JP2002082033A - Load movement testing apparatus and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a load movement testing apparatus and method serving to make evaluations of high reliability by reproducing a situation of damage occurrence, corresponding to a variety of conditions and assuring high closeness and accuracy. SOLUTION: The method includes rotating a sample 2 following the rotation of a test wheel 51; combining the motions of both to set, for example, the speed of the test wheel 51 relative to the sample 2 over a wide range; causing angular displacement of the test wheel 51 on a horizontal plane in travel direction L as following the rotation of the test wheel 51; and causing traversing of both at the same time so as to control the test wheel 51 to move along a transverse direction, to thereby faithfully reproduce a situation of occurrence of deformation, wear or the like at, for example, the curve of a road.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load transfer test apparatus and a load transfer test method, and more particularly to a load transfer test apparatus for promoting abrasion of an asphalt mixture used in asphalt coating and performing a quality test of the asphalt mixture. And a load transfer test method.

[0002]

2. Description of the Related Art Conventionally, as a load transfer test apparatus for performing a quality test of an asphalt mixture used in asphalt coating, for example, by evaluating the consolidation and the resistance of an asphalt mixture to flow, for example, asphalt on an expressway, etc. There is a wheel tracking tester for predicting and evaluating the rutting phenomenon or the like occurring on a painted surface.

As shown in FIG. 27, a wheel tracking tester 101 has test wheels 103 which perform a horizontal reciprocating motion on a test piece 102.

When the test wheel 103 reciprocates on the specimen 102 a predetermined number of times, the surface of the specimen 102 is deformed. This reciprocating motion is performed under predetermined conditions where the temperature and the like are constant, and the above-described deformation state is measured.
2 is evaluated.

[0005] Recently, for the purpose of ensuring safety and groundwater recharge, permeable pavements and drainage pavements that allow rainwater to pass through voids in pavements using a porous material have emerged. In this regard, there is an increasing demand to evaluate the state of breakage such as deformation and wear.

Further, for example, a situation where the vehicle is traveling on a curved part of a paved road, a situation where a slip occurs while traveling on a curved part, and a situation where a brake is applied while traveling on a curved part, etc. There is an increasing demand to faithfully reproduce various situations and evaluate the situation of breakage such as deformation and wear.

[0007]

However, various situations such as a method for evaluating a permeable pavement and a drainage pavement, and a situation when traveling on a curved part of a pavement road are faithfully reproduced, and the deformation and the like are reduced. At present it is not established to evaluate the state of breakage such as abrasion.Tests using the above wheel tracking tester also relate to highly watertight materials, and permeable pavement and drainage pavement are targeted. Not in.

In the conventional wheel tracking tester as described above, the test specimen is worn and deformed by simply reciprocating the test wheel on the test specimen, and the evaluation is performed. Under various assumed conditions, it has been impossible to accurately and accurately reproduce the state of occurrence of deformation, wear, and the like, and to perform highly reliable evaluation.

Therefore, it is difficult for the conventional testing machine to accurately and accurately reproduce the state of occurrence of breakage such as deformation or wear under various assumed conditions, so that a highly reliable evaluation is required. Can't do it.

The present invention has been made in view of the above circumstances, and an object of the present invention is to accurately reproduce the state of occurrence of breakage with high fidelity corresponding to various conditions, and to achieve high reliability. An object of the present invention is to provide a load transfer test device and a load transfer test method that can be used for performing an evaluation.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, a test wheel is moved by a traveling loading means, and a load by the test wheel is applied to a specimen on a pavement road surface. A load transfer test device for performing a quality test of the specimen by giving the wheel rotation driving means for rotationally driving the test wheel, and the specimen rotation driving means for rotationally driving the specimen. It is characterized by.

[0012] The invention according to claim 2 further comprises a specimen traversing means for moving the specimen along a direction intersecting a running direction of the test wheel on a horizontal plane. And

Further, the invention according to claim 3 is characterized in that it further comprises angular displacement means for angularly displacing the test wheel on a horizontal plane with respect to the traveling direction.

Further, the invention according to claim 4 is characterized by further comprising a support means for supporting the test wheel so as to allow the angular displacement.

Further, the invention according to claim 5 is characterized in that it further comprises a wheel elevating means for vertically moving the test wheel.

Further, the invention according to claim 6 is characterized in that it further comprises a wheel traverse means for moving the test wheel along a direction intersecting a running direction on a horizontal plane.

Further, the invention according to claim 7 is characterized by further comprising a specimen moving means capable of moving the specimen along a running direction.

[0018] The invention described in claim 8 is a movement in which an arbitrary point on the peripheral surface of the rotating test wheel contacts with the specimen and moves along the traveling direction of the specimen. The wheel drive rotating means and the specimen moving means are interlockingly controlled so that the speed maintains a predetermined ratio.

According to a ninth aspect of the present invention, the wheel rotation driving means includes a motor for driving the test wheel to rotate, and the torque of the motor is controlled so as to maintain a predetermined constant value. It is characterized by:

According to a tenth aspect of the present invention, the specimen rotating drive means includes a gear groove formed in a substantially circular shape about a rotation center axis which supports and rotates the specimen. It is characterized in that it includes a sample receiving base, a gear that meshes with the gear groove, and a drive motor that rotationally drives the gear.

According to an eleventh aspect of the present invention, the specimen rotating drive means comprises: a rotary table for supporting and rotating the specimen; and a rotary table provided around the rotary table for rotating the rotary table. And a wheel connected to the rotary table and moving along the guide wall.

Further, according to a twelfth aspect of the present invention, the test wheel is displaced by a predetermined angle by the angular displacement means, and the test sample is rotated while maintaining the predetermined angle. The traverse means is controlled to move the test wheel along the lateral direction.

According to a thirteenth aspect of the present invention, the angular displacement means includes a first connecting member provided on a support for rotatably supporting the test wheel, and a first connecting member provided on the first connecting member. And a second connecting member connected so as to be angularly displaceable.

According to a fourteenth aspect of the present invention, there is provided a load transfer test method for applying a moving load to a specimen on a pavement road surface and performing a quality test on the specimen, wherein the moving load is applied to the specimen. A specimen rotating step of rotating the specimen in a substantially horizontal plane with respect to the traveling direction of the test wheel to be added; and a test wheel slide for rotating the test wheel while rotating the specimen to make sliding contact with the specimen. And a contacting step.

The invention according to claim 15 is characterized by further comprising a rotation speed setting step of setting the rotation speed of the test wheel and the rotation speed of the specimen to be substantially the same.

The invention according to claim 16 further comprises a traversing step of moving the test wheel relative to the specimen along a direction intersecting the running direction of the test wheel on a horizontal plane. It is characterized by having.

[0027] To achieve the above object, the invention according to claim 17 is a load transfer test apparatus for applying a load by a test wheel to a specimen to perform a quality test of the specimen. The test device is configured by a wheel rotation driving means for rotating the test wheel, and a mounting body on which the test object is mounted, wherein the mounting body has a test object elevating means for vertically moving the test object.

The invention according to claim 18 is the first invention.
7. The load transfer test device according to 7, wherein the placing object further includes a test object moving means for moving the test object along a running direction of the test wheel.

[0029] The invention of claim 19 provides the invention according to claim 1.
8. The load transfer test device according to 7, further comprising angular displacement means for angularly displacing the test wheel on a horizontal plane with respect to a traveling direction.

The invention according to claim 20 is the first invention.
7. The load transfer test device according to 7, wherein the test wheels are:
It is characterized by further comprising a wheel traverse means for moving along a direction intersecting on a horizontal plane with the traveling direction.

Further, the invention described in claim 21 is the same as that in claim 1
8. The load transfer test device according to 7, further comprising a wheel elevating means for moving the test wheel up and down.

[0032] The invention according to claim 22 is based on claim 1.
7. The load transfer test device according to 7, wherein the speed at which an arbitrary point on the peripheral surface of the rotating test wheel is in contact with the test object and the moving speed at which the test object moves along the traveling direction are different. The wheel drive rotating means and the specimen moving means are interlocked so as to maintain a predetermined ratio.

The invention according to claim 23 is the first invention.
7. The load transfer test device according to 7, wherein a speed at which the test wheel is moved along a direction intersecting a running direction on a horizontal plane and a speed at which the test specimen is moved along the running direction are predetermined. The wheel traversing means and the specimen moving means are interlocked so as to maintain the ratio.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of a preferred embodiment of the present invention will be specifically described with reference to the drawings.

First Embodiment (Schematic Description) First, the overall schematic structure of a load transfer test device, which is an accelerated wear durability test device of the present invention, will be described with reference to FIG. 1 and FIG. FIG. 1 is a front view showing the configuration of the load transfer test device of the present example. 2A and 2B are explanatory diagrams showing a schematic configuration in which a test specimen and a test wheel portion of the load transfer test device are extracted, wherein FIG. 2A is a plan view and FIG. 2B is a side view.

As shown in FIG. 1, the load transfer test apparatus 1 of this embodiment is an apparatus for applying a moving load to a specimen 2 on a pavement road surface to perform a quality test on the specimen 2. A load is applied by a traveling loading device including a test wheel 51 that applies a moving load and a traveling loading device 5 that is a traveling loading mechanism.

The load transfer test apparatus 1 is shown in FIG.
As shown in FIG. 5, a wheel drive unit 52 serving as a wheel rotation drive unit for rotating and driving the test wheel 51 in the θ2 direction;
The specimen rotation drive mechanism 66, which is a specimen rotation drive means for rotating the specimen in the θ2 direction, intersects the specimen 2 on the horizontal plane with the running direction of the test wheel 2 (the L direction in FIG. 2A). The specimen horizontal drive mechanism 67 which is a specimen traversing means that is moved along the direction of movement (T direction in FIG. 2A).
And is configured.

The wheel drive unit 52 includes a wheel rotation drive motor 521 as a drive source, a pair of pulleys 523 and 524 as power transmission members for transmitting the rotation power of the wheel rotation drive motor 521, and a belt suspended therefrom. 522
And a test wheel 5 connected to the rotation shaft 525 of the pulley 524 and rotating according to the rotation of the wheel rotation drive motor 521.
And 1. For details of this configuration,
It will be described later together with the description of FIG.

The specimen rotation drive mechanism 66 includes a specimen rotation drive motor 660 as a drive source, a pair of pulleys 662 and 663 as power transmission members for transmitting the rotational power of the specimen rotation drive motor 660, and The suspended belt 664 is connected to the rotating shaft of the pulley 663 to reduce the rotational speed of the specimen rotating drive motor 660 at a predetermined reduction ratio, and to transmit the reduced rotational power to the specimen 2 to rotate the specimen 2. And a speed reducer 661 which is a rotation speed control means for controlling the speed.

The specimen horizontal drive mechanism 67 includes a specimen horizontal drive motor 670 as a drive source, a pair of pulleys 671 and 672 as power transmission members for transmitting the rotational power of the specimen horizontal drive motor 670, and A screw 6 which is a power conversion member that is connected to the suspended belt 673 and the rotation shaft of the pulley 672 and converts the rotational power of the specimen horizontal drive motor 670 into a linear movement power in the T direction.
74.

Thus, the test wheel 51 is rotated in the θ2 direction while the specimen 2 is rotated in the θ1 direction, and the test wheel 51 is slid in contact with the specimen 2, whereby the test wheel 5 is rotated.
One test can be performed. It is preferable that the rotation speed of the test wheel 51 and the rotation speed of the specimen 2 are set to be substantially the same in advance.

Further, while performing the above-described rotation operations,
By moving the test wheel 51 relative to the test object 2 along the T direction by the test object horizontal drive mechanism 67, a traverse test can also be performed. Hereinafter, a specific configuration will be described in detail.

(Specific Overall Configuration) Next, the specific configuration of the load transfer test apparatus 1 of this embodiment will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 3 is a side view showing a schematic configuration of the load transfer test device. FIG. 4 is a plan view showing the configuration of the load transfer test device. FIG. 5 is a side view showing a test wheel and a wheel drive unit constituting the load transfer test device. FIG. 6 is a front view showing the test wheel and the wheel drive unit.
Is a cross-sectional view taken along the line BB in FIG. 6, FIG. 8 is an exploded perspective view schematically showing a configuration of a wheel angle adjustment unit, and FIG. 9 is a block diagram showing an electrical configuration of the load transfer test device. , FIG.
Is an explanatory diagram for illustrating a method of angular displacement in the wheel angle adjusting unit, FIG. 11 is an explanatory diagram for explaining the operation of the accelerated wear test device, and FIG. FIG. 4 is an explanatory diagram for explaining a method in the case of causing the user to make a request.

FIGS. 1 and 3 show the load transfer test apparatus 1 of this embodiment.
As shown in FIG. 4 and FIG. 4, a test apparatus used for performing a quality test of a specimen 2 made of an asphalt mixture is assembled using, for example, a channel steel, an angle iron, a steel plate, and the like, and various mechanisms described below. A frame-like structure 3 for mounting and supporting the test piece, a mounting body 4 on which the test piece 2 and various mechanisms for driving the test piece 2 are mounted, and a moving load for applying a moving load to the test piece 2 from above. Travel loading device (travel loading mechanism) 5
A mounting body moving mechanism 6 which is a test body moving means for moving the test body 2 by horizontally reciprocating the mounting body 4, and a water immersion apparatus for housing the test body 2 in a state of being immersed in water 7 and an operation control unit 8 that operates the load transfer test device 1 and controls each component.

Specimen 2 is an asphalt mixture put in a box-shaped form 9 made of metal, and is 30 cm square or 50 cm square.
It has dimensions of cm square and a thickness of about 5 cm.

The traveling loading device 5 includes a test wheel 51 that horizontally reciprocates on the specimen 2, a wheel driving unit (wheel driving unit) 52 that rotationally drives the test wheel 51, and a test wheel 51 and a wheel driving unit 52. Two directions perpendicular to each other on a horizontal plane, which are suspended from the ceiling portion 31 of the frame-shaped structure 3, that is, a running direction (left-right direction shown in FIGS. 1 and 4) L and a lateral direction perpendicular to the running direction (up and down shown in FIG. 4) Traveling support 53 that supports the frame-like structure 3 so as to be able to reciprocate along the direction T).
And a wheel angle adjusting unit 54 that is an angular displacement unit that holds the test wheel 51 in a horizontal plane with respect to the traveling direction L, for example, clockwise or counterclockwise by an angle of up to 30 °.
And a traverse mechanism 5 which is a wheel traversing means for moving the traveling support 53, that is, the test wheel 51 in the lateral direction T.
5 is provided.

The test wheel 51 has an outer diameter of 2
A solid tire having 0 cm, a width of 5 cm, a rubber thickness of 1.5 cm, and a rubber hardness of 80 ± 3 at 20 ° C. and 78 ± 2 at 60 ° C. is used.

As shown in FIGS. 1 to 6, the wheel drive unit 5
Reference numeral 2 denotes a wheel rotation drive motor (electric motor) 521 that rotates forward and reverse under the control of the operation control unit 8, and a belt 52 that transmits the rotation of the wheel rotation drive motor 521 to the test wheels 51.
Two.

The traveling support 53 is provided with guide rails 555, 5
A movable base 531 on both sides of which are reciprocally movable in the lateral direction T on the base 55, and a reciprocating movable along the running direction L on guide rails 531a and 531a of the movable base 531. Moving mount 532 and moving mount 5
32, a mounting shaft 533 vertically attached to the center of the vehicle 32 and a lower end to which the test wheel 51 and the wheel drive unit 52 are attached, and a wheel elevating means including a drive motor 534a for vertically moving the test wheel 51 along the vertical direction. It has a certain wheel elevating mechanism 534 and a load adjusting mechanism 535 for adjusting the load on the specimen 2 by a screw jack. The reference position can be adjusted by the above-described wheel elevating mechanism 53 in accordance with the size of various test pieces 2 and the size of the test wheel 51.

Here, the reciprocating speed of the test wheel 51 by the drive motor 521 (wheel self-running speed) is up to 300 mm.
/ S.

The load adjusting mechanism 535 has a load of 7 in the standard wheel tracking test.
It is adjusted so that a load in the range of ± 20 kg is applied to 0 kg.

As shown in FIGS. 5 to 8, the wheel angle adjusting unit (angular displacement means, angular displacement mechanism) 54 includes a mounting member 5.
A fixed mounting plate member 541 which is fixed to the lower end of the mounting shaft 533 via the holes 45 and 546 and has a bolt insertion hole 541a of a predetermined diameter formed in the center, and a mounting plate member 542 which is fixed to the test wheel 51 side; A mounting member 543 fixed to the drive motor 521 side connected to the mounting plate member 542 using a bolt inserted through the bolt insertion hole 541a;
And a mounting member 544 that supports the mounting plate member 542 and is fixed to the fixed mounting member 541.

At both ends of the mounting plate member 542, mounting holes 542b and 542c for doubly fixing the mounting member 544 concentrically with respect to the rotation axis are provided at positions corresponding to the wheel angles. .

The mounting holes 542b and 542c are arranged at an angular interval of 5 ° with respect to the rotation axis, and rotate the test wheel 51 and the wheel driving unit 52 clockwise and counterclockwise on the horizontal plane with respect to the running direction L. It is designed to be angularly displaced by 5 ° up to a maximum of 30 °.

Mounting holes 542 corresponding to predetermined wheel angles
b or mounting hole 542c and mounting hole 5 of mounting member 544
44a, and the bolt is inserted to fix the mounting plate member 542. Further, the mounting plate member 542 and the mounting member 543 are aligned with the mounting hole 542a and the mounting hole 543a, and the bolt insertion hole 541a is formed. The test wheel 51 and the wheel drive unit 52 are fixed at a predetermined wheel angle by inserting and fixing the bolts inside.

The mounting member 544 has a through hole 544b.
A bolt is inserted from below, and the bolt is screwed into a female screw portion (not shown) provided on the fixed mounting member 541 to be fixed to the fixed mounting plate member 541.

The traverse mechanism 55 is arranged along the lateral direction T on the ceiling 31 with the wheel traverse drive motor 551 rotating forward and backward, and the rotational movement of the wheel traverse drive motor 551 is transmitted via the chain 552 to rotate. It has a screw screw 553 in which a male screw is screwed, and a nut portion 554 for screwing the screw screw 553 fixed to the moving base 531.

Here, the wheel traverse drive motor 551
The reciprocating speed (wheel traverse speed) of the test wheel 51 along the lateral direction T is 30 to 100 mm / s. As described above, this traverse may be performed by the wheel traverse drive motor 551, may be performed by the specimen horizontal drive motor 670 (see FIGS. 1 and 2), or may be performed by using both. .

The mounting body moving mechanism 6 is provided with a mounting body driving motor 61 that rotates forward and backward, and a mounting body driving motor 61 that is disposed along the running direction L on the floor portion 32 and that is connected via a belt 62.
Is mounted on a guide screw 65 which is rotated along the running direction L and is reciprocally movable along the running direction L on a guide rail 65 arranged along the running direction L on the floor 32. And a nut portion 64 that is fixed to the mounted mounting body 4 and is screwed with the screw screw.

Here, the reciprocating speed (test object speed) of the mount 4, that is, the test object 2, in the running direction L by the mount driving motor 61 is 300 mm / s at the maximum.

The water immersion device 7 includes a water tank 71 formed around the specimen 2, a circulation pump 72 for circulating the water in the water tank 71, and a capacity for heating the water in the water tank 71 to a predetermined water temperature. Has a heater 73 of, for example, 3 kW (see FIG. 9).

The operation control section 8 has a control panel 8A and a relay panel (not shown) attached to the frame-like structure 3 side.
On the panel surface of the control panel 8A, each mechanism is started or stopped, the wheel self-running speed, the wheel traverse speed (wheel operation,
Specimen operation, both-side operation), specimen speed, specimen rotation speed, ratio of rotation speed of wheel rotation drive motor 521 to rotation speed of specimen rotation drive motor 660 (first interlocking ratio), The ratio of the rotation speed of the wheel rotation drive motor 521 to the rotation speed of the mounting body drive motor 61 (second
Operation setting section 8 for setting the number of tests (number of reciprocations), the torque of the wheel rotation drive motor 521, and the like.
1 and a display unit 82 composed of instruments for indicating each speed and the current value of the drive motor 521 are provided.

Here, the first and second interlocking ratios can be set from 100% to 30% of the synchronous state.

Further, as shown in FIG. 3, the load transfer test device 1 of the present embodiment has a wheel support mechanism 56 which is a support means for supporting the test wheel 51 so as to allow the angular displacement. This wheel support mechanism 56 is preferably formed by a universal joint 560, for example. Thereby, the angular displacement of the test wheel 5 can be performed smoothly.

(Electrical Configuration) Next, the electrical configuration of the load transfer test device will be described with reference to FIG. As shown in FIG. 9, the load transfer test device 1 includes limit switches LS11 to LS14, LS21, LS for detecting a limit position of movement of the movable mount 532, the mounting body 4, and the like.
22, LS31 to LS34, LS41 to LS44, and center position detectors PD1, PD2, PD3 for detecting the center position of the test wheel 51 along the running direction L and the lateral direction T and the center position of the specimen 2, respectively. , Aquarium 71
A temperature sensor TD for detecting a water temperature in the inside, a wheel rotation drive motor 521, a wheel traverse 551, a wheel lifting drive motor 534a, a mounting body drive motor 61, a specimen rotation drive motor 660, and a specimen horizontal drive motor 670. , A circulation pump 72, a heater 73, and an operation control unit 8.

Among the above limit switches, the limit switches LS21 and LS22 are arranged corresponding to the limit positions of the horizontal reciprocating motion along the running direction of the movable mount 532, and the limit switches LS21 and LS22 are connected to the test wheels 51 and LS22. The limit switches LS31 to LS34 are disposed corresponding to the vertical movement limit positions of the wheel drive unit 52.
Are arranged corresponding to the limit positions of the horizontal reciprocating movement of the movable mount 532 along the horizontal direction T, and the limit switch LS
41 to LS44 are arranged corresponding to the limit positions of the horizontal reciprocating movement along the running direction L of the mounting body 4. Further, the limit switches LS51 to LS54 are arranged corresponding to limit positions of horizontal reciprocation of the specimen 2 in the horizontal direction T by the specimen horizontal drive motor 670.

Here, the limit switches LS11, LS
12, LS31, LS32, LS41, LS42, LS
Reference numerals 51 and LS52 are used to limit switches LS13, LS14, LS33, LS34, LS
Reference numerals 43, LS44, LS53, and LS54 are arranged at positions corresponding to the test specimen 2 of 50 cm square.

The operation control unit 8 includes an operation setting unit 81
And a display unit 82, and a main control unit 8 that controls various components in accordance with a predetermined control program and performs various arithmetic processes.
And 3.

The main control unit 83 includes, for example, the operation setting unit 8 in advance.
The drive motor 521 and the like are controlled based on each speed, motion ratio, torque, and the like set in Step 1.

(Operation) Next, FIGS.
The operation of the load transfer test device 1 having the above-described configuration will be described with reference to FIG.

First, as shown in FIG.
With the caster 3b floated by a, the frame-like structure main body to which each mechanism is attached is fixed to the floor surface.

Then, the specimen 2 of, for example, 30 cm square prepared in advance is placed on the mounting body 4 while being held by the box-shaped form 9.

Next, in order to adjust the wheel angle to a desired angle, the mounting hole 542b or the mounting hole 542c is aligned with the mounting hole 544a of the mounting member 544 corresponding to the predetermined wheel angle, and the bolt is removed. The mounting plate member 542 is fixed by being inserted therethrough.
3 and the mounting holes 542a and 543a are aligned and bolts are inserted and fixed in the bolt insertion holes 541a. Thereby, the test wheel 51 and the wheel drive unit 52 are fixed at a predetermined angle.

Here, as shown in FIG.
1 is rotated by 30 ° clockwise as indicated by X1 in the figure around a position indicated by X0 in the figure orthogonal to the running direction L, and is rotated by 30 ° counterclockwise as indicated by X2 in the figure. So that it is displaced between the set positions.

Next, after adjusting the load, the operation setting section 81
In, the specimen speed, so as to meet the predetermined conditions,
Specimen rotation speed, wheel self-propelled speed, wheel traverse speed,
The system is started after setting the second interlocking ratio, drive motor torque, number of tests, and the like.

For example, when only the test wheel 51 is simply horizontally reciprocated, the self-running speed of the wheel, the drive motor torque, and the number of tests are set, and then the test wheel 51 and the specimen 2 are adjusted to the center position. Start reciprocating motion.

The test wheel 51 is connected to the limit switch LS1
1. By detecting the limit position by LS12, as shown in FIG. 11, the distance between one edge position of specimen 2 shown in FIG. 11A and the other edge position shown in 51B in FIG. Reciprocate a predetermined number of times.

As a result, damage such as predetermined wear and deformation occurs on the surface of the specimen 2.

When both the test wheel 51 and the specimen 2 are caused to reciprocate horizontally in the running direction L, the apparatus is started even if, for example, the second interlocking ratio is set.

With this initial setting, the degree of relative movement between the test wheel 51 and the specimen 2 is selected in a wide range.

Here, when the second interlocking ratio is 100%, for example, as shown in FIG. 12, the speed Va when the arbitrary point P on the peripheral surface of the test wheel 51 touches the specimen 2 at the ground is , The size and the direction of the specimen are the same as the velocity Vb.

Further, for example, by changing the magnitude of the wheel self-propelled speed and the specimen speed and appropriately setting the value of the torque of the drive motor 521, the occurrence of slip when the test wheel 51 is rotated can be reduced. It is also possible to control the presence or absence.

For examining the test wheel 51 to be applied to a curved portion of a road, for example, the wheel angle adjusting unit 54 adjusts the wheel angle to a predetermined wheel angle at the same time, sets the wheel traverse speed at the same time, Is moved repeatedly in the lateral direction T to reproduce the damage situation when applied to the curved portion.

When it is desired to perform the test in a water immersion state, after the water temperature is set to a predetermined value, the circulating pump 72 is operated, and the specimen 2 is immersed in the water tank 71 under the above-mentioned reciprocating motion. Test in combination with

Further, in this example, as shown in FIG.
The test of the test wheel 51 while rotating the test piece 2 is possible.

More specifically, as shown in FIG.
First, the specimen 2 is rotated in the θ1 direction (a specimen rotating step). Next, while rotating the test wheel 51 in the θ2 direction, as shown in the Z direction in FIG.
(The test wheel sliding contact process).

It is preferable that the rotation speed of the test wheel 51 and the rotation speed of the specimen 2 be set in advance to be substantially the same (rotation speed setting step). At this time, the brake is applied to the test wheels 51 toward the center of the specimen 2.

In order to obtain the same orbital rotation between the test wheel 51 and the specimen 2, for example, if the rotation speed of the specimen 2 is 10
In the case of rpm, at the position of the width A in FIG.
= 100 mm, the rotation speed of the test wheel 51 is 5 rp.
m, and at a position between the widths B, B = 20
At 0 mm, the rotational speed of the test wheel 51 is preferably set to 10 rpm. At the position of the width C, when C = 300 mm, the rotational speed of the test wheel 51 is preferably set to 15 rpm. When D = 400 mm, the rotation speed of the test wheel 51 is preferably set to 20 rpm.

Then, as shown in FIG. 13B,
The surface of the test piece 2 is cut into a substantially circular shape by the test wheel 51 to form a concave portion 2a.

In addition, when the test wheel 51 is subjected to an angle change in the θ3 direction, a lateral swing state is added, and the tolerance is increased. Here, at the time of this lateral swing, the universal joint 560 shown in FIG. 3 can move following the vertical movement and the movement due to the angle change. Also,
While allowing a change in the angle of the test wheel 51, it is possible to support the test wheel 51 while preventing the reference position from shifting in the lateral direction.

By such an angle change, the rubbing state of the contact surface can be tested. This angle change may be performed while rotating, or may be brought into sliding contact with a fixed angle in advance. Therefore, for example, a situation where the tire slips on a curved slope or the like can be realized by the test device.

As shown in FIG. 13C, a traverse test can be performed by horizontally moving one or both of the test wheel 51 and the specimen 2 in the T direction in this state. (Traverse step). by this,
The second concave portion 2b is further formed inside the concave portion 2a. Here, the traverser speed in this case is a value obtained by multiplying the rotation speed of the specimen horizontal drive motor 670 by the moving distance in the T direction.

As described above, according to the present embodiment, the specimen can be moved in the running direction L together with the rotational driving of the test wheel 51. Therefore, for example, the test wheel 51 The relative speed with respect to the specimen 2 can be set in a wide range.

In particular, by interlocking the drive motor 521 and the drive motor 61 so as to keep the second interlock ratio constant, the relative speed of the test wheel 51 with respect to the specimen 2 can be reliably and accurately adjusted. This allows accurate speed measurement in a wide range.

Therefore, for example, a very low speed state can be easily and stably realized, and the damage situation at an intersection, a parking lot, or the like is easily and faithfully reproduced.

Further, by controlling the torque of the drive motor 521 to maintain a substantially constant value, a desired speed can be reliably obtained, and by appropriately setting the value of the torque, for example, when a slip occurs, Wear conditions and the like can be faithfully reproduced.

Further, since the test wheel 51 can be angularly displaced on the horizontal plane with respect to the running direction L together with the rotational driving of the test wheel 51, the material applied to the place where the steering wheel is likely to be turned is deformed. It can be used to faithfully reproduce the state of occurrence of breakage such as wear and abrasion, and perform highly reliable evaluation.

In particular, by controlling the test wheels 51 to move in the lateral direction T by the traverse mechanism 55, it is possible to faithfully reproduce, for example, the state of occurrence of deformation, wear, and the like in the curved portion of the road.

Furthermore, since the test specimen can be rotated together with the rotation of the test wheel, the material to be applied to a place where the steering wheel is likely to be turned is, for example, a curved portion or a curved slope portion of a road, for example, a curved portion. The test equipment can realize the situation where the tire slips on a sloping slope, etc., and faithfully reproduces the occurrence situation of damage such as deformation and wear,
It can be used to make reliable evaluations.

Further, by rotating the test piece, for example, the relative speed of the test wheel with respect to the test piece can be set in a wide range by a combination of the movements of the two, and the deformation and wear can be precisely performed with high fidelity corresponding to various conditions. It can be used to reproduce the situation of damage such as damage and perform highly reliable evaluation.

Further, by moving the test wheel along the lateral direction by one or both of the traverse mechanism and the specimen traversing means, the material applied to the place where the lateral displacement is likely to occur due to centrifugal force or the like is deformed or worn. This can be used to faithfully reproduce the state of occurrence of breakage such as damage and perform highly reliable evaluation.

Further, the motor torque of the wheel driving means is:
Since it is controlled to maintain a substantially constant value, a desired speed can be reliably obtained, and, for example, by appropriately setting a torque value, for example, a wear state when a slip occurs can be faithfully reproduced. Can be.

[Second Embodiment] Next, a second embodiment according to the present invention will be described with reference to FIG. In the following, description of substantially the same configuration of the first embodiment will be omitted, and only different portions will be described. FIG. 14 is a front view showing the accelerated friction durability test device of this example.

In the above-described first embodiment, the configuration is such that the mounting body moving mechanism 6 (see FIG. 1) for horizontally moving the mounting body 4 is provided, but in this embodiment, this mechanism is omitted. The configuration is as follows. With this configuration, it is possible to reduce the size of the device and save space while achieving the same operation and effects as those of the first embodiment.

[Third Embodiment] Next, a third embodiment according to the present invention will be described with reference to FIG. FIG. 15 discloses a modified example of the angular displacement means for angularly displacing the test wheel in the load transfer test device according to the present invention.

As shown in the figure, in the load transfer test apparatus 700 of this embodiment, a load 703 formed by a test wheel or the like as an angular displacement means, a support 704 supporting the load 703, A connecting rod 705 serving as a first connecting member disposed on the support 704 and a connecting pipe 7 serving as a second connecting member connected to the connecting rod 705 so as to be angularly displaceable.
06, and a hydraulic cylinder 710 composed of a piston rod 710B and a cylinder body 710A provided in the connecting pipe 706. The hydraulic cylinder 710 is fixed to the frame-shaped structure 702, and the loading section 703 is placed on the specimen 701.

In such a configuration, as described later, the angular displacement in the θ3 direction is enabled by a special connection state between the connection pipe 706 and the connection rod 705.

The loading section 703 is formed by a single test wheel, a rubber block, or the like. The support 704 is formed in a gate shape (substantially U-shaped cross section) to support the loading section 703, and supports the loading section 703 rotatably or non-rotatably.
When the loading section 703 is a test wheel, it is preferable that the loading section 703 is rotatably supported, and when the loading section 703 is a rubber block, it is preferably configured to be non-rotatably supported. Further, the support 704 is not limited to the gate shape, and may be formed in an L shape.

The support 4 has a gate-shaped state up and down, and a connecting rod 705 is protruded or arranged and fixed at the upper end thereof.

The connecting pipe 706 is for connecting the connecting rod 705 and is formed, for example, in a pipe shape.

The connecting rod 705 and the connecting pipe 706 may be any as long as they can be connected in a male-female relationship. Therefore, a configuration in which a connecting pipe is provided on the gate-shaped support 704 and a connecting rod is provided on the hydraulic cylinder 710 side may be adopted.

Here, the connection state between the connection pipe 706 and the connection rod 705 will be described in detail.

For example, as an example, in FIG. 15, a connecting rod 705 is inserted into a connecting pipe 706 and these are connected to pins 7.
07.

As another example, as shown in FIG. 16, for example, a single ridge 708 is formed in the longitudinal direction of the outer peripheral surface of the connecting rod 705, and the connecting pipe 706 is connected to the ridge 708. One or more concave grooves 709 that can be combined are formed. When a plurality of concave grooves 709 are formed, any one of them is selectively used, and the concave groove 709 and the ridge 708 are engaged with each other to connect the connecting pipe 706 and the connecting rod 705. .

The connection by the above-mentioned pin 707, the ridge 708
The connection by the groove 709 has a function of preventing the set angle of the loading portion 703 from being changed accidentally.

When using the load transfer test apparatus 700 of this embodiment, the load section 703 is used with the load section 703 facing down.
That is, the lower end of the loading portion 703 is in contact with the specimen 701, and the hydraulic cylinder 710 is disposed above and the connecting pipe 706 is connected to the piston rod 710 of the hydraulic cylinder 710.
B. Thereby, it can be used by applying a load from above. Therefore, the connecting rod 705, the support 704, and the loading portion 703 are not accidentally detached from the connecting pipe 706.

Here, the connecting rod 70 is connected to the connecting pipe 706.
In the case of attaching 5, the loading portion 703 is connected at an angle of ± 90 degrees with respect to the virtual traveling direction. Therefore, for example, a hole is formed in the outer peripheral surface of the connecting rod 705, and a plurality of holes are formed in the connecting pipe 706 at different angles, and the holes of the connecting pipe 706 are selectively used. The hole of the connecting rod 705 and the hole of the connecting pipe 706 are
It is preferable to form it so that it is fixed at 7.

The loading section 703 is set on the prepared specimen 701 and a motor (not shown) is operated to cause the loading section 703 to reciprocate or reciprocate (or the loading section 703 is stopped and 701 may be reciprocated). In this case, the hydraulic cylinder 710 described above
This causes the vehicle to travel or move while applying a downward load, whereby a rutted deformation is formed by the traveling locus of the loading portion 703 (for example, a test wheel).
In this case, since the loading section 703 keeps the above-mentioned angle constant, it is possible to reproduce a curved site such as a crossroad or a three-way intersection.

It is to be noted that the connecting rod 705 is not provided with the ridge 708, and the connecting pipe 706 is not provided with the concave groove 709.
As shown in (B), the connecting rod 705 may be formed in a polygonal rod shape, and the connecting pipe 706 may be formed in a polygonal cylindrical shape corresponding to the connecting rod 705 formed in the polygonal rod shape. In this case, the loading section 703 can give a desired angle only by selecting a desired angle with respect to each other and inserting the connecting rod 705 into the connecting pipe 706.

[Fourth Embodiment] Next, a fourth embodiment according to the present invention will be described with reference to FIG. FIG. 18 shows an accelerated friction durability test apparatus of this example.
It is a perspective view which shows the modification of a sample rotation drive means.

In the load transfer test apparatus of the present example, the specimen rotating drive means is disposed below the specimen 701 and can rotate in the θ1 direction, as shown in FIG. A plurality of spheres 712 rotatably disposed on the lower bottom surface of the specimen receiving base 711;
2, a plate 713 which is placed so as to allow rotation and forms a fixed bottom surface, a gear 717 which meshes with a gear groove 716 formed on the specimen receiving base 711, and the gear 717 is θ
A drive motor M that is a drive mechanism that rotates in four directions;
It is comprised including.

The specimen holder 711 has, for example, a substantially U-shaped cross section and a substantially circular plane shape. A plurality of spheres 712 are rotatably fitted to the lower bottom surface of the test sample receiving base 711. Then, the plurality of spheres 71
A plate body 713 is formed at a lower portion of 2. Therefore, the specimen receiving base 711 is set to θ on the fixed plate 713.
As it rotates in one direction, a plurality of spheres 712 in the same direction
The rotation of the specimen holder 711 is also permitted by rolling.

A support shaft 714 is fixed to the rotation center region of the test sample receiving base 711, and a test sample 701 is fixed to the upper end side of the support shaft 714.

Further, a gear groove 716 is formed on the upper surface of the rising portion 715 of the specimen receiving base 711, and the gear groove 716 is engaged with a gear 717 provided on the rotation shaft of the drive motor M. The specimen support 711 rotates around the support shaft 714 by the operation of. Further, by stopping the operation of the drive motor M, the specimen 70
The angle with respect to the first loading portion 703 can be arbitrarily changed. Thus, the specimen 701 can be rotated.

In this example, the specimen rotating drive means is used to rotationally drive the specimen 701. However, since the relative position between the specimen 701 and the loading portion (test wheel) can be changed, It may be used as angular displacement means (angular displacement mechanism, second angular displacement means) for arbitrarily displacing the angle of the loading section. In this case, the angular displacement can be performed by changing the direction of the specimen.

[Fifth Embodiment] Next, a fifth embodiment according to the present invention will be described with reference to FIGS. FIG. 19 is a perspective view showing another modified example of the specimen rotating drive means in the accelerated friction durability test apparatus of this example, and FIG. 20 is a partially cutaway side view taken along line AA of FIG.

In the load transfer test apparatus of the present example, the specimen rotating drive means 800 includes the specimen 8 as shown in FIG.
01, a specimen support 811 which functions as a rotating table which is formed in a substantially disk shape and rotates, and which is arranged in a substantially ring shape around the specimen support 811. It is configured to include a receiving base 819 functioning as a guide wall for guiding the rotation of 811, and wheels 818 that are moving members that move along the receiving base 819.

More specifically, as shown in FIGS. 19 and 20, wheels 818 are arranged at desired intervals on the lower surface on the peripheral side of the specimen receiving stand 811. The cradle 819 is formed in a substantially U-shaped cross section (or a substantially L-shaped cross section having a rising portion 815 as a whole is a donut shape), and the rising portion 815 is formed on a U-shaped side portion. . The wheels 818 move along the rising portion 815, and thereby, the specimen receiving stand 8
11 rotates in the θ1 direction. Note that these specimen rotation driving means 800 are disposed below the accelerated friction durability test apparatus of this example.

Then, as shown in FIG. 20, the specimen receiving base 811 to which the plurality of wheels 818 are connected is
9 Combine the upper surface so that it can run. Then, the wheel 818
The rising portion 81 on the cradle 819
The specimen holder 811 is rotatable along 5.

[0130] When the specimen holder 811 is fixed in a non-rotating manner, it can be realized by inserting a wedge 820 between the rising portion 815 and the wheel 818.

That is, the wedge 820 is, for example, as shown in FIG.
As shown in the figure, it is formed in a gate shape, and one of the pieces, that is, a piece located inside the receiving base 819 is formed in a wedge shape, and the other piece is located outside the rising portion 815 of the receiving base 819, The bolt 823 may be inserted into the hole 822 formed in the outer piece 821, and the bolt 823 may be pressed against the outer wall of the rising portion 815.

Further, this wedge-shaped wedge 820 was formed.
The front and rear movements of the specimen holder 811 can also be prevented by disposing them on the front and rear sides of one wheel 818.

As described above, in this example, the specimen can be rotated. By connecting a rotary drive motor, which is a rotary drive mechanism (not shown), to the specimen receiving table, by configuring the specimen rotary drive means of this example,
Automatic rotation control of the specimen becomes possible.

In this example, the specimen rotating drive means was used to rotationally drive the specimen, but the relative position between the specimen and the loading section (test wheel) can be changed. May be used as an angle displacement means (an angle displacement mechanism, a second angle displacement means) for arbitrarily displacing the angle. In this case, the angular displacement can be performed by changing the direction of the specimen.

Although the apparatus and the method according to the present invention have been described according to some specific embodiments thereof,
Those skilled in the art can make various modifications to the embodiments described in the text of the present invention without departing from the spirit and scope of the present invention. For example, in each of the above-described embodiments, a case has been described in which a specimen prepared in advance is used, but a specimen cut directly from the site may be used.

[Sixth Embodiment] First, the overall schematic structure of the load transfer test device according to the present invention will be described with reference to FIGS.

FIG. 21 is a front view showing the configuration of the load transfer test device of this example. FIG. 22 is a side view showing the configuration of the load transfer test device of this example. FIG. 23 is an explanatory view showing a schematic configuration in which a test specimen and a test wheel portion of the load transfer test device are extracted, (A) is a plan view, and (B) is a front view.

As shown in FIGS. 21 and 22, the load transfer test apparatus 1A of this example applies a transfer load to a test piece 2A made of an asphalt mixture, and performs a test used to perform a quality test of the test piece 2A. A frame-like structure 3A for assembling using, for example, a channel steel, an angle iron, a steel plate or the like, and attaching and supporting various mechanisms and the like described below;
A test loading device 4A including a test wheel 4A1 for applying a moving load to the test piece 2A from above, a wheel driving unit 4A2 for rotating the test wheel 4A1, and a loading table 5A21 are moved up and down to move the test piece 2A. Specimen lifting / lowering mechanism 5A2 to be moved up and down and mounting table 5 for mounting specimen 2A
A placing body 5A including a specimen moving mechanism 5A1 that also moves the specimen 2A by horizontally reciprocating the specimen elevating mechanism 5A2 including A21, and a load moving test apparatus 1A that is electrically connected to the mounting body 5A. It comprises an operation control unit 6A that operates the mobile test apparatus 1A and controls each component.

Specimen 2A is an asphalt mixture placed in a box-shaped formwork made of metal and has a size of 40 cm × 30 cm.
m and a thickness of about 5 cm.

The traveling loading device 4A includes a test wheel 4A1 reciprocating horizontally on the specimen 2A, a wheel drive unit 4A2 for rotating the test wheel 4A1, a test wheel 4A1 and the wheel drive unit 4A2, and a frame-like structure 3A. And a test support 4A1 that can reciprocate with respect to the on-frame structure 3A along a lateral direction (left-right direction shown in FIG. 3) T that is suspended from the ceiling of the vehicle and the test wheels 4A1 in the traveling direction. A wheel angle adjustment unit 4A4, which is an angular displacement unit that holds an angular displacement of up to 90 degrees in a horizontal plane, for example, clockwise or counterclockwise with respect to L, and a traveling support 4A3, ie, a test wheel 4A1.
And a traverse mechanism 4A5 which is a wheel traverse means for moving the traverse mechanism in the lateral direction T.

Here, the test wheel has an outer diameter of 30c.
m, width 5cm, rubber thickness 1.5cm, rubber hardness 2
A solid tire of 80 ± 3 at 0 ° C. and 78 ± 2 at 60 ° C. is used.

As shown in FIG. 24, the wheel drive unit 4A2
Is a wheel rotation drive motor 4A21 (electric motor) that rotates forward and reverse under the control of the operation control unit 6A, and a pair of sprockets 4A23 and 4A that are power transmission members that transmit the rotational power of the wheel rotation drive motor 4A21 to the test wheels 4A1.
24, a chain 4A22 suspended therefrom, and a test wheel 4A1 connected to the rotation shaft of the sprocket 4A23 and rotating in accordance with the rotation of the wheel rotation drive motor 4A21.

As shown in FIGS. 21 and 22, the traveling support 4A3 can reciprocate along the lateral direction T on both sides on the guide rail 4A31 disposed along the lateral direction T on the ceiling 3A1. A movable base 4A32 placed on the
A mounting shaft 4A33 vertically attached to the center of the moving base 4A32 and a lower end to which the test wheel 4A1 and the wheel driving unit 4A2 are attached, and a wheel including a drive motor 4A34a for vertically moving the test wheel 4A1 in the vertical direction. It has a wheel elevating mechanism 4A34 as an elevating means. By the above-mentioned wheel lifting / lowering mechanism 4A34, depending on the size of various specimens 2A and the size of the test wheel 4A1,
The reference position can be adjusted.

Here, the maximum reciprocating speed of the test wheel 4A1 by the drive motor 4A34a is 300 mm / s.

Further, in the load adjusting mechanism 4A35,
It is adjusted so that a load can be applied in a range of ± 20 kg with respect to a standard load of 70 kg in the wheel tracking test.

As shown in FIGS. 24 and 25, the wheel angle adjusting portion 4A4 (angular displacement means, angular displacement mechanism) is fixed to the lower end of the mounting shaft 4A33, and has a bolt through hole of a predetermined diameter concentrically with respect to the center. It has a fixed mounting plate member 4A41 formed with 4A42 and a mounting flange 4A43 fixed to the test wheel 4A1 side and having a bolt mounting hole 4A44 formed at a position corresponding to the bolt through hole 4A42.

The bolt through hole 4A42 and the bolt mounting hole 4
A44 is formed at an angle interval of 5 degrees with respect to the rotation axis, and the test wheel 4A1 and the wheel drive unit 4A2 are each rotated clockwise and counterclockwise on the horizontal plane by 5 degrees with respect to the traveling direction L up to 90 degrees. It is to be displaced.

The test wheel 4A1 and the wheel drive unit 4A2
Is a bolt through hole 4A42 corresponding to a predetermined wheel angle.
And a bolt mounting hole 4A44, and then a bolt is inserted from above the bolt through hole 4A42, and the bolt is inserted into the bolt mounting hole 4A43 formed in the mounting flange 4A43.
It is fixed at a predetermined wheel angle by being screwed into A44 (female screw).

As shown in FIG. 22, the traverse mechanism 4A5 includes a wheel traverse drive motor 4A51 that rotates forward and backward.
And are arranged along the horizontal direction T on the ceiling 3A1,
A screw screw 4A52 to which the rotational movement of the wheel traverse drive motor 4A51 is transmitted and rotated and a male screw is screwed.
And the screw 4 fixed to the moving base 4A32.
A52 and a nut portion 4A53 for screwing with the A52.

Here, the wheel traverse drive motor 4A5
1, the reciprocating speed (wheel traverse speed) of the test wheel 4A1 along the lateral direction T is 30 to 100 mm / s, and the stroke is 200 mm.

As shown in FIG. 21, the specimen moving mechanism 5A1 is arranged along the traveling direction L on the floor 3A2 with the specimen driving motor 5A11 rotating forward and backward, and the rotational movement of the specimen driving motor 5A11 is performed. A screw screw 5A12, which is transmitted and rotates and is provided with a male screw, and a guide rail 5A1 arranged along the traveling direction L on the floor 3A2.
3 has a nut portion 5A15 fixed to a movable base 5A14 mounted reciprocally along the traveling direction L and screwed with a screw screw 5A12.

Here, the speed of the reciprocating motion of the moving base 5A14 by the specimen driving motor 5A11, that is, the specimen 2A in the running direction L (the specimen speed) is 300 mm / max.
s, the stroke is 350 mm.

The specimen raising / lowering mechanism 5A2 is provided with a mounting table 5A21 on which the specimen 2A is mounted, a drive motor that rotates forward and backward, and a rotational motion of the drive motor (not shown). It has a screw screw which is rotated and has a male screw, and a nut portion which is screwed with the screw screw.

Here, the vertical speed of the specimen lifting mechanism 5A2 in the vertical direction V is 26 mm / s, and the stroke is 10 mm.
0 mm.

The operation control section 6A has a control panel 6A1 and a relay panel (not shown) attached to the frame-like structure side. Each mechanism is activated or stopped on the panel surface of the control panel 6A1. From the operation setting unit 6A2 for setting the wheel rotation speed, wheel traverse speed, specimen reciprocating speed, specimen lifting / lowering speed, number of tests, etc., and instruments that indicate each speed and the current value of the drive motor The display unit 6A3 is provided.

The operation control section 6A includes an operation setting section 6A2
, A display unit 6A3, and a main control unit (not shown) that controls various components according to a predetermined control program and performs various arithmetic processes.

The main control section is, for example, an operation setting section 6A2
, The wheel rotation drive motor 4A21, the wheel traverse drive motor 4A51, the specimen drive motor 5A11, and the like are controlled based on the speeds set in the step (1).

(Operation) Next, FIGS. 21 and 22 will be described.
The operation of the load transfer test device 1A configured as described above will be described with reference to FIG. First, as shown in FIG. 21, the frame-shaped structure 3A to which each mechanism is attached is fixed to the floor surface with the casters floating with the fixing jacks.

Then, a specimen 2A of, eg, 40 cm × 30 cm prepared in advance is placed on the mounting table 5A21 while being held by a box-shaped form.

Next, in order to adjust the wheel angle to a desired angle, the bolt through hole 4A42 corresponding to the predetermined wheel angle is set.
And the bolt mounting hole 4A44, and a bolt is inserted from above the bolt through hole 4A42, and the bolt is inserted into the bolt mounting hole 4A4 formed in the mounting flange 4A43.
4 (female screw). Thereby, the test wheel 4A1
And fix the wheel drive unit 4A2 at a desired angle.

Next, after adjusting the load, the operation setting section 6A
In Step 2, the test object reciprocating speed, the test object elevating speed, the wheel rotation speed, the wheel traverse speed, the number of tests, and the like are set so as to conform to a desired test situation, and the apparatus is started.

For example, when reproducing and evaluating an actual situation in a straight part of a pavement road, the test wheel 4A1 is fixed at the center position without traversing, and
The test is performed by reciprocating A up and down. Therefore, wheel rotation speed, specimen reciprocating speed, specimen elevating speed,
After setting the number of tests and the like, the test wheel 4A1 and the specimen 2A are set to the center position and then started.

After starting the load transfer test apparatus 1A, the specimen 2
26A, as shown in FIG. 26, the reciprocating motion by the specimen moving mechanism 5A1 and the vertical movement by the specimen lifting / lowering mechanism 5A2 are combined to repeatedly move along the path from a to e in the figure.

As a result, the surface of the specimen 2A is damaged by predetermined wear and deformation due to contact with the test wheel 4A1, and the state of the damage is measured to evaluate the specimen 2A.

The speed at which an arbitrary point on the peripheral surface of the rotating test wheel 4A1 touches the specimen 2A and the moving speed at which the specimen 2A moves along the running direction are set to the same value. Is preferably performed.

As described above, in this test, the specimen 2
The surface of A is always subjected to frictional resistance from one direction by the test wheel 4A1, and considering that a normal car or the like travels in one direction on an actual paved road, for example, as in the case of a highway, In this regard, it can be said that the situation is faithfully reproduced. Considering that a test performed by a conventional wheel tracking test device as shown in FIG. 27 evaluates damage such as wear and deformation caused by reciprocation of a test wheel, the load transfer test device 1A according to the present invention provides Thus, more reliable evaluation can be performed with higher fidelity than the conventional wheel tracking test apparatus.

For example, when reproducing and evaluating the actual situation in the curved portion of the paved road, in addition to the above settings, the wheel traverse speed is set, and the test wheel 4A1 is repeatedly moved in the lateral direction T. By causing the vehicle to travel while traveling, it is possible to reproduce and evaluate the state of damage at the curved portion.

In performing the test in the above curve,
The test wheel 4A is set so that the traverse cycle of the test wheel 4A1 and the moving cycle of the test piece 2A are the same in advance.
It is preferable to set a speed at which the specimen 1 moves along a direction T intersecting on the horizontal plane with the traveling direction and a moving speed at which the specimen 2A moves along the traveling direction L.

Further, when performing the test on the curved portion, the sliding state of the contact surface can be tested by giving an angle change to the test wheel 4A1 in advance. This makes it possible to reproduce and evaluate, for example, a situation in which a tire slips while traveling on a curved portion of a pavement road.

[0170]

As described above, according to the present invention,
Since the specimen can be rotated together with the rotation of the test wheel, the material to be applied to the location where the steering wheel is likely to be turned is damaged, for example, deformation such as deformation or abrasion at a curved part or a curved part of the road. This can be used to faithfully reproduce the state of occurrence of, and perform highly reliable evaluation.

Further, since the angles of the test wheels can be changed, it is possible to faithfully reproduce the state of occurrence of damage such as deformation and wear when the steering wheel is turned at the above-mentioned curved slope of the road.

Further, by rotating the specimen, the relative speed of the test wheel with respect to the specimen can be set in a wide range, for example, by a combination of the movements of the two. It can be used to reproduce the situation of damage such as damage and perform highly reliable evaluation.

Further, according to the present invention, since the specimen can be moved up and down, a frictional resistance can be always applied from one direction to the surface of the specimen together with the rotational driving of the test wheel. It is possible to accurately reproduce the state of occurrence of breakage such as deformation and wear with higher fidelity than the test device, and perform highly reliable evaluation.

Further, by performing the test while traversing the test wheels, it is possible to accurately and accurately reproduce the occurrence of damage such as deformation and wear on the curved portion of the actual pavement road with high fidelity. High evaluation can be performed.

Further, when performing the test in the curved portion, the slip condition of the contact surface can be tested by giving an angle change to the test wheel 41 in advance. This makes it possible to accurately reproduce, for example, a situation in which a tire slips while traveling on a curved part of a paved road with high fidelity,
A highly reliable evaluation can be performed.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an embodiment of a load transfer test device according to the present invention.

FIGS. 2A and 2B are explanatory views showing a schematic configuration of the load transfer test apparatus. FIGS.

FIG. 3 is a side view showing a schematic configuration of the load transfer test device.

FIG. 4 is a plan view showing a configuration of the load transfer test device.

FIG. 5 is a side view showing a test wheel and a wheel drive unit constituting the load transfer test device.

FIG. 6 is a front view showing the test wheel and a wheel drive unit.

FIG. 7 is a sectional view taken along the line BB of FIG. 6;

FIG. 8 is an exploded perspective view schematically illustrating a configuration of a wheel angle adjustment unit.

FIG. 9 is a block diagram showing an electrical configuration of the load transfer test device.

FIG. 10 is an explanatory diagram for explaining a method of angular displacement in the wheel angle adjustment unit.

FIG. 11 is an explanatory diagram for explaining an operation of the accelerated wear test device.

FIG. 12 is an explanatory diagram for explaining a method in which the speeds of the test wheel and the specimen are linked.

FIGS. 13A, 13B, and 13C are explanatory views for explaining the operation of the accelerated wear test apparatus.

FIG. 14 is a front view showing an example of an embodiment of a load transfer test device according to the present invention.

FIG. 15 is a perspective view showing an example of an embodiment of a load transfer test device according to the present invention.

FIG. 16 is an exploded perspective view showing a relationship between a connecting rod and a connecting pipe used in the apparatus shown in FIG.

FIGS. 17A and 17B are cross-sectional views showing another example of a connecting rod and a connecting pipe used in the load transfer test device according to the present invention.

FIG. 18 is a perspective view showing an example of an embodiment of a load transfer test device according to the present invention.

FIG. 19 is a perspective view showing an example of an embodiment of a load transfer test device according to the present invention.

FIG. 20 is a partially broken side view in which a portion AA of FIG. 19 is partially broken.

FIG. 21 is a front view showing an example of an embodiment of a load transfer test device according to the present invention.

FIG. 22 is a side view showing an embodiment of the load transfer test device.

FIGS. 23A and 23B are explanatory diagrams showing a schematic configuration of the load transfer test device. FIGS.

FIG. 24 is a perspective view showing a test wheel, a wheel drive unit, and a wheel angle adjustment unit which constitute the load transfer test device.

FIG. 25 is a side view showing a test wheel, a wheel drive unit, and a wheel angle adjustment unit that constitute the load transfer test device.

FIG. 26 is a front view showing the trajectory of the test specimen during the test of the load transfer test device.

FIG. 27 is a front view showing a conventional wheel tracking test device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Load transfer test apparatus 2 Specimen 4 Mounting body 5 Travel loading device (travel loading mechanism) 51 Test wheel 52 Wheel drive unit 521 Wheel rotation drive motor (electric motor) 534 Wheel lifting mechanism 54 Wheel angle adjustment unit (Angle displacement mechanism) 56 Wheel support mechanism 66 Specimen rotation drive mechanism 67 Specimen horizontal drive mechanism 1A Load transfer test device 2A Specimen 3A Frame structure 3A1 Ceiling 3A2 Floor 4A Travel loading device (travel loading mechanism) 4A1 Test wheel 4A2 Wheel drive Part 4A21 Wheel rotation drive motor 4A22 Chain 4A23 Sprocket 4A24 Sprocket 4A3 Travel support 4A31 Guide rail 4A32 Moving base 4A33 Mounting shaft 4A34 Wheel lifting mechanism 4A34a Drive motor 4A35 Load adjustment mechanism 4A4 Wheel angle adjustment plate 4 A4 Wheel angle adjustment plate 4A 42 bolt through hole 4A43 mounting flange 4A44 bolt mounting hole 4A5 traverse mechanism 4A51 wheel traverse drive motor 4A52 screw screw 4A53 nut part 5A mounting body 5A1 specimen moving mechanism 5A11 specimen driving motor 5A12 screw screw 5A14 guide rail base 5A14 Nut part 5A2 Specimen elevating mechanism 5A21 Mounting table 6A Operation control part 6A1 Control panel 6A2 Operation setting part 6A3 Display part

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Tamotsu Banno 7-13-14 Nobomu, Niiza-shi, Saitama Nikken Co., Ltd. F-term (reference) 2D053 AA33 AB01 AC01 AC02 AD03 FA01

Claims (23)

[Claims] 1. A load transfer test apparatus for moving a test wheel by a traveling loading means and applying a load by the test wheel to a specimen on a pavement road surface to perform a quality test of the specimen. A load transfer test device, comprising: a wheel rotation driving unit that rotationally drives a test wheel; and a specimen rotation driving unit that rotationally drives the specimen. 2. The load according to claim 1, further comprising a specimen traversing means for moving the specimen along a direction intersecting a running direction of the test wheel on a horizontal plane. Mobile test equipment. 3. The load transfer test apparatus according to claim 1, further comprising an angular displacement means for angularly displacing the test wheel on a horizontal plane with respect to a running direction. 4. The load transfer test device according to claim 3, further comprising a support means for supporting the test wheel to allow an angular displacement of the test wheel. 5. The load transfer test apparatus according to claim 1, further comprising a wheel elevating means for moving the test wheel up and down. 6. The vehicle according to claim 1, further comprising a wheel traversing means for moving the test wheel along a direction intersecting a running direction on a horizontal plane. The load transfer test device as described. 7. The load transfer test apparatus according to claim 1, further comprising a test piece moving means for moving the test piece along a traveling direction. 8. A speed ratio of an arbitrary point on the peripheral surface of the rotating test wheel at the time of touching the test object to the test object and a moving speed of moving the test object along the traveling direction to maintain a predetermined ratio. 8. The load transfer test apparatus according to claim 7, wherein the wheel drive rotating unit and the specimen moving unit are interlocked and controlled. 9. The apparatus according to claim 1, wherein the wheel rotation driving means includes a motor for driving the test wheel to rotate, and a torque of the motor is controlled to maintain a predetermined constant value. The load transfer test device according to claim 8. 10. The specimen rotating drive means includes: a specimen receiving base provided with a gear groove formed substantially circularly around a rotation center axis that supports and rotates the specimen; The load transfer test device according to any one of claims 1 to 8, further comprising a gear that meshes with the drive gear and a drive motor that drives the gear to rotate. 11. The specimen rotating drive means includes: a rotating table that supports and rotates the specimen; a guide wall that is disposed around the rotating table to guide rotation of the rotating table; The load transfer test device according to any one of claims 1 to 8, further comprising a wheel connected to a table and moving along the guide wall. 12. The test wheel is laterally displaced by the specimen traversing means while the specimen is rotated while the test wheel is being rotated while the test wheel is being held at the predetermined angle by the angular displacement means. The load transfer test device according to any one of claims 3 to 8, wherein the load transfer test device is controlled so as to move in a direction. 13. A first connecting member disposed on a support that rotatably supports the test wheel, and a second connecting member that is angularly displaceable connected to the first connecting member. The load transfer test device according to claim 3, further comprising: a connecting member. 14. A load transfer test method for applying a moving load to a specimen on a pavement road surface to perform a quality test of the specimen, the method comprising: A specimen rotating step of rotating the specimen in a substantially horizontal plane, and a test wheel sliding contact step of rotating the test wheel and slidingly contacting the specimen while rotating the specimen. Load transfer test method. 15. The load transfer test method according to claim 14, further comprising a rotation speed setting step of setting a rotation speed of the test wheel and a rotation speed of the specimen to be substantially the same. 16. The apparatus according to claim 14, further comprising a traverse step of moving the test wheel relative to the specimen along a direction intersecting a running direction of the test wheel on a horizontal plane. Or the load transfer test method according to claim 15. 17. A load transfer test apparatus for applying a load to a test piece by a test wheel to perform a quality test of the test piece, wherein: a wheel rotation driving means for driving the test wheel to rotate; A load transfer test apparatus comprising a mounting body on which a test body is mounted, wherein the mounting body has a test body elevating means for moving the test body up and down. 18. The load movement test apparatus according to claim 17, wherein the mounting body further comprises a test object moving means for moving the test object along a traveling direction of the test wheel. 19. The load transfer test apparatus according to claim 17, further comprising an angular displacement means for displacing the test wheel on a horizontal plane with respect to a traveling direction. 20. The load transfer test device according to claim 17, further comprising a wheel traverse means for moving the test wheel along a direction intersecting a running direction on a horizontal plane. 21. The load transfer test apparatus according to claim 17, further comprising a wheel elevating means for moving the test wheel up and down. 22. A speed ratio of an arbitrary point on the peripheral surface of the rotating test wheel at the time of touching the test object to the test object and a moving speed at which the test object moves along a traveling direction is maintained at a predetermined ratio. 18. The load transfer test apparatus according to claim 17, wherein the wheel drive rotating unit and the specimen moving unit are interlocked. 23. A moving speed of moving the test wheel along a direction intersecting a running direction on a horizontal plane with a moving speed of moving the test piece along the running direction is maintained at a predetermined ratio. 18. The apparatus according to claim 17, wherein the wheel traverse means and the specimen moving means are interlocked.
The load transfer test device as described.