JP2003269948A - Traction property measurement device and measurement method for road surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and portable traction property measurement device for road surface capable of measuring a traction characteristic (variation of a traction coefficient to a slip ratio) on an actual road surface, and capable of measuring, at the same time, a surface roughness curve of the road surface at the same place, and to provide a measurement method capable of measuring the traction characteristic of an arbitrary road surface and the roughness thereof under an arbitrary load (contact surface pressure) and applicable to the evaluation of the road surface and a tire material executed by integrating the surface roughness of the road surface and the traction characteristic together. <P>SOLUTION: This traction property measurement device for road surface is provided with a linear guide part 6 having leg parts 7 supporting the entire device 1; a translational movement mechanism disposed in the lengthwise direction of the guide part 6; a moving part 10 formed on the guide part 6 and linearly moving along the translational movement mechanism; a measurement part 4 fixed to the moving part 10; and a control part for controlling the measurement part 4 to process measurement data. The traction property measurement device is characterized in that the measurement part comprises a unit 2 for measuring the traction of the road surface, and a unit 3 for measuring the roughness of the road surface. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road surface traction property measuring apparatus and method capable of measuring traction characteristics and surface roughness on the same actual road surface.

[0002]

2. Description of the Related Art Various studies have been conducted on road friction in the fields of roads and automobiles. However, changes in the traction coefficient due to the slip ratio (sliding speed / rolling speed) under rolling-sliding contact of tires, Research from the viewpoint of so-called tribology, such as the influence of road surface roughness on it, has been delayed both in Japan and overseas. In recent years, as one of the improvements in the safety of automobiles, the standardization of antilock brake systems (ABS) in vehicles has been rapidly progressing. This AB
In S, the conventional braking system locks the tires to stop the vehicle, but stops the vehicle without locking the tires so that danger can be avoided even in an emergency. In the conventional braking system, the dynamic friction performance when the tire is locked is important.
Has found that dynamic friction performance at low slip rates is important.

However, the current situation is that the relationship between road surface roughness and traction coefficient has not yet been clarified both industrially and academically. Conventionally, as a road friction measuring device, a device that measures the sliding friction coefficient on the actual road surface, a device that measures the traction coefficient between test pieces instead of the actual road surface, and a device that measures the traction between the ice surface and rubber , Etc. have been developed to be mounted on an automobile to measure traction. For example, Japanese Patent Fair 3-1
In the publication No. 0062, "A rubber test piece is attached to a disc
A device for measuring the friction coefficient by rotating the disk while pressing the test piece against the road surface to measure the dynamic friction coefficient between the road surface and the rubber and measuring the sliding friction coefficient on the actual road surface "is disclosed. It is marketed as Nihon Sangyo). In addition, the arm attached with the rubber test piece at the tip is swung down from a high position, the friction coefficient is measured from the damping of the amplitude, and the device that can measure the sliding friction coefficient between the test piece and the ground (portable skid resistance There is a tester). Furthermore, there is a so-called two-cylindrical measuring device that measures the traction coefficient between the rotating drum and the rubber disk, not on the actual road surface.

However, the above conventional friction coefficient measuring device has the following problems. The device (DF tester) that measures the coefficient of sliding friction on the actual road surface is the dynamic friction coefficient under pure sliding contact (locked state of the tire), and the measurement of the friction coefficient is based on ABS. That is, there is a problem that the change in the traction coefficient when the slip ratio is changed in the low slip ratio region cannot be measured. Device that can measure the coefficient of sliding friction between the test piece and the ground (portable skid resistance tester)
Is simple, but like the DF tester, it can only measure the friction coefficient under pure sliding contact, and because the load setting between the road surface and the test piece is uncertain, the measured value is only a reference level. is there. Further, there is a problem that the relative speed to the road surface at the time of measurement is limited to the low speed range. Further, since the device for measuring the dynamic friction coefficient or the traction coefficient between the test pieces does not measure the traction on the actual road surface, it is difficult to directly apply the measurement result to the actual road surface. Therefore, a device that can measure traction on an actual road surface and also a surface roughness of the road surface, or a device that can measure traction characteristics (change of traction coefficient with respect to slip ratio) and surface roughness on the same actual road surface. Has been longed for.

[0005]

An object of the present invention is to measure traction characteristics (change of traction coefficient with respect to slip ratio) on an actual road surface and simultaneously measure a surface roughness curve of the road surface at the same place. A compact and portable road surface traction property measuring device, and it is possible to measure the traction characteristics and road surface roughness of any road surface under any load (contact surface pressure), and combine the road surface roughness and traction characteristics. It is to provide a measurement method applicable to evaluation of road surfaces and tire materials.

[0006]

The present invention provides the following [1].
~ It is specified by the items described in [4]. [1] A linear guide portion having legs supporting the entire apparatus, a translational movement mechanism arranged in the longitudinal direction of the linear guide portion, and a linear movement formed on the linear guide portion along the translational movement mechanism. A moving unit, a measuring unit fixed to the moving unit, and a control unit for controlling the measuring unit and processing the measurement data, the measuring unit measuring the traction of the road surface, and the rough surface of the road surface. A road surface traction property measuring device characterized by comprising a unit for measuring height.

Thus, the change in traction with respect to the slip ratio can be measured on the actual road surface, and the surface roughness curve at the same position on the road surface can be measured at the same time. In addition, by clarifying the relationship between road surface traction and surface roughness, it can be applied to the evaluation of road surface and tire materials that integrate the road surface surface roughness and traction characteristics, and the road surface and tire based on the evaluation. Material design becomes possible and A
It can be applied to the improvement of the brake control method based on the traction characteristics of the road surface in safety devices such as BS.
Further, since it is compact, it can be easily moved to the measurement place and can be installed in a narrow place, and it is excellent in space saving, storability, and transportability. Also,
In addition to evaluation of measurement results by other friction coefficient measurement methods and road surface design, maintenance technology based on road surface traction evaluation can be improved. Furthermore, for automobiles, not only brakes but also cornering force estimation on curved roads and tire design based on it, improvement of steering safety design, automatic gear shifting based on traction grasp during acceleration, continuously variable gear ratio control, etc. It is possible to improve the method.

[2] A unit for measuring traction on a road surface includes a driving means, a shaft portion rotatably formed on the driving means, and a test piece fixed to the shaft portion and in contact with the road surface.
A unit provided with a cantilever arranged to support the drive means and arranged on the moving part, and a displacement measuring part attached to the cantilever, and / or a unit for measuring roughness of a road surface. But,
The traction property measurement device according to [1], further comprising a non-contact displacement meter.

This makes it possible to easily measure the traction characteristics of an arbitrary road surface and the road surface roughness at the same place at the same time, and it can be used in various fields. Also, because of the simple measurement principle using a cantilever, the traction measurement is highly reliable and it is possible to change not only the slip ratio but also the rolling speed itself.

[3] The traction property according to [1] or [2], which is equipped with a load portion which is placed on a unit for measuring the traction and applies a load between the test piece and a road surface. measuring device.

Thus, the load condition can be easily changed by appropriately placing the weight, and the influence of viscoelasticity of the material can be investigated.

[4] The traction property measuring device according to any one of [1] to [3], wherein the test piece is formed in a disk shape and is made of an elastic body.

Thus, the test piece can be accurately and stably translated, and the traction characteristics and the road surface roughness of an arbitrary road surface can be efficiently measured. Further, since the test piece is made of an elastic body and can be formed into a mold and molded, various material conditions can be appropriately changed by using different materials, fillers and the like.

[5] A road surface characterized by including a step of measuring the traction with respect to the slip ratio by controlling the linear movement speed of the measuring section and the rotation speed of the test piece, and a step of measuring the surface roughness curve. Traction property measurement method.

Thus, the change in traction with respect to the slip ratio can be measured on the actual road surface, and the surface roughness curve at the same position on the road surface can be measured at the same time. In addition, by clarifying the relationship between road surface traction and surface roughness, it can be applied to the evaluation of road surface and tire materials that comprehensively evaluate the road surface surface roughness and traction characteristics, and the road surface and tire based on the evaluation. Material design becomes possible and A
It can be applied to the improvement of the brake control method based on the traction characteristics of the road surface in safety devices such as BS.
Further, in addition to evaluation of measurement results by other friction coefficient measuring methods and road surface design, maintenance technology based on road surface traction evaluation can be improved. For automobiles, not only brakes but also cornering force estimation on curved roads and tire design based on it, improvement of steering safety design, automatic gear change based on traction grasp during acceleration, continuously variable gear ratio, etc. It is possible to improve the control method.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a perspective view of a traction property measuring apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a front view of a main part of a unit (TMU) for measuring traction according to Embodiment 1 of the present invention. Is a figure

In FIGS. 1 and 2, reference numeral 1 denotes a road surface traction property measuring device according to the first embodiment of the present invention, and 2
Is a unit (TMU) for measuring traction, 3 is a unit (RMU) for measuring road surface roughness, 4 is a unit (TMU) 2 for measuring traction, and a unit (RMU) 3 for measuring road surface roughness. A measuring unit configured to measure traction characteristics and road surface roughness of an arbitrary road surface, 5 is a road surface to be measured, 6 is a linear guide unit that is installed on the road surface 5 and linearly moves the measuring unit 4, and 7 is a linear guide. Part 6
A leg portion that is erected below the base and that supports the linear guide portion 6,
8 is 2 in the direction perpendicular to the longitudinal direction of the linear guide portion 6.
A frame portion bridged between leg portions 7 of the book, and 9 is a linear guide portion 6
Ball screws 10, which are feed screws, which form a translation mechanism arranged in the longitudinal direction of 10 are screwed into the ball screw 9, and move the measuring unit 4 in a direction parallel to the longitudinal direction of the linear guide unit 6. A moving stage which is a moving part, 11 is a stepping motor which is arranged at one end of the linear guide part 6 and which is a driving means for linearly moving the moving stage 10 along the longitudinal direction of the linear guide part 6, and 12 is a moving stage 1
It is a cantilever that is erected downward on both sides of 0.
A leaf spring made of a plate-shaped phosphor bronze having a thickness of about 3 mm, 13 is an attachment arm that is fixed to the moving stage 10 and supports the leaf spring 12, and 14 is affixed to each of the front surface and the back surface of the leaf spring 12. A strain gauge, which is a displacement measuring unit for measuring the displacement of, measures the traction characteristics and the road surface roughness of the road surface 15 by making contact with the road surface 5. The diameter of the rubber member fixed to the shaft portion (described later) is about 60 mm, A disk-shaped test piece having a width of about 12 mm, and 16 is a drive unit for driving the test piece 15.
A C motor, 17 is a shaft portion rotatably formed on the AC motor 16, and 18 is rotatably supported by an end portion of the shaft portion 17.
An attachment portion of the test piece 15 coaxially attached to the motor, 19 is a motor support for supporting the AC motor 16, 20 is a small linear guide mounted between the motor support 19 and the leaf spring 12, and 20a is a small linear guide. 20 and motor support 19
A support plate 21 mounted between the two is a disc-shaped weight 21 having a notch portion, which is a load portion that is detachably mounted on the motor support base 18 and changes the load during traction measurement.
Reference numeral 2 is a non-contact displacement gauge (CCD laser displacement gauge) forming the RMU 3, and 23 is a moving stage 10 and a non-contact displacement gauge 22.
It is an arm built between them.

Here, the unit (TMU) 2 for measuring traction is mounted on the moving stage 10 by a mounting arm 13.
AC motor 16, a test piece 15 that is fixed to the shaft portion 17 of the AC motor 16 and contacts the road surface to measure traction, and a test piece 15 that is axially supported by the end portion of the shaft portion 17. A mounting portion 18 for supporting the test piece 15, which is formed coaxially, a motor support base 19 for supporting the AC motor 16, and two leaf springs 12 for supporting the AC motor 16 via a small linear guide 20. Composed of. TM
U2 linearly moves along the longitudinal direction of the linear guide portion 6, controls the rotational speed of the test piece 15 and the linear speed of the linear guide portion 6, and measures the traction coefficient for an arbitrary slip ratio.

Unit (RMU) 3 for measuring road surface roughness
A non-contact displacement gauge (CCD laser displacement gauge) 22 is fixed to the moving stage 10 via an arm 23. While moving the moving stage 10 linearly, the distance from the road surface 5 is measured at regular intervals. To obtain a surface roughness curve.

The translational movement mechanism arranged in the linear guide portion 6 is formed by a feed screw arranged in the longitudinal direction of the linear guide portion 6 and screwed into the moving portion, and a rolling linear guide. However, there are other cases, such as a case where it is formed from an engagement groove arranged in a groove shape in the longitudinal direction and an engagement rail slidably engaged with the engagement groove. The feed screw according to the present invention includes, in addition to the ball screw 9, a square screw, a trapezoidal screw, and the like, but is not limited to these, but a ball screw with a small load on the motor and a small friction loss is used. preferable.

The design of the moving distance of the linear guide portion 6 according to the present invention can be appropriately changed depending on the measurement conditions and the like.
At about 500 mm. Examples of the shape of the test piece 15 according to the present invention include a disk shape, a part of a spherical surface, a part of a spheroid, and the like, and the disk shape is preferably used.

Examples of the material of the test piece 15 according to the present invention include natural rubber, synthetic rubber, synthetic resin, metal, ceramics and the like, and a material having viscoelasticity is preferably used.

The synthetic resin used for the test piece 15 is a polyolefin resin (for example, high density polyethylene (HDPE), low density polyethylene (LDPE), ultra high molecular weight polyethylene (UHMWPE), isotactic polypropylene, ethylene propylene). Polymer resin), polyamide resin (for example, nylon 6 (N
6), nylon 66 (N66), nylon 46 (N4
6), nylon 11 (N11), nylon 12 (N1
2), nylon 610 (N610), nylon 612
(N612), nylon 6/66 copolymer (N6 / 6
6), nylon 6/66/610 copolymer (N6 / 66
/ 610), nylon MXD6 (MXD6), nylon 6T, nylon 6 / 6T copolymer, nylon 66 / PP
Copolymer, nylon 66 / PPS copolymer, polyester resin (for example, polybutylene terephthalate (P
BT), polyethylene terephthalate (PET), polyethylene isophthalate (PEI), polyester copolymer, PET / PEI copolymer, polyarylate (PA)
R), polybutylene naphthalate (PBN), liquid crystal polyester, aromatic polyester such as polyoxyalkylene diimidic acid / polybutyrate terephthalate copolymer), polyether resin (for example, polyacetal (POM), polyphenylene oxide (PPO) ), Polysulfone (PSF), polyetheretherketone (PEEK)), polynitrile resin (for example, polyacrylonitrile (PAN), polymethacrylonitrile,
Acrylonitrile / styrene copolymer (AS), methacrylonitrile / styrene copolymer, methacrylonitrile / styrene / butadiene copolymer), polymethacrylate resin (for example, polymethylmethacrylate (PMM)
A), polyethylmethacrylate), polyvinyl resins (for example, vinyl acetate (EVA), polyvinyl alcohol (PVA), vinyl alcohol / ethylene copolymer (EVOH), polyvinylidene chloride (PVDC), polyvinyl chloride (PVC) ), Vinyl chloride / vinylidene chloride copolymer, vinylidene chloride / methyl acrylate copolymer), cellulose resin (eg, cellulose acetate, cellulose acetate butyrate), fluorine resin (eg, polyvinylidene fluoride (PVDF), polyfluoride) Vinyl (PV
F), polychlorofluoroethylene (PCTFE), tetrafluoroethylene / ethylene copolymer (ETF
E)), imide-based resin (for example, aromatic polyimide (P
I)), polyacetal and the like can be mentioned.

The rubber used for the test piece 15 is usually used mainly in tire treads, but specifically, it is a diene rubber and its hydrogenated product (for example, natural rubber, polyisoprene rubber, epoxidized natural rubber). , Styrene-butadiene copolymer rubber, polybutadiene rubber (high cis BR and low cis BR), NBR, hydrogenated NBR, hydrogenated SB
R), various elastomers such as olefin rubber (eg ethylene propylene rubber (EPDM, EP
M)), maleic acid-modified ethylene propylene rubber (M-
EPM), IIR, isobutylene and aromatic vinyl or diene monomer copolymer, halogen-containing rubber (for example,
Brominated butyl rubber, chlorinated butyl rubber, bromide of isobutylene paramethylstyrene copolymer (Br-IPM
S), chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CM), maleic acid-modified chlorinated polyethylene (M-CM)), thermoplastic elastomer (for example, styrene elastomer, olefin elastomer, ester elastomer), etc. Is mentioned.

The test piece 15 of the present invention is a process oil, a vulcanizing agent, a vulcanization accelerator, a vulcanization activator, a stabilizer, an ultraviolet absorber, a lubricant, and the like, as long as the object of the present invention is not impaired.
You may blend additives, such as a bluing agent, a pigment, a coloring agent, an antioxidant, and an antistatic agent.

AC motor 1 as a drive unit according to the present invention
The small linear guide 20 can freely move 6 in the vertical direction with respect to the leaf spring 12. As the drive unit, in addition to the AC motor 16 in the present embodiment, D
A C motor, an AC servo motor, etc. can also be used. Measuring unit 4
The control unit (not shown) that controls the linear movement speed and the rotation speed of the test piece 15 and processes the measurement data includes a notebook personal computer, an input / output card attached to the personal computer, an interface circuit, amplifiers, a motor driver, It consists of hardware such as a storage battery and software for control measurement, and can be moved by being stored in a rack or the like.

The stepping motor 11 for driving the linear guide section 6 and the AC motor 16 of the TMU 2 are both controlled by the notebook personal computer and the driver circuit.
On the other hand, the displacement data from the CCD laser displacement meter 22 is
It is taken into the personal computer via the AD conversion card. Further, the strain data of the leaf spring 12 is output as a voltage from a strain amplifier (strain amplifier).

It is possible to provide a moving portion such as a caster with a lock function at the end portion below the leg portion 7 in order to move the entire linear guide device 1 to an arbitrary place.

In the present embodiment, the traction (tangential force) acting between the road surface 5 and the test piece 15 is the leaf spring 12.
The bending strain is measured by detecting the bending strain, but any measuring method may be used. As a method of measuring the traction, for example, a torque meter is attached between the shaft portion 17 of the AC motor 16 and the test piece 15 to measure the torque, and the portion from the AC motor 16 to the test piece 15 is placed on a predetermined guide. Examples include a method in which the roller coil is supported and a compression coil spring or a load cell is pushed or pulled in the direction of the tangential force to measure the force.

As a method of measuring elastic strain (elastic stress) or bending strain (bending stress), a laser using light such as a laser is used both when using a leaf spring which is a cantilever and when using a guide. A displacement meter or the like can be used. Specifically, the laser light emitted from the light emitting element is reflected on the road surface, a part of the reflected light is received by the light receiving element, and the distance to the leaf spring is obtained by the light receiving position.

Other means for measuring the displacement or stress on the surface of the leaf spring 12 include, but are not limited to, a method using an electric capacitance (gap sensor).

In the present invention, since the moving stage 10 of the linear guide section 6 is translated in the longitudinal direction of the linear guide section 6, the rotary movement of the stepping motor 11 having the ball screw 9 arranged in the linear guide section 6 is performed. It is converted to linear motion.

Since a constant load is applied between the test piece 15 and the road surface 5, if a further load is required, the load for traction measurement can be applied according to the measurement conditions. Examples of means for changing the load include, but are not limited to, a method using a weight (dead load) 21 or a spring, a method using hydraulic pressure, air pressure, and the like. A DC battery (1) is used as a power source for all the electric devices of the apparatus, that is, the stepping motor 11, the AC motor 16, the distortion amplifier, the laser displacement meter, and the personal computer.
2V) is used, but it is not limited to this as long as it is a portable power source.

In the present invention, the road surface to be measured is
In addition to roads, airfield runways, other outdoor corridors, replica road surfaces formed indoors in the form of plates, indoor floors, etc. can be measured at any location and are highly versatile.

The operation of the road surface traction property measuring apparatus 1 configured as described above will be described below. (1) Measurement of traction coefficient While moving both TMU2 and RMU3 for measuring the friction coefficient of the road surface linearly along the longitudinal direction of the linear guide portion 6, the test piece 1 axially supported by the shaft portion 17 of the AC motor 16
The traction is obtained by rotating 5 and applying a predetermined slip ratio between the test piece 15 and the road surface 5 to measure the strain of the leaf spring 12. The traction coefficient is obtained by dividing this by the applied load.

The linear movement speed of the measuring unit 4 and the AC motor 16
By changing the rotation speed of, it is possible to obtain changes in the traction coefficient for various slip rates.
The slip ratio S is given by the following equation (1) (Equation 1).

[0037]

## EQU1 ## S = 2 × (V2-V1) / (V2 + V1) (In the formula, V1 represents the linear moving speed of the measuring portion, and V2 represents the rotational speed (peripheral speed) of the test piece).

Stepping motor 11 and AC motor 16
Is controlled by a laptop computer,
It is possible to specify operating conditions such as rotation direction and rotation angle. A total of four strain gauges 14 are attached to each of the front and back sides of the leaf spring 12 that supports the AC motor 16 from both sides. By constructing a Wheatstone bridge circuit with the four strain gauges 14, the bending strain of the leaf spring 12 is measured. Then, the analog voltage value sent from the strain amplifier is added to the AD built into the notebook computer.
AD conversion is performed using a conversion card to calculate the traction coefficient μ. In the measurement, for example, with V1 being a constant value, various V2 are given to obtain the traction coefficient μ, and the change of μ with respect to S is obtained from these.

As an example of the measurement results, two road surfaces, road surface A
The result on the road surface B is shown in FIG. All measurement conditions were normal temperature and dry condition, load 31.4N, translation speed V1.
= 20 mm / s. The material of the test piece 15 used was SBR (styrene-butadiene rubber), and
S A hardness (JIS K 6253) is 69 (@ 20)
℃), tensile elastic modulus M100 (JIS K 6251 1
00% modulus) is 2.9 MPa, loss coefficient tan δ
Is 0.389 (@ 20 ° C). From zero slip rate to 0.
The traction coefficient increases linearly up to about 2, and when the slip ratio is 0.2 or more, the increase ratio decreases and reaches the maximum value. On the road surface A and the road surface B, μ has almost the same value at a low slip rate, but the maximum value and S reaching the maximum value are both larger on the road surface B.

(2) Measurement of Road Surface Roughness Curve While moving the measuring unit 4 linearly along the longitudinal direction of the linear guide unit 6 in the same manner as above, the distance from the road surface is measured by the RMU 3 at regular intervals. That is, the analog voltage output from the CCD laser displacement sensor is AD-converted at fixed time intervals to obtain road surface roughness curve data.

Here, from the relationship between the output of the CCD laser displacement sensor and the input voltage range of the AD conversion card incorporated in the PC, the measurement range in the height direction of the road surface roughness curve is about 1.
It is 0 mm. The results of the road surface roughness measured by the CCD laser displacement sensor are shown in FIGS. 4 and 5.

From FIGS. 4 and 5, on the road surface A, irregularities of approximately the same height are randomly present, whereas on the road surface B, there are locally large recesses,
It can be seen that the overall roughness is large. This is probably because the asphalt was worn and the gravel remained.

As described above, since the road surface traction property measuring apparatus 1 of the present embodiment is constructed and operates, it has the following effects. 1) The traction against the slip ratio can be measured on the actual road surface, and the surface roughness curve at the same position on the road surface can be measured at the same time. The traction coefficient is obtained by dividing the traction by the load. 2) By clarifying the relationship between road surface traction and surface roughness, it can be applied to the evaluation of road surface and tire materials that integrate the road surface roughness and traction characteristics, and the road surface and tire based on the evaluation. The material can be designed, and it can be applied to the improvement of the brake control method based on the traction characteristics of the road surface in the safety device such as ABS. 3) Since it is compact, it can be easily moved to the measurement location, and it can be installed in a narrow place, and is excellent in space saving, storability, and transportability. 4) In addition to evaluation of measurement results by other friction coefficient measuring methods and road surface design, maintenance technology based on road surface traction evaluation can be improved. 5) For automobiles, not only brakes but also cornering force estimation on curved roads and tire design based on it, improvement of steering safety design, automatic gear shifting based on traction grasp during acceleration, stepless gear ratio control, etc. It is possible to improve the method.

6) It is possible to easily measure the traction characteristics of an arbitrary road surface and the road surface roughness at the same place at the same time.
It can be used in various fields. 7) Due to the simple measurement principle using the cantilever 12,
Not only is the reliability of traction measurement excellent, but it is possible to change not only the slip ratio but also the rolling speed itself. 8) By appropriately mounting the weight 21, the load condition can be easily changed and the influence of viscoelasticity of the material can be investigated. 9) Since the test piece 15 is formed in the shape of a disk and is made of an elastic body, the test piece 15 can be accurately and stably translated, and the traction characteristics and the road surface roughness of an arbitrary road surface can be measured efficiently. be able to. 10) Since the test piece 15 is made of an elastic body and can be formed into a mold and molded, various material conditions can be appropriately changed by using different materials, fillers and the like.

11) Since the bending strain of the leaf spring 12 is measured by a strain gauge, the traction coefficient and the road surface roughness can be measured very easily. 12) Unit for measuring traction coefficient (TM
U) 2 has an AC motor 16, a test piece 15 and a leaf spring 12, and is fixed to the moving stage 10, so that it linearly moves along the longitudinal direction of the linear guide portion 6 and the rotational speed of the test piece 15 By controlling the linear velocity of the linear guide section 6, the traction coefficient for an arbitrary slip ratio can be efficiently measured. 13) Since the unit (RMU) 3 for measuring the road surface roughness is composed of a non-contact displacement gauge (CCD laser displacement gauge) 22 and is fixed to the moving stage 10 via an arm 23, the linear guide portion 6 and the translational movement. However, the surface roughness curve is obtained by measuring the distance from the road surface 5 at regular intervals. 14) In order to move the whole device 1 to any place, the leg 7
If a moving means such as a caster with a lock function is provided at the lower end, the device can be fixed at a predetermined place and the levelness of the device can be adjusted. 15) Control of the device and data acquisition can be performed by a laptop computer, so it is easy to carry, and the traction coefficient and road surface roughness can be easily measured, which is excellent in measurement workability and convenience. .

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the embodiments, and various design changes can be made without departing from the scope of the present invention. .

[0047]

According to the road surface traction property measuring device of the present invention, it is possible to measure the traction characteristics (change of the traction coefficient with respect to the slip ratio) on an actual road surface, and also the surface roughness curve of the road surface at the same place. Can be measured. In addition, by clarifying the relationship between road surface traction and surface roughness, it can be applied to the evaluation of road surface and tire materials that integrate the road surface surface roughness and traction characteristics, and the road surface and tire based on the evaluation. The material can be designed, and it can be applied to the improvement of the brake control method based on the traction characteristics of the road surface in the safety device such as ABS.

According to the road surface traction property measuring method of the present invention, the traction coefficient for an arbitrary slip ratio is measured by controlling the rotational speed of the test piece and the translational speed of the linear guide, and at the same time, the non-contact movement in translational motion is performed. The surface roughness curve can be measured by a displacement meter.

[Brief description of drawings]

FIG. 1 is a perspective view of a traction property measuring device according to a first embodiment of the present invention.

FIG. 2 is a front view of a unit (TMU) for measuring traction according to the first embodiment of the present invention.

FIG. 3 is a graph showing a measurement result of a traction coefficient.

FIG. 4 Roughness curve of road surface A

FIG. 5: Roughness curve of road surface B

[Explanation of symbols]

1 Road surface traction property measurement device Unit for measuring traction (TMU) 3 Road surface roughness measurement unit (RMU) 4 measuring section 5 road surface 6 Linear guide section 7 legs 8 frame parts 9 ball screw 10 moving stages 11 Driving means (stepping motor) 12 Cantilever (leaf spring) 13 mounting arm 14 Displacement measurement site (strain gauge) 15 test pieces 16 Drive unit (AC motor) 17 Shaft 18 Attachment 19 Motor support base 20 Small linear guide 20a support plate 21 weight 22 Non-contact displacement meter (CCD laser displacement meter) 23 arms

Claims (5)

[Claims] 1. A linear guide portion having a leg portion for supporting the entire apparatus, a translational movement mechanism arranged in a longitudinal direction of the linear guide portion, and a translational movement mechanism formed on the linear guide portion along the translational movement mechanism. A moving unit that moves linearly, a measuring unit fixed to the moving unit, and a control unit that controls the measuring unit and processes measurement data, the measuring unit measuring a traction of a road surface, and a road surface A traction property measuring device for a road surface, which comprises a unit for measuring the roughness of the road surface. 2. A unit for measuring traction on a road surface includes a drive unit, a shaft unit rotatably formed on the drive unit, a test piece fixed to the shaft unit and in contact with the road surface, and a moving unit. A cantilever formed to support the drive unit and a displacement measuring unit attached to the cantilever;
The traction property measuring apparatus according to claim 1, wherein the unit for measuring the roughness of the road surface and / or the road surface comprises a non-contact displacement meter. 3. The traction property measuring apparatus according to claim 1, further comprising a load portion mounted on the unit for measuring the traction and applying a load between the test piece and a road surface. 4. The traction property measuring device according to claim 1, wherein the test piece is formed in a disk shape and is made of an elastic body. 5. A road surface traction, comprising: a step of controlling a linear moving speed of a measuring section and a rotating speed of a test piece to measure a traction with respect to a slip ratio; and a step of measuring a surface roughness curve. Property measurement method.