JP2018048907A - Brake pressure distribution measurement method and brake pressure distribution measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable pressure distribution in the same state as an environment where a brake is actually actuated to be easily measured for each of both side surfaces of a rotor.SOLUTION: A brake pressure distribution measurement method comprises installing a displacement sensor 25 for an outer pad and a displacement sensor 26 for an inner pad between an outer disc plate 21 and inner disc plate 22 of a disc rotor 20, and measuring displacement of each pad slide surface. The method comprises executing analysis with a computer, based on minute displacement of each pad slide surface obtained by the measurement, and calculating pressure distribution on each pad slide surface. The method comprises forming a hole on the outer disc plate 21 and the inner disc plate 22 to locally reduce rigidity, or devising a structure of the displacement sensor to change sensitivity for each surface of each displacement sensor.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a brake pressure distribution measuring method and a brake pressure distribution measuring apparatus that can be used to analyze the state of a brake system mounted on a vehicle, for example.

  When developing a brake system mounted on a vehicle or the like, for example, it is important to correctly grasp the distribution of force acting between the disk rotor surface constituting the brake and the friction material.

  For example, in a vehicle, it may be required to prevent or suppress a sound (brake squeal) generated when an installed brake system is operated, and such squeal needs to be analyzed.

  For example, the pressure distribution on the contact surface between the disc rotor of the brake and the friction material is useful information that can be used as a boundary condition for numerical analysis including brake squeal analysis. In addition, the pressure distribution at the contact surface between the disk rotor and the friction material can be expected to provide a clue to discover interesting knowledge about the wear behavior of the friction material.

  Thus, for example, Patent Document 1 proposes a technique for easily measuring the pressure distribution in the same state as the environment where the brake is actually operated. That is, rotation along the pressing direction of the movable part (caliper 30) in a state in which the rotating body is rotating by a sensor (strain gauge 60) disposed on or near the rotating body (disk rotor 20). A minute displacement of the shape of the body is measured, and based on the minute displacement of the shape of the rotating body obtained by the measurement, a pressure distribution to the rotating body is calculated by computer analysis.

JP-A-2016-98900

  On the other hand, in a disc brake system, a disc rotor that rotates with a wheel is pressed from both sides with a brake pad incorporated in a brake caliper to generate a frictional force, and the frictional force is converted into thermal energy for braking.

  Therefore, both the pressure distribution on the contact surface between the one surface (inner side) of the disc rotor and the brake pad and the pressure distribution on the contact surface between the other surface (outer side) of the disc rotor and the brake pad are accurately determined. It is important to understand. In addition, the former pressure distribution and the latter pressure distribution are not necessarily the same.

  However, in the prior art as disclosed in Patent Document 1, it is possible to estimate the pressure distribution on the contact surface between the disk rotor surface and the brake pad, but the pressure distribution on the inner side contact surface and the outer side contact surface It was not possible to measure the pressure distribution in

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to facilitate the pressure distribution in the same state as the environment in which the brake is actually operated, and to individually apply pressure to each of both side surfaces of the rotating body. It is an object of the present invention to provide a brake pressure distribution measuring method and a brake pressure distribution measuring device capable of measuring the distribution.

  In order to achieve the above-described object, the brake pressure distribution measuring method and the brake pressure distribution measuring apparatus according to the present invention are characterized by the following (1) to (9).

(1) including a rotating body having a first side surface portion and a second side surface portion, and a movable portion capable of pressing the rotating body in contact with the first side surface portion and the second side surface portion. In the brake system to be measured, a brake pressure distribution measuring method for measuring the pressure distribution to the rotating body due to the pressing of the movable part,
Installing a plurality of displacement sensors between the first side surface portion and the second side surface portion;
The rotating body is formed in a state in which the first side surface portion and the second side surface portion have different rigidity for each position where the plurality of displacement sensors are installed,
Using the plurality of displacement sensors, each of the first side surface portion and the second side surface portion on the rotating body along the pressing direction of the movable portion in a state where the rotating body is rotating. Measure the small displacement of the shape at
Based on the micro displacement of the shape of the first side surface portion obtained by the measurement and the micro displacement of the second side surface portion, the pressure distribution in the first side surface portion by the analysis by the computer, and the second Calculate the pressure distribution at the side part,
Brake pressure distribution measuring method characterized by the above.

(2) Based on the minute displacement of the shape of the rotating body obtained by the measurement, the pressure distribution to the rotating body is calculated by inverse analysis.
The brake pressure distribution measuring method according to (1) above, wherein

(3) An opening is provided in one of the first side surface portion and the second side surface portion facing the displacement sensor at each position where a plurality of the displacement sensors are installed in the rotating body. Or reduce the rigidity by forming one or more holes,
The brake pressure distribution measuring method according to (1) or (2) above, wherein

(4) including a rotating body having a first side surface portion and a second side surface portion, and a movable portion capable of pressing the rotating body in contact with the first side surface portion and the second side surface portion. In the brake system to be measured, a brake pressure distribution measuring method for measuring the pressure distribution to the rotating body due to the pressing of the movable part,
Installing a plurality of displacement sensors between the first side surface portion and the second side surface portion;
The displacement sensor has a structure that makes the sensitivity to displacement in the first side surface portion and the second side surface portion different,
Using the plurality of displacement sensors, each of the first side surface portion and the second side surface portion on the rotating body along the pressing direction of the movable portion in a state where the rotating body is rotating. Measure the small displacement of the shape at
Based on the micro displacement of the shape of the first side surface portion obtained by the measurement and the micro displacement of the second side surface portion, the pressure distribution in the first side surface portion by the analysis by the computer, and the second Calculate the pressure distribution at the side part,
Brake pressure distribution measuring method characterized by the above.

(5) The displacement sensor has a displacement amount when the first side surface portion and the second side surface portion are pressed with the same force against the first side surface portion and the second side surface portion, respectively. Having a structure in contact with different parts,
The brake pressure distribution measuring method according to (4) above, wherein

(6) including a rotating body having a first side surface portion and a second side surface portion, and a movable portion capable of pressing the rotating body in contact with the first side surface portion and the second side surface portion. In the brake system to be measured, a brake pressure distribution measuring device for measuring the pressure distribution to the rotating body due to the pressing of the movable part,
A plurality of displacement sensors installed between the first side surface portion and the second side surface portion;
In a state where the rotating body is in a rotational motion, a minute displacement of a shape in each of the first side surface portion and the second side surface portion of the rotating body along the pressing direction of the movable portion is detected by the displacement sensor. A data measurement unit to acquire based on the output of
A pressure distribution calculating unit that calculates data of pressure distribution to the rotating body by inverse analysis based on data representing a minute displacement of the shape of the rotating body acquired by the data measuring unit;
The rotating body is formed in a state in which the first side surface portion and the second side surface portion have different rigidity for each position where the plurality of displacement sensors are installed,
The pressure distribution calculation unit calculates a pressure distribution in the first side surface portion and a pressure distribution in the second side surface portion, respectively.
Brake pressure distribution measuring device.

(7) The rotating body is rigid at either one of the first side surface portion and the second side surface portion facing the displacement sensor at each position where the plurality of displacement sensors are installed. One or more openings or holes for lowering
The brake pressure distribution measuring device according to (6) above, wherein

(8) The first displacement sensor included in the plurality of displacement sensors is fixed to the first side surface portion and disposed at a position where the detection surface faces the second side surface portion,
The second displacement sensor included in the plurality of displacement sensors is fixed to the second side surface portion, and is disposed at a position where the detection surface faces the first side surface portion.
The brake pressure distribution measuring device according to (6) or (7) above, wherein

(9) including a rotating body having a first side surface portion and a second side surface portion, and a movable portion capable of pressing the rotating body in contact with the first side surface portion and the second side surface portion. In the brake system to be measured, a brake pressure distribution measuring device for measuring the pressure distribution to the rotating body due to the pressing of the movable part,
A plurality of displacement sensors installed between the first side surface portion and the second side surface portion;
In a state where the rotating body is in a rotational motion, a minute displacement of a shape in each of the first side surface portion and the second side surface portion of the rotating body along the pressing direction of the movable portion is detected by the displacement sensor. A data measurement unit to acquire based on the output of
A pressure distribution calculating unit that calculates data of pressure distribution to the rotating body by inverse analysis based on data representing a minute displacement of the shape of the rotating body acquired by the data measuring unit;
The displacement sensor has a structure that varies sensitivity to displacement in the first side surface portion and the second side surface portion,
The pressure distribution calculation unit calculates a pressure distribution in the first side surface portion and a pressure distribution in the second side surface portion, respectively.
Brake pressure distribution measuring device.

  According to the brake pressure distribution measuring method having the above configurations (1) and (2), the rigidity of the first side surface portion and the second side surface portion is different for each position where the displacement sensor is installed. For each of the plurality of displacement sensors, the sensitivity to the pressure of the contact surface in the first side surface portion is different from the sensitivity to the pressure of the contact surface in the second side surface portion. Therefore, the first displacement sensor included in the plurality of displacement sensors can be arranged so as to distinguish and detect the pressure of the contact surface in the first side surface portion, and the second displacement sensor included in the plurality of displacement sensors. A displacement sensor can also be arrange | positioned so that the pressure of the contact surface in a 2nd side part may be distinguished and detected.

  According to the brake pressure distribution measuring method having the above configuration (3), the first side surface portion or the second side surface portion is affected by the opening or the hole formed in the first side surface portion or the second side surface portion. The rigidity of the is lower than that of the other side surface. Therefore, the difference between the rigidity of the first side surface portion and the rigidity of the second side surface portion is caused by a simple configuration, the sensitivity of the displacement sensor to the displacement of the contact surface of the first side surface portion, and the second A difference can be made between the sensitivity of the displacement sensor to the displacement of the contact surface of the side part.

  According to the brake pressure distribution measuring method having the configurations of (4) and (5) above, the displacement sensor has different sensitivities to displacement in the first side surface portion and the second side surface portion. The first displacement sensor included in the first displacement sensor can be arranged so as to distinguish and detect the pressure of the contact surface in the first side surface portion, and the second displacement sensor included in the plurality of displacement sensors includes The pressure on the contact surface in the second side surface portion can be distinguished and detected.

  According to the brake pressure distribution measuring device having the configuration of (6) above, the first side surface portion and the second side surface portion have different stiffnesses for each position where the displacement sensor is installed, so that a plurality of displacements For each of the sensors, the sensitivity to the pressure of the contact surface on the first side surface portion is different from the sensitivity to the pressure of the contact surface on the second side surface portion. Therefore, the first displacement sensor included in the plurality of displacement sensors can be arranged so as to distinguish and detect the pressure of the contact surface in the first side surface portion, and the second displacement sensor included in the plurality of displacement sensors. A displacement sensor can also be arrange | positioned so that the pressure of the contact surface in a 2nd side part may be distinguished and detected.

  According to the brake pressure distribution measuring device having the configuration (7), the first side surface portion or the second side surface portion is affected by the opening or the hole formed in the first side surface portion or the second side surface portion. The rigidity of the is lower than that of the other side surface. Therefore, a simple configuration makes a difference between the rigidity of the first side surface portion and the rigidity of the second side surface portion, and the sensitivity of the displacement sensor to the displacement of the contact surface of the first side surface portion, A difference can be made between the sensitivity of the displacement sensor to the displacement of the contact surface of the side part.

  According to the brake pressure distribution measuring apparatus having the above configuration (8), each of the first displacement sensor and the second displacement sensor has a relative displacement between the first side surface portion and the second side surface portion. Can be detected. In addition, since the first displacement sensor and the second displacement sensor are each fixed to a portion having relatively large rigidity and small displacement, the sensor is unlikely to drop off from the fixed portion.

  According to the brake pressure distribution measuring device having the above configuration (9), the displacement sensor has different sensitivity to displacement in the first side surface portion and the second side surface portion. The first displacement sensor included can be arranged to distinguish and detect the pressure of the contact surface in the first side surface portion, and the second displacement sensor included in the plurality of displacement sensors is the second It can also arrange | position so that the pressure of the contact surface in a side part may be distinguished and detected.

According to the brake pressure distribution measuring method and the brake pressure distribution measuring device of the present invention, the first side surface portion and the second side surface portion are in different states for each position where the displacement sensor is installed. For each of the displacement sensors, the sensitivity to the pressure of the contact surface in the first side surface portion is different from the sensitivity to the pressure of the contact surface in the second side surface portion. Therefore, the first displacement sensor included in the plurality of displacement sensors can be arranged to distinguish and detect the pressure of the contact surface in the first side surface portion, and the second displacement sensor includes the second displacement sensor included in the plurality of displacement sensors. The displacement sensor may be arranged so as to distinguish and detect the pressure of the contact surface in the second side surface portion.
Further, since the displacement sensor detects a minute displacement of the shape of the rotating body, it can be disposed at a position away from the contact surface between the rotating body and the movable part. Therefore, the structure and shape of the friction material arranged on the movable part at the time of measurement can be the same as the environment in which the brake actually operates. In addition, the state of the contact surface at the time of measurement can be set to the same state as the environment where the brake is actually operated. This makes it possible to measure pressure distribution with high accuracy. In addition, since the measurement is performed while the rotating body is moving, the pressure distribution in the moving direction can be detected by at least two displacement sensors.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1 is a block diagram illustrating a configuration example of a brake pressure distribution measuring device according to an embodiment of the present invention. FIG. 2 is a front view showing an appearance of a disk rotor equipped with a plurality of displacement sensors. FIG. 3 is a partially enlarged view showing a part of the disk rotor shown in FIG. 2 in an enlarged manner. FIG. 4 is a graph showing an example of a point load response function measured by a plurality of displacement sensors. FIG. 5 is a block diagram showing a flow of processing for identifying the contact surface pressure. FIG. 6 is a graph showing values and correct values identified using the identification method shown in FIG. FIG. 7 is a flowchart showing a typical processing procedure in the brake pressure distribution measuring apparatus according to the embodiment of the present invention. FIG. 8A is a longitudinal sectional view showing the displacement magnifying mechanism, and FIG. 8B is a longitudinal sectional view showing the displacement magnifying mechanism with the strain gauge attached. FIG. 9 is a perspective view showing an appearance of a typical normal brake pad. FIG. 10 is a graph showing a specific example of a measurement result when a normal type brake pad is used. FIG. 11 is a graph showing a specific example of a measurement result when a point pad response measurement brake pad is used. FIG. 12 is a graph showing a specific example of the L-curve characteristic calculated based on the measurement result. FIG. 13 is a graph showing a specific example of the pressure distribution characteristic calculated based on the measurement result. FIG. 14 is a flowchart showing a modification of the processing procedure in the brake pressure distribution measuring device according to the embodiment of the present invention. FIGS. 15A and 15B show a sensor structure of a modified example installed on the disk rotor, and FIGS. 15A and 15B are front views showing different displacement states.

  Specific embodiments relating to the present invention will be described below with reference to the drawings.

<System configuration example>
A configuration example of a brake pressure distribution measuring device 10 according to an embodiment of the present invention is shown in FIG. The brake pressure distribution measuring apparatus 10 is a disk brake apparatus including a rotatable disk rotor 20 and a caliper 30 as shown in FIG. Of course, for example, a drum-type brake device can be set as a measurement target.

  The caliper 30 is disposed at a position facing the disc rotor 20 and includes a movable portion (a piston (not shown)) that moves by hydraulic control. That is, the brake pad (31A shown in FIG. 9) is pressed against the surface of the disk rotor 20 by moving the movable part of the caliper 30, and the rotation of the disk rotor 20 is braked by the frictional force generated on these contact surfaces. be able to.

  When this disc brake device is mounted on a vehicle, the disc brake device is connected to the rotating shaft of the wheel in the vicinity of the central opening 20 a of the disc rotor 20. Also, when the measurement is performed using the brake pressure distribution measuring device 10 shown in FIG. 1, the disk rotor 20 is connected to the rotation shaft of an actual vehicle wheel or a special rotation shaft for testing. And used in a rotatable state.

  In addition to the disc rotor 20 and the caliper 30, the brake pressure distribution measuring apparatus 10 shown in FIG. 1 includes a hydraulic gauge 40, an outer pad displacement sensor 25, an inner pad displacement sensor 26, a data logger 70, a calculation unit 80, An amplifier 90 and an optical encoder 95 are provided.

  The hydraulic gauge 40 is a sensor for detecting the hydraulic pressure applied to the piston of the movable part of the caliper 30. The hydraulic gauge 40 is not indispensable, and the brake pressure distribution can be measured without the hydraulic gauge 40.

  The outer pad displacement sensor 25 is provided to detect a minute displacement in the thickness direction of the pad contact surface on the outer side of the disk rotor 20, that is, the pressing surface. The inner pad displacement sensor 26 is provided to detect a minute displacement in the thickness direction on the pad contact surface inside the disk rotor 20, that is, the pressing surface.

  Each of the outer pad displacement sensor 25 and the inner pad displacement sensor 26 includes a displacement magnifying mechanism 50 and a strain gauge 60 which will be described later. The strain gauge 60 is a thin plate-shaped strain sensor provided to measure a minute displacement in the thickness direction on the pressing surface of the disk rotor 20, and is composed of a semiconductor (silicon: Si).

  The displacement enlarging mechanism 50 has a function of enlarging a minute displacement generated in the disk rotor 20 and transmitting it to the strain gauge 60. That is, since the displacement of the disc rotor 20 caused by the pressing of the caliper 30 is extremely small, the displacement enlarging mechanism 50 is disposed between the disc rotor 20 and the strain gauge 60 so that this minute displacement can be detected with high sensitivity. . The displacement enlarging mechanism 50 will be described in detail later.

  The amplifier (strain amplifier) 90 amplifies the electrical signals output from the strain gauges 60 of the outer pad displacement sensor 25 and the inner pad displacement sensor 26 and outputs the amplified signal.

  The optical encoder 95 is a reflective optical sensor that is fixed at a position facing the outer periphery of the disk rotor 20 with the optical axis directed toward the disk rotor 20, and corresponds to the rotational position of the disk rotor 20, that is, the rotational angle. Outputs electrical signals.

  The data logger 70 is a device that automatically records data obtained at the time of measurement. That is, in the configuration of FIG. 1, hydraulic pressure data output from the hydraulic gauge 40, output data obtained by amplifying the outputs of the strain gauge 60 of the outer pad displacement sensor 25 and the inner pad displacement sensor 26 by the amplifier 90, and The rotational position (angle) data output from the optical encoder 95 is simultaneously recorded as time series data.

  The calculation unit 80 performs a predetermined calculation based on the data recorded by the data logger 70 and calculates data representing the pressure distribution state in the circumferential direction of the disk rotor 20. Specific contents of the calculation will be described later in detail.

<Relationship Between Disc Rotor 20 and Displacement Sensors 25 and 26>
FIG. 2 shows the appearance of the disc rotor 20 on which the outer pad displacement sensor 25 and the inner pad displacement sensor 26 are mounted. 3 is an enlarged view of a part of the disk rotor 20 shown in FIG.

  The disc rotor 20 shown in FIG. 2 has a circular outer disc plate 21 and an inner disc plate 22 with sufficiently large diameters spaced apart in the thickness direction (Z-axis direction) so that a gap 23 is formed. It is fixed in the opposite state. A support portion 24 supports the outer disk plate 21 and the inner disk plate 22. The gap 23 between the outer disk plate 21 and the inner disk plate 22 is provided to efficiently dissipate heat generated in the disk rotor 20 during braking.

  As shown in FIGS. 2 and 3, in the brake pressure distribution measuring apparatus 10 of FIG. 1, each of the outer pad displacement sensor 25 and the inner pad displacement sensor 26 is provided in the space 23 near the outer periphery of the disk rotor 20. It is fixed to. Further, the outer pad displacement sensor 25 and the inner pad displacement sensor 26 are arranged at positions slightly shifted from each other in the circumferential direction of the disk rotor 20.

  The base portion of the outer pad displacement sensor 25 is fixed to the displacement sensor fixing portion 22b of the inner disk plate 22, and the detection surface of the outer pad displacement sensor 25 is arranged in contact with the opposite side wall of the outer disk plate 21. It is. On the other hand, the base portion of the inner pad displacement sensor 26 is fixed to the displacement sensor fixing portion 21b of the outer disk plate 21, and the detection surface of the inner pad displacement sensor 26 is in contact with the opposite side wall of the inner disk plate 22. It is arranged.

  Further, a rigidity adjusting portion 21 a is provided at a location facing the detection surface of the outer pad displacement sensor 25 of the outer disk plate 21. The stiffness adjusting portion 21a is a structure for locally lowering the stiffness of the outer disk plate 21. Specifically, a plurality of holes (two in this example) formed by drilling from the peripheral surface of the outer disk plate 21 toward the center of the circle are provided as the rigidity adjusting portion 21a.

  Similarly, a rigidity adjusting portion 22 a is provided at a location facing the detection surface of the inner pad displacement sensor 26 of the inner disk plate 22. The stiffness adjusting portion 22a is a structure for locally lowering the stiffness of the inner disk plate 22. Specifically, a plurality of holes (two in this example) formed by drilling from the peripheral surface of the inner disk plate 22 toward the center of the circle are provided as the stiffness adjusting portion 22a.

  That is, at the place where the outer pad displacement sensor 25 is installed, the rigidity of the outer disk plate 21 is smaller than that of the inner disk plate 22, so that the outer disk plate 21 and the inner disk plate 22 are simultaneously pressed by the brake pad. At the time of displacement, the displacement of the outer disk plate 21 becomes relatively large. As a result, the sensitivity of the outer pad displacement sensor 25 to the displacement of the outer disk plate 21 is increased compared to the displacement of the inner disk plate 22. That is, the outer pad displacement sensor 25 is not easily affected by the displacement of the inner disk plate 22 and can detect the displacement of the outer disk plate 21 in a state in which it is distinguished from the displacement of the inner disk plate 22.

  Similarly, at the place where the inner pad displacement sensor 26 is installed, the rigidity of the inner disk plate 22 is smaller than that of the outer disk plate 21, so that the outer disk plate 21 and the inner disk plate 22 are simultaneously pressed by the brake pads. As a result, the displacement of the inner disk plate 22 becomes relatively large. As a result, the sensitivity of the inner pad displacement sensor 26 to the displacement of the inner disk plate 22 is increased compared to the displacement of the outer disk plate 21. That is, the inner pad displacement sensor 26 is less susceptible to the displacement of the outer disk plate 21 and can detect the displacement of the inner disk plate 22 in a state in which it is distinguished from the displacement of the outer disk plate 21.

<Example of point load response function measured by displacement sensor>
FIG. 4 shows an example of a point load response function measured using the outer pad displacement sensor 25 and the inner pad displacement sensor 26 mounted on the disk rotor 20.

  In FIG. 4, a signal SGo indicated by a solid line corresponds to a signal output from the outer pad displacement sensor 25, and a signal SGi indicated by a dotted line corresponds to a signal output from the inner pad displacement sensor 26. In FIG. 4, the horizontal axis of the graph represents the rotational position (Location) of the disk rotor 20 in angle [deg], and the vertical axis of the graph represents displacement [m / Pa].

  In FIG. 4, the displacement when a point load is applied to the outer sliding surface of the outer disk plate 21 and the displacement when a point load is applied to the inner sliding surface of the inner disk plate 22 are signaled. It is represented by SGo and SGi.

  As shown in FIG. 4, the two types of signals SGo and SGi show different reactions at the same rotational position. That is, at the rotation position near “−15 [deg]”, the amplitude of the signal SGo is sufficiently larger than the signal SGi, and at the rotation position near “+10 [deg]”, the amplitude of the signal SGi becomes the signal SGo. It is sufficiently large. Actually, the change detected at the rotational position near “−15 [deg]” corresponds to the displacement of the outer disk plate 21 due to the applied load, and is detected at the rotational position near “+10 [deg]”. This change corresponds to the displacement of the inner disk plate 22 due to the influence of the applied load.

  Therefore, by using the signal SGo of the outer pad displacement sensor 25, the displacement of the outer disk plate 21 can be detected with high sensitivity while the influence of the displacement of the inner disk plate 22 is suppressed. Further, by using the signal SGi of the inner pad displacement sensor 26, the displacement of the inner disk plate 22 can be detected with high sensitivity while the influence of the displacement of the outer disk plate 21 is suppressed. That is, if the outer pad displacement sensor 25 and the inner pad displacement sensor 26 are used, the displacement of the outer disk plate 21 and the displacement of the inner disk plate 22 can be individually detected.

<Principle explanation of pressure distribution measurement>
Since the deformation of the disk rotor 20 due to the pressure of the brake pad is minute, the disk rotor 20 is treated as an elastic body. That is, an observation equation representing the relationship between the brake pad pressure and the minute deformation of the disk rotor 20 is modeled in a linear relationship as shown below.

{Y} = [H] {x} (1)
However,
{Y}: Vector in which outputs of the displacement sensors (25, 26) are arranged with respect to the rotor rotation angle {x}: Vector in which the pressure distribution on the pad surface is discretized [H]: A discretized point load response function is performed Toeplitz matrix as component

  The above point load response function can be obtained experimentally by measuring using a special brake pad to which a concentrated load is applied in advance during braking. In the brake pressure distribution measuring apparatus 10 shown in FIG. 1, the problem for calculating the brake pressure distribution is the problem of obtaining {x} from the known [H] and {y} in the above equation (1). It will be returned.

The procedure for obtaining the solution of the above equation (1) becomes a problem of obtaining a vector {x} that minimizes the functional J shown below if the Tikhonov method is applied.
J = | Hx−y | ² + α | x | ² (2)
That is, the solution of the above equation (2) is expressed by the following equation (3).
{X} = ([H] ^t [H] + α [I]) ⁻¹ [H] ^t {y} (3)
However,
t: transposed matrix α: regularization parameter [I]: unit matrix

  In other words, the brake pressure distribution on the disk rotor 20 can be obtained by calculating the vector {x} using the above expression (3).

<Basic processing flow for identifying contact surface pressure>
FIG. 5 shows a basic process flow for identifying the contact surface pressure. That is, as shown in FIG. 5, a known point load 101 and an unknown pressure distribution 102 of each sliding surface are measured on the disk rotor 20, and the rotor displacement measurement result 103 is analyzed by inverse analysis 104. Thus, the unknown pressure distribution 102 of each sliding surface is identified. In the inverse analysis 104, an analysis is performed using a point load response function as shown in FIG. 4, the observation equation shown in the above equation (1), and Tikhonov regularization.

<Examination of validity of identification method>
A specific example of values and correct values identified using the identification method shown in FIG. 5 is shown in FIG. In the graph of FIG. 6, the horizontal axis represents the rotational position [deg] of the disk rotor 20, and the vertical axis represents the pressure [Pa]. Further, the values of the characteristics V1i and V1o indicated by solid lines in FIG. 5 represent correct values of the pressure on the inner side and the outer side, respectively, and the values of the characteristics V2i and V2o indicated by dotted lines in FIG. It represents the identification value of the pressure on the outer side.

  As shown in FIG. 5, there is no significant difference between the value of the characteristic V1i and the value of the characteristic V2i, and there is no significant difference between the value of the characteristic V1o and the value of the characteristic V2o. Therefore, the value identified using the identification method shown in FIG. 5 can be used as an appropriate value in the same way as the measured value.

<Actual measurement procedure>
FIG. 7 shows a typical processing procedure when measurement is performed using the brake pressure distribution measuring apparatus 10 shown in FIG. The processing procedure of FIG. 7 will be described below.

  In step S11, a “normal brake pad” is manually attached to the caliper 30 of the brake system to be measured. The “ordinary brake pad” is a general brake pad used when the brake system is used on an actual vehicle, and is designed with emphasis on the braking performance in the actual vehicle. A specific example of the appearance of the normal brake pad 31A is shown in FIG. Note that the operation of S11 is not necessary when the “normal type brake pad” is mounted in advance.

  In step S12, the piston in the caliper 30 is driven to press the brake pad against the disc rotor 20, and the disc rotor 20 is rotated at a constant speed (for example, 6 [rpm]) to perform measurement. The hydraulic pressure output from the hydraulic gauge 40, the displacement SG01 detected by the strain gauge 60 incorporated in each of the outer pad displacement sensor 25 and the inner pad displacement sensor 26 (output of the amplifier 90), and the optical encoder 95 And the rotation angle detected by the data logger 70 is simultaneously recorded on the measurement data log DB 1 by the data logger 70.

  The data group of the displacement SG01 recorded in S12 corresponds to the vector {y} shown in the above equation (1). A specific example of the data recorded in S12 is shown in FIG. 10, the horizontal axis represents the rotational position (location [angle (degree)]), the left vertical axis represents the displacement SG01 (Strain Gauge Output [V]), and the right vertical axis represents the output PO of the hydraulic gauge 40. (Pressure Output [MPa]). As shown in FIG. 10, every time the rotational position moves 360 degrees, a state in which a peak appears in the displacement SG01 at the same position corresponding to the press of the brake pad is observed.

  In step S13, a “point load measuring pad” is manually attached to the caliper 30 of the brake system to be measured instead of the “normal brake pad”. The “point load measuring pad” is a pad (not shown) specially prepared for measurement, does not consider the braking performance, and simply applies the load due to the piston pressing to one point. It has such a structure.

  In step S14, while the piston in the caliper 30 is driven and the brake pad is pressed against the disk rotor 20, the disk rotor 20 is rotated at a constant speed to perform measurement. The data logger 70 simultaneously correlates the hydraulic pressure output from the hydraulic gauge 40, the displacement (output of the amplifier 90) SG02 detected by each strain gauge 60, and the rotation angle detected by the optical encoder 95 with the data logger 70. Record on DB1.

  The data group of the displacement SG02 recorded in S14 corresponds to the Toeplitz matrix [H] shown in the above equation (1), and includes a discretized point load response function as a row component. A specific example of the data recorded in S14 is shown in FIG. In FIG. 11, the horizontal axis represents the rotational position (location [angle (degree)]), and the vertical axis represents the displacement SG02 (Strain Gauge Output [V]). As shown in FIG. 11, a distribution state in which a clean peak appears in the displacement SG02 is observed at the rotational position to which the point load is applied.

  Note that the procedure may be changed so that the processes of S11 and S12 are performed after the processes of S13 and S14 are performed.

  In step S15, based on the measurement data ({y}) of SG01 obtained in S12 and the measurement data ([H]) of SG02 obtained in S14, the “L-curve method” is applied, and L− Data representing the curve characteristic is obtained. The “L-curve method” is described, for example, in “PC Hansen, Analysis of discrete ill-posed problems by means of the L-curve, SIAM review 34 (4)”. A specific example of the L-curve characteristic calculated in S15 based on the measurement result is shown in FIG.

  In step S16, the regularization parameter α in the expressions (2) and (3) is determined based on the data representing the L-curve characteristic acquired in S15. For example, when the L-curve characteristic shown in FIG. 12 is obtained, it may be desirable to set it to about (α = 50). The regularization parameter α is assumed to be determined by the brake system designer while viewing the L-curve characteristic data. By identifying a predetermined condition, the regularization parameter α is regularized from the L-curve characteristic data. It is also possible to automatically determine the parameter α by a program or the like.

  In step S17, by applying the Tikonov method using SG01 measurement data ({y}) obtained by measurement, SG02 measurement data ([H]), and the regularization parameter α, the disc is recorded. The pressure distribution on the rotor 20 is calculated. That is, {y} corresponding to the measurement data of SG01, [H] corresponding to the measurement data of SG02, and the determined regularization parameter α are substituted into the equation (3), and the (3) By calculating the equation, a vector {x} obtained by discretizing the pressure distribution on the pad surface is obtained.

  Since the pressure distribution is not always the same between the outer pad sliding surface and the inner pad sliding surface of the disk rotor 20, each of the outer pad displacement sensor 25 and the inner pad displacement sensor 26 has the same pressure distribution. Using the measurement result, the pressure distribution is obtained individually for each of the outer and inner surfaces.

  A specific example of the pressure distribution characteristic calculated in S17 based on the measurement results of SG01 and SG02 is shown in FIG. The two peaks in the curve shown in FIG. 13 correspond to the positions of the two pistons of the caliper 30, and it is considered that a reasonable result is obtained as the pressure distribution.

  In addition, in the brake pressure distribution measuring apparatus 10 shown in FIG. 1, the calculating part 80 performs the process of each step S15, S16, S17 in FIG. The actual computing unit 80 can be configured by, for example, a general computer and a program including the processes of S15, S16, and S17 that can be executed on this computer.

<Detailed Description of Displacement Enlargement Mechanism 50 and Strain Gauge 60>
The displacement of the disc rotor 20 when pressed by the brake pad is negligible. Therefore, high detection performance is required for the outer pad displacement sensor 25 and the inner pad displacement sensor 26 for detecting this. Therefore, each of the outer pad displacement sensor 25 and the inner pad displacement sensor 26 shown in FIG. 1 includes a displacement magnifying mechanism 50 and a strain gauge 60 described below.

<Configuration Example of Displacement Enlargement Mechanism 50>
FIG. 8A shows the configuration of the longitudinal section of the displacement enlarging mechanism 50 employed in the outer pad displacement sensor 25 and the inner pad displacement sensor 26 of the brake pressure distribution measuring apparatus 10 of FIG. The displacement enlarging mechanism 50 forms a compliant mechanism (the mechanism is established only by deformation of the material itself).

  As shown in FIG. 8A, the displacement magnifying mechanism 50 includes an upper base portion 51, a first lever 52, a second lever 53, a lower base portion 54, a connecting portion 55 to a connecting portion 58, and a sensor mounting portion 59. It has. Each of the connecting portion 55 to the connecting portion 58 constitutes a small elastic hinge and can be slightly deformed.

  The first lever 52 of the displacement enlarging mechanism 50 is connected to the lower end of the upper base portion 51 via the connecting portion 55 in the vicinity of the right end in FIG. Further, the lower end of the position shifted slightly to the left from the right end of the first lever 52 is connected to the upper end of the lower base portion 54 via the connecting portion 56. Further, the vicinity of the left end of the first lever 52 is connected to the vicinity of the right end of the second lever 53 via a connecting portion 57.

  Further, the second lever 53 is connected to the first lever 52 through the connecting portion 57 in the vicinity of the right end in FIG. In addition, the upper end of the position shifted slightly to the left from the right end of the second lever 53 is connected to the lower end of the upper base portion 51 via the connecting portion 58. Furthermore, the vicinity of the left end of the second lever 53 is connected to the sensor mounting portion 59. The sensor mounting portion 59 is a thin plate-like beam, and has an upper end connected to the upper base portion 51 and a lower end connected to the second lever 53.

<Operation of displacement magnifying mechanism 50>
FIG. 8B shows a state in which the strain gauge 60 is attached to the displacement magnifying mechanism 50 in FIG.

  As shown in FIG. 8B, the first lever 52 of the displacement magnifying mechanism 50 is configured as a lever having the connecting portion 55 as a force point 55A, the connecting portion 56 as a first fulcrum 56A, and the connecting portion 57 as an action point. Yes. The second lever 53 of the displacement magnifying mechanism 50 is configured as a lever having the connecting portion 57 as a power point, the connecting portion 58 as a second fulcrum 58A, and a connecting portion with the sensor mounting portion 59 as an action point.

  The strain gauge 60 is attached to the surface of the sensor mounting portion 59 as shown in FIG.

  In the configuration of the brake pressure distribution measuring apparatus 10 shown in FIG. 1, when the disc rotor 20 is displaced by pressurization of the surface of the disc rotor 20 by the caliper 30 and the brake pad, a displacement 51A shown in FIG. In addition, a force in a direction of pushing down the upper base portion 51 from the upper side is applied to the displacement enlarging mechanism 50.

  Accordingly, a downward force is applied to the force point 55A of the first lever 52, the first lever 52 is inclined, and the connecting portion 57 is lifted. Here, since the distance between the first fulcrum 56A and the force point 55A is larger than the distance between the first fulcrum 56A and the force point 55A, a large amplified displacement is generated in the connection part 57.

  Further, since the connecting portion 57 that is the power point of the second lever 53 is displaced in the lifting direction, the second lever 53 is also tilted, and the sensor mounting portion 59 that is connected to the left end that is the operating point of the second lever 53. The lower end of is pulled down. Here, since the distance between the second fulcrum 58A and the connecting portion 57 is larger than the distance between the second fulcrum 58A and the sensor mounting portion 59, a further amplified large displacement is generated in the sensor mounting portion 59.

  That is, the displacement 51A generated in the disk rotor 20 is amplified in two stages by the first lever 52 and the second lever 53, and the lower end of the sensor mounting portion 59 is displaced by the output, so that the strain gauge 60 is distorted. . Therefore, the displacement 51A can be detected by the strain gauge 60.

  Since the disk rotor 20 has rigidity, the displacement generated in the disk rotor 20 by pressurization is very small. However, it is possible to detect the displacement with high sensitivity by enlarging the displacement 51A by the displacement enlarging mechanism 50 and transmitting it to the strain gauge 60.

  As for the displacement magnifying mechanism 50 shown in FIGS. 8A and 8B, as a result of analysis using a simple finite element method, the strain detected by the strain gauge 60 is magnified about 60 times. The result which can be estimated was obtained.

<Advantages of the brake pressure distribution measuring apparatus 10>
In the brake pressure distribution measuring apparatus 10 described above, the pressure distribution on the contact surface of the brake pad can be correctly calculated from the displacement generated in the disk rotor 20 by inverse analysis. Therefore, there is no need to incorporate a sensor in the brake pad as in the past, or to sandwich the sensor in the contact surface between the brake pad and the disc rotor, and measurement can be performed under the same conditions as the actual brake operating environment. . Moreover, by performing measurement using the outer pad displacement sensor 25 and the inner pad displacement sensor 26, the circumferential direction of each of the outer and inner pad sliding surfaces of the disk rotor 20 is individually determined. The pressure distribution can be measured.

<Description of modification>
<Modification of processing procedure>
FIG. 14 shows a modification of the processing procedure in the brake pressure distribution measuring apparatus 10 according to the embodiment of the present invention. That is, FIG. 14 shows a modification of the processing procedure shown in FIG. Further, in FIG. 14, the steps corresponding to those in FIG.

  In the modification shown in FIG. 14, it is assumed that the displacement SG02 data obtained in steps S13 and S14 in FIG. 7 is measured in advance and stored on the database DB2. Accordingly, steps S13 and S14 of FIG. 7 are omitted in the procedure of FIG. And in each step S15 of FIG. 14, S17, the calculation process is performed using the data of displacement SG01 on measurement data log DB1, and the data of displacement SG02 on database DB2.

<Modification of stiffness adjustment>
In the disk rotor 20 shown in FIG. 2, holes that are perforated on the outer surface of the outer disk plate 21 and the inner disk plate 22 are used as the rigidity adjusting portions 21a and 22a. It is done. For example, the number and size of holes to be drilled can be changed as necessary. Further, for example, in the outer disk plate 21, a concave portion in the thickness direction is formed on the wall surface at a location facing the detection surface of the outer pad displacement sensor 25, or the inner disk plate 22 has a detection surface of the inner pad displacement sensor 26. It is also conceivable to reduce the rigidity by forming a concave portion in the thickness direction on the wall surface of the opposite location.

<Modification of sensor structure>
The sensor structure of the modification is shown in FIGS. 15 (A) and 15 (B). FIG. 15A and FIG. 15B show different displacement states. Further, the Z direction in FIGS. 15A and 15B represents the thickness direction of the disk rotor 20B, and the upper side in the figure indicates the outer side, and the lower side indicates the inner side.

  The outer pad displacement sensor 25B shown in FIGS. 15 (A) and 15 (B) has an isosceles triangle cross-sectional shape, and the positions of the three vertices of the isosceles triangle are detected by the detector 25Ba, Assigned as support portions 25Bb and 25Bc. The outer pad displacement sensor 25B can detect the relative displacement of the position of the detecting portion 25Ba with respect to the positions of the supporting portions 25Bb and 25Bc.

  The outer pad displacement sensor 25B is disposed inside a circular sensor installation space 27 formed in the disk rotor 20B, the detection portion 25Ba faces the outer surface 20Ba, and the support portions 25Bb and 25Bc face the inner surface 20Bb. It is fixed in the state to do. In addition, the detection unit 25Ba is arranged in a state of being opposed to a portion having the smallest thickness of the minute displacement portion 20Bc, and the support portions 25Bb and 25Bc are in a state of being opposed to a position slightly away from the portion having the smallest thickness of the minute displacement portion 20Bd. Has been placed.

  As shown in FIG. 15A, when the pressing force F1 is applied to the outer surface 20Ba of the disk rotor 20B in the direction from the top to the bottom, the largest displacement occurs at the position where the thickness of the minute displacement portion 20Bc is the smallest. Since the detecting portion 25Ba is arranged at this location, the outer pad displacement sensor 25B can detect this displacement with high sensitivity.

  On the other hand, as shown in FIG. 15B, when the pressing force F2 is applied to the inner surface 20Bb of the disk rotor 20B in the direction from the bottom to the top, the largest displacement occurs at the place where the thickness of the minute displacement portion 20Bd is the smallest. To do. However, since the support portions 25Bb and 25Bc are arranged at positions where the displacement is large, the sensitivity when the outer pad displacement sensor 25B detects this displacement is relatively smaller than the outer displacement. .

  That is, even if the rigidity of the disk rotor 20 is not adjusted as described above, the outer pad displacement sensor 25B adopts a special structure as shown in FIGS. 15 (A) and 15 (B). The detection sensitivity of the sensor can obtain different characteristics between the displacement on the outer surface 20Ba side and the displacement on the inner surface 20Bb side.

  Further, for example, if the outer pad displacement sensor 25B shown in FIGS. 15A and 15B is disposed with the isosceles triangles arranged in opposite directions, the detection sensitivity to the displacement of the outer surface 20Ba is reduced. The detection sensitivity with respect to the displacement of the inner surface 20Bb is improved. Therefore, a sensor structure similar to that shown in FIGS. 15A and 15B can be employed for the inner pad displacement sensor 26 described above.

Here, the features of the above-described embodiment of the brake pressure distribution measuring method and the brake pressure distribution measuring apparatus according to the present invention will be summarized and listed in the following [1] to [9], respectively.
[1] A rotating body (disk rotor 20) having a first side surface portion (outer disk plate 21) and a second side surface portion (inner disk plate 22), the first side surface portion, and the second side surface portion. Brake pressure distribution for measuring the pressure distribution to the rotating body due to the pressing of the movable part in a brake system to be measured, including a movable part (caliper 30) that can press the rotating body in contact with Measuring method,
A plurality of displacement sensors (outer pad displacement sensor 25, inner pad displacement sensor 26) are installed between the first side surface portion and the second side surface portion,
The rotating body is formed in a state in which the first side surface portion and the second side surface portion have different rigidity for each position where the plurality of displacement sensors are installed,
Using the plurality of displacement sensors, each of the first side surface portion and the second side surface portion on the rotating body along the pressing direction of the movable portion in a state where the rotating body is rotating. Measure the minute displacement of the shape at (Steps S12, S14),
Based on the micro displacement of the shape of the first side surface portion obtained by the measurement and the micro displacement of the second side surface portion, the pressure distribution in the first side surface portion by the analysis by the computer, and the second Calculating the pressure distribution in the side surface part (step S17),
Brake pressure distribution measuring method characterized by the above.

[2] Based on the minute displacement of the shape of the rotating body obtained by the measurement, the pressure distribution to the rotating body is calculated by inverse analysis.
The brake pressure distribution measuring method according to [1] above, wherein

[3] An opening is provided in one of the first side surface and the second side surface facing the displacement sensor at each position where the plurality of displacement sensors are installed on the rotating body. Alternatively, the rigidity is lowered by forming one or more holes (rigidity adjusting portions 21a, 22a).
The brake pressure distribution measuring method according to [1] or [2] above, wherein

[4] A rotating body having a first side surface portion and a second side surface portion, and a movable portion capable of pressing the rotating body in contact with the first side surface portion and the second side surface portion. In the brake system to be measured, a brake pressure distribution measuring method for measuring the pressure distribution to the rotating body due to the pressing of the movable part,
Installing a plurality of displacement sensors between the first side surface portion and the second side surface portion;
Structure in which the displacement sensor has different sensitivity to displacement between the first side surface portion (outer surface 20Ba) and the second side surface portion (inner surface 20Bb) (see FIGS. 15A and 15B) Hold
Using the plurality of displacement sensors, each of the first side surface portion and the second side surface portion on the rotating body along the pressing direction of the movable portion in a state where the rotating body is rotating. Measure the small displacement of the shape at
Based on the micro displacement of the shape of the first side surface portion obtained by the measurement and the micro displacement of the second side surface portion, the pressure distribution in the first side surface portion by the analysis by the computer, and the second Calculate the pressure distribution at the side part,
Brake pressure distribution measuring method characterized by the above.

[5] The displacement sensor (outer pad displacement sensor 25B) applies the same force to the first side surface portion and the second side surface portion with respect to the first side surface portion and the second side surface portion. Having a structure in which the displacement amounts are different from each other when pressed with
The brake pressure distribution measuring method according to [4] above, wherein

[6] A rotating body (disk rotor 20) having a first side surface (outer disk plate 21) and a second side surface (inner disk plate 22), the first side surface, and the second side surface. Brake pressure distribution for measuring the pressure distribution to the rotating body due to the pressing of the movable part in a brake system to be measured, including a movable part (caliper 30) that can press the rotating body in contact with A measuring device (10),
A plurality of displacement sensors (outer pad displacement sensor 25, inner pad displacement sensor 26) installed between the first side surface portion and the second side surface portion;
In a state where the rotating body is in a rotational motion, a minute displacement of a shape in each of the first side surface portion and the second side surface portion of the rotating body along the pressing direction of the movable portion is detected by the displacement sensor. A data measurement unit (data logger 70) to be acquired based on the output of
A pressure distribution calculating unit (calculating unit 80) that calculates data of pressure distribution to the rotating body by inverse analysis based on data representing a minute displacement of the shape of the rotating body acquired by the data measuring unit;
The rotating body is formed in a state in which the first side surface portion and the second side surface portion have different rigidity for each position where the plurality of displacement sensors are installed,
The pressure distribution calculation unit calculates a pressure distribution in the first side surface portion and a pressure distribution in the second side surface portion, respectively.
Brake pressure distribution measuring device.

[7] The rotating body is rigid at either one of the first side surface portion and the second side surface portion facing the displacement sensor at each position where the plurality of displacement sensors are installed. One or more openings or holes (rigidity adjusting portions 21a, 22a) for lowering
The brake pressure distribution measuring apparatus according to [6] above, wherein

[8] The first displacement sensor (outer pad displacement sensor 25) included in the plurality of displacement sensors is fixed to the first side surface portion (inner disk plate 22), and the detection surface is the second side surface. Is disposed at a position facing the portion (outer disk plate 21),
The second displacement sensor (inner pad displacement sensor 26) included in the plurality of displacement sensors is fixed to the second side surface portion (outer disk plate 21) and the detection surface is the first side surface portion (inner Disposed at a position facing the disk plate 22),
The brake pressure distribution measuring device according to [6] or [7] above, wherein

[9] A rotating body having a first side surface portion and a second side surface portion, and a movable portion capable of pressing the rotating body in contact with the first side surface portion and the second side surface portion. In the brake system to be measured, a brake pressure distribution measuring device for measuring the pressure distribution to the rotating body due to the pressing of the movable part,
A plurality of displacement sensors installed between the first side surface portion and the second side surface portion;
In a state where the rotating body is in a rotational motion, a minute displacement of a shape in each of the first side surface portion and the second side surface portion of the rotating body along the pressing direction of the movable portion is detected by the displacement sensor. A data measurement unit to acquire based on the output of
A pressure distribution calculating unit that calculates data of pressure distribution to the rotating body by inverse analysis based on data representing a minute displacement of the shape of the rotating body acquired by the data measuring unit;
The displacement sensor has a structure in which the first side surface portion (outer surface 20Ba) and the second side surface portion (inner surface 20Bb) have different sensitivity to displacement (see FIGS. 15A and 15B). )
The pressure distribution calculation unit calculates a pressure distribution in the first side surface portion and a pressure distribution in the second side surface portion, respectively.
Brake pressure distribution measuring device.

DESCRIPTION OF SYMBOLS 10 Brake pressure distribution measuring device 20, 20B Disc rotor 20a Center opening part 20Ba Outer surface 20Bb Inner surface 20Bc, 20Bd Minute displacement part 21 Outer disk board 22 Inner disk board 21a, 22a Rigidity adjustment part 21b, 22b Displacement sensor fixing | fixed part 23 Gap 24 Support part 25, 25B Displacement sensor for outer pad 25Ba Detection part 25Bb, 25Bc Support part 26 Displacement sensor for inner pad 27 Sensor installation space 30 Caliper 31A Brake pad (normal type)
40 Hydraulic Gauge 50 Displacement Enlarging Mechanism 51 Upper Base 52 First Lever 53 Second Lever 54 Lower Base 55, 56, 57, 58 Connection 59 Sensor Mount 51A Displacement 55A Force 56A First Support 58A Second Support 60 Strain gauge 70 Data logger 80 Calculation unit 90 Amplifier 95 Optical encoder 101 Known point load 102 Unknown pressure distribution on each sliding surface 103 Rotor displacement measurement result 104 Inverse analysis

Claims (9)

A measurement object including: a rotating body having a first side surface portion and a second side surface portion; and a movable portion capable of pressing the rotating body in contact with the first side surface portion and the second side surface portion; A brake pressure distribution measuring method for measuring a pressure distribution to the rotating body due to the pressing of the movable part,
Installing a plurality of displacement sensors between the first side surface portion and the second side surface portion;
The rotating body is formed in a state in which the first side surface portion and the second side surface portion have different rigidity for each position where the plurality of displacement sensors are installed,
Using the plurality of displacement sensors, each of the first side surface portion and the second side surface portion on the rotating body along the pressing direction of the movable portion in a state where the rotating body is rotating. Measure the small displacement of the shape at
Based on the micro displacement of the shape of the first side surface portion obtained by the measurement and the micro displacement of the second side surface portion, the pressure distribution in the first side surface portion by the analysis by the computer, and the second Calculate the pressure distribution at the side part,
Brake pressure distribution measuring method characterized by the above. Based on the minute displacement of the shape of the rotating body obtained by the measurement, to calculate the pressure distribution to the rotating body by inverse analysis,
The brake pressure distribution measuring method according to claim 1. An opening or a hole is formed in one of the first side surface portion and the second side surface portion facing the displacement sensor at each position where the plurality of displacement sensors are installed in the rotating body. Reducing the rigidity by forming one or more,
The brake pressure distribution measuring method according to claim 1 or 2, characterized by the above. A measurement object including: a rotating body having a first side surface portion and a second side surface portion; and a movable portion capable of pressing the rotating body in contact with the first side surface portion and the second side surface portion; A brake pressure distribution measuring method for measuring a pressure distribution to the rotating body due to the pressing of the movable part,
Installing a plurality of displacement sensors between the first side surface portion and the second side surface portion;
The displacement sensor has a structure that makes the sensitivity to displacement in the first side surface portion and the second side surface portion different,
Using the plurality of displacement sensors, each of the first side surface portion and the second side surface portion on the rotating body along the pressing direction of the movable portion in a state where the rotating body is rotating. Measure the small displacement of the shape at
Based on the micro displacement of the shape of the first side surface portion obtained by the measurement and the micro displacement of the second side surface portion, the pressure distribution in the first side surface portion by the analysis by the computer, and the second Calculate the pressure distribution at the side part,
Brake pressure distribution measuring method characterized by the above. The displacement sensor has different displacement amounts when the first side surface portion and the second side surface portion are pressed with the same force against the first side surface portion and the second side surface portion, respectively. Having a structure in contact with,
The brake pressure distribution measuring method according to claim 4, wherein: A measurement object including: a rotating body having a first side surface portion and a second side surface portion; and a movable portion capable of pressing the rotating body in contact with the first side surface portion and the second side surface portion; In the brake system, a brake pressure distribution measuring device for measuring the pressure distribution to the rotating body due to the pressing of the movable part,
A plurality of displacement sensors installed between the first side surface portion and the second side surface portion;
In a state where the rotating body is in a rotational motion, a minute displacement of a shape in each of the first side surface portion and the second side surface portion of the rotating body along the pressing direction of the movable portion is detected by the displacement sensor. A data measurement unit to acquire based on the output of
A pressure distribution calculating unit that calculates data of pressure distribution to the rotating body by inverse analysis based on data representing a minute displacement of the shape of the rotating body acquired by the data measuring unit;
The rotating body is formed in a state in which the first side surface portion and the second side surface portion have different rigidity for each position where the plurality of displacement sensors are installed,
The pressure distribution calculation unit calculates a pressure distribution in the first side surface portion and a pressure distribution in the second side surface portion, respectively.
Brake pressure distribution measuring device. The rotating body lowers the rigidity at one of the first side surface portion and the second side surface portion facing the displacement sensor at each position where the plurality of displacement sensors are installed. One or more openings or holes are formed,
The brake pressure distribution measuring device according to claim 6. The first displacement sensor included in the plurality of displacement sensors is fixed to the first side surface portion and is arranged at a position where the detection surface faces the second side surface portion,
The second displacement sensor included in the plurality of displacement sensors is fixed to the second side surface portion, and is disposed at a position where the detection surface faces the first side surface portion.
The brake pressure distribution measuring device according to claim 6 or 7, characterized by the above. A measurement object including: a rotating body having a first side surface portion and a second side surface portion; and a movable portion capable of pressing the rotating body in contact with the first side surface portion and the second side surface portion; In the brake system, a brake pressure distribution measuring device for measuring the pressure distribution to the rotating body due to the pressing of the movable part,
A plurality of displacement sensors installed between the first side surface portion and the second side surface portion;
In a state where the rotating body is in a rotational motion, a minute displacement of a shape in each of the first side surface portion and the second side surface portion of the rotating body along the pressing direction of the movable portion is detected by the displacement sensor. A data measurement unit to acquire based on the output of
A pressure distribution calculating unit that calculates data of pressure distribution to the rotating body by inverse analysis based on data representing a minute displacement of the shape of the rotating body acquired by the data measuring unit;
The displacement sensor has a structure that varies sensitivity to displacement in the first side surface portion and the second side surface portion,
The pressure distribution calculation unit calculates a pressure distribution in the first side surface portion and a pressure distribution in the second side surface portion, respectively.
Brake pressure distribution measuring device.