
Range prevents relay piston II from excessively sliding to the right.As a result, especially when intelligent hydraulic force aid system fails, use is hydraulic
When formula is braked, when a thrashing, another system is prevented to fail, starting protection effect.
Step S6: brake pedal release releases braking, and control system keeps motor reversed according to the signal of Hall sensor
Rotation drives the gear I rotation being mounted on motor output shaft；Gear I rotation drives the gear II rotation being engaged with, ball
Feed screw nut presses to gear II interference and rotates together, and realizes ball screw axially right sliding.At this point, relay piston III is left
Lateral pressure is greater than right side, and relay piston III is also slided to the right together, and reset spring II gradually resets, and spring force gradually reduces, this
When, piston component left pressure is greater than right atrial pressure, and piston component to the right make by Slideslip, chamber V, chamber II, the hydraulic reduction of chamber III
Hydrodynamic is back to chamber V, chamber II, chamber III from oil outlet, and for lubricating cup release supplement brake fluid to chamber IV, chamber I, chamber IV, chamber I pass through cup
Brake fluid is supplemented to chamber V, chamber II, chamber III by shape sealing element I, cup seal II, is finally reached original state.
Using piston component as object, when not starting braking, piston component is in the rightmost side, and reset spring I acts on work
The power of plug assembly is more than or equal to the power that reset spring II acts on piston component.When braking, relay piston III compression chamber II to the left
And reset spring II, when pressure is greater than left side pressure on the right side of piston component, piston component slides to the left, compression chamber
V, lead to hydraulic increase, V brake fluid of chamber is exported from oil outlet I.
Successively execute step S1- step S6.
Motor-driven brake actuator of the present invention has following good effect:
1. using motor driven, fast response time, the response time is 120 milliseconds to 150 milliseconds or so, than ESP module
Response time want 200 to 300 milliseconds short.
2. motor driven, ECU control, may be mounted on the vehicle of automatic Pilot, are a kind of future developing trends.
3. it is compact-sized, components cost is reduced, also has certain reduction in size and weight, meets present development of automobile
Trend.
4. DC brushless motor used in the present apparatus designs a kind of fuzzy PID control strategy of parameter adaptive, gram
The parameter of the parameter and dragging load that take traditional motor itself can change in the process of running, so that preset parameter
The shortcomings that PID controller cannot make system all keep performance indicator when designing under various operating conditions.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of a preferred embodiment of motor-driven brake actuator of the present invention；
Fig. 2 is the internal cross section structural schematic diagram of embodiment illustrated in fig. 1；
Specific embodiment
Embodiment 1.1: a kind of motor-driven brake actuator, it includes motor 7, lubricating cup 20, driving machine as shown in Figure 1
Structure 30, hydraulic pump 31, driving mechanism 30 as described in Figure 2 include: gear-box rear cover 1, ball screw axis 2, rolling bearing 3, gear
II 4, gear I 5, gear box casing 6, ball screw nut 24, inner shield ring I 25, housing seal circle I 26, screw rod positioning sleeve
27, screw rod positioning pin 28,2 end of ball screw axis are equipped with screw rod positioning pin 28, a part and silk of the ball screw axis 2
Bar positioning pin 28 is set in screw rod positioning sleeve 27, and the end of the screw rod positioning sleeve 27 is resisted against inside gear-box rear cover 1, institute
The head end for stating screw rod positioning sleeve 27 also sets up ball screw nut 24, is arranged between screw rod positioning sleeve 27 and ball screw nut 24
Inner shield ring I 25, two rolling bearings 3 are pressed on the outside of the ball screw nut 24, and 24 outside of ball screw nut also fills
There is gear II 4, gear II 4 is engaged with the gear I 5 that the driving shaft end of motor 7 is set with, and the gear-box rear cover 1 connects
Gear box casing 6, the gear box casing 6 are also set on the outside of the output shaft of the motor 7, and gear box casing 6 is by gear II
4 coat wherein with gear I 5.Gear box casing 6 and gear-box rear cover 1 are attached by bolt, and with housing seal circle I26
It is sealed.Gear box casing 6 is equipped with gear I 5, gear II 4, rolling bearing 3, ball screw nut 24.4 He of gear II
Ball screw axis 2 is connected by ball screw nut 24, and is supported with rolling bearing 3.Gear II 4, ball screw nut 24,
Rolling bearing 3 becomes a component by interference or other fixed forms.Screw rod positioning sleeve 27 passes through interference or other
Fixed form is cooperated with gear-box rear cover 1, and screw rod positioning pin 28 and ball screw axis 2 are interference fitted, and in its right end, makes to roll
Slot of the ballscrew axis 2 on screw rod positioning sleeve 27 slides left and right, and does not rotate.
Motor 7 is located at 6 left end of gear box casing.Motor 7 is bolted on the gear box casing 6 in driving mechanism
On, gear I 5 and machine shaft become a component, realize transmission agency by interference fit.
Hydraulic pump 31 is located at the left end of driving mechanism 30, is staggered with motor 7, and the hydraulic pump 31 includes the pump housing 18, the pump
Body 18 is connect with the gear box casing 6 in driving mechanism by flange face, and hydraulic pump 31 further includes limited screw 8, reset spring
II 9, relay piston I 10, piston fixed pin 11, cup seal I 12, piston stopper pin 13, cup seal II14, bullet
Spring abutment I 15, relay piston II 16, reset spring I 17, spring base II 21, relay piston III 22.The pump housing 18 is equipped with fuel-displaced
Mouth I 29a and oil outlet II 29b, oil inlet I 32a and oil inlet II 32b；Cup-shaped is housed on the relay piston III 22
Sealing element I 12 and cup seal II 14, two sealing elements play the role of one-way sealing, the left end relay piston III22 according to
It is secondary that spring base II 21, reset spring II 9, relay piston I 10, piston fixed pin 11, piston stopper pin 13, driven work are housed
Fill in II 16, reset spring I 17；Relay piston I 10 is linked together by limited screw 8 and relay piston III 22, driven
Piston I 10 and relay piston II 16 are fixed together by piston fixed pin 11, become a component, limited screw 8 can
To adjust the starting force of reset spring II 9.
Set gradually reset spring I 17 from left to right in the pump housing 18, one end of reset spring I 17 be set in from
The right end of the left end of piston II 16, relay piston II 16 connects relay piston I 10.
Piston fixed pin 11 is arranged in the junction of relay piston II 16 and relay piston II 10, and relay piston II 16 is left
End also sets up cup seal II 14, is also equipped with bullet between 16 left end relay piston II and the reset spring II 17
Spring abutment II 15.
Chamber V is constituted between 16 left end relay piston II and the pump housing 18,16 right end of the relay piston III setting cup-shaped is close
Sealing III 12 constitutes chamber IV between 16 middle part relay piston III and the pump housing 18.
Relay piston II 10 includes hydraulic port 10a, the 10 Inner Constitution chamber III of relay piston II, the driven work
It fills in and constitutes chamber II between 10 outside II and the pump housing 18, be connected between hydraulic port 10 and chamber III and chamber II.The driven work
It fills in the pump housing 18 of 10 right end of II and is also equipped with relay piston III 22, relay piston III 22 and the relay piston II 10
Between be arranged reset spring II 9, between relay piston III 22 and the pump housing 18 constitute chamber III.
Cylinder body is divided into chamber I, chamber II, chamber III, chamber by above-mentioned cup seal I12 and cup seal II 14 everywhere
IV, totally 5 chambers of chamber V, the flow direction of brake fluid is all unidirectional, direction as shown by the arrows in Figure 2 between adjacent chamber.
The reset spring II 9 is resisted against 22 left end relay piston III, the driven work by spring base II 21
The plug left end III22 also sets up cup seal III 14, between the relay piston III 10 and the relay piston III 22
It is additionally provided with limited screw 8.The right end of the relay piston III 22 also is provided with cup seal II 12, the relay piston
22 right end of III includes groove, and the optical axis portion of 2 left end of ball screw axis is accommodated in the groove.
It further include at least one oil inlet and at least one oil outlet on the pump housing 18, the oil inlet and the lubricating cup connect
It is logical.
Lubricating cup 20 is located at the top of hydraulic pump 31, is connected by bolt and the pump housing 18, while passing through lubricating cup sealing element
The 19 sealing pump housings.
The working principle of motor-driven brake actuator described in above-described embodiment:
Brake pedal is stepped on, and control system is according to the letter of the Hall sensor aperture of driver's pedal (sensor according to)
Number, motor 7 is rotated, the gear I 5 being mounted on 7 output shaft of motor is driven to rotate.The rotation drive of gear I 5 is engaged with
Gear II 4 is rotated, and ball screw nut 24 is interference fitted into gear II 4 and rotates together, and realizes that ball screw axis 2 or so is sliding
Dynamic (not rotating), when braking, ball screw axis 2 slides to the left.Limited screw 8 is connected through a screw thread with relay piston III 22
It slides left and right together.
Brake fluid respectively enters chamber I, chamber IV through oil inlet I 32a, oil inlet II 32b from lubricating cup 20.Through cup seal
I 12, cup seal II 14 reach chamber II.Ball screw axis 2 slides to the left, drives relay piston III 22 and limited screw
8 slide together to the left, and limited screw 8 slides to the left, and the space compression chamber III leads to the hydraulic increase of chamber III, and brake fluid is through 10a mouthfuls
Indentation chamber II since relay piston III 22 moves downward compression chamber II, leads to hydraulic increase, chamber II brake fluid at the same time
It is exported from oil outlet II 29b.
Relay piston I 10, relay piston II 16 are attached by piston fixed pin 11, relay piston I 10, driven
Piston I I 16,11 three of piston fixed pin slide left and right together, referred to as piston component.
In addition, relay piston II 16 is equipped with piston stopper pin 13, which limits relay piston II's 16
Sliding scale prevents relay piston II 16 from excessively sliding to the right.It is especially adopted as a result, when intelligent hydraulic force aid system fails
When being braked with fluid pressure type, when a thrashing, another system is prevented to fail, starting protection effect.With piston component
As object, when not starting braking, piston component be in the leftmost side, reset spring I 17 act on the power of piston component greater than etc.
The power of piston component is acted in reset spring II 9.When braking, relay piston III 22 compression chamber II and reset spring to the left
II 9, when pressure is greater than left side pressure on the right side of piston component, piston component slides to the left, and compression chamber V causes
Hydraulic increase, V brake fluid of chamber are exported from oil outlet I 29a.
Brake pedal release, releases braking, (sensor is according to driver's pedal according to Hall sensor for control system
Aperture) signal, rotate backward motor 7, the gear I 5 that is mounted on 7 output shaft of motor driven to rotate.Gear I 5 is rotated
The gear II 4 being engaged with is driven to rotate, 4 interference of ball screw nut 24 and gear II, which presses to, to be rotated together, and realizes rolling
Ballscrew axis 2 slides to the right.At this point, 22 left pressure of relay piston III be greater than right side, relay piston III 22 also together to
Right sliding, reset spring II 9 gradually reset, and spring force gradually reduces, at this point, piston component left pressure is greater than right atrial pressure,
Slideslip, chamber V, chamber II, the hydraulic reduction of chamber III, brake fluid are back to chamber V, chamber from 29a, 29b mouthfuls to piston component respectively to the right
II, chamber III, lubricating cup 20 discharge supplement brake fluid to chamber IV, chamber I in the direction of the arrow, chamber IV, chamber I by cup seal I 12,
Brake fluid is supplemented to chamber V, chamber II, chamber III by cup seal II 14, is finally reached original state.
A kind of embodiment 2.1: braking method of motor-driven brake actuator comprising
Step 1: brake pedal is stepped on, the opening amount signal for driver's pedal that control system is detected according to sensor,
Rotate motor 7；The gear I 5 being mounted on 7 output shaft of motor is driven to rotate.
Step 2: the rotation of gear I 5 drives the gear II 4 being engaged with to rotate, ball screw nut 24 and gear II 4
It is interference fitted into and rotates together, realize that ball screw axis 2 horizontally slips, when braking, ball screw axis 2 slides to the left, and does not have
Rotation；Limited screw 8 is together by a threaded connection with relay piston III 22 and slides left and right.
Step 3: brake fluid respectively enters chamber I, chamber IV through oil inlet I 32a and oil inlet II 32b from lubricating cup 20, and passes through
Cup seal I 12, cup seal II 14 reach chamber II.
Step 4: ball screw axis 2 slides to the left, and relay piston III 22 is driven to slide together to the left with limited screw 8,
Limited screw 8 slides to the left, the space compression chamber III, leads to the hydraulic increase of chamber III, brake fluid is through 10a mouthfuls of indentation chamber II, with this
Simultaneously as relay piston III 22 moves downward compression chamber II, lead to hydraulic increase, chamber II brake fluid is defeated from oil outlet 29b
Out.
Step 5: relay piston I 10, relay piston II 16 are attached by piston fixed pin 11, relay piston I
10, relay piston II 16,11 three of piston fixed pin slide left and right together.The piston stopper pin 13 of relay piston II 16
The sliding scale for limiting relay piston II 16, prevents relay piston II 16 from excessively sliding to the right.As a result, especially when intelligent liquid
When pressing force aid system failure, when being braked using fluid pressure type, when a thrashing, another system is prevented to fail, starting
Protective effect.
Step 6: brake pedal release releases braking, and control system keeps motor 7 reversed according to the signal of Hall sensor
Rotation drives the gear I 5 being mounted on 7 output shaft of motor to rotate；The rotation of gear I 5 drives 4 turns of gear II be engaged with
Dynamic, 4 interference of ball screw nut 24 and gear II, which presses to, to be rotated together, and realizes that ball screw axis 2 slides to the right.At this point, from
22 left pressure of piston III is greater than right side, and relay piston III 22 is also slided to the right together, and reset spring II 9 is gradually multiple
Position, spring force gradually reduces, at this point, piston component left pressure is greater than right atrial pressure, piston component Slideslip to the right, chamber V,
Chamber II, the hydraulic reduction of chamber III, brake fluid are back to chamber V, chamber II, chamber from oil outlet I 29a, 29b mouthfuls of oil outlet II respectively
III, lubricating cup 20 discharge supplement brake fluid to chamber IV, chamber I in the direction of the arrow, and chamber IV, chamber I pass through cup seal I 12, cup-shaped
Brake fluid is supplemented to chamber V, chamber II, chamber III by sealing element II 14, is finally reached original state.
Successively execute step 1- step 6.
Using piston component as object, when not starting braking, piston component is in the leftmost side, and reset spring I 17 is acted on
The power of piston component is more than or equal to the power that reset spring II 9 acts on piston component.When braking, relay piston III 22 is to the left
Compression chamber II and reset spring II 9, when pressure is greater than left side pressure on the right side of piston component, piston component is to the left
Sliding, compression chamber V lead to hydraulic increase, and V brake fluid of chamber is exported from oil outlet I 29a.
Claims (10)
1. a kind of motor-driven brake actuator, it is characterised in that: including motor (7), lubricating cup (20), driving mechanism (30),
Hydraulic pump (31), the driving mechanism (30) include: gear-box rear cover (1), ball screw axis (2), ball screw axis (2) end
Equipped with screw rod positioning pin (28), a part of the ball screw axis (2) and screw rod positioning pin (28) are set in screw rod positioning sleeve
(27) in, the end of the screw rod positioning sleeve (27) is resisted against gear-box rear cover (1) inside, the head of the screw rod positioning sleeve (27)
End is also set up ball screw nut (24), is set with rolling bearing (3) on the outside of the ball screw nut (24), the ball screw
It is also equipped with gear II (4) on the outside of nut (24), the gear I (5) that the driving shaft end of gear II (4) and motor (7) is set with is nibbled
It closes, the gear-box rear cover connection gear tank shell (6), gear II (4), ball screw nut (24), rolling bearing (3) pass through
Interference or other fixed forms, become a component, screw rod positioning sleeve (27) by interference or other fixed forms with
Gear-box rear cover (1) is cooperated.
2. motor-driven brake actuator as described in claim 1, it is characterised in that: gear I (5) and motor (7) cooperate
As a component, hydraulic pump (31) includes the pump housing (18), and the gear box casing (6) in the pump housing (18) and driving mechanism is even
It connects, hydraulic pump (31) further includes limited screw (8), reset spring II (9), relay piston I (10), piston fixed pin (11), cup
Shape sealing element I (12), it piston stopper pin (13), cup seal II (14), spring base I (15), relay piston II (16), resets
Spring I (17), spring base II (21), relay piston III (22), the pump housing (18) are equipped with oil outlet and oil inlet；The driven work
It fills in and cup seal I is housed on III (22), relay piston III (22) left end is sequentially arranged with spring base II (21), reset spring II
(9), relay piston I (10), piston fixed pin (11), piston stopper pin (13), relay piston II (16), reset spring I (17)；
Relay piston I (10) is linked together by limited screw (8) with relay piston III (22), relay piston I (10) and driven work
Plug II (16) is fixed together by piston fixed pin (11), becomes a component, the adjustable reset bullet of limited screw (8)
The starting force of spring II (9).
3. motor-driven brake actuator as described in claim 1, it is characterised in that: in the pump housing (18) from left to right successively
It is arranged reset spring I (17), one end of reset spring I (17) is set in the left end of (16) relay piston II, the relay piston
The right end of II (16) connects relay piston I (10)；Between (16) left end relay piston II and the pump housing (18) constitute chamber V, it is described from
Chamber IV is constituted in the middle part of piston III (16) between the pump housing (18).
4. motor-driven brake actuator as claimed in claim 3, it is characterised in that: relay piston II (10) includes hydraulic
Mouthful, chamber II is constituted between the outside relay piston II (10) Inner Constitution chamber III, relay piston II (10) and the pump housing (18), it is driven
It is also equipped with relay piston III (22) in the pump housing (18) of piston I I (10) right end, relay piston III (22) and relay piston II
(10) reset spring II (9) are set between, chamber III is constituted between relay piston III (22) and the pump housing (18).
5. motor-driven brake actuator as claimed in claim 4, it is characterised in that: cup seal I (12) and cup-shaped
Cylinder body is divided into chamber I, chamber II, chamber III, chamber IV, chamber V totally five chambers by sealing element II (14), the stream of brake fluid between adjacent chamber
To being all unidirectional.
6. motor-driven brake actuator as claimed in claim 2, it is characterised in that: the relay piston III (22) is right
End includes groove, and the optical axis portion of ball screw axis (2) left end is accommodated in the groove.
7. motor-driven brake actuator as described in claim 1, it is characterised in that: further include at least one on the pump housing (18)
A oil inlet and at least one oil outlet, the oil inlet are connected to the lubricating cup (20).
8. motor-driven brake actuator as described in claim 1, it is characterised in that: lubricating cup (20) is located at hydraulic pump (31)
Top.
9. a kind of braking method of motor-driven brake actuator, it is characterised in that: include:
Step S1: brake pedal is stepped on, and control system rotates motor (7) according to the signal of sensor, and drive is mounted on motor
(7) gear I (5) rotation on output shaft；
Step S2: gear I (5) rotation drives gear II (4) rotation being engaged with, ball screw nut (24) and gear II
(4) it is interference fitted into and rotates together, realize that ball screw axis (2) horizontally slip, when braking, ball screw axis (2) slides to the left；
Limited screw (8) is together by a threaded connection with relay piston III (22) and slides left and right；
Step S3: brake fluid respectively enters chamber I, chamber IV through oil inlet from lubricating cup (20), and through cup seal I (12), cup-shaped
Sealing element II (14) reaches chamber II；
Step S4: ball screw axis (2) slides to the left, and relay piston III (22) is driven to slide together to the left with limited screw (8)
Dynamic, limited screw (8) slides to the left, the space compression chamber III, leads to the hydraulic increase of chamber III, and brake fluid is pressed into chamber through (10a) mouth
II since relay piston III (22) moves downward compression chamber II, leads to hydraulic increase at the same time, and chamber II brake fluid is from fuel-displaced
Mouth II 29b output；
Step S5: relay piston I (10), relay piston II (16) is attached by piston fixed pin (11), relay piston I
(10), relay piston II (16), piston fixed pin (11) three slide left and right together, the piston limit of relay piston II (16)
The sliding scale of dynamic pin (13) limitation relay piston II (16), prevents relay piston II (16) from excessively sliding to the right；It is outstanding as a result,
It is when intelligent hydraulic force aid system fails, and when being braked using fluid pressure type, when a thrashing, prevents another system
Failure, starting protection effect；
Step S6: brake pedal release releases braking, and control system turns motor (7) reversely according to the signal of Hall sensor
It is dynamic, drive gear I (5) rotation being mounted on motor (7) output shaft；Gear I (5) rotation drives the gear II being engaged with
(4) it rotates, ball screw nut (24) is pressed to gear II (4) interference and rotated together, and realizes that ball screw axis (2) are slided to the right
It is dynamic；At this point, relay piston III (22) left pressure is greater than right side, relay piston III (22) is also slided to the right together, resets bullet
Spring II (9) gradually resets, and spring force gradually reduces, at this point, piston component left pressure is greater than right atrial pressure, piston component is to the right
Slideslip, chamber V, chamber II, the hydraulic reduction of chamber III, brake fluid are back to chamber V, chamber II, chamber III, lubricating cup (20) release from oil outlet
Brake fluid is supplemented to chamber IV, chamber I, chamber IV, chamber I are supplemented brake fluid by cup seal I (12), cup seal II (14)
To chamber V, chamber II, chamber III, it is finally reached original state；
Successively execute step S1- step S6.
10. the braking method of motor-driven brake actuator as claimed in claim 9, it is characterised in that: with piston component
As object, when not starting braking, piston component is in the leftmost side, and the power that reset spring I (17) acts on piston component is greater than
Equal to the power that reset spring II (9) acts on piston component；When braking, relay piston III (22) compression chamber II and reset to the left
Spring II (9), when pressure is greater than left side pressure on the right side of piston component, piston component slides to the left, compression chamber V,
Lead to hydraulic increase, chamber V brake fluid is exported from oil outlet I (29a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811198946.8A CN109204282A (en) | 2018-10-15 | 2018-10-15 | A kind of motor-driven brake actuator and its braking method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811198946.8A CN109204282A (en) | 2018-10-15 | 2018-10-15 | A kind of motor-driven brake actuator and its braking method |
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| Publication Number | Publication Date |
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| CN109204282A true CN109204282A (en) | 2019-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811198946.8A Withdrawn CN109204282A (en) | 2018-10-15 | 2018-10-15 | A kind of motor-driven brake actuator and its braking method |
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| Country | Link |
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| CN (1) | CN109204282A (en) |
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Application publication date: 20190115 |