CN207096065U - A kind of multifunction road static and dynamic friction coefficient determines car - Google Patents
A kind of multifunction road static and dynamic friction coefficient determines car Download PDFInfo
- Publication number
- CN207096065U CN207096065U CN201720751614.2U CN201720751614U CN207096065U CN 207096065 U CN207096065 U CN 207096065U CN 201720751614 U CN201720751614 U CN 201720751614U CN 207096065 U CN207096065 U CN 207096065U
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- vehicle frame
- service brake
- brake disk
- roller
- strain
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Abstract
The utility model discloses a kind of multifunction road static and dynamic friction coefficient to determine car, the utility model includes vehicle frame and testing device for friction coefficient, ballast box is provided with described vehicle frame, described ballast box is fixedly connected on vehicle frame by bearing beam, described bottom of frame is provided with two pair rollers, rubber tyre is provided with described roller, velometer is provided with roller, described testing device for friction coefficient includes strain-type force meter, the other end of described strain-type force meter is provided with hitch frame, described hitch frame is used to connect the tractor for providing power, when tractor is during vehicle frame is pulled.The utility model changes the counterweight of vehicle by adding balancing weight, can determine under the conditions of different tire-contact areas, the friction co-efficient value on road surface, can also determine the coefficient of rolling friction value under different rates, has multifunctionality.
Description
Technical field
It the utility model is related to a kind of static-dynamic measuring friction coefficient car of multifunction road.
Background technology
Pavement skid resistance condition is the important content for embodying road safety quality, and surface friction coefficient is to characterize its skid resistance
Can most important index.Stable surface friction coefficient can provide good safety stock for dispatch driving, be handed over so as to reduce
Interpreter therefore the possibility occurred, therefore the accurate coefficient of friction for detecting and evaluating road surface seems particularly significant.Currently for Lu Biaomo
The method of testing of wiping coefficient is still mainly put with traditional coefficient of friction and tried based on instrument, and this method is disadvantageous in that：(1) pass
The assay method of system can only determine the coefficient of friction under a kind of speed in fixed point quiescent conditions, and its sample frequency is low, precision is low, generation
Table is poor, can not meet the actual driving needs of road surface high speed traveling, and the thick construction road surface of inapplicable test, while when detecting pair
Traffic impact is bigger, and also simply Indirect evaluation is given to the friction, capability of road surfaces；(2) method of testing is to carry out point by point,
Time-consuming, and intensity is big, and efficiency is low, is unfavorable for checking and accepting on road surface or quickly comprehensively obtains traffic information in detection on a large scale；(3)
It in the test operation using pendulum friction coefficient determinator, must be caught due to accommodating the moment fallen with hand, can allow whole dress
Generation vibration is put, accuracy of reading is had a great influence by operator, additionally, there may be pressure calibration difficulty, test result repeatability difference etc.
Shortcoming.During the significance of coefficient of friction is that embody vehicle runs at high speed on road surface, the rolling between tire and road table
The influence to rub to vehicle adhesive force, it, which is determined, should also be under high speed, vehicular load truly effect, during tire rolling
Coefficient of rolling friction.Therefore, it is necessary to develop a kind of static-dynamic measuring friction coefficient car of multifunction road, can both determine quiet
State coefficient of friction, it can also survey under high vehicle speeds state, Lu Biao and wheel effect coefficient of friction so as to meet road surface
The requirement of Function detection.
Utility model content
The technical problems to be solved in the utility model is：There is provided a kind of multifunction road static-dynamic measuring friction coefficient car, use
Come coefficient of rolling friction, confficient of static friction and the coefficient of sliding friction of the actual test road surface relative to tire.
In order to solve the above problems, the utility model includes vehicle frame and testing device for friction coefficient, is set on described vehicle frame
Ballast box is equipped with, described ballast box is fixedly connected on vehicle frame by bearing beam, and described bottom of frame is provided with two pairs of rollings
Take turns, rubber tyre is provided with described roller, velometer is provided with roller, described testing device for friction coefficient includes should
Variant dynamometer, one end of described strain-type force meter are fixed on the front center of vehicle frame, described strain-type force meter
The other end is provided with hitch frame, and described hitch frame is used to connect the tractor for providing power, when tractor is pulling vehicle frame
During, plane that the center line of described hitch frame is connected into parallel to all roller lower ends, it is provided with described roller
Brake apparatus, the drawing handle for facilitating people to pull is additionally provided with front side of described vehicle frame.
It is described in the utility model into being provided with connecting shaft between pair roller for the ease of being braked to vehicle frame, it is described
Brake apparatus be arranged in former and later two connecting shafts, described brake apparatus includes service braking device and stopping brake and filled
Put, described service braking device include service brake disk, service brake bar and driving drive rod, described service brake disk with
Vehicle frame is fixedly connected, and is enclosed in the middle part of service brake disk in connecting shaft, and the inside edge of described service brake disk is multistage arc
Shape edge, one end of the camber line of curved edge move closer to the center of service brake disk, the inner side of service brake disk to the other end
Edge sets the cunning to match with curved edge with being provided with braking block rubber before connecting shaft on the outside of described service brake disk
Road, interior slide of described slideway are provided with guide pad, and one end of described guide pad connects through slideway and braking block rubber rotation
Connect, the described bottom of service brake bar and the center of brake disc are hinged, and are provided with described service brake bar and guide pad
Corresponding chute, the other end of described guide pad are movably arranged in chute, and the middle part of described driving drive rod is hinged
In the front end of vehicle frame, connecting rod is hinged between the one end of lower end and service brake bar away from brake disc for drive rod of driving a vehicle；Institute
The stop device stated include stopping brake disk, chuck, brake parking lever and parking drive rod, described stopping brake disk with
Vehicle frame is fixedly connected and is enclosed in connecting shaft, and described chuck includes two panels, and two panels chuck is relative to be slidably arranged in parking system
In Moving plate, the breach of same isosceles right triangle is provided with described two relative edges of chuck, when two panels chuck
When being stitched together, the breach of two chucks is spliced into square, and described breach is enclosed in connecting shaft, in described connecting shaft
The section of the part of face breach is square corresponding with breach, and rack is provided with two described chucks, described
Two racks connect the both sides of same gear respectively, and described pinion rotation is connected on stopping brake disk, described parking system
One end of lever is fixedly connected with gear, and the front side of vehicle frame, the parking driving are hinged in the middle part of described parking drive rod
The lower end of bar and the other end of brake parking lever are hinged with connecting rod, stop and are provided with locking device between drive rod and vehicle frame.
Keep balancing for the ease of ballast box, the beam described in the utility model that bears includes more support bars, described
More support bar uniform intervals are distributed between ballast box and vehicle frame.
For the ease of detecting the travel speed of vehicle frame, velometer described in the utility model is to sense velometer, velometer
The inner side of roller is arranged on, the receiver corresponding with velometer is provided with described vehicle frame, during roller rotates,
The state with receiver face be present in described velometer.
For the ease of reading the data of strain-type force meter and velometer, strain-type force described in the utility model is calculated as
Electronics strain-type force meter, strain-type force meter and velometer are connected with data logger.
The beneficial effects of the utility model are：The utility model is principle by frictional force calculation formula, is set on vehicle frame
Strain-type force meter and hitch frame are put, to simulate friction co-efficient value of the actual road surface relative to tire, this coefficient of friction car both may be used
To determine coefficient of rolling friction value, can also pair roller carry out locking test coefficient of sliding friction value, in test rolling friction system
During numerical value, have the advantages that wiping cycle is short, test pavement is long and test data is more representative.The utility model is matched somebody with somebody by adding
Pouring weight changes the counterweight of vehicle, can determine under the conditions of different tire-contact areas, the friction co-efficient value on road surface, may be used also
To determine the coefficient of rolling friction value under different rates, there is multifunctionality.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 is front view of the present utility model（Ballast box is not marked）；
Fig. 3 is the internal structure schematic diagram of service brake disk；
Fig. 4 is the structure connection diagram of service brake；
Fig. 5 is the structure connection diagram of driving drive rod；
Fig. 6 is the structural representation of stopping brake；
Fig. 7 is the operating diagram of stopping brake.
Wherein：1st, ballast box, 2, bear beam, 3, vehicle frame, 4, roller, 5, velometer, 6, strain-type force meter, 7, traction
Frame, 8, tow handle, 9, connecting shaft, 10, service braking device, 11, stop device, 91, square bar, 101, service brake
Disk, 102, curved edge, 103, braking block rubber, 104, slideway, 105, service brake bar, 106, connecting rod, 107, driving drives
Lever, 111, brake parking lever, 112, rack, 113, gear, 114, chuck, 115, stopping brake disk.
Embodiment
The static-dynamic measuring friction coefficient car of multifunction road as depicted in figs. 1 and 2, including vehicle frame 3 and PVvalue testing
Device, ballast box 1 is provided with described vehicle frame 3, described ballast box 1 is fixedly connected on vehicle frame 3 by bearing beam 2, institute
The beam 2 that bears stated includes more support bars, and more described support bar uniform intervals are distributed between ballast box 1 and vehicle frame 3,
The bottom of described vehicle frame 3 is provided with two pair rollers 4, and rubber tyre is provided with described roller 4, survey is provided with roller 4
Fast device 5, described velometer 5 are sensing velometer, and velometer 5 is arranged on the inner side of roller 4, is provided with described vehicle frame 3
The receiver corresponding with velometer 5, during roller 4 rotates, there is the shape with receiver face in described velometer 5
State, velometer is that roller ran a circle with state of the receiver from the state of face to face next time, by velometer 5
Wheel footpath parameter is set, and velometer 5 can calculate distance travelled number and travel speed, and described testing device for friction coefficient includes should
Variant dynamometer 6, described strain-type force meter 6 are electronics strain-type force meter, strain-type force meter 6 and velometer 5 with
Data logger connects, and data logger is prior art, and data logger is connected with other testing elements, can collect test
The test data of element, shown after uniformly being collected to data, be easy to user's observation to collect, described strain-type force
One end of meter 6 is fixed on the front center of vehicle frame 3, and the other end of described strain-type force meter 6 is provided with hitch frame 7, described
Hitch frame 7 be used to connect the tractor that power is provided, when tractor is during vehicle frame 3 is pulled, described hitch frame 2
The plane that center line is connected into parallel to all lower ends of roller 4, brake apparatus, described vehicle frame are provided with described roller 4
Front side be additionally provided with facilitate people pull drawing handle 8.
As illustrated in figs. 2-7, described in the present embodiment into connecting shaft 9 is provided between pair roller 4, described brake apparatus is set
Put in former and later two connecting shafts 9, described brake apparatus includes service braking device 10 and stop device 11, described
Service braking device includes service brake disk 101, service brake bar 105 and driving drive rod 107, described service brake disk
101 are fixedly connected with vehicle frame 3, and the middle part of service brake disk 101 is enclosed in connecting shaft 9, the inner side of described service brake disk 101
Edge is multistage curved edge 102, and one end of the camber line of curved edge 102 moves closer to service brake disk 101 to the other end
Center, the inside edge of service brake disk 101 is with being provided with braking block rubber 103, described service brake disk before connecting shaft
101 outsides set the slideway 104 to match with curved edge 102, are slided in described slideway 104 and are provided with guide pad, described
Guide pad one end through slideway 104 with braking block rubber 103 be rotatablely connected, the bottom of described service brake bar 105 and
The center of service brake disk 101 is hinged, and the chute corresponding with guide pad is provided with described service brake bar 105, described
The other end of guide pad be movably arranged in chute, the middle part of described driving drive rod 107 is hinged on the front end of vehicle frame 3,
Connecting rod 106 is hinged between the one end of lower end and service brake bar 105 away from brake disc of driving drive rod 107；Described
Stop device 11 includes stopping brake disk 115, chuck 114, brake parking lever 111 and parking drive rod, described parking
Brake disc 115 is fixedly connected and is enclosed in connecting shaft 9 with vehicle frame 3, and described chuck 114 includes two panels, the phase of two panels chuck 114
To being slidably arranged in stopping brake disk 115, the relative edge of described two chucks 114 is provided with same isosceles right angle
The breach of triangle, when two panels chuck 114 is stitched together, the breach of two chucks 114 is spliced into square, and described lacks
Muzzle is in connecting shaft 9, and the part of face breach is square bar 91 in described connecting shaft 9, and the cross section of square bar 91 lacks with square
Mouth is corresponding, rack 112 is provided with two described chucks 114, described two racks 112 connect same gear respectively
113 both sides, described gear 113 are rotatably connected on stopping brake disk 115, one end of described brake parking lever 111 with
Gear 113 is fixedly connected, and the front side of vehicle frame 3, the lower end of the parking drive rod are hinged in the middle part of described parking drive rod
Connecting rod is hinged with the other end of brake parking lever 111, stops and is provided with locking device between drive rod and vehicle frame.
When needing braking during vehicle frame is pulled, if only braking tractor, if vehicle frame is not braking, vehicle frame 3
Because inertia can extrude hitch frame 7 and strain-type force meter 6, hitch frame 7 and strain-type force meter 6 may be caused to damage
Wound, when braking vehicle frame 3, driving drive rod 107 is promoted, driving drive rod 107 pulls service brake bar by connecting rod 106
105 around driving brake disc 101 center rotating, service brake bar 105 drives braking block rubber 103 arcuately side by guide pad
Edge 102 slides, and because curved edge 102 and the spacing of connecting shaft 9 are gradually reduced, brakes the gradual jam-packed connecting shaft of block rubber 103
9, its rotation is hindered, vehicle frame 3 gradually stops；When needing to test force of sliding friction, roller 4 should not rotate, but such as
If fruit uses service brake, because service brake is braking block rubber 103 and the friction catch of connecting shaft 9, roller can not be ensured
Do not rotate, at this moment need to use stopping brake, by manipulating the drive rod that stops, parking drive rod passes through connecting rod and parking
The drive gear 113 of brake bar 111 rotates, and gear 113 drives two chucks 114 to do relative motion by two racks 112, two
The square notch of chuck 114 is just stuck on the square bar 91 of connecting shaft 9, can effectively avoid connecting shaft 9 from rotating.
Operation principle：When carrying out surface friction coefficient testing experiment, carry out unloaded and different numbers are loaded in ballast box
The multigroup test data of balancing weight of amount, in the experiment under carrying out different weight, squared paper need to be first passed through and calculated under different weight
Tire-contact area is simultaneously recorded.Then, external tractor is connected with the present embodiment coefficient of friction car by hitch frame 7, complete
Into the installation and debugging of each element.After on-test, travelled with certain speed drawing friction coefficient car, when reaching needed for test
After speed, remain a constant speed advance, in test segment turn-on data logger, the number of collection velometer 5 and strain-type force meter 6
According in the process it should be noted that keeping the stabilization of the steady and road conditions of speed, test segment should be no less than 500 meters.Take test section
The average value of interior all data is as test result.
When carrying out confficient of static friction experiment and coefficient of sliding friction experiment, pass through 11 stuck connection of stop device
Axle, during tractor is dilatory, the reading of strain-type force meter gradually increases, but vehicle frame still remains stationary state, in car
For frame by the moment of inactive state to sliding mode, the reading of record strain-type force meter is stiction, thus calculates static friction
Coefficient, vehicle frame at the uniform velocity sliding mode when, record strain-type force meter reading be force of sliding friction, thus calculate sliding friction
Power.
The frictional force P of automobile is wheel caused frictional force when being rolled on road surface.Force of rolling friction and loading of tire N
It is directly proportional, i.e.,：
P=f*N
In formula：The reading of P --- frictional force, i.e. strain-type force meter
N --- normal pressure (N)；
F --- coefficient of rolling friction.
In horizontal section, N adds the gravity of balancing weight for the gravity of coefficient of friction car in the present embodiment, according to above-mentioned public affairs
Formula, by determining rolling friction of the wheel between the pulling force needed for road surfaces rolling process, inverse wheel and road surface
Coefficient.
The static-dynamic coefficient of friction of this patent refers to the coefficient of kinetic friction and confficient of static friction, and the wherein coefficient of kinetic friction includes again
Coefficient of rolling friction and the coefficient of sliding friction.
Claims (5)
- A kind of 1. static-dynamic measuring friction coefficient car of multifunction road, it is characterised in that：Filled including vehicle frame and PVvalue testing Put, ballast box is provided with described vehicle frame, described ballast box is fixedly connected on vehicle frame by bearing beam, described vehicle frame Bottom is provided with two pair rollers, and rubber tyre is provided with described roller, and velometer, described friction system are provided with roller Number test device includes strain-type force meter, and one end of described strain-type force meter is fixed on the front center of vehicle frame, described The other end of strain-type force meter be provided with hitch frame, described hitch frame is used to connect the tractor for providing power, when leading Draw car during vehicle frame is pulled, the plane that the center line of described hitch frame is connected into parallel to all roller lower ends, institute Brake apparatus is provided with the roller stated, the drawing handle for facilitating people to pull is additionally provided with front side of described vehicle frame.
- 2. the static-dynamic measuring friction coefficient car of multifunction road according to claim 1, it is characterised in that：Described is paired Connecting shaft is provided between roller, described brake apparatus is arranged in former and later two connecting shafts, and described brake apparatus includes Service braking device and stop device, described service braking device include service brake disk, service brake bar and driving Drive rod, described service brake disk are fixedly connected with vehicle frame, are enclosed in the middle part of service brake disk in connecting shaft, described driving The inside edge of brake disc is multistage curved edge, and one end of the camber line of curved edge moves closer to service brake disk to the other end Center, the inside edge of service brake disk is with being provided with braking block rubber before connecting shaft, on the outside of described service brake disk The slideway to match with curved edge is set, is slided in described slideway and is provided with guide pad, one end of described guide pad is worn Slideway and braking block rubber rotation connection are crossed, the bottom and the center of service brake disk of described service brake bar are hinged, described Service brake bar on be provided with the chute corresponding with guide pad, the other end of described guide pad is movably arranged on chute It is interior, the front end of vehicle frame, lower end and the remote system of service brake bar of drive rod of driving a vehicle are hinged in the middle part of described driving drive rod Connecting rod is hinged between one end of Moving plate；Described stop device include stopping brake disk, chuck, brake parking lever and Stop drive rod, and described stopping brake disk is fixedly connected and is enclosed in connecting shaft with vehicle frame, and described chuck includes two panels, Two panels chuck is relative to be slidably arranged in stopping brake disk, and same isosceles are provided with described two relative edges of chuck The breach of right angled triangle, when two panels chuck is stitched together, the breach of two chucks is spliced into square, described breach It is enclosed in connecting shaft, the section of the part of face breach is corresponding with breach square in described connecting shaft, and described two Rack is provided with individual chuck, described two racks connect the both sides of same gear, the connection of described pinion rotation respectively On stopping brake disk, one end of described brake parking lever is fixedly connected with gear, the middle part hinge of described parking drive rod The front side of vehicle frame is connected on, the lower end of the parking drive rod and the other end of brake parking lever are hinged with connecting rod, parking driving Locking device is provided between bar and vehicle frame.
- 3. the static-dynamic measuring friction coefficient car of multifunction road according to claim 1, it is characterised in that：Described bears Beam includes more support bars, and more described support bar uniform intervals are distributed between ballast box and vehicle frame.
- 4. the static-dynamic measuring friction coefficient car of multifunction road according to claim 1, it is characterised in that：Described tests the speed Device is sensing velometer, and velometer is arranged on the inner side of roller, the reception corresponding with velometer is provided with described vehicle frame Device, during roller rotates, there is the state with receiver face in described velometer.
- 5. the static-dynamic measuring friction coefficient car of multifunction road according to any one of claim 1-4, its feature exist In：Described strain-type force is calculated as electronics strain-type force meter, and strain-type force meter and velometer connect with data logger Connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720751614.2U CN207096065U (en) | 2017-06-27 | 2017-06-27 | A kind of multifunction road static and dynamic friction coefficient determines car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720751614.2U CN207096065U (en) | 2017-06-27 | 2017-06-27 | A kind of multifunction road static and dynamic friction coefficient determines car |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207096065U true CN207096065U (en) | 2018-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720751614.2U Expired - Fee Related CN207096065U (en) | 2017-06-27 | 2017-06-27 | A kind of multifunction road static and dynamic friction coefficient determines car |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207096065U (en) |
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2017
- 2017-06-27 CN CN201720751614.2U patent/CN207096065U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180313 Termination date: 20180627 |