CN101576477B - Pavement friction coefficient testing car - Google Patents
Pavement friction coefficient testing car Download PDFInfo
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- CN101576477B CN101576477B CN 200910087361 CN200910087361A CN101576477B CN 101576477 B CN101576477 B CN 101576477B CN 200910087361 CN200910087361 CN 200910087361 CN 200910087361 A CN200910087361 A CN 200910087361A CN 101576477 B CN101576477 B CN 101576477B
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- vertical beam
- pavement friction
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Abstract
The invention relates to a pavement friction coefficient testing car, belonging to the field of road engineering construction. The pavement friction coefficient testing car comprises two testing wheels, a weight box and a traction connection yoke and is characterized in that the testing wheels are connected with each other by a shaft; a vertical beam is fixedly connected below the weight box and is connected with the shaft by a bearing; one end of the traction connection yoke is fixed on the vertical beam, and the other end thereof is connected with an external apparatus; a dynamometer is arranged between the traction connection yoke and the vertical beam; and the dynamometer is electrically connected with a data recorder. The pavement friction coefficient testing car can measure the friction coefficient of a pavement surface at the normal car running speed, overcomes the defect that the pavement friction coefficient is displayed differently in the former conditions of fixed point, lowspeed and high-speed wheel running, and simultaneously can measure the pavement friction coefficient in the condition of different tire grounding pressures.
Description
Technical field
The present invention is mainly used in the scientific research of road engineering field, design and construction field, is designed for the mensuration of pitch or cement pavement skin-friction coefficient especially.
Background technology
The friction factor on road surface is an important indicator of road surface usability, and the big young pathbreaker of friction factor directly influences the driving safety of vehicle, and is along with the continuous development of high-speed transit, also more and more higher for the requirement of road table function.In recent years, the ground surface material of developing at raising road surface friction factor is varied, all effectively raises the friction, capability of road table as the appearance of multiple materials such as antiskid top layer AK series, ultra-thin asphaltum concrete cover-layer.But, current method of testing for road table friction factor is still main based on traditional friction coefficient instrument, the weak point of this method is that (1) its mensuration is at point of fixity, the Indirect evaluation that under the condition of low speed the friction, capability of road surfaces is given, fall after level altitude is hammered in swing arm that the end has the rubber slide block into shape by promoting, measure the pendulum rise of slide block behind the friction eceleration of road surface and estimate the friction size of road table and rubber piece, its index parameter is not a friction factor itself, but passes through the height value indirect expression of balancing point; (2) simultaneously, because its test is that pointwise is carried out, length consuming time, intensity is big, and efficient is low, is unfavorable for comprehensively obtaining fast in the road surface is checked and accepted or detected on a large scale traffic information; (3) significance of friction factor is to embody vehicle in process is run at high speed on the road surface, rolling friction between tire and the road table is to the influence of vehicle adhesion, it is measured also should be under high speed, the true effect of vehicular load, the coefficient of rolling friction in the tire rolling process.Therefore, be necessary to develop a kind of can the actual measurement under the high vehicle speeds state, the equipment of Lu Biao and wheel effect friction factor satisfies the requirement that the road surface functions of use detects.
Summary of the invention
At the blank in this area, the invention provides a kind of can under normal vehicle operation speed, can mensuration under the different kinds of tyre ground pressure, the testing equipment of road surface friction factor is a pavement friction coefficient testing car.
Pavement friction coefficient testing car, comprise two testing wheels, ballast box and traction link, it is characterized in that: described testing wheel links together by axle, described ballast box below is fixedly connected with vertical beam, described vertical beam is connected with axle by bearing, and an end of described traction link is fixed on vertical beam, and the other end links to each other with external equipment, also be connected with dynamometer between described traction link and the vertical beam, described dynamometer is electrically connected with data recorder.
On the wheel hub of described testing wheel knotmeter is installed, the signal receiver that can receive tachometer signal is installed on the described ballast box, described signal receiver is electrically connected with data recorder.
One end of described signal receiver is fixed in the outside of ballast box, and the other end is a free end, nestles up knotmeter.
Be fixed with the vehicle frame balance device on the described vertical beam, described vehicle frame balance device is made up of a leveling board and a vertical plate, and is fixed together in T type mode, and described traction link is fixedlyed connected with the leveling board in the vehicle frame balance device.
Two machinists clamps are arranged on the described traction link, and the leveling board in the described vehicle frame balance device snaps in two machinists clamps, is bolted to connection.
One end of described dynamometer is fixed on the traction link, and the other end is fixed on the vertical panel in the vehicle frame balance device, and dynamometer is arranged on the surface of leveling board of vehicle frame balance device.
Described dynamometry is counted a hydraulic oil cylinder type dynamometer.
Be provided with balancing weight in the described ballast box.
Also be fixed with vibroshock on the described axle.
Also be fixed with bracing frame on the described vertical beam, be positioned at the front and/or the back of wheel.
Central principle of the present invention is: the force of rolling friction P of automobile
fBe wheel when on the road surface, rolling, the friction force that produces because of road surface and squeegee action.It is relevant with road surface kind, state, the speed of a motor vehicle, tire construction and charge pressure.Force of rolling friction is directly proportional with loading of tire (axle carries) G, that is:
P
f＝fG
In the formula: G---wheel load (N);
F---coefficient of rolling friction, relevant with the multiple factors such as character of pavement behavior, travel speed, tire.
Utilize the relation of friction force and friction factor, by measuring wheel required pulling force in the road surfaces rolling process, the coefficient of rolling friction between inverse wheel and the road surface.
Axle under the actual measurement vehicle frame no-load condition carries, or the balancing weight of configuration varying number, finishes the counterweight of frame system and frame.By the actual measurement contact area, calculate the ground connection pressure of tire.Note as the preset parameter of measuring.Then, external equipment external force traction car is linked to each other by the traction link with friction factor car of the present invention, connect dynamometer, check that signal affirmation data transmission is normal, finish the installation and the debugging of each system.Travel with certain speed drawing friction coefficient car, after reaching the required speed of test, remain a constant speed and advance, arrive test segment, turn-on data register (can be placed in the tractor) is gathered the speed of a motor vehicle and pulling force corresponding data, in this process, should note keeping speed steadily and road conditions stable, test segment should be no less than 100 meters accordingly.The mean value of getting all data in the test section is as test result.
Because friction factor is relevant with the speed of a motor vehicle, therefore the present invention is equipped with knotmeter and sensor on testing wheel, signal receiver is installed on ballast box simultaneously, when car moves ahead, wheel, signal receiver links to each other with data recorder, notes the number of turns and the time relation of wheel, can determine the speed of a motor vehicle, thus the relation of the speed of a motor vehicle of determining and pulling force.
The present invention also is equipped with a vehicle frame balance device between tractive force and vertical beam, this device is the plate that the T type is fixed together by two and forms, and can be used for torsion that the balancing a survey car produces in advancing etc.
The present invention also is provided with two bracing frames, is used to support car of the present invention and parks reliable when not working.
The present invention can also adjust vehicular load by the balancing weight of configuration different quality in ballast box, obtains different tire ground connection pressure.In addition, can also dispose temperature, humidity sensor as required, with the warm and humid situation in record test moment highway section.
With respect to prior art, test carriage of the present invention has following advantage and effect:
1. the friction coefficient testing car of the present invention's proposition can be under normal vehicle operation speed, measure the friction factor of road surface, overcome under the low condition of point of fixity in the past, speed with wheel and run at high speed under the condition, the problem that the performance of surface friction coefficient there are differences can also determine the friction co-efficient value under the friction speed simultaneously.
2. the friction factor car of the present invention's proposition can be determined under the different tyre contact pressure conditions friction co-efficient value on road surface by change the counterweight of vehicle in the vehicle frame Weighting system.
Description of drawings
Fig. 1 is of the present invention to be taken the structure master apart and looks synoptic diagram;
Fig. 2 structure schematic side view of the present invention;
Each label lists as follows among the figure:
The 1-ballast box, the 2-knotmeter, the 3-testing wheel, 4-vehicle frame balance device, 5-draws link, 6-vertical beam, 7-vibroshock, 8-bracing frame, 9-hydraulic oil cylinder type dynamometer, 10-axle, 12-signal receiver.
Embodiment
As Fig. 1, shown in Figure 2, pavement friction coefficient testing car, comprise by axle 10 two testing wheels 3 that link together, be positioned at the ballast box 1 of testing wheel 3 tops, with traction link 5, ballast box 1 below is fixedly connected with vertical beam 6, described vertical beam 6 is connected with axle 10 by bearing, one end of described traction link 5 links to each other with external equipment (as the external force traction car), the other end is fixed on the vertical beam 6, also be connected with hydraulic jack dynamometer 9 between described traction link 5 and the vertical beam 6, described hydraulic jack dynamometer 9 is connected (data recorder is placed in the tractor, does not mark among the figure) with data recorder.Axle under the actual measurement vehicle frame no-load condition carries (promptly having only ballast box and vertical beam), by the actual measurement contact area, calculates the ground connection pressure of tire, can calculate the wheel load, notes as the preset parameter of measuring.Then, the external force traction car is linked to each other by traction link 5 with friction factor car of the present invention, connect hydraulic jack dynamometer 9, check that signal affirmation data transmission is normal, finish the installation and the debugging of each system.Travel with certain speed drawing friction coefficient car, after reaching the required speed of test, remain a constant speed and advance, arrive test segment, the turn-on data register is gathered corresponding pulling force data, obtains the friction force under the certain speed, and counter pushing away obtains friction co-efficient value.
On the wheel hub of described testing wheel 3 knotmeter is installed, the outside of described ballast box 1 is equipped with the signal receiver 12 that can receive tachometer signal, the other end of described signal receiver 12 is a free end, nestles up knotmeter, and described signal receiver 12 is connected with data recorder.Data recorder can be noted the relation of speed and pulling force.
Be fixed with vehicle frame balance device 4 on the described vertical beam 6, described vehicle frame balance device 4 is T type structure by a leveling board and a vertical plate and fixedly forms, described traction link 5 has two machinists clamps, leveling board in the described vehicle frame balance device 4 snaps in two machinists clamps, is bolted to connection.Vehicle frame balance device 4 can be used for torsion that the balancing a survey car produces etc. in advancing.One end of hydraulic oil cylinder type dynamometer 9 is fixed on the traction link 5, and the other end is fixed on the vertical panel in the vehicle frame balance device 4, and is fixed on the surface of the leveling board in the vehicle frame balance device.
Described ballast box 1 is provided with balancing weight, can adjust vehicular load by the balancing weight of configuration different quality in ballast box 1, obtains different tire ground connection pressure.Also be fixed with vibroshock 7 on the described axle 10, reduce test carriage road conditions influence in advancing testing.
Also be fixed with bracing frame 8 on the described perpendicular frame 6, be positioned at the front and/or the back of testing wheel 3, it is reliable that car of the present invention is parked when not working.
In addition, the present invention can also dispose temperature, humidity sensor as required, with the warm and humid situation in record test moment highway section.
Claims (8)
1. pavement friction coefficient testing car, comprise two testing wheels, ballast box and traction link, it is characterized in that: described testing wheel links together by axle, described ballast box below is fixedly connected with vertical beam, described vertical beam is connected with axle by bearing, one end of described traction link is fixed on vertical beam, the other end links to each other with external equipment, also be connected with dynamometer between described traction link and the vertical beam, described dynamometer is electrically connected with data recorder, on the wheel hub of described testing wheel knotmeter is installed, the signal receiver that can receive tachometer signal is installed on the described ballast box, described signal receiver is electrically connected with data recorder, be fixed with the vehicle frame balance device on the described vertical beam, described vehicle frame balance device is made up of a leveling board and a vertical plate, and is fixed together in T type mode, and described traction link is fixedlyed connected with the leveling board in the vehicle frame balance device.
2. pavement friction coefficient testing car according to claim 1 is characterized in that: an end of described signal receiver is fixed in the outside of ballast box, and the other end is a free end, nestles up knotmeter.
3. pavement friction coefficient testing car according to claim 1 is characterized in that: described traction link has two machinists clamps, and the leveling board in the described vehicle frame balance device snaps in two machinists clamps, is bolted to connection.
4. pavement friction coefficient testing car according to claim 1, it is characterized in that: an end of described dynamometer is fixed on the traction link, the other end is fixed on the vertical panel in the vehicle frame balance device, and dynamometer is arranged on the surface of leveling board of vehicle frame balance device.
5. pavement friction coefficient testing car according to claim 1 is characterized in that: described dynamometry is counted a hydraulic oil cylinder type dynamometer.
6. pavement friction coefficient testing car according to claim 1 is characterized in that: be provided with balancing weight in the described ballast box.
7. pavement friction coefficient testing car according to claim 1 is characterized in that: also be fixed with vibroshock on the described axle.
8. pavement friction coefficient testing car according to claim 1 is characterized in that: also be fixed with bracing frame on the described vertical beam, be positioned at the front and/or the back of wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910087361 CN101576477B (en) | 2009-06-23 | 2009-06-23 | Pavement friction coefficient testing car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910087361 CN101576477B (en) | 2009-06-23 | 2009-06-23 | Pavement friction coefficient testing car |
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| Publication Number | Publication Date |
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| CN101576477A CN101576477A (en) | 2009-11-11 |
| CN101576477B true CN101576477B (en) | 2011-04-20 |
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| CN 200910087361 Active CN101576477B (en) | 2009-06-23 | 2009-06-23 | Pavement friction coefficient testing car |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445296A (en) * | 2011-11-29 | 2012-05-09 | 江铃汽车股份有限公司 | Detection and counterweight system for braking force of automobile |
| CN102706799B (en) * | 2012-05-21 | 2014-12-03 | 长安大学 | Portable device and method for testing friction coefficient of pavement |
| CN106323869A (en) * | 2016-10-10 | 2017-01-11 | 深圳万发创新进出口贸易有限公司 | Pavement friction coefficient detection system |
| CN107300523B (en) * | 2017-06-27 | 2023-10-31 | 山东交通学院 | Road surface dynamic-static friction coefficient measuring device under indoor and outdoor multi-environment state |
| CN108801902B (en) * | 2018-04-26 | 2021-07-06 | 江铃控股有限公司 | Automobile friction force simulation machine platform |
| CN109164042B (en) * | 2018-10-30 | 2020-12-04 | 温州高伟通工业设计有限公司 | Weight increasing device of aerodrome pavement friction coefficient vehicle |
| CN111024606A (en) * | 2020-02-22 | 2020-04-17 | 李庆锋 | Method for measuring road surface friction condition of travelling crane by means of drag chain |
| CN114594045A (en) * | 2022-03-10 | 2022-06-07 | 重庆交通大学 | Continuous detector for road surface friction performance |
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| CN101576477A (en) | 2009-11-11 |
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