CN204188390U - Automotive disc brake brake judder and testing table of screaming - Google Patents

Abstract

The utility model discloses a kind of automotive disc brake brake judder and scream testing table, overcoming at present can not testing vehicle brake judder and the problem of screaming, and it comprises frequency converter, variable-frequency motor, equivalent mass adjustment portion, brake pressure adjustment portion and signal acquisition process part.Variable-frequency motor is arranged on the left end of left testing table, and frequency converter is arranged on the lower end of left testing table, and variable-frequency motor is connected with frequency converter electric wire; Equivalent mass adjustment portion is arranged on the left testing table on the right side of variable-frequency motor, variable-frequency motor adopts No. 2 elastic dowel pin shaft couplings to be connected with main shaft left end in equivalent mass adjustment portion, on the right-hand member that brake pressure adjustment portion is arranged on left testing table and right testing table, main shaft right-hand member adopts No. 1 elastic dowel pin shaft coupling to be connected with the semiaxis left end in equivalent mass adjustment portion, and the right-hand member of semiaxis is arranged on the b support in brake pressure adjustment portion; Signal acquisition process part adopts a support and e support installing on right testing table left end and left testing table.

Description

Automotive disc brake brake judder and testing table of screaming

Technical field

The utility model relates to a kind of test unit of vehicle testing technical field, and or rather, the utility model relates to a kind of automotive disc brake brake judder and screams testing table.

Background technology

Brake judder refers to that steering wheel, brake pedal, body platform and seat that vehicle implements to cause when braking in certain vehicle speed range are shaken and the phenomenon of screaming strongly with screaming, it is the one of braking the vibration caused, according to the occurrence frequency of brake judder, it can be divided three classes, and namely low-frequency jitter, intermediate frequency vibration are screamed with high frequency.

When brake judder generally occurs in high vehicle speeds and implements the vibration of medium tenacity, the control stability of this shake to vehicle has a significant effect, and has and increases the fatigue strength of driver and the possibility of maloperation.

At present, domestic still rare with the research of testing table of screaming to brake judder, each enterprise adopts real steering vectors when doing brake judder and screaming and test, and is subject to the limitation of place and real vehicle condition like this, testing expense is increased in test process, test becomes complicated, and existing testing table can not load brake inertia during car brakeing, real simulation car brakeing can not shake and scream process, thus make test result only have demonstration effect, lack experimental study and be worth.So be badly in need of making a brake judder testing table and going real simulation car brakeing process, thus the brake judder of authentic testing vehicle with scream.

Summary of the invention

Technical problem to be solved in the utility model overcomes the problem that prior art can not test real vehicles brake judder and scream, and provides a kind of automotive disc brake brake judder and scream testing table.

For solving the problems of the technologies described above, the utility model adopts following technical scheme to realize: described automotive disc brake brake judder includes frequency converter, variable-frequency motor, equivalent mass adjustment portion, brake pressure adjustment portion and signal acquisition process part with testing table of screaming.

Variable-frequency motor is arranged on the left end of left testing table, and frequency converter is arranged on the left testing table below variable-frequency motor, and between variable-frequency motor with frequency converter, electric wire is connected; Equivalent mass adjustment portion is arranged on the left testing table on the right side of variable-frequency motor, variable-frequency motor output shaft adopts No. 2 elastic dowel pin shaft couplings to be connected with the main shaft left end in equivalent mass adjustment portion, on the right-hand member that brake pressure adjustment portion is arranged on left testing table and the right testing table, the right-hand member of main shaft adopts No. 1 elastic dowel pin shaft coupling to be connected with the left end of the semiaxis in equivalent mass adjustment portion, and the right-hand member of semiaxis is arranged on the b support in brake pressure adjustment portion as being rotationally connected; A part in signal acquisition process part adopts a support installing at the left end of right testing table, and the another part in signal acquisition process part adopts e support installing on the left testing table in the right side of No. 2 elastic dowel pin shaft couplings and main shaft front.

Equivalent mass adjustment portion described in technical scheme also includes equivalent mass disk, c support and d support.Main shaft is arranged on d support and c support as being rotationally connected, on the d support being provided with main shaft and the left testing table of c support installing on the right side of variable-frequency motor, equivalent mass disk is arranged on for key is connected on the main shaft between d support with c support, the axis of rotation conllinear of variable-frequency motor, main shaft and semiaxis.

Equivalent mass disk described in technical scheme includes installs main body, second disk that first disk that 2 structures are identical is identical with 2 structures.Described installation main body is disc-like structural member, and the center of installing main body is provided with central through hole, installs in main body and is provided with tapped through hole symmetrical up and down.First described disk is identical with second disc structure, the circle centre position of first disk and second disk is provided with first circular hole and second circular hole, first circular hole is identical with the radius installing the central through hole that main center locates with the radius of second circular hole, second disk that identical first disk of 2 structures is identical with 2 structures is provided with and installs the bolt hole that the tapped through hole in main body aligns, second disk that identical first disk of 2 structures is identical with 2 structures adopts bolt to be arranged on and installs in the first half of main body and the both ends of the surface of the latter half as being fixedly connected with, on two first disks with the inner hole surface of installation main body, be provided with the keyway installing taper key simultaneously.

Brake pressure adjustment portion described in technical scheme also includes brake disc, tensimeter, master cylinder, brake handle, surplus valve and caliper.B support is fixedly mounted on the right-hand member of left testing table, brake disc is arranged on the right-hand member of the semiaxis in equivalent mass adjustment portion, caliper is bolted on b support, oil-in on caliper adopts hydraulic oil pipe to be connected with the oil-out of surplus valve, the drain tap of surplus valve and the liquid storage cylinder in master cylinder adopt oil pipe to be connected, the oil-in of surplus valve is connected with oil pipe with the oil-out of master cylinder, master cylinder is fixedly mounted on right testing table, brake handle is fixed on the right testing table on the right side of master cylinder as being rotationally connected, one end of brake handle is connected with the push rod of master cylinder.

Signal acquisition process part described in technical scheme also includes blimp, refraction target, microphone, laser displacement sensor and laser speed probe.Described blimp covers on around variable-frequency motor, and adopt bolt to be fixed on by blimp on the left testing table table top of left testing table, refraction target is attached on main shaft, laser speed probe is arranged on e support, refraction target aimed at by laser speed probe, microphone and laser displacement sensor are arranged on a support from top to bottom, and the right flank of the brake disc in brake pressure adjustment portion aimed at by microphone with laser displacement sensor.

Blimp described in technical scheme is made up of blimp dodge gate and blimp housing.Pin is adopted to be fixedly connected with in the doorway that blimp dodge gate loads blimp housing.Blimp housing is a rectangular cubic bodily form case type structural member, the bottom of blimp housing is open type, blimp housing forward end is semi-open-type, namely the first half of blimp housing forward end is provided with front panel, the centre position of the bottom of front panel is provided with the front panel semicircle orifice installing variable-frequency motor output shaft, the right and left on blimp housing forward end face and doorway is provided with the housing pin-and-hole earrings of fixing blimp dodge gate, the bottom of blimp housing two side is provided with the flat mount pad of overhanging left plate formula mount pad and the right side, left side wall and the right side wall of the flat mount pad of left plate formula mount pad and the right side and blimp housing are perpendicular, the flat mount pad of left plate formula mount pad and the right side is respectively arranged with equally distributed bolt hole, the blimp cavity of the rectangular cubic bodily form for putting into variable-frequency motor is provided with in blimp housing.

Blimp dodge gate described in technical scheme is a rectangular plate type structural member, the centre position of blimp dodge gate upper end is provided with the dodge gate semicircle orifice installing variable-frequency motor output shaft, the dodge gate semicircle orifice of blimp dodge gate upper end is identical with the radius of the front panel semicircle orifice on blimp housing, the two ends, left and right of blimp dodge gate are provided with dodge gate pin-and-hole earrings, the housing pin-and-hole earrings of blimp housing is identical with the dodge gate pin-and-hole ear-ring structure on blimp dodge gate, the axis of rotation conllinear of the dodge gate pin-and-hole earrings on the housing pin-and-hole earrings of blimp housing and blimp dodge gate.

Compared with prior art the beneficial effects of the utility model are:

1. automotive disc brake brake judder described in the utility model adopts the method changing variable-frequency motor input current frequency to change the rotating speed of variable-frequency motor with testing table of screaming, thus change the rotating speed of brake disc, can be used for simulating the braking procedure under different initial braking speeds like this;

2. automotive disc brake brake judder described in the utility model and the kinetic energy produced when testing table adopts the kinetic energy of equivalent mass disk to replace 1/4th car weights to brake of screaming, equivalent mass disk can change its quality by the method increasing semi-disc simultaneously, the quality of equivalent mass disk is changed while not dismantling testing table, thus the situation during car brakeing of simulation different quality and when the braking of same vehicle front brake disc is braked with rear brake disc, and, method (namely utilizing the method for the adding quality continually varying semi-disc counterweight) measurement quality continuously changing equivalent mass disk quality can be utilized to differ the brake judder of not many vehicle and scream, can vehicle more at the same level brake judder with scream, the front brake disc of same vehicle or the brake judder of rear brake disc can be tested simultaneously and scream,

3. automotive disc brake brake judder described in the utility model and testing table of screaming can also utilize the pretightning force of regulation relief valve, thus braking pressure control during braking under a certain pressure, so both can brake under controlled brake pressure, can analyze again specifically under which brake pressure brake judder with scream the most obvious, but also can under same brake pressure long run test, draw accurate data;

4. the support of automotive disc brake brake judder described in the utility model and scream microphone in testing table and laser displacement sensor and other test equipment be not on same testing table, and the shake caused when so just can reduce the work such as motor is on the impact of experimental result;

5. the squeal that automotive disc brake brake judder described in the utility model and testing table of screaming produce when testing and braking can use blimp in motor cover, in order to avoid its noise impacts measurement result.There is the dodge gate with semicircle orifice before blimp, conveniently place blimp;

6. the support that automotive disc brake brake judder described in the utility model is used with test bed testing of screaming adopts helicitic texture, the vertical rod of support has external thread, the cross bar of sensor installation and nut-welding, like this can the position of reasonable adjusting sensor, makes test result accurate;

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is the schematic diagram that automotive disc brake brake judder described in the utility model forms with test platform structure of screaming;

Fig. 2 be automotive disc brake brake judder described in the utility model with testing table of screaming in test the schematic diagram that brake judder forms with part test platform structure of screaming;

Fig. 3 be automotive disc brake brake judder described in the utility model with testing table of screaming in speed probe is installed the front view that forms of e supporting structure;

Fig. 4 front view that to be automotive disc brake brake judder described in the utility model form with a supporting structure of installation position displacement sensor in testing table of screaming and microphone;

Fig. 5-a is that automotive disc brake brake judder described in the utility model installs the front view of relation with b support in testing table of screaming and brake disc;

Fig. 5-b is that automotive disc brake brake judder described in the utility model installs the rear view of relation with b support in testing table of screaming and brake disc;

Fig. 6-a is automotive disc brake brake judder described in the utility model and the front view of equivalent mass disk in testing table of screaming;

Fig. 6-b is automotive disc brake brake judder described in the utility model and the left view of equivalent mass disk in testing table of screaming;

Fig. 7-a is automotive disc brake brake judder described in the utility model and the front view of blimp in testing table of screaming;

Fig. 7-b is automotive disc brake brake judder described in the utility model and the axonometric projection graph of blimp in testing table of screaming

Axonometric projection graph in Fig. 8 e locating clip that to be automotive disc brake brake judder described in the utility model with laser speed probe in testing table of screaming be arranged on e support;

Axonometric projection graph in Fig. 9 a locating clip that to be automotive disc brake brake judder described in the utility model with microphone in testing table of screaming be arranged on a support;

Figure 10 is automotive disc brake brake judder described in the utility model and the schematic diagram of the relative seat relation of laser speed probe in testing table of screaming and main shaft;

Figure 11 is automotive disc brake brake judder described in the utility model and the schematic diagram of the installation site of equivalent mass disk on main shaft in testing table of screaming;

In figure: 1. frequency converter, 2. variable-frequency motor, 3. blimp, 3-1. blimp dodge gate, 3-2. blimp housing, 3-3. blimp cavity, 3-4. coupling bolt, 4. reflect target, 5. main shaft, 5-1. the shaft shoulder, 6. equivalent mass disk, first disk of 6-1., second disk of 6-2., 6-3. set bolt, 6-4. keyway, 6-5. installs main body, No. 7.1 elastic dowel pin shaft couplings, 8. brake disc, 9. hydraulic oil pipe, 10.a support, 10-1.a locating clip, 11. oil return lines, 12. tensimeters, 13. master cylinders, 14. brake handles, 15. right testing tables, 16, surplus valve, 17. microphones, 18. laser displacement sensors, 19. calipers, 20.b support, 21. semiaxis, 22.c support, 23.d support, 24. left testing tables, the left testing table table top of 24-1., 25.e support, 25-1.e locating clip, 26. laser speed probes, 27.2 number elastic dowel pin shaft coupling, 28. taper keys.

Embodiment

Below in conjunction with accompanying drawing, the utility model is explained in detail:

Described automotive disc brake brake judder comprises frequency converter 1, variable-frequency motor 2, equivalent mass adjustment portion, brake pressure adjustment portion and signal acquisition process part with testing table of screaming.

Consult Fig. 1, the selection of variable-frequency motor 2 will be selected according to the characteristic of load, load mainly equivalent mass disk 6 in this testing table, analyze its characteristic and mainly contain two, one is that equivalent mass disk 6 needs peak torque when just rotating, it is large inertia load, two is after equivalent mass disk 6 rotates, its running is in balance, required torque is large like that when not needing to start, and its torque is in identical state, be in permanent torque motion state, by the variable-frequency motor of the analysis selection permanent torque to load characteristic, by selecting vehicle speed range, thus calculate the range of speeds of main shaft and then draw the range of speeds of variable-frequency motor, table look-up and select its number of pole-pairs recycling formula

$T=J\frac{\mathrm{d\ω}}{\mathrm{dt}}---\left(1\right)$

ω＝2πn (2)

Wherein: the torque capacity needed when T is equivalent mass disk rotational ,+be the moment of inertia of equivalent mass disk, the moment of inertia of equal value that namely 1/4th Automobiles are heavy, unit is kgm ²; ω is the angular velocity of equivalent mass disk, and unit is rad/s; N is the rotating speed of main shaft, and unit is r/min.

Torque capacity T when can show that equivalent mass disk 6 just starts by formula (1) and (2) like this, thus the torque of variable-frequency motor 2 (variable-frequency motor of choice criteria of tabling look-up, the torque T of variable-frequency motor during attentional selection can be selected _zwant to be slightly less than T but 150% of variable-frequency motor will be calculated and be excessively loaded within 1 point), calculate the torque T of variable-frequency motor 2 _zafterwards according to formula

$p=\frac{n{T}_z}{9559}---\left(3\right)$

Wherein: T _zfor the torque that variable-frequency motor is selected, unit is kgm ²; N is the rotating speed of variable-frequency motor, namely the revolution of main shaft, and unit is r/min; P is the power of the variable-frequency motor that will select, and unit is kw.

Calculated the power of variable-frequency motor 2 by formula (3), such variable-frequency motor 2 has just chosen.

Consult Fig. 1, the selection of main shaft 5 and semiaxis 21 size because the torque phase of main shaft 5 and semiaxis 21 with, so two weeks to choose way identical.During selection, first select the material of axle, and look into allowable shear stress [τ] and angle of twist per unit length [θ] that material list finds this material, finally calculate the diameter dimension of axle according to strength condition and rigidity condition.The formula utilized is as follows:

Torsion Section coefficient formula:

$W_p=\frac{\mathrm{\π}{d}^3}{16}---\left(4\right)$

Xsect is to the polar moment of inertia in the center of circle:

$I_p=\frac{\mathrm{\π}{d}^4}{32}---\left(5\right)$

Strength condition formula:

${\mathrm{\τ}}_{\max }=\frac{T}{W_p}\≤\left[\mathrm{\τ}\right]---\left(6\right)$

Rigidity condition formula:

${\mathrm{\θ}}_{\max }=\frac{T}{G_p}\×\frac{180}{\mathrm{\π}}\≤\left[\mathrm{\θ}\right]---\left(7\right)$

The diameter d of shaft is calculated by formula (4) and (6) ₁, the diameter d of shaft is calculated by formula (5) and (7) ₂, finally obtain the diameter d=max (d of axle ₁, d ₂), the size of such main shaft 5 and semiaxis 21 just have selected.

Wherein: W _pfor Torsion Section coefficient, unit is m ³; I _pfor xsect is to the polar moment of inertia in the center of circle, unit is m ⁴; τ _maxfor maximum shear stress, unit is P _a; θ _maxfor the torsion angle of maximum unit length, unit is (ο)/m; [τ] is allowable shear stress, and unit is P _a; [θ] allowance unit length torsion angle, unit is (ο)/m; The torque capacity that T needs when being equivalent mass disk rotational.

Consult Figure 11, main shaft 5 is non-standard component, and its diameter is chosen as above, is simultaneously processed with shaft shoulder 5-1 on the right side of main shaft 5, main shaft 5 is processed with keyway, is first installed by equivalent mass disk 6 during installation, then taper key 28 is put into keyway and urgent.The upper and lower surface of key is workplace, and all there is the gradient of 1:100 the upper surface of key and the keyway bottom surface of equivalent mass disk coordinated with it, and are right low left highs.During work, the wedge action by key carrys out transmitting torque, also plays unidirectional axial restraint effect simultaneously.The axial and circumferential motion of equivalent mass disk 6 is limited like this by shaft shoulder 5-1 and taper key 28.Brake disc 8 is standard component, and adopt the brake disc of testing vehicle during test, be provided with taper roll bearing in the end of semiaxis 21, brake disc 8 is connected with taper roll bearing with semiaxis 21, and locates at end shaft end ring.

The rotation of other parts is driven by the rotation of variable-frequency motor 2, it closes between being connected with other parts: the output terminal of variable-frequency motor 2 is connected by No. 2 elastic dowel pin shaft couplings 27 with the left end of main shaft 5, main shaft 5 is connected with equivalent mass disk 6 by taper key 28 again, the right-hand member of main shaft 5 is connected by No. 1 elastic dowel pin shaft coupling 7 with the left end of semiaxis 21, brake disc 8 is connected by taper roll bearing with the right-hand member of semiaxis 21, drive equivalent mass disk 6 and brake disc 8 with same rotational speed like this when variable-frequency motor 2 rotates, the process that simulated automotive travels.

Consult Fig. 1, the selection of frequency converter 1 will notice that its capacity is consistent with the capacity of variable-frequency motor 2, variable-frequency motor 2 is connected with frequency converter 1, the frequency of such change frequency converter 1 just can change the rotating speed of variable-frequency motor 2, thus change the rotating speed of equivalent mass disk 6 and brake disc 8, reach the object of simulation different initial braking speeds, the rotating speed (being also the rotating speed of variable-frequency motor 2) wherein connecting the main shaft of brake disc with the corresponding relation of the test speed of a motor vehicle is:

$n=2.65\frac{v}{r}---\left(8\right)$

Wherein: v is the test speed of a motor vehicle, and unit is Km/h; N is the rotating speed of main shaft 5, and unit is r/min, r is radius of wheel, and unit is m,

Equivalent mass adjustment portion includes main shaft 5 (it being arranged the structures such as shaft shoulder 5-1), equivalent mass disk 6 (main body 6-5 installed by first disk 6-1 and second disk 6-2, set bolt 6-3, keyway 6-4 and equivalent mass disk), semiaxis 21, c support 22, d support 23 and taper key 28;

Consult Fig. 1, main shaft 5, semiaxis 21 and equivalent mass disk 6 all criteria of right and wrong parts, when choosing main shaft 5 and main shaft 21, first select the material of axle, then the calculating of shaft size is carried out according to strength condition and rigidity condition, wherein be processed with keyway at the center section of main shaft 5, be processed with shaft shoulder 5-1 on the right side of keyway, in the center pit of equivalent mass disk 6, process keyway.At the right axle head of semiaxis 21, taper roll bearing is installed, is used for brake disc 8 is installed.C support 22 is the same with the structure of d support 23, and such as the supporting walls of c support 22 is rectangular slabs, the central authorities of rectangular slab is provided with manhole, in manhole, is provided with taper roll bearing.The base of c support 22 is rectangular flat structural members, four angles of base are respectively arranged with a bolt hole, base and c support 22 are fixedly connected with left testing table table top 24-1 by available bolt, c support 22 is all connected by taper roll bearing with d support 23 and main shaft 5, and the axis of rotation of main shaft 5 is parallel with left testing table table top 24-1.

Consult Fig. 6-a and Fig. 6-b, the quality of equivalent mass disk 6 is drawn by 1/4th car weights of simulation real vehicle, a certain material is selected during test, then calculate the size of equivalent mass disk 6, equivalent mass disk 6 is made up of the bolt installing identical second disk 6-2 of main body 6-5, first disk 6-1 that 2 structures are identical, 2 structures identical with 8 structures.

Described installation main body 6-5 is disc-like structural member, and the center of installing main body 6-5 is provided with central through hole, installs on main body 6-5 and is provided with tapped through hole symmetrical up and down.

Described first disk 6-1 is identical with second disk 6-2 structure, the circle centre position of first disk 6-1 and second disk 6-2 is provided with first circular hole and second circular hole, first circular hole is identical with the radius of the central through hole installing main body 6-5 center with the radius of second circular hole, second disk 6-2 that identical first disk 6-1 of 2 structures is identical with 2 structures is provided with and installs the bolt hole that the tapped through hole on main body 6-5 aligns, second disk 6-2 that identical first disk 6-1 of 2 structures is identical with 2 structures adopts bolt in the both ends of the surface of the first half with the latter half of installing main body 6-5 for being fixedly connected with, on two first disk 6-1 with the inner hole surface of installation main body 6-5, be provided with the keyway 6-4 installing taper key 28 simultaneously.In order to main shaft 5 being fixedly connected with equivalent mass disk 6 with taper key.

Consult Figure 11, equivalent mass disk 6 is arranged on the shaft shoulder 5-1 place on main shaft 5, equivalent mass disk 6 right side contacts with shaft shoulder 5-1 and locates, which limit equivalent mass disk 6 axially-movable to the right on axle, simultaneously, equivalent mass disk 6 is connected by taper key 28 with main shaft 5, low on the right side of the left side height of taper key 28, there is the effect of restriction equivalent mass disk 6 axially-movable to the left, it also limits radial displacement simultaneously, the radial direction of such equivalent mass disk 6 on axle and axial displacement are obtained for restriction, the movement on main shaft 5 is not occurred in when making it rotate.

Main shaft 5 is supported on left testing table 24 by c support 22 and d support 23, c support 22 and d support 23 are all provided with taper roll bearing, be used for supports main shaft 5, on main shaft 5 install equivalent mass disk 6 be used for simulating brake time 1/4th car weights braking time produce kinetic energy, and the quality of equivalent mass disk 6 can change its quality with increase first disk 6-1 and second disk 6-2, thus brake condition when can simulate the braking of different car weight, also the car at the same level that the Measures compare mass difference of first disk 6-1 of continuously changing of available increase quality and second disk 6-2 is few brake judder with scream, but also the quality that can change equivalent mass disk 6 to survey braking time front brake disc or rear brake disc brake judder with scream.

Consult Fig. 6-a and Fig. 6-b, equivalent mass disk 6 is connected with first disk 6-1 and second disk 6-2 set bolt 6-3, note when increasing semi-disc the both sides of equivalent mass disk 6 and every side above and below the same semi-disc of symmetry is all installed, prevent equivalent mass disk 6 from when high-speed rotation, oscillation phenomenon occurring, dynamic balancing measurement will be done when starting equivalent mass disk 6 is installed simultaneously, prevent its vibration from having an impact to test result, convenient for installing disk, enough distances to be left between c support 22 and d support 23, the selection principle of this distance is that workman can handled easily spanner when installing version disk.The mathematical formulae wherein used is as follows:

$J_{\mathrm{\α}}=\frac{G_a+\mathrm{\δ}{G}_0}{4g}---\left(9\right)$

$J_{\mathrm{\α}}=\frac{1}{2}m{R}^2---\left(10\right)$

Wherein: J _αbe 1/4th car weight automobiles moment of inertia of equal value, be the moment of inertia of equivalent mass disk, unit is Kgm ²; G ₀for gravity during automobile zero load, unit is N; G _afor automobile full load gravity, unit is N; G is acceleration of gravity m/s ²; δ is the equivalent unladen vehicle weight coefficient of automobile rotary parts; M is the quality of equivalent mass disk, and unit is kg; R is the radius of equivalent mass disk, and unit is m;

The actual quality of 1/4th car weight automobiles and the relation of equivalent mass disk quality can be drawn, the kinetic energy that 1/4th car weights can be replaced to produce with the kinetic energy of equivalent mass disk like this by formula (9) and (10).

There is formula again:

$J_f=\frac{\mathrm{\β}}{1+\mathrm{\β}}\×\frac{G_a+\mathrm{\δ}{G}_0}{4g}\×r^2---\left(11\right)$

$J_r=\frac{\mathrm{\β}}{1+\mathrm{\β}}\×\frac{G_a+\mathrm{\δ}{G}_0}{4g}\×r^2---\left(12\right)$

Wherein: β represents front and back brake braking force partition factor; J _fmoment of inertia corresponding to front brake, unit is m/s ²; J _rmoment of inertia corresponding to rear brake, unit is m/s ²;

Such combination formula above (10), (11) and (12) can calculate the quality of equivalent mass disk 6 when front brake or rear brake are braked, the quality of equivalent mass disk 6 can be changed like this by changing first disk 6-1 and second disk 6-2, the brake judder being used for surveying same vehicle front brake disc or rear brake disc when braking with scream.

Consult Fig. 2, brake pressure adjustment portion includes brake disc 8, hydraulic oil pipe 9, oil return line 11, tensimeter 12, master cylinder 13, brake handle 14, surplus valve 16, caliper 19 and b support 20.

Brake disc 8, master cylinder 13 are standard component, to adopt real vehicle corresponding thereto during test.Can surplus valve 16 and tensimeter 12 be also standard components, and direct-acting overflow valve selected by surplus valve 16, the line pressure chosen when will regulate in testing according to it and show and brake of surplus valve 16 and tensimeter 12.The pressure choosing pipeline when meeting braking of hydraulic oil pipe 9 and oil return line 11 can not destroy the principle of pipeline.Brake handle is non-standard component, and it is an elongate rod, and there is circular hole the centre of bar, and with pin-hinges on testing table, the end of bar is connected with the push rod pin of master cylinder 13.The supporting walls of b support 20 is rectangular slabs, manhole is had in the central authorities of rectangular slab, in manhole, taper roll bearing is installed, the base of b support 20 is rectangular flat structural members, four angles of base are respectively arranged with a bolt hole, base is fixedly connected with left testing table table top 24-1 by available bolt, and b support 20 is connected by taper roll bearing with semiaxis 21.Caliper 19 is fixed on b support 20 by set bolt.

Brake disc 8 is supported on left testing table 24 by semiaxis 21 and b support 20, and caliper 19 is bolted on b support 20, and surplus valve adopts direct-acting overflow valve, and master cylinder adopts the brake disc identical with testing vehicle model with brake disc.

Consult Fig. 2, the hydraulic oil pipe 9 be connected with caliper 19 is connected with hydraulic main cylinder 13 by surplus valve 16, between surplus valve 16 and master cylinder 13, be connected with the brake pressure numerical value that tensimeter 12 is used for showing caliper 19 simultaneously, adopt brake handle 14 to apply pressure simultaneously, thus control master cylinder, handled easily and installation, in operation, by brake handle 14 hydraulic control master cylinder 13, by observing the force value of tensimeter 12, and regulation relief valve 16, pressure in such hydraulic control oil pipe 9, thus the brake pressure of caliper 19 can be controlled, the brake pressure of preconditioning caliper 19 is carried out to the brake pressure needed for test by the pretightning force of regulation relief valve 16, the brake judder under different braking pressure can be simulated like this and scream, simultaneously can also be constant by the pretightning force of surplus valve 16, reach and repeatedly repeatedly test under same brake pressure, the brake judder of brake disc under which brake pressure can be measured and scream obvious.

Consult Fig. 1, signal acquisition process part includes blimp 3, refraction target 4, a support 10, microphone 17, laser displacement sensor 18, e support 25 and laser speed probe 26;

Refraction target 4, microphone 17, laser displacement sensor 18 are all standard components with laser speed probe 26, and it is supporting for wherein reflecting target 4 with laser speed probe 26.A support 10 and e support 25 criteria of right and wrong part, their similar, base is all rectangular cubic, and its cradling piece is cylindrical, and upper end is provided with screw thread.The one end of e support 25 being installed the cross bar of laser speed probe 26 is connected with nut, nut can move up and down on cradling piece, so just conveniently can regulate the position of laser speed probe 26, the other end of cross bar has locating clip, the shape of locating clip is similar to Ω shape, and e locating clip 25-1 has elasticity.A support 10 is installed microphone 17 to be connected with corresponding nut respectively with one end of two cross bars of laser displacement sensor 18, nut can move up and down on cradling piece, so just conveniently can regulate the position of microphone 17 and laser displacement sensor 18, the other end of each cross bar is provided with locating clip, the shape of locating clip is similar to Ω shape, has elasticity.

Consult Fig. 7-a and Fig. 7-b, blimp 3 is made up of blimp dodge gate 3-1 and blimp housing 3-2, blimp housing 3-2 is a rectangular cubic bodily form case type structural member, the front end of blimp housing 3-2 and bottom are half unlimited and open type, and the right and left on blimp housing 3-2 front end face and doorway is provided with the housing pin-and-hole earrings of fixing blimp dodge gate 3-1, blimp dodge gate 3-1 is a rectangular plate type structural member, the centre position of blimp dodge gate 3-1 upper end is provided with the dodge gate semicircle orifice installing variable-frequency motor 2 output shaft, the two ends, left and right of blimp dodge gate 3-1 are also provided with door bolt hole earrings, housing pin-and-hole earrings on blimp housing 3-2 is identical with the dodge gate pin-and-hole ear-ring structure on blimp dodge gate 3-1, the axis of rotation conllinear of the dodge gate pin-and-hole earrings on the housing pin-and-hole earrings of blimp housing 3-2 and blimp dodge gate 3-1, with in the housing pin-and-hole earrings on pin insertion blimp housing 3-2 and blimp dodge gate 3-1 and dodge gate pin-and-hole earrings, blimp dodge gate 3-1 position is fixed after installing blimp dodge gate 3-1.The bottom of blimp housing 3-2 left and right sides wall is provided with the flat mount pad of flatly overhanging left plate formula mount pad and the right side, the left and right sidewall of the flat mount pad of left plate formula mount pad and the right side and blimp housing 3-2 is perpendicular, the flat mount pad of left plate formula mount pad and the right side is respectively arranged with equally distributed bolt hole, the left testing table table top 24-1 of the left testing table 24 corresponding with its bolt hole being provided with four bolts hole, in blimp housing 3-2, being provided with the blimp cavity 3-3 of the rectangular cubic bodily form for putting into variable-frequency motor 2; The open ports of blimp housing 3-2 front end is the semi-enclosed of employing front panel, the centre position of the bottom of front panel is provided with the front panel semicircle orifice installing variable-frequency motor 2 output shaft, the following open section for installation blimp dodge gate 3-1 of front panel and doorway, front panel semicircle orifice is identical with the radius that the centre position of blimp dodge gate 3-1 upper end is provided with the dodge gate semicircle orifice installing variable-frequency motor 2 output shaft, both up and down with together be a full circle.

Consulting Fig. 8, is the scheme of installation of laser speed probe 26, and laser speed probe 26 loads in e locating clip 25-1 and clamped.

Consulting Fig. 9, is the scheme of installation of microphone 17, and microphone 17 loads in a locating clip 10-1 and clamped.

Consult Figure 10, be refraction target 4, main shaft 5, e support 25 and the relative seat relation of laser speed probe 26, reflect target 4 and be attached on main shaft 5, regulate the position of laser speed probe 26, make it aim at refraction target 4.

Consult Fig. 1, reflect the rotating speed that target 4, laser speed probe 26 and e support 25 are used for surveying main shaft 5, refraction target 4 is attached on main shaft 5, laser speed probe 26 is arranged on e support 25, by regulating the position of laser speed probe 26, it is made to aim at refraction target 4, laser reflection is gone back by refraction target 4 by the laser that laser rotating speed sends, reflect back once having enclosed a laser pulse whenever main shaft 5 turns over like this, laser speed probe 26 is a record rotating speed just, thus accurately tests the rotating speed of main shaft 5.Microphone 17 and laser displacement sensor 18 to be all arranged on a support 10 and to adopt locating clip (a locating clip 10-1 and displacement transducer locating clip) to clamp.After installing, a support 10 is placed on the left hand edge of right testing table 15, rotates the nut on a support 10, adjust microphone 17 and laser displacement sensor 18 position respectively, make its each autoregistration brake disc 8.Microphone 17 is used for gathering the screaming of brake disc, and laser displacement sensor 18 is used for gathering the shake of brake disc 8.And a support 10 is placed on the vibration that right testing table also can avoid the service part on left testing table to produce laser displacement sensor 18 is had an impact.Simultaneously, the noise and vibration produced when working for avoiding variable-frequency motor 2 has an impact to test result, during test, variable-frequency motor 2 blimp 3 is covered, make variable-frequency motor 2 in the blimp cavity 3-3 of blimp 3, putting the identical standard bolt of rear use four well is fixed on the left testing table table top 24-1 of left testing table 24 by blimp 3, then blimp dodge gate 3-1 is loaded in the doorway of blimp housing 3-2, and with in the pin-and-hole earrings on pin insertion blimp housing and the pin-and-hole earrings on blimp dodge gate, blimp dodge gate 3-1 is fixed.

Automotive disc brake brake judder is as follows with the annexation of testing table each several part of screaming:

Consult Fig. 1, electric wire is adopted to be connected between frequency converter 1 with variable-frequency motor 2, variable-frequency motor 2 is arranged on the left end of left testing table 24, variable-frequency motor 2 output shaft is connected with main shaft 5 left end by No. 2 elastic dowel pin shaft couplings 27, the axis of rotation of variable-frequency motor 2 output shaft and the axis of rotation conllinear of main shaft 5, main shaft 5 is arranged on left testing table 24 by c support 22 and d support 23, the right-hand member of main shaft 5 is connected with the left end of semiaxis 21 by No. 1 elastic dowel pin shaft coupling 7, the right-hand member of semiaxis 21 adopts bearing to be arranged in the through hole of b support 20 upper end, b support 20 is fixed on the right-hand member of left experiment table 24, brake disc 8 by taper roll bearing be arranged on semiaxis 21 from the external part of b support 20, caliper 19 is bolted on b support 20, oil-in on caliper 19 adopts hydraulic oil pipe 9 to be connected with the oil-out of surplus valve 16, the drain tap of surplus valve 16 adopts oil return line 11 to be connected with the liquid storage cylinder of master cylinder 13, the oil-in of surplus valve 16 adopts hydraulic oil pipe to be connected with master cylinder 13 oil-out pipeline, master cylinder 13 is fixed on the centre position of right testing table 15, brake handle 14 is used for controlling master cylinder 13, be fixed on the right testing table 15 on the right side of master cylinder 13 as hinged, the a support 10 that laser displacement sensor 18 and microphone 17 are housed is placed on the left end of right testing table 15, the e support 25 being provided with laser speed probe 26 is arranged on the right side of No. 2 elastic dowel pin shaft couplings 27 with on the left testing table 24 of main shaft 5 side (front), laser speed probe 26 will be made during placement to aim at refraction target 4, want suitably, ensure the accurate of measurement data.

The signal recorded by laser displacement sensor 18 and microphone 17 above by computing machine after spectrum analysis and correlation analysis process, for scientific research personnel's analyzing and processing.

In sum, by this testing table can testing vehicle braking time brake disc brake judder with scream.

The principle of work of automotive disc brake brake judder and testing table of screaming:

During test, by regulating frequency converter 1, make the frequency shift of its output voltage, so just can control the rotating speed of variable-frequency motor 2, variable-frequency motor 2 output shaft is connected with main shaft 5 left end by No. 2 elastic dowel pin shaft couplings 27, and the right-hand member of main shaft 5 is connected with semiaxis 21 left end by No. 1 elastic dowel pin shaft coupling 7, and main shaft 5 is provided with equivalent mass disk 6, equivalent mass disk 6 passes through the displacement of shaft shoulder 5-1 and taper key 28 restrictive axial and radial direction, thus makes it be fixed on main shaft 5.When testing different vehicle, by adding first disk 6-1 on the two sides of equivalent mass disk 6 and second disk 6-2 simulates different quality car weight.The right-hand member of semiaxis 21 is connected with brake disc 8 by taper roll bearing.Like this by the rotation of variable-frequency motor 2, drive main shaft 5 and semiaxis 21 to rotate, thus drive the rotation of equivalent mass disk 6 and brake disc 8, reach the effect of the automobile speed in simulated driving.Laser speed probe 26 can measure the rotating speed of main shaft 5, the speed of a motor vehicle corresponding under just can obtaining this rotating speed by formula scales;

Master cylinder 13 is fixed on right testing table 15, master cylinder 13 adopts hydraulic oil pipe 9 to be connected with caliper 19, hydraulic oil pipe 9 is provided with surplus valve 16 and tensimeter 12, by the brake pressure in the pretightning force adjustable brake hydraulic oil pipe 9 of regulation relief valve 16, the oil return line 11 of surplus valve 16 is connected with the liquid storage cylinder of master cylinder 13 simultaneously, can the force value in hydraulic control oil circuit 9 be so just a fixed value, check corresponding pressure value by tensimeter 12.Like this by suppressing fixed handle 14 downwards, control master cylinder 13, master cylinder 13 controls caliper 19 by hydraulic pressure, and caliper 19 pairs of brake discs 8 apply the effect that pressure reaches braking.

In the process of brake disc braking, microphone 17 and laser displacement sensor 18 measure screaming and shake of its generation respectively, the signal recorded by laser displacement sensor 18 and microphone 17 by computing machine, is drawn automotive disc brake brake judder and screams situation after spectrum analysis and correlativity process.

Claims (7)

1. an automotive disc brake brake judder and testing table of screaming, it is characterized in that, described automotive disc brake brake judder includes frequency converter (1), variable-frequency motor (2), equivalent mass adjustment portion, brake pressure adjustment portion and signal acquisition process part with testing table of screaming;

Variable-frequency motor (2) is arranged on the left end of left testing table (24), frequency converter (1) is arranged on the left testing table (24) below variable-frequency motor (2), and between variable-frequency motor (2) with frequency converter (1), electric wire is connected, equivalent mass adjustment portion is arranged on the left testing table (24) on variable-frequency motor (2) right side, variable-frequency motor (2) output shaft adopts No. 2 elastic dowel pin shaft couplings (27) to be connected with main shaft (5) left end in equivalent mass adjustment portion, on the right-hand member that brake pressure adjustment portion is arranged on left testing table (24) and right testing table (15), the right-hand member of main shaft (5) adopts No. 1 elastic dowel pin shaft coupling (7) to be connected with the left end of the semiaxis (21) in equivalent mass adjustment portion, the right-hand member of semiaxis (21) is arranged on the b support (20) in brake pressure adjustment portion as being rotationally connected, a part in signal acquisition process part adopts a support (10) to be arranged on the left end of right testing table (15), and the another part in signal acquisition process part adopts e support (25) to be arranged on the right side of No. 2 elastic dowel pin shaft couplings (27) and the left testing table (24) in main shaft (5) front.

2. according to automotive disc brake brake judder according to claim 1 and testing table of screaming, it is characterized in that, described equivalent mass adjustment portion also includes equivalent mass disk (6), c support (22) and d support (23);

Main shaft (5) is arranged on d support (23) and c support (22) as being rotationally connected, the d support (23) being provided with main shaft (5) is arranged on the left testing table (24) on variable-frequency motor (2) right side with c support (22), equivalent mass disk (6) is arranged on for key is connected on the main shaft (5) between d support (23) with c support (22), the axis of rotation conllinear of variable-frequency motor (2), main shaft (5) and semiaxis (21).

3. according to automotive disc brake brake judder according to claim 2 and testing table of screaming, it is characterized in that, described equivalent mass disk (6) includes installs main body (6-5), second disk (6-2) that first disk (6-1) that 2 structures are identical is identical with 2 structures;

Described installation main body (6-5) is disc-like structural member, and the center of installing main body (6-5) is provided with central through hole, installs in main body (6-5) and is provided with tapped through hole symmetrical up and down;

Described first disk (6-1) is identical with second disk (6-2) structure, first disk (6-1) is provided with first circular hole and second circular hole with the circle centre position of second disk (6-2), first circular hole is identical with the radius of the central through hole installing main body (6-5) center with the radius of second circular hole, second disk (6-2) that identical first disk (6-1) of 2 structures is identical with 2 structures is provided with and installs the bolt hole that the tapped through hole in main body (6-5) aligns, second disk (6-2) that identical first disk (6-1) of 2 structures is identical with 2 structures adopt bolt to be arranged on to install the first half of main body (6-5) with in the both ends of the surface of the latter half for being fixedly connected with, on two first disks (6-1) with the inner hole surface of installation main body (6-5), be provided with the keyway (6-4) installing taper key (28) simultaneously.

4. according to automotive disc brake brake judder according to claim 1 and testing table of screaming, it is characterized in that, described brake pressure adjustment portion also includes brake disc (8), tensimeter (12), master cylinder (13), brake handle (14), surplus valve (16) and caliper (19);

B support (20) is fixedly mounted on the right-hand member of left testing table (24), brake disc (8) is arranged on the right-hand member of the semiaxis (21) in equivalent mass adjustment portion, caliper (19) is bolted on b support (20), oil-in on caliper (19) and the oil-out of surplus valve (16) adopt hydraulic oil pipe (9) to be connected, the drain tap of surplus valve (16) adopts oil pipe to be connected with the liquid storage cylinder in master cylinder (13), the oil-in of surplus valve (16) is connected with oil pipe with the oil-out of master cylinder (13), master cylinder (13) is fixedly mounted on right testing table (15), brake handle (14) is fixed on the right testing table (15) on the right side of master cylinder (13) as being rotationally connected, one end of brake handle (14) is connected with the push rod of master cylinder (13).

5. according to automotive disc brake brake judder according to claim 1 and testing table of screaming, it is characterized in that, described signal acquisition process part also includes blimp (3), refraction target (4), microphone (17), laser displacement sensor (18) and laser speed probe (26);

Described blimp (3) covers on variable-frequency motor (2) around, and adopt bolt to be fixed on by blimp (3) on the left testing table table top (24-1) of left testing table (24), refraction target (4) is attached on main shaft (5), laser speed probe (26) is arranged on e support (25), refraction target (4) aimed at by laser speed probe (26), microphone (17) and laser displacement sensor (18) are arranged on a support (10) from top to bottom, the right flank of the brake disc (8) in brake pressure adjustment portion aimed at by microphone (17) with laser displacement sensor (18).

6. according to automotive disc brake brake judder according to claim 5 and testing table of screaming, it is characterized in that, described blimp (3) is made up of blimp dodge gate (3-1) and blimp housing (3-2);

Pin is adopted to be fixedly connected with in the doorway that blimp dodge gate (3-1) loads blimp housing (3-2);

Blimp housing (3-2) is a rectangular cubic bodily form case type structural member, the bottom of blimp housing (3-2) is open type, blimp housing (3-2) front end is semi-open-type, namely the first half of blimp housing (3-2) front end is provided with front panel, the centre position of the bottom of front panel is provided with the front panel semicircle orifice installing variable-frequency motor (2) output shaft, the right and left on blimp housing (3-2) front end face and doorway is provided with the housing pin-and-hole earrings of fixing blimp dodge gate (3-1), the bottom of blimp housing (3-2) two side is provided with the flat mount pad of overhanging left plate formula mount pad and the right side, left side wall and the right side wall of the flat mount pad of left plate formula mount pad and the right side and blimp housing (3-2) are perpendicular, the flat mount pad of left plate formula mount pad and the right side is respectively arranged with equally distributed bolt hole, the blimp cavity (3-3) of the rectangular cubic bodily form for putting into variable-frequency motor (2) is provided with in blimp housing (3-2).

7. according to automotive disc brake brake judder according to claim 6 and testing table of screaming, it is characterized in that, described blimp dodge gate (3-1) is a rectangular plate type structural member, the centre position of blimp dodge gate (3-1) upper end is provided with the dodge gate semicircle orifice installing variable-frequency motor (2) output shaft, the dodge gate semicircle orifice of blimp dodge gate (3-1) upper end is identical with the radius of the front panel semicircle orifice on blimp housing (3-2), the two ends, left and right of blimp dodge gate (3-1) are provided with dodge gate pin-and-hole earrings, the housing pin-and-hole earrings of blimp housing (3-2) is identical with the dodge gate pin-and-hole ear-ring structure on blimp dodge gate (3-1), the axis of rotation conllinear of the dodge gate pin-and-hole earrings on the housing pin-and-hole earrings of blimp housing (3-2) and blimp dodge gate (3-1).