CN202228569U - Execution device of car electronic mechanical brake system - Google Patents

Abstract

Translated fromChinese

本实用新型涉及一种汽车电子机械制动系统执行装置，用于解决现有的汽车电子机械制动执行器结构复杂的技术问题。技术方案是电机(7)的转子轴(7-1)与滚柱丝杠副丝杠(5)同轴，由连接部件(6)和键(6-3)紧固连接；键(6-3)配合对转子轴(7-1)与滚柱丝杠副丝杠(5)周向定位，弹簧挡圈(6-1)对转子轴(7-1)与滚柱丝杠副丝杠(5)轴向定位，滚柱丝杠副丝杠(5)与滚柱丝杠副螺母(3)均布数个滚柱(4)，滚柱丝杠副丝杠(5)的螺纹牙和滚柱丝杠副螺母(3)均与滚柱(4)相啮合；制动钳块(2)与滚柱丝杠副螺母(3)紧固为一体。由于采用永磁无刷直流伺服电机，执行部分选用行星滚柱丝杠，省去了齿轮减速机构，执行装置结构更加简单。

The utility model relates to an executive device of an automobile electromechanical brake system, which is used to solve the technical problem of complex structure of the existing automobile electromechanical brake actuator. The technical solution is that the rotor shaft (7-1) of the motor (7) is coaxial with the auxiliary screw (5) of the roller screw, and is tightly connected by the connecting part (6) and the key (6-3); the key (6- 3) Cooperate with the circumferential positioning of the rotor shaft (7-1) and the auxiliary screw of the roller screw (5), and the retaining ring (6-1) aligns the rotor shaft (7-1) and the auxiliary screw of the roller screw (5) Axial positioning, the roller screw auxiliary screw (5) and the roller screw auxiliary nut (3) are evenly distributed with several rollers (4), and the thread teeth of the roller screw auxiliary screw (5) and the roller screw auxiliary nut (3) are engaged with the roller (4); the brake caliper block (2) is fastened together with the roller screw auxiliary nut (3). Since the permanent magnet brushless DC servo motor is used, the planetary roller screw is used in the execution part, the gear reduction mechanism is omitted, and the structure of the execution device is simpler.

Description

Vehicle electromechanical braking system actuating device

Technical field

The utility model relates to a kind of braking system actuating device, particularly relates to a kind of vehicle electromechanical braking system actuating device.

Background technique

In order to improve the active safety performance of automobile, extensively carried out the research that employing electric mechanical braking (hereinafter to be referred as EMB) system replaces traditional hydraulic braking sytem in recent years.Existing EMB generally adopts brush DC servocontrol motor or switched reluctance machines as drive unit, and realizing slowing down through reduction gears mechanism increases the function of turning round, and realizes friction catch by actuator at last.

Common actuator has two kinds of forms, i.e. wedge mechanism and ball screw pair again.General and the larger-size driven gear one of wedge mechanism promotes brake calipers piece realization braking thereby voussoir rotates and produce axial displacement with gear.Adopt ball screw pair leading screw to be linked to each other with output gear as the EMB of brake actuator, feed screw nut and brake calipers piece one, rotatablely moving of leading screw is converted into moving axially of nut and pad the most at last.

With reference to Fig. 9.Document " automotive engineering 2008.10P24-27 such as the development of vehicle electromechanical brake actuator and pressure estimation research [J] Yang Kun " discloses a kind of vehicle electromechanical brake actuator, and this vehicle electromechanical brake actuator comprises motor, planetary gear speed reducing mechanism and ball screw three parts.Wherein rotor 9 is made open-core type, and its nested inside has ball screw pair nut 8 and guarantees moving axially of ball screw pair nut 8, and ball screw pair nut 8 left ends arebrake calipers piece 2 fixedly.The right-hand member of rotor 9 and the sun gear ofplanetary gear train 15 are affixed, and two parts rotate together; The right-hand member ofmotor stator 10 and the gear ring ofplanetary gear train 11 are affixed.Planetwheel 12 is installed onsun gear 15 and keeps its revolution withgear ring 11 inside and by planet carrier 13.Ball screwpair leading screw 14 is withplanet carrier 13 one and with its rotation.

During braking system work, rotor 9 rotates withsun gear 15, slows down to increase through planetary gear train and turns round the back byretainer 13output torques.Retainer 13 is with 14 rotations of ball screw pair leading screw, and ball screw pair nut 8 is converted into rotatablely moving of ball screwpair leading screw 14 straight line motion of ball screw pair nut 8 and promotesbrake calipers piece 2 andcompresses brake disc 1, realizes braking.

During brake off, rotor 9 is withsun gear 15 counterrotatings, slows down to increase through planetary gear train and turns round the back byretainer 13output torques.Retainer 13 is with ball screwpair leading screw 14 rotation, and the rotatablely moving of ball screw adjutant ball screwpair leading screw 14 is converted into the straight line motion of ball screw pair nut 8 and drivesbrake calipers piece 2loosens brake disc 1 compressed brake off.

Disclosed rotor 9 is hollow in the document, and nested inside has ball screw pair nut 8, adopts planetary gear reducing mechanism to realize slowing down to increase turning round.Wherein thesun gear 15 of planetary gear train is fixing with rotor 9, and thegear ring 11 of planetary gear train is fixing withmotor stator 10, and theretainer 13 of planetary gear train is fixing with the leadingscrew 14 of ball screw pair.Owing to will consider the affixed of parts such as each part of planetary gear train and motor, leading screw, the complicated in mechanical structure of system.

Summary of the invention

In order to overcome the baroque deficiency of existing vehicle electromechanical brake actuator, the utility model provides a kind of vehicle electromechanical braking system actuating device.This device adopts brshless DC motor to drive, and do-part is selected the planetary roller leading screw for use, owing to saved reduction gears mechanism, can make the actuating device structure simpler.

The utility model solves the technological scheme that its technical problem adopted: a kind of vehicle electromechanical braking system actuating device; Comprisebrake disc 1,brake calipers piece 2 and motor 7; Brakecalipers piece 2 doubleteam brake discs 1 are characterized in also comprising roller screw pair nut 3, roller 4, roller screwpair leading screw 5 and connected element 6.The rotor shaft 7-1 of said motor 7 is coaxial with roller screwpair leading screw 5, and is fastenedly connected by connectedelement 6 fit key 6-3.Coupling sleeve 6-2 cooperates with key 6-3; Rotor shaft 7-1 and roller screwpair leading screw 5 are circumferentially located; Check ring 6-1 carries out axially locating to rotor shaft 7-1 and roller screwpair leading screw 5; Roller screwpair leading screw 5 is uniformly distributed with several rollers 4 with roller screw pair nut 3, and the worm tooth of roller screwpair leading screw 5 and roller screw pair nut 3 all are meshed with roller 4.Brake calipers piece 2 fastens as one with roller screw pair nut 3.

Said motor 7 is DC permanent-magnetic brushless servocontrol motors.

Said roller screwpair leading screw 5 has identical rotation direction with roller screw pair nut 3, the helix of identical pitch, identical helical pitch, and roller screw pair nut 3 is an internal thread, roller screwpair leading screw 5 is an outside thread.

There is the worm tooth of single line the outside of said roller 4, and its pitch is consistent with the pitch of roller screwpair leading screw 5 and roller screw pair nut 3.

Said connectedelement 6 comprises check ring 6-1, coupling sleeve 6-2, key 6-3, Cock screw 6-4; Said coupling sleeve 6-2 is a tubular construction, and it axially has the logical shape keyway with key 6-3 coupling.Said key 6-3 is threaded the hole; Cock screw 6-4 passes in the keyway of docking part axle head that tapped hole is fixed in key 6-3 rotor shaft 7-1 and roller screwpair leading screw 5; There is circular groove the docking part of rotor shaft 7-1 and roller screwpair leading screw 5 and coupling sleeve 6-2 initial position corresponding part, are used for mounting spring back-up ring 6-1.

The beneficial effect of the utility model is: owing to adopt DC permanent-magnetic brushless servocontrol motor, do-part is selected the planetary roller leading screw for use, has saved reduction gears mechanism, makes that the actuating device structure is simpler.

Below in conjunction with accompanying drawing and embodiment the utility model is elaborated.

Description of drawings

Fig. 1 is the sectional view of the utility model vehicle electromechanical braking system actuating device.

Fig. 2 is the cutaway view Amplified image of connected element among Fig. 1.

Fig. 3 is the axle side enlarged view of Fig. 2 coupling sleeve.

Fig. 4 is that the axle of roller screw pair nut is surveyed enlarged view among Fig. 1.

Fig. 5 is that roller screw pair nut and brake calipers is packaged after joining axle are surveyed enlarged view among Fig. 1.

Fig. 6 is a ball screw auxiliary structure enlarged view among Fig. 1.

The free-body diagram of single wheel when Fig. 7 is braking.

The free-body diagram of brake disc and brake calipers when Fig. 8 is braking.

Fig. 9 is the sectional view of background technique vehicle electromechanical braking system final controlling element.

Among the figure, the 1-brake disc; 2-brake calipers piece; 3-roller screw pair nut; The 4-roller; 5-roller screw pair leading screw; The 6-connected element; The 6-1-check ring; The 6-2-coupling sleeve; The 6-3-key; The 6-4-Cock screw; The 7-motor; The 7-1-motor shaft; 8-ball screw pair nut; The 9-rotor; The 10-motor stator; The 11-gear ring; The 12-planet wheel; The 13-retainer; 14-ball screw pair leading screw; The 15-sun gear; V is a vehicle traveling direction; Fxb is a ground braking force; W is the normal load of wheel; Tp is the thrust of axletree to wheel; Fz faces the normal direction holding power of wheel with being; F is the malleation of brake calipers piece to brake disc; R is the rolling radius of wheel.

Embodiment

It is that example is carried out designing and calculating that present embodiment is got one-sided front-wheel with Santana of Shanghai Automobile Factory 2000 vehicles, and its parameters is as shown in table 1 below:

Table .1 major parameter table

Project	The Vehicle preparation quality	Tyre model	The brake disc external diameter	Radius of clean-up R
					Parameter	1140kg	185/70R1386T	256mm	106mm

The front axle axle load is 60% when supposing stationary vehicle, and two-wheeled load in the left and right sides is identical.During braking, the stressing conditions of wheel is as shown in Figure 2.Fxb is a ground braking force, and the normal load of W wheel, Tp are that axletree is the positive pressure of friction lining to brake disc to the thrust of wheel, normal direction holding power, the F that Fz faces wheel for ground, and unit is N.R is the rolling radius of wheel, and R is effective radius of clean-up of brake disc, and unit is mm.

Consider the influence of the reach of axle load in the braking process, the front-wheel normal force will increase by 50% when static.Therefore can calculate Fz.

Suppose pitch or rigid pavement that braking process is being done; Tire slidingratio 15%-20%, then the peak adhesion coefficient on road surface

is 0.9.Road surface maximum braking force then:

Because be two brake calipers piece chucking brake discs during braking, in order to give full play to the usefulness of brake module, the braking force on the brake disc must be greater than ground braking force.That is:

2FμR≥F_xbr (2)

F is that brake shoe positive pressure, μ are the drag friction factor, gets 0.4, R is that the brake disc radius of clean-up, r are vehicle wheel roll radius.

Calculating the ground maximum braking force by formula (1) is 4617N.By table 1 can calculate for tire rolling radius r be 294.48mm.Bring related data into formula (2) calculating and can get F >=16000N

1) ball screw is selected for use.

Advantages such as ball screw has the transmission efficiency height, precision is high, synchronism is good, long service life.Therefore adopt rotatablely moving of ball screw adjutant motor to be converted into the straight line motion of nut in this brake module.

Given data is following:

Maximum axial work loads F=16000N, material selection GCr15, HRC=60-62.The maximum axial work loads is regarded as maximum dynamic load C, and tabling look-up and selecting used ball screw model is RV20X2.

In EMB when work,, the torque of roller screw pair leading screw should be by formula:

$T=\frac{\mathrm{pF}}{2000\mathrm{\π\η}}---\left(3\right)$

Calculate.With leading screw pitch p=2mm, the secondary efficiency eta of leading screw efficient=0.82, nut shaft gets T=6.214Nm to work loads F=16000N substitution following formula.

2) motor selects for use.

Electromechanical braking system requires motor to have characteristics such as high frequency sound, low inertia.And can satisfy maximum brake torque requirement, therefore preferentially select DC permanent-magnetic brushless servocontrol motor for use.

Power of motor should satisfy:

$P=\frac{\mathrm{Tn}}{9550}---\left(4\right)$

T=6.214Nm wherein, n is that the rated speed of motor is set at 2000r/m.The power of the motor that the substitution following formula is asked is 1.3kw.

With reference to Fig. 1～8.The utility model vehicle electromechanical braking system actuating device comprisesbrake disc 1,brake calipers piece 2, roller screw pair nut 3, roller 4, roller screwpair leading screw 5, connectedelement 6 and motor 7.Brakecalipers piece 2 doubleteam brake discs 1, the rotor shaft 7-1 of said motor 7 is coaxial with roller screwpair leading screw 5, and is fastenedly connected by connectedelement 6 fit key 6-3.Coupling sleeve 6-2 cooperates with key 6-3; Rotor shaft 7-1 and roller screwpair leading screw 5 are circumferentially located; Check ring 6-1 carries out axially locating to rotor shaft 7-1 and roller screwpair leading screw 5; Roller screwpair leading screw 5 is uniformly distributed with several rollers 4 with roller screw pair nut 3, and the worm tooth of roller screwpair leading screw 5 and roller screw pair nut 3 all are meshed with roller 4.Brake calipers piece 2 fastens as one with roller screw pair nut 3.

The rotor shaft 7-1 of motor 7 is coaxial with roller screwpair leading screw 5, and the docking part axle head of rotor shaft 7-1 and roller screwpair leading screw 5 all has semicircle keyway, and the tapped hole of retainingf key is arranged at the keyway bottom.Sidecar has the circular groove of mounting spring back-up ring 6-1 in the keyway, and check ring 6-1 is a standard piece, and coupling sleeve 6-2 matrix is a tubular construction, and portion mills out a logical shape keyway within it.

Connectedelement 6 comprises check ring 6-1, coupling sleeve 6-2, key 6-3, Cock screw 6-4; Said coupling sleeve 6-2 is a tubular construction, and it axially has the logical shape keyway with key 6-3 coupling.Said key 6-3 is threaded the hole; Cock screw 6-4 passes in the keyway of docking part axle head that tapped hole is fixed in key 6-3 rotor shaft 7-1 and roller screwpair leading screw 5; There is circular groove the docking part of rotor shaft 7-1 and roller screwpair leading screw 5 and coupling sleeve 6-2 initial position corresponding part, are used for mounting spring back-up ring 6-1.

During installation, earlier coupling sleeve 6-2 is penetrated the left side of 5 of roller screw pair leading screws, then roller screwpair leading screw 5 is alignd with the rotor shaft 7-1 of motor and put into A type key, and screw in the Cock screw 6-4 at keyway two ends respectively.After the sleeve 6-2 to be connected installation, two check ring 6-1 are placed respectively in the rotor shaft 7-1 and the circular groove on the roller screwpair leading screw 5 of motor.Like this, key 6-3 and coupling sleeve 6-2 have played the circumferential location of rotor shaft 7-1 and 5 liang of between centers of roller screw pair leading screw of motor, have guaranteed the run-in synchronism of motor shaft 7-1 and roller screw pair leading screw 5.Simultaneously, the check ring 6-1 of coupling sleeve 6-2 both sides has played axially locating, prevents coupling sleeve 6-2 axial slip.

Brake calipers piece 2 is circle with the external diameter of roller screw pair nut 3.Four countersunk head unthreaded holes that socket head screw is installed of the circumference uniform distribution of brake calipers piece 2.And, four tapped holes are arranged then in the left side of roller screw pair nut 3.During installation, alignment back, the hole onbrake calipers piece 2 and the roller screw pair nut 3 is screwed in socket head screw,brake calipers piece 2 fastens as one with roller screw pair nut 3 like this.Therefore,brake calipers piece 2 can be realized axially doing with roller screw pair nut 3.

Roller screw pair is selected the molding product of leading screw producer for use.Roller screwpair leading screw 5 contains identical rotation direction with roller screw pair nut 3, the helix of identical pitch, identical helical pitch.Different is that roller screw pair nut 3 is internal thread, and roller screwpair leading screw 5 is an outside thread.Be uniformly distributed with 5-13 the circular roller 4 that number is different at roller screwpair leading screw 5 and roller screw pair nut 3, there is the worm tooth of single line the outside of roller 4, and its pitch is consistent with the pitch of roller screwpair leading screw 5 and roller screw pair nut 3.

During work, roller screwpair leading screw 5 because the worm tooth of roller screwpair leading screw 5 is meshed with roller 4, drives roller 4 around 5 revolution and the rotations of roller screw pair leading screw for driving link rotates, and is similar to the planet wheel in the planetary gear train.Drive roller screw pair nut 3 again in the time of roller 4 motions and produce axial displacement.Finally, thebrake calipers piece 2 of roller screw pair nut 3 its left ends of drive is realized braking and brake off together.

Electromechanical braking system actuating device workflow:

During braking, control motor 7 drives roller screwpair leading screw 5 rotation together, and roller screwpair leading screw 5 is meshed with the worm tooth of roller 4, drives roller 4 and produces rotation and revolution.Roller 4 drives the axial displacement that roller screw pair nut 3 produces left in the process of motion.Because roller screw pair nut 3 andbrake calipers piece 2 one are so thereby brakecalipers piece 2 is implemented the braking function that positive pressure realizes system with roller screw pair nut 3 to left movement and tobrake disc 1.

During brake off, control motor 7 drives 5 counterrotatings together of roller screw pair leading screw, and roller screwpair leading screw 5 is meshed with the worm tooth of roller 4, drives roller 4 and produces rotation and revolution.Roller 4 drives the axial displacement that roller screw pair nut 3 produces left in the process of motion.Because roller screw pair nut 3 andbrake calipers piece 2 one are so thereby brakecalipers piece 2 is implemented the braking function that positive pressure realizes system with roller screw pair nut 3 to left movement and tobrake disc 1.

Present embodiment is changed into the structural type of motor-actuator with the form of original motor-reducing gear-actuator, no longer adopts reducing gear.

Claims (5)

Translated fromChinese

1.一种汽车电子机械制动系统执行装置，包括制动盘(1)、制动钳块(2)和电机(7)，制动钳块(2)包夹制动盘(1)，其特征在于：还包括滚柱丝杠副螺母(3)、滚柱(4)、滚柱丝杠副丝杠(5)和连接部件(6)；所述电机(7)的转子轴(7-1)与滚柱丝杠副丝杠(5)同轴，并由连接部件(6)配合键(6-3)紧固连接；连接套筒(6-2)与键(6-3)配合，转子轴(7-1)与滚柱丝杠副丝杠(5)进行周向定位，弹簧挡圈(6-1)对转子轴(7-1)与滚柱丝杠副丝杠(5)进行轴向定位，滚柱丝杠副丝杠(5)与滚柱丝杠副螺母(3)均布数个滚柱(4)，滚柱丝杠副丝杠(5)的螺纹牙和滚柱丝杠副螺母(3)均与滚柱(4)相啮合；制动钳块(2)与滚柱丝杠副螺母(3)紧固为一体。1. An executive device for an automotive electromechanical braking system, comprising a brake disc (1), a brake caliper block (2) and a motor (7), the brake caliper block (2) wrapping the brake disc (1), It is characterized in that it also includes a roller screw auxiliary nut (3), a roller (4), a roller screw auxiliary screw (5) and a connecting part (6); the rotor shaft (7) of the motor (7) -1) It is coaxial with the auxiliary screw of the roller screw (5), and is tightly connected by the connecting part (6) with the key (6-3); the connecting sleeve (6-2) and the key (6-3) Cooperate, the rotor shaft (7-1) and the auxiliary screw of the roller screw (5) are positioned circumferentially, and the retaining ring (6-1) aligns the rotor shaft (7-1) with the auxiliary screw of the roller screw ( 5) For axial positioning, the roller screw auxiliary screw (5) and the roller screw auxiliary nut (3) are evenly distributed with several rollers (4), and the thread teeth of the roller screw auxiliary screw (5) and the roller screw auxiliary nut (3) are engaged with the roller (4); the brake caliper block (2) is fastened together with the roller screw auxiliary nut (3).2.根据权利要求1所述的汽车电子机械制动系统执行装置，其特征在于：所述电机(7)是永磁无刷直流伺服控制电机。2. The executive device of the automotive electromechanical braking system according to claim 1, characterized in that: the motor (7) is a permanent magnet brushless DC servo control motor.3.根据权利要求1所述的汽车电子机械制动系统执行装置，其特征在于：所述滚柱丝杠副丝杠(5)与滚柱丝杠副螺母(3)有相同旋向，相同螺距、相同导程的螺旋线，滚柱丝杠副螺母(3)为内螺纹，滚柱丝杠副丝杠(5)为外螺纹。3. The executive device of the automotive electromechanical braking system according to claim 1, characterized in that: the auxiliary screw of the roller screw (5) and the auxiliary nut of the roller screw (3) have the same direction of rotation, the same For the helical wires with the same pitch and lead, the auxiliary screw nut (3) of the roller screw is an internal thread, and the auxiliary screw (5) of the roller screw is an external thread.4.根据权利要求1所述的汽车电子机械制动系统执行装置，其特征在于：所述滚柱(4)的外部有单线的螺纹牙，其螺距与滚柱丝杠副丝杠(5)及滚柱丝杠副螺母(3)的螺距一致。4. The executive device of the automotive electro-mechanical braking system according to claim 1, characterized in that: the outside of the roller (4) has a single thread thread, and its pitch is the same as that of the auxiliary screw (5) of the roller screw. The thread pitch of the auxiliary nut (3) of the roller screw is the same.5.根据权利要求1所述的汽车电子机械制动系统执行装置，其特征在于：所述连接部件(6)包括弹簧挡圈(6-1)、连接套筒(6-2)、键(6-3)、紧定螺钉(6-4)；所述连接套筒(6-2)为筒形结构，其轴向有与键(6-3)匹配的通形键槽；所述键(6-3)带有螺纹孔，紧定螺钉(6-4)穿过螺纹孔将键(6-3)固定于转子轴(7-1)和滚柱丝杠副丝杠(5)的对接部分轴端的键槽中，转子轴(7-1)和滚柱丝杠副丝杠(5)的对接部分与连接套筒(6-2)起始位置对应处有环形槽，用来安装弹簧挡圈(6-1)。5. The executive device of the automotive electromechanical braking system according to claim 1, characterized in that: the connecting part (6) includes a spring retaining ring (6-1), a connecting sleeve (6-2), a key ( 6-3), set screw (6-4); the connecting sleeve (6-2) is a cylindrical structure, and there is a through-shaped keyway matching the key (6-3) in the axial direction; the key ( 6-3) It has a threaded hole, and the set screw (6-4) passes through the threaded hole to fix the key (6-3) on the butt joint of the rotor shaft (7-1) and the auxiliary screw of the roller screw (5) In the keyway of part of the shaft end, there is an annular groove corresponding to the starting position of the connecting sleeve (6-2) at the butt joint between the rotor shaft (7-1) and the auxiliary screw (5) of the roller screw, which is used to install the spring retainer Circle (6-1).

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