CN104807653B - Drum reaction braking checkout stand brakes axle load redistribution device - Google Patents
Drum reaction braking checkout stand brakes axle load redistribution device Download PDFInfo
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- CN104807653B CN104807653B CN201510242804.7A CN201510242804A CN104807653B CN 104807653 B CN104807653 B CN 104807653B CN 201510242804 A CN201510242804 A CN 201510242804A CN 104807653 B CN104807653 B CN 104807653B
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- electric cylinders
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Abstract
A kind of drum reaction braking checkout stand the present invention relates to vehicle testing technical field brakes axle load redistribution device.The device includes lifting device, movable floor part, support section and signal acquisition process part, and the lifting device, support section are mounted in the pit of below ground, and the movable floor part fixes on the ground；Support section is arranged on the right side of movable floor part, lower part, and sliding block is slidably connected with sliding slot；The lifting device is arranged in movable floor part, lower part, and support plate can pass through the through-hole in movable floor part；Signal acquisition part point includes pressure, laser displacement sensor；The present invention is a kind of to raise automobile back wheel, make tested vehicle run-off the straight in fore-and-aft plane, make the preceding brake force that tested automobile measures on drum reaction braking checkout stand that can really reflect the drum reaction braking checkout stand braking axle load redistribution device of the stopping power of vehicle front brake close to actual value.
Description
Technical field
The present invention relates to a kind of experimental rig of vehicle testing technical field, specifically a kind of drum reaction type braking
Testing stand brakes axle load redistribution device.
Background technology
Automobile brake perfrmance is to ensure that the essential condition of vehicle safety travel, to ensure the safety traffic of automobile, public security vehicle
Pipe portion door and traffic traffic management office regulation, carry out automobile used the detection of braking ability.At present, the experiment of braking ability is tested
Platform mainly has drum reaction braking checkout stand and flush floor type brake tester.
When being detected on drum reaction braking checkout stand, brake tester is reached by inspection automobile, wheel is parked on roller,
Motor driving drum drives vehicle wheel rotation, driver's brake pedal as indicated after vehicle wheel rotational speed stabilization, motor after
Continuous driving drum rotation, generates a torque opposite with braking moment, until control system has adopted data, motor stops turning
It is dynamic.Therefore, when drum reaction braking checkout stand detects, automobile is motionless, is that roller drives vehicle wheel rotation, is a kind of static inspection
Survey, without the axle load transfer amount generated during automobile brake, therefore when cannot test out braking front axle brake device maximum braking force.
When being detected on flush floor type brake tester, retardation test is reached with the speed of 5km/h-10km/h by inspection vehicle
Platform after front and back wheel arrives separately at tablet, puts speed changer in neutral gear, control system prompting driver's brake pedal, automobile
Under the action of inertia, applied on tablet by wheel with brake force opposite effect power in direction equal in magnitude, produce tablet
The brake force of each wheel is measured in raw length travel through force snesor.Therefore, the test process of flush floor type brake tester is dynamic
Process generates axle load transfer in braking process, can measure front axle maximum braking force, but due to being that driver operates automobile and reaches system
Dynamic test platform, the initial velocity braked in this way cannot ensure every time it is identical, so repeat detection property it is poor.
Invention content
The technical problems to be solved by the invention be overcome existing drum reaction braking checkout stand cannot be in vehicle system
The phenomenon that brake force of the front brake after axle load transfer is surveyed when dynamic, provides a kind of drum reaction braking checkout stand brake axle
Lotus redistribution device.The device raises automobile back wheel, makes tested vehicle run-off the straight in fore-and-aft plane, can pass through in this way
The angle of inclination of vehicle is controlled, adjusts the transfer of automobile front-axle axle load, makes the power that the axle load on front axle shifts close to true
The power of axle load transfer, the axle load so as to make to get on the car on front axle in drum reaction braking checkout stand is close to real car on road
True axle load on face during travelling brake approaches the preceding brake force that tested automobile measures on drum reaction braking checkout stand
Actual value can really reflect that the drum reaction braking checkout stand braking axle load of the stopping power of vehicle front brake is reallocated
Device.
Technical solution of the present invention is described with reference to the drawings as follows：A kind of drum reaction braking checkout stand braking axle load is reallocated
Device, the device include lifting device, movable floor part, support section and signal acquisition process part, lifting dress
Put, support section be mounted below ground pit in, the movable floor part fixes on the ground；The lifting dress
Put the right side for being arranged on movable floor part, lower part, one, No. two sliding block 17,19 in lifting device in movable floor part
First, No. two sliding slots 26,21 are slidably connected；The support section is arranged in movable floor part, lower part, in support section
The first support plate 27 can pass through movable floor part in through-hole 25；The signal acquisition part is divided to including two No.1 pressure
31, two No. two pressure sensors 32 of sensor and laser displacement sensor 33, the No.1 pressure sensor 31 are set respectively
It puts inside the centre position of one, No. two sliding block 17,19 upper surfaces, described No. two pressure sensors 32 are separately positioned on activity
Inside the centre position of first and second bearing 23,24 bottoms in floor part, the laser displacement sensor 33 be fixed on
On " Ω " shape locating clip that crossbeam 18 in lifting device welds.
The lifting device has further included 2, No. two the first electric cylinders 1, the second electric cylinders 15, No.1 elastic dowel pin shaft coupling bullets
Property 8, No. five elastic dowel pin shaft couplings 10, six of elastic dowel pin shaft coupling of elastic dowel pin shaft coupling 6, four of pin coupler 4, three
Number 3, No. two 12, No. seven elastic dowel pin shaft couplings 13 of elastic dowel pin shaft coupling, servo motor 14, No.1 reverse box commutating tooths
5, No. two 7, No. three reverse boxs 11 of roller box, 16, No. two reinforced sliding blocks 20 of the reinforced sliding block of No.1, No.1 axis axis 9.
First electric cylinders 1,15 structure of the second electric cylinders are identical, and screw rod therein is threadedly coupled with external drive shaft,
First electric cylinders 1 and the second electric cylinders 15 are arranged in parallel in one, No. two sliding block 17,19 when movable floor 22 is in horizontal and slide into one, two
Number sliding slot 26, the position of 21 bottoms, crossbeam 18 are arranged on vertical with first and second electric cylinders 1,15 between first and second electric cylinders 1,15.
One, No. two reinforced sliding block 16,20 is arranged in first and second electric cylinders 1,15 and first and second electric cylinders 1,15
It is slidably connected；The crossbeam 18 is welded on one, No. two reinforced sliding block 16,20；One, No. two sliding block 17,19 knots
The identical rectangular cubic of structure, the lower surface centre position of one, No. two sliding block 17,19 are welded with the second support plate, this second
The central plane of fagging and the central plane of one, No. two sliding block 17,19 are coplanar, and part is rectangle above the second support plate, under
Face is divided into semicircle, and pin hole is provided on the second support plate semicircle face.
The No.1 axis 5 is identical with No. two 9 structures of axis, 5 rear end of No.1 axis No. three elastic dowel pin shaft couplings 6 and No. two
The output shaft of 7 front end of reverse box is connected, 5 front end of No.1 axis and No. two elastics of input shaft of No.1 reverse box 3
It sells shaft coupling 4 to be connected, the drive shaft No.1 elastic dowel pin shaft coupling 2 of the output shaft of No.1 reverse box 3 and the first electric cylinders 1
It is connected；No. two 9 front ends of axis are connected with No. four elastic dowel pin shaft couplings 8 with the output shaft of No. two 7 rear ends of reverse box, No. two axis
9 rear ends are connected with No. five elastic dowel pin shaft couplings 10 of input shaft of No. three reverse boxs 11, No. three reverse boxs 11
Output shaft is connected with No. six elastic dowel pin shaft couplings 12 of drive shaft of the second electric cylinders 15.
No. seven elastic dowel pin shaft couplings of the output shaft of the servo motor 14 and the input shaft of No. two reverse boxs 7
13 are connected.
First electric cylinders 1, the outside of the second electric cylinders 15 are welded with upper and lower two lifting lugs；The lifting lug left end is
Rectangle, right end is semicircle and is provided with bolt hole；First electric cylinders 1 and the second electric cylinders 15 pass through hanging on the outside of it respectively
The bolt of bolt hole and corresponding position on pit wall on ear is fixed；Former and later two supports are welded on the crossbeam 18
Seat, shape are that the side of close crossbeam 18 is rectangle, and opposite side is semicircle, pin hole is provided in its semicircle face, each
Be provided with slot on support base, one, No. two sliding block 17 of width, the second support plate on 19 lower surfaces thickness, front and rear two support
The central plane of seat is coplanar with No. two sliding slots 21 on movable floor 22 and the central plane of No.1 sliding slot 26 respectively, No.1 sliding block
17 and No. two sliding blocks 19 be connected respectively by pin with former and later two support bases on crossbeam 18；Described 18 one end of crossbeam is provided with
The locating clip that is used to position laser displacement sensor 33 of the shape for " Ω " shape.
The movable floor part has further included movable floor 22, the first bearing 23 and the second bearing 24；
The movable floor 22 is the plate of a rectangular cubic, is provided with through-hole 25 among movable floor 22, the through-hole 25
Length adds the length of a radius of wheel for the length of car gage to be checked, and width is the diameter of 4/5ths wheels；Actively
22 right end of plate is parallel to be provided with No.1 sliding slot 26 and No. two sliding slots 21, and 22 left end of movable floor is welded with front support arm and rear support
Arm；Described one, No. two sliding slot 26,21 rectangular channel identical for structure and about the longitudinal median plane pair of movable floor 22
Claim；The front support arm is identical with the structure of rear support arm, and the back and front supporting arm left end is semicircle, and right end is rectangle, left
There is pin hole at end on semicircle face；First and second bearing 23,24 structures are identical, and to open porose triangle, centre carries for upper end
First slot, the first groove width is identical with the thickness of back and front supporting arm, and lower end is rectangle, and rectangle both sides have two location holes；
First bearing 23 and the second bearing 24 are arranged on the lower end of back and front supporting arm and back and front supporting arm is hinged；Movable floor 22 passes through
First bearing 23 and the second bearing 24 fix on the ground.
Described one, No. two sliding slot 26, the width of 21 cross sections are identical with one, No. two sliding block 17, the length of 19 cross sections；Institute
The upper surface of No.1 sliding slot 26 stated is a flat surface, and following face is provided with one second slot in the middle, and the width of the second slot is
The thickness of second support plate in lifting device.
The support section further includes 28, No. two hydraulic jacks 29 of No.1 hydraulic jack；
First support plate 27 is one first rectangular slab, and the length and width of the first rectangular slab is than movable floor 22
The length and width of middle through-hole 25 is small, and the height of thickness ratio through-hole 25 is small, is 3/4ths of 25 thickness of through-hole；First support plate
There are former and later two support arms in 27 lower surface, is respectively opened on support arm there are one aperture；First support plate 27 and No. two hydraulic pressure
Jack 29 is connected with No.1 hydraulic jack 28 by front and rear support arm with pin respectively；Described one, No. two hydraulic jack
28th, 29 bottom is welded with the second rectangular slab, and respectively there are two bolts hole on the both sides of the second rectangular slab, and four bolts hole are about second
The center of rectangular slab is in a center of symmetry, and one, No. two hydraulic jack 28,29 passes through the second rectangular slab bolt of bottom and bottom surface
Fixed, first support plate 27 is just to positive through-hole 27 when fixed.
The beneficial effects of the invention are as follows：
1. the present invention detects automotive front brake brake force, the detection method first on drum reaction braking checkout stand
As general detection method, automobile back wheel is detected on level ground, front-wheel is parked on drum reaction braking checkout stand
Roller on, at this point, automobile front axle without axle load shift, can thus measure the braking that tested automobile is braked when no axle load shifts
Deceleration degrees of data.Being handled in the braking deceleration data transmission to computer measured, braking deceleration curve is obtained, in the curve
On braking time is divided into equally spaced minizone, ask for mean braking deceleration on every interval of time, this be averaged
Braking deceleration is equivalent to braking deceleration of the vehicle in this section of time interval, and automobile front-axle is calculated using this braking deceleration
Axle load branch value.
2. it in the present invention after the transfer of auto in Braking front axle axle load is calculated, then calculates vehicle and corresponds to axle load transfer
The height being lifted is measured, automobile back wheel is raised using lifting device, automobile is made to lift certain altitude in fore-and-aft plane.In this way
Automobile run-off the straight in fore-and-aft plane makes front axle that axle load transfer occur, and axle load branch value is calculated by braking deceleration
's.
3. the lifting device in the present invention drives using electric cylinders, and with servo motor, controlled by mcu programming
The operating of servo motor accurately controls the height of lifting in this way.So as to control the axle load transfer amount of front axle.
4. having sliding slot and through-hole on the movable floor in the present invention, sliding slot coordinates with the space of slider in lifting device,
Sliding block can slide in sliding slot in lifting process, and the inner surface of the upper surface of sliding block and sliding slot is to completely attach to always, this
Sample lifting device can be fixedly mounted on the ground, do not have to be moved forward and backward during lifting, make the installation of lifting device
It is convenient.The length of through-hole can be that its wheelspan adds one slightly than the wheel distance (mainly for car) of tested automobile on movable floor
Radius of wheel.The width of through-hole is 4/5ths (mainly for cars) of tested automotive wheel diameter.Meanwhile in the present invention also
There is the first support plate, the first support plate is connected with the very useful hinge of hydraulic pressure jin, and when movable floor does not lift, the first support plate is in liquid
Equal with the upper plane of movable floor under the support of pressure jack, when movable floor lifts, hydraulic pressure jin top moves down, and drives
First support plate moves down, and wheel is absorbed in regard to some in through-hole, and in this way when movable floor is raised, through-hole plays fixed
Position effect prevents the tested vehicle in vehicle detection from moving.
5. there is pressure sensor in No.1 sliding block and No. two sliding blocks, when each sliding block slides in corresponding sliding slot, dress
It is in contact in cunning pressure sensor in the block with the bottom surface of sliding slot, for surveying No.1 sliding block and No. two sliding blocks when movable floor lifts
Suffered pressure, the direction of the pressure are upward for Vertical movements floor.The first bearing and the second bearing of fixed movable floor exist
Its bottom surface is equipped with pressure sensor, should for surveying the pressure that the first bearing and the second bearing when movable floor lifts are born
The direction of pressure is upward perpendicular to the ground.One side on crossbeam is fixed with laser displacement sensor with locating clip, for measuring
The height that movable floor lifts.
Description of the drawings
Fig. 1 is the overall structure signal that drum reaction braking checkout stand of the present invention brakes axle load redistribution device
Figure；
Fig. 2 brakes the integrally-built explosion of axle load redistribution device for drum reaction braking checkout stand of the present invention
Figure；
Fig. 3 is the knot that drum reaction braking checkout stand of the present invention brakes lifting device in axle load redistribution device
Structure schematic diagram；
Fig. 4 is the knot that drum reaction braking checkout stand of the present invention brakes support section in axle load redistribution device
Structure schematic diagram；
When Fig. 5 is not raised for trailing wheel in drum reaction braking checkout stand of the present invention braking axle load redistribution device
The schematic front view of the position relationship of wheel and movable floor；
When Fig. 6 is not raised for trailing wheel in drum reaction braking checkout stand of the present invention braking axle load redistribution device
Wheel and movable floor and the axis side schematic diagram of the position relationship of the first support plate；
Vehicle when Fig. 7 is raised for trailing wheel in drum reaction braking checkout stand of the present invention braking axle load redistribution device
The schematic front view of wheel and the position relationship of movable floor；
Vehicle when Fig. 8 is raised for trailing wheel in drum reaction braking checkout stand of the present invention braking axle load redistribution device
Wheel and movable floor and the axis side schematic diagram of the position relationship of the first support plate；
Fig. 9 brakes No.1 pressure sensing in axle load redistribution device for drum reaction braking checkout stand of the present invention
Device is in the schematic diagram of the installation site of No.1 slider top；
Figure 10 is that drum reaction braking checkout stand of the present invention brakes No.1 sliding block in axle load redistribution device
Axis side schematic diagram；
Figure 11 is braked in axle load redistribution device for drum reaction braking checkout stand of the present invention and is fixed actively
The axis side schematic diagram of first bearing of plate；
Figure 12 is braked in axle load redistribution device for drum reaction braking checkout stand of the present invention and is fixed actively
No. two pressure sensors are in the schematic view of the mounting position of the first rest base in first bearing of plate；
Figure 13 for drum reaction braking checkout stand of the present invention brake in axle load redistribution device No. two sliding blocks with
The sectional view of the installation relation of No. two sliding slots；
Figure 14 brakes laser displacement in axle load redistribution device for drum reaction braking checkout stand of the present invention and passes
The schematic diagram of sensor installation relation on crossbeam；
Figure 15 brakes No.1 commutating tooth in axle load redistribution device for drum reaction braking checkout stand of the present invention
Roller box structure diagram；
Figure 16 brakes No. two commutating tooths in axle load redistribution device for drum reaction braking checkout stand of the present invention
Roller box structure diagram.
In figure：1. the first electric cylinders, 2. No.1 elastic dowel pin shaft couplings, 3. No.1 reverse boxs, 4. No. two spring column pins
Shaft coupling, 5. No.1 axis, 6. No. three elastic dowel pin shaft couplings, 7. No. two reverse boxs, 8. No. four elastic dowel pin shaft couplings, 9.
No. two axis, 10. No. five elastic dowel pin shaft couplings, 11. No. three reverse boxs, 12. No. six elastic dowel pin shaft couplings, 13. No. seven
Elastic dowel pin shaft coupling, 14. servo motors, 15. second electric cylinders, the reinforced sliding block of 16. No.1s, 17. No.1 sliding blocks, 18. crossbeams,
19. No. two sliding blocks, 20. No. two reinforced sliding blocks, 21. No. two sliding slots, 22. movable floors, 23. first bearings, 24. second
Seat, 25. through-holes, 26. No.1 sliding slots, 27. first support plates, 28. No.1 hydraulic jacks, 29. No. two hydraulic jacks, 30.
Wheel, 31. No.1 pressure sensors, 32. No. two pressure sensors, 33. laser displacement sensors
Specific embodiment
Refering to Fig. 1, Fig. 2, Fig. 6, Fig. 7, Fig. 8, a kind of drum reaction braking checkout stand brakes axle load redistribution device, should
Device includes lifting device, movable floor part, support section and signal acquisition process part, the lifting device, support
It is partially installed in the pit of below ground, the movable floor part fixes on the ground；The lifting device setting
In the right side of movable floor part, lower part, one, No. two sliding block 17,19 in lifting device and one, No. two in movable floor part
Sliding slot 26,21 is slidably connected；The support section is arranged in movable floor part, lower part, and first in support section
Support plate 27 can pass through the through-hole 25 in movable floor part；The signal acquisition part is divided to including two No.1 pressure sensors
31st, two No. two pressure sensors 32 and laser displacement sensor 33, the No.1 pressure sensor 31 is separately positioned on one,
No. two sliding blocks 17, the centre position the inside of 19 upper surfaces, described No. two pressure sensors 32 are separately positioned on actively plate portion
The centre position the inside of first and second bearing 23,24 bottoms in point, the laser displacement sensor 33 is fixed on to be filled with lifting
On " Ω " shape locating clip that the crossbeam 18 put welds.
Refering to Fig. 3, the lifting device has further included the first electric cylinders 1, the second electric cylinders 15, No.1 elastic dowel pin shaft coupling
2nd, No. two elastic dowel pin shaft coupling 8, five of elastic dowel pin shaft coupling 6, four of elastic dowel pin shaft coupling 4, three spring column pin connection
The elastic dowel pin shaft coupling 12, seven of axis device 10, six elastic dowel pin shaft coupling 13, servo motor 14, No.1 reverse box 3,
7, No. three reverse boxs 11 of No. two reverse boxs, 16, No. two reinforced sliding blocks 20 of the reinforced sliding block of No.1, No.1 axis 5, two
Number axis 9.
First electric cylinders 1,15 structure of the second electric cylinders are identical, all select Europe rule screw electric cylinders.Screw rod therein with
External drive shaft is threadedly coupled, and when the driving shaft rotates, drives screw rod rotation, screw rod drives and moved down on reinforced sliding block again
It is dynamic.The electric cylinders of the model are active in one's movements, and energy auto lock, will not occur any action, safely may be used in the case of unexpected power-off
It leans on.First electric cylinders 1 and the second electric cylinders 15 be arranged in parallel in one, No. two sliding block 17,19 when movable floor 22 is in horizontal slide into one,
No. two sliding slots 26, the position of 21 bottoms, crossbeam 18 are arranged on vertical with first and second electric cylinders 1,15 between first and second electric cylinders 1,15.
Refering to Fig. 1-Fig. 3, described one, No. two reinforced sliding block 16,20 is arranged in first and second electric cylinders 1,15 and
First, two electric cylinders 1,15 are slidably connected；The rectangular cross-section of the crossbeam 18, the length of first electric cylinders, 1 and second electric cylinders 15
The distance between lateral surface, crossbeam 18 are welded on the reinforced sliding block 16 of No.1 and No. two reinforced sliding blocks 20.Described one, two
The identical rectangular cubic of number sliding block 17,19 structures, and with No.1 sliding slot 21 and No. two 26 clearance fits of sliding slot, sliding block can be with
It is free to slide in sliding slot.The fixed position of electric cylinders be exactly when movable floor 22 is in horizontal sliding block slip the position of sliding slot bottom
Put, can be lifted movable floor 22 by moving up and down for electric cylinders, and remember electric cylinders and the first bearing 23 or the second bearing 24 it
Between horizontal distance be s.First, position is welded with the second support plate among the lower surface of No. two sliding blocks 17,19, second support plate
Central plane and one, No. two sliding block 17,19 central plane it is coplanar, part is rectangle above second support plate, lower face
It is divided into semicircle, pin hole is provided on the second support plate semicircle face.The reinforced sliding block 16 of No.1 and No. two reinforced sliding blocks 20
It is the reinforced sliding block in the second electric cylinders 15 and the first electric cylinders 1 respectively, reinforced sliding block is driven by the screw rod in electric cylinders, is led to
Crossing the rotation of screw rod moves up and down reinforced sliding block.Should be from its maximum thrust when choosing electric cylinders, minimum detent torque, stroke with
Speed and accuracy this several respect synthesis are chosen.
Read Fig. 1-Fig. 3, first electric cylinders 1, the second electric cylinders 15 outside be welded with upper and lower two lifting lugs；Described
Lifting lug left end is rectangle, and right end is semicircle and is provided with bolt hole；First electric cylinders 1 and the second electric cylinders 15 pass through respectively
The bolt of the bolt hole and corresponding position on pit wall on lifting lug on the outside of it is fixed；
Former and later two support bases are welded on the crossbeam 18, shape is that the side of close crossbeam 18 is rectangle, separately
Side is semicircle, is provided with pin hole in its semicircle face, is provided with slot on each support base, one, No. two sliding block 17 of width,
The thickness of the second support plate on 19 lower surfaces, the central plane of front and rear two support base respectively with No. two cunnings on movable floor 22
The central plane of slot 21 and No.1 sliding slot 26 is coplanar, and No.1 sliding block 17 and No. two sliding blocks 19 are respectively by pin and crossbeam 18
Former and later two support bases are connected；Described 18 one end of crossbeam is provided with shape as " Ω " shape for positioning laser displacement sensor 33
Locating clip.
Refering to Fig. 3, Figure 15, Figure 16, the No.1 axis 5 is identical with No. two 9 structures of axis, and cross sectional shape is all circle.
No.1 reverse box 3, No. two reverse boxs 7 and No. three reverse boxs 11 are all standard component, 3 He of No.1 reverse box
No. three 11 structures of reverse box are identical, are two-axis spiral bevel gear reverse box, there are two spiral shells for tumbler gear therein
Bevel gear is revolved, and gear installs the central axis upright of latter two gear.No. two reverse boxs 7 are triple axle screw conic tooth
Reverse box is taken turns, tumbler gear therein is there are two spiral bevel gear, and gear installs the central axis of latter two gear
Vertically.It selects to consider to select from gearratio, control mode and peak torque during reverse box；Commutation in reverse box
Gear is bevel gear, and the change in power transmission direction is carried out by it.
5 rear end of No.1 axis is connected with No. three elastic dowel pin shaft couplings 6 with the output shaft of No. two 7 front ends of reverse box, and one
Number 5 front end of axis is connected with No. two elastic dowel pin shaft couplings 4 of input shaft of No.1 reverse box 3, No.1 reverse box 3
Output shaft is connected with the drive shaft No.1 elastic dowel pin shaft coupling 2 of the first electric cylinders 1；No. four spring column pins in No. two 9 front ends of axis
Shaft coupling 8 is connected with the output shaft of No. two 7 rear ends of reverse box, No. two 9 rear ends of axis and the input of No. three reverse boxs 11
Axis is connected with No. five elastic dowel pin shaft couplings 10, and the output shaft of No. three reverse boxs 11 and the drive shaft of the second electric cylinders 15 are with six
Number elastic dowel pin shaft coupling 12 is connected；Lifting device is all mounted on underground, so the space of underground is reasonable.
No. seven elastic dowel pin shaft couplings of the output shaft of the servo motor 14 and the input shaft of No. two reverse boxs 7
13 are connected.The selection of servo motor 14 selects in terms of its torque capacity and rotating speed two, and servo motor 14 is by the monolithic that has programmed
Machine is controlled, it is made to work in real time, so as to control the work of electric cylinders.
Refering to Fig. 1, Fig. 2, Fig. 5, Fig. 6, Figure 11, the movable floor part has further included movable floor 22, first
23 and second bearing 24 of seat；
Plate of the movable floor 22 for a rectangular cubic, the ground away from its one wheel diameter in left side at movable floor 22
The direction right side is provided with the through-hole 25 of a rectangular section, which adds a radius of wheel for the length of car gage to be checked
Length, width be 4/5ths wheels diameter；The length of movable floor 22 can be the diameter of tyres of 5 automobiles to be checked, can use
A diameter of reference of the automobile tire often detected or as the case may be designed, designed, but it is noted that the length of movable floor
Degree is not too long, ensures that movable floor deflection deformation during lifting is not too big, ensures to be elevated when movable floor 22 in this way
When, the left and right wheels of vehicle can be absorbed in through-hole 25, while wheel can also be made to be absorbed in through-hole and be unlikely to too big, in order to avoid actively
The car body of plate and vehicle is collided.In this way when movable floor 22 is elevated, the position of vehicle rear wheel is limited, fixes its position,
Play positioning action.The width of movable floor 22 it is wider than the wheelspan of vehicle to be checked go out two wheel diameters, before and after through-hole 25
Both sides it is each it is wide go out half of wheel diameter, can also by the width of movable floor set it is wider, but in this way the space occupied it is big, and
Lifting is got up also inconvenient.
22 right end of movable floor is parallel to be provided with No.1 sliding slot 26 and No. two sliding slots 21, and 22 left end of movable floor is welded with preceding branch
Brace and rear support arm；Described one, No. two sliding slot 26,21 rectangular channel identical for structure and about the longitudinal direction of movable floor 22
Central plane is symmetrical；The front support arm is identical with the structure of rear support arm, and the back and front supporting arm left end is semicircle, right
It holds as rectangle, left end semicircle has pin hole on face；First bearing 23 of fixed movable floor and the shape and structure of the second bearing 24
It is identical.Shape and structure such as the first bearing 23 is that carrier top half is divided into a triangle, lower half portion as viewed from before bearing
For rectangle, gable is integrated with rectangle part, and rectangle part is a rectangular slab, and on the both sides of the plate, respectively there are two spiral shells
Keyhole, four bolts hole are in a center of symmetry about the center of rectangular slab.Gable has a pin hole in the above, from first
The look centre of triangular plate of the left side of seat 23 is provided with one first slot, and the width of the first slot is the branch of 22 left side of movable floor welding
The thickness of brace.First bearing 23 and the second bearing 24 are arranged on the lower end of back and front supporting arm and back and front supporting arm is hinged；It is living
Dynamic floor 22 is fixed on the ground by the first bearing 23 and the second bearing 24.
Refering to Fig. 1, Fig. 2, Figure 13, it is provided with two backward in the place away from movable floor 22 left side 3 wheel diameter distance
A sliding slot, respectively No. two sliding slots 21 and No.1 sliding slot 26, No. two sliding slots 21 are with No.1 sliding slot 26 about the vertical of movable floor 22
Symmetrical to central plane, No. two sliding slots 21 are identical with the shape and structure of No.1 sliding slot 26.
Described one, No. two sliding slot 26, the width of 21 cross sections are identical with one, No. two sliding block 17, the length of 19 cross sections；Institute
The upper surface of No.1 sliding slot 26 stated is a flat surface, and following face is provided with one second slot in the middle, and the second slot is smaller, second
As long as the thickness of the second support plate that the width of slot is used for being articulated and connected with lifting device for 17 lower surface of No.1 sliding block,
The lower surface of No.1 sliding slot is made to be communicated with the lower surface of movable floor 22 in this way, thus by No.1 sliding block packet in No.1 sliding slot,
No.1 sliding block 17 can be made to be connected through the hinge with lifting device in this way, when movable floor 22 is raised, No.1 sliding block 17 be enable to exist
It is slided in No.1 sliding slot 26.
Refering to Fig. 1, Fig. 2, Fig. 4, the support section further includes 28, No. two hydraulic jacks of No.1 hydraulic jack
29；First support plate 27 is non-standard component, and 28, No. two hydraulic jacks 29 of No.1 hydraulic jack are standard component.No.1 hydraulic pressure
Jack 28 is identical with the structure of No. two hydraulic jacks 29, selects SOV plunger hydraulic jack, selects model
The hydraulic jack of SV19Y25158.Support base is welded on the mandril of hydraulic jack, the front end of support base is rectangle, and rear end is
Semicircle has pin hole in semi-circular portion.It is welded with the second rectangular slab in the bottom of hydraulic jack, the two of the second rectangular slab
Bolt hole there are two side is each, four bolts hole are in a center of symmetry about the center of rectangular slab.When hydraulic jack withstands on lifting operation,
Select the hydraulic jack of suitable tonnage, bearing capacity can not excess load, selecting the bearing capacity of hydraulic jack need to be more than
1.2 times of weight gravity, hydraulic jack minimum altitude is suitable.
First support plate 27 is one first rectangular slab, and the length and width of the first rectangular slab is than movable floor 22
The length and width of middle through-hole 25 is smaller, and the height of thickness ratio through-hole 25 is small, can be 3/4ths of 25 thickness of through-hole；Such energy
The first support plate 27 is made to be moved up and down in through-hole 25 conveniently.
There are former and later two support arms in the lower surface of first support plate 27, is respectively opened on support arm there are one aperture；Described first
Support plate 27 is connect with No. two hydraulic jacks 29 and No.1 hydraulic jack 28 by front and rear support arm with pin respectively；It is described
First, the bottom of No. two hydraulic jacks 28,29 is welded with the second rectangular slab, the both sides of the second rectangular slab respectively there are two bolt hole,
Four bolts hole are in a center of symmetry about the center of the second rectangular slab, and one, No. two hydraulic jack 28,29 passes through the second of bottom
Rectangular slab is fixed with bolt and bottom surface, and first support plate 27 is just to positive through-hole 25 when fixed.
Refering to Fig. 7, Fig. 8, the location diagram of each section device when being lifted for movable floor 22, when in common test knot
Shu Hou will test the situation during brake force of front-wheel when front-wheel has axle load transfer, in test, the first electric cylinders 1 and the second electric cylinders
No. two reinforced sliding blocks 20 and the reinforced sliding block 16 of No.1 in 15 move up, by crossbeam 18 to moving up movable floor 22
Certain altitude is lifted, this is highly calculated by the average braking deceleration measured.Hydraulic jack 28 and 29 moves down simultaneously, makes
First support plate 27 moves down, and trailing wheel is made to be absorbed in through-hole 25, is played in this way when movable floor 22 is lifted to trailing wheel
Positioning action.
Refering to Fig. 9, Figure 10, Figure 13, Figure 14, the signal acquisition part is divided to including two No.1 pressure sensors 31, two
A No. two pressure sensors 32 and laser displacement sensor 33, the No.1 pressure sensor 31 are separately positioned on one, No. two
Sliding block 17, the centre position the inside of 19 upper surfaces.
Refering to Figure 11, Figure 12, described No. two pressure sensors 32 are separately positioned on first and second in movable floor part
Bearing 23, the centre position the inside of 24 bottoms, the laser displacement sensor 33 are welded on the crossbeam 18 in support section.
Refering to Figure 14, laser displacement sensor 33 is positioned by the locating clip being welded on 18 one end of crossbeam, measurement activity
The height that floor 22 is lifted.
When each sliding block slides in corresponding sliding slot, connect mounted in cunning pressure sensor in the block with the bottom surface of sliding slot
It touches, for surveying pressure when movable floor lifts suffered by No.1 sliding block and No. two sliding blocks, the direction of the pressure is for Vertical movements
Plate is upward.The first bearing and the second bearing of fixed movable floor are equipped with pressure sensor in its bottom surface, for surveying when activity
The pressure that the first bearing 23 and the second bearing 24 are born when floor 22 is lifted, the direction of the pressure is upward perpendicular to the ground.In horizontal stroke
One side on beam 18 is fixed with laser displacement sensor 33 with locating clip, for measuring the height that movable floor 22 lifts.
In the case where no axle load shifts, when testing the brake force of vehicle front, movable floor 22 is in horizontal position,
The upper surface of first support plate 27 is equal with the upper surface of movable floor 22, and vehicle front is parked in drum reaction braking checkout stand
On, trailing wheel is parked in the first support plate 27.
In the case where there is axle load transfer, when testing the brake force of vehicle front, movable floor 22 is elevated, and is in and is inclined
Oblique position, the first support plate move down, and automobile back wheel is absorbed in through-hole 25.
Drum reaction braking checkout stand brakes the operation principle of axle load redistribution device：
The height of center of mass h of vehicle to be measured is measured before test with lifting method.Then, it is vehicle front and back wheel to be measured is first stable
It is parked on weighing unit and measures front axle load FfWith rear axle axle load Fr.Then make automobile along perpendicular to anti-force type roller test stand
Experimental bench is driven into the direction of roller, and front-wheel is made smoothly to be parked between two rollers, unclamps parking brake, and speed changer empties
Gear after all preparations are carried out, starts the motor of roller test stand, and roller drives vehicle wheel rotation, can measure in this way
The data of braking deceleration a of the wheel in entire braking process, will be in the braking deceleration data transmission to computer that measured
By analysis, braking deceleration curve is obtained, then braking time is divided into the equally spaced period, is calculated in each period
Go out mean braking deceleration a*。
The axle load value △ F that front axle shifts when can measure braking by formula below in this wayz1：
G=Ff+Fr ⑴
FfL-Gb=0 is (2)
Fz1L=Gb+ma*h ⑶
△Fz1=Fz1-Ff ⑸
Wherein：FfAnd FrFront axle load and rear axle axle load, unit N during stationary vehicle to be measured are represented respectively；Fz1To there is axis
Front axle axle load when lotus shifts, unit N；G automobile gross weights, unit N；L is wheelbase, unit m；B is automobile barycenter to rear
The distance of shaft centre line, unit m；H be automobile height of center of mass, unit m；△Fz1Front axle axle load load transfer during for braking,
Unit is N；M is car mass, unit kg；G is acceleration of gravity, unit m/s2；
When calculating braking after front axle axle load load transfer, it is possible to write program, the program write is implanted into single
Servo motor is controlled to start to work in the time t every section between grade in piece machine, and the speed operated every time is different, such servo electricity
The rotation that machine generates is transmitted to No.1 axis 5 and No. two axis 9 by No. two reverse boxs 7, No.1 axis 5 and No. two axis 9 further through
No.1 reverse box 3 and No. three reverse boxs 11 by rotate changed into the first electric cylinders 1 in the second electric cylinders 15 screw rod it is upper
Lower movement, screw rod drive reinforced sliding block to move up again, and the crossbeam 18 welded together in this way with reinforced sliding block is to moving up
Dynamic, drive No.1 sliding block 17 is moved up with No. two sliding blocks 19 again in this way, and such movable floor 22 will be around being fixed on ground
The first bearing 23 and the second bearing 24 in pin rotation in pin hole, be elevated movable floor 22.First support plate 27 exists
It is moved down under the action of No.1 hydraulic jack 28 and No. two hydraulic jacks 29, the trailing wheel of tested vehicle is absorbed in through-hole 25
In, meanwhile, No.1 sliding block 17 is with No. two sliding blocks 19 respectively in No.1 sliding slot 26 with being slided backward in No. two sliding slots 21.Current axis carries
Lotus reaches Fz1When servo motor be stopped, work is repeated with this, until test terminate.
The calculating process of wherein lift height h is：
Fz1=G-F1-F2·cos(α) ⑹
H=s*tan (α) is (7)
Wherein, Fz1To have front axle axle load during axle load transfer, unit N；G automobile gross weights, unit N；F1It lives to be fixed
First bearing 23 on dynamic floor and the pressure summation of the second bearing 24, unit N；F2For pressure in No.1 sliding block and No. two sliding blocks
The summation of pressure in sensor, unit N；α be movable floor be lifted afterwards with ground into angle, unit for degree；S is hydraulic pressure
The distance between cylinder installation site and the first bearing 23, unit m；The height that h is elevated for movable floor, unit m.
Claims (6)
1. a kind of drum reaction braking checkout stand brakes axle load redistribution device, which is characterized in that the device includes lifting and fills
Put, movable floor part, support section and signal acquisition process part, the lifting device, support section are mounted on ground
In following pit, the movable floor part fixes on the ground；The lifting device is arranged on movable floor part
The right side, lower part, one, No. two sliding block (17,19) in lifting device and one, No. two sliding slot (26,21) in movable floor part
It is slidably connected；The support section is arranged in movable floor part, lower part, the first support plate (27) in support section
The through-hole (25) in movable floor part can be passed through, the support section includes No.1 hydraulic jack (28), No. two hydraulic pressure
Jack (29)；The signal acquisition part is divided to including two No.1 pressure sensors (31), two No. two pressure sensors
(32) and laser displacement sensor (33), the No.1 pressure sensor (31) are separately positioned on one, No. two sliding block (17,19)
Inside the centre position of upper surface, described No. two pressure sensors (32) be separately positioned in movable floor part first,
Inside the centre position of two bearings (23,24) bottom, the laser displacement sensor (33) be fixed on in lifting device
On " Ω " shape locating clip of crossbeam (18) welding.
2. a kind of drum reaction braking checkout stand braking axle load redistribution device according to claim 1, feature exist
In, the lifting device further included the first electric cylinders (1), the second electric cylinders (15), No.1 elastic dowel pin shaft coupling (2), No. two
Elastic dowel pin shaft coupling (4), No. three elastic dowel pin shaft couplings (6), No. four elastic dowel pin shaft couplings (8), No. five spring column pin connection
Axis device (10), No. six elastic dowel pin shaft couplings (12), No. seven elastic dowel pin shaft couplings (13), servo motor (14), No.1 commutation
Gear-box (3), No. two reverse boxs (7), No. three reverse boxs (11), the reinforced sliding block of No.1 (16), No. two it is reinforced
Sliding block (20), No.1 axis (5), No. two axis (9)；
First electric cylinders (1), the second electric cylinders (15) structure are identical, and screw rod therein is threadedly coupled with external drive shaft,
One, No. two sliding block (17,19) is sliding when first electric cylinders (1) are arranged in parallel in movable floor (22) in level with the second electric cylinders (15)
To the position of one, No. two sliding slot (26,21) bottom, crossbeam (18) is arranged between first and second electric cylinders (1,15) and first and second electricity
Cylinder (1,15) is vertical；
One, No. two reinforced sliding block (16,20) be arranged in first and second electric cylinders (1,15) with first and second electric cylinders (1,
15) it is slidably connected；The crossbeam (18) is welded on one, No. two reinforced sliding block (16,20)；One, No. two sliding block
(17,19) rectangular cubic identical for structure, the lower surface centre position of one, No. two sliding block (17,19) are welded with second
Fagging, the central plane of second support plate and the central plane of one, No. two sliding block (17,19) are coplanar, the second support plate it is upper
Face is divided into rectangle, and lower part is semicircle, and pin hole is provided on the second support plate semicircle face；
The No.1 axis (5) is identical with No. two axis (9) structures, No.1 axis (5) rear end with No. three elastic dowel pin shaft couplings (6) with
The output shaft of No. two reverse box (7) front ends is connected, and No.1 axis (5) front end and the input shaft of No.1 reverse box (3) are used
No. two elastic dowel pin shaft couplings (4) are connected, and the output shaft of No.1 reverse box (3) and the drive shaft of the first electric cylinders (1) are with one
Number elastic dowel pin shaft coupling (2) is connected；No. two axis (9) front ends are with No. four elastic dowel pin shaft couplings (8) and No. two reverse boxs
(7) output shaft of rear end is connected, and No. two axis (9) rear ends and the input shaft of No. three reverse boxs (11) are joined with No. five spring column pins
Axis device (10) is connected, and the output shaft of No. three reverse boxs (11) and the drive shaft of the second electric cylinders (15) are joined with No. six spring column pins
Axis device (12) is connected；
No. seven elastic dowel pin shaft couplings of the output shaft of the servo motor (14) and the input shaft of No. two reverse boxs (7)
(13) it is connected.
3. a kind of drum reaction braking checkout stand braking axle load redistribution device according to claim 2, feature exist
In being welded with upper and lower two lifting lugs on the outside of first electric cylinders (1), the second electric cylinders (15)；The lifting lug left end is square
Shape, right end is semicircle and is provided with bolt hole；First electric cylinders (1) and the second electric cylinders (15) are respectively by the outside of it
The bolt of bolt hole and corresponding position on pit wall on lifting lug is fixed；Former and later two branch are welded on the crossbeam (18)
Seat is supportted, shape is that the side of close crossbeam (18) is rectangle, and opposite side is semicircle, and pin hole is provided in its semicircle face,
It is provided with slot on each support base, the thickness of the second support plate on one, No. two sliding block (17,19) lower surface of width is front and rear
The central plane of two support bases respectively with No. two sliding slots (21) on movable floor (22) and the central plane of No.1 sliding slot (26)
Coplanar, No.1 sliding block (17) and No. two sliding blocks (19) are connected respectively by pin with former and later two support bases on crossbeam (18)；
Described crossbeam (18) one end is welded with the locating clip that is used to position laser displacement sensor (33) of the shape for " Ω " shape.
4. a kind of drum reaction braking checkout stand braking axle load redistribution device according to claim 1, feature exist
In the movable floor part has further included movable floor (22), the first bearing (23) and the second bearing (24)；
The movable floor (22) is the plate of a rectangular cubic, and through-hole (25), the through-hole are provided among movable floor (22)
(25) length is the length of car gage to be checked plus the length of a radius of wheel, diameter of the width for 4/5ths wheels；It is living
Dynamic floor (22) right end is parallel is provided with No.1 sliding slot (26) and No. two sliding slots (21), and movable floor (22) left end is welded with front support
Arm and rear support arm；Described one, No. two sliding slot (26,21) rectangular channel identical for structure and indulging about movable floor (22)
It is symmetrical to central plane；The front support arm is identical with the structure of rear support arm, and the back and front supporting arm left end is semicircle,
Right end is rectangle, and left end semicircle has pin hole on face；First and second bearing (the 23,24) structure is identical, and upper end is porose to open
Triangle, centre is with the first slot, and the first groove width is identical with the thickness of back and front supporting arm, and lower end is rectangle, and rectangle both sides are distinguished
Location hole there are two opening；First bearing (23) and the second bearing (24) are arranged on the lower end of back and front supporting arm and back and front supporting arm
It is hinged；Movable floor (22) is fixed on the ground by the first bearing (23) and the second bearing (24).
5. a kind of drum reaction braking checkout stand braking axle load redistribution device according to claim 3, feature exist
In the width of described one, No. two sliding slot (26,21) cross section is identical with the length of one, No. two sliding block (17,19) cross section；Institute
The upper surface of No.1 sliding slot (26) stated is a flat surface, and following face is provided with one second slot, the width of the second slot in the middle
Thickness for the second support plate in lifting device.
6. a kind of drum reaction braking checkout stand braking axle load redistribution device according to claim 1, feature exist
In the support section further includes No.1 hydraulic jack (28), No. two hydraulic jacks (29)；
First support plate (27) is one first rectangular slab, and the length and width of the first rectangular slab is than movable floor (22)
The length and width of middle through-hole (25) is small, and the height of thickness ratio through-hole (25) is small, is 3/4ths of through-hole (25) thickness；First
There are former and later two support arms in the lower surface of support plate (27), is respectively opened on support arm there are one aperture；First support plate (27)
It is connect respectively by front and rear support arm with pin with No. two hydraulic jacks (29) and No.1 hydraulic jack (28)；Described one,
The bottom of No. two hydraulic jacks (28,29) is welded with the second rectangular slab, and the both sides of the second rectangular slab are respectively there are two bolt hole, and four
A bolt hole is in a center of symmetry about the center of the second rectangular slab, and one, No. two hydraulic jack (28,29) passes through the second of bottom
Rectangular slab is fixed with bolt and ground, and first support plate (27) is just to positive through-hole (25) when fixed.
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