JP2010032263A - Ground contact load distribution detecting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ground contact load distribution detecting apparatus capable of detecting a distribution of ground contact load of tires in which lateral loads, forward and backward loads, and rotational moment are inputted. <P>SOLUTION: The ground contact load distribution detecting apparatus includes both a mounting seating 10c higher than a detection part 2a in the periphery of the detection part 2a of a sensor sheet 2 mounted to a plane of a top plate 10b of a mounting base 10 and a carbon plate 3 for covering the detection part 2a in such a way as to be held between the mounting seating 10c and a frame 4. A tire is pressed to the detection part 2a via the carbon plate 3 to prevent lateral loads, forward and backward loads, and rotational moment, which are inputted to the tire, from being inputted to the detection part 2a as horizontal loads. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a contact load distribution detection device that mainly detects a contact load distribution of a vehicle tire.

  The distribution of contact load when the tire provided on the vehicle contacts the road surface is a large factor that affects the riding comfort and steering stability of the vehicle. Therefore, in order to design tires and suspensions (suspension devices) that improve the riding comfort and handling stability of the vehicle, a measuring device that suitably measures the contact load distribution of the tires is required.

Conventionally, as such a measuring device, a tire is placed on a film in which microcapsules encapsulating a color former are laminated, and the contact load distribution of the tire is detected by the distribution of the color former leaking from the microcapsules that are destroyed by the static load of the tire. There is a detection device.
In addition, for example, Patent Document 1 discloses a detection device that is equipped with an installation base that can move a film in a horizontal direction, and that can accurately detect a ground contact load distribution of the tire by suppressing a side slip that occurs when the tire contacts the film. Is disclosed.

However, in order to further improve the ride comfort and handling stability of the vehicle, for example, it is necessary to detect the contact load distribution of the tire turning by the steering operation and the contact load distribution of the tire in the vehicle traveling while receiving the lateral load. There is.
In this case, it is necessary to detect a change in the ground load distribution when a lateral load is input to the tire placed on the film. However, since the film does not have resistance against the load in the horizontal direction, it is input to the tire. When the lateral load is input to the film as a horizontal load, there is a problem that the film is damaged.
JP 2006-047251 A

  Accordingly, an object of the present invention is to provide a contact load distribution detection device capable of detecting a contact load distribution of a tire to which a lateral load, a longitudinal load, and a tire turning moment (turning moment) are input.

  In order to solve the above-mentioned problem, the present invention is a ground load distribution detecting device including a sensor sheet for detecting a ground load distribution of a tire, wherein a protective plate is interposed between the tire and the sensor sheet. did.

  According to this invention, a protective plate can be interposed between a tire and a sensor sheet, and it can prevent that a tire and a sensor sheet contact directly. Therefore, even when a lateral load, a longitudinal load, or a turning moment is input to the tire, it is possible to prevent the sensor sheet from being applied with a horizontal load by sliding on the protective plate.

  Further, the present invention is characterized in that the sensor sheet includes a detection unit including a flat surface covered with the protection plate, and detects a contact load distribution of the tire pressed against the detection unit via the protection plate. It was.

  According to the present invention, the planar detection portion provided in the sensor sheet can be covered with the protective plate. Therefore, it can prevent that a detection part and a tire contact directly.

  Further, according to the present invention, a clearance is provided between the protection plate and the detection unit to prevent mutual contact, and the tire formed on the protection plate when the tire is pressed against the protection plate. An area of the ground plane is pressed against the detection unit.

According to the present invention, a clearance can be provided between the protective plate and the detection unit. Furthermore, when the tire is pressed against the protective plate, the area of the ground contact surface of the tire formed on the protective plate can be pressed against the detection unit.
Therefore, when the tire is not pressed against the protective plate, the protective plate does not come into contact with the detection unit, and erroneous detection in the detection unit can be prevented. Furthermore, when the tire is pressed against the protective plate, the tire can be pressed against the detection unit via the protective plate, and the contact load distribution of the tire can be detected.

  ADVANTAGE OF THE INVENTION According to this invention, the ground load distribution detection apparatus which can detect the ground load distribution of the tire into which a lateral load, the front-back direction load, and a turning moment are input can be provided.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings as appropriate.
FIG. 1 is a perspective view showing a ground load distribution detection device, and FIG. 2 is an exploded view showing the structure of the ground load distribution detection device. As shown in FIG. 1, the ground load distribution detection device 1 according to the present embodiment is formed with a pressure sensor 11 on a mounting base 10 in which a top plate 10b is attached to a bottom plate 10a for adjusting the height. The
The pressure sensor 11 is attached so that the planar sensor surface 11a overlaps the plane of the top plate 10b, converts a load input to the sensor surface 11a into a load signal such as an electrical signal, and the like via the interface IF. It has a function of inputting to the measuring device 20 such as a personal computer.

  The measuring device 20 such as a personal computer calculates the load distribution on the sensor surface 11a based on the load signal input from the pressure sensor 11, and measures the ground contact state of the tire.

  As shown in FIG. 2, the pressure sensor 11 fixes the carbon plate 3 to the sensor sheet 2, a carbon plate (protection plate) 3 that covers the detection portion 2 a of the sensor sheet 2, and a mounting base 10 c provided in the mounting base 10. A frame 4 is formed in combination.

The sensor sheet 2 includes, for example, a detection portion 2a obtained by laminating two sheets of pressure-sensitive resistance ink printed in a strip shape so that the pressure-sensitive resistance ink intersects, and a contact resistance of the film at a portion where a load is applied. The electrode part 2b which takes out a change as an electrical signal (for example, change of an electric current) is comprised.
The detection unit 2 a is a flat surface that is, for example, a rectangle, and the sensor sheet 2 is provided on the mounting base 10 with the detection unit 2 a being placed on the flat surface of the top plate 10 b of the mounting base 10.

The electrode portion 2b of the sensor sheet 2 is provided, for example, in a strip shape extending from the periphery of the detection portion 2a toward the outside, and makes it easy to extract an electric signal.
A flat surface of the top plate 10b constituting the mounting base 10 is provided with a mounting base 10c which is higher (thick) than the thickness of the detection unit 2a and is formed so as to surround the rectangle of the detection unit 2a.
The mounting base 10c can be formed, for example, by fixing a member obtained by combining plate-like members thicker than the thickness of the detecting portion 2a of the sensor sheet 2 in a frame shape to the plane of the top plate 10b.
Note that the mounting base 10c, the configuration notch 10c ₁ for drawing out an electrode portion 2b of the sensor sheet 2 outside the frame is formed is preferable.

  The carbon plate 3 is a thin plate made of carbon and having a thickness of about 0.1 to 0.2 mm. The carbon plate 3 is sandwiched between the frame 4 and the mounting base 10c so as to cover the detection portion 2a of the sensor sheet 2. Provided.

The frame 4 is a frame-shaped member made of, for example, aluminum and formed to be equal to the planar shape of the mounting base 10c.
As described above, the carbon plate 3 is sandwiched between the frame 4 and the mounting base 10c, so that the frame-shaped opening of the frame 4 is covered with the carbon plate 3 from the mounting base 10c side, and the sensor of the pressure sensor 11 Surface 11a is formed.

The method of fixing the frame 4 to the mounting base 10c is not limited. For example, a plurality of fixing holes 4a through which fastening members such as screws S1 pass are provided in the frame 4, and the carbon plate 3 has A fixing hole 3a through which the screw S1 passes is provided so as to correspond to the fixing hole 4a.
Further, a screw hole 10c ₂ into which the screw S1 is screwed is formed in the mounting base 10c so as to correspond to the fixing hole 4a of the frame 4, and the frame 4 and the carbon plate 3 are fastened and fixed to the mounting base 10c with the screw S1. What is necessary is just to be the structure to do.

  Alternatively, when the mounting base 10c is formed by fixing the members combined in a frame shape to the plane of the top plate 10b, the mounting base 10c is fixed to the top plate with a screw S1 that fixes the frame 4 and the carbon plate 3 to the mounting base 10c. The structure which fastens together to 10b may be sufficient.

FIG. 3 is a cross-sectional view of the ground load distribution detecting device, and is a cross-sectional view taken along the line X1-X1 in FIG.
As shown in FIG. 3, the mounting base 10c provided on the top plate 10b is formed thicker than the thickness of the detecting portion 2a of the sensor sheet 2, and the carbon plate 3 is sandwiched between the mounting base 10c and the frame 4 and has an appropriate tension. Is fixed. With this configuration, a clearance CL is formed between the carbon plate 3 and the detection portion 2 a of the sensor sheet 2.
For example, when the sensor sheet 2 having the detection part 2a having a thickness of 0.3 mm is used, if the height of the mounting base 10c is set to 0.5 mm, the distance between the carbon plate 3 and the sensor sheet 2 is 0.2 mm. The clearance CL can be formed.

  Thus, by forming the clearance CL between the detection part 2a of the sensor sheet 2 and the carbon plate 3, it is possible to prevent the carbon plate 3 and the detection part 2a from contacting each other. And the misdetection by the sensor sheet | seat 2 which the carbon plate 3 generate | occur | produces in contact with the detection part 2a can be prevented.

(A) of FIG. 4 is the figure which looked at the structure of the mounting base from the back side.
As shown to (a) of FIG. 4, the mounting base 10 is comprised by attaching the bottom plate 10a to the back surface (side in which the sensor sheet 2 is not provided) of the top plate 10b.

The top plate 10b is a plate-like member made of, for example, an aluminum alloy, and has a rectangular shape 10b ₁ having a planar shape that is the same as that of the mounting base 10c (see FIG. 2).
In FIG. 4A, a planar top plate 10b in which a rectangle is combined with a circle is shown. However, the planar shape is not limited and is the same shape as the rectangle of the mounting base 10c. if the planar shape having a rectangular portion 10b ₁ of, and may be any shape.

For example, a shallow concave portion may be formed on the back side of the top plate 10b to reduce the amount of aluminum alloy used as a material and reduce the weight of the top plate 10b.
In this case, a configuration in which the reinforcing rib 10b ₂ is formed in the shallow concave portion and the rigidity of the top plate 10b is increased is preferable.
Reinforcing ribs 10b _2, for example, a rectangular portion 10b ₁ of a rectangular shape along the circumference, and may be from the center of the rectangular portion 10b ₁ and the structure that is formed radially toward the periphery.
With this configuration, while maintaining the rigidity of the top plate 10b, there is an effect of reducing the material cost by reducing the weight of the top plate 10b and reducing the amount of aluminum alloy used.

Further, a shallow recess between the reinforcing ribs 10b ₂ and the reinforcing ribs 10b _2, for example may be configured to embed the reinforcing member 10b ₃ of nylon material. With this configuration, the rigidity of the top plate 10b can be further increased.

Further, the electrode holding portion 10b ₄ for holding the electrode portion 2b of the sensor sheet 2, into a shape corresponding to the electrode portions 2b may be formed on the outer periphery of the top plate 10b. The electrode holding portion 10b ₄ by forming the shape of the electrode portion 2b of the sensor sheet 2 can be stabilized, it is possible to securely connect the interface IF and the electrode portion 2b shown in FIG.

The bottom plate 10a is a plate-like member made of, for example, a nylon material and exhibiting the same planar shape as that of the top plate 10b.
In addition, what is necessary is just to set the thickness of the baseplate 10a suitably according to the height requested | required of the mounting base 10. FIG.
Further, since the weight of the bottom plate 10a, the bottom plate 10a may be formed a plurality of through holes 10a _3, for example.

The bottom plate 10a, for example, located five screwing holes 10a ₁ corresponding to the center and the vicinity of the corner portions of the rectangular portion of the top plate 10b is formed, threaded into five screw holes 10b ₅ provided in the top plate 10b It fixes to the top plate 10b with fastening members, such as bolt B1 to match.

FIG. 4B is a cross-sectional view taken along the line X2-X2 in FIG. 4A and shows the shape of the screw hole. As described above, since the bottom plate 10a is a member formed of a low-rigidity material such as nylon, there is a possibility that the bottom plate 10a cannot be reliably fixed when fixed to the top plate 10b with a bolt B1 or the like. Therefore, for example, screwed holes 10a ₁ is fitted a collar 100 containing aluminum as the material is suitable.

Collar 100 is a tubular member bolts B1 passes, to form a screwed hole 10a ₁ is fitted a collar 100 into a through hole formed in the bottom plate 10a.
Note that the collar 100 may have an enlarged diameter at one end so as to accommodate the head of the bolt B1. With this configuration, when the bolt B1 penetrates the collar 100, the head can be prevented from protruding in a convex shape from the plane of the bottom plate 10a.

Further, forming a composed mounting base 10 includes a bottom plate 10a and the top plate 10b, fixed to the ground plane (not shown) facility side, the fixing holes 10a ₂ which fastening members such as bolts (not shown) penetrates, the bottom plate 10a The configuration is suitable.

FIG. 4C is a cross-sectional view taken along the line X3-X3 in FIG. 4A, illustrating the configuration of the fixing hole. As described above, since the bottom plate 10a is a member formed of a low-rigidity material such as nylon, the mounting base 10 is securely attached when it is fixed to a grounding surface on the equipment side (not shown) with a bolt (not shown). There is a possibility that it cannot be fixed. Therefore, for example, the fixing hole 10a ₂ into which the collar 101 made of aluminum is fitted may be used.

Color 101 is a tubular member fastening members such as bolts (not shown) passes, forming a fixing hole 10a ₂ by fitting the collar 101 into the through holes formed in the bottom plate 10a.
Further, a through hole 10b ₆ is formed in the top plate 10b so as to correspond to the fixing hole 10a ₂ of the bottom plate 10a, and a fastening member such as a bolt (not shown) is attached to the top plate 10b from the surface 10b _S side. _6, and a fixing hole 10a ₂ inserted so as to pass through is fixed to the ground plane of the equipment (not shown) side a mounting base 10.

  As described above, as shown in FIG. 4A, the base plate 10a is fixed to the top plate 10b, and the mounting base 10 to which the pressure sensor 11 is attached is formed. And as shown in FIG. 2, the pressure sensor 11 is attached to the mounting base 10, and the grounding load distribution detection apparatus 1 is comprised.

FIG. 5A is a diagram showing a state in which the contact load distribution of the tire is detected by the contact load distribution detection device, and FIG. 5B is a cross-sectional view taken along the line X4-X4 in FIG. As shown to (a) of FIG. 5, the pressure sensor 11 with which the contact load distribution detection apparatus 1 is provided is installed in a horizontal installation surface so that the sensor surface 11a may face upwards. When placing the tire Ti to the sensor surface 11a from above the carbon plate 3, tire Ti is pressed against the carbon plate 3 by its own weight, forming a ground plane 2a _1.

At this time, as shown in (b) of FIG. 5, a carbon plate 3 is deflection by the load in the vertical direction applied from the tire Ti, region of the ground surface 2a ₁ is pressed against the detecting portion 2a of the sensor sheet 2.
The detecting unit 2a detects the distribution of the load of the ground surface 2a ₁ as ground load distribution. The detected ground load distribution is converted into a load signal such as an electric signal, and is input to the measurement device 20 such as a personal computer via the interface IF.
Measuring device 20 such as a personal computer, based on the input load signal, to calculate the shape and the ground contact load distribution of the ground plane 2a _1, to measure the grounding condition of the tire Ti.

As shown in FIGS. 5A and 5B, the sensor surface 11a of the pressure sensor 11 according to this embodiment has a configuration in which the carbon plate 3 is interposed between the detection portion 2a of the sensor sheet 2 and the tire Ti. is there. Since the carbon plate 3 has sufficient strength against the load in the horizontal direction, a lateral load, a longitudinal load, and a turning moment are input to the tire Ti pressed against the carbon plate 3 so that the carbon plate 3 Even if a load in the direction is applied, the carbon plate 3 is not damaged.
Therefore, even when a lateral load, a longitudinal load, or a turning moment is input to the tire Ti pressed against the carbon plate 3, a horizontal load is not input to the detection unit 2a.
The lateral load is a load acting in the width direction of the tread of the tire Ti, and the longitudinal load is a load acting in a direction perpendicular to the width direction of the tire Ti and within the sensor surface 11a.

As described above, since the detection unit 2a of the sensor sheet 2 is configured by laminating two films printed with pressure-sensitive resistance ink, when a horizontal load is input to the detection unit 2a, For example, peeling of the printed pressure-sensitive resistance ink or peeling of two laminated films may occur, and the sensor sheet 2 may be damaged.
As a result, the sensor seat 2 cannot detect a ground load distribution when a lateral load, a longitudinal load, or a turning moment is input to the tire Ti pressed against the detection unit 2a.

The sensor surface 11a of the pressure sensor 11 according to the present embodiment has a carbon plate 3 interposed between the detection unit 2a and the tire Ti, so that the sensor surface 11a is lateral to the tire Ti pressed against the detection unit 2a via the carbon plate 3. Even if a load, a longitudinal load, or a turning moment is input, a horizontal load is not input to the detection unit 2a, and the sensor sheet 2 can be prevented from being damaged.
Therefore, the pressure sensor 11 according to the present embodiment can detect a ground load distribution when a lateral load, a longitudinal load, or a turning moment is input to the tire Ti pressed against the sensor surface 11a.

For example, a vehicle that travels while receiving a lateral load by inputting a lateral load to the tire Ti pressed against the sensor surface 11a and detecting a change in the ground load distribution of the tire Ti that moves in the horizontal direction along the sensor surface 11a. The change in the ground load distribution of the tire Ti included in can be simulated.
Similarly, when a longitudinal load is input to the tire Ti pressed against the sensor surface 11a, it is possible to simulate a change in the ground load distribution of the tire Ti to which the longitudinal load is input.
Further, since the tire Ti pressed against the sensor surface 11a detects a change in vertical load distribution when the turn in the ground plane 2a _1, tire Ti to turn in steering operation, i.e., the tire Ti which turning moment is input Changes in the ground load distribution can be simulated.

In this way, by detecting a change in the ground load distribution of the tire Ti that operates in the horizontal plane of the sensor surface 11a, the vehicle when turning by steering operation and traveling while receiving a lateral load or a longitudinal load is detected. Changes in the tire Ti and the road surface load distribution can be detected.
Then, the measuring device 20 such as a personal computer can measure the ground contact state of the tire Ti of the vehicle when turning by a steering operation and traveling while receiving a lateral load or a longitudinal load.

  For example, a vehicle designer can use a tire Ti or the like that suitably contacts the road surface when the vehicle turns by steering operation and travels while receiving a lateral load or a longitudinal load based on the measurement result of the ground contact state. A suspension (suspension device) can be designed, and an excellent effect of improving the riding comfort and operability of a vehicle including the tire Ti and the suspension (suspension device) is achieved.

  Furthermore, as shown in FIG. 2, since the detection part 2a of the sensor sheet 2 of the ground load distribution detection device 1 according to the present embodiment is protected by the carbon sheet 3, the deterioration of the sensor sheet 2 is suppressed. Therefore, there is an excellent effect that the life of the ground load distribution detection device 1 can be extended.

It is a perspective view which shows a ground load distribution detection apparatus. It is an exploded view which shows the structure of a ground load distribution detection apparatus. It is X1-X1 sectional drawing in FIG. (A) is the figure which looked at the structure of the mounting base from the back side, (b) is X2-X2 sectional drawing in (a) of FIG. 4, (c) is X3- in (a) of FIG. It is X3 sectional drawing. (A) is a figure which shows the state which detects the contact load distribution of a tire with a contact load distribution detection apparatus, (b) is X4-X4 sectional drawing in (a) of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grounding load distribution detection apparatus 2 Sensor sheet 2a Detection part 2a ₁ Grounding surface 3 Carbon plate (protection plate)
CL clearance Ti tire

Claims (3)

A contact load distribution detection device including a sensor sheet for detecting a contact load distribution of a tire,
A grounding load distribution detecting device, wherein a protective plate is interposed between the tire and the sensor seat. The sensor sheet includes a detection unit including a plane covered with the protection plate,
The contact load distribution detection device according to claim 1, wherein the contact load distribution of the tire pressed against the detection unit via the protective plate is detected. Between the protection plate and the detection unit, a clearance for preventing mutual contact is provided,
The contact load distribution detection device according to claim 2, wherein when the tire is pressed against the protection plate, an area of the contact surface of the tire formed on the protection plate is pressed against the detection unit.

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