CN102182775B - Brake actuating mechanism for distributed electronic hydraulic brake system of automobile - Google Patents
Brake actuating mechanism for distributed electronic hydraulic brake system of automobile Download PDFInfo
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- CN102182775B CN102182775B CN 201110095263 CN201110095263A CN102182775B CN 102182775 B CN102182775 B CN 102182775B CN 201110095263 CN201110095263 CN 201110095263 CN 201110095263 A CN201110095263 A CN 201110095263A CN 102182775 B CN102182775 B CN 102182775B
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Abstract
The invention relates to a brake actuating mechanism for a distributed electronic hydraulic brake system of an automobile, and belongs to the technical field of automobile manufacturing. The mechanism comprises a shell, a piston, a driving device, a direct current motor, a solenoid valve and an oil can; the shell comprises a right end surface, a step hole consisting of a left round hole, a middle round hole and a right round hole and an oil storage cavity separated by the step hole; the piston and the driving device are arranged in the step hole; a brake oil cavity is formed by the piston and the left round hole; the piston is connected with the driving device; the driving device is connected with the direct current motor; the solenoid valve and the oil can are respectively arranged at the outer sides of the shell; the oil storage cavity is communicated with the oil can; the lower part of the oil storage cavity and the upper surface which is close to the left end of the brake oil cavity are respectively provided with a horizontal through hole and a vertical through hole which are communicated with the solenoid vale; and oil outlet holes and safety holes are respectively arranged on the left surface of the brake oil cavity and below the wall of the intermediate round hole. The brake actuating mechanism provided by the invention has a simple and compact structure, can rapidly establish brake hydraulic pressure, and is beneficial for shortening the brake distance and increasing the running safety.
Description
Technical field
The present invention relates to the brake actuator for the automobile distribution EHB, belong to field of automobile.
Background technique
The structure of traditional hydraulic braking system for automobile, comprise brake petal, vacuum booster, master cylinder, hydraulic control unit and electronic control unit be connected each wheel break, connect master cylinder is connected braking line and is connected hydraulic control unit and each wheel drag with hydraulic control unit braking line.Producing braking intention from the driver has the time lag of 0.3s～1.0s usually to driver's the foot brake petal of stepping on, and is called during this period of time reaction time of driver.The driver steps on after the brake petal, along with the reach of brake petal, vacuum booster carries out power-assisted to driver's muscle power, promotes the master cylinder piston reach, after the gap in the master cylinder and brake clearance elimination, just can in the break of each wheel, produce brake fluid pressure.
The line control brake system of automobile is a kind of brake system of car that grows up gradually over nearly 20 years.All braking functions that perfect line control brake system not only can provide the traditional braking system to provide, and more meet automotive safety and energy-conservation requirement.The brake petal of line control brake system and brake actuator are decoupling zeros, there are not direct machinery and/or hydraulic connecting between the two, step on the action of brake petal by pedaling force and/or pedal travel (pedal corner) sensor senses driver, judge driver's braking intention, perhaps be independent of the driver by radar, various onboard sensor and judge on one's own initiative braking requirement, by brake actuator vehicle is implemented braking.During conventional brake, line control brake system can provide and the on all four Braking efficiency of traditional braking system and brake feel, both can guarantee the brake safe of vehicle, the brake feel that can guarantee again the line control brake system that the driver experiences is consistent with the brake feel of accustomed traditional braking system, thereby is unlikely to cause flurried even misoperation because of the difference of brake feel.When the vehicle dangerous situation such as be about in the process of moving bump, when needing braking to intervene, because can being independent of the driver, line control brake system implements voluntarily braking, and compare with the traditional braking system and to have cancelled reaction time of driver, rate of pressurization is compared the traditional braking system also can be faster, vehicle line control brake system under dangerous situation can be taked action prior to driver's reaction and action like this, has improved the Security of driving.This function that can be independent of driver's automatic brake of line control brake system is highly suitable in the intelligent automobile that need not driver's braking it and uses.In addition, system compares with traditional braking, and the decoupling zero of line control brake system pedal and the adjustable characteristics of braking force fast and flexible make it more be fit to the new energy car use that mixed power electric car (especially deep hybrid power automobile), pure electric automobile etc. have the regenerative braking function.When being used for these new energy cars, compare line control brake system with the traditional braking system and can carry out better coordination with the regenerative braking system: the size of regulating hydraulic braking force according to the big or small fast and flexible of regenerative braking power, guaranteed two overall severities of braking of braking system of vehicle regenerative braking and hydraulic braking, the pedal decoupling zero provides the pedal sense identical with the traditional braking system for the driver.So just, can guarantee recovery braking energy as much as possible on the basis of brake safe, farthest reduce the driving energy consumption, improve the economical of automobile running.
Line control brake system mainly is divided into two large classes: electro-hydraulic brake (Electro-hydraulic Brake is called for short EHB) and electric mechanical braking (Electro-mechanical Brake is called for short EMB).EMB adopts motor as a kind of distributed line control brake system of power source, the shortcoming that the EMB system exists at present is: because motor is near the wheel limit, its working environment very severe, the motor temperature variation can reach 200 ℃ in the course of the work, if use magneto, will cause the motor torque constant to change 20% to 25%, motor material also must can bear larger vibratory impulse simultaneously.This also is the key factor that restriction EMB puts goods on the market.
EHB has two kinds of technological schemes.The first technological scheme of EHB is to use electronic control unit (Electronic Control Unit, be called for short ECU) control hydraulic control unit (Hydraulic Control Unit, be called for short HCU), this technological scheme is to (the Anti-lock Braking System of widely used antilock braking system (ABS) on the present automobile, be called for short ABS) and electronic stability controlling system (Electronic Stability Control, abbreviation ESC) extension and the expansion on 26S Proteasome Structure and Function had the comparatively ripe product of this technological scheme at present abroad.The advantage of this technological scheme is structurally to be close with present ABS, the ESC system based on ECU and HCU, and this makes things convenient for manufacturer to use manufacturing equipment and the technology of ABS and ESC maturation.But also there are some shortcomings in this technology path: one, in order to obtain higher pressure estimation precision and pressure control quality, in a cover EHB system, need to adopt more pressure transducer and linear scale valve, used 6 pressure transducers and 6 linear scale valves such as first generation EHB system of Toyota Company (name is called ECB), this will significantly increase the cost of system.If two reduce the number of pressure transducer and linear scale valve in order to control cost, for example Toyota Company's second generation EHB is reduced to 2 with the number of pressure transducer and linear scale valve, will cause again the decline of limited conditions downforce estimation precision and control quality.Three, there is certain potential safety hazard in this kind technology path, and the accumulator nitrogen of this kind technological scheme of describing in SAE Paper2003-01-0324 such as Delphi company is revealed the problem that lost efficacy and may cause etc.Quality problems also appearred in the product of this kind technology path in actual use really, just once recalled because of the safety problem that occurs in the using process such as the EHB of Bosch company this kind technology path.
The second technological scheme of EHB is distributed electronic hydraulic brake system.In distributed electronic hydraulic brake system, each wheel is equipped with a brake actuator, by ECU control brake actuator vehicle is implemented braking.Brake actuator adopts motor driving, and by movement conversion mechanism motor being rotatablely moved becomes straight line motion, implements braking thereby pushing piston is pressed into wheel cylinder with brake fluid.This technological scheme is owing to having adopted the distributed frame of EMB, relatively adopt and concentrate EHB the first technological scheme of power source to have higher Security, and owing to adopting electro-hydraulic brake, motor arrangement is above suspending of vehicle, avoid the EMB motor in the rugged environment that the wheel limit faces, greatly improved reliability.This technological scheme is studied lessly at present abroad, only has Delphi company (Delco company originally) to carry out correlative study abroad known at present.Brake actuator is the key components of the EHB of this technological scheme, the brake actuator that Delphi company proposes has following characteristics: use the low torque motor of high rotating speed as power source, motor is slowed down to increase by 5: 1 gear pair of reduction speed ratio and turns round, by lead screw pair the rotation of motor is become translation, promote hydraulic cylinder piston and brake fluid is pressed into wheel cylinder wheel is implemented braking.The main structure of this brake actuator comprises motor, slows down to increase and turn round gear pair, ball screw pair (comprising leading screw and nut), piston, oil hydraulic cylinder, bearing, housing, oil can etc.Slow down and increase the complexity that the use of turning round gear pair has increased this scheme structure.At home, only have at present Tsing-Hua University and Wuhan Yuan Feng to cooperate distributed electronic hydraulic brake system has been launched correlative study, submit patent application " vehicle electromechanical hydraulic braking system " (ZL 200920110660.x), " a kind of vehicle electromechanical hydraulic braking system " (ZL 200920110661.4) in 2009, and manufactured experimently the model machine of brake actuator according to the patent of submitting.The structure of this model machine comprises motor, ball screw pair (comprising leading screw and nut), piston, oil hydraulic cylinder, push rod, link, connecting bolt, guide rail etc.For simplied system structure, this scheme is directly selected moment of torsion and the suitable motor of rotating speed according to the vehicle of mating, and having cancelled slows down to increase turns round gear pair.This scheme is used link and push rod attaching nut and piston, and link then is to be connected flange with nut by connecting bolt to connect, and structure is comparatively complicated and cause the system axial longer dimension.This scheme uses guide rail that nut is implemented guiding and anti-rotation constraint, takes up room larger.
Summary of the invention
The objective of the invention is for overcoming the deficiency of prior art, a kind of brake actuator for the automobile distribution EHB is proposed, this brake actuator is simple and compact for structure, reliability and durability, for the industrialization of distributed electronic hydraulic brake system is laid a solid foundation.
Described brake actuator for the automobile distribution EHB, this brake actuator comprises housing, the piston with seal ring, piston driver, direct current generator, solenoid valve, with the oil can of seal ring, it is characterized in that, described housing comprises that the interior step hole that is comprised of the left, center, right circular hole that forms of the right side, the housing that have center hole reaches the shoe cream room that cuts off with this step hole level; Should place the left circular hole of housing with the piston of seal ring, this piston driver places housing circular hole and right circular hole; Be somebody's turn to do left end and the left circular hole formation of housing brake oil chamber with the piston of seal ring, this right-hand member with the piston of seal ring links to each other with piston driver, this piston driver links to each other with the direct current generator that is installed in the housing right side, and the oil can that this solenoid valve reaches with seal ring is installed in respectively in the mounting hole of this hull outside; This shoe cream room is connected with oil can with seal ring, this shoe cream room bottom has the horizontal through hole that is connected with solenoid valve left, this is close left end above braking oil pocket, have the vertical through hole that is connected with solenoid valve, this vertical through hole and horizontal through hole consist of the oil duct that arrives the braking oil pocket from shoe cream room through solenoid valve, and this brakes oil pocket left side, have the oil outlet of level, the left bottom of circular hole wall in housing has and leads to the outer vertical safety vent of housing.
Described piston driver comprises ball screw pair, pair of bearings, sleeve, lock washer, round nut and coupling, this ball screw pair comprises nut, leading screw, this nut is connected with piston with seal ring, this outer ring to bearing is installed in the left end of the right circular hole of housing, this left side to the left bearing outer ring of bearing is pressed on the boss of the right circular hole of housing and the formation of middle circular hole, the left side of this sleeve is pressed on this right side to the right bearing outer ring of bearing, the shell of this direct current generator is pressed on the right side of sleeve, this leading screw is installed in this in the bearing inner race, and by the leading screw shaft shoulder, lock washer and round nut are fixed, and the end of this leading screw is connected with the output shaft of direct current generator by coupling.
With the nut anti-rotation groove of two symmetries, on mutually should the housing of two nut anti-rotation groove positions, two anti-turn screws be installed on the outer surface of described nut, these two anti-turn screws stretch into respectively in two nut anti-rotation grooves.
With the plane of two symmetries, on mutually should the inner walls of position, two planes, be provided with two planes on the outer surface of described nut.
Described piston with seal ring is also with the piston annular groove, and described nut is with the nut annular groove, and this piston annular groove is connected by snap ring with the nut annular groove.
Characteristics of the present invention and effect:
The brake actuator that is used for the automobile distribution EHB that the present invention proposes, adopt housing, the piston with seal ring, ball screw pair, bearing, sleeve, direct current generator, coupling, solenoid valve, with the structure of the oil can of seal ring, this is simple and compact for structure, reliability and durability; Braking efficiency and the brake feel identical with the conventional hydraulic braking system can be provided when conventional brake, have advantages of that the conventional hydraulic braking system does not possess when emergency braking is used with the new energy car: to compare brake fluid pressure controlled continuously with the conventional hydraulic braking system, brake fluid pressure is set up rapidly, this mechanism receives the emergency brake signal rear electromagnetic valve and just can move, its response time is short, the response time of motor also is Millisecond even shorter, replaced reaction time of driver relatively long in the traditional vacuum power-assisted hydraulic braking sytem, use its hydraulic pressure rate of rise of distributed electronic hydraulic brake system of this brake actuator faster than the hydraulic pressure rate of rise of traditional vacuum power-assisted hydraulic braking sytem, so it is also shorter to reach the time of a certain definite hydraulic pressure, this can save a period of time for the braking overall process again, for shortening the automobile brake distance under the emergency braking operating mode, improving traffic safety has very important effect; Compare in addition the present invention is more suitable for be used to the new-energy automobile with regenerative braking function with the conventional hydraulic braking system, can carry out better coordination with the regenerative braking system, recovery braking energy as much as possible on the basis of reliable braking function is being provided, farthest reduce the driving energy consumption, improve the economical of automobile running.
Description of drawings
Fig. 1 is the embodiment's 1 of brake actuator of the present invention structural representation.
Fig. 2 is the structural representation of ball screw pair among the embodiment 1.
Fig. 3 is the structural representation of piston among the embodiment 1.
Fig. 4 is embodiment 2 structural representation.
Fig. 5 is the schematic diagram of the cross section of the nut of ball screw pair among the embodiment 2 and housing.
Fig. 6 is embodiment 3 structural representation.
Fig. 7 is embodiment 4 structural representation.
Fig. 8 is the contrast schematic diagram that uses the hydraulic pressure growth curve of the distributed electronic hydraulic brake system of brake actuator of the present invention and traditional vacuum power-assisted hydraulic braking sytem under the emergency braking operating mode.
Embodiment
Structure and the working procedure of the brake actuator that is used for the automobile distribution EHB that the present invention proposes are described in detail as follows with embodiment by reference to the accompanying drawings:
Embodiment 1
The general structure of the present embodiment as shown in Figure 1, comprises housing 11, the piston 13 with seal ring 14, piston driver, direct current generator 113, solenoid valve 121, with the oil can 119 of seal ring 118; Described housing 11 comprises that the right side that has center hole, the step hole that is comprised of the left, center, right circular hole of housing 11 interior formation reach the shoe cream room 117 that cuts off with this step hole level; Should place left circular hole with the piston 13 of seal ring 14, this piston driver places, right circular hole; Be somebody's turn to do left end and left circular hole formation brake oil chamber 12 with the piston 13 of seal ring 14, this right-hand member with the piston 13 of seal ring 14 links to each other with piston driver, this piston driver links to each other with the direct current generator 113 that is installed in housing 11 right sides, and the oil can 119 that this solenoid valve 121 reaches with seal ring 118 is installed in respectively in the mounting hole of this housing 11 outsides processing; This shoe cream room 117 is connected with oil can 119 with seal ring 118, these shoe cream room 117 bottoms have the horizontal through hole that is connected with solenoid valve 121 left, the outlet end of this horizontal through hole has built-in steel ball 122, this steel ball 122 is used for blocking horizontal through hole, prevent that the brake fluid in this shoe cream room 117 from flowing out housing 11, this is close left end above braking oil pocket 12, have the vertical through hole that is connected with solenoid valve 121, this vertical through hole and horizontal through hole consist of the oil duct 120 that arrives braking oil pocket 12 from shoe cream room 117 through solenoid valve 121, these braking oil pocket 12 left sides, have the oil outlet 123 of level, left bottom at middle circular hole wall, have the vertical safety vent 15 that leads to outside the housing 11, if the brake fluid in the braking oil pocket 12 leaks because of poor sealing, can flow out housing 11 by safe through hole 15, avoid other parts of this housing 11 inside are polluted.
The structure of described piston driver, such as Fig. 1, shown in Figure 2, comprise ball screw pair, pair of bearings 110, sleeve 116, lock washer 111, round nut 112 and coupling 115, this ball screw pair comprises nut 18, leading screw 16, this nut 18 is connected with piston 13 with seal ring 14, this outer ring to bearing 110 is installed in the left end of right circular hole, this left side to the left bearing outer ring of bearing 110 is pressed on the boss of right circular hole and the formation of middle circular hole, this bearing 110 is pair of horns contact ball bearings of installing in back-to-back mode, also can select bearing and the mounting type of other suitable species, the left side of this sleeve 116 is pressed on this right side to the right bearing outer ring of bearing 110, the shell of this direct current generator 113 is pressed on the right side of sleeve 116, this leading screw 16 is installed in this in bearing 110 inner rings, and by leading screw 16 shaft shoulders, lock washer 111 and round nut 112 are fixing, and the end of this leading screw is connected with direct current arbor 114 by coupling 115.The thrust that this bearing 110 is subject to leading screw 16 passes to sleeve 116, the inwall of the outer wall of this sleeve 116 and housing 11 is gap or transition fit, the thrust that this sleeve 116 is subject to bearing 110 passes to the shell of direct current generator 113, the shell of direct current generator 113 is connected by the right side of connecting bolt with this housing 11, and this thrust finally acts on the connecting bolt.
On the outer surface of described nut 18 with the nut anti-rotation groove 182 of two symmetries, as shown in Figure 2, when rotatablely moving of direct current arbor 114 drives piston 13 by ball screw pair carry out straight reciprocating motion in braking oil pocket 12, in order to prevent that this nut 18 from rotating, on the outer surface of this nut 18, process two symmetrical nut anti-rotation grooves 182 along bus, on mutually should the housing of two nut anti-rotation groove 182 positions, two anti-turn screws 19 are installed, two anti-turn screws 19 stretch into respectively in two nut anti-rotation grooves 182, realize constraint that this nut 18 is rotated with this.
Described piston 13 with piston packing 14 is also with piston annular groove 131, as shown in Figure 3, described nut is with nut annular groove 181, as shown in Figure 2, this piston annular groove 131 has formed complete annular groove with this nut annular groove 181, in order to the snap ring 17 of packing into therein, like this, this nut 18 is connected by this snap ring 17 with this piston 13, make this piston 13 can be under the drive of nut 18, linear reciprocating motion in braking oil pocket 12 is realized the adjusting of brake fluid pressure, and automobile is implemented braking.In order to form this braking oil pocket 12, on piston 13, piston packing 14 to be installed, this piston packing 14 can choice for use Yx RunddichtringO, so that reliable sealability to be provided, also can select the suitable piston packing of other types.
The performance parameter of described direct current generator 113 should be selected according to the applied concrete vehicle of brake actuator.
The working procedure of brake actuator of the present invention:
Described solenoid valve 121 is normally open solenoid valves, when not braking, and these solenoid valve 121 outages, shoe cream room 117 and braking oil pocket 12 are communicated with, brake fluid pressure in this braking oil pocket 12 equals the brake fluid pressure in this shoe cream room 117, is atmospheric pressure, not action of direct current generator 113; During braking, solenoid valve 121 energisings, valve closing, cut off the connection of shoe cream room 117 and braking oil pocket 12, direct current generator 113 energising and forward rotation, drive leading screw 16 forward rotation by coupling 115, make forward straight line motion of nut 18, the brake fluid that pushing piston 13 will be braked in the oil pocket 12 pushes in the braking line and brake cylinder in brake actuator downstream, automobile is implemented braking, can obtain the brake fluid pressure of different sizes by control direct current generator 113, satisfy the needs of different braking intensity; After automobile brake is finished, direct current generator 113 outages, compressed high hydraulic brake fluid pushing piston 13 and nut 18 reverse translations in braking oil pocket 12 and brake actuator downstream braking line and the brake cylinder, so the braking force of brake fluid pressure and automobile has just reduced, if necessary, can also give direct current generator 113 energisings, and make direct current generator 113 backward rotation, drive leading screw 16 backward rotation by coupling 115, make backward translation of nut 18, the backward translation of pulling piston 13 increases the volume of braking oil pocket 12, thereby implements decompression; Last solenoid valve 121 outages, the working procedure of end brake actuator.In addition, during braking, by 113 energising outage and the clockwise and anticlockwise of control direct current generator, can realize the required supercharging of the system works such as ABS, ESC, pressurize, decompression action, thereby realize the function of the systems such as ABS, ESC.
Traditional vacuum power-assisted hydraulic braking sytem produces braking intention by the driver has retard time of 0.3s～1.0s, i.e. reaction time of driver to driver's brake petal of stepping on.After this, owing at first will eliminate gap in the master cylinder and the gap of break, then brake fluid pressure could begin to increase, and this needs a period of time again, i.e. the action time of break.If take moment of producing the braking intention as initial point, so, as shown in Figure 8, it is t2 that traditional vacuum power-assisted hydraulic braking sytem hydraulic pressure increases zero-time, and is stable at target hydraulic at time t4.During conventional brake, use the distributed electronic hydraulic brake system of brake actuator of the present invention can provide and the on all four Braking efficiency of traditional vacuum power-assisted hydraulic braking sytem and brake feel, namely making hydraulic pressure increase zero-time by control solenoid valve and motor is t2, and makes hydraulic pressure constantly be stable at target hydraulic in t4.So both be enough to guarantee brake safe, can have guaranteed again that brake feel that the driver experiences and the brake feel of accustomed traditional vacuum energy assisted braking system were consistent, thereby be unlikely to cause flurried even misoperation because of the difference of brake feel.During the emergency braking situation, for safety first, shorten the consideration of stopping distance as far as possible, should set up as early as possible brake fluid pressure.For the distributed electronic hydraulic brake system that uses brake actuator of the present invention, can be by the control of solenoid valve and motor is realized this goal: receive emergency brake signal rear electromagnetic valve 121 and just can move, its response time be 2 milliseconds; The response time of motor also is Millisecond even shorter, replaced reaction time of driver relatively long in the traditional vacuum power-assisted hydraulic braking sytem, owing to having saved the above-mentioned time, the hydraulic pressure growth zero-time of the distributed electronic hydraulic brake system of use brake actuator of the present invention advances to t1 by the t2 of traditional vacuum power-assisted hydraulic braking sytem, saves the time of Δ t1 for the overall process of emergency braking.Owing to using its hydraulic pressure rate of rise of distributed electronic hydraulic brake system of brake actuator of the present invention faster than the hydraulic pressure rate of rise of traditional vacuum power-assisted hydraulic braking sytem, so it is also shorter to reach the time of a certain definite hydraulic pressure, this can save a period of time for the emergency braking overall process again, shown in Δ t2 among Fig. 8.The time of the Δ t1+ Δ t2 that saves altogether shortens the automobile brake distance during for emergency braking, improving traffic safety has very important effect.
Embodiment 2
The structure of the present embodiment, such as Fig. 4, shown in Figure 5, the present embodiment is that from the difference of embodiment's 1 embodiment the restraining structure that prevents nut rotation that designs is different, therefore designed housing 21 and nut 28 also with embodiment 1 in housing 11 slightly different with nut 18.Be embodied as: the present embodiment has been cancelled anti-turn screw 19 and nut anti-rotation groove 182 this anti-rotation restraining structures among the embodiment 1, but process the plane of two symmetries at the outer surface of this nut 28, on housing 21 inwalls of position, plane that mutually should two symmetries, also process (for example mill out or cast out) two corresponding planes, match in plane on housing 21 inwalls and the plane of nut 28, form the contact plane 29 of housing 21 inwalls and nut 28, thereby prevent the rotation of nut 28.Other counter structures of the present embodiment and embodiment 1 are identical with working procedure.
Embodiment 3
The structure of the present embodiment, as shown in Figure 6, the present embodiment and embodiment's 1 difference is to have cancelled snap ring, piston annular groove and nut annular groove, the snap ring that piston 33 and nut 38 do not re-use among the embodiment 1 is connected, but realizes both being connected by the interference fit between described piston 33 and the described nut 38.Interference fit between piston 33 and the nut 38 realizes by cold charge technique: piston 33 is dropped into cooling liquids (such as liquid nitrogen) thus in the regular hour radial dimension of piston 33 is shunk, then just piston 33 can be inserted in the nut 38, be returned to original radial dimension along with the answer of temperature in piston 33, piston 33 has just been realized interference fit with nut 38, and both just have been connected.Certainly, can also adopt and the interference fit that other suitable methods realize pistons 33 and nut 38 such as press-fit.Other counter structures of the present embodiment and embodiment 1 are identical with working procedure.
Embodiment 4
The structure of the present embodiment, as shown in Figure 7, the present embodiment and embodiment's 2 difference is to have cancelled snap ring, piston annular groove and nut annular groove, the snap ring that piston 43 and nut 48 do not re-use among the embodiment 2 is connected, but realizes both being connected by the interference fit between described piston 43 and the described nut 48.The method of interference fit is identical with the method that embodiment 3 adopts.Other counter structures of the present embodiment and embodiment 2 are identical with working procedure.
Should be noted that at last, above embodiment is only unrestricted in order to technological scheme of the present invention to be described, although with reference to concrete mode of execution the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technological scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (5)
1. brake actuator that is used for the automobile distribution EHB, this brake actuator comprises housing, the piston with seal ring, piston driver, direct current generator, solenoid valve, with the oil can of seal ring, it is characterized in that, described housing comprises that the interior step hole that is comprised of the left, center, right circular hole that forms of the right side, the housing that have center hole reaches the shoe cream room that cuts off with this step hole level; Should place the left circular hole of housing with the piston of seal ring, this piston driver places housing circular hole and right circular hole; Be somebody's turn to do left end and the left circular hole formation of housing brake oil chamber with the piston of seal ring, this right-hand member with the piston of seal ring links to each other with piston driver, this piston driver links to each other with the direct current generator that is installed in the housing right side, and the oil can that this solenoid valve reaches with seal ring is installed in respectively in the mounting hole of this hull outside; This shoe cream room is connected with oil can with seal ring, this shoe cream room bottom has the horizontal through hole that is connected with solenoid valve left, this is close left end above braking oil pocket, have the vertical through hole that is connected with solenoid valve, this vertical through hole and horizontal through hole consist of the oil duct that arrives the braking oil pocket from shoe cream room through solenoid valve, and this brakes oil pocket left side, have the oil outlet of level, the left bottom of circular hole wall in housing has and leads to the outer vertical safety vent of housing.
2. brake actuator as claimed in claim 1, it is characterized in that, described piston driver comprises ball screw pair, pair of bearings, sleeve, lock washer, round nut and coupling, this ball screw pair comprises nut, leading screw, this nut is connected with piston with seal ring, this outer ring to bearing is installed in the left end of the right circular hole of housing, this left side to the left bearing outer ring of bearing is pressed on the boss of the right circular hole of housing and the formation of middle circular hole, the left side of this sleeve is pressed on this right side to the right bearing outer ring of bearing, the shell of this direct current generator is pressed on the right side of sleeve, this leading screw is installed in this in the bearing inner race, and by the leading screw shaft shoulder, lock washer and round nut are fixed, and the end of this leading screw is connected with the output shaft of direct current generator by coupling.
3. brake actuator as claimed in claim 2, it is characterized in that, on the outer surface of described nut with the nut anti-rotation groove of two symmetries, on mutually should the housing of two nut anti-rotation groove positions, two anti-turn screws are installed, and these two anti-turn screws stretch into respectively in two nut anti-rotation grooves.
4. brake actuator as claimed in claim 2 is characterized in that, with the plane of two symmetries, on mutually should the inner walls of position, two planes, be provided with two planes on the outer surface of described nut.
5. brake actuator as claimed in claim 2 is characterized in that, described piston with seal ring is also with the piston annular groove, and described nut is with the nut annular groove, and this piston annular groove is connected by snap ring with the nut annular groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110095263 CN102182775B (en) | 2011-04-15 | 2011-04-15 | Brake actuating mechanism for distributed electronic hydraulic brake system of automobile |
Applications Claiming Priority (1)
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| CN 201110095263 CN102182775B (en) | 2011-04-15 | 2011-04-15 | Brake actuating mechanism for distributed electronic hydraulic brake system of automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102490711B (en) * | 2011-11-30 | 2013-10-23 | 清华大学 | Distributed type electronic hydraulic brake system using isolating valves |
| CN103144625A (en) * | 2013-03-26 | 2013-06-12 | 清华大学 | Integrated vehicle-braking executing device adopting solenoid valve |
| CN103148134A (en) * | 2013-03-26 | 2013-06-12 | 清华大学 | Integrated braking executing mechanism adopting solenoid valve |
| CN104057936B (en) * | 2014-06-09 | 2016-03-30 | 清华大学 | A kind of integrated type electrical hydraulic brake system actuating unit |
| CN105691374A (en) * | 2016-01-28 | 2016-06-22 | 江苏大学 | Heavy-duty car motor drive air braking system and braking method |
| CN107738639A (en) * | 2017-09-11 | 2018-02-27 | 浙江零跑科技有限公司 | A kind of electric car bevel gear type braking executive device and method |
| CN108749802A (en) * | 2018-07-19 | 2018-11-06 | 宁波拓普智能刹车系统有限公司 | A kind of electric cylinders structure of integrated electrical control braking force aid system |
| CN111071227A (en) * | 2019-12-26 | 2020-04-28 | 苏州科美澄汽车科技有限公司 | Decoupling electromechanical and hydraulic integrated brake power-assisted system |
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| JPS60124560U (en) * | 1984-01-30 | 1985-08-22 | 株式会社 日本気化器製作所 | vaporizer |
| US5945749A (en) * | 1998-06-10 | 1999-08-31 | Westinghouse Air Brake Company | On-board electrical power generator operated by vibration or compressed air |
| US6991075B2 (en) * | 2002-07-24 | 2006-01-31 | Delphi Technologies, Inc. | Electrically actuated disc brake assembly |
| EP1619398B1 (en) * | 2004-07-23 | 2007-05-02 | Siemens Aktiengesellschaft | Positioning device, especially motor vehicle parking brake |
| CN202040243U (en) * | 2011-04-15 | 2011-11-16 | 清华大学 | Brake actuating mechanism for automobile distributed electronic hydraulic brake system |
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