CN203558057U - Pre-brake vacuum booster and belt brake main cylinder assembly thereof - Google Patents
Pre-brake vacuum booster and belt brake main cylinder assembly thereof Download PDFInfo
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- CN203558057U CN203558057U CN201320546002.1U CN201320546002U CN203558057U CN 203558057 U CN203558057 U CN 203558057U CN 201320546002 U CN201320546002 U CN 201320546002U CN 203558057 U CN203558057 U CN 203558057U
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Abstract
The utility model relates to a pre-brake vacuum booster and a belt brake main cylinder assembly thereof. The pre-brake vacuum booster comprises the components of: a housing, a piston housing, a reset device, a template device, a control valve mechanism and a control rod. When the pre-brake vacuum booster frontwards moves through the piston housing relative to the control rod, a second vacuum valve seat of the control valve mechanism displaces relative to the control valve mechanism for realizing elimination or adjustment of an idle stroke, thereby realizing pre-braking. The utility model further relates to the pre-brake vacuum booster belt brake main cylinder assembly.
Description
Technical field
The utility model relates to a kind of automobile brake boosting device, especially relates to the pre-brake type vacuum booster of a kind of automobile with urgent auxiliary brake function; The utility model also relates to a kind of pre-brake type vacuum booster with master cylinder assembly.
Background technology
Pre-brake type vacuum booster is a kind of vacuum servo actuating device, is used in conjunction with the master brake cylinder of automobile.Its principle of work is when trampling brake pedal, promoting joystick moves forward valve bucket, atmospheric valve seat is separated from atmos-valve, allow atmosphere to enter atmosphere chamber from the external world, and piston is because the difference of pressure between vacuum chamber and atmosphere chamber moves forward, promote master cylinder piston, thereby produce delivery pressure in master cylinder, make automobile brake.
For conventional vacuum servo-unit having brake master cylinder assembly, because the idle travel of brake system is long, while making car load braking, brake pedal need to be stepped on very long distance just obvious deceleration.When conventionally stretcher has been stepped on 15～20mm, almost brakeless effect, steps on the poor stop of stretcher while causing car brakeing; Or after stretcher has been crossed 20mm, car load brake system hydraulic pressure, along with input displacement rising is too fast, causes passenger to feel to brake " too quickly ", uncomfortable.
Utility model content
The utility model provides a kind of pre-brake type vacuum booster, idle travel amount can be eliminated or reduce to this pre-brake type vacuum booster, when thereby the pre-brake type vacuum booster of this brake type and master brake cylinder are used in conjunction with, can realize pre-braking, reduce the difficulty of speed of a motor vehicle control.The concrete technical scheme that the utility model adopts is:
A kind of pre-brake type vacuum booster, comprising:
Housing;
The piston shell that is positioned at housing and can moves vertically relative to housing;
Act on the returning device of piston shell front end, housing simultaneously;
Be positioned at the plate device of housing, plate device and piston shell go out vacuum chamber and atmosphere chamber by enclosure interior spatial separation;
Be positioned at the control cock mechanism of piston shell, control cock mechanism is used for controlling gas and enters vacuum chamber and atmosphere chamber, and controls gas and discharge from atmosphere chamber;
The joystick that control cock mechanism is manipulated;
Wherein, control cock mechanism comprises: the stop base that joins with joystick and can move vertically relative to housing, and the rear end of stop base is atmospheric valve seat; The first vacuum bed of piston shell; The valve circle assembly that can be resisted against atmospheric valve seat and the first vacuum bed, atmospheric valve seat and valve circle are always shaped as atmos-valve mouth, and the first vacuum bed and valve circle are always shaped as the first vacuum valve port; And the sliding bush apparatus that can move vertically relative to piston shell, the rear end of sliding bush apparatus is the second vacuum valve seat, the second vacuum valve seat and valve circle are always shaped as the second vacuum valve port; When the first vacuum valve port or the second vacuum valve port are closed, vacuum chamber and atmosphere chamber are isolated; When the first vacuum valve port and the second vacuum valve port are opened simultaneously, vacuum chamber communicates with atmosphere chamber; When atmosphere valve port is opened, atmosphere chamber communicates with the external world;
Pre-brake type vacuum booster is when without vacuum state, and atmosphere valve port, the second vacuum valve port are opened, and the first vacuum valve port is closed, and atmosphere chamber is communicated with atmosphere; When vacuum chamber vacuumizes, the servo force being produced by pressure reduction between vacuum chamber and atmosphere chamber promotes piston shell and moves forward, now stop base keeps transfixion, atmosphere valve port is closed subsequently, the first vacuum valve port and the second vacuum valve port are opened, the gas of atmosphere chamber enters vacuum chamber, until the first vacuum valve port and atmosphere valve port are closed simultaneously; After this, when joystick is promoted by external force, it is static that sliding bush apparatus keeps, atmosphere valve port is opened, and piston shell, stop base and valve circle assembly are pushed ahead, along with the increase of the displacement of piston shell, stop base and valve circle assembly, the second vacuum valve seat withstands valve circle assembly, the first vacuum valve seat separates with valve circle assembly, and in the rise after this moving forward at the relative joystick of piston shell, relative the first vacuum valve seat of the second vacuum valve seat is subjected to displacement.
In the rise moving forward at the relative joystick of piston shell, the size of relative the first vacuum valve seat amount of being subjected to displacement of the second vacuum valve seat is eliminated exactly or to adjust idle travel amount how many, the displacement that namely piston shell moves forward with respect to joystick, the mode moving forward with respect to joystick by piston shell realizes pre-braking.
As preferably, this pre-brake type vacuum booster also comprises hydraulic feedback device, and hydraulic feedback device comprises:
Driving device, be positioned at housing and can move vertically, this driving device can act on stop base front end, when this pre-brake type vacuum booster and master brake cylinder are used in conjunction with, the hydraulic action of the hydraulic cavities of the first piston assembly of master brake cylinder is in driving device, to driving device, provides an application force backward;
Drag devices, provides application force forward to driving device.
After the pre-brake type vacuum booster that hydraulic feedback device is set coordinates with master brake cylinder, when joystick is subject to advancing, sliding bush apparatus keeps transfixion, at this moment piston shell, stop base and valve circle assembly are along with after atmosphere valve port is opened, back cavity enter air and form before, back cavity pressure reduction is pushed ahead, simultaneously first piston is subject to the effect of piston shell also to follow piston shell to push ahead, until first piston idle travel disappears, the hydraulic cavities of first piston assembly is built pressure immediately, when the hydraulic pressure of the hydraulic cavities of first piston assembly the application force of driving device is greater than drag devices to the application force of driving device after, driving device is toward moving with joystick opposite sense, thereafter driving device acts on stop base front end, certain feedback force (being the application force of driving device to stop base) is fed back to stop base front end, stop stop base to be pushed ahead, force atmosphere valve port opening to reduce, thereby realize hydraulic feedback effect, only have joystick to continue to increase thrust, just can make atmosphere valve port opening increase.
As preferably, described driving device is drive link, and described drag devices comprises and the relatively-stationary mount pad of piston enclosure location, acts on the elastic component of mount pad, drive link simultaneously.
The utility model also provides a kind of pre-brake type vacuum booster with master cylinder assembly, and this pre-brake type vacuum booster with master cylinder assembly comprises above-mentioned pre-brake type vacuum booster, and master brake cylinder; Master brake cylinder comprises first piston assembly, the second piston assembly; First piston assembly comprises first piston, and this first piston rear end acts on piston shell front end.
As preferably, this pre-brake type vacuum booster also comprises hydraulic feedback device, and hydraulic feedback device comprises being positioned at least partly to be installed the driving device of through hole and be installed on the drag devices that through hole is installed; This driving device can move and act on stop base front end vertically, and the part that is positioned at driving device front end in installation through hole communicates with the hydraulic cavities of first piston assembly; This drag devices provides application force forward to driving device.
As preferably, above-mentioned driving device comprises plunger, and the rear end of plunger can act on stop base front end.
Compared with prior art, the beneficial effect that the pre-brake type vacuum booster of the utility model has is:
Even if 1 load is the brake system of car load, the idle travel of car load brake system also can be eliminated or reconcile to this pre-brake type vacuum booster completely, also can realize pre-braking;
2,, when this pre-brake type vacuum booster and master brake cylinder mating reaction, pre-brake type vacuum booster can promptly be built pressure, sets up brake system pressure higher, and can regulate and control under identical input displacement condition;
3, this pre-brake type vacuum booster arranges after hydraulic feedback device, can regulate and control car load brake system oil pressure, so have incomparable preceence in the test of adjusting car load brake pedal feel, what make trampling brake pedal feels comfortable;
4, this pre-brake type vacuum booster arranges after hydraulic feedback device, can improve servo-unit power-assisted efficiency, improves delivery pressure.
Accompanying drawing explanation
Fig. 1 is the cutaway view of pre-brake type vacuum booster embodiment mono-.
Fig. 2 is the cutaway view of sliding bush apparatus pre-brake type vacuum booster when work initial condition of pre-brake type vacuum booster embodiment mono-.
Fig. 3 is the cutaway view of pre-brake type vacuum booster embodiment mono-in quick dislocation state of kinematic motion.
Fig. 4 is the assembly drowing of sliding sleeve and key in Fig. 1.
Fig. 5 is the cutaway view of pre-brake type vacuum booster with master cylinder assembly embodiment bis-.
Fig. 6 is the cutaway view of sliding bush apparatus pre-brake type vacuum booster when work initial condition of pre-brake type vacuum booster with master cylinder assembly embodiment bis-.
Fig. 7 is the cutaway view of pre-brake type vacuum booster with master cylinder assembly embodiment bis-in quick dislocation state of kinematic motion.
Fig. 8 is the characteristic curve schematic diagram of pre-brake type vacuum booster with master cylinder assembly Input Forces and delivery pressure.
Fig. 9 is master brake cylinder delivery pressure and brake pedal displacement characteristic curve comparison figure.
Figure 10 is that Input Forces and delivery pressure characteristic curve show view.
Figure 11 is delivery pressure and brake pedal displacement curve schematic diagram.
In figure: 1-joystick, 2-piston shell, 3-valve bowl, 4-valve coil spring, 5-sliding sleeve spring, 6-back cover seal ring, 7-sliding sleeve, 8-back cover, 9-template, 10-mount pad, 11-the first spring, 12-drive link, 13-fore shell, 14-diaphragm, 15-vacuum check valve, 16-pull back spring, 17-presses dish, 18-lining, 19-key, 20-boss, 21-assembles key hole, 22-stop base inside flange face, 23-stop base, 24-valve circle, 25-atmosphere chamber, 26-vacuum chamber, 27-spacing hole, 28-back-up ring, 29-plunger, 30-steel ball, 31-the first spring assembly, 32-the second spring assembly, 33-the second piston, 34-hydraulic cavities, 35-primary cup, 36-secontary cup, 37-first piston, 38-installs through hole, 39, the little leather cup of 42-, 40-O RunddichtringO, 41-positive stop lug boss, S1-atmospheric valve seat, S2-the first vacuum valve seat, S3-the second vacuum valve seat, K1-atmosphere valve port, K2-the first vacuum valve port, K3-the second vacuum valve port.
The specific embodiment
For the ease of it will be appreciated by those skilled in the art that below in conjunction with accompanying drawing and embodiment, the utility model is described further.
Fig. 1 is to Figure 3 shows that the pre-brake type vacuum booster of the utility model embodiment mono-.
This pre-brake type vacuum booster, comprises that housing, piston shell 2, returning device, template 9 are installed, vacuum check valve 15, control cock mechanism and joystick 1.
Wherein, housing comprises back cover 8 and fore shell 13, and piston shell 2 is slidably mounted in back cover 8, and can move vertically.Returning device is the pull back spring 16 that two ends act on respectively piston shell 2 front ends, fore shell 13.Template 9 devices comprise that outer rim is tightly encapsulated in the diaphragm 14 of housing and the lamina membranacea with piston shell 2 interference fit, lamina membranacea inner edge and piston shell 2 are fixedly linked, between lamina membranacea and piston shell 2, be provided with seal ring, between piston shell 2 and fore shell 13, be provided with back cover seal ring 6, piston shell 2, back cover 8, back cover seal ring 6, template 9 devices surround atmosphere chamber 25, and lamina membranacea device and fore shell 13, piston shell 2 surround vacuum chamber 26.Vacuum check valve 15 is installed on fore shell 13, from vacuum check valve 15, can introduce negative pressure.Control cock mechanism is positioned at piston shell 2, this control cock mechanism is used for controlling gas and enters vacuum chamber 26 and atmosphere chamber 25, and control gas and discharge from atmosphere chamber 25, the pressure reduction between atmosphere chamber 25 and vacuum chamber 26 is changed under unbalance and balance two states.
This control cock mechanism comprises: with the stop base 23 that joystick 1 docking is connected and can moves vertically relative to housing, the rear end of stop base 23 is atmospheric valve seat S1; The first vacuum bed of piston shell 2; Can be resisted against valve circle 24 assemblies of atmospheric valve seat S1 and the first vacuum bed.Atmospheric valve seat S1 and valve circle 24 are always shaped as atmos-valve mouth K1, and the switch control gas of atmosphere valve port K1 enters atmosphere chamber 25.The first vacuum bed and valve circle 24 are always shaped as the first vacuum valve port K2.This control cock mechanism also comprises the sliding bush apparatus that can move vertically relative to piston shell 2, and the rear end of sliding bush apparatus is the second vacuum valve seat S3, and the second vacuum valve seat S3 and valve circle 24 are always shaped as the second vacuum valve port K3.When the first vacuum valve port K2 or the second vacuum valve port K3 close, vacuum chamber 26 is isolated with atmosphere chamber 25; When the first vacuum valve port K2 and the second vacuum valve port K3 open simultaneously, vacuum chamber 26 communicates with atmosphere chamber 25; When atmosphere valve port K1 opens, atmosphere chamber 25 communicates with the external world.
Valve circle 24 assemblies comprise valve circle 24 and valve coil spring 4.Valve coil spring 4 two ends act on respectively valve circle 24, valve bowl 3, to valve circle 24, provide application force forward, make valve circle 24 assemblies can be resisted against atmospheric valve seat S1, the first vacuum bed, the second vacuum bed.
Sliding bush apparatus comprises cylindric sliding sleeve 7, U-shaped key 19 and sliding sleeve spring 5.Sliding sleeve 7 is installed in the annular groove of piston shell 2 rear ends, and the second vacuum valve seat S3 is between the first vacuum valve seat S2 and atmospheric valve seat S1.Key 19 is through the spacing hole 27 of sliding sleeve 7, and as Fig. 4, and end face can be resisted against the boss 20 of back cover 8 thereafter, and certainly, piston shell 2 is established the assembling key hole 21 that allows key 19 pass.This key 19 limits the displacement size of sliding sleeve 7 relative piston shells 2.Sliding sleeve spring 5 two ends act on respectively sliding sleeve 7, piston shell 2, to sliding sleeve 7, provide an application force backward.Between the second vacuum valve seat S3 and the first vacuum valve seat S2, be also provided with seal ring.
This pre-brake type vacuum booster also comprises hydraulic feedback device, and hydraulic feedback device comprises the driving device, the drag devices that are positioned at fore shell 13.This driving device is axially displaceable drive link 12, these drive link 12 rear ends can act on stop base 23 front ends, when this pre-brake type vacuum booster and master brake cylinder are used in conjunction with, the hydraulic action of the hydraulic cavities 34 of first piston 37 assemblies of master brake cylinder is in drive link 12 front ends, to drive link 12, provides an application force backward.This drag devices comprises and the piston shell 2 relatively-stationary mount pads 10 in position, and the first spring 11, the first springs 11 that simultaneously act on mount pad 10, drive link 12 can provide an application force forward to drive link 12.The application force of the hydraulic pressure of the hydraulic cavities 34 of first piston 37 assemblies that the application force that this hydraulic feedback device feeds back to joystick 1 is master brake cylinder to drive link 12 front ends and the first spring 11 are made a concerted effort to drive link 12 application forces.
This pre-brake type vacuum booster also comprises the lining 18 that is installed on piston shell 2 front ends, and this lining 18 is provided with the through hole that allows stop base 23 front ends pass; When this pre-brake type vacuum booster coordinates with master brake cylinder, the first piston 37 of master brake cylinder presses on lining 18.This pre-brake type vacuum booster also comprises the pressure dish 17 being installed between piston shell 2 and pull back spring 16, and lining 18 is pressed dish 17 to press in piston shell 2 front ends, thus the position of fixed hub 18.This pre-brake type vacuum booster also comprises the cuticle bowl 42 of the first installation through hole that is installed on piston shell 2, and stop base 23 front end polished rod portions are pressed in these cuticle bowl 42 inner sides, prevent that atmosphere chamber 25 from communicating by the first installation through hole with vacuum chamber 26.
Fig. 5 is to Figure 7 shows that the pre-brake type vacuum booster with master cylinder of the utility model assembly embodiment bis-.
This pre-brake type vacuum booster with master cylinder assembly comprises pre-brake type vacuum booster and master brake cylinder, and this pre-brake type vacuum booster comprises that housing, piston shell 2, returning device, template 9 are installed, vacuum check valve 15, control cock mechanism, joystick 1, hydraulic feedback device, lining 18 and press dish 17.Its middle shell, piston shell 2, returning device, template 9 are installed, vacuum check valve 15, control cock mechanism, joystick 1, lining 18 and press the assemblies such as dish 17 identical with assembly corresponding in the pre-brake type vacuum booster of the utility model embodiment mono-, at this, are just not described in detail.
Described brake master cylinder assembly comprises first piston 37 assemblies, the second piston 33 assemblies, primary cup 35, secontary cup 36 and steel ball 30.First piston 37 assemblies comprise that first piston 37 and the first spring assembly 31, the second piston 33 assemblies comprise the second piston 33 and the second spring assembly 32.The drag of the second spring assembly 32 makes first piston 37 have predetermincd tension to lining 18.
Described hydraulic feedback device is installed in the installation through hole 38 of first piston 37, and this installation through hole 38 is coaxial with first piston 37, and the front end of through hole 38 and the hydraulic cavities 34 of first piston 37 are installed communicate.Hydraulic feedback device comprises driving device and drag devices, wherein driving device is plunger 29, the front portion of plunger 29 is provided with annular groove, can prevent in the hydraulic cavities 34 of first piston 37 that leak of liquid is to the installation through hole 38 that is positioned at cuticle bowl 39 rear sides by being located at the cuticle bowl 39 of annular groove.Drag devices comprises back-up ring 28, mount pad 10 and the first spring 11; Back-up ring 28 is fixed on the tail end that through hole 38 is installed, and for limiting the mount pad 10 that is positioned at its front side, mount pad 10 and the position of first piston 37 is immobilized; The middle part of this plunger 29 is provided with positive stop lug boss 41, the first spring 11 two ends and acts on respectively mount pad 10 and positive stop lug boss 41, to plunger 29, provides application force forward.The leading portion diameter of this installation through hole 38 is less than section diameter thereafter, the interior formation one ladder platform of through hole 38 is installed in order, positive stop lug boss 41 front portions are provided with mounting groove, in this mounting groove, be arranged with O RunddichtringO 40, hydraulic feedback device is not when being subject to the application force of external force, the predetermincd tension of the first spring 11 makes positive stop lug boss 41 be resisted against ladder platform, and now O RunddichtringO 40 can reduce the impact of 26 li of vacuum of vacuum chamber on cuticle bowl 39 leak tightnesss.The hydraulic action that is subject to the hydraulic cavities 34 of first piston 37 assemblies when plunger 29 front ends overcomes after the predetermincd tension of the first spring 11, and plunger 29 just can move backward, by force feedback to stop base 23.
Now the working process of the pre-brake type vacuum booster with master cylinder of the utility model assembly is described in detail.
(1) pre-brake type vacuum booster is without vacuum state
When brake type vacuum booster is without vacuum state in advance, the predetermincd tension of pull back spring 16 drags and master cylinder forms to back pressure piston shell 2 jointly, and assembling key hole 21 front end faces of piston shell 2 are close to the leading flank of key 19, by key 19 to pusher until top to the boss 20 of back cover 8.Now air valve port is in opening, and the first vacuum valve port K2 is in closed condition; Atmosphere chamber 25 is communicated with atmosphere, and vacuum chamber 26 is full of atmosphere, and the pressure of vacuum chamber 26 and atmosphere equates, without servo force.
(2) pre-brake type vacuum booster initial condition
Pre-brake type vacuum booster just vacuumizes, and while being initial condition, vacuum chamber 26 and atmosphere chamber 25 pressure are unequal, and two chamber pressure reduction produce forward thrust.Forward thrust makes piston shell 2 and pushes ahead slightly with the rigidly connected assembly of piston shell 2 (this assembly comprise valve bowl 3, template 9 are installed, lining 18), and now stop base 23 keeps motionless.Under valve coil spring 4 effect of elastic resistance, valve circle 24 is close to the first vacuum valve seat S2 and is moved forward, atmosphere valve port K1 closes gradually simultaneously, and the atmospheric valve seat S1 that is stopped base 23 when valve circle 24 is when withstand, atmosphere valve port K1 closes, subsequently because piston shell 2 continues to push ahead, make the first vacuum valve seat S2 separation with valve circle 24, the first vacuum valve port K2 opens, and now gas enters vacuum chamber 26 from atmosphere chamber 25, as shown in lead-in wire XX.When the servo force of the pressure reduction generation between two chambeies can be offset pull back spring 16 and master cylinder predetermincd tension just, as shown in Figure 5, the first vacuum valve port K2, atmosphere valve port K1 are simultaneously in closed condition, the leading flank of key 19 and assembling key hole 21 front end faces of piston shell 2 depart from simultaneously, but the aft end face of key 19 still withstands the boss 20 of back cover 8, in this process, piston shell 2, valve bowl 3 and valve circle 24 all move forward, and stop base 23 and sliding sleeve 7 remain motionless.
(3) sliding bush apparatus work initial condition
While providing an enough propelling thrust to joystick 1, this propelling thrust will overcome the drag of valve coil spring 4, making joystick 1 head on stop base 23 moves forward, the first vacuum valve port K2 is opened, and now the first vacuum valve port K2 still in closed condition, air enters rapidly atmosphere chamber 25, as shown in lead-in wire ZZ.Atmosphere chamber 25 increases with the pressure reduction of vacuum chamber 26, producing larger servo force is pushing away piston shell 2 and is moving forward to overcome pull back spring 16 drags, now the distance of assembling key hole 21 front end faces of piston shell 2 and the leading flank of key 19 increases, because stop base 23 also moves forward, stop base inside flange face 22 departs from the leading flank of key 19 simultaneously.When piston shell 2 moves forward, key 19 keeps static with sliding sleeve 7, so the second vacuum valve seat S3 moves backward relative to piston shell 2, the first vacuum valve seat S2 and the second vacuum valve port K3 press on valve circle 24 simultaneously subsequently, as shown in Figure 6, at this moment the second vacuum valve seat S3 is just preparing to substitute the first vacuum valve port K2 and plays dislocation motion and eliminate or adjust idle travel effect, and this state is defined as sliding bush apparatus work initial condition.
(4) sliding bush apparatus work final state
When sliding bush apparatus is when working initial condition, to joystick 1, continue to provide propelling thrust forward, atmosphere valve port K1 continues in opening, and the servo piston shell 2 of trying hard to recommend that atmosphere constantly enters atmosphere chamber 25, two chamber pressure reduction continues to move forward.Due to the effect of sliding sleeve spring 5 drags, sliding sleeve 7 still keeps quiescence with key 19, now key 19 is still resisted against on the boss 20 of back cover 8, and the drag of sliding sleeve spring 5 is much larger than the drag of valve coil spring 4, so the second vacuum valve seat S3 backs down valve circle 24, make the first vacuum valve seat S2 depart from valve circle 24, the first vacuum valve port K2 opens, the second vacuum valve port K3 closes, that is to say in the rise in remaining stage, the second vacuum valve port K3 replaces the first vacuum valve port K2 and controls vacuum chamber 26 and atmosphere chamber 25(or atmosphere) whether be communicated with.In rise after the second vacuum valve port K3 replaces the first vacuum valve port K2, joystick 1 advances with certain speed V, piston shell 2 is also to push ahead with identical speed V with respect to joystick 1, piston shell 2 is pushing away first piston 37 and is moving forward fast with 2V speed so, and this rapid movement are defined as quick dislocation campaign.Between the second vacuum valve port K3 between quick dislocation moving period and the first vacuum valve port K2, distance is exactly that the displacement X that misplaces occurs, displacement X number be exactly that to eliminate or adjust idle travel amount how many, the utility model is exactly to realize pre-brake type with the displacement X of this quick dislocation.When quick dislocation moves to certain distance, assembling key hole 21 aft end faces of the firm abuts against plunger shell 2 of the trailing flank of key 19, and the boss 20 that does not also have enough time to depart from back cover 8 of key 19, this state is defined as sliding bush apparatus work final state, as shown in Figure 7.
At sliding bush apparatus work initial condition in sliding bush apparatus work final state process, the fltting speed of joystick 1 is constant, be not subject to the impact of dislocation motion fast, dislocation motion only makes piston shell 2 joystick 1 relative to master cylinder piston move forward displacement X fast, so this servo-unit also can not affect the sensation of brake activation pedal.Rise after sliding bush apparatus work final state, the assembly that the piston shell 2 of servo-unit, returning device, template 9 are installed, the work of vacuum check valve 15, control cock mechanism, joystick 1 etc. is corresponding with common servo-unit is the same, at this, is just not described in detail.
(5) hydraulic feedback device feedback
First piston 37 is subject to servo force and pushes ahead, when idle travel disappears, the hydraulic cavities 34 of the hydraulic cavities 34 of first piston 37 assemblies and the second piston 33 assemblies is built pressure at once, because the front end that through hole 38 is installed communicates with the hydraulic cavities 34 of first piston 37 assemblies, the hydraulic pressure of the hydraulic cavities 34 of first piston 37 assemblies will feed back to plunger 29 front ends so.When the hydraulic cavities 34 of first piston 37 assemblies, build and press the feedback force that produces while being not enough to overcome the predetermincd tension of the first spring 11, first piston 37 is just subject to the servo vacuum power that piston shell 2 produces and pushes ahead, and plunger 29 cannot be to stop base 23, joystick 1 retroactive effect power, in this stage " Input Forces and delivery pressure characteristic curve ", by initiating power initial point, starting straight line rises, can regard assist rate infinity as, as shown in JP section in Fig. 8.When the hydraulic cavities 34 of first piston 37 assemblies, build and press the feedback force that produces while enough overcoming the predetermincd tension of the first spring 11, plunger 29 moves backward, plunger 29 feeds back to joystick 1 by application force by stop base 23 after pressing on stop base 23, this application force is application force to plunger 29 front ends of the hydraulic pressure of hydraulic cavities 34 of first piston 37 assemblies of master brake cylinder and the first spring 11 to the making a concerted effort of drive link 12 application forces, in this stage " Input Forces and delivery pressure characteristic curve " as shown in SR in Fig. 8.
Plunger 29 with certain proportion by force feedback to stop base 23, joystick 1, this ratio is exactly the assist rate of servo-unit, the size of assist rate is relevant to plunger 29 cross-sectional area ratios with first piston 37, sectional area ratio is larger, assist rate is also larger, and the application force that feeds back to joystick 1 is just less, vice versa.Therefore can adjust with first piston 37 cross-sectional areas and plunger 29 cross-sectional area ratios the assist rate size of servo-unit.
Because the working process of pre-brake type vacuum booster in the working process of pre-brake type vacuum booster in the utility model embodiment mono-and embodiment bis-is basic identical, thus no longer in embodiment mono-in advance the working process of brake type vacuum booster be described in detail.
This pre-brake type vacuum booster is as adopted Rubber Parts feedback, utilize dislocation motion fast to eliminate or reduce idle travel and will cause new problem, servo-unit jump value is very large, approaches even very much or is equal to flex point value, makes the controlled linearity of servo-unit very poor or almost do not have; Causing above-mentioned factor is because Rubber Parts deflection is very little, when dislocation moving displacement amount is greater than Rubber Parts deflection, when reaching maximum deformation quantity, Rubber Parts feedback force can not be passed to stop base, joystick until on brake pedal, cause the assist rate infinity of servo-unit without feedback force.And hydraulic feedback device of the present utility model is passed to stop base, joystick by drive link or the plunger of rigidity by feedback force, thereby solving to utilize dislocation fast to move and eliminate or reduce idle travel causes servo-unit jump value very large, approach even very much or be equal to flex point value, making the problem that the controlled linearity of servo-unit is very poor or almost do not have.
And traditional type servo-unit is owing to adopting Rubber Parts feedback, Rubber Parts poor fluidity, is subject to the environmental concernss such as temperature humidity large, and after particularly passing through durability test cycle, Rubber Parts can produce serious permanent deformation, and jump value and assist rate are changed very greatly.And the first initial tension of spring of the hydraulic feedback device of above-mentioned prefabricated vacuum booster and plunger or drive link cross-sectional area are can Yin Wendu etc. larger variation not to occur after environment and durability test cycle, thereby jump value and assist rate change less, the stable performance of hydraulic feedback device; And the jump value of servo-unit and assist rate can regulate.
Hydraulic feedback device, except the advantage of above-mentioned stability, also possesses the advantage of high-effect conversion.When the front/back cavity pressure reduction generation servo force of tradition servo-unit passes to master brake cylinder, that the servo force just servo-unit being produced after Rubber Parts compressive deformation passes to master cylinder piston, Rubber Parts can change into servo-unit portion of energy the potential energy of rubber compressive deformation in compressive deformation and flow process, makes servo-unit degradation of energy.And hydraulic feedback device is, by hard parts, the servo force of servo-unit is passed to master cylinder piston, in transmittance process, almost there is no degradation of energy.Thereby hydraulic feedback device can pass to brake master cylinder assembly by the energy efficient rate of pre-brake type vacuum booster.
The master brake cylinder delivery pressure of the pre-brake type vacuum booster with master cylinder of a certain specification assembly to the utility model enforcement two is analyzed with brake pedal (brake pedal is connected with joystick 1) displacement, its characteristic curve is as shown in curve 9-2 in Fig. 9, and curve 9-1 is the master brake cylinder delivery pressure of servo-unit having brake master cylinder assembly and the characteristic curve of brake pedal displacement of traditional same specification size.
Master brake cylinder delivery pressure and brake pedal displacement curve 9-2 to pre-brake type vacuum booster with master cylinder assembly analyzes now.The process that the origin of coordinates of curve 9-2 is ordered to DS is exactly that " pre-brake type vacuum booster initial condition " arrives " sliding bush apparatus work initial condition ", and DS is the initial point that dislocation is moved fast; The process that the DS of curve 9-2 is ordered to DB is exactly that " sliding bush apparatus work initial condition " arrives " sliding bush apparatus work final state ", this process is exactly under the effect of sliding bush apparatus, to make piston shell 2 promote first piston 37 process that dislocation is moved occurs, there is rapidly dislocation motion in first piston 37 in this process, master brake cylinder chamber pressure is gone up rapidly, the jump of being ordered to DB by DS point, DB point is the terminating point that dislocation is moved fast.
Dotted portion in Fig. 9 is that curve 9-2 is from DS point extendible portion forward, known by new curve and curve 9-1 contrast that in dotted portion and curve 9-2, DS point latter half forms, the dislocation campaign of in fact pre-brake type vacuum booster is just equivalent to the master brake cylinder delivery pressure of the servo-unit having brake master cylinder assembly of traditional same specification size and brake pedal displacement curve to refer to brake pedal ratio to left i × X mm(i, X is dislocation moving displacement amount), make pre-brake type vacuum booster can eliminate or regulate the idle travel of master cylinder assembly.
The true value of this pre-brake type vacuum booster is not only to regulate the idle travel of car load brake system, and can make the servo-unit of low specification replace the servo-unit of high standard size to use, thereby has reduced on manufacturing cost.Now with 10 cun of vacuum booster band 23.81 cylinder diameter brake master cylinder assemblys of tradition and 9 cun of pre-brake type vacuum booster band 22.22 cylinder diameter brake master cylinder assemblys, compare, wherein, both parameters are: initiating power is 60N, and assist rate is 8, jump value is 1.0MPa, identical load.
The effective servo vacuum power that calculates 9 cun of pre-brake type vacuum boosters according to above-mentioned parameter is at 2300N, and effective servo vacuum power of 10 cun of vacuum boosters of tradition is at 2800N; Master brake cylinder transforms by 95% efficiency, obtain Input Forces and the delivery pressure characteristic curve of above-mentioned two servo-unit having brake master cylinder assembly, see Figure 10, wherein curve 10-1 is Input Forces and the delivery pressure characteristic curve of 10 cun of vacuum booster band 23.81 cylinder diameter brake master cylinder assemblys of tradition, curve 10-2 is Input Forces and the delivery pressure characteristic curve of 9 cun of pre-brake type vacuum booster band 22.22 cylinder diameter brake master cylinder assemblys, as can be seen from Figure 10, the flex point value of two servo-unit is 7.3MPa.
Delivery pressure and brake pedal displacement curve to above-mentioned two kinds of servo-unit having brake master cylinder assemblies are analyzed, see Figure 11, wherein curve 11-1 is delivery pressure and the brake pedal displacement curve of 10 cun of vacuum booster band 23.81 cylinder diameter brake master cylinder assemblys of tradition, and curve 11-2 is delivery pressure and the brake pedal displacement curve of 9 cun of pre-brake type vacuum booster band 22.22 cylinder diameter brake master cylinder assemblys.As can be seen from Figure 11,9 cun of pre-brake type vacuum booster band 22.22 cylinder diameter brake master cylinder assemblys voltage built-up rate in brake system is very fast, but along with stroke increases, the pressure that 10 cun of vacuum booster band 23.81 cylinder diameter brake master cylinder assemblys of tradition are built pressure is slowly caught up with the pressure that even exceedes 9 cun of pre-brake type vacuum booster band 22.22 cylinder diameter brake master cylinder assemblys, and two curves finally intersect and overlap at power-assisted flex point A place.From delivery pressure and displacement curve, can find out, not only curve linear is better for 9 cun of pre-brake type vacuum booster band 22.22 cylinder diameter brake master cylinder assemblys, and 9 cun of pre-brake type vacuum booster band 22.22 cylinder diameter brake master cylinder assemblys can reach the flex point value of 10 cun of vacuum booster band 23.81 cylinder diameter brake master cylinder assemblys of tradition, namely 9 cun of pre-brake type vacuum booster band 22.22 cylinder diameter brake master cylinder assemblys can replace 10 cun of vacuum booster band 23.81 cylinder diameter brake master cylinder assemblys of tradition to use.Above-mentioned 9 cun of pre-brake type vacuum booster band 22.22 cylinder diameter brake master cylinder assembly voltage built-up rates are more slow as can be seen from Figure 11, and that 10 cun of vacuum booster band 23.81 cylinder diameter brake master cylinder assemblys of tradition are built pressure ratio is very fast, and curve is steeper.Therefore traditional type servo-unit drag comparison " suddenly ", car load during braking " is nodded " clearly, relatively under pre-brake type vacuum booster with master cylinder assembly braking to build pressure ratio more slow, softer during braking, controllability is good.
The above embodiment has only expressed part embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (10)
1. a pre-brake type vacuum booster, comprising:
Housing;
The piston shell that is positioned at housing and can moves vertically relative to housing;
Act on the returning device of piston shell front end, housing simultaneously;
Be positioned at the plate device of housing, plate device and piston shell go out vacuum chamber and atmosphere chamber by enclosure interior spatial separation;
Be positioned at the control cock mechanism of piston shell, control cock mechanism is used for controlling gas and enters vacuum chamber and atmosphere chamber, and controls gas and discharge from atmosphere chamber;
The joystick that control cock mechanism is manipulated;
It is characterized in that, control cock mechanism comprises: the stop base that joins with joystick and can move vertically relative to housing, and the rear end of stop base is atmospheric valve seat; The first vacuum bed of piston shell; The valve circle assembly that can be resisted against atmospheric valve seat and the first vacuum bed, atmospheric valve seat and valve circle are always shaped as atmos-valve mouth, and the first vacuum bed and valve circle are always shaped as the first vacuum valve port; And the sliding bush apparatus that can move vertically relative to piston shell, the rear end of sliding bush apparatus is the second vacuum valve seat, the second vacuum valve seat and valve circle are always shaped as the second vacuum valve port; When the first vacuum valve port or the second vacuum valve port are closed, vacuum chamber and atmosphere chamber are isolated; When the first vacuum valve port and the second vacuum valve port are opened simultaneously, vacuum chamber communicates with atmosphere chamber; When atmosphere valve port is opened, atmosphere chamber communicates with the external world;
Pre-brake type vacuum booster is when without vacuum state, and atmosphere valve port, the second vacuum valve port are opened, and the first vacuum valve port is closed, and atmosphere chamber is communicated with atmosphere; When vacuum chamber vacuumizes, the servo force being produced by pressure reduction between vacuum chamber and atmosphere chamber promotes piston shell and moves forward, now stop base keeps transfixion, atmosphere valve port is closed subsequently, the first vacuum valve port and the second vacuum valve port are opened, the gas of atmosphere chamber enters vacuum chamber, until the first vacuum valve port and atmosphere valve port are closed simultaneously; After this, when joystick is promoted by external force, it is static that sliding bush apparatus keeps, atmosphere valve port is opened, and piston shell, stop base and valve circle assembly are pushed ahead, along with the increase of the displacement of piston shell, stop base and valve circle assembly, the second vacuum valve seat withstands valve circle assembly, the first vacuum valve seat separates with valve circle assembly, and in the rise after this moving forward at the relative joystick of piston shell, relative the first vacuum valve seat of the second vacuum valve seat is subjected to displacement.
2. pre-brake type vacuum booster according to claim 1, is characterized in that: also comprise hydraulic feedback device, hydraulic feedback device comprises:
Driving device, be positioned at housing and can move vertically, this driving device can act on stop base front end, when this pre-brake type vacuum booster and master brake cylinder are used in conjunction with, the hydraulic action of the hydraulic cavities of the first piston assembly of master brake cylinder is in driving device, to driving device, provides an application force backward;
Drag devices, provides application force forward to driving device.
3. pre-brake type vacuum booster according to claim 2, is characterized in that: described driving device is drive link, and described drag devices comprises and the relatively-stationary mount pad of piston enclosure location, acts on the elastic component of mount pad, drive link simultaneously.
4. pre-brake type vacuum booster according to claim 1, is characterized in that: described sliding bush apparatus comprises cylindric sliding sleeve, U-shaped key and sliding sleeve spring; Sliding sleeve is installed in the annular groove of piston outer casing back, and the second vacuum valve seat is between the first vacuum valve seat and atmospheric valve seat; Key is through the spacing hole of sliding sleeve and the assembling key hole of piston shell, and the aft end face of key can be resisted against the boss of back cover; Sliding sleeve both ends of the spring acts on respectively sliding sleeve, piston shell, to sliding sleeve, provides an application force backward; Described pre-brake type vacuum booster also comprises the lining that is installed on piston shell front end, is installed on the pressure dish between piston shell and returning device; This lining is provided with the through hole that allows stop base front end pass; And pressed dish to press in piston shell front end; When this pre-brake type vacuum booster coordinates with master brake cylinder, the first piston of master brake cylinder presses on lining.
5. a pre-brake type vacuum booster with master cylinder assembly, comprises master brake cylinder; Wherein master brake cylinder comprises first piston assembly, the second piston assembly; First piston assembly comprises first piston, it is characterized in that: also comprise pre-brake type vacuum booster described in claim 1, first piston rear end acts on piston shell front end.
6. pre-brake type vacuum booster with master cylinder assembly according to claim 5, it is characterized in that: described pre-brake type vacuum booster also comprises hydraulic feedback device, hydraulic feedback device comprises being positioned at least partly to be installed the driving device of through hole and is installed on the drag devices that through hole is installed; This driving device can move and act on stop base front end vertically, and the part that is positioned at driving device front end in installation through hole communicates with the hydraulic cavities of first piston assembly; This drag devices provides application force forward to driving device.
7. pre-brake type vacuum booster with master cylinder assembly according to claim 6, is characterized in that: described driving device comprises plunger, and the rear end of plunger can act on stop base front end; Described drag devices comprises the mount pad being fixed in installation through hole, and acts on the elastic component of mount pad, plunger simultaneously.
8. pre-brake type vacuum booster with master cylinder assembly according to claim 7, is characterized in that: described plunger middle part is provided with positive stop lug boss, and elastic component two ends act on respectively mount pad and positive stop lug boss; The leading portion diameter of this installation through hole is less than section diameter thereafter, and order is installed in through hole and formed a ladder platform, and hydraulic feedback device is not when being subject to the application force of external force, and the predetermincd tension of the first spring makes positive stop lug boss be resisted against ladder platform.
9. pre-brake type vacuum booster with master cylinder assembly according to claim 5, is characterized in that: described sliding bush apparatus comprises cylindric sliding sleeve, U-shaped key and sliding sleeve spring; Sliding sleeve is installed in the annular groove of piston outer casing back, and the second vacuum valve seat is between the first vacuum valve seat and atmospheric valve seat; Key is through the spacing hole of sliding sleeve and the assembling key hole of piston shell, and the aft end face of key can be resisted against the boss of back cover; Sliding sleeve both ends of the spring acts on respectively sliding sleeve, piston shell, to sliding sleeve, provides an application force backward.
10. pre-brake type vacuum booster with master cylinder assembly according to claim 5, it is characterized in that: described pre-brake type vacuum booster also comprises the lining being installed between piston shell and first piston, is installed on the pressure dish between piston shell and returning device; This lining is provided with the through hole that allows stop base front end pass, and is pressed dish to press in piston shell front end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320546002.1U CN203558057U (en) | 2013-09-03 | 2013-09-03 | Pre-brake vacuum booster and belt brake main cylinder assembly thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320546002.1U CN203558057U (en) | 2013-09-03 | 2013-09-03 | Pre-brake vacuum booster and belt brake main cylinder assembly thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203558057U true CN203558057U (en) | 2014-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320546002.1U Expired - Fee Related CN203558057U (en) | 2013-09-03 | 2013-09-03 | Pre-brake vacuum booster and belt brake main cylinder assembly thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203558057U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103496364A (en) * | 2013-09-03 | 2014-01-08 | 广东中博汽车零部件有限公司 | Pre-brake type vacuum booster and belt brake master cylinder assembly thereof |
| CN112874496A (en) * | 2021-02-26 | 2021-06-01 | 高小明 | Vacuum booster for automobile braking |
-
2013
- 2013-09-03 CN CN201320546002.1U patent/CN203558057U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103496364A (en) * | 2013-09-03 | 2014-01-08 | 广东中博汽车零部件有限公司 | Pre-brake type vacuum booster and belt brake master cylinder assembly thereof |
| CN103496364B (en) * | 2013-09-03 | 2016-03-30 | 广东中博汽车零部件有限公司 | Pre-brake type vacuum booster and having brake master cylinder assembly thereof |
| CN112874496A (en) * | 2021-02-26 | 2021-06-01 | 高小明 | Vacuum booster for automobile braking |
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