JP3401161B2 - Rolling fatigue test device and rolling fatigue test method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a railway vehicle wheel.
Wheels tested by rolling a certain wheel specimen on rails specimen
Rolling fatigue test equipment for performing fatigue testing of one or both of body and rail specimen , and rolling fatigue test method using the equipment
It is about law .

[0002]

2. Description of the Related Art Conventionally, as a rolling fatigue test apparatus, a wheel test piece, which is a wheel for a railway vehicle, is repeatedly rolled on a rail test piece to perform a fatigue test on one or both of the wheel test piece and the rail test piece. The one shown in FIG. 3 was known. Figure 3
FIG. 3 is a diagram showing a configuration of a conventional rolling fatigue test apparatus, FIG. 3 (A) is a rear view and FIG. 3 (B) is a side view.

As shown in the figure, this rolling fatigue test apparatus 2
00 is a frame 5, a vertical drive unit 6, and a horizontal drive unit 7.
And a slip adjusting unit 8.

The frame 5 is a structure for mounting or supporting each of the vertical drive unit 6, the horizontal drive unit 7, and the slip adjusting unit 8, and includes a bottom plate 51, a columnar member 52, and a beam member 53.
And a shaft support member 54. The bottom plate 51 is a thick plate-shaped member formed of a material such as steel, and four columnar members 52 are provided upright at almost four corners of the upper surface of the bottom plate 51. Two beam-shaped members 53 are provided on the tops of the columnar members 52, and the beam-shaped members 53 are fixed at the respective tops. A shaft support member 54 is mounted on the one beam member 53. A hinge fulcrum B is provided on the shaft support member 54.

The vertical drive section 6 is a section for driving the rail test piece R through a wheel test piece W, which is a wheel for a railway vehicle, so as to apply a vertical repeated load, and is a hydraulic cylinder 61.
A vertical drive member 62, a connecting member 64, and a tension member 6
Have five. The vertical drive member 62 is a beam-shaped member, and one end thereof is hinge-supported by the hinge fulcrum B of the shaft support member 54. Therefore, the vertical drive member 62 is
A lever having a hinge fulcrum B as a swing center is configured to swing by vertically driving a point A (described later) at the tip of the vertical drive member 62. Vertical drive member 6
A wheel specimen W is attached from below in the vicinity of the center of the wheel 2. Further, the wheel sample W is configured to be able to roll around the wheel center axis.

The hydraulic cylinder 61 is a device for moving the piston 61P in and out by the pressure of oil supplied or discharged therein, and the lower end thereof is hingedly supported by the bottom plate 51. A pulling member 65 is attached to the piston 61P, and a connecting member 64 is provided at the other end of the pulling member 65. The connecting member 64 is hinged to the vertical drive member 62 by the hinge fulcrum A.

The horizontal drive section 7 is a section for driving the rail test piece R so as to give horizontal repetitive motion, and includes an electric motor 71, a belt wheel 72, a belt 73, a belt wheel 74, and gears 75 and 76. It has a crank rod 77, a horizontal drive member 78, and traveling wheels 79.

A belt wheel 72 is attached to the drive shaft 71D of the electric motor 71, and the rotational driving force of the belt wheel 72 is
It is transmitted to the other belt wheel 74 by the belt 73.
A gear 75 is attached to the shaft of the belt wheel 74 and meshes with the gear 76. An arm 76A is attached to the shaft of the gear 76.
A crank rod 77 is attached to A. A horizontal drive member 78 is connected to the tip of the crank rod 77 via a hinge fulcrum C. A traveling wheel 79 is provided below the horizontal drive member 78, and the bottom plate 5 of the frame 5 is provided.
It is configured to be able to travel back and forth on one. A rail test piece R is fixed to the upper part of the horizontal drive member 78.

The slip adjusting portion 8 is a portion that drives the rail test piece R so as to give a slip, and has an adjusting top 80 and a top engaging portion 81. The top engaging portion 81 is attached to the upper part of the horizontal drive member 78, is movable in the left-right direction in the drawing, and can be fixed at any position. The adjusting piece 80 is attached to the rolling shaft of the wheel sample W and is configured to be engageable with the piece engaging portion 81.

With the above structure, the hydraulic cylinder 6
By operating 1 and moving the piston 61P in and out, the vertical drive member 62 is vertically swung about the hinge fulcrum B as a swing center, and a vertical repetitive load can be applied to the wheel specimen W and the rail specimen R. .

On the other hand, at the same time when the hydraulic cylinder 61 is driven,
When the electric motor 71 is operated, the gear 76 is rotated by the belt wheel 72, the belt 73, the belt wheel 74, and the gear 75, and the horizontal drive member 78 is placed on the bottom plate 51 by the arm 76A, the crank rod 77, and the hinge fulcrum C. The rail specimen R can be horizontally reciprocated by reciprocating in the left-right direction in the figure. By this horizontal repetitive motion,
The wheel sample W rolls back and forth on the rail sample R.

At this time, if the shape of the adjusting piece 80 is appropriately adjusted, the movement of the wheel specimen W is restricted, and the wheel specimen W rolls on the rail specimen R while sliding.
Therefore, the slip ratio of the wheel sample W can be adjusted by the shape of the adjusting piece 80.

Conventionally, the rolling fatigue test apparatus 2 as described above is used.
No. 00 was used to conduct a rolling fatigue test for examining wear and damage of the rail alone, the rail welded portion, the rail joint, or the wheel.

[0014]

However, in the above-described conventional rolling fatigue test apparatus, since the horizontal repetitive motion imparted to the rail test piece is driven by the crank mechanism, the reciprocating speed of the electric motor is the same. The sine waveform is the only motion curve that is determined by the number of rotations and that shows the displacement over time. Also, the vertical cyclic load applied to the rail specimen was only simple reciprocating vibration. Further, the slip ratio between the wheel test piece and the rail test piece can be set only by a simple setting.

However, in order to accurately study the fatigue characteristics of the wheels and rails of a railroad vehicle, such a simple drive system is not sufficient, and a test device capable of giving a finer displacement or load is required. However, there is a problem that the conventional test device cannot meet these requirements. In addition, the conventional test equipment is extremely noisy and vibrating,
There was a problem that the test environment was bad.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a quiet rolling fatigue test apparatus capable of finely controlling loads and displacements. is there.

[0017]

In order to solve the above problems, a rolling fatigue test apparatus according to the present invention is a wheel for a railway vehicle.
The wheel test piece (W) is a rail with seams
By rolling on the specimen (R),
Any one of specimen (W) and rail specimen (R)
Rolling fatigue test device (10
0), and the wheel test piece is controlled by oil pressure or oil flow rate.
Vertical drive means (2) for vertically driving (W), and oil
Horizontally move the rail test piece (R) by pressure or oil flow rate.
Horizontal driving means (3) for driving to the vertical direction, and the vertical driving means
The vertical force applied by (2) and the horizontal drive means
Force detection means for detecting the horizontal force applied by (3)
(43V, 43H), the wheel specimen (W) and the
Detects vertical and horizontal displacement of rail test piece (R)
Displacement detecting means (44V, 44H) and the force detecting means
(43V, 43H) detected force and the displacement detection means
Based on the displacement detected by (44V, 44H), the vertical drive is performed.
Hydraulic means in the moving means (2) and the horizontal drive means (3)
Is a control means (41, 42) for electrically servo-controlling the oil flow rate.
And the control means (41, 42) includes the vertical drive
Load or displacement in the means (2) and the horizontal drive hand
The wheel or wheel is tested by controlling the load or displacement in the step (3).
Only when the body (W) is on the rail joint, the vertical
Force is applied, and the waveform of the vertical force is a triangular waveform.
The outbound and inbound travel speeds were increased and the round trip time was shortened.
Make sure that the impulse waveform is impulse-like or spike-like.
Characterized in that that.

Further, the rolling fatigue test method according to the present invention is
The wheel specimen (W), which is a wheel for railway vehicles, is connected to the rail joint.
By rolling on the rail specimen (R) on which
The wheel specimen (W) and rail specimen (R)
One or both of the two
A test method, wherein the wheel specimen is tested by hydraulic pressure or oil flow rate.
Vertical drive means (2) for vertically driving (W), and oil
Horizontally move the rail test piece (R) by pressure or oil flow rate.
Horizontal driving means (3) for driving to the vertical direction, and the vertical driving means
The vertical force applied by (2) and the horizontal drive means
Force detection means for detecting the horizontal force applied by (3)
(43V, 43H), the wheel specimen (W) and the
Detects vertical and horizontal displacement of rail test piece (R)
Displacement detecting means (44V, 44H) and the force detecting means
(43V, 43H) detected force and the displacement detection means
Based on the displacement detected by (44V, 44H), the vertical drive is performed.
Hydraulic means in the moving means (2) and the horizontal drive means (3)
Is a control means (41, 42) for electrically servo-controlling the oil flow rate.
Using a rolling fatigue test apparatus (100) equipped with
The vertical drive means (2) by means (41, 42).
Load or displacement and the horizontal drive means (3)
Control the load or displacement, and the wheel specimen (W) is
The vertical force acts only when the rail joint is reached.
The waveform of the vertical force is a triangular waveform
Impulse shape with high speed and short round trip time
Or, it is characterized by having a spike-like impact waveform
And

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a configuration of an embodiment of a rolling fatigue test apparatus according to the present invention, FIG. 1 (A) is a front view, and FIG. 1 (B) is a side view. As shown in the figure, the rolling fatigue test apparatus 100 includes a frame 1, a vertical drive unit 2 which is a vertical drive unit, and a horizontal drive unit 3 which is a horizontal drive unit.
And a control unit 4.

The frame 1 is a structure for mounting or supporting the respective units of the vertical drive unit 2, the horizontal drive unit 3 and the control unit 4, and includes a bottom plate 11, a columnar member 12, a beam-shaped member 13,
It has a plate-shaped member 14. The bottom plate 11 is a thick plate-shaped member made of a material such as steel, and four columnar members 12 are provided upright at almost four corners of the upper surface of the bottom plate 11. Four beam-shaped members 13 are provided on the tops of the columnar members 12, and the beam-shaped members 13 are fixed at the respective tops of the columnar members 12. A plate support member 14 is attached on the beam-shaped member 13.

The vertical drive unit 2 is a part that drives the rail test piece R through a wheel test piece W, which is a wheel for a railroad vehicle, so as to apply a repeated load in the vertical direction. Member 22 and wheel shaft 23
have. The rail test piece R corresponds to a rolling element.

The vertical hydraulic actuator 21 is a device for moving the piston 21P in and out by the pressure of the oil supplied or discharged therein, and is mounted on the plate member 14. A substantially "inverted U" -shaped vertical drive member 22 is attached to the piston 21P, and a wheel shaft 23 is attached to the lower end of the vertical drive member 22. A wheel sample W is rotatably supported on the wheel shaft 23, and the wheel sample W presses the rail sample R from above.

The horizontal drive section 3 is a section for driving the rail test piece R so as to give a repetitive horizontal motion.
A horizontal hydraulic actuator 31, a horizontal drive member 32,
It has a rail support member 33, a sleeper-like member 34, a rail fixture 35, and a sliding member 36.

The horizontal hydraulic actuator 31 is a device for moving the piston 31P in and out by the pressure of oil supplied or discharged therein, and is attached to the bottom plate 11 of the frame 1. The tip of the piston 31P has a horizontal driving member 3
2 is connected near the center of the end of the horizontal drive member 3
The vicinity of the left and right sides of the end of 2 is supported by two sliding members 36. A substantially plate-shaped rail support member 33 is attached to the horizontal drive member 32. Rail support member 3
A sleeper-like member 34 is fixed on the rail 3, and the rail specimen R is fixed to the rail-like member 34 by a rail or the like 3
It is fixed in a cantilever shape by 5.

With the above-described structure, the vertical hydraulic actuator 21 is actuated, and the piston 21P is moved in and out to vibrate the vertical drive member 22 up and down, so that the wheel test piece W and the rail test piece R are vertically repeated. Can be loaded. At this time, the rail specimen R is
The left and right side portions are supported by two sliding members 36, 36, and reciprocally slide on the sliding members 36, 36 during horizontal reciprocating drive by the horizontal hydraulic actuator 31.

On the other hand, simultaneously with the driving of the vertical hydraulic actuator 21, the horizontal hydraulic actuator 31 is actuated to move the piston 31P in and out to repeatedly drive the horizontal drive member 32 in the horizontal direction, and the rail test piece R is repeatedly moved horizontally. Can be given. By this horizontal repetitive motion, the wheel sample W reciprocally rolls on the rail sample R.

By such reciprocal rolling, the behavior of the rail test piece R such as bending fatigue and cracks due to rolling fatigue can be examined. At this time, since the rail sample R is supported in a cantilever state, when the wheel sample W rolls and moves to the free end side, tensile stress acts on the upper surface side of the rail sample R, Behavior in a composite state of reciprocating rolling and tension can be studied. At the same time, the behavior of the rolling surface of the wheel specimen W can be examined. The rail specimen R can be supported by simple support in addition to the cantilever support described above.

Next, the control in the rolling fatigue test apparatus 100 will be described in detail with reference to FIGS. 1 and 2. FIG. 2 is a block diagram showing a configuration relating to control of the rolling fatigue test apparatus shown in FIG.

As shown in FIG. 2, the control section 4 is a section for controlling the vertical hydraulic actuator 21 and the horizontal hydraulic actuator 31, and includes a controller 41, an electrohydraulic servo mechanism 42, a vertical load detector 43V, and a horizontal load. Load detector 43H, vertical displacement detector 44V, horizontal displacement detector 44H, ROM (Read Only Memory) 45, RAM (Random Access Memory: random write memory) 46, and input operation unit It has 47 and a display unit 48.

The controller 41 is a part that controls each part of the control part 4, and is a CPU (Central Process) not shown.
sing Unit: central processing unit), a D / A converter (not shown), a servo amplifier (not shown), and the like. The CPU is a part that performs processing such as calculation and program execution. The D / A converter is a part that converts a digital control signal from the CPU into an analog signal. Also, the servo amplifier amplifies a minute control signal,
This is a part that drives a control valve described later.

The vertical load detector 43V is a detector for detecting a vertical load acting on the wheel specimen W, and the horizontal load detector 43H is a detector for detecting a horizontal load acting on the rail specimen R. . These load detectors are composed of load cells, strain gauges, or the like. This load cell, strain gauge, or the like measures the strain generated in the member by the load as a change in electrical resistance to detect the load, but a load detector that detects the load by another method can also be used. The vertical load detector 43V and the horizontal load detector 43H correspond to force detecting means.

The vertical displacement detector 44V is a detector for detecting a vertical displacement of the wheel test piece W, and the horizontal displacement detector 44H is a detector for detecting a horizontal displacement of the rail test piece R. These displacement detectors are composed of displacement meters, displacement sensors, or the like. This displacement meter or displacement sensor or the like measures and detects displacement by mechanical, electrical, magnetic, optical, or other method. The vertical displacement detector 44V and the horizontal displacement detector 44H correspond to displacement detecting means. The load detector or the displacement detector described above may be provided for each actuator, one for each of the rail test piece R or the wheel test piece W, or a larger number for finer control. May be provided.

The ROM 45 is a storage device that stores programs executed by the controller 41 and the like. A hard disk or other type of storage device may be used in place of this ROM, and these storage devices may not only be read-only but also writable once or multiple times. The RAM 46 is a storage device that temporarily stores data calculated by the controller 41. A hard disk or other type of storage device may be used in place of this RAM. The input operation unit 47 has a keyboard, a switch, a switching lever, an adjusting knob, or the like, and is a device for inputting a command or the like to the controller 41 from the outside. In addition, the display unit 48
Is a device that displays test results, etc. in numerical values or images,
It includes a CRT (Cathode Ray Tube), a liquid crystal display device, a plasma display, or the like. Although not shown, the controller 41 may have a terminal for outputting the test result data to the outside as an electric signal or the like, and the controller 41 may be connected to a printer or the like for printing output.

Next, the structure of the electrohydraulic servo mechanism 42 will be described. The hydraulic servo mechanism is a general term for a mechanism that feedback-controls a hydraulic actuator including a hydraulic cylinder, a hydraulic motor, or the like by a minute input. This hydraulic servo mechanism includes a mechanical type that performs feedback by a mechanical mechanism such as a link or a cam and an electrical type that performs feedback by an electric mechanism. Further, the electric control includes a type that controls the control valve in an analog type and a type that controls the control valve in a digital type.

As the above control valve, in the analog type,
Servo valves or proportional valves are used. A servo valve is a valve that controls the flow rate or pressure of oil as a function of an electrical input signal, such as a torque motor (not shown), a pre-amplifier (not shown) such as a nozzle flapper valve, and a spool valve. It has a guide valve portion (not shown) and the like.

A proportional valve is a valve that controls the flow rate or pressure of oil as a function of an electric input signal, like a servo valve, and is a type in which the valve is directly operated by a solenoid (not shown).

In the digital type, a high-speed on / off valve or a pulse motor operating valve is used as the control valve. The high-speed on-off valve forms a minute fluid pulse train to control the oil flow rate and pressure. The valve performs a simple on-off operation, and the flow rate is controlled by controlling the time when the valve is open. .

Further, the pulse motor operating valve is operated by a pulse motor which rotates normally or reversely by a pulse signal,
The pulse motor controls the flow rate and pressure of oil, and the pulse motor functions as a kind of D / A converter.

The electrohydraulic servomechanism 42 of this embodiment is
It is the electric hydraulic servo mechanism described above.

An example of the electrohydraulic servo mechanism 42 will be described below. In this case, the electro-hydraulic servo mechanism 42 includes an oil supply source such as an oil tank (not shown) for supplying oil as a working medium, and a hydraulic piping circuit for supplying oil from this oil supply source (for example, 42C), hydraulic actuators 21 and 31 driven by oil to perform a predetermined operation,
A control valve (not shown) for controlling the flow rate and pressure of oil to the hydraulic actuators 21 and 31 is provided. The control valve is controlled by the controller 41. Controller 41
Is a vertical load detector 43V and a horizontal load detector 43H
Based on the signals from the vertical displacement detector 44V and the horizontal displacement detector 44H, feedback control is performed so that the hydraulic actuators 21 and 31 are in proper states. In the above, the controller 41 and the electro-hydraulic servo mechanism 42
Corresponds to the control means.

Next, the electrohydraulic servo mechanism 4 of the present embodiment.
A control method according to 2 will be described. First, a digital drive control signal is output from a CPU (not shown) in the controller 41. This digital drive control signal is converted into an analog drive control signal by a D / A converter (not shown) in the controller 41, amplified by a servo amplifier (not shown), and output to a control valve (not shown). To be done. A control valve (not shown) is controlled by this analog drive control signal, the vertical hydraulic actuator 21 and the horizontal hydraulic actuator 31 are actuated, the axis of the wheel sample W is reciprocally driven in the vertical direction, and the rail sample R is It is driven to reciprocate horizontally.

At this time, for example, the vertical load and the horizontal load of the wheel sample W and the rail sample R are detected by the vertical load detector 43V and the horizontal load detector 43H, and the wheel sample W and the rail sample R are detected. The vertical displacement and the horizontal displacement are detected by the vertical displacement detector 44V and the horizontal displacement detector 44H and sent to the CPU in the controller 41. C
The PU monitors this displacement data, and when it deviates from a predetermined value that is programmed or calculated in advance, changes the control of the control valve so as to return it to the predetermined value. As a result, the loads and the displacements of the wheel test piece W and the rail test piece R are corrected so as to approach the predetermined values which are programmed or calculated in advance. Such control is performed for each of the wheel specimen W and the rail specimen R for each load and displacement.

Further, the speeds of the rail test piece R and the wheel test piece W are detected by differentiating the displacement data from the vertical displacement detector 44V and the horizontal displacement detector 44H by the CPU (not shown) in the controller 41. And can be controlled.

Therefore, this rolling fatigue test apparatus 100
Then, the load or displacement by the hydraulic actuators 21 and 31 can be finely controlled, and the displacement or load can be controlled to have an arbitrary waveform or frequency. Also, the control response speed can be made very high. Furthermore, noise and vibration during driving are very small, and the test environment can be maintained in a good state.

For example, each hydraulic actuator 21, 31
As a motion curve showing the displacement with respect to time,
Not only the conventional sinusoidal waveform but also the triangular waveform movement can be realized. The triangular waveform motion is a reciprocating motion in which the forward speed has a constant value and the backward speed has a constant value in the opposite direction to the forward path. In this case, if the forward and backward speeds are set to be extremely high and the round-trip time is shortened, impulse-like or spike-like shock waveform motion can be achieved.

Further, as a motion curve showing the displacement of each hydraulic actuator 21, 31 over time, a trapezoidal waveform motion can be realized. The trapezoidal waveform motion is a reciprocating motion in which the speed of the outward path is a constant value, a return path motion is performed in a direction opposite to the outward path after stopping for a predetermined time, and the return path speed is a constant value. In this case, if the forward and backward speeds are set to be extremely high, a rectangular waveform can be obtained.

Alternatively, each hydraulic actuator 21, 3
As the motion curve indicating the displacement with respect to the elapsed time in 1, a motion with a more complicated waveform can be realized. For example, it is also possible to control the load or displacement of the vertical hydraulic actuator 21 so as to have a waveform during vibration of a railroad vehicle or the like while traveling.

Further, the waveform of the load or displacement in the vertical hydraulic actuator 21 and the horizontal hydraulic actuator 3
The waveforms of load or displacement in 1 can be controlled independently of each other and can be controlled to be synchronized with each other. By utilizing such control, a rail joint is formed on the rail specimen R, and control is performed so that the vertical impact load acts only when the wheel specimen W comes on the rail joint, and travels on the rail joint. It is also possible to perform a test that reproduces the behavior of a wheel that runs.

Although not shown, torque (rotational force)
And a torque detector (not shown) for detecting the displacement in the rotation direction are provided on the wheel shaft 23, and a torque actuator (for example, a hydraulic motor) that applies a torque around the wheel shaft 23 to the wheel shaft 23. Attach the wheel axle 2
If the torque of 3 is feedback-controlled, the wheel specimen W
It becomes possible to freely control the slip ratio on the rail test piece R. In the above, the torque actuator corresponds to the rotation driving means, and the torque detector and the rotation direction detector correspond to the displacement detecting means.

The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, has substantially the same configuration as the technical idea described in the scope of the claims of the present invention, and has any similar effect to the present invention. It is included in the technical scope of the invention.

For example, in the above embodiment, as an example of a rolling fatigue test apparatus, railroad vehicle wheels are used as wheels, rails are used as rolling elements, and the wheels are repeatedly rolled on the rails. Although the rolling fatigue test device for performing the fatigue test on one or both of the wheels and the rails has been described, the present invention is not limited to this, and other rolling fatigue test devices, for example, a tire running body such as an automobile as a wheel. In addition to using the tire to be used, as the rolling element, use a paving member having asphalt pavement, etc., or a tire running member such as a concrete floor plate or steel floor plate, and repeatedly roll the tire on the paving member etc. The rolling fatigue test apparatus may be used for examining the behavior such as wear or damage of one or both of the tire and the pavement member.

Further, in the above embodiment, as an example of the control method, a CPU (not shown) in the controller 41 outputs a digital drive control signal, and the digital drive control signal is supplied to the D / D in the controller 41. Converted into an analog drive control signal by an A converter (not shown),
The example in which the servo valve (not shown) amplifies and outputs to the control valve (not shown) to control the control valve has been described, but the present invention is not limited to this, and other control such as A CPU (not shown) in the controller 41 may output a digital drive control signal, and the digital drive control signal may directly control the control valve (not shown). In this case, a digital control type valve is used as the control valve, and the D / A converter is unnecessary.

In the above embodiment, the vertical driving means (for example, the vertical driving section 2) for vertically driving the wheel (for example, the wheel test piece W) and the driven body (for example, the rail test piece R) are set in the horizontal direction. A rolling fatigue testing device (for example, rolling fatigue testing device 100) equipped with a horizontal driving means (for example, the horizontal driving portion 3) that is driven by the Although described by way of example, the present invention is not limited to this, and since the actuators and the like of the electrohydraulic servo mechanism described above have a high degree of freedom in their arrangement and control, devices of other configurations can also be realized. For example, a horizontal drive unit (for example, a horizontal drive unit that can be driven in a horizontal direction (for example, a horizontal direction perpendicular to the extending direction of the rail test piece R)) on the wheel (for example, the wheel test piece W).
The above-mentioned actuator of the electro-hydraulic servo mechanism or the like) may be provided to more accurately reproduce the actual condition of the vehicle during traveling. Alternatively, a horizontal drive means (for example, the electrohydraulic servo mechanism described above) that can be driven in a direction (eg, a horizontal direction perpendicular to the extending direction of the rail sample R) at a right angle to the rolling element (for example, the rail sample R). (Actuator, etc.) may be provided to more accurately reproduce the actual condition of the vehicle during traveling. Alternatively, both the wheel (for example, the wheel test piece W) and the driven body (for example, the rail test piece R) can be further driven in the horizontal direction (for example, the horizontal direction perpendicular to the extending direction of the rail test piece R). Horizontal driving means (for example, an actuator of the above-mentioned electro-hydraulic servo mechanism or the like) may be provided to more accurately reproduce the actual condition of the vehicle during traveling.

Further, in the above embodiment, the horizontal driving means (for example, the horizontal driving section 3) for horizontally driving the rolling element (for example, the rail test piece R) gives the rolling element a repetitive horizontal motion. Although the example configured as described above has been described, the horizontal driving in the present invention is not limited to this, and horizontal driving in another sense is also included. For example, the rolling element is formed in an annular shape, and the wheel (for example, the wheel test piece W) is placed at a position which is the upper end of the outer peripheral surface of the substantially cylindrical surface of the rolling element, and the wheel is repeatedly repeated in the vertical direction. A vertical drive means (for example, a vertical drive part 2) for driving to apply a load is attached, and the driven body is rotationally driven by the rotation drive means (for example, a hydraulic motor or an electric motor) with the center of the circle as a rotation center. Also, horizontal driving in the case of rolling on a rolling element while applying a vertical repeated load to the wheel is included. In this case, at the position where the wheel is in contact with the rolling element (for example, at the upper end of the outer peripheral surface of the annular rolling element), the rolling element is horizontal to the wheel. Will move in only one direction, not in the reciprocating direction.

[0064]

As described above, according to the present invention,
The wheel specimen (W) is moved vertically by hydraulic pressure or oil flow rate.
Vertical drive means (2) that drives the
Horizontal drive for horizontally driving the rail test piece (R)
The moving means (3) and the vertical driving means (2).
Applied by the vertical force and the horizontal drive means (3)
Force detecting means (43V, 43H) for detecting the horizontal force,
Hanging the wheel specimen (W) and the rail specimen (R)
Displacement detection means (44V, for detecting direct displacement and horizontal displacement)
44H) and detection of the force detection means (43V, 43H)
Force and detection of the displacement detection means (44V, 44H)
The vertical drive means (2) and the horizontal drive based on the displacement
Electric servo control of hydraulic pressure or oil flow rate in moving means (3)
The control means (41, 42) for
1, 42) are load or load in the vertical drive means (2).
Is the displacement and the load on the horizontal drive means (3) or
Displacement is controlled and the wheel specimen (W) is connected to the rail joint.
Only when it comes to the top, let the vertical force act,
The vertical force waveform makes the forward and backward speeds of the triangular waveform faster.
Impulse-like or spikes with reduced turn-around time
Since was set to be Jo shock wave, it is possible to finely control the load and displacement, and rail cars both wheels, rails
There is an advantage that the fatigue characteristics of the rail joint can be accurately examined. It also has the advantage that the noise and vibration during the test are low and the test environment is good.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a rolling fatigue test apparatus according to an embodiment of the present invention, FIG. 1 (A) is a front view, and FIG.
(B) has shown the side view, respectively.

FIG. 2 is a block diagram showing a configuration relating to control of the rolling fatigue test apparatus shown in FIG.

FIG. 3 is a diagram showing a configuration of a conventional rolling fatigue test apparatus, FIG. 3 (A) is a rear view, and FIG. 3 (B) is a side view.

[Explanation of symbols]

1 frame 2 Vertical drive 3 Horizontal drive 4 control unit 5 frames 6 Vertical drive 7 Horizontal drive 8 Sliding adjustment section 11 bottom plate 12 Column members 13 Beam members 14 Plate-shaped member 21 Vertical hydraulic actuator 21P piston 22 Vertical drive member 23 wheel axle 31 Horizontal hydraulic actuator 31P piston 32 Horizontal drive member 33 Rail support member 34 Sleeper-like members 35 Rail fixture 36 Sliding member 41 controller 42 Electro-hydraulic servo mechanism 42C hydraulic piping circuit 43H Horizontal load detector 43V vertical load detector 44H Horizontal displacement detector 44V vertical displacement detector 45 ROM 46 RAM 47 Input operation section 48 display 51 bottom plate 52 Columnar member 53 Beam members 54 Shaft support member 61 hydraulic cylinder 61P piston 62 Vertical drive member 64 Connection member 65 Tension member 71 electric motor 71D drive shaft 72 belt car 73 belt 74 belt car 75,76 gears 77 Crank rod 78 Horizontal drive member 79 running wheels 80 pieces for adjustment 81 Top engaging part 100,200 Rolling fatigue test equipment A, B, C Hinge fulcrum R rail specimen W wheel specimen

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Noriji Abe, 8-8, Komitsu-cho, Kokubunji, Tokyo 38 Inside the Railway Technical Research Institute (72) Inventor, Mitsumasa Tatsumi 2-chome, Komibun-cho, Kokubunji, Tokyo 8 Address 38 Inside the Railway Technical Research Institute (72) Inventor Kenichi Takao 2-8, Hikarimachi, Kokubunji-shi, Tokyo 38 Inside the Railway Technical Research Institute (72) Inventor Jun Horikawa Nishinokyo Kuwabara, Nakagyo-ku, Kyoto-shi, Kyoto Prefecture No. 1 town Shimadzu Corporation Sanjo Factory (56) Reference JP 63-198848 (JP, A) JP 63-198847 (JP, A) JP 58-144730 (JP, A) JP 61-64373 (JP, A) JP-A-9-26382 (JP, A) JP-A-53-26001 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01M 17 / 10 G01N 3/56

Claims (2)

(57) [Claims] 1. A wheel specimen (W) which is a wheel for a railway vehicle.
Rolling on the rail specimen (R) with rail seams
The wheel test piece (W) and the rail test piece are
Fatigue test of either or both of the specimen (R)
A rolling fatigue test apparatus (100) for performing the wheel test specimen (W) in a vertical direction by hydraulic pressure or oil flow rate.
Vertical drive means (2) for driving the rail test piece (R) horizontally by hydraulic pressure or oil flow rate.
A horizontal driving means (3) for driving in the direction, and a vertical force applied by the vertical driving means (2) and the front
The horizontal force applied by the horizontal drive means (3) is detected.
Force detecting means (43V, 43H) and the suspension of the wheel specimen (W) and the rail specimen (R).
Displacement detection means (44V, for detecting direct displacement and horizontal displacement)
44H) and the force detected by the force detection means (43V, 43H) and the front
Based on the displacement detected by the displacement detection means (44V, 44H)
Based on the above, the vertical drive means (2) and the horizontal drive means (3)
Means for electric servo control of hydraulic pressure or oil flow rate in
(41, 42), wherein the control means (41, 42) is the vertical drive means.
Load or displacement in (2), and the horizontal drive means
The wheel specimen is controlled by controlling the load or displacement in (3).
Only when (W) is on the rail joint, the vertical force is applied.
And the waveform of the vertical force is a triangular waveform.
Higher forward and return speeds and shorter round trip time
A rolling fatigue test apparatus, characterized in that it has an impulse-shaped or spike-shaped impact waveform . 2. A wheel specimen (W) which is a wheel for a railway vehicle.
Rolling on the rail specimen (R) with rail seams
The wheel test piece (W) and the rail test piece are
Fatigue test of either or both of the specimen (R)
A rolling fatigue test method to be performed, wherein the wheel test piece (W) is vertically moved by hydraulic pressure or oil flow rate.
Vertical drive means (2) for driving the rail test piece (R) horizontally by hydraulic pressure or oil flow rate.
A horizontal driving means (3) for driving in the direction, and a vertical force applied by the vertical driving means (2) and the front
The horizontal force applied by the horizontal drive means (3) is detected.
Force detecting means (43V, 43H) and the suspension of the wheel specimen (W) and the rail specimen (R).
Displacement detection means (44V, for detecting direct displacement and horizontal displacement)
44H) and the force detected by the force detection means (43V, 43H) and the front
Based on the displacement detected by the displacement detection means (44V, 44H)
Based on the above, the vertical drive means (2) and the horizontal drive means (3)
Means for electric servo control of hydraulic pressure or oil flow rate in
A rolling fatigue test device (100) equipped with (41, 42)
By using the control means (41, 42), the vertical drive means
Load or displacement in (2), and the horizontal drive means
The wheel specimen is controlled by controlling the load or displacement in (3).
Only when (W) is on the rail joint, the vertical force is applied.
And the waveform of the vertical force is a triangular waveform.
Higher forward and return speeds and shorter round trip time
Impulse or spike-like shock waveform
A rolling fatigue test method characterized by the above.