CN203005406U - Booster and brake system - Google Patents
Booster and brake system Download PDFInfo
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- CN203005406U CN203005406U CN 201220592461 CN201220592461U CN203005406U CN 203005406 U CN203005406 U CN 203005406U CN 201220592461 CN201220592461 CN 201220592461 CN 201220592461 U CN201220592461 U CN 201220592461U CN 203005406 U CN203005406 U CN 203005406U
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- elastomeric element
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Abstract
The utility model discloses a booster (100) and a brake system. The booster comprises a valve body (2) and a boosting component, wherein the boosting component comprises a ball screw which comprises a screw (40), a nut (41) and a plurality of balls matched between the screw (40) and the nut (41), the nut (41) is in linkage with the valve body (2), the nut (41) moves on the matched screw (40) along a straight line, and therefore the valve body (2) is driven to move along a straight line. The brake system comprises the booster (100) and a hydraulic system which comprises a brake main cylinder (11) provided with a piston (12), and the valve body (2) is connected to the piston (12). The booster can provide high transmission efficiency.
Description
Technical field
The utility model relates to the device that power-assisted is provided, and relates in particular to servo-unit and brake system.
Background technology
Limited because of people's strength, the operation of vehicle often needs work-saving device, and for example, vehicle uses light purpose by the relevant apparatus of pressurized air, high pressure wet goods servo-unit operating and controlling vehicle to reach.The development of modern automobile drg originates from original machinery controls, the most original braking is controlled just, and one group of simple mechanical device of pilot control applies application force to drg, vehicle weight at that time is smaller, velocity ratio is lower, mechanical braking can satisfy the needs of automobile brake, but along with the increase of automobile own wt, it is important that work-saving device more and more seems concerning drg.
the Chinese invention patent application of announcing on October 5th, 2011 discloses No. CN102205838A and discloses a kind of electric booster brake device for vehicle, it comprises pedal, the Input Forces push rod that is connected with pedal, the servo-unit that is connected with the Input Forces push rod, the output force pushing bar that is connected with servo-unit, the master cylinder that is connected with output force pushing bar, described servo-unit comprises the tooth bar that is connected between Input Forces push rod and output force pushing bar, with the tooth bar gears in mesh, the DC motor band speed reducer assembly that is connected with gear by transmission shaft, electronic control unit ECU and be connected in speed sensor on the Input Forces push rod, described speed sensor is connected with electronic control unit ECU, described electronic control unit ECU is connected with DC motor band speed reducer assembly.
The Chinese invention patent application of announcing on December 6th, 2006 discloses No. CN1872599A and discloses a kind of force aid system for braking, it comprises pedal push rod, rubber reaction plate, master cylinder push rod, brake pedal and housing, and this system also comprises motor, worm screw and worm gearing, and the rotary driving force of motor is transformed into linear drives power by described worm screw and worm gearing.
Yet no matter be that Chinese invention patent application discloses disclosed electric booster brake device for vehicle No. CN102205838A, or Chinese invention patent application discloses disclosed force aid system for braking No. CN1872599A, and also there is the problem that driving efficiency is poor, rotational noise is high, cost is high or volume is compact not in it.
Therefore, be necessary to provide improvement to overcome the technical matters that exists in prior art.
Summary of the invention
The main technical problems to be solved in the utility model is to improve the driving efficiency of servo-unit.
For solving the problems of the technologies described above, the utility model provides a kind of servo-unit, and it comprises:
Valve body;
The power-assisted assembly, it comprises ball screw, and described ball screw comprises screw rod, nut and is matched with some balls between described screw rod and nut, nut and valve body interlock, described nut moves along a straight line on the described screw rod of its cooperation, moves along a straight line thereby drive described valve body.
In aforesaid servo-unit, alternatively, described power-assisted assembly comprises at least two secondary ball screw and drivings device, and described driving device comprises the input rotating shaft, described input rotating shaft and the interlock of described screw rod, and the rotary power of described input rotating shaft is delivered to every described screw rod.
In aforesaid servo-unit, alternatively, described power-assisted assembly also comprises boosting disk, and described nut can not be installed on described boosting disk with the relative rotation, and described power-assisted assembly drives described valve body by described boosting disk.
In aforesaid servo-unit, alternatively, described servo-unit also comprises housing, and described valve body can longitudinally move between primary importance and the second place point-blank with respect to described housing; When described input rotating shaft is rotated in the forward, thereby described nut moves to described primary importance point-blank along the described valve body of the described power-assisted Component driver of forward stroke straight-line motion on the described screw rod of its cooperation, when described input rotating shaft contrarotation, thereby described nut moves to the described second place point-blank along the described valve body of the described power-assisted Component driver of backward travel straight-line motion on the described screw rod of its cooperation.
In aforesaid servo-unit, alternatively, described servo-unit also comprises input block, actuator, ECU (Electrical Control Unit) and stroke sensor, described input block can be in the situation that do not have the described valve body of power-assisted assembly power-assisted driving to move point-blank to described primary importance, actuator can arrive described input rotating shaft by outputting rotary power, the work of described actuator is controlled in the displacement of the described input block that the displacement of the described input block of described stroke sensor detecting, described ECU (Electrical Control Unit) detect according to described stroke sensor.
In aforesaid servo-unit, alternatively, described boosting disk arranges centre hole, and described valve body passes described centre hole, and described valve body arranges the boosting platform, and described nut drives described valve body by described boosting disk against described boosting platform.
In aforesaid servo-unit, alternatively, described servo-unit also comprises the first elastomeric element, when described valve body moves to described primary importance, described the first elastomeric element elastic deformation and storage of potential energy, when described the first elastomeric element discharged potential energy, described the first elastomeric element drove described valve body and moves to the described second place.
in aforesaid servo-unit, alternatively, described input block can be with respect to described valve body crank motion between resting guard and activation point, between described input block and described valve body, the second elastomeric element is set, in the situation that do not have the described input block of External Force Acting to be remained on described resting guard by the elastic force of the second elastomeric element, drive described input block in described activation point motion process in external force, described the second elastomeric element elastic deformation and storage of potential energy, when arriving described activation point, described input block drives described valve body motion under the further effect of described input block in external force, when described the second elastomeric element discharges potential energy, described the second elastomeric element drives described input block and moves to described resting guard.
In aforesaid servo-unit, alternatively, described servo-unit also comprises the actuator that connects described input rotating shaft, and described actuator is for exporting the motor of forward and contrarotation power, and the screw rod of described at least two secondary ball screws is arranged axisymmetrically with respect to described valve body.
In aforesaid servo-unit, alternatively, described driving device is gear system, and described gear system has the plastic gear that is installed to the steel axle.
In aforesaid servo-unit, alternatively, described stroke sensor is the magnet medium sensor.
In aforesaid servo-unit, alternatively, be provided with bindiny mechanism between valve body and nut, a described bindiny mechanism part is fixed in described nut, and another part is connected with valve body.
For solving the problems of the technologies described above, the utility model also provides a kind of brake system, and it comprises aforesaid servo-unit and hydraulic efficiency pressure system, and described hydraulic efficiency pressure system comprises the master brake cylinder with piston, and described valve body is connected to described piston.
In aforesaid brake system, alternatively, the reaction plate that elastomeric material is made is installed between described valve body and described piston.
Compared to existing work-saving device, servo-unit of the present utility model has higher driving efficiency, and, reasonable in design, small volume, with low cost.
By the detailed description below with reference to accompanying drawing, other aspects of the present utility model and feature become obvious.But should be known in the only purpose design for explaining of this accompanying drawing, rather than as the restriction of scope of the present utility model, this is because it should be with reference to additional claim.Should also be appreciated that, accompanying drawing only is intended to illustrate conceptually structure described herein and flow process, unless otherwise noted, and the unnecessary accompanying drawing of drawing to scale.
Description of drawings
Consult by reference to the accompanying drawings the detailed description of the following specific embodiment, will understand more fully the utility model, reference numbers same in accompanying drawing refers to element same in view all the time.Wherein:
Fig. 1 shows according to the schematic diagram of the servo-unit of a kind of specific embodiment of the utility model, wherein shows for convenience the structure of servo-unit inside, and do not show the housing of servo-unit;
Fig. 2 shows the structural representation of the servo-unit of analysing and observe along A-A line shown in Figure 1, and wherein servo-unit is in resting state;
Fig. 3 shows the structural representation of the servo-unit of analysing and observe along B-B line shown in Figure 1, and wherein servo-unit is in resting state;
Fig. 4 is the local structure for amplifying schematic diagram according to the valve body of a kind of specific embodiment of the utility model that shows from similar visual angle shown in Figure 3;
Fig. 5 shows that servo-unit shown in Figure 2 is applying treadle effort and servo-unit and start the structural representation of the state of assist function;
Fig. 6 shows that servo-unit shown in Figure 2 is applying that treadle effort and servo-unit start assist function and reaching the structural representation of maximum brake boost state; And
Fig. 7 shows servo-unit shown in Figure 2 in the situation that assist function lost efficacy, the structural representation when applying treadle effort and braking.
The specific embodiment
For helping those skilled in the art can understand definitely the claimed theme of the utility model, describe the specific embodiment of the present utility model in detail below in conjunction with accompanying drawing.
The utility model provides a kind of brake system, and this brake system comprises servo-unit 100 and the hydraulic efficiency pressure system shown in Fig. 1 to 7, and hydraulic efficiency pressure system comprises the master brake cylinder 11 with piston 12.Below will describe the specific embodiment of servo-unit 100 provided by the utility model in detail.
See also shown in Fig. 1 to 7, fixing by bolt of rear end plate 9 according to the servo-unit 100 of a kind of specific embodiment of the utility model.Servo-unit 100 comprises valve body 2 and power-assisted assembly, valve body 2 is connected on the piston 12 of master brake cylinder 11, this power-assisted assembly comprises ball screw and input rotating shaft 60, ball screw comprise screw rod 40, nut 41 and be matched with screw rod 40 and nut 41 between some balls (not shown), thereby screw rod 40 links when input rotating shaft 60 is rotated with input rotating shaft 60, screw rod 40 is moved along a straight line at the screw rod 40 of its cooperation by the power driven rotation and the nut 41 that pass over from input rotating shaft 60, thereby power-assisted Component driver valve body 2 moves along a straight line.Servo-unit 100 of the present utility model has higher driving efficiency.
Servo-unit 100 also comprises housing 1, and valve body 2 can longitudinally move between primary importance and the second place point-blank with respect to housing 1; When input rotating shaft 60 is rotated in the forward, thereby nut 41 moves to primary importance point-blank along forward stroke straight-line motion power-assisted Component driver valve body 2 on the screw rod 40 of its cooperation, when input rotating shaft 60 contrarotation, thereby nut 41 moves to the second place point-blank along backward travel straight-line motion power-assisted Component driver valve body 2 on the screw rod 40 of its cooperation.Housing 1 arranges receiving space 10, and valve body 2 comprises first end 21 and second end 22 relative with first end 21, and first end 21 is housed in receiving space 10, and the second end 22 is given prominence to outside receiving space 10.Alternatively, valve body guidance 19 is installed on housing 1, valve body 2 is arranged in valve body guidance 19, thereby valve body 2 can longitudinally motion under the guiding of valve body guidance 19.Housing 1 also is equipped with guard shield 13, guard shield 13 roughly flare and have can dilatation ripple struction, large mouthful of guard shield 13 with housing 1 combination.The second end 22 of giving prominence to the valve body 2 outside receiving space 10 extends in guard shield 13 from the bottom of guard shield 13.
Please in conjunction with consulting in detail Fig. 3 and shown in Figure 4, the end of the first end 21 of valve body 2 arranges the first counterbore 23, the first counterbore 23 bottom center arrange the diameter of the second counterbore 24, the second counterbores 24 less than the diameter of the first counterbore 23, thereby form step between the first counterbore 23 and the second counterbore 24.The end of the second end 22 of valve body 2 arranges input counterbore 25.The middle part of valve body 2 arranges jogger hole 27, and jogger hole 27 is communicated with the second counterbore 24 and input counterbore 25.
In this specific embodiment, to comprise that two secondary ball screws describe as example take the power-assisted assembly, two screw rods 40 of two secondary ball screws are installed on receiving space 10 inside of housing 1 abreast, when every screw rod 4 is rotated in the forward, along the forward stroke straight-line motion, power-assisted Component driver valve body 2 moves to primary importance nut 41 point-blank in the forward stroke of nut 41 on the screw rod 4 of its cooperation; When every screw rod 4 contrarotation, nut 41 on the screw rod 4 of its cooperation along the backward travel straight-line motion.Alternatively, the power-assisted assembly comprises driving device 6, and driving device 6 comprises input rotating shaft 60, and the rotary power that will input rotating shaft 60 is delivered to every screw rod 40.Particularly, driving device 6 also comprises at least two output wheels 61,62, and can comprise some intermediate gears (not label) according to the needs of transmission, driving device 6 will be inputted the rotary power of rotating shaft 60 through speed change, be converted to two output wheels 61,62 rotary power, each output wheel 61,62 can not connect a screw rod 40 with the relative rotation, thereby the rotary power that will input rotating shaft 60 is delivered to every screw rod 40.In a kind of optional specific embodiment, driving device 6 is gear system, and gear system has the plastic gear that is installed to the steel axle.Although according to a kind of concrete embodiment of the present utility model, driving device 6 is described to the gear drive form, but those skilled in the art should know, the utility model is not limited to this form, for example, can also be the combination of chain sprocket drive, belt pulley transmission or multiple type of belt drive.To describe in detail as the back, nut 41 does not rotate and the screw rod 40 that is rotated promotes, and nut 41 is delivered to power-assisted on valve body 2 by boosting disk 42.When treadle effort disappears, due to the motion of plunger 32, the motor reversal that stroke sensor 81 will notify ECU (Electrical Control Unit) 8 to control as actuator 7, simultaneously as below describing in detail, the first elastomeric element 51 will instead push away valve body 2 rollbacks.Although the servo-unit 100 of this specific embodiment comprises two secondary ball screws; but those skilled in the art should know; servo-unit 100 of the present utility model is not limited to two secondary ball screws; it also can comprise three secondary ball screws; the perhaps ball screw of more pairs, these are all within protection domain of the present utility model.Every secondary ball screw include screw rod 40, nut 41 and be matched with screw rod 40 and nut 41 between some balls.And alternatively, the screw rod 40 of at least two secondary ball screws is arranged axisymmetrically with respect to valve body 2.Thereby realize that the power-assisted assembly is evenly to valve body 2 application of forces.
The power-assisted assembly also comprises boosting disk 42, and boosting disk 42 can longitudinal movement with respect to valve body 2 but can not relatively be rotated, and two nuts 41 all can not be installed on boosting disk 42 with the relative rotation, and the power-assisted assembly drives valve bodies 2 by boosting disk 42.Boosting disk 42 arranges centre hole, and valve body 2 passes centre hole, and valve body 2 arranges boosting platform 20, and boosting platform 20 arranges near the first end 21 of valve body 2.Boosting disk 42 drives valve body 2 against boosting platform 20 in the forward stroke of nut 41.
Servo-unit 100 also comprises the first elastomeric element 51.In a kind of specific embodiment, the first elastomeric element 51 is coil spring, and the first elastomeric element 51 is arranged on housing 1 and is fixed between the push rod retainer 15 of valve body 2, and the first elastomeric element 51 is by precompressed compression.Certainly, those skilled in the art will appreciate that the first elastomeric element 51 can also adopt other materials to make, and also can adopt other mode that the first elastomeric element 51 is installed.For example, the first elastomeric element 51 can be laminated spring; The mounting means of the first elastomeric element 51 can be changed into and be directly installed between the master brake cylinder 11 and valve body 2 of fixing with respect to housing 1.With respect to front a kind of mounting means, this mounting means only needs housing 1 allow out position (the position perforate that for example the first elastomeric element 51 occupies on housing 1), and the first elastomeric element 51 can touch master brake cylinder 11; Only need push rod retainer 15 allow out position (for example, dwindling push rod retainer 15), the first elastomeric element 51 can touch valve body 2.Again for example, the mounting means of front is all the precompressed compression distortion, those skilled in the art will appreciate that the first elastomeric element 51 can also adopt the mode of tensile deformation.The various variations of the first elastomeric element 51 or remodeling all belong to scope of the present utility model, and the elastic force of needs the first elastomeric element 51 can be applied to directly or indirectly valve body 2 and get final product.Therefore, when valve body 2 moves to primary importance, the first elastomeric element 51 elastic deformations and storage of potential energy, when the first elastomeric element 51 discharged potential energy, the first elastomeric element 51 drove valve bodies 2 and moves to the second place.
Servo-unit 100 also comprises input block 3, actuator 7, ECU (Electrical Control Unit) 8 and stroke sensor 81, input block 3 can be in the situation that do not have power-assisted assembly power-assisted driving valve body 2 to move point-blank to primary importance, thereby connecting input rotating shaft 60, actuator 7 can arrive input rotating shaft 60 by outputting rotary power, the work of actuator 7 is controlled in the displacement of the input block 3 that the displacement of stroke sensor 81 detecting input blocks 3, ECU (Electrical Control Unit) 8 detect according to stroke sensor 81.
In a kind of specific embodiment, actuator 7 is rotated in the forward and the motor of contrarotation power for exporting.It will be apparent to those skilled in that, thereby come the rotation direction output of switch motor to be rotated in the forward and contrarotation power by circuit, usually more easily realize than mechanical commutation.And because mechanical commutation device usually requires to occupy certain volume, therefore, actuator 7 adopts to export and is rotated in the forward and the motor of contrarotation power also can help to dwindle the overall volume of servo-unit 100.
In a kind of specific embodiment, stroke sensor 81 is the magnet medium sensor.Radially connect valve body 2 guide groove 28 is set, guide groove 28 is the long trough of longitudinal extension, and the key 814 that is fixed in plunger 32 extends radially out from the both sides of plunger 32, and the key 814 of stretching can back and forth vertically move along guide groove 28 in the guide groove 28 of both sides relatively.The outside magnet retainer 812 of installing of valve body 2 is installed magnet 810 in magnet retainer 812.In the specific embodiment as shown in Figure 3, two magnets 810 are installed in magnet retainer 812.Magnet retainer 812 is arranged in the groove (not label) of valve body 2 outsides actively, and can be under the guiding of groove vertical crank motion.The guide groove 28 that one end of key 814 passes a side is fixed to magnet retainer 812, and therefore, magnet retainer 812 can move along with the motion of plunger 32.Stroke sensor 81 is arranged on the outside of magnet 810, and when two magnets 810 of magnet retainer 812 and wherein installation move along with plunger 32, stroke sensor 81 will be sensed the variation in magnetic field, thereby detect stroke.Need to prove, in the specific embodiment shown in Figure 3, magnet retainer 812 and two magnets 810 wherein installing are positioned at housing 1 inside, also say, two magnets 810 of magnet retainer 812 and wherein installation are between housing 1 and valve body 2, and stroke sensor 81 is arranged on the outside of housing 1.
In brake system of the present utility model, master brake cylinder 11 has the piston 12 of the push rod 14 that connects servo-unit 100, by push rod retainer 15, push rod 14 is fixed to the first end 21 of valve body 2.Please the emphasis combination consult shown in Fig. 2 to 4, alternatively, the reaction plate 16 of being made by elastomeric material is installed between valve body 2 and piston 12, particularly, the first counterbore 23 bottoms installation reaction plates 16 at valve body 2, and push rod 14 ends have increase section, and this increase section is arranged on reaction plate 16 outsides of installing in the first counterbore 23.Push rod retainer 15 middle parts arrange through hole, and push rod 14 passes the through hole at push rod retainer 15 middle parts and is connected to piston 12, but the increase section of push rod 14 ends is fixed in the first counterbore 23 by push rod retainer 15.Plunger disc 17 is installed in the second counterbore 24 of valve body 2, be communicated with jogger hole 27 due to the second counterbore 24 and middle part, the bottom by the first counterbore 23 is communicated with the first counterbore 23, therefore in jogger hole 27, movable push rod 18 can touch plunger disc 17, and plunger disc 17 can touch the reaction plate 16 that is contained in the first counterbore 23 bottoms.
Those skilled in the art will appreciate that according to the technical solution of the utility model, driving device 6 is used for providing the transmission that rotatablely moves from rotatablely moving to, can adopt the gear system of technology maturation, and it is easy to manufacture and driving efficiency is high.Rotatablely move and in the end change straight-line motion into by ball screw, ball screw can provide large magnification ratio for power, therefore need the moment of torsion of input little, and the side force of gear mesh bearing 63 is little, is conducive to reduce the specification requirement of bearing 63.Because the screw rod 40 of ball screw is combined with ball between the two with nut 41, therefore be friction of rolling between parts in the running, the transmission loss of ball screw is little.In addition, ball screw is the mature technology that develops for many years, has had accurate manufacturing process on industry, and the back clearance (backlash) of comparing ball screw with the engagement of traditional screw thread is very little, and setting accuracy is high.Therefore, ball screw can provide rotatablely moving of high efficiency and high position precision straight-line variation.So, generally speaking, high according to the technical solution of the utility model driving efficiency, driving torque is little, accuracy of positioning is high and easy to manufacture and good quality assurance can be provided.Therefore, with respect to the situation that same power-assisted is provided, can adopt than conventional solution actuator 7 parts such as grade of small dimension more according to the technical solution of the utility model, thereby reduce costs and reduce the volume of servo-unit 100; And gear can adopt plastic gear, thereby reduces costs and reduce weight, and the inertia of the drive disk assembly that reduces to rotate.For example, gear system can have the plastic gear that is installed to the steel axle, has good Combination property.
In the situation that concrete, servo-unit 100 can be according to power-assisted drive pattern and two kinds of work patterns of manpower drive pattern.
For example, in the situation that the control elements such as actuator 7 and ECU (Electrical Control Unit) 8 all work, when chaufeur was stepped on brake pedal, input bar 31 was delivered to plunger 32 with external force, and plunger 32 promotes push rod 18 again, drives magnet retainer 812 by key 814 simultaneously.When two magnets 810 of magnet retainer 812 and wherein installation move, stroke sensor 81 will be sensed the variation in magnetic field, thereby detect stroke.ECU (Electrical Control Unit) 8 collects the signal that stroke sensor 81 detects and judges braking requirement, thereby order is as the rotary power of the motor forward running output forward of actuator 7, power is delivered to two output wheels 61,62 through gear transmission with rotary power through the gear system of input rotating shaft 60 inputs as driving device 6; Two output wheels 61,62 to rotatablely move be synchronous, thereby driven in synchronism and two output wheels 61,62 screw rods that can not be connected with the relative rotation respectively 40; Because nut 41 does not rotate, therefore, screw rod 40 is with respect to nut 41 rotations, thereby drive nut 41 is along the forward stroke linear longitudinal movement; Nut 41 promotes boosting disk 42, and boosting disk 42 on boosting platform 20, moves thrust to primary importance thereby promote valve body 2 point-blank; The second counterbore 24 bottoms of valve body 2 first ends 21 are with the zone of thrust in the peripheral annular of reaction plate 16, thereby by reaction plate 16, thrust is passed to the push rod 14 that is arranged on reaction plate 16 outsides, thereby the piston 12 that promotes push rod 14 and be connected to push rod 14 move together, and the while is as the compressed distortion of the spring of the first elastomeric element 51 and storage elasticity potential energy.See also shown in Figure 6ly, wherein show servo-unit 100 according to the schematic diagram of power-assisted drive pattern, and see also shown in Figure 7ly, show that wherein servo-unit 100 reaches the schematic diagram of maximum power-assisted according to the power-assisted drive pattern.What need supplemental instruction is, when push rod 18 travels forward under the promotion of plunger 32, push rod 18 promotes plunger disc 17, usually has the gap between reaction plate 16 and plunger disc 17, behind the gap that push rod 18 promotion plunger discs 17 are eliminated between reaction plates 16 and plunger disc 17, plunger disc 17 is pressed in the central region of reaction plate 16.Reaction plate 16 is generally rubber or similar elastomeric material, the reaction plate 16 of this material has the effect of the transmission pressure of similar liquids when being under pressure, when power-assisted is increasing, the pressure that the zone of the peripheral annular of reaction plate 16 is subject to is increasing, pressure will be delivered to the central region of reaction plate 16 simultaneously, thereby make chaufeur can feel that pressure becomes large, thereby can obtain the good feedback of trampling.Therefore, servo-unit 100 can provide good driving to experience.Pedal thrust is delivered on reaction plate 16 by push rod 18 and plunger disc 17, and the power-assisted of actuator 7 also is applied on reaction plate 16 by valve body 2.Being applied on output push rod 14 by reaction plate 16 with joint efforts of these two power.When the chaufeur loosen the brake, expression no longer needs braking, and the second elastomeric element 52 discharges elastic potential energy and promotes to input bar 31, and input bar 31 recovers to resting guard under the elastic force impetus of the second elastomeric element 52.Simultaneously, plunger 32 also recovers to resting guard, drive magnet retainer 812 by key 814 simultaneously, stroke sensor 81 will be sensed the variation in magnetic field, thereby detecting stroke changes, ECU (Electrical Control Unit) 8 collects signal that stroke sensor 81 detects and judges braking requirement and be cancelled, thereby order is as the reverse rotary power of motor antiport output of actuator 7, and then driving power-assisted assembly retreats, the first elastomeric element 51 discharges elastic potential energy and promotes valve body 2 simultaneously, and valve body 2 recovers to the second place under the elastic force impetus of the first elastomeric element 51.Alternatively, be provided with rotary angle transmitter (not shown) in actuator 7, the transmitting ratio by data based driving device 6 that rotary angle transmitter is detected under the power-assisted state converts and can learn the position of valve body 2.Pedal promotes in the process of plunger 32, the relative position of ECU (Electrical Control Unit) 8 controllable valve bodies 2 and plunger 32.Servo-unit 100 is in normal power-assisted working process, due to the relative position that remains valve body 2 and plunger 32, so valve body 2 and plunger 32 interaction force longitudinally not.
Again for example, in the situation that the parts such as the control element such as actuator 7, ECU (Electrical Control Unit) 8 or driving device 6 break down and cisco unity malfunction, when chaufeur was stepped on brake pedal, input bar 31 was delivered to plunger 32 with external force, compresses simultaneously the second elastomeric element 52 and storage elasticity potential energy.Plunger 32 promotes push rod 18 again, and plunger 32 drives magnet retainer 812 by key 814 simultaneously; But this moment is because actuator 7 can't provide power-assisted for some reason, so screw rod 40 does not rotate; Because screw rod 40 does not rotate, so nut 41 and boosting disk 42 keeps motionless; Until input block 3 is when arriving activation point, as shown in Figure 7, plunger 32 is resisted against valve body 2; If continue to transmit external force from pedal, input block 3 drives valve body 2 and moves point-blank to primary importance under the further effect of external force; Thereby the piston 12 that valve body 2 promotes push rods 14 and is connected to push rod 14 move together, and the while is as the compressed distortion of the spring of the first elastomeric element 51 and storage elasticity potential energy.If chaufeur unclamps pedal, pedal no longer transmits external force, and is compressed and the first elastomeric element 51 that stored elastic potential energy discharges elastic potential energys and promotes valve body 2, and valve body 2 recovers to the second place under the elastic force impetus of the first elastomeric element 51; Last compressed and the second elastomeric element 52 that stored elastic potential energy also will extend and discharge potential energy, when the second elastomeric element 52 release potential energy, the second elastomeric element 52 driving input blocks 3 move to resting guard.
Those of ordinary skill in the art knows, nut 41 is not limited to realize interlock by a boosting disk 42 to have multiple other forms to realize nut 41 and valve body 2 interlocks with valve body 2.For example, can be provided with bindiny mechanism (not shown) between valve body 2 and nut 41, bindiny mechanism's part is fixed in nut 41, and another part is connected in valve body 2.Particularly, as an example, this bindiny mechanism can be the guide rail mechanism that is connected between nut 41 and valve body 2, and this guide rail mechanism restriction nut 41 relatively rotates with valve body 2 but allows nut 41 and valve body 2 relative sliding vertically in certain stroke.
Compared to existing work-saving device, servo-unit 100 of the present utility model has higher driving efficiency, and, reasonable in design, small volume, with low cost.
The above specific embodiment only is used for explanation the utility model, and is not limitation of the utility model, and the those of ordinary skill in relevant technologies field in the situation that do not break away from scope of the present utility model, can also make a variety of changes and modification.For example, plunger 32 and push rod 18 can integral body be fabricated to a part, can also with other displacement pickups (as, be installed on the angular-motion transducer of pedal etc.) obtain the displacement of input block 3.Therefore all technical schemes that are equal to also belong to category of the present utility model, and scope of patent protection of the present utility model should be defined by the claims.
Claims (14)
1. servo-unit (100), is characterized in that, it comprises:
Valve body (2);
The power-assisted assembly, it comprises ball screw, described ball screw comprise screw rod (40), nut (41) and be matched with described screw rod (40) and nut (41) between some balls, nut (41) and valve body (2) interlock, described nut (41) moves along a straight line on the described screw rod (40) of its cooperation, moves along a straight line thereby drive described valve body (2).
2. servo-unit according to claim 1 (100), wherein, described power-assisted assembly comprises at least two secondary ball screws and driving device (6), described driving device (6) comprises input rotating shaft (60), described input rotating shaft (60) and described screw rod (40) interlock, and the rotary power of described input rotating shaft (60) is delivered to every described screw rod (40).
3. servo-unit according to claim 1 (100), wherein, described power-assisted assembly also comprises boosting disk (42), and described nut (41) can not be installed on described boosting disk (42) with the relative rotation, and described power-assisted assembly drives described valve body (2) by described boosting disk (42).
4. servo-unit according to claim 2 (100), it also comprises housing (1), described valve body (2) can longitudinally motion point-blank between primary importance and the second place with respect to described housing (1); In described input rotating shaft (60) when being rotated in the forward, described nut (41) at the described screw rod (40) of its cooperation thus upward move point-blank to described primary importance along the forward stroke straight-line motion described valve body of described power-assisted Component driver (2), when described input rotating shaft (60) contrarotation, described nut (41) at the described screw rod (40) of its cooperation thus upward move point-blank to the described second place along the backward travel straight-line motion described valve body of described power-assisted Component driver (2).
5. servo-unit according to claim 2 (100), it also comprises input block (3), actuator (7), ECU (Electrical Control Unit) (8) and stroke sensor (81), described input block (3) can be in the situation that do not have the power-assisted assembly power-assisted described valve body of driving (2) to move point-blank to described primary importance, actuator (7) can arrive described input rotating shaft (60) by outputting rotary power, described stroke sensor (81) is detected the displacement of described input block (3), the work of described actuator (7) is controlled in the displacement of the described input block (3) that described ECU (Electrical Control Unit) (8) detects according to described stroke sensor (81).
6. servo-unit according to claim 3 (100), wherein, described boosting disk (42) arranges centre hole, described valve body (2) passes described centre hole, described valve body (2) arranges boosting platform (20), and described nut (41) drives described valve body (2) by described boosting disk (42) against described boosting platform (20).
7. servo-unit according to claim 4 (100), it also comprises the first elastomeric element (51), when described valve body (2) moves to described primary importance, described the first elastomeric element (51) elastic deformation and storage of potential energy, when described the first elastomeric element (51) discharged potential energy, described the first elastomeric element (51) drove described valve body (2) and moves to the described second place.
8. servo-unit according to claim 5 (100), wherein, described input block (3) can be with respect to described valve body (2) crank motion between resting guard and activation point, between described input block (3) and described valve body (2), the second elastomeric element (52) is set, in the situation that do not have the described input block of External Force Acting (3) to be remained on described resting guard by the elastic force of the second elastomeric element (52), drive described input block (3) in described activation point motion process in external force, described the second elastomeric element (52) elastic deformation and storage of potential energy, when arriving described activation point, described input block (3) drives described valve body (2) motion under the further effect of described input block (3) in external force, when described the second elastomeric element (52) discharges potential energy, described the second elastomeric element (52) drives described input block (3) and moves to described resting guard.
9. servo-unit according to claim 2 (100), it also comprises the actuator (7) that connects described input rotating shaft (60), described actuator (7) is for exporting the motor of forward and contrarotation power, and the screw rod of described at least two secondary ball screws (40) is arranged axisymmetrically with respect to described valve body (2).
10. servo-unit according to claim 2 (100), wherein, described driving device (6) is gear system, described gear system has the plastic gear that is installed to the steel axle.
11. servo-unit according to claim 5 (100), wherein, described stroke sensor (81) is the magnet medium sensor.
12. servo-unit according to claim 1 (100) wherein, is provided with bindiny mechanism between valve body (2) and nut, a described bindiny mechanism part is fixed in described nut (41), and another part is connected with valve body (2).
13. brake system, it is characterized in that, it comprises the described servo-unit of any one (100) and hydraulic efficiency pressure system according to claim 1 to 12, and described hydraulic efficiency pressure system comprises the have piston master brake cylinder (11) of (12), and described valve body (2) is connected to described piston (12).
14. brake system according to claim 13 wherein, is installed the reaction plate (16) that elastomeric material is made between described valve body (2) and described piston (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220592461 CN203005406U (en) | 2012-11-12 | 2012-11-12 | Booster and brake system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220592461 CN203005406U (en) | 2012-11-12 | 2012-11-12 | Booster and brake system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203005406U true CN203005406U (en) | 2013-06-19 |
Family
ID=48597029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220592461 Expired - Lifetime CN203005406U (en) | 2012-11-12 | 2012-11-12 | Booster and brake system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203005406U (en) |
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| WO2014071876A1 (en) * | 2012-11-12 | 2014-05-15 | 博世汽车部件(苏州)有限公司 | Power assist device and brake system |
| CN105082178A (en) * | 2014-05-08 | 2015-11-25 | 宁夏巨能机器人系统有限公司 | Manipulator power assisting device |
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| WO2017045803A1 (en) * | 2015-09-14 | 2017-03-23 | Robert Bosch Gmbh | Electromechanical brake booster and brake system |
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