CN105799678B - The brake booster and motor vehicle braking system of hydraulic braking power-assisted are provided - Google Patents
The brake booster and motor vehicle braking system of hydraulic braking power-assisted are provided Download PDFInfo
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- CN105799678B CN105799678B CN201410841748.4A CN201410841748A CN105799678B CN 105799678 B CN105799678 B CN 105799678B CN 201410841748 A CN201410841748 A CN 201410841748A CN 105799678 B CN105799678 B CN 105799678B
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Abstract
Disclosing a kind of motor vehicle braking system and its brake booster, the brake booster includes power brake liquid source and hydraulic braking power-assisted transmitting element.When the vehicle is braked, pedal-driven is braked in response to pedal brake force transmission element, power brake liquid is supplied in the brake booster, so that power brake liquid is with certain pressure acts on hydraulic braking power-assisted transmitting element and generates hydraulic braking power-assisted, hydraulic braking power-assisted is transmitted to the braking executive component by the hydraulic braking power-assisted transmitting element.
Description
Technical field
This application involves a kind of brake booster for vehicle, hydraulic braking power-assisted is capable of providing to enhance braking effect
Fruit.The application further relates to the motor vehicle braking system comprising the brake booster.
Background technique
Vehicle generally includes for reducing car speed and/or the braking system for making vehicle stop traveling.Many vehicles exist
Brake booster is increased in braking system, to enhance vehicle braking effect.
The most common traditional braking booster is diaphragm type vacuum booster, loaded on brake pedal and master cylinder it
Between, and vacuum chamber and working chamber including being separated in the housing by diaphragm, vacuum chamber are connected with engine air inlet tube, working chamber
It is communicated with the atmosphere through air valve, is connected between vacuum chamber and working chamber by vacuum valve.In non-brake state, air valve close and
Vacuum valve is opened, thus the pressure in vacuum chamber and working chamber keeps roughly the same, so that diaphragm keeps substantially static.It is braking
State, in response to the power that vehicle driver applies on brake pedal, vacuum valve is closed, and air valve is opened, and air is inhaled into
Working chamber.Therefore, the pressure in working chamber becomes larger than the pressure in vacuum chamber.Pressure between vacuum chamber and working chamber is uneven
It is mobile that weighing apparatus leads to diaphragm, to generate the vacuum servo of a several times bigger than pedal force on master cylinder.In this way, braking master
Cylinder receives pedal force and vacuum servo simultaneously, therefore the output pressure of master cylinder can be improved, to mitigate pedal force.
It can be seen that traditional vacuum brake assistor is helped using the vacuum degree that engine air inlet tube generates to generate braking
Power, therefore, the work of vacuum brake assistor places one's entire reliance upon the operating of engine.When engine misses for any reason
When, vacuum brake assistor will not work.In addition, the operation of vacuum brake assistor in turn also can be to engine itself
Work has some impact on.
Summary of the invention
The application is intended to provide a kind of new-type brake booster, the operation independent of engine.
For this purpose, providing a kind of brake booster in motor vehicle braking system, institute according to the one aspect of the application
State motor vehicle braking system include brake pedal, the pedal brake force transmission element for being braked pedal-driven, from pedal brake power pass
The braking executive component that element receives pedal brake power is passed, the brake booster includes hydraulic braking power-assisted transmitting element,
It is configured to that on the one hand brake boost can be generated by the effect of power brake liquid, on the other hand brake boost can be passed
It is delivered to the braking executive component；Wherein, when the vehicle is braked, pedal is braked in response to pedal brake force transmission element to drive
Dynamic, power brake liquid is supplied in the brake booster, so that power brake liquid acts on hydraulic braking power-assisted with certain pressure
Transmitting element and generate hydraulic braking power-assisted, hydraulic braking power-assisted is transmitted to the system by the hydraulic braking power-assisted transmitting element
Dynamic executive component.
According to a kind of embodiments possible, the pedal brake power and hydraulic braking power-assisted are passed through public reaction member
It is delivered to braking executive component.
According to a kind of embodiments possible, the pedal brake power is applied to the first part of the reaction member,
The hydraulic braking power-assisted is applied to the second part of the reaction member.
According to a kind of embodiments possible, the reaction member is reaction plate, and the pedal brake power is applied to
The inboard portion of the reaction plate, the hydraulic braking power-assisted are applied to the exterior portion of the reaction plate.
According to a kind of embodiments possible, the brake booster further includes for detecting pedal brake force transmission element
The motion detection apparatus of movement, the brake booster judge the brake operating of vehicle by the testing result of motion detection apparatus
State to start the supply of power brake liquid in the initial brake stage, and stops power-assisted system in terminating the deboost phase
The supply of hydrodynamic.
According to a kind of embodiments possible, the motion detection apparatus includes: to be carried by pedal brake force transmission element
Signal generating element, the signal that the signal generating element issues change with the movement of pedal brake force transmission element；With
Detect the signal detection component of the signal intensity of the signal generating element.
According to a kind of embodiments possible, the signal generating element is magnet, and the signal issued is magnetic field, the letter
Number detecting element is detection magnetic field changing magnetic field detecting element.
According to a kind of embodiments possible, the pedal brake force transmission element includes the plunger being axially movable, described
Hydraulic braking power-assisted transmitting element includes the valve body being axially movable, and the plunger and the valve body cooperate, so that effectively making
In the dynamic stage, plunger axial movement synchronous with the valve body.
According to a kind of embodiments possible, the positional relationship between the plunger and the valve body is arranged so that, first
Begin in the deboost phase, the valve body described first applies hydraulic braking power-assisted to braking executive component, and then the plunger is held to braking
Units apply pedal brake power.
According to a kind of embodiments possible, relief hole is formed in the plunger, the relief hole is arranged in the following manner:
When vehicle starts braking, the plunger is moved relative to the valve body along first axial direction, so that the relief hole is by institute
Valve body closing is stated, thus power brake liquid acts on valve body with high pressure；When vehicle terminates braking, the plunger is relative to described
Valve body is moved along the second opposite axial direction, so that the relief hole is no longer closed by the valve body and opened, thus is acted on
It is released from the power brake hydraulic coupling of valve body.
According to a kind of embodiments possible, the valve body is equipped with elastic element facing to the position of the plunger at it, excellent
It is selected as elastic ring piece, the positional relationship between the plunger, the elastic element and the valve body is arranged so that, initial
Deboost phase, when the plunger relative to the valve body along first axial direction move first axis apart from when, the plunger
The elastic element is touched, later, the elastic element is compressed axially by the plunger, when the plunger is relative to the valve
When body moves the second axial distance greater than the first axis distance along first axial direction, the relief hole is by the valve
Body is closed.
According to a kind of embodiments possible, the brake booster further includes shell, and pressurization is separated out in the shell
Chamber and pressure-releasing chamber, the valve body are arranged in the pressurizing chamber, and power brake liquid, and the pressurization is supplied in the pressurizing chamber
On-off is realized by the opening and closing of the relief hole between chamber and pressure-releasing chamber.
According to a kind of embodiments possible, the brake booster further includes that the plunger being fixedly mounted in the shell is led
To part, for guiding the axial movement of the plunger.
According to a kind of embodiments possible, the plunger guide part is also used to separate the pressurizing chamber and pressure-releasing chamber.
According to a kind of embodiments possible, elasticity is equipped between the plunger guide part and the corresponding site of the plunger
Reset element, for by the plunger towards the Elastic pusher in situ under non-brake state.
According to further aspect of the application, a kind of motor vehicle braking system is provided, comprising: brake pedal；It is braked and steps on
The pedal brake force transmission element of plate driving；Previously described brake booster；Power brake liquid source, to the brake boost
Device provides power brake liquid；And from pedal brake force transmission element receive pedal brake power and from the liquid of brake booster
Brake boost transmitting element is pressed to receive the braking executive component of hydraulic braking power-assisted.
According to a kind of embodiments possible, the motor vehicle braking system further includes braking force distribution system, and braking is held
The pedal brake power and hydraulic braking power-assisted that units receive are assigned to brake wheel.
According to a kind of embodiments possible, the braking force distribution system is hydraulic distribution system or mechanical distribution system
System or mechanical/hydraulic combined distribution system；The braking executive component can be hydraulic distribution system or mechanical/hydraulic group
Close the main piston of the master cylinder of distribution system.
According to a kind of embodiments possible, power brake liquid source can be the ESP pump of vehicle.
According to the application, brake boost, therefore, this Shen are provided using hydraulic rather than engine air inlet tube vacuum degree or motor
Operation of the operation of brake booster please independent of engine, so as to avoid vacuum brake assistor in the prior art
Existing limitation provides a kind of beneficial selection for the brake boost scheme of motor vehicle braking system.
Detailed description of the invention
Fig. 1 is the cross-sectional view according to a kind of a part of the motor vehicle braking system of embodiments possible of the application；
Fig. 2-9 is the cross-sectional view of some main elements in the brake booster of the motor vehicle braking system of the application；
Figure 10 is partial sectional view of the brake booster of the application under non-brake mode of operation；
Figure 11 is partial sectional view of the brake booster of the application under braking operation state.
Specific embodiment
The embodiments possible of the application is described with reference to the accompanying drawings.
As shown in Figure 1, a kind of motor vehicle braking system according to the application specifically includes that master cylinder 1, by from being not shown
Brake fluid reservoir supply brake fluid；Push rod 2 is connect with unshowned brake pedal, and pedal-driven can be braked and
The pedal brake power from brake pedal is transmitted to the main piston 3 of master cylinder 1；Braking divides cylinder (not shown), they and braking
Master cylinder 1 is connected, and the brake fluid of the supply pressurization of master cylinder 1 is braked in 3 actuation of main piston, to carry out to corresponding wheel
Braking.
The motor vehicle braking system of the application further includes brake booster, is limited along the central axis by master cylinder 1
Be disposed axially between brake pedal and master cylinder 1, the structure of the brake booster will be described below.It needs first
It is to be noted, that the direction in order to indicate each element, in this application, " rear " refer in the direction or position close to push rod 2, " preceding "
Refer to away from push rod 2, i.e. close to the direction or position of master cylinder 1.
As shown in Figure 1, the brake booster of the application specifically includes that shell 4, it in forward end seal is fixed on braking master
Cylinder 1, and the rear portion of main piston 3 is protruded into shell 4；Reaction plate 5, plunger plate 6 and the valve body 7 carried by main piston 3, wherein
Reaction plate 5 acts on main piston 3, and plunger plate 6 and valve body 7 are respectively facing to the different piece of reaction plate 5, such as diagram
Inboard portion and exterior portion；The valve collar 8 carried by valve body 7；The plunger 9 being axially movable carried by shell 4, wherein push rod
In 2 insertion plungers 9, and it can be moved in plunger 9, such as the sliding block 10 of the front end by means of support push rod 2；Fixedly cloth
The plunger guide part 11 in shell 4 is set, be used to support and plunger 9 is guided to move axially in shell 4；It is arranged in shell 4
For applying the reset spring 12 of reset force axially backward to plunger 9, be placed in plunger guide in the example in the figures
Between part 11 and the corresponding site of plunger 9；The magnet 13 being mounted on plunger 9；Position detecting element 14 passes through detection magnet
13 changes of magnetic field and the axial position for determining plunger 9.
The structure of above-mentioned some main elements is shown in Fig. 2-9.It may be noted that these figures were not necessarily drawn to scale.
These elements are described referring to Fig. 2-9 and in conjunction with Fig. 1.
As shown in Fig. 2, master cylinder 1 have can in its cylinder body main piston 3 in axial sliding, the direction of the main piston 3
The rear section that rear side stretches out has outer peripheral surface 3a and rear end face 3b, and Piston bowl 3c is formed in the rear section, should
Piston bowl 3c is limited by bottom wall 3d and the internal perisporium 3e to be extended back by bottom wall 3d, and towards rear open in main piston 3
Rear end face 3b.Internal perisporium 3e is cylinder (such as cylindrical surface, prismatic surface etc.).Main piston 3 constitutes braking executive component.
As shown in figure 3, reaction plate 5 has front surface 5a, rear surface 5b and outer peripheral surface 5c.Outer peripheral surface 5c and main piston 3
Internal perisporium 3e shape be consistent, reaction plate 5 is placed in the Piston bowl 3c of main piston 3, wherein front surface 5a
Holding is adjacent to bottom wall 3d.Reaction plate 5, such as can be by elastomer preferably by deformable but almost incompressible material is made
Material is preferably made of rubber.
As shown in figure 4, plunger plate 6 have front surface 6a, rear surface 6b, outer peripheral surface 6c, from rear surface 6c projection backward
Boss 6d.Front surface 6a keeps the inboard portion for being closely attached on the rear surface 5b of reaction plate 5.Plunger plate 6 is preferably metalwork.
As shown in figure 5, valve body 7 be it is generally cylindrical, have front surface 7a, rear surface 7b, outer peripheral surface 7c.In addition, in valve body 7
Inside forms the preceding cavity 7d, sliding through hole 7e, rear cavity 7f penetrated through each other from front to back.The radial dimension of sliding through hole 7e is small
In preceding cavity 7d and rear cavity 7f.Valve body 7 is in such a way that its front surface 7a is close to the exterior portion of the rear surface 5b of reaction plate 5
It is placed in the Piston bowl 3c of main piston 3.Outer peripheral surface 7c is consistent with the internal perisporium 3e shape of main piston 3, and along periphery
The circumferential direction of face 7c is formed with sealing element annular groove 7g, for accommodating sealing ring 15 (see Fig. 1), by the outer peripheral surface 7c of valve body 7 and master
It is sealed between the internal perisporium 3e of piston 3.In addition, sealing element annular groove 7h is formed with along the circumferential direction of sliding through hole 7e, for accommodating
Sealing ring 16 (see Fig. 1).In addition, being formed with the annular slot 7j towards rear open in the bottom surface 7i of rear cavity 7f, it is used for
Wherein by the placement of valve collar 8.After reaction plate 5, plunger plate 6, valve body 7 are mounted in Piston bowl 3c as shown in Figure 1, valve
The rear end face 7b of body 7 backward exceed main piston 3 rear end face 3b, preferably with respect to rear end face 3b forward retraction it is a bit of away from
From.
As shown in fig. 6, valve collar 8 is the annular element with certain radial thickness and axial width, by the material of elastically deformable
Material is made, and has front surface 8a, rear surface 8b, outer peripheral surface 8c and inner peripheral surface 8d.The major part including its front of valve collar 8
As shown in Figure 1 in the annular slot 7j of insertion valve body 7, rear portion is stretched out backward by annular slot 7j, is located in rear cavity 7f.
As shown in fig. 7, plunger guide part 11 is in generally cylindrical or dish type, there is front surface 11a, rear surface 11b, outer peripheral surface
11c, the inner peripheral surface 11e for limiting the guide through hole 11d that front and back penetrates through.It is circumferentially formed respectively in outer peripheral surface 11c, inner peripheral surface 11e
There are sealing element annular groove 11f, 11g, for installing sealing ring 17,18 (see Fig. 1).
As shown in figure 8, shell 4 be it is generally cylindrical, have front end face 4a, rear end face 4b and outer peripheral surface 4c.In shell 4
It is logical to be formed with perforation and radial dimension reduce step by step each other pressurizing chamber 4d, pressure-releasing chamber 4e and rear portion along axial direction from front to back for portion
Hole 4f, they are limited by preceding inner peripheral surface 4g, middle inner peripheral surface 4h, rear inner peripheral surface 4i respectively, and between pressurizing chamber 4d and pressure-releasing chamber 4e
The front step 4j towards front side is generated, the backward step 4k towards front side is generated between pressure-releasing chamber 4e and rear through hole 4f.Preceding inner circumferential
Front wall segments 4l is constituted between face 4g and outer peripheral surface 4c, and mesospore section 4m, rear inner peripheral surface are constituted between middle inner peripheral surface 4h and outer peripheral surface 4c
Rear wall section 4n is constituted between 4i and outer peripheral surface 4c.In addition, be formed in front wall segments 4l from outer peripheral surface 4c extend to before inner peripheral surface
4g, the inlet 4o for leading to pressurizing chamber 4d, be formed in mesospore section 4m from outer peripheral surface 4c extend in inner peripheral surface 4h, i.e. logical
To the leakage fluid dram 4p of pressure-releasing chamber 4e.In addition, sealing element annular groove 4q is formed with along the circumferential direction of rear inner peripheral surface 4i, for accommodating sealing
Ring 19 (see Fig. 1).In addition, being formed with outwardly extending mounting flange 4r on outer peripheral surface 4c, it is preferably placed on rear wall section 4n.
Shell 4 is assembled into master cylinder 1 as shown in Figure 1, and the central axis of the two is substantially conllinear.Wherein, the front end of shell 4
Face 4a is hermetically installed on the rear end face of the cylinder body of master cylinder 1.Reaction plate 5, plunger plate are provided in its Piston bowl 3c
6, the main piston 3 of valve body 7 and valve collar 8 is contained in pressurizing chamber 4d.Plunger guide part 11 is fixedly mounted in pressurizing chamber 4d, with it
Rear surface 11b is connected to front step 4j.The outer peripheral surface 11c of plunger guide part 11 is consistent with the shape of the preceding inner peripheral surface 4g of shell 4,
And sealing is realized by sealing ring 17 therebetween, plunger guide part 11 separates pressurizing chamber 4d and pressure-releasing chamber 4e as a result,.Column
Across a bit of axial distance between filling between the front surface 11a of guide part 11 and the rear end face 3b of main piston 3.Preceding inner peripheral surface 4g's
Radial dimension is slightly larger than the outer peripheral surface 3a of main piston 3, to form annular space 20 between (see Fig. 1).Inlet 4o
It is connected to power brake liquid source, such as ESP (electronics body stabilization system) pump or other hydraulic pumps.The annular space 20 makes
The power brake liquid for coming power brake liquid source can enter in pressurizing chamber 4d from power brake liquid source stream.
As shown in figure 9, plunger 9 in generally cylindrical or rodlike, have front end face 9a and since front end face it is engaging one another
It extends back and the first cylinder 9b that radial dimension increases step by step, the second cylinder 9c, third cylinder 9d, the 4th cylinder 9e, these
Cylinder limits the first shell of column 9f, the second shell of column 9g, third shell of column 9h and the 4th shell of column 9i of plunger 9 respectively.In the first cylinder
Intersection between 9b and the second cylinder 9c generates the front step 9j towards front side, the second cylinder 9c and third cylinder 9d it
Between intersection be formed with the pushing and pressing flange 9k to extend radially outwardly, the intersection between third cylinder 9d and the 4th cylinder 9e
It is formed with the stop lug 9l to extend radially outwardly.Magnet 13 is placed in third column between pushing and pressing flange 9k and stop lug 9l
On section 9h.In addition, power brake liquid cavity 9m is formed in the first shell of column 9f and the second shell of column 9g, i.e., by the first shell of column 9f and
Two chamber portions that are axially extending and communicating with each other in two shell of column 9g form.It is formed towards the rear portion inner cavity 9n that rear portion is opened
In the 4th shell of column 9i.Prolong in addition, being formed with one or more close to front step 9j in the first shell of column 9f from the first cylinder 9b
The relief hole 9o in power brake liquid cavity 9m is reached, one or more are formed in the second shell of column 9g and is extended from the second cylinder 9c
To the recirculation hole 9p in power brake liquid cavity 9m.Although it may be noted that plunger 9 is generally shown as the shape of single-piece in figure
Formula, but in practice in order to process, plunger 9 is formed by two even more part combinations of part.Other elements are also such.
Plunger 9 is carried by shell 4 as shown in Figure 1.Wherein, the first shell of column 9f is inserted into the sliding through hole 7e of valve body 7, and second
Shell of column 9g passes through the guide through hole 11d of plunger guide part 11.Reset spring 12 is axially compressed in plunger around the second shell of column 9g
Between guide part 11 and pushing and pressing flange 9k.4th shell of column 9i passes through the rear through hole 4f of shell 4 and exposes from rear end face 4b.Sealing
Ring 19 keeps the sealing between the rear wall section 4n and the 4th shell of column 9i of shell 4.Push rod 2 is inserted into the 9k of rear portion inner cavity, and by
Sliding block 10 in the front end that support push rod 2 can slide axially in the 9k of rear portion inner cavity.Plunger 9 constitutes pedal brake power biography
Pass element.
Under the reset force effect of reset spring 12, plunger 9 in a normal state (grasp without braking by motor vehicle braking system
When making) be located at shown in Fig. 1 near rear position, i.e., in situ, stop lug 9l pushing and pressing at this time are in the backward step 4k of shell 4.?
Under this state, relief hole 9o is located at the axial rear side of the bottom surface 7i of the rear cavity 7f of valve body 7, keeps the pressurizing chamber 4d with shell 4
It communicates.Recirculation hole 9p communicated in this case with the pressure-releasing chamber 4e of shell 4 (and actually plunger 9 move forward when can also
To keep communicating with pressure-releasing chamber 4e).
In addition, position detecting element 14 is mounted on shell 4 in the radial position being generally corresponding to magnet 13, to examine
It surveys magnet 13 and moves axially caused changes of magnetic field.
The operation of the motor vehicle braking system of the application is described referring to Figure 10,11.In both of the figures, for clarity,
Some unnecessary elements are omitted.
The conventional sense (non-brake mode of operation) of motor vehicle braking system is shown in Figure 10, at this time the position of each element and
State is identical as shown in Fig. 1.Wherein, brake pedal is not stepped on by driver, and no pedal brake power is transmitted to through push rod 2
Plunger 9, thus plunger 9 is in (near rear position) in situ under the action of the reset force of reset spring 12.In this state,
Separate first axis distance between the front step 9j of plunger 9 and the rear surface 8b of valve collar 8, the relief hole 9o in plunger 9 is most
Separate the second axial distance, the front end face 9a and plunger plate of plunger 9 between the bottom surface 7i of the rear cavity 7f of rear side position and valve body 7
Separate third axial distance between 6 boss 6d.First axis distance is less than the second axial distance, and the second axial distance is less than
Three axial distances.Relief hole 9o is located at behind valve body 7 at this time, and holding is communicated with the pressurizing chamber 4d of shell 4.Meanwhile pressurizing chamber
Power brake liquid cavity 9m in 4d and plunger 9 is communicated by recirculation hole 9p with the pressure-releasing chamber 4e of shell 4.Therefore, pressurizing chamber 4d,
Power brake liquid cavity 9m, pressure-releasing chamber 4e are full of the power brake liquid from power brake liquid source, and the pressure phase in these chambers
Deng remaining very low pressure.
The braking operation state of motor vehicle braking system is shown in Figure 11.During vehicle braking, motor vehicle braking system
State shown in the status transition to Figure 11 as shown in Figure 10.
Specifically, when driver will be to vehicle braking, it can brake pedal.The push rod 2 being connected with brake pedal
Pedal brake power is transmitted to plunger 9, so that plunger 9 againsts the reset force of reset spring 12 and moves forward, in Figure 11
Arrow S shown in.Position detecting element 14 detects the changes of magnetic field for the magnet 13 that plunger carries and judges the axial direction of plunger 9
Anterior displacement, thus the braking intention of driver is judged out, and power brake liquid source starts power brake liquid through inlet
4o is supplied into pressurizing chamber 4d, so that the pressure P in pressurizing chamber 4d starts to increase.By means of the pressure P in pressurizing chamber 4d to valve
The pushing forward of body 7 acts on, and the trend that valve body 7 produces forward movement possibly even starts slowly to move forward.Plunger 9 to
(that is, in the case where valve body 7 not yet starts mobile, which is the forward movement of plunger 9 to the preceding distance mobile relative to valve body 7
Distance；And in the case where valve body 7 has begun mobile, which is that the distance that plunger 9 moves forward subtracts valve body 7 forward
Mobile distance) reach first axis apart from when, the front step 9j of plunger 9 touches the rear surface 8b of valve collar 8, and relief hole
9o not yet enters (or not yet completely into) into the sliding through hole 7e of valve body 7, and the front end face 9a of plunger 9 not yet touches column
The boss 6d of seben 6.At this point, plunger 9 starts axially forwardly to compress valve collar 8, while by means of the pressure P in pressurizing chamber 4d to valve
The pushing forward of body 7 acts on, and valve body 7 may be moved forward with the speed lower than plunger 9 (while driving main work through reaction plate 5
Plug 3 moves forward), or it is still not yet practical mobile only with the trend moved forward.When plunger 9 relative to valve body 7 forward
When mobile distance reaches the second axial distance, relief hole 9o is moved fully in the sliding through hole 7e of valve body 7, and therefore and by
Valve body 7 is closed, to be disconnected the connection between pressurizing chamber 4d and power brake liquid cavity 9m and pressure-releasing chamber 4e.Power brake liquid
Source continues through inlet 4o to supply high pressure power brake liquid into pressurizing chamber 4d, so that the pressure P in pressurizing chamber 4d sharply rises
High (becoming considerably higher than the pressure in power brake liquid cavity 9m and pressure-releasing chamber 4e) and push valve body 7 (and through reaction plate 5
Drive main piston 3) it moves forward.At this point, the pressure P in pressurizing chamber 4d act on valve body 7 be exposed to high pressure power brake liquid
Rear portion so that valve body 7 generate forward action in the thrust F1 of the exterior portion of the rear surface 5b of reaction plate 5.Thrust F1
Main piston 3 is transmitted to by reaction plate 5.Since main piston 3 at this time is in initial acceleration phase, thus valve body 7 moves forward
Speed is still below plunger 9.The above-mentioned deboost phase can be referred to as the initial brake stage.
When valve body 7 reaches third axial distance relative to the distance that plunger 9 moves forward, the front end face 9a of plunger 9 is connect
The boss 6d for contacting plunger plate 6, the pedal brake power from plunger 9 act on plunger plate 6, so that the generation of plunger plate 6 is made forward
The thrust F2 of the inboard portion of rear surface 5b for reaction plate 5.Thrust F2 is also transmitted to main piston 3 by reaction plate 5.
In this way, the axially forwardly thrust from reaction plate 5 that main piston 3 is subject to increases to F1+F2 by F1 jump.Braking system is complete at this time
Reach state shown in Figure 11.
Hereafter, plunger 9 is synchronous with valve body 7 moves forward.During this period, main piston 3 under the action of thrust F1 and F2
It is moved forward in the cylinder body of master cylinder 1.Brake fluid in the cylinder body of master cylinder 1 is pressurizeed and is assigned to and makes by main piston 3
The associated each braking of motor-car divides cylinder, to realize the braking of vehicle.Valve body 7, valve collar 8, plunger 9 above structure may insure column
Plug 9 is synchronous with valve body 7 to be moved forward.For example, relief hole 9o can be from valve body when the forward movement speed of valve body 7 is greater than plunger 9
Expose in 7, a part of power brake liquid in pressurizing chamber 4d is caused to leak into power brake liquid cavity 9m through relief hole 9o
In pressure-releasing chamber 4e, so that the pressure P in pressurizing chamber 4d is reduced slightly, so that the speed of valve body 7 is dropped to plunger 9 unanimously.It is logical
Aforesaid way is crossed, realizing, which ensures that plunger 9 is synchronous with valve body 7, moves forward.The above-mentioned deboost phase can be referred to as the effective brake stage
Or the braking intermediate stage.
By the way, by above description as can be seen that plunger plate 6 can also be cancelled in practical application, and by column
The front end face 9a of plug 9 is constructed to be permeable to directly be pushed on the inboard portion of the rear surface 5b of reaction plate 5 forward.In this situation
Under, can the inboard portion of rear surface 5b to reaction plate 5 carry out consolidation process, such as insertion metal sheet etc..
When driver will release braking, can loosen the brake.In this way, plunger 9 can be under the action of reset spring 12
It is mobile in situ rearwardly towards it.At this point, position detecting element 14 detects the changes of magnetic field for the magnet 13 that plunger carries and detects
The displacement axially backward of plunger 9 out, so that the releasing braking intention of driver is judged out, power brake liquid source stops to adding
Chamber 4d is pressed to supply power brake liquid.Further, since plunger 9 moves backward, so that relief hole 9o exposes from valve body 7, cause
Power brake liquid in pressurizing chamber 4d is flowed through relief hole 9o into power brake liquid cavity 9m and pressure-releasing chamber 4e, and through leakage fluid dram
4p discharge, so that the pressure P in pressurizing chamber 4d is drastically reduced, so that the pressure P in pressurizing chamber 4d is reduced to equal to power brake
Pressure in liquid cavity 9m and pressure-releasing chamber 4e.The residual brake hydraulic coupling in 1 downstream of master cylinder forces main piston 3 to move backward to
Initial position shown in FIG. 1.The above-mentioned deboost phase, which can be referred to as, terminates the deboost phase.
One characterization value of brake booster is assist rate, be equal to driver be applied to input power on brake pedal with
Reaction plate 5 is applied to the ratio between the power output on main piston 3.It is appreciated that practical in the axial direction by the rear portion for changing valve body 7
Bear the ratio between cross-sectional area (such as the first shell of column 9f by changing plunger 9 of the area of pressure P and valve body 7 in pressurizing chamber 4d
Cross-sectional area, i.e. the cross-sectional area of the sliding through hole 7e of valve body 7), adjustable assist rate.
In motor vehicle braking system described above, by using the brake booster of offer hydraulic braking power-assisted, so that
When the vehicle is braked, the hydraulic braking power-assisted that the pedal brake power and brake booster that can be applied simultaneously using driver are provided
Vehicle is braked, to alleviate the brake load of driver, enhances vehicle braking effect.The brake boost of the application
Operation of the device independent of engine, but the high pressure power brake liquid for utilizing power brake liquid source to provide provides brake boost.
Therefore, limitation existing for the vacuum brake assistor in traditional technology can be to avoid.Further, since related to booster brake
Hydraulic system be easy by various Hydraulic Elements operation realize power brake liquid supply parameter (such as supply pressure, flow
Amount etc.) control and adjusting, therefore booster brake a variety of different braking functions easy to accomplish of the application.
It may be noted that pedal brake power and hydraulic braking power-assisted are through hydraulic pressure system in the motor vehicle braking system described in front
System is assigned to the wheel for needing to brake.However, according to another feasible applications of the application, pedal brake power and hydraulic braking are helped
Power can also be assigned to the wheel for needing to brake through mechanical system or through mechanical/hydraulic combined system.
It may be noted that being described in the specific embodiment of brake booster in front, many specific structures can be changed
It makes, provides hydraulic braking power-assisted using brake booster as long as can be realized.Therefore, scope of the present application is not limited to
The details of front institute showing and describsion.Without departing from the basic principle of the application, it can be made respectively for these details
Kind modification.
Claims (20)
1. a kind of brake booster in motor vehicle braking system, the motor vehicle braking system include brake pedal, are braked
The pedal brake force transmission element of pedal-driven executes member from the braking that pedal brake force transmission element receives pedal brake power
Part, the brake booster include hydraulic braking power-assisted transmitting element, and being configured on the one hand can be by power brake liquid
Effect to generate brake boost, on the other hand brake boost can be transmitted to the braking executive component；
Wherein, when the vehicle is braked, pedal-driven, the brake booster quilt are braked in response to pedal brake force transmission element
Power brake liquid is supplied, so that power brake liquid is with certain pressure acts on hydraulic braking power-assisted transmitting element and generates hydraulic system
Hydraulic braking power-assisted is transmitted to the braking executive component by dynamic power-assisted, the hydraulic braking power-assisted transmitting element；
Wherein, the pedal brake force transmission element includes the plunger being axially movable, the hydraulic braking power-assisted transmitting element
Including the valve body being axially movable, the plunger and the valve body cooperate, so that in the effective brake stage, the plunger and institute
State the synchronous axial movement of valve body.
2. brake booster as described in claim 1, wherein the pedal brake power and hydraulic braking power-assisted are through public anti-
Functional element is transmitted to braking executive component.
3. brake booster as claimed in claim 2, wherein the pedal brake power is applied to the reaction member
First part, the hydraulic braking power-assisted are applied to the second part of the reaction member.
4. brake booster as claimed in claim 3, wherein the reaction member is reaction plate, the pedal brake
Power is applied to the inboard portion of the reaction plate, and the hydraulic braking power-assisted is applied to the outside portion of the reaction plate
Point.
5. brake booster as described in claim 1 further includes the fortune for detecting the movement of pedal brake force transmission element
Motion detection device, the brake booster judge the braking operation state of vehicle by the testing result of motion detection apparatus, from
And start the supply of power brake liquid in the initial brake stage, and stop the confession of power brake liquid in terminating the deboost phase
It answers.
6. brake booster as claimed in claim 5, wherein the motion detection apparatus includes: to be transmitted by pedal brake power
The signal generating element that element carries, the signal that the signal generating element issues with pedal brake force transmission element movement
And change；With the signal detection component for the signal intensity for detecting the signal generating element.
7. brake booster as claimed in claim 6, wherein the signal generating element is magnet, and the signal issued is
Magnetic field, the signal detection component are detection magnetic field changing magnetic field detecting element.
8. the brake booster as described in any one of claims 1 to 7, wherein
Positional relationship between the plunger and the valve body is arranged so that, in the initial brake stage, the valve body described first
Apply hydraulic braking power-assisted to braking executive component, then the plunger applies pedal brake power to braking executive component.
9. brake booster as claimed in claim 8, wherein relief hole is formed in the plunger, below the relief hole
The mode of stating is arranged: when vehicle starts braking, the plunger is moved relative to the valve body along first axial direction, so that described
Relief hole is closed by the valve body, thus power brake liquid acts on valve body with high pressure；When vehicle terminates braking, the plunger
It is moved relative to the valve body along the second opposite axial direction, so that the relief hole is no longer closed by the valve body and beaten
It opens, thus the power brake hydraulic coupling for acting on valve body is released from.
10. brake booster as claimed in claim 9, wherein the valve body is equipped at it facing to the position of the plunger
Elastic element, the positional relationship between the plunger, the elastic element and the valve body is arranged so that, in initial brake rank
Section, when the plunger relative to the valve body along first axial direction move first axis apart from when, the plunger contact arrives
The elastic element, later, the elastic element are compressed axially by the plunger, when the plunger relative to the valve body along
When one axial direction moves the second axial distance greater than the first axis distance, the relief hole is closed by the valve body
It closes.
11. brake booster as claimed in claim 10, wherein the elastic element is elastic ring piece.
12. brake booster as claimed in claim 9 further includes shell, pressurizing chamber and pressure release are separated out in the shell
Chamber, the valve body are arranged in the pressurizing chamber, and power brake liquid, and the pressurizing chamber and pressure release is supplied in the pressurizing chamber
On-off is realized by the opening and closing of the relief hole between chamber.
13. brake booster as claimed in claim 12 further includes the plunger guide part being fixedly mounted in the shell, use
In the axial movement for guiding the plunger.
14. brake booster as claimed in claim 13, wherein the plunger guide part is also used to the pressurizing chamber and lets out
Chamber is pressed to separate.
15. brake booster as claimed in claim 13, wherein in the corresponding site of the plunger guide part and the plunger
Between be equipped with elastic reset member, for by the plunger towards the Elastic pusher in situ under non-brake state.
16. a kind of motor vehicle braking system, comprising:
Brake pedal；
It is braked the pedal brake force transmission element of pedal-driven；
Brake booster as described in any one of claim 1-15；
Power brake liquid source provides power brake liquid to the brake booster；And
Pedal brake power is received from pedal brake force transmission element and from the hydraulic braking power-assisted transmitting element of brake booster
Receive the braking executive component of hydraulic braking power-assisted.
17. motor vehicle braking system as claimed in claim 16 further includes braking force distribution system, braking executive component is connect
The pedal brake power and hydraulic braking power-assisted received is assigned to brake wheel.
18. motor vehicle braking system as claimed in claim 17, wherein the braking force distribution system is hydraulic distribution system,
Or mechanical distribution system or mechanical/hydraulic combined distribution system.
19. motor vehicle braking system as claimed in claim 17, wherein the braking executive component is hydraulic distribution system or machine
The main piston of tool/Combined hydraulic distribution system master cylinder.
20. motor vehicle braking system as claimed in claim 17, wherein power brake liquid source is the ESP pump of vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410841748.4A CN105799678B (en) | 2014-12-30 | 2014-12-30 | The brake booster and motor vehicle braking system of hydraulic braking power-assisted are provided |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410841748.4A CN105799678B (en) | 2014-12-30 | 2014-12-30 | The brake booster and motor vehicle braking system of hydraulic braking power-assisted are provided |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105799678A CN105799678A (en) | 2016-07-27 |
| CN105799678B true CN105799678B (en) | 2019-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410841748.4A Active CN105799678B (en) | 2014-12-30 | 2014-12-30 | The brake booster and motor vehicle braking system of hydraulic braking power-assisted are provided |
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| Country | Link |
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| CN (1) | CN105799678B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109114065B (en) * | 2018-08-22 | 2020-10-27 | 天津大学 | Sealing device for brake piston of quick press |
| KR102598877B1 (en) | 2019-05-20 | 2023-11-07 | 현대자동차주식회사 | Electric booster having a force feedback control |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1088530A (en) * | 1992-09-30 | 1994-06-29 | 阿利德辛格诺欧洲技术服务有限公司 | The power-assisted braking arrangement that has concealed travel |
| CN102042357A (en) * | 2009-10-22 | 2011-05-04 | 罗伯特博世有限公司 | Brake installation with master cylinder and brake booster but no push rod |
| CN202827552U (en) * | 2012-07-10 | 2013-03-27 | 东风汽车股份有限公司 | Hydraulic booster with brake master cylinder assembly |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009033499A1 (en) * | 2008-07-18 | 2010-01-21 | Continental Teves Ag & Co. Ohg | Brake system for motor vehicles |
| KR101327207B1 (en) * | 2009-11-10 | 2013-11-11 | 주식회사 만도 | Hydraulic Active Booster |
-
2014
- 2014-12-30 CN CN201410841748.4A patent/CN105799678B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1088530A (en) * | 1992-09-30 | 1994-06-29 | 阿利德辛格诺欧洲技术服务有限公司 | The power-assisted braking arrangement that has concealed travel |
| CN102042357A (en) * | 2009-10-22 | 2011-05-04 | 罗伯特博世有限公司 | Brake installation with master cylinder and brake booster but no push rod |
| CN202827552U (en) * | 2012-07-10 | 2013-03-27 | 东风汽车股份有限公司 | Hydraulic booster with brake master cylinder assembly |
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| CN105799678A (en) | 2016-07-27 |
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