CN105799678A - Brake booster for providing hydraulic brake power and vehicle brake system - Google Patents
Brake booster for providing hydraulic brake power and vehicle brake system Download PDFInfo
- Publication number
- CN105799678A CN105799678A CN201410841748.4A CN201410841748A CN105799678A CN 105799678 A CN105799678 A CN 105799678A CN 201410841748 A CN201410841748 A CN 201410841748A CN 105799678 A CN105799678 A CN 105799678A
- Authority
- CN
- China
- Prior art keywords
- brake
- power
- plunger
- valve body
- pedal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention discloses a vehicle brake system and a brake booster thereof, and the brake booster comprises a power brake liquid source and a hydraulic brake power transfer element. When a vehicle conducts brake, to respond to the situation that a pedal braking force transfer element is driven by a brake pedal, power brake liquid is supplied to the brake booster, so that the power brake liquid acts on the hydraulic brake power transfer element with certain pressure to generate hydraulic brake power, and the hydraulic brake power transfer element transfers the hydraulic brake power to a brake execution element.
Description
Technical field
The application relates to a kind of brake booster for vehicle, and it can provide hydraulic braking power-assisted to strengthen braking effect.The application further relates to comprise the motor vehicle braking system of described brake booster.
Background technology
Vehicle generally includes for reducing car speed and/or making vehicle stop the brakes travelling.A lot of vehicles add brake booster in brakes, to strengthen car braking effect.
Modal traditional braking booster is diaphragm type vacuum booster, it is loaded between brake pedal and master cylinder, and including the vacuum chamber separated by diaphragm in the housing and working chamber, vacuum chamber is connected with engine air inlet tube, working chamber, through air cock and atmosphere, is connected by vacuum valve between vacuum chamber and working chamber.In non-brake state, air cock cuts out and vacuum valve is opened, thus vacuum chamber keeps roughly the same with the pressure in working chamber, so that diaphragm keeps substantially static.In on-position, in response to the power that vehicle driver applies on brake pedal, vacuum valve cuts out, and air cock is opened, and air is inhaled into working chamber.Therefore, the pressure in working chamber goes above the pressure in vacuum chamber.Pressure imbalance between vacuum chamber and working chamber causes that diaphragm moves, thus producing the vacuum servo of several times bigger than pedal force on master cylinder.So, master cylinder receives pedal force and vacuum servo simultaneously, therefore can improve the output pressure of master cylinder, thus alleviating pedal force.
It will be seen that traditional vacuum brake assistor utilizes vacuum that engine air inlet tube produces to produce brake boost, therefore, the work of vacuum brake assistor places one's entire reliance upon the operating of electromotor.When engine misses for any reason, vacuum brake assistor will not work.Additionally, the work of electromotor itself also can be caused certain impact by the operation of vacuum brake assistor in turn.
Summary of the invention
The application aims to provide a kind of new-type brake booster, and it does not rely on the operation of electromotor.
For this, an aspect according to the application, provide a kind of brake booster being used in motor vehicle braking system, described motor vehicle braking system includes brake pedal, is braked pedal-actuated pedal brake force transmission element, receives the braking executive component of pedal brake power from pedal brake force transmission element, described brake booster includes hydraulic braking power-assisted transmitting element, it is configured to the effect that can be subject to power brake liquid on the one hand to produce brake boost, on the other hand brake boost can be delivered to described braking executive component；Wherein, when car braking, it is braked pedal-driven in response to pedal brake force transmission element, described brake booster is supplied power brake liquid, making power brake liquid produce hydraulic braking power-assisted so that certain pressure acts on hydraulic braking power-assisted transmitting element, hydraulic braking power-assisted is delivered to described braking executive component by described hydraulic braking power-assisted transmitting element..
According to a kind of embodiments possible, described pedal brake power and hydraulic braking power-assisted are delivered to braking executive component through public reaction member.
According to a kind of embodiments possible, described pedal brake power is applied to the Part I of described reaction member, and described hydraulic braking power-assisted is applied to the Part II of described reaction member.
According to a kind of embodiments possible, described reaction member is reaction plate, and described pedal brake power is applied to the inboard portion of described reaction plate, and described hydraulic braking power-assisted is applied to the Outboard Sections of described reaction plate.
According to a kind of embodiments possible, described brake booster also includes the motion detection apparatus of the motion for detecting pedal brake force transmission element, described brake booster judges the braking operation state of vehicle by the testing result of motion detection apparatus, thus starting the supply of power brake liquid in the initial brake stage, and in terminating the deboost phase, stop the supply of power brake liquid.
According to a kind of embodiments possible, described motion detection apparatus includes: the signal generating element carried by pedal brake force transmission element, and the signal that described signal generating element sends changes along with the motion of pedal brake force transmission element；Signal detection component with the signal intensity detecting described signal generating element.
According to a kind of embodiments possible, described signal generating element is magnet, and its signal sent is magnetic field, and described signal detection component is the field sensing component of detection changes of magnetic field.
According to a kind of embodiments possible, described 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, described plunger coordinates with described valve body, making in the effective brake stage, described plunger and described valve body Tong Bu move axially.
According to a kind of embodiments possible, position relationship between described plunger and described valve body is arranged so that, in the initial brake stage, first described valve body applies hydraulic braking power-assisted to braking executive component, and then described plunger applies pedal brake power to braking executive component.
According to a kind of embodiments possible, described plunger is formed with relief hole, described relief hole is arranged in the following manner: when vehicle starts to brake, described plunger moves along the first axial direction relative to described valve body, described relief hole is closed by described valve body, thus power brake liquid acts on valve body with high pressure；When vehicle terminates to brake, described plunger moves along the second contrary axial direction relative to described valve body so that described relief hole is no longer closed by described valve body and opened, thus the power brake hydraulic coupling acting on valve body is released from.
According to a kind of embodiments possible, described valve body is provided with flexible member at it facing to the position of described plunger, it is preferably elastic ring piece, described plunger, position relationship between described flexible member and described valve body is arranged so that, in the initial brake stage, when described plunger moves the first axial distance relative to described valve body along the first axial direction, described plunger contact is to described flexible member, afterwards, described flexible member is axially compressed by described plunger, when the second axial distance that described plunger moves more than described first axial distance relative to described valve body along the first axial direction, described relief hole is closed by described valve body.
According to a kind of embodiments possible, described brake booster also includes housing, described housing is separated out pressurizing chamber and pressure-releasing chamber, described valve body is arranged in described pressurizing chamber, described pressurizing chamber is supplied power brake liquid, and realizes break-make by the opening and closing of described relief hole between described pressurizing chamber and pressure-releasing chamber.
According to a kind of embodiments possible, described brake booster also includes the plunger guide part being fixedly mounted in described housing, for guiding moving axially of described plunger.
According to a kind of embodiments possible, described plunger guide part is additionally operable to separate described pressurizing chamber and pressure-releasing chamber.
According to a kind of embodiments possible, between described plunger guide part and the corresponding site of described plunger, be provided with elastic reset member, for by described plunger towards the original position Elastic pusher under non-brake state.
According to further aspect of the application, it is provided that a kind of motor vehicle braking system, including: brake pedal；It is braked pedal-actuated pedal brake force transmission element；Previously described brake booster；Power brake liquid source, it provides power brake liquid to described brake booster；And pedal brake power and the braking executive component from the hydraulic braking power-assisted transmitting element reception hydraulic braking power-assisted of brake booster is received from pedal brake force transmission element.
According to a kind of embodiments possible, described motor vehicle braking system also includes braking force distribution system, and its pedal brake power received by braking executive component and hydraulic braking power-assisted are assigned to brake wheel.
According to a kind of embodiments possible, described braking force distribution system is hydraulic distribution system, or mechanical distribution system, or mechanical/hydraulic combined distribution system；Described braking executive component can be the main piston of the master cylinder of hydraulic distribution system or mechanical/hydraulic combined distribution system.
According to a kind of embodiments possible, described power brake liquid source can be the ESP pump of vehicle.
According to the application, utilize hydraulic pressure but not engine air inlet tube vacuum or motor offer brake boost, therefore, the operation of the brake booster of the application does not rely on the operation of electromotor, thus avoiding the limitation that vacuum brake assistor of the prior art exists, the brake boost scheme for motor vehicle braking system provides a kind of useful selection.
Accompanying drawing explanation
Fig. 1 is the sectional view of a part for the motor vehicle braking system of a kind of embodiments possible according to the application；
Fig. 2-9 is the sectional view of some main elements in the brake booster of the motor vehicle braking system of the application；
Figure 10 is the brake booster of the application partial sectional view under non-brake mode of operation；
Figure 11 is the brake booster of the application partial sectional view under braking operation state.
Detailed description of the invention
The embodiments possible of the application is described with reference to the accompanying drawings.
As it is shown in figure 1, a kind of motor vehicle braking system according to the application specifically includes that master cylinder 1, it is supplied brake fluid from unshowned brake fluid reservoir；Push rod 2, it is connected with unshowned brake pedal, and can be braked pedal-driven and transmit the pedal brake power from brake pedal to the main piston 3 of master cylinder 1；Braking point cylinder (not shown), they are connected with master cylinder 1, and are braked the brake fluid of master cylinder 1 supply pressurization when main piston 3 start, in order to corresponding wheel is braked.
The motor vehicle braking system of the application also includes brake booster, and it is disposed axially between brake pedal and master cylinder 1 along what limited by the central axis of master cylinder 1, will the structure of this brake booster be described below.Firstly the need of pointing out, in order to represent the direction of each element, in this application, " afterwards " refers near the direction of push rod 2 or position, " front " refer to deviate from push rod 2, namely near the direction of master cylinder 1 or position.
As it is shown in figure 1, the brake booster of the application specifically includes that housing 4, it is fixed on master cylinder 1 in forward end seal, and the rear portion of main piston 3 is stretched in housing 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, plunger plate 6 and valve body 7 respectively such as, facing to the different piece of reaction plate 5, the inboard portion illustrated and Outboard Sections；The valve collar 8 carried by valve body 7；The plunger 9 being axially movable carried by housing 4, wherein push rod 2 inserts in plunger 9, and can move in plunger 9, for instance by means of the slide block 10 of the front end that support push rod 2；It is fixedly placed on the plunger guide part 11 in housing 4, is used for supporting and guide plunger 9 to move axially in housing 4；Being arranged in the back-moving spring 12 for applying reset force axially backward to plunger 9 in housing 4, it is placed between the corresponding site of plunger guide part 11 and plunger 9 in the example in the figures；It is arranged on the magnet 13 on plunger 9；Position detecting element 14, it determines the axial location of plunger 9 by detecting the changes of magnetic field of magnet 13.
Fig. 2-9 shows the structure of more above-mentioned main elements.It may be noted that what these figure were not necessarily drawn to scale.Referring to Fig. 2-9 and in conjunction with Fig. 1, these elements are described.
As shown in Figure 2, master cylinder 1 have can in its cylinder body main piston 3 in axial sliding, the rear section stretched out towards rear side of this main piston 3 has outer peripheral face 3a and rear end face 3b, and this rear section is formed with Piston bowl 3c, this Piston bowl 3c is limited by diapire 3d and the internal perisporium 3e extended back by diapire 3d, and towards rear open in the rear end face 3b of main piston 3.Internal perisporium 3e is cylinder (such as the face of cylinder, prismatic surface etc.).Main piston 3 constitutes braking executive component.
As it is shown on figure 3, reaction plate 5 has front surface 5a, rear surface 5b and outer peripheral face 5c.Outer peripheral face 5c is consistent with the internal perisporium 3e shape of main piston 3 so that reaction plate 5 can be placed in the Piston bowl 3c of main piston 3, and wherein front surface 5a keeps being adjacent to diapire 3d.Reaction plate 5 preferably by deformable but hardly compressible material make, for instance can by elastomeric material, preferably make with rubber.
As shown in Figure 4, plunger plate 6 has front surface 6a, rear surface 6b, outer peripheral face 6c, boss 6d from rear surface 6c projection backward.Front surface 6a keeps the inboard portion being closely attached on the rear surface 5b of reaction plate 5.Plunger plate 6 is preferably metalwork.
As it is shown in figure 5, valve body 7 is generally cylindrical, there is front surface 7a, rear surface 7b, outer peripheral face 7c.Additionally, form through each other front cavity 7d, slip through hole 7e, rear cavity 7f inside valve body 7 from front to back.The radial dimension of slip through hole 7e is less than front cavity 7d and rear cavity 7f.Valve body 7 is placed in the Piston bowl 3c of main piston 3 in the way of the Outboard Sections of the rear surface 5b of reaction plate 5 by its front surface 7a.Outer peripheral face 7c is consistent with the internal perisporium 3e shape of main piston 3, and is formed with sealing member annular groove 7g along the circumference of outer peripheral face 7c, is used for holding sealing ring 15 (see Fig. 1), will seal between the outer peripheral face 7c and the internal perisporium 3e of main piston 3 of valve body 7.Additionally, the circumference along slip through hole 7e is formed with sealing member annular groove 7h, it is used for holding sealing ring 16 (see Fig. 1).Additionally, be formed with the annular slot 7j towards rear open in the bottom surface 7i of rear cavity 7f, for valve collar 8 is placed in wherein.After being arranged in Piston bowl 3c by reaction plate 5, plunger plate 6, valve body 7 as shown in Figure 1, the rear end face 7b of valve body 7 is not backward beyond the rear end face 3b of main piston 3, it is preferable that relative to rear end face 3b retraction a small distance forward.
As shown in Figure 6, valve collar 8 is the annular element with certain radial thickness and axial width, is made up of the material of elastically deformable, has front surface 8a, rear surface 8b, outer peripheral face 8c and inner peripheral surface 8d.The major part including its front portion of valve collar 8 embeds in the annular slot 7j of valve body 7 as shown in Figure 1, and rear portion is stretched out backward by annular slot 7j, is positioned at rear cavity 7f.
As it is shown in fig. 7, plunger guide part 11 is in generally cylindrical or dish type, there is the inner peripheral surface 11e of guide through hole 11d through before and after front surface 11a, rear surface 11b, outer peripheral face 11c, restriction.Outer peripheral face 11c, inner peripheral surface 11e are circumferentially formed sealing member annular groove 11f, 11g respectively, are used for sealing ring 17,18 (see Fig. 1) is installed.
As shown in Figure 8, housing 4 is generally cylindrical, has front end face 4a, rear end face 4b and outer peripheral face 4c.Inside housing 4, it is formed with pressurizing chamber 4d, pressure-releasing chamber 4e and rear through hole 4f that through each other and radial dimension reduces step by step vertically from front to back, they are limited by front 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, produce the front step 4j towards front side, produce the backward step 4k towards front side between pressure-releasing chamber 4e and rear through hole 4f.Constitute front wall segments 4l between front inner peripheral surface 4g and outer peripheral face 4c, between middle inner peripheral surface 4h and outer peripheral face 4c, constitute mesospore section 4m, between rear inner peripheral surface 4i and outer peripheral face 4c, constitute rear wall section 4n.Additionally, be formed in front wall segments 4l extend to from outer peripheral face 4c before inner peripheral surface 4g, namely lead to the inlet 4o of pressurizing chamber 4d, in mesospore section 4m, be formed with extending to from outer peripheral face 4c inner peripheral surface 4h, namely lead to the leakage fluid dram 4p of pressure-releasing chamber 4e.Additionally, the circumference along rear inner peripheral surface 4i is formed with sealing member annular groove 4q, it is used for holding sealing ring 19 (see Fig. 1).Additionally, be formed with outward extending mounting flange 4r on outer peripheral face 4c, it is preferably placed on rear wall section 4n.
Housing 4 is assembled into master cylinder 1 as shown in Figure 1, the central axis of the two substantially conllinear.Wherein, the front end face 4a of housing 4 is installed on the rear end face of the cylinder body of master cylinder 1 hermetically.It is contained in pressurizing chamber 4d built with the main piston 3 of reaction plate 5, plunger plate 6, valve body 7 and valve collar 8 at its Piston bowl 3c.Plunger guide part 11 is fixedly mounted in pressurizing chamber 4d, is connected to front step 4j with its rear surface 11b.The shape of the outer peripheral face 11c of plunger guide the part 11 and front inner peripheral surface 4g of housing 4 is consistent, and realizes sealing by sealing ring 17 therebetween, and thus, pressurizing chamber 4d is separated by plunger guide part 11 with pressure-releasing chamber 4e.Across a bit of axial distance between the front surface 11a and the rear end face 3b of main piston 3 of plunger guide part 11.The radial dimension of front inner peripheral surface 4g is slightly larger than the outer peripheral face 3a of main piston 3, thus forming annular space 20 (see Fig. 1) between.Inlet 4o is connected to power brake liquid source, for instance ESP (electronics VSC) pump or other hydraulic pump.This annular space 20 enables the power brake liquid getting power brake liquid source to flow into pressurizing chamber 4d from power brake liquid source.
As shown in Figure 9, plunger 9 is in generally cylindrical or bar-shaped, having front end face 9a and start engaging one another extending back and the first cylinder 9b that radial dimension strengthens step by step, the second cylinder 9c, the 3rd cylinder 9d, the 4th cylinder 9e from front end face, these cylinders limit the first shell of column 9f of plunger 9, the second shell of column 9g, the 3rd shell of column 9h and the four shell of column 9i respectively.Intersection between the first cylinder 9b and the second cylinder 9c produces the front step 9j towards front side, intersection between the second cylinder 9c and the three cylinder 9d is formed with the pushing and pressing flange 9k extended radially outwardly, and the intersection between the 3rd cylinder 9d and the four cylinder 9e is formed with the stop lug 9l extended radially outwardly.Magnet 13 is placed on the 3rd shell of column 9h between pushing and pressing flange 9k and stop lug 9l.Additionally, power brake liquid cavity volume 9m is formed in the first shell of column 9f and the second shell of column 9g, namely it is made up of two chamber portion that are axially extending and that communicate with each other in the first shell of column 9f and the second shell of column 9g.The rear portion inner chamber 9n opened towards rear portion is formed in the 4th shell of column 9i.In addition, first shell of column 9f is formed with one or more near front step 9j and extends to the relief hole 9o power brake liquid cavity volume 9m from the first cylinder 9b, the second shell of column 9g is formed one or more and extends to the opening 9p power brake liquid cavity volume 9m from the second cylinder 9c.It may be noted that, although plunger 9 is generally shown as the form of single-piece in the drawings, but in order to process in reality, plunger 9 be formed by two even more part combination of part.Other element is also such.
Plunger 9 is carried by housing 4 as shown in Figure 1.Wherein, the first shell of column 9f inserts in the slip through hole 7e of valve body 7, the guide through hole 11d of the second shell of column 9g traverse plunger guide part 11.Back-moving spring 12 is axially compressed between plunger guide part 11 and pushing and pressing flange 9k around the second shell of column 9g.4th shell of column 9i passes the rear through hole 4f of housing 4 and exposes from rear end face 4b.Sealing ring 19 keeps the sealing between rear wall section 4n and the four shell of column 9i of housing 4.Push rod 2 inserts in the inner chamber 9k of rear portion, and the slide block 10 by means of the front end that support push rod 2 can slide axially in the inner chamber 9k of rear portion.Plunger 9 constitutes pedal brake force transmission element.
Under the reset force effect of back-moving spring 12, plunger 9 is positioned at the position the most rearward shown in Fig. 1, i.e. original position under conventional sense (when motor vehicle braking system is not braked operation), now stop lug 9l pushes against the backward step 4k in housing 4.In this case, relief hole 9o is positioned at the axial rear side of the bottom surface 7i of the rear cavity 7f of valve body 7, keeps communicating with the pressurizing chamber 4d of housing 4.Opening 9p communicates with the pressure-releasing chamber 4e of housing 4 (and actually can also keep when plunger 9 moves forward communicating with pressure-releasing chamber 4e) in this case.
Additionally, position detecting element 14 is arranged on housing 4 in the radial position being generally corresponding to magnet 13, the changes of magnetic field caused in order to detect magnet 13 to move axially.
Referring to Figure 10,11 operations of motor vehicle braking system describing the application.In both of the figures, in order to clear, eliminate some unnecessary elements.
Showing the conventional sense (non-brake mode of operation) of motor vehicle braking system in Figure 10, now the position of each element is identical with shown in Fig. 1 with state.Wherein, brake pedal is not stepped on by driver, it does not have pedal brake power is delivered to plunger 9 through push rod 2, thus plunger 9 locates (position the most rearward) in position under the effect of the reset force of back-moving spring 12.In this state, the first axial distance is separated between the front step 9j and the rear surface 8b of valve collar 8 of plunger 9, separate the second axial distance between the bottom surface 7i of the last side of the relief hole 9o in plunger 9 and the rear cavity 7f of valve body 7, between the front end face 9a and the boss 6d of plunger plate 6 of plunger 9, separate the 3rd axial distance.First axial distance is less than the second axial distance, and the second axial distance is less than the 3rd axial distance.Now relief hole 9o is positioned at after valve body 7, keeps communicating with the pressurizing chamber 4d of housing 4.Meanwhile, the power brake liquid cavity volume 9m in pressurizing chamber 4d and plunger 9 is communicated with the pressure-releasing chamber 4e of housing 4 by opening 9p.Therefore, pressurizing chamber 4d, power brake liquid cavity volume 9m, pressure-releasing chamber 4e are full of the power brake liquid from power brake liquid source, and the pressure in these chambeies is equal, remains very low pressure.
Figure 11 shows the braking operation state of motor vehicle braking system.In car braking process, motor vehicle braking system status transition shown in Figure 10 is to the state shown in Figure 11.
Specifically, when driver will to car braking time, can brake pedal.Pedal brake power is delivered to plunger 9 by the push rod 2 being connected with brake pedal so that plunger 9 againsts the reset force of back-moving spring 12 and moves forward, shown in the arrow S in Figure 11.Position detecting element 14 detects the changes of magnetic field of the magnet 13 that plunger carries and judges the forward axial displacement of plunger 9, thus the braking intention of driver is judged out, power brake liquid source starts to supply power brake liquid in pressurizing chamber 4d through inlet 4o so that the pressure P in pressurizing chamber 4d starts to raise.By means of the pushing effect forward to valve body 7 of the pressure P in pressurizing chamber 4d, valve body 7 creates the trend moved forward possibly even to start slowly to move forward.Distance that plunger 9 moves relative to valve body 7 forward (that is, when not yet starting mobile at valve body 7, the distance that this distance moves forward for plunger 9；And when valve body 7 has begun to mobile, this distance deducts, for the distance that plunger 9 moves forward, the distance that valve body 7 moves forward) when reaching the first axial distance, 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) in the slip through hole 7e of valve body 7, and the front end face 9a of plunger 9 not yet touches the boss 6d of plunger plate 6.Now, plunger 9 starts axially forwardly compression valve collar 8, simultaneously by means of the pushing effect forward to valve body 7 of the pressure P in pressurizing chamber 4d, valve body 7 is likely to move forward (drive main piston 3 to move forward through reaction plate 5) with the speed lower than plunger 9 simultaneously, or still only has the trend moved forward and not yet actual mobile.When plunger 9 reaches the second axial distance relative to the distance that valve body 7 moves forward, relief hole 9o is moved fully in the slip through hole 7e of valve body 7, and therefore and by valve body 7 closing, thus the connection being disconnected between pressurizing chamber 4d and power brake liquid cavity volume 9m and pressure-releasing chamber 4e.High pressure power brake liquid is persistently supplied by power brake liquid source through inlet 4o in pressurizing chamber 4d so that the pressure P in pressurizing chamber 4d sharply raises (becoming considerably higher than the pressure in power brake liquid cavity volume 9m and pressure-releasing chamber 4e) and promotes valve body 7 (and driving main piston 3 through reaction plate 5) to move forward.Now, the pressure P in pressurizing chamber 4d acts on the rear portion being exposed to high pressure power brake liquid of valve body 7 so that valve body 7 produces forward action in the thrust F1 of the Outboard Sections of the rear surface 5b of reaction plate 5.This thrust F1 is delivered to main piston 3 by reaction plate 5.Owing to now main piston 3 is in initial acceleration phase, thus the speed that valve body 7 moves forward is still below plunger 9.The above-mentioned deboost phase can be called the initial brake stage.
When valve body 7 reaches three axial distances relative to the distance that plunger 9 moves forward, the front end face 9a of plunger 9 touches the boss 6d of plunger plate 6, pedal brake power from plunger 9 acts on plunger plate 6, thus plunger plate 6 produces forward action in the thrust F2 of the inboard portion of the rear surface 5b of reaction plate 5.This thrust F2 is also delivered to main piston 3 by reaction plate 5.So, the axially forwardly thrust from reaction plate 5 that main piston 3 is subject to is jumped by F1 and is increased to F1+F2.Now brakes is fully achieved the state shown in Figure 11.
Hereafter, plunger 9 and valve body 7 synchronize to move forward.During this period, main piston 3 moves forward under the effect of thrust F1 and F2 in the cylinder body of master cylinder 1.Brake fluid in the cylinder body of master cylinder 1 is pressurizeed and is assigned to each braking point cylinder associated with abrupt deceleration vehicle by main piston 3, to realize the braking of vehicle.Valve body 7, valve collar 8, plunger 9 said structure may insure that plunger 9 and valve body 7 synchronize to move forward.Such as, when when moving forward speed more than plunger 9 of valve body 7, relief hole 9o can expose from valve body 7, cause that a part of power brake liquid in pressurizing chamber 4d leaks in power brake liquid cavity volume 9m and pressure-releasing chamber 4e through relief hole 9o, thus the pressure P reduced slightly in pressurizing chamber 4d so that the speed of valve body 7 drops to consistent with plunger 9.By the way, it is achieved that guarantee that plunger 9 and valve body 7 synchronize to move forward.The above-mentioned deboost phase can be called effective brake stage or braking interstage.
By the way, by above description it can be seen that practical application can also be cancelled plunger plate 6, and the front end face 9a of plunger 9 is constructed to be permeable to directly be pushed on forward the inboard portion of the rear surface 5b of reaction plate 5.In the case, the inboard portion of the rear surface 5b of reaction plate 5 can be carried out consolidation process, for instance embed metal sheet etc..
When driver to release braking, can loosen the brake.So, plunger 9 can move rearwardly towards its original position under the effect of back-moving spring 12.Now, position detecting element 14 detects that the changes of magnetic field of the magnet 13 that plunger carries detects the displacement axially backward of plunger 9, thus the releasing braking intention of driver is judged out, power brake liquid source stops supplying power brake liquid to pressurizing chamber 4d.In addition, due to being moved rearwards by of plunger 9, relief hole 9o is exposed from valve body 7, cause that the power brake liquid in pressurizing chamber 4d flows in power brake liquid cavity volume 9m and pressure-releasing chamber 4e through relief hole 9o, and discharge through leakage fluid dram 4p, thus the pressure P dramatic drop-off in pressurizing chamber 4d so that the pressure P in pressurizing chamber 4d is reduced to equal to the pressure in power brake liquid cavity volume 9m and pressure-releasing chamber 4e.The residual brake hydraulic coupling in master cylinder 1 downstream forces main piston 3 to move backward to the initial position shown in Fig. 1.The above-mentioned deboost phase can be called the end deboost phase.
One characterization value of brake booster is assist rate, the ratio of the power output that its input power being applied on brake pedal equal to driver is applied on main piston 3 with reaction plate 5.It is appreciated that, rear portion by changing valve body 7 is actual in the axial direction bears the ratio of the area of pressure P and the cross-sectional area of valve body 7 in pressurizing chamber 4d (such as by changing the cross-sectional area of the first shell of column 9f of plunger 9, the i.e. cross-sectional area of the slip through hole 7e of valve body 7), it is possible to regulate assist rate.
In motor vehicle braking system described above, by adopting the brake booster providing hydraulic braking power-assisted, make when car braking, can utilize pedal brake power that driver applies and the hydraulic braking power-assisted that brake booster provides that vehicle is braked simultaneously, thus alleviating the brake load of driver, enhance car braking effect.The brake booster of the application does not rely on the operation of electromotor, but utilizes the high pressure power brake liquid that power brake liquid source provides to provide brake boost.Therefore, the limitation that the vacuum brake assistor in conventional art exists can be avoided.In addition, owing to the hydraulic system relevant to booster brake realizes control and the adjustment of the supply parameter (such as supply pressure, flow etc.) of power brake liquid easily by the operation of various Hydraulic Elements, therefore the booster brake of the application easily realizes various different braking function.
It may be noted that in previously described motor vehicle braking system, pedal brake power and hydraulic braking power-assisted are assigned to the wheel needing braking through hydraulic system.But, the another kind of feasible applications according to the application, pedal brake power and hydraulic braking power-assisted also can through mechanical system or the wheels being assigned to needs braking through mechanical/hydraulic combined system.
It may be noted that in the specific embodiment that disclosed brake booster, many concrete structures can be transformed, as long as being capable of utilizing brake booster to provide hydraulic braking power-assisted.Therefore, scope of the present application be not limited to before institute's details of showing and describing.When not necessarily departing from the ultimate principle of the application, various amendment can be made for these details.
Claims (10)
1. the brake booster being used in motor vehicle braking system, described motor vehicle braking system includes brake pedal, is braked pedal-actuated pedal brake force transmission element, receives the braking executive component of pedal brake power from pedal brake force transmission element, described brake booster includes hydraulic braking power-assisted transmitting element, it is configured to the effect that can be subject to power brake liquid on the one hand to produce brake boost, on the other hand brake boost can be delivered to described braking executive component；
Wherein, when car braking, it is braked pedal-driven in response to pedal brake force transmission element, described brake booster is supplied power brake liquid, making power brake liquid produce hydraulic braking power-assisted so that certain pressure acts on hydraulic braking power-assisted transmitting element, hydraulic braking power-assisted is delivered to described braking executive component by described hydraulic braking power-assisted transmitting element.
2. brake booster as claimed in claim 1, wherein, described pedal brake power and hydraulic braking power-assisted are delivered to braking executive component through public reaction member；
Preferably, described pedal brake power is applied to the Part I of described reaction member, and described hydraulic braking power-assisted is applied to the Part II of described reaction member；
It is further preferred that described reaction member is reaction plate, described pedal brake power is applied to the inboard portion of described reaction plate, and described hydraulic braking power-assisted is applied to the Outboard Sections of described reaction plate.
3. brake booster as claimed in claim 1 or 2, also include the motion detection apparatus of motion for detecting pedal brake force transmission element, described brake booster judges the braking operation state of vehicle by the testing result of motion detection apparatus, thus starting the supply of power brake liquid in the initial brake stage, and in terminating the deboost phase, stop the supply of power brake liquid；
Preferably, described motion detection apparatus includes: the signal generating element carried by pedal brake force transmission element, and the signal that described signal generating element sends changes along with the motion of pedal brake force transmission element；Signal detection component with the signal intensity detecting described signal generating element；
It is further preferred that described signal generating element is magnet, its signal sent is magnetic field, and described signal detection component is the field sensing component of detection changes of magnetic field.
4. brake booster as claimed any one in claims 1 to 3, wherein, described 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, described plunger coordinates with described valve body, making in the effective brake stage, described plunger and described valve body Tong Bu move axially；
Preferably, the position relationship between described plunger and described valve body is arranged so that, in the initial brake stage, first described valve body applies hydraulic braking power-assisted to braking executive component, and then described plunger applies pedal brake power to braking executive component.
5. brake booster as claimed in claim 4, wherein, described plunger is formed with relief hole, described relief hole is arranged in the following manner: when vehicle starts to brake, described plunger moves along the first axial direction relative to described valve body, described relief hole is closed by described valve body, thus power brake liquid acts on valve body with high pressure；When vehicle terminates to brake, described plunger moves along the second contrary axial direction relative to described valve body so that described relief hole is no longer closed by described valve body and opened, thus the power brake hydraulic coupling acting on valve body is released from.
6. brake booster as claimed in claim 5, wherein, described valve body is provided with flexible member at it facing to the position of described plunger, it is preferably elastic ring piece, described plunger, position relationship between described flexible member and described valve body is arranged so that, in the initial brake stage, when described plunger moves the first axial distance relative to described valve body along the first axial direction, described plunger contact is to described flexible member, afterwards, described flexible member is axially compressed by described plunger, when the second axial distance that described plunger moves more than described first axial distance relative to described valve body along the first axial direction, described relief hole is closed by described valve body.
7. the brake booster as described in claim 5 or 6, also include housing, described housing is separated out pressurizing chamber and pressure-releasing chamber, described valve body is arranged in described pressurizing chamber, described pressurizing chamber is supplied power brake liquid, and realizes break-make by the opening and closing of described relief hole between described pressurizing chamber and pressure-releasing chamber.
8. brake booster as claimed in claim 7, wherein, also includes the plunger guide part being fixedly mounted in described housing, for guiding moving axially of described plunger；
Described plunger guide part can be also used for separating described pressurizing chamber and pressure-releasing chamber；
Preferably, between described plunger guide part and the corresponding site of described plunger, be provided with elastic reset member, for by described plunger towards the original position Elastic pusher under non-brake state.
9. a motor vehicle braking system, including:
Brake pedal；
It is braked pedal-actuated pedal brake force transmission element；
Brake booster as according to any one of claim 1-8；
Power brake liquid source, it provides power brake liquid to described brake booster；And
Receive pedal brake power from pedal brake force transmission element and receive the braking executive component of hydraulic braking power-assisted from the hydraulic braking power-assisted transmitting element of brake booster.
10. motor vehicle braking system as claimed in claim 9, also includes braking force distribution system, and its pedal brake power received by braking executive component and hydraulic braking power-assisted are assigned to brake wheel；
Described braking force distribution system can be hydraulic distribution system, or mechanical distribution system, or mechanical/hydraulic combined distribution system；
Described braking executive component can be the main piston of the master cylinder of hydraulic distribution system or mechanical/hydraulic combined distribution system；
Described power brake liquid source can be 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 true CN105799678A (en) | 2016-07-27 |
| CN105799678B CN105799678B (en) | 2019-05-28 |
Family
ID=56981070
Family Applications (1)
| 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 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105799678B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109114065A (en) * | 2018-08-22 | 2019-01-01 | 天津大学 | A kind of sealing device for fast press brake piston |
| US10836369B1 (en) | 2019-05-20 | 2020-11-17 | Hyundai Motor Company | Electric booster having force-feedback-control structure |
Citations (5)
| 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 |
| WO2010007119A2 (en) * | 2008-07-18 | 2010-01-21 | Continental Teves Ag & Co. Ohg | Brake system for motor vehicles |
| 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 |
| US20110108377A1 (en) * | 2009-11-10 | 2011-05-12 | Mando Corporation | Hydraulic active booster |
| 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 |
-
2014
- 2014-12-30 CN CN201410841748.4A patent/CN105799678B/en active Active
Patent Citations (5)
| 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 |
| WO2010007119A2 (en) * | 2008-07-18 | 2010-01-21 | Continental Teves Ag & Co. Ohg | Brake system for motor vehicles |
| 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 |
| US20110108377A1 (en) * | 2009-11-10 | 2011-05-12 | Mando Corporation | Hydraulic active booster |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109114065A (en) * | 2018-08-22 | 2019-01-01 | 天津大学 | A kind of sealing device for fast press brake piston |
| CN109114065B (en) * | 2018-08-22 | 2020-10-27 | 天津大学 | Sealing device for brake piston of quick press |
| US10836369B1 (en) | 2019-05-20 | 2020-11-17 | Hyundai Motor Company | Electric booster having force-feedback-control structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105799678B (en) | 2019-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2957472B1 (en) | Brake device | |
| JP4976280B2 (en) | Method of operating a brake actuation unit of an automobile brake system | |
| JP2007533542A5 (en) | ||
| CN102235450B (en) | Brake actuator unit | |
| JP2009001262A (en) | Master cylinder comprising resupply-promoting seal | |
| EP2749466B1 (en) | Tandem Master cylinder | |
| JP2015143058A (en) | vehicle control device | |
| CN105799678A (en) | Brake booster for providing hydraulic brake power and vehicle brake system | |
| JP5973231B2 (en) | Cylinder device | |
| JPH05193486A (en) | Driving unit for hydraulic brake system | |
| EP2749462B1 (en) | Hydraulic braking system and method of brake boosting in a motor vehicle | |
| JP5716901B2 (en) | Pneumatic booster | |
| JP4458661B2 (en) | Pneumatic booster with control room | |
| JP5780822B2 (en) | Pneumatic booster | |
| US9016806B2 (en) | Brake actuating unit for actuating a motor vehicle braking system of the “brake-by-wire” type, and method for operating a motor vehicle braking system by means of such a brake actuating unit | |
| JP2009143254A (en) | Master cylinder | |
| JP5978504B2 (en) | Brake device for vehicle | |
| JPH11208452A (en) | Pressure generating device | |
| JP2001097207A (en) | Brake system | |
| JP5606862B2 (en) | Brake device for vehicle | |
| JP5528979B2 (en) | Brake device for vehicle | |
| JP5471913B2 (en) | Cylinder device | |
| JP3661259B2 (en) | Booster | |
| KR200240163Y1 (en) | vacuum style hydro servo device | |
| JP3858394B2 (en) | Negative pressure booster |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |