JPH11142265A - Instrument for measuring load of tire contact area - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a compact, highly reliable measuring apparatus that can measure a dynamic load of three components of force quantitatively with high responsivity, by detecting, recording with time the dynamic load of three components of force of a contact area via a pressure-sensitive part, a sensor main body and each strain gauge. SOLUTION: A strain gauge 21 detects a load in a perpendicular direction, a strain gauge 22 detects a load in a breadthwise direction, a strain gauge 23 detects a load in a running direction of a tire and a strain amplifier 13 amplifies output signals of the strain gauges 21, 22, 23. An interference force correction-operating device 14 operates an interference correction of signals when receiving input signals from the strain amplifier 13, separates the signals to a perpendicular load signal 15, a running direction load signal 17, a breadthwise direction load signal 16 and outputs the signals. A recorder 18 records the signals with time. In consequence, a dynamic load of three components of force generated at a contact area of the vehicle tire to a road face can be measured quantitatively independently, enabling quantitative detection of a contact characteristic of the vehicle tire which contributes to improvement on performance of the tire. The contact characteristic can be detected compactly with high responsivity and high reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle tire running on a road surface, which is generated on a ground contact surface in a running direction, a vertical direction and a widthwise direction of the vehicle tire which is orthogonal to both directions (hereinafter simply referred to as width direction). The present invention relates to a tire contact surface load measuring device capable of quantitatively measuring a three-component load, which is a typical contact load.

[0002]

2. Description of the Related Art As a conventional apparatus for measuring a ground contact load of a vehicle tire, a ground contact load is measured by using a change in resistance value which changes according to the pressure of a pressure-sensitive conductive rubber shown in FIG. A pressure-sensitive conductive rubber type grounding surface load measuring device, or a pressure-sensitive film type connection device that measures a grounding load using a color and a density change that change according to the pressure applied to the pressure-sensitive film shown in FIG. There is a ground load measuring device.

Among them, the pressure-sensitive conductive rubber type ground contact surface load measuring device has a characteristic shown in FIG. 6 (b) when the weight body 2 passes over the pressure-sensitive conductive rubber body as shown in FIG. 6 (a). As shown in the table, the pressure-sensitive conductive rubber characteristic 3 in which the resistance value Ω changes according to the size of the weight W of the weight body 2 is used. However, in such a device, as shown by the pressure-sensitive conductive rubber characteristic 3 in this characteristic table, the sensitivity of the weight body 2 to the vertical load, which is the grounding load, is extremely large, and when the weight body 2 passes, the sharp change occurs. Therefore, it is inappropriate to measure the vertical load continuously and quantitatively.

In the pressure-sensitive film-type ground contact surface load measuring device, when the weight body 2 passes above the pressure-sensitive portions 5 arranged at equal pitches on the pressure-sensitive film 4, the discoloration pressure-sensitive The qualitative change of the vertical load, which is the ground contact load of the weight body 2 that has passed from the color of the portion 6 and the density thereof, is visually determined based on the color and density of the discoloring pressure-sensitive portion 6. Compared to the piezo-electric rubber type ground contact load measuring device, the change in the vertical load of the passing weight body can be grasped though it is qualitative.

However, this pressure-sensitive film-type ground contact load measuring device can measure only the vertical load among the ground loads of the weight body 2 passing through in the same manner as the pressure-sensitive conductive rubber contact surface load measuring device. As described above, the measurable vertical load can be measured only qualitatively. As described above, the conventionally used tire tread surface load measuring device can measure only the vertical load among the tread loads applied to the tire tread surface, and the measured vertical load also determines the magnitude of the load. However, even if it could be discriminated, the size could not be quantitatively measured.

On the other hand, the vehicle performs "run,""stop," and "bend" operations by contacting the vehicle tires with the road surface, and the rolling characteristics of the vehicle, such as rolling resistance, wet maneuverability, and cornering, are characteristics of the vehicle. The characteristics and the like may be said to be greatly affected by the grounding load, which is the grounding surface shape and the surface pressure of the grounding surface, and also the vertical load, the running direction load, and the width direction load. Also, irregularities due to the tread pattern are usually formed on the surface of the vehicle tire, and this small tread block may be deformed during running, causing complicated sliding, and may be perpendicular to a small section of the contact surface of the vehicle tire. In addition to the load, forces such as a load in the traveling direction and a load in the width direction act.

[0007] Accordingly, it is necessary to accurately measure these contact loads applied to the contact surface of the running vehicle tire.
This greatly contributes to improving the performance of vehicle tires and, in turn, to improving the running performance of vehicles.

[0008]

As described above, a so-called three-component force consisting of a vertical load, a running direction load, and a width direction load applied to a contact surface between a running vehicle tire and a road surface has been described above. There is no tire tread surface load measuring device that can quantitatively measure the load and dynamic three-component load, and accurately measures the dynamic three-component load applied to the tread surface of a running vehicle tire. As a result, it was not possible to obtain data capable of dramatically improving the performance of vehicle tires.

The present invention is intended to solve the problems caused by the inability to measure with the conventional tire contact surface load measuring device. (1) Three-component force generated on the contact surface between the vehicle tire and the road surface The load can be measured independently and quantitatively,
(2) As in the tread block portion, the size can be reduced so that the behavior of a small block having a small section of the ground contact surface can be measured. (3)
The tire contact can be made highly responsive so that it can measure the three-component load applied to the ground contact surface during high-speed running of the vehicle. (4) Furthermore, the tire contact can be made highly durable and highly reproducible. It is an object to provide a ground load measuring device.

[0010]

For this reason, the tire contact surface load measuring device of the present invention has the following means.

(1) The top surface is exposed on the road surface so as to be in contact with the ground surface of a vehicle tire for measuring the ground load, which is loaded by the ground contact with the road surface during running of the vehicle. A pressure-sensitive portion for transmitting a ground load applied to the ground surface at the time is provided.

The pressure-sensitive part is attached to the top of a sensor body, which will be described later, with a screw, so that the height can be adjusted by turning the screw. Thus, under test conditions such as straight running, turning, and cornering of a running vehicle, It is preferable that measurement conditions suitable for the running state of the running vehicle can be established so that the contact surface of the vehicle tire is brought into contact with the test conditions.

(2) The pressure-sensitive portion is fixed to the top portion, and is vertically embedded in an installation section provided inside the sensor mounting base plate forming the road surface, and is fixed to the top portion. A solid cylindrical sensor main body is provided so as to be deformed in response to a ground load which is applied and transmitted from the pressure-sensitive portion.

When the sensor main body is embedded in the sensor mounting base plate, the downstream portion of the sensor main body is fixed to and fixed to the sensor mounting base plate, and the parts other than the lower end part are loaded on the pressure-sensitive part to be sensitive. According to the direction of the ground load transmitted from the pressure portion, the outer periphery of the sensor body is filled with an elastic coating agent or the like so that the sensor body can be deformed, so that the sensor body can be freely deformed. It is preferable that a gap provided between the sensor main body and the sensor mounting base plate caused by the installation is sealed off by taking measures to excel in waterproofing and constant temperature so that an all-weather type and stable operation for a long time can be ensured.

The sensor body has a diameter of about 6 mm and a length of about 48 mm from the allowable stress limit and the natural frequency limit value obtained from the applied grounding load, and has a dense detection arrangement. For this reason, the fixing of the lower end of the sensor main body to the sensor mounting base plate is fixed by screw type, and it is arranged so that the ground load can be measured at intervals of about 10 mm in the width direction of the road surface formed on the sensor mounting base plate. Preferably, it is possible.

(3) A vertical load, which is disposed on the side of the sensor body and is applied to the grounding surface due to vertical deformation of the sensor body, is applied to the grounding surface due to deformation of the sensor body in the running direction. Load detectors for detecting a three-component load consisting of a width direction load among the ground loads applied to the ground surface due to the widthwise deformation of the sensor main body due to the widthwise deformation of the sensor body.

In the load detector, the vertical load of the ground contact load, the compressive strain of the sensor body caused by the load applied to the sensor body from above, the load in the running direction, and the load in the tire width direction are measured from the side. A high-sensitivity semiconductor strain gauge is used to measure the amount of bending strain of the sensor body caused by the load applied to the sensor body. It is preferable to use a general foil-shaped strain gauge as a strain gauge for detecting a relatively large bending strain, which generates a relatively large amount of strain.

In the load detector for detecting the three-component load, a strain amplifier for amplifying the deformation signal is provided because the deformation signal of the sensor body output from the strain gauge is very small. For the interference component between the vertical load and the bending load that occurs when the deformation of the main body is detected, perform the circuit correction by attaching the strain gauge and perform the calibration in advance.
It is preferable that an interference correction coefficient is obtained, and the interference force correction arithmetic device performs arithmetic processing so that the three component force loads can be separately and independently detected.

(4) A recorder for recording the three-component force generated on the ground contact surface output from the load detector over time is provided.

The tire tread surface load measuring device of the present invention can have the characteristics (1) to (4) shown in the problem to be solved by the invention by the above-mentioned means. The so-called three-component load and the dynamic three-component load of the vertical load, running direction load and width direction load applied to the ground contact surface with the road surface of the tire for use can be quantitatively measured. It can be used as a tire contact surface load measuring device, which can accurately measure the three-component load applied to the contact surface of a running vehicle tire, and data that can greatly contribute to the improvement of the vehicle tire performance. Will be obtained.

The sensor body has a diameter of 6 mm and a length of 48 mm.
In order to make the detection arrangement dense, the mounting fixation to the sensor mounting base plate is screw-type fixing, and it can be arranged so that the grounding load can be measured at intervals of about 10 mm in the width direction of the road surface, Approximately 10mm to the contact surface of the vehicle tire
Can detect the three-component load of the small block part, and high-density data can be obtained, which can contribute to the design of vehicle tires that excel in straight ahead, rolling, cornering, etc. Excellent vehicles can be realized.

Further, the natural frequency of the sensor body is also 2 KHz.
With the above, a running test of 100 km / H or more can be performed, and even in such a running test, the dynamic behavior of the ground contact surface becomes clear, which can contribute to the design of a vehicle tire having excellent running stability.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the tire tread surface load measuring device of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an overall configuration of a load detector and a recorder showing a first embodiment of a tire contact surface load measuring device of the present invention.

In the drawing, 21 is a strain gauge for detecting a vertical load, 22 is a strain gauge for detecting a load in a width direction, and 2
Reference numeral 3 denotes a strain gauge for detecting a load in the tire running direction, 13 denotes a strain amplifier for amplifying an output signal from each of the strain gauges 21, 22, and 23, and 14 denotes an input of each signal from the strain amplifier 13 and interference between the signals. After performing the correction operation,
This is an interference force correction arithmetic unit that separates and outputs a vertical load signal 15, a running direction load signal 17, and a width direction load signal 16. The load detector is the above strain amplifier 1
3. Interference correction arithmetic unit 14 and strain gauge 2
1, 22, and 23.

Reference numeral 18 denotes a recorder which records a vertical load signal 15, a running direction load signal 17 and a width direction load signal 16 output from the interference force correction arithmetic unit 14 over time.

Next, FIG. 2 is a side view showing a sensor 10 for detecting a ground contact load of a running vehicle.

In FIG. 2, reference numeral 20 denotes a sensor body having a diameter of 6;
It is formed of a solid cylindrical body having a length of about 48 mm and a length of about 48 mm, and each of the above-mentioned strain gauges is attached on the circumference. That is, a vertical load detecting strain gauge 21 for detecting a vertical load having a small amount of compressive strain generated in the sensor body 20.
In order to increase the sensitivity, a semiconductor strain gauge is used to increase the sensitivity. When the sensor body 20 is mounted on the sensor mounting base plate 30, a direction perpendicular to the direction in which the bending load occurs in the running direction, that is, the so-called width direction sensor body is used. On the side of 20, 1
Two sheets are stuck symmetrically at 80 °.

The vertical load detecting strain gauge 21
On the side surface in the width direction of the sensor body 20 in the same direction, which is affixed to the same direction, a strain gauge 22 for detecting the width direction load is similarly provided.
Two sheets are stuck symmetrically at 0 °. Further, the sensor body 2
The traveling direction 0, that is, the front and rear side surfaces of the sensor body 20 are respectively attached with traveling direction load detecting strain gauges 23.

The strain gauge 23 for detecting the load in the running direction and the strain gauge 22 for detecting the width direction are provided with a general foil strain for detecting a relatively large load in the running direction and a load in the width direction. A gauge is used, and as is clear from the above description, since the directions of the loads detected by the respective gauges differ by 90 °, they are attached to the side surface of the sensor main body 20 with the directions changed by 90 °.

Each of these strain gauges 21, 2
Each of the wires 2 and 23 is provided with a conducting wire 26 for transmitting an electric signal corresponding to the detected strain amount to each of the above-described strain amplifiers 13.

Reference numeral 24 denotes a screw protruding from the bottom surface of the sensor main body 2 so that the height can be adjusted by the pressure-sensitive portion.
The height of the pressure-sensitive part 24 is adjusted by turning the screw.
Under test conditions such as straight running, turning, and cornering of a running vehicle passing through the top surface of the vehicle, measurement conditions suitable for the running state of the running vehicle can be established such that the contact surface of the vehicle tire comes into contact according to the test conditions. Like that. Also, 2
Reference numeral 5 denotes a screw groove provided at the lower end of the sensor main body 20 for fixing the lower end of the sensor main body 20 to the sensor mounting base plate 30.

Next, FIG. 3 is a view showing a state in which a sensor 10 is installed on a road surface on which a vehicle for detecting a ground contact load travels.
3 (a) is a plan view, and FIG. 3 (b) is an arrow A in FIG. 3 (a).
It is a cross section in -A.

In the figure, 30 is buried on the running road surface,
A sensor mounting base plate provided with an installation section 29 for installing the sensor 10 therein is fixed to the sensor mounting base plate 31 by being screwed into a screw groove 25 provided at a lower end portion of the main body 10. The mounting screws 32 are provided with a coating agent poured into a gap between the sensor main body 20 and the sensor mounting base plate 30 installed in the installation section 25 having a larger cross-sectional area than the sensor main body 20 to perform waterproofing and heat retaining functions. The main body 20 is formed of an elastic material so as not to prevent the strain deformation.

As described above, when the sensor main body 20 is embedded in the sensor mounting base plate 30, the lower end of the sensor main body 20 is fixed to the sensor mounting base plate 30 by the fixing mounting screws 31,
The elastic material is fixed so that the portion other than the lower end portion of the sensor body 20 is applied to the pressure-sensitive portion 24 by the ground load of the vehicle tire passing therethrough and can be deformed in the direction of the ground load transmitted from the pressure-sensitive portion 24. The outer periphery of the sensor main body 20 is filled with the coating agent 32 or the like so that the sensor main body 20 can be freely deformed, and is provided between the sensor main body 20 and the sensor mounting base plate 30 generated by the installation of the sensor main body 20. The gap is sealed with measures to excel in waterproofing and constant temperature, ensuring that all weather and long-term stable operation can be ensured.

The sensor body 20 has a diameter of 6 mm and a length of 48 mm based on the allowable stress limit and the natural frequency limit value obtained from the grounding load applied to the pressure-sensitive portion 24, and has a close detection arrangement. For this purpose, the lower end of the sensor main body 20 is fixed to the sensor mounting base plate 30 with the fixing mounting screws 31 and is arranged at intervals of about 10 mm in the width direction of the sensor mounting base plate 30 as shown in FIG. The contact load can be measured densely.

FIG. 4 is a diagram showing the test data of each strain gauge described above. In each figure, the horizontal axis indicates the applied load, and the vertical axis indicates the output of the strain amplifier 13.

Z indicates a signal from the vertical load detecting strain gauge 21 when an applied load is applied to the sensor body 20 to which each strain gauge is attached, and X indicates a signal from the width direction load detecting strain gauge 22. And Y indicates a signal of the traveling direction load detecting strain gauge 23, respectively.

FIG. 4A shows the relationship between signals Z, X, and Y of each strain gauge when a vertical load is applied to the sensor body 20 to which each strain gauge is attached.
The signal of the strain gauge 22 for detecting the load in the width direction and the signal of the strain gauge 23 for detecting the load in the running direction when a vertical load is applied are both 0, and the vertical load interferes with the bending force of the sensor body. Indicates that there is no

FIG. 4B shows the signal Z of the vertical load detecting strain gauge 21 when the running direction load is applied to the sensor body 20 and the width direction load detecting strain gauge. 22 shows that the sensor body 20 does not interfere with the vertical force due to the bending load in the running direction and the bending force in the width direction.

FIG. 4C shows the relationship between the signal Z of the strain gauge 21 for detecting the vertical load and the signal Y of the strain gauge 23 for detecting the load in the running direction when a bending load in the width direction is applied to the sensor body 20. The output relation is shown. Here, when a bending load in the width direction is applied, the signal Z of the strain gauge for vertical load detection is also output, which indicates that the bending load in the width direction interferes with the vertical load.

Next, a waveform diagram showing the results of measuring the three-component load on the contact surface of the vehicle tire in the vehicle running test. That is, the waveforms shown in the figure show the three-component load signals output from the interference force correction arithmetic unit 14 shown in FIG. 1, that is, the vertical load signal 15, the width direction load signal 16, and the traveling direction load signal 17. .

As described above, in the tire tread surface load measuring device according to the present embodiment, the sensor body 20 includes the vertical load, the traveling direction load, and the width applied to the tread surface of the vehicle tire when the actual vehicle is running. In order to satisfy the required specifications such as minimizing and arranging as much as possible due to the natural frequency of the main body and the need for multi-point measurement, which determine the applied load force consisting of directional loads and dynamic response, the maximum strain within the allowable stress Designed to generate volume. As a result, the sensor body 20 had a solid cylindrical structure having a diameter of about 6 mm and a length of about 48 mm.

Then, two vertical load detecting strain gauges 21 are attached to the upper part of the circumference of the sensor body 20 symmetrically at 180 °, and the load in the running direction and the width direction, that is, the measurement of the so-called bending load is used. A strain gauge 22 for detecting the load in the width direction and a strain gauge 23 for detecting the running load are placed on both sides and on the side surfaces of the front and rear portions in a place near the support fixing part at the lower part of the cylinder, that is, a place where a large bending strain occurs.
It was affixed with 80 ° symmetry.

The vertical load detecting strain gauge 21
Are the so-called bending load detecting strain gauges 22 and 2 because the amount of generated strain is smaller than the limit of allowable stress.
A semiconductor strain gauge having a sensitivity 100 times or more higher than that of the foil gauge used in No. 3 was used.
Furthermore, the detection of the load in the running direction and the load in the width direction is affixed near the fixed support portion at the lower portion of the sensor main body 20 where the maximum amount of bending strain is generated.

Note that the strain gauge 2 for detecting the load in the width direction is used.
2 is attached to the same circumferential position as the semiconductor strain gauge 21 for detecting a vertical load, that is, to both sides perpendicular to the running direction V. After the attachment of the strain gauges 21, 22, and 23, a known load was applied to the sensor main body 20, and the test of the strain gauges 21, 22, and 23 was performed. In the test of each of the strain gauges 21, 22, and 23, a vertical load, a load in the running direction, and a load in the tire width direction are applied, respectively, and the output signal characteristics of each of the strain gauges 21, 22, and 23 are grasped. Was determined.

As a result of the test, it was found that it was necessary to correct the load in the width direction with respect to the output signal Z of the strain gauge for detecting a vertical load.

[0048]

(Equation 1)

As described above, the signal Z _o from the strain gauge 21 for detecting a vertical load and the signal X from the strain gauge 22 for detecting a load in the width direction, which are measured by the verification, are expressed by the following equation (1).
By obtaining a correction coefficient in the above, the set value is given to the interference correction calculation device 14, and the correction calculation is performed, so that the output signals Z, X, and Y from the respective strain gauges are obtained by removing the interference components. , Is input to the recorder 18 as a true three-component load component signal.

Also, depending on the accuracy of attaching the strain gauge,
If there is also interference between the signal Y of the strain gauge for detecting the load in the traveling direction and the signal Z of the strain gauge for detecting the vertical load, change Equation 1 to Equation 2 and obtain the value. And the correction operation may be performed.

[0051]

(Equation 2)

In this way, the interference force correction calculation device 14 calculates, outputs, and records the data.

FIG. 5 shows the result of a running test performed on an actual vehicle. According to FIG.
4 indicates the vertical load when passing over the vehicle, the width direction load signal 16 indicates that a load directed to the outside of the vehicle tire is acting on the ground contact surface, and the running direction load signal 17 indicates that the tire is on the road surface. Grip to zero just above and finally kick. The data shown in FIG. 5 shows typical pattern waveforms reproduced by performing several running tests.

[0054]

As described above, according to the tire tread surface load measuring device of the present invention, the tread surface of the vehicular tire for measuring the tread load applied by the top surface to the road surface when the vehicle is running. A pressure-sensitive part, which is disposed on the road surface so as to be in contact with the vehicle and transmits a ground load applied to the ground surface when the vehicle is traveling, and a pressure-sensitive part is fixed to the top part, and a sensor forming the road surface A solid that is buried vertically in the installation section provided on a part of the mounting base plate, is loaded on the pressure-sensitive part fixed to the top, and can be deformed according to the ground load transmitted from the pressure-sensitive part. A cylindrical sensor main body, which is disposed on the side of the sensor main body, is a vertical load of the ground load applied to the ground plane due to the vertical deformation of the sensor main body, and is applied to the ground plane from the deformation of the sensor main body in the traveling direction. Running load of the ground load And a load detector that detects a three-component load consisting of a load in the width direction among the ground loads applied to the ground surface due to the deformation of the sensor body in the width direction, and a load detector that detects the load on the ground surface that is output from the load detector. By providing a recorder that records the component load over time, the following operations and effects can be obtained.

(1) It is possible to quantitatively and independently measure the three-component load generated on the contact surface between the vehicle tire and the road surface, and to quantitatively grasp the contact characteristics of the vehicle tire, thereby contributing to the improvement of tire performance. (2) By actually measuring the mutual interference characteristics between the three-minute loads by a preliminary test and performing a correction process, the three-minute force loads can be separated and measured in real time, thereby improving the measurement accuracy and increasing the speed when the vehicle is running at high speed. High responsiveness that can measure 3 component load applied to the ground contact surface,
(3) By arranging a plurality of sensors densely on the base plate, it is possible to accurately grasp a dynamic contact pressure load distribution state during traveling, and a small block having a small section of a contact surface such as a tread block portion. (4) It can be realized with an inexpensive sensor and system configuration, and can be made highly durable, reproducible and highly reliable.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a load detector and a recorder, showing a first embodiment of a tire tread surface load measuring device of the present invention;

FIG. 2 is a side view partially showing a sensor for detecting a ground contact load applied to a vehicle tire ground contact surface of a traveling vehicle,

3A and 3B are diagrams showing a state in which a sensor 10 is installed on a road surface on which a vehicle travels. FIG. 3A is a plan view, and FIG.
Sectional view in the direction of arrows AA shown in (a),

4A and 4B are diagrams showing verification data of a strain gauge for detecting a ground contact load. FIG. 4A is a diagram showing output signal data of a strain amplifier in a state where a vertical load is applied to a sensor body, and FIG. 4B. FIG. 4C is a diagram showing output signal data of the strain amplifier in a state where a load in the running direction is applied, and FIG. 4C is a diagram showing output signal data of the strain amplifier in a state where a load in the width direction is applied.

FIG. 5 is a diagram showing an example of a ground contact load signal when the vehicle is actually running. FIG. 5A shows a vertical load signal applied to a contact surface;
FIG. 5B shows a width direction load signal, FIG. 5C shows a running direction load signal,

FIG. 6 is a diagram showing a pressure-sensitive rubber type contact surface load measuring device as an example of a conventional tire contact surface load measuring device.
FIG. 6A is a cross-sectional view, and FIG.

FIG. 7 is a plan view of a pressure-sensitive film type contact surface load measuring device as another example of the conventional tire contact surface load measuring device;
FIG. 7A is a diagram illustrating a state of passing the weight body, and FIG. 7B is a diagram illustrating a state after passing the weight body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressure-sensitive conductive rubber body 2 Weight body 3 Pressure-sensitive conductive rubber characteristic 4 Pressure-sensitive film 5 Pressure-sensitive part 6 Discoloration pressure-sensitive part 10 Sensor 13 Strain amplifier 14 Interference force correction arithmetic unit 15 Vertical load signal 16 Width load signal 17 Running Direction load signal 20 Sensor main body 21 Strain gauge for detecting vertical load 22 Strain gauge for detecting width direction load 23 Strain gauge for detecting load in running direction 24 Pressure sensing part 25 Screw groove 29 Installation section 30 Sensor mounting base plate 31 Fixed mounting screw 32 Coating Agent W Weight of body Ω Resistance value X Signal of strain gauge for detecting load in width direction Y Signal of strain gauge for detecting load in running direction Z Signal of strain gauge for detecting vertical load V Running direction

Claims (1)

[Claims] 1. A tire contact surface load measuring device for measuring a contact load of a vehicle tire applied to a contact surface by contact with a road surface during running, wherein a top surface is disposed so as to contact the contact surface. A pressure-sensitive portion to which the ground load is transmitted;
A solid cylindrical sensor main body fixed to the top portion and vertically embedded in the sensor mounting base plate and deformed in response to the ground load transmitted from the pressure sensitive portion; and the sensor A load detector arranged on a side portion of the main body, for detecting a three-component load composed of the vertical load applied to the ground contact surface from the deformation of the sensor main body, the traveling load, and the ground load in the width direction; And a recorder for recording the three-component load output from the load detector over time.