Detector, and method for manufacturing detector

Abstract

To provide a detector that can prevent a change in the shape of a sensor substrate as much as possible even when the shape of a hub bearing is changed, and a method for manufacturing the detector.SOLUTION: A detector is applied to a wheel unit. The wheel unit comprises a hub bearing 40 including an outer ring member and an inner ring member. The detector comprises: a target member 80 that is provided on a flange part 62 of the inner ring member, a sensor substrate 100, and a substrate attachment member 120. A knuckle 15 of a vehicle is formed with a through hole 15a to which an outside cylindrical part 51 of the outer ring member is fitted. The substrate attachment member 120 is arranged between the knuckle 15 and the target member 80 in an axial direction. A portion on a second plate surface 102b side of the sensor substrate 100 is attached to a portion of the substrate attachment member 120 facing the target member 80 in the axial direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a detection device and a method for manufacturing a detection device. [Background technology]

[0002] A hub bearing with a sensor is known that detects displacement by utilizing the relative displacement of an inner ring member with respect to an outer ring member of the hub bearing. A hub bearing with a sensor is described in, for example, Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-275508 Summary of the Invention [Problem to be solved by the invention]

[0004] A detection device applicable to a mechanical device is known. The mechanical device includes a rotating body and a hub bearing. The hub bearing includes a first bearing member (e.g., an outer ring member), a second bearing member (e.g., an inner ring member), and rolling elements. The first bearing member has a first cylindrical portion extending in the axial direction, which is the direction of the central axis of rotation of the hub bearing, and is fixed to a base portion (e.g., a knuckle) of the mechanical device. The second bearing member has a second cylindrical portion provided at a position facing the first cylindrical portion in a radial direction perpendicular to the axial direction, and a flange portion extending radially from the second cylindrical portion and to which the rotating body is fixed. Rolling elements are provided between the first cylindrical portion and the second cylindrical portion. As a result, the hub bearing rotatably supports the rotating body relative to the base portion.

[0005] The detection device includes a detection target portion and a sensor substrate as components for detecting displacement or force. The detection target portion is provided on the flange portion on the second cylindrical portion side in the axial direction. The detection target portion forms an annular shape extending circumferentially of the second cylindrical portion around the central axis of rotation. The sensor substrate has a first plate surface facing the detection target portion in the axial direction, and a second plate surface that is the back side of the first plate surface. The sensor substrate outputs a voltage signal corresponding to the relative displacement of the detection target portion with respect to the sensor substrate. The displacement or force is detected based on the output voltage signal.

[0006] When the type of mechanical device to which the detection device is to be installed changes, the shape of the hub bearing may change. In this case, the fixing method of the sensor board must be selected according to the shape, and there is a concern that the shape of the sensor board may need to be changed depending on the shape.

[0007] A primary object of the present disclosure is to provide a detection device and a method for manufacturing the detection device that can minimize changes in the shape of the sensor substrate even when the shape of the hub bearing changes. [Means for solving the problem]

[0008] The present disclosure provides a detection device applied to a mechanical device, The mechanical device is A rotating body; a hub bearing that supports the rotating body rotatably relative to a base portion; Equipped with The hub bearing is a first bearing member having a first cylindrical portion extending in an axial direction along the rotational center axis of the hub bearing and fixed to the base portion; a second bearing member including a second cylindrical portion provided at a position facing the first cylindrical portion in a radial direction perpendicular to the axial direction, and a flange portion extending from the second cylindrical portion in the radial direction and to which the rotating body is fixed; a rolling element provided between the first cylindrical portion and the second cylindrical portion; the second bearing member is rotatably supported relative to the base portion, a detection target portion provided on the flange portion on the base portion side in the axial direction; a sensor substrate having a first plate surface facing the detection target in the axial direction and a second plate surface that is the reverse side of the first plate surface; a substrate mounting member to which the sensor substrate is attached and which is fixed to the first bearing member; Equipped with the detection target portion has an annular shape extending in a circumferential direction of the second cylindrical portion, the annular shape being centered on the central axis of rotation, the sensor substrate outputs a voltage signal corresponding to a relative displacement of the detection target portion with respect to the sensor substrate; the substrate mounting member is disposed between the base portion and the detection target portion in the axial direction with the first cylindrical portion fixed to the base portion, The second plate surface side of the sensor board is attached to a portion of the board attachment member that faces the detection target in the axial direction.

[0009] The detection device of the present disclosure includes a substrate mounting member fixed to a first bearing member. The substrate mounting member is arranged axially between the base and the detection target, with the first cylindrical portion fixed to the base. In this arrangement, the second plate surface side of the sensor substrate is attached to a portion of the substrate mounting member that faces the detection target in the axial direction.

[0010] In this way, the relative position of the sensor board and the detection target can be determined by the board mounting member fixed to the first bearing member. This reduces the effect of changes in the shape of the hub bearing on the mounting mode of the sensor board, which is required to position the first plate surface of the sensor board facing the detection target. As a result, even if the shape of the hub bearing changes depending on the type of mechanical device, changes in the shape of the sensor board can be minimized. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a perspective view of a wheel unit according to the first embodiment. [Figure 2] FIG. [Figure 3] FIG. 10 is an enlarged view of a portion near the hub bearing of the wheel unit. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 2 is a diagram showing the electrical configuration of a sensor substrate and a processing unit. [Figure 8] FIG. [Figure 9] 9 is a plan view of the board mounting member of FIG. 8 as seen from the back side. [Figure 10] FIG. 4 is a perspective view of a hub bearing and a board mounting member. [Figure 11] FIG. 10 is a perspective view showing how the dust cover, the board mounting member, and the hub bearing are attached to the knuckle. [Figure 12] 10A and 10B are diagrams for explaining how the circumferential position of the coil can be shifted by changing the shape of the board mounting member. [Figure 13] FIG. 10 is a plan view of a board mounting member according to a second embodiment. [Figure 14] FIG. 14 is a plan view of the board mounting member of FIG. 13 as seen from the back side. [Figure 15] FIG. 10 is a perspective view showing a dust cover according to a third embodiment. [Figure 16] FIG. 16 is a perspective view of the dust cover of FIG. 15 as seen from the back side. [Figure 17] FIG. 10 is a plan view of a board mounting member according to a fourth embodiment. [Figure 18] FIG. [Figure 19] FIG. 2 is a diagram showing a coil installation area and a coil non-installation area. [Figure 20] FIG. 11 is a plan view of a board mounting member according to a fifth embodiment. [Figure 21] FIG. 13 is a plan view of a board mounting member according to a sixth embodiment. [Figure 22] Cross-sectional view taken along line 22-22 in Figure 21. [Figure 23] FIG. 10 is a plan view of a board mounting member according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Several embodiments will be described with reference to the drawings. In several embodiments, functionally and / or structurally corresponding and / or associated parts may be assigned the same reference numerals or reference numerals that differ in the hundredth or more digit. For corresponding and / or associated parts, reference may be made to the descriptions of other embodiments.

[0013] First Embodiment A first embodiment of a detection device according to the present disclosure will be described below with reference to the drawings. The detection device of this embodiment is configured to be able to calculate the force acting on wheels (drive wheels or driven wheels) as rotating bodies. A vehicle equipped with wheels is, for example, a four-wheeled passenger vehicle (for example, private or commercial use) having two front wheels and two rear wheels. However, the vehicle is not limited to this, and may be a vehicle other than a four-wheeled vehicle, such as a two-wheeled vehicle. Furthermore, the use of the vehicle is not limited to passenger use.

[0014] The wheel unit 10 as a mechanical device will be described using Figures 1 to 5. Figure 1 is a perspective cross-sectional view in which the wheel unit 10 is partially cut away, and Figure 2 is a cross-sectional view in which the wheel unit 10 is cut along a plane that passes through the center of rotation of the wheel unit 10 and extends vertically. Figure 3 is a partially enlarged view of Figure 2. Figures 4 and 5 are exploded perspective views of the wheel unit 10.

[0015] As shown in Figures 1 and 2, the wheel unit 10 includes a wheel 11 and a tire 14 that constitute a wheel. The wheel 11 includes a cylindrical rim portion 12 and a disc portion 13 provided at the outer end of the rim portion 12 in the vehicle width direction. The disc portion 13 includes a disc mounting portion 18 located in the center of the disc portion 13, and spoke portions 19 that extend radially from the disc mounting portion 18 to the rim portion 12. The tire 14 is mounted on the outer periphery of the rim portion 12.

[0016] As shown in Figures 1 to 5, the wheel unit 10 includes a brake device 20 and a hub bearing 40. The brake device 20 is a disc-type friction braking device and includes a disc rotor 21 that is disk-shaped overall, and a brake caliper 33. The brake caliper 33 is operated by hydraulic pressure, an electric signal, or the like, and includes a pair of disc pads that come into contact with the disc rotor 21 to generate braking force, a piston that presses the disc pads against the disc rotor 21, and a caliper body that supports the brake pads and the piston. As shown in Figure 4, the brake caliper 33 is fixed to the knuckle 15, which is its base, by a bolt 34.

[0017] In the following, the direction in which the rotational center axis of the hub bearing 40 (specifically, for example, the inner ring member 60 of the hub bearing 40) extends is referred to as the axial direction, the direction extending radially from the rotational center axis is referred to as the radial direction, and the direction extending circumferentially around the rotational center axis is referred to as the circumferential direction.

[0018] The disc rotor 21 of this embodiment is a ventilated disc having an internal cavity for ventilation. The disc rotor 21 has a hat portion 22 and a sliding portion 23. The hat portion 22 is attached to the hub bearing 40. The hat portion 22 has a disk-shaped bottom surface portion 24 and a disc peripheral wall portion 25. A mounting hole 26 is formed in the center of the bottom surface portion 24. Bolt insertion holes 27 that axially penetrate the bottom surface portion 24 are formed in a circumferential direction around the mounting hole 26. The disc rotor 21 is connected to the hub bearing 40 using the mounting holes 26 and the bolt insertion holes 27. The disc peripheral wall portion 25 is cylindrical and extends from the outer circumferential edge of the bottom surface portion 24, forming the peripheral surface of the hat portion 22.

[0019] A sliding portion 23 is connected to the end of the disc peripheral wall portion 25 opposite the bottom surface portion 24. The sliding portion 23 is formed to protrude outward in an annular shape from the disc peripheral wall portion 25. The front and back surfaces of the sliding portion 23 form a pair of sliding surfaces that are pressed against by the disc pad.

[0020] The sliding portion 23 includes an inner disk portion 28, an outer disk portion 29 disposed on the outer side of the inner disk portion 28, and fins 30. The fins 30 connect the inner disk portion 28 and the outer disk portion 29 at multiple locations in the circumferential direction. The fins 30 extend radially, and the space surrounded by the inner disk portion 28, the outer disk portion 29, and the fins 30 forms an air passage penetrating in the radial direction (diameter direction). The air passage is a passage that extends from an air intake port 31 formed on the radially inner side of the sliding portion 23 to an air exhaust port 32 formed on the radially outer side.

[0021] The hub bearing 40 is a rolling bearing (specifically, a radial ball bearing) and includes an outer ring member 50 (corresponding to the "first bearing member"), an inner ring member 60 (corresponding to the "second bearing member"), and a plurality of rolling elements 41 (specifically, balls) arranged between the outer ring member 50 and the inner ring member 60. The hub bearing 40 of this embodiment has a structure in which the rolling elements 41 are arranged in two rows in the axial direction. Note that the hub bearing 40 may also be a radial roller bearing provided with rollers as the rolling elements 41.

[0022] The inner ring member 60 includes an inner cylindrical portion 61 (corresponding to a "second cylindrical portion") extending in the axial direction, and a flange portion 62 extending radially from a first end of the inner cylindrical portion 61 in the axial direction. A shaft insertion hole 63 is formed in the inner cylindrical portion 61, penetrating it in the axial direction. A spline is formed on the inner peripheral surface of the shaft insertion hole 63. A shaft (not shown) to which rotational power of a traveling power source such as a motor is transmitted is fitted in the shaft insertion hole 63.

[0023] The outer ring member 50 has an outer cylindrical portion 51 (corresponding to a "first cylindrical portion") provided at a position facing radially outward from the inner cylindrical portion 61. A rolling element 41 is provided between the outer cylindrical portion 51 and the inner cylindrical portion 61.

[0024] The flange portion 62 is disk-shaped and extends radially outward beyond the outer cylindrical portion 51. A plurality of bolt insertion holes 64, into which hub bolts 17 for fixing the wheel 11 are inserted, are formed in the flange portion 62 and aligned in the circumferential direction. In this embodiment, as shown in FIG. 5, for example, five hub bolts 17 are formed aligned in the circumferential direction. Therefore, five bolt insertion holes 64 are also formed.

[0025] The wheel unit 10 is provided with a dust cover 70, which is a heat shield. The dust cover 70 is provided on the inner side in the vehicle width direction of the hub bearing 40 and the sliding portion 23 of the disc rotor 21. The dust cover 70 extends radially outward beyond the outer peripheral edge of the sliding portion 23.

[0026] The wheel unit 10 is equipped with a detection device. The detection device is provided in the inner space of the wheel 11 and includes a target member 80 (corresponding to the "detection target") and a sensor board 100. The detection device is a device for detecting the rotational speed of the wheel consisting of the wheel 11 and tire 14, the lateral force Fy acting between the ground contact surface (ground) GL and the wheel (specifically, the tire 14), and the force acting between the ground contact surface GL and the wheel in a direction perpendicular to the ground contact surface GL (hereinafter referred to as the vertical load Fz). The direction in which the lateral force acts and the direction in which the vertical load acts are orthogonal. For example, the calculated rotational speed, lateral force, and vertical load are used in a control device (specifically, an ECU: Electronic Control Unit) provided in the vehicle to control the running of the vehicle, which is a moving object. The structure of the detection device will be described below.

[0027] The target member 80 is made of a metal material (e.g., aluminum or iron). The target member 80 has an annular shape extending in the circumferential direction around the central axis of rotation of the hub bearing 40. The target member 80 is provided in a position facing the sensor substrate 100 in the axial direction, without contacting the sensor substrate 100.

[0028] In this embodiment, the target member 80 is divided into two parts in the circumferential direction, as shown in Figures 4 and 5, more specifically, the two parts are divided into two parts with equal circumferential lengths. The reason for dividing the target member 80 is to facilitate the assembly of the target member 80 to the hub bearing 40. For example, the target member 80 can be attached to a completed hub bearing 40 later. Hereinafter, one of the divided parts of the target member 80 will be referred to as a first divided part 80A, and the other part will be referred to as a second divided part 80B.

[0029] The target member 80 has protrusions 81, which protrude inward in the vehicle width direction in the axial direction and have flat surfaces, lined up in the circumferential direction. The flat surfaces between the protrusions 81 lined up in the circumferential direction are recesses 82. The protrusions 81 and recesses 82 are arranged alternately in the circumferential direction. In this embodiment, 12 pairs of protrusions 81 and recesses 82 are provided.

[0030] 6, LCi indicates the center axis of the inner ring member 60. In this embodiment, the angle α1 formed by the center axis LCi and an axis passing through one circumferential end of the protruding portion 81 and the axis passing through the center axis LCi and the other circumferential end of the protruding portion 84 is equal to the angle α2 formed by the axis passing through the center axis LCi and one circumferential end of the recessed portion 82 and the axis passing through the center axis LCi and the other circumferential end of the recessed portion 82. Therefore, the circumferential length of the multiple protruding portions 81 and the circumferential length of the multiple recessed portions 82 are equal to each other.

[0031] Next, a configuration for fixing the target member 80 to the flange portion 62 will be described.

[0032] 5, a plurality of bolt insertion holes 62a (six are shown in the figure) that penetrate in the axial direction are formed in the flange portion 62 and aligned in the circumferential direction. The bolt insertion holes 62a are formed in positions that are shifted in the circumferential direction from the protruding positions of the hub bolts 17. The flange portion 62 is formed with a mounting surface 62b that is a flat surface with which the bottom surface portion 24 of the disc rotor 21 abuts (specifically, comes into surface contact with).

[0033] Each of the divided members 80A, 80B constituting the target member 80 has a female threaded hole 86 extending in the axial direction formed on the side opposite to the surface on which the convex portions 81 and concave portions 82 are formed, and a bolt 83 is inserted through the female threaded hole 86. With the divided members 80A, 80B abutting against the flange portion 62 and the bolt 83 inserted through the bolt insertion hole 62a, the male thread of the bolt 83 is screwed into the female threaded hole 86. This fixes each of the divided members 80A, 80B to the flange portion 62. Note that the side surface portion 85 of the target member 80 does not protrude beyond the flange portion 62 when viewed from the front of the mounting surface 62b. This makes it possible to suppress an increase in the radial dimension of the sensor-equipped bearing module.

[0034] Next, a configuration for fixing the wheel 11 and the disc rotor 21 to the flange portion 62 will be described.

[0035] As shown in Fig. 3, the disc mounting portion 18 has a bolt insertion hole 18a formed therethrough in the axial direction. With the bottom surface portion 24 and the disc mounting portion 18 overlapping the mounting surface 62b of the flange portion 62, a hub bolt 17 is inserted into the bolt insertion holes 27, 18a. A nut 35 is threaded onto the hub bolt 17, thereby fixing the disc mounting portion 18 and the disc rotor 21 to the hub bearing 40. This makes the target member 80, disc rotor 21, and inner ring member 60 coaxial, and causes the target member 80, disc rotor 21, and wheel 11 to rotate integrally.

[0036] The target member 80 is provided radially inward of the disk peripheral wall portion 25 that constitutes the disk rotor 21. This allows the disk rotor 21 to protect against foreign matter from the outside.

[0037] Next, the sensor substrate 100 will be described.

[0038] The sensor substrate 100 is a so-called eddy current inductive sensor. The sensor substrate 100 is disposed such that its plate surface extends in the vertical direction. The sensor substrate 100 is disposed in an arrangement space that is adjacent to the flange portion 62 on the inner side in the vehicle width direction and that is radially outward of the inner cylindrical portion 61 and the outer cylindrical portion 51. In the arrangement space, a target member 80 is disposed at a position facing the sensor substrate 100 in the axial direction. In this embodiment, the sensor substrate 100 is disposed at a position facing the lower end or the upper end of the target member 80 in the axial direction. The sensor substrate 100 is disposed between the flange portion 62 and the hub mounting portion 52.

[0039] The sensor substrate 100 has an arc shape that follows the target member 80. As shown in FIG. 7, the sensor substrate 100 includes an excitation coil 110 and a receiving coil. In this embodiment, the receiving coils are a first receiving coil 111 and a second receiving coil 112. Each of the coils 110 to 112 is a planar coil that follows the surface of the sensor substrate 100. The sensor substrate 100 is a multi-layer substrate. Each of the coils 110 to 112 is formed by wiring patterns, vias, etc., formed on each layer of the sensor substrate 100.

[0040] The sensor substrate 100 includes an excitation circuit 113 that supplies a high-frequency excitation voltage to the excitation coil 110, and a receiving circuit 114. When an excitation voltage is supplied to the excitation coil 110, an excitation current flows through the excitation coil 110, and a voltage having the same or equivalent frequency as the excitation voltage is induced in each of the coils 111 and 112. The receiving circuit 114 detects output voltage signals at both ends of each of the coils 111 and 112. When an excitation voltage is supplied to the excitation coil 110, the phase difference between the first output voltage signal of the first receiving coil 111 and the output voltage signal of the second receiving coil 112 is 90 degrees.

[0041] In this embodiment, the coils 110 to 112 have the same circumferential center position. The circumferential center position of each of the coils 110 to 112 is located opposite the upper end or lower end of the target member 80 in the axial direction.

[0042] The sensor board 100 is provided with a connector 115 electrically connected to the excitation circuit 113 and the receiving circuit 114. The connector 115 is electrically connected to a processing unit 117 via a cable 116. The processing unit 117 may be provided on the vehicle body or may be built into the wheel unit 10.

[0043] The processing unit 117 includes a CPU (Central Processing Unit). The functions of the processing unit 117 can be provided by software stored in a physical memory device and a computer executing the software, by software alone, by hardware alone, or by a combination of these. For example, if the microcomputer of the processing unit 117 is provided by a hardware electronic circuit, the function can be provided by a digital circuit including multiple logic circuits or an analog circuit. For example, the microcomputer executes a program stored in a non-transitory tangible storage medium serving as a storage unit of the microcomputer. The program includes, for example, a program for a load calculation process, which will be described later. A set of instructions constituting the program is executed to perform a method corresponding to the program. The storage unit is, for example, a non-volatile memory. The program stored in the storage unit can be updated via a communication network such as the Internet, for example, via OTA (Over The Air) or the like.

[0044] Next, the load calculation process will be described.

[0045] 2, when a lateral force Fy acts on the wheel, the inclination θ of the central axis LCi of the inner ring member 60 relative to the central axis LCo of the outer ring member 50 increases. In this case, the axial distance between each of the coils 111, 112 and the target member 80 changes, and the amplitude of the output voltage signal of each of the coils 111, 112 changes. The processing unit 117 calculates the axial displacement ΔY of the target member 80 based on this change in amplitude, and performs processing to calculate the lateral force Fy based on the calculated axial displacement ΔY.

[0046] On the other hand, when a vertical load Fz acts on the wheel, the central axis LCi of the inner ring member 60 is displaced in a direction perpendicular to the central axis LCo of the outer ring member 50. As a result, the target member 80 fixed to the flange portion 62 is also displaced. In this case, the sensor board 100 is configured so that the amplitude of the output voltage signals of the first receiving coil 111 and the second receiving coil 112 changes. Based on this change in amplitude, the processing unit 117 calculates the displacement of the target member 80 in a direction perpendicular to the axial direction and the vehicle length direction (hereinafter referred to as the vertical displacement ΔZ), and performs processing to calculate the vertical load Fz based on the calculated vertical displacement ΔZ.

[0047] The processing unit 117 calculates the rotation angle of the wheel based on the output signal of at least one of the first receiving coil 111 and the second receiving coil 112. The processing unit 117 calculates the rotation speed of the wheel based on the calculated rotation angle. Specifically, for example, the processing unit 117 may calculate the rotation speed based on the time differential value of the rotation angle.

[0048] The sensor substrate 100 and the load calculation process are described in, for example, Japanese Patent Application Laid-Open No. 2023-130285.

[0049] Next, a configuration for fixing the sensor board 100 to the outer ring member 50 of the hub bearing 40 will be described with reference to FIGS. 2 to 5 and 8 to 11.

[0050] The wheel unit 10 includes a board mounting member 120 as a component for fixing the sensor board 100 to the outer ring member 50. The board mounting member 120 is plate-shaped and annular. The board mounting member 120 is made of, for example, synthetic resin or a metal material (e.g., aluminum). A circular (specifically, perfect circular) through-hole 122 is formed in the center of the board mounting member 120. The through-hole 122 penetrates in the axial direction from the first plate surface 121a to the second plate surface 121b of the board mounting member 120, and the outer cylindrical portion 51 is fitted into the through-hole 122.

[0051] A protrusion 130 (corresponding to an "attachment portion") to which the sensor substrate 100 is attached is formed on the first plate surface 121a of the substrate attachment member 120. The protrusion 130 extends from the first plate surface 121a toward the flange portion 62 in the axial direction. A plurality of protrusions 130 (three are illustrated in the figure) are formed spaced apart in the circumferential direction. Of the plurality of protrusions 130, the protrusions 130 at both ends in the circumferential direction are protrusions for attaching both ends of the sensor substrate 100 in the circumferential direction. Of the plurality of protrusions 130, the protrusion 130 sandwiched between the protrusions 130 at both ends in the circumferential direction is a protrusion for attaching an intermediate portion of the sensor substrate 100 in the circumferential direction.

[0052] Each protrusion 130 has a bolt insertion hole 132 formed therein that penetrates in the axial direction and through which a board mounting bolt 131 is inserted. Meanwhile, the sensor board 100 has the same number of female screw holes 101 as the bolt insertion holes 132 formed therein, into which the male screws of the board mounting bolts 131 are screwed.

[0053] The board mounting member 120 and the sensor board 100 have a configuration that makes it easy to position the sensor board 100 relative to the board mounting member 120. More specifically, the sensor board 100 has a first plate surface 102a and a second plate surface 102b that is the back surface of the first plate surface 102a. Positioning pins 103 that extend axially toward the board mounting member 120 are provided at both circumferential ends of the second plate surface 102b. Of the multiple protrusions 130, the protrusions 130 at both circumferential ends are formed with pin holes 133 that extend axially and through which the positioning pins 103 are inserted.

[0054] By inserting the positioning pins 103 into the pin holes 133, the female screw holes 101 at both circumferential ends of the sensor board 100 are aligned with the bolt insertion holes 132 of the protrusions 130. In this aligned state, the board mounting bolts 131 are inserted into the bolt insertion holes 132 from the second plate surface 121b side of the board mounting member 120, and the male threads of the board mounting bolts 131 are screwed into the female screw holes 101. As a result, the sensor board 100 is fixed to the board mounting member 120 while maintaining a predetermined relative positional relationship between the sensor board 100 and the board mounting member 120. In this case, the plate surfaces of the sensor board 100 and the board mounting member 120 are parallel to each other. The sensor board 100 is supported by the protrusions 130 while spaced apart from the first plate surface 121a of the board mounting member 120.

[0055] When an excitation voltage is applied to the excitation coil 110 of the sensor board 100, a current flows through each of the coils 110-112, causing each of the coils 110-112 to generate heat. Therefore, it is desirable to provide a configuration for effectively cooling each of the coils 110-112. As shown in FIG. 3 , the sensor board 100 is disposed radially inward of the air intake 31 of the disc rotor 21. Furthermore, the sensor board 100 and the first plate surface 121a of the board mounting member 120 are separated by the protrusion 130, forming an air passage between the sensor board 100 and the first plate surface 121a. In this case, as the disc rotor 21 rotates, airflow is generated from this air passage toward the air intake 31. As a result, not only the first plate surface 121a of the sensor board 100 but also the second plate surface 121b can be cooled.

[0056] The board mounting member 120 is formed with bolt insertion holes 123 that penetrate from the first plate surface 121a to the second plate surface 121b and through which the bolts 16 are inserted. In this embodiment, three bolt insertion holes 123 are formed spaced apart in the circumferential direction.

[0057] An extension 124 extending axially toward the dust cover 70 is formed on the periphery of the through hole 122 of the board mounting member 120. The extension 124 is formed over the entire periphery of the periphery of the through hole 122.

[0058] The dust cover 70 includes a first wall portion 73, a connecting portion 74, and a second wall portion 75. The connecting portion 74 extends radially outward from the radially outer end portion of the first wall portion 73. The second wall portion 75 extends radially outward from the radially outer end portion of the connecting portion 74.

[0059] The first wall portion 73 of the dust cover 70 has a circular (specifically, perfect circular) through-hole 72 formed therein, which extends in a direction perpendicular to the plate surface of the first wall portion 73 and into which the extension portion 124 of the board mounting member 120 is fitted. The knuckle 15 has a circular (specifically, perfect circular) through-hole 15a formed therein, which extends in the axial direction and into which the outer cylindrical portion 51 of the outer ring member 50 is fitted.

[0060] A bolt insertion hole 71 through which the bolt 16 is inserted is formed in the first wall portion 73 of the dust cover 70. A bolt insertion hole 15b through which the bolt 16 is inserted is formed in the knuckle 15.

[0061] The hub bearing 40 has hub mounting portions 52, the number of which is the same as the number of bolt insertion holes 123. The hub mounting portions 52 are spaced apart in the circumferential direction. Each hub mounting portion 52 has a female screw hole 52a that penetrates in the axial direction and into which the bolt 16 is screwed. Each hub mounting portion 52 has a flat surface 52b that extends in a direction perpendicular to the axial direction.

[0062] In a front view of the plate surface of the board mounting member 120, the sensor board 100 and the bolt insertion holes 123 are arranged at positions where they do not overlap. Furthermore, in a front view of the plate surface of the board mounting member 120, the hub mounting portion 52 and the bolt insertion holes 123 are arranged at positions where they do not overlap in the circumferential direction. This prevents the sensor board 100 from interfering with the hub mounting portion 52 when the first plate surface 121a of the board mounting member 120, with the sensor board 100 attached, is brought into contact (specifically, surface contact) with the flat surface 52b of the hub mounting portion 52.

[0063] The hub bearing 40 and the board mounting member 120 are configured to align the central axis LCi of the inner ring member 60 of the hub bearing 40 with the center of a through hole 122 in the board mounting member 120. More specifically, as shown in FIG. 10 , a groove 53 extending in the axial direction is formed in the side surface of the outer ring member 50. Meanwhile, a positioning protrusion 125 extending in the axial direction is formed in the first plate surface 121a of the board mounting member 120. The positioning protrusion 125 is fitted into the groove 53, the first plate surface 121a of the board mounting member 120 abuts against the flat surface 52b, and the outer cylindrical portion 51 is fitted into the through hole 122. This aligns the central axis LCi of the inner ring member 60 with the center of the through hole 122, contributing to improved load calculation accuracy.

[0064] The board mounting member 120, the dust cover 70, and the knuckle 15 are provided with a configuration that facilitates relative positioning of the dust cover 70 and the knuckle 15 with respect to the board mounting member 120. More specifically, the knuckle 15 is provided with a positioning pin 15c that extends axially toward the board mounting member 120. The first wall portion 73 of the dust cover 70 is formed with a pin hole 76 that extends axially and through which the positioning pin 15c is inserted. The board mounting member 120 is formed with a pin hole 126 that extends axially and through which the positioning pin 15c is inserted.

[0065] The end of the through hole 15a of the knuckle 15 on the PCB mounting member 120 side in the axial direction is an expanded diameter portion 15d whose radial dimension is enlarged. The positioning pin 15c is inserted into the pin holes 76 and 126, and the extension portion 124 of the PCB mounting member 120 is fitted into the expanded diameter portion 15d. This aligns the centers of the through holes 15a, 72, and 122. The extension portion 124 and the expanded diameter portion 15d can improve the alignment accuracy.

[0066] The board mounting member 120, the first wall portion 73 of the dust cover 70, and the knuckle 15 are formed with cable insertion holes 127, 77, and 15e through which the cable 116 connected to the connector 115 of the sensor board 100 is inserted.

[0067] Next, the manufacturing process of the detection device will be described.

[0068] (A1) The portion of the sensor board 100 on the second plate surface 102b side is attached to the protrusion 130 of the board attachment member 120 with the board attachment bolt 131.

[0069] (B1) By overlapping the board assembly, which is the board mounting member 120 to which the sensor board 100 is attached, and the dust cover 70 with the knuckle 15, the through holes 122, 72, 15a of the board mounting member 120, the dust cover 70, and the knuckle 15 are aligned.

[0070] Specifically, the positioning pin 15c is inserted into the pin holes 76 and 126, and the extension portion 124 of the board mounting member 120 is fitted into the expanded diameter portion 15d. As a result, the bolt insertion hole 15b of the knuckle 15, the bolt insertion hole 71 of the dust cover 70, and the bolt insertion hole 123 of the board mounting member 120 are aligned, and the dust cover 70 and the board mounting member 120 are placed on the knuckle 15.

[0071] (C1) The positioning protrusion 125 of the board mounting member 120 is fitted into the groove 53 of the hub bearing 40, and the portion of the outer cylindrical portion 51 on the side opposite the flange portion 62 from the hub mounting portion 52 is fitted into each of the through holes 122, 72, 15a.

[0072] (D1) With the outer cylindrical portion 51 fitted into each of the through holes 122, 72, 15a, the bolt 16 is inserted into each of the bolt insertion holes 15b, 71, 123 and the female threaded hole 52a, and the male thread of the bolt 16 is screwed into the female threaded hole 52a. As a result, the hub bearing 40 is fixed to the knuckle 15, as shown in Figure 11. For convenience, the target member 80 is not shown in Figure 11.

[0073] To improve the detection accuracy of the displacements ΔZ and ΔY, the relative position of the sensor substrate 100 with respect to the central axis of rotation of the hub bearing 40 is important. In the wheel unit 10, the outer ring member 50 of the hub bearing 40 is designed to fit into the through hole 15a of the knuckle 15. This design reduces the misalignment between the center of the through hole 15a and the central axis of rotation of the hub bearing 40.

[0074] In this embodiment, the above structure is used to improve the detection accuracy of the displacements ΔZ and ΔY. More specifically, the outer cylindrical portion 51 of the outer ring member 50 is fitted into the through hole 15a of the knuckle 15. The board mounting member 120 is fixed to the knuckle 15 with the through hole 122 of the board mounting member 120 fitted into the outer cylindrical portion 51. This reduces the deviation between the through hole 122 of the board mounting member 120, to which the sensor board 100 is fixed, and the central axis of rotation of the hub bearing 40, with the knuckle 15 as the reference. As a result, the relative position of the sensor board 100 and the target member 80 provided on the flange portion 62 of the hub bearing 40 can be set to an appropriate position for improving the detection accuracy of the displacements ΔZ and ΔY.

[0075] The configuration in which the above-described board mounting member 120 is used can reduce the effect of a change in the shape of the hub bearing 40 on the mounting mode of the sensor board 100 for aligning the first plate surface 102a of the sensor board 100 facing the target member 80. As a result, even if the shape of the hub bearing 40 changes depending on the vehicle model, for example, changes in the shape of the sensor board 100 can be minimized.

[0076] In order to improve the detection accuracy of each vertical displacement ΔZ and vertical load Fz, it is desirable to arrange the circumferential center positions of each of the coils 110 to 112 of the sensor substrate 100 at the position of the upper end of the target member 80 (hereinafter referred to as ideal arrangement), as shown in Fig. 12(a). Fig. 12(a) shows the case where the caster angle of the vehicle is 0.

[0077] When the vehicle model changes, the caster angle may change. In this case, even if the board mounting member 120 allows for ideal placement in the case of Fig. 12(a), if the vehicle has a caster angle that deviates from 0, the ideal placement of the coils 110 to 112 cannot be achieved, as shown in Fig. 12(b).

[0078] Therefore, the shape of the board mounting member 120 is changed according to the caster angle. Specifically, for example, the positions of the protrusions 130, the bolt insertion holes 123, the pin holes 126, etc. are changed. This allows the circumferential positions of the coils 110-112 to be changed without changing the shape of the sensor board 100. As a result, the coils 110-112 can be ideally arranged.

[0079] <Modification of the first embodiment> The number of divisions of the target member 80 is not limited to two, and may be, for example, three or four (e.g., equally divided in the circumferential direction). Furthermore, the target member 80 is not limited to being divided, and may be composed of a single member.

[0080] Second Embodiment The second embodiment will be described below with reference to the drawings, focusing on the differences from the first embodiment. In this embodiment, as shown in Figures 13 and 14, the substrate mounting member 220 is composed of multiple divided members. In this embodiment, an example of three divided members is shown. Hereinafter, the three divided members will be referred to as a first divided member 220A, a second divided member 220B, and a third divided member 220C.

[0081] Three female screw holes 101 (corresponding to "fixing portions") are provided in the sensor substrate 100. Hereinafter, the three female screw holes 101 will be referred to as a first female screw hole 101A, a second female screw hole 101B, and a third female screw hole 101C.

[0082] First divided member 220A is a member corresponding to first female screw hole 101A, second divided member 220B is a member corresponding to second female screw hole 101B, and third divided member 220C is a member corresponding to third female screw hole 101C.

[0083] Each of the divided members 220A, 220B, and 220C is provided with a protrusion 230, a bolt insertion hole 232, a pin hole 233, and a pin hole 226 that have the same functions as the protrusion 130, the bolt insertion hole 132, the pin hole 133, and the pin hole 126. A positioning pin 15c corresponding to the pin hole 226 of each of the divided members 220A, 220B, and 220C is provided in the knuckle 15. Furthermore, the dust cover 70 is formed with pin holes 76 (three pin holes 76) that correspond to the pin holes 226 of each of the divided members 220A, 220B, and 220C.

[0084] The radially inner end of each of the divided members 220A, 220B, and 220C is an arc-shaped inner peripheral edge 225. The inner peripheral edge 225 is formed with an extension 224 that extends in a direction perpendicular to the plate surface of each of the divided members 220A, 220B, and 220C and has a function similar to that of the extension 124.

[0085] Next, a manufacturing process for the detection device of this embodiment will be described.

[0086] (A2) By screwing the board mounting bolts 131 into the first, second and third female screw holes 101A, 101B and 101C of the sensor board 100, the sensor board 100 is attached to the protrusions 230 of the first, second and third divided members 220A, 220B and 220C.

[0087] (B2) By overlapping each of the divided members 220A, 220B, 220C and the dust cover 70 to which the sensor board 100 is attached with the knuckle 15, the inner peripheral portion 225 of each of the divided members 220A, 220B, 220C is aligned with the through holes 122, 72, 15a of the dust cover 70 and the knuckle 15, respectively.

[0088] Specifically, each positioning pin 15c is inserted through pin hole 76 of dust cover 70 and pin hole 226 of each divided member 220A, 220B, 220C, and the extension portion 224 of each divided member 220A, 220B, 220C is fitted into enlarged diameter portion 15d. This aligns bolt insertion hole 15b of knuckle 15, bolt insertion hole 71 of dust cover 70, and bolt insertion hole 223 of each divided member 220A, 220B, 220C, and places the dust cover 70 and board mounting member 120 on top of the knuckle 15.

[0089] (C2) The portion of the outer cylindrical portion 51 that is closer to the flange portion 62 than the hub mounting portion 52 is fitted into each of the through holes 72 and 15a.

[0090] (D2) With the outer cylindrical portion 51 fitted into each of the through holes 72 and 15a, the bolt 16 is inserted through each of the bolt insertion holes 15b, 71, and 223 and the female threaded hole 52a, and the male thread of the bolt 16 is screwed into the female threaded hole 52a. This fixes the hub bearing 40 to the knuckle 15.

[0091] According to the present embodiment described above, for example, the weight of the board mounting member can be reduced.

[0092] Third Embodiment The third embodiment will be described below with reference to the drawings, focusing on differences from the first embodiment. In this embodiment, as shown in FIGS. 15 and 16 , a dust cover 170 serves as the board mounting member 120. The dust cover 170 is provided with a positioning protrusion 325, a protrusion 330, a bolt insertion hole 332, and a pin hole 333, which have functions similar to those of the positioning protrusion 125, the protrusion 130, the bolt insertion hole 132, and the pin hole 133. Furthermore, an extension 180, which has a function similar to that of the extension 124, is formed on the periphery of the through hole 72 of the first wall portion 73 of the dust cover 170. Furthermore, a pin hole 181, which has a function similar to that of the pin hole 76, is formed in the first wall portion 73.

[0093] Next, the manufacturing process of the detection device will be described.

[0094] (A3) The portion of the sensor board 100 on the second plate surface 102b side is attached to the protrusion 330 of the dust cover 170 with the board attachment bolt 131.

[0095] (B3) By overlapping the dust cover 170 to which the sensor board 100 is attached and the knuckle 15, the through holes 72, 15a of the dust cover 170 and the knuckle 15 are aligned.

[0096] Specifically, the positioning pin 15c is inserted into the pin hole 181, and the extension portion 180 is fitted into the expanded diameter portion 15d. As a result, the bolt insertion hole 15b of the knuckle 15 and the bolt insertion hole 71 of the dust cover 70 are aligned, and the dust cover 70 is placed on top of the knuckle 15.

[0097] (C3) The positioning protrusion 325 is fitted into the groove 53 of the hub bearing 40, and the portion of the outer cylindrical portion 51 on the side opposite to the flange portion 62 from the hub mounting portion 52 is fitted into each of the through holes 72, 15a.

[0098] (D3) With the outer cylindrical portion 51 fitted into each of the through holes 72, 15a, the bolt 16 is inserted into each of the bolt insertion holes 15b, 71 and the female threaded hole 52a, and the male thread of the bolt 16 is screwed into the female threaded hole 52a. This fixes the hub bearing 40 to the knuckle 15.

[0099] The area of ​​the first wall portion 73 of the dust cover 170 is larger than the area of ​​the sensor substrate 100. Therefore, heat generated in the sensor substrate 100 can be released toward the dust cover 170. The dust cover 170 also includes a connecting portion 74 and a second wall portion 75. This increases the effectiveness of releasing heat generated in the sensor substrate 100, and prevents the temperature of the sensor substrate 100 from rising.

[0100] Furthermore, according to this embodiment, since the board mounting member 120 is not provided, the vehicle width direction dimension of the detection device can be reduced.

[0101] <Fourth embodiment> The fourth embodiment will be described below with reference to the drawings, focusing on the differences from the first embodiment. This embodiment employs a configuration that can suppress temperature increases in the board mounting member and the sensor board. This configuration will be described below with reference to Figures 17 to 19.

[0102] The board mounting member 320 includes a plate-shaped annular plate portion 340 and a protrusion portion 330 (corresponding to the "mounting portion"). The annular plate portion 340 includes a first plate surface 321a and a second plate surface 321b, similar to the first embodiment.

[0103] As in the first embodiment, the protrusion 330 extends from the first plate surface 321a of the annular plate portion 340 toward the flange portion 62 in the axial direction. A plurality of protrusions 330 (three are illustrated in the figure) are formed spaced apart in the circumferential direction. Of the plurality of protrusions 330, the protrusions 330 at both ends in the circumferential direction are protrusions for attaching both ends of the sensor board 100 in the circumferential direction. Of the plurality of protrusions 330, the protrusion 330 sandwiched between the protrusions 330 at both ends in the circumferential direction is a protrusion for attaching an intermediate portion of the sensor board 100 in the circumferential direction. In this embodiment, the installation position of the connector on the sensor board 100 and the shape of the sensor board 100 are changed from those in the first embodiment. Therefore, the installation positions of the cable insertion hole 327 and the like of the board mounting member 320 are also changed. For convenience, the illustration of the extensions is omitted in FIG. 17 and other figures.

[0104] The annular plate portion 340 is formed with a bolt insertion hole 323 through which the bolt 16 is inserted. Each protrusion portion 330 is formed with a bolt insertion hole 332 that penetrates in the axial direction and through which the board mounting bolt 131 is inserted. Of the multiple protrusions 330, those at both circumferential ends are formed with pin holes 333 that extend in the axial direction and through which the positioning pin 103 is inserted. A circular through hole 322 into which the outer cylindrical portion 51 is fitted is formed in the center of the annular plate portion 340.

[0105] Fig. 19 is a view of the annular plate portion 340 as viewed from the first plate surface 321a side. In Fig. 19, the sensor substrate 100 is indicated by a dashed line. The sensor substrate 100 has an arc shape that follows the annular plate portion 340, and is attached to the protrusion portion 330 so as to be spaced apart from the annular plate portion 340.

[0106] When the sensor substrate 100 is viewed from the axial direction, a predetermined region of the sensor substrate 100 is defined as a coil installation region 118, in which the excitation coil 110 and the receiving coils 111, 112 are provided, as indicated by the dashed-dotted line. The coil installation region 118 is provided in the sensor substrate 100 so as to avoid the bolt insertion holes 323. A portion of the sensor substrate 100 other than the coil installation region 118 is defined as a non-coil installation region 119, as indicated by the dashed-two-dot line. The non-coil installation region 119 is provided so as to avoid the bolt insertion holes 323.

[0107] The board mounting member 320 includes a thick portion 350. The thick portion 350 extends in the axial direction from a portion of the first plate surface 321a of the annular plate portion 340 that faces the coil non-installation area 119 in the axial direction toward the sensor board 100. The thick portion 350 is spaced apart from the sensor board 100.

[0108] Frictional heat is generated when the disc pad is pressed against the sliding portion 23 of the disc rotor 21. This causes the temperature to rise near the disc rotor 21. Here, by providing the thick portion 350 in the annular plate portion 340, the heat capacity of the board mounting member 320 can be increased. As a result, the temperature rise of the board mounting member 320 can be suppressed. This suppresses the temperature rise in the space radially inside the disc rotor 21, and also the temperature rise of the sensor substrate 100. As a result, the occurrence of overheating abnormalities in the sensor substrate 100 can be suppressed, and a decrease in the load calculation accuracy can be suppressed.

[0109] In this embodiment, the board mounting member 320 is made of a conductive material, specifically aluminum, which is a metal material. If the board mounting member 320 is close to each of the coils 110-112, magnetic flux generated when current is passed through each of the coils 110-112 generates eddy currents in the board mounting member 320. In this case, there is a concern that the temperature of the board mounting member 320 may rise.

[0110] Therefore, the thick portion 350 is provided in the portion of the annular plate portion 340 that faces the coil non-installation area 119, rather than in the portion that faces the coil installation area 118. This makes it possible to suppress the generation of eddy currents and to suppress a temperature rise in the board mounting member 320 that is caused by eddy currents. As a result, a temperature rise in the sensor board 100 can also be suppressed.

[0111] According to the present embodiment described above, the sensor substrate 100 can be protected from overheating.

[0112] <Modification of the Fourth Embodiment> The configuration of the thick portion 350 of the fourth embodiment may be applied to the dust cover 170 of the third embodiment.

[0113] Fifth Embodiment The fifth embodiment will be described below with reference to the drawings, focusing on the differences from the fourth embodiment. In this embodiment, as shown in Fig. 20, heat dissipation fins 360 are provided on the second plate surface 321b of the annular plate portion 340. Note that heat dissipation fins may be provided on the first plate surface 321a in addition to or instead of the second plate surface 321b.

[0114] According to the present embodiment described above, the heat dissipation properties of the board mounting member 320 can be improved, and the temperature rise of the board mounting member 320 can be suppressed.

[0115] <Modification of the Fifth Embodiment> When the configuration of the thick portion 350 of the fourth embodiment is applied to the dust cover 170 of the third embodiment, the dust cover 170 may be provided with heat dissipation fins.

[0116] Sixth Embodiment The sixth embodiment will be described below with reference to the drawings, focusing on differences from the fourth embodiment. In this embodiment, as shown in Figures 21 and 22, the substrate mounting member 320 includes a side wall 360. The side wall 360 extends from the outer peripheral edge of the annular plate 340 toward the sensor substrate 100 in the axial direction. In this embodiment, the side wall 360 is provided over the entire outer peripheral edge of the annular plate 340. The side wall 360 extends from the outer peripheral edge of the annular plate 340 in the axial direction, beyond the thick-walled portion 350, to a position closer to the flange 62 than the sensor substrate 100.

[0117] The side wall portion 360 includes a first wall portion 361 provided on a first peripheral portion of the outer peripheral edge portion of the annular plate portion 340 that faces the brake caliper 33, and a second wall portion 362 provided on a second peripheral portion of the outer peripheral edge portion other than the first peripheral portion.

[0118] According to the present embodiment described above, frictional heat generated by the disc rotor 21 is less likely to be transmitted to the sensor substrate 100. This makes it possible to suppress a temperature rise in the sensor substrate 100. In particular, in this embodiment, the first wall portion 361 provided on the first peripheral edge portion facing the brake caliper 33 can enhance the effect of suppressing a temperature rise in the sensor substrate 100.

[0119] <Other embodiments> The above-described embodiments may be modified as follows.

[0120] In the sixth embodiment, the side wall portion may be provided only on a part of the outer circumferential edge portion of the annular plate portion 340 (for example, the first circumferential edge portion).

[0121] 23, the board mounting member 420 may have an elongated hole formed therein as the bolt insertion hole 423, the elongated hole extending in the circumferential direction around the central axis of the through hole 122. In this case, by changing the position of the positioning pin 15c provided on the knuckle 15, the mounting position of the sensor board 100 can be set according to the caster angle (see FIG. 12).

[0122] The hub bearing is not limited to an inner ring rotation type, and may be an outer ring rotation type. Specifically, the inner ring axial member (corresponding to the "first bearing member") constituting the outer ring rotation type hub bearing has an inner cylindrical portion (corresponding to the "first cylindrical portion") extending axially and is fixed to the knuckle 15. The outer ring axial member (corresponding to the "second bearing member") constituting the hub bearing has an outer cylindrical portion (corresponding to the "second cylindrical portion") provided radially outside the inner cylindrical portion, and a flange portion extending radially from the outer cylindrical portion and to which the wheel is fixed.

[0123] The circumferential center positions of the first and second receiving coils 111, 112 may be located at a position axially facing the right or left end of the target member 80, rather than at a position axially facing the upper end of the target member 80. In this case, the sensor board 100 can calculate the force acting between the ground contact surface GL and the wheel in the vehicle length direction (hereinafter referred to as the longitudinal load Fx) instead of the vertical load Fz. The direction in which the lateral force Fy acts is perpendicular to the direction in which the longitudinal load Fx acts. The longitudinal load Fx is used by the control device to control the running of the vehicle.

[0124] The sensor board and the board mounting member are not limited to being fixed to the board mounting member at three points, but may be fixed at one point, two points, or four or more points.

[0125] The disc rotor is not limited to a ventilated disc, but may be, for example, a solid disc made of a single circular plate.

[0126] The mechanical device to which the detection device can be applied is not limited to a wheel unit, but may also be, for example, an aircraft equipped with a propeller as a rotating body, a ship equipped with a screw as a rotating body, an internal combustion engine equipped with a crankshaft as a rotating body, or a generator equipped with a turbine as a rotating body.

[0127] Furthermore, the rotating body is not limited to being used with the axial direction of the rotating body being horizontal, but may also be used with the axial direction being in a direction other than horizontal (for example, up and down).

[0128] The following describes characteristic configurations extracted from the above-described embodiments. [Configuration 1] A detection device applied to a mechanical device (10), The mechanical device is A rotating body (11, 14), a hub bearing (40) that supports the rotor rotatably relative to a base portion (15); Equipped with The hub bearing is a first bearing member (50) having a first cylindrical portion (51) extending in the axial direction of the rotational center axis of the hub bearing and fixed to the base portion; a second bearing member (60) including a second cylindrical portion (61) provided at a position facing the first cylindrical portion in a radial direction perpendicular to the axial direction, and a flange portion (62) extending from the second cylindrical portion in the radial direction and to which the wheel is fixed; a rolling element (41) provided between the first cylindrical portion and the second cylindrical portion; the second bearing member is rotatably supported relative to the base portion, a detection target portion (80) provided on the flange portion on the base portion side in the axial direction; a sensor substrate (100) having a first plate surface (102a) facing the detection target in the axial direction and a second plate surface (102b) that is the reverse side of the first plate surface; a substrate mounting member (120, 170, 220, 320, 420) to which the sensor substrate is attached and which is fixed to the first bearing member; Equipped with the detection target portion has an annular shape extending in a circumferential direction of the second cylindrical portion, the annular shape being centered on the central axis of rotation, the sensor substrate outputs a voltage signal corresponding to a relative displacement of the detection target portion with respect to the sensor substrate; the substrate mounting member is disposed between the base portion and the detection target portion in the axial direction with the first cylindrical portion fixed to the base portion, A detection device in which a portion of the sensor board on the second plate surface side is attached to a portion of the board attachment member that faces the detection target in the axial direction. [Configuration 2] the substrate mounting member has an annular shape extending in the circumferential direction, 2. The detection device according to claim 1, wherein the substrate mounting member has a through-hole (122, 72, 322) into which the first cylindrical portion is fitted. [Configuration 3] the wheel unit includes a heat shield plate (70) having a wall portion (73) facing the second plate surface of the board mounting member, A through hole (72) into which the first cylindrical portion is fitted is formed in the center of the wall portion, The base portion has a through hole (15a) formed therein into which the first cylindrical portion is fitted, The detection device described in configuration 2, wherein the first cylindrical portion is fitted into the through holes of the base portion, the heat shield plate, and the substrate mounting member, and the first cylindrical portion is fixed to the base portion with the wall portion sandwiched between the base portion and the substrate mounting member. [Configuration 4] 3. The detection device according to claim 2, wherein the substrate mounting member is a heat shield plate (170) having a wall portion (73) whose area is larger than that of the sensor substrate. [Configuration 5] The through hole of the base portion is formed as an expanded diameter portion (15d) on the hub bearing side, the inner diameter of which is larger than the inner diameter of the through hole, an extension (124, 180) extending toward the base portion in the axial direction is formed on the periphery of the through hole of the board mounting member, A detection device described in any one of configurations 1 to 4, wherein the first cylindrical portion is fitted into the through holes of the base portion and the substrate mounting member, and the extension portion is fitted into the expanded diameter portion. [Configuration 6] the first bearing member is an outer ring member having, as the first cylindrical portion, an outer cylindrical portion that is disposed closer to the base portion than the flange portion in the axial direction, the second bearing member is an inner ring member having, as the second cylindrical portion, an inner cylindrical portion provided at a position facing the outer cylindrical portion and more inward in the radial direction, a hub mounting portion (52) extending radially outward is provided at an intermediate portion of the outer cylindrical portion in the axial direction, a flat surface (52b) extending in a direction perpendicular to the axial direction is formed on a portion of the hub attachment portion on the base portion side in the axial direction, 6. The detection device according to any one of configurations 1 to 5, wherein the substrate mounting member abuts against the flat surface. [Explanation of symbols]

[0129] 10...wheel unit, 15...knuckle, 40...hub bearing, 80...target member, 100...sensor board, 120...board mounting member

Claims

1. A detection device applied to a mechanical device (10), The mechanical device is A rotating body (11, 14), a hub bearing (40) that rotatably supports the rotating body relative to a base portion (15); Equipped with The hub bearing is a first bearing member (50) having a first cylindrical portion (51) extending in an axial direction, which is the direction in which the rotational center axis of the hub bearing extends, and fixed to the base portion; a second bearing member (60) having a second cylindrical portion (61) provided at a position facing the first cylindrical portion in a radial direction perpendicular to the axial direction, and a flange portion (62) extending from the second cylindrical portion in the radial direction and to which the rotating body is fixed; a rolling element (41) provided between the first cylindrical portion and the second cylindrical portion; the second bearing member is rotatably supported relative to the base portion, a detection target portion (80) provided on the flange portion on the base portion side in the axial direction; a sensor substrate (100) having a first plate surface (102a) facing the detection target in the axial direction and a second plate surface (102b) that is a rear surface of the first plate surface; a substrate mounting member (120, 170, 220, 320, 420) to which the sensor substrate is attached and which is fixed to the first bearing member; Equipped with the detection target portion has an annular shape extending in a circumferential direction of the second cylindrical portion, the annular shape being centered on the central axis of rotation, the sensor substrate outputs a voltage signal corresponding to a relative displacement of the detection target portion with respect to the sensor substrate; the substrate mounting member is disposed between the base portion and the detection target portion in the axial direction with the first cylindrical portion fixed to the base portion, A detection device, wherein a portion of the sensor board on the second plate surface side is attached to a portion of the board mounting member that faces the detection target in the axial direction.

2. the substrate mounting member has an annular shape extending in the circumferential direction, The detection device according to claim 1 , wherein the substrate mounting member has a through-hole (122, 72, 322) into which the first cylindrical portion is fitted.

3. The machine device includes a heat shield plate (70) having a wall portion (73) facing the second plate surface of the substrate mounting member, A through hole (72) into which the first cylindrical portion is fitted is formed in the center of the wall portion, The base portion has a through hole (15a) formed therein into which the first cylindrical portion is fitted, 3. The detection device of claim 2, wherein the first cylindrical portion is fitted into the through holes of the base portion, the heat shield plate, and the substrate mounting member, and the first cylindrical portion is fixed to the base portion with the wall portion sandwiched between the base portion and the substrate mounting member.

4. 3. The detection device according to claim 2, wherein the substrate mounting member is a heat shield plate (170) having a wall portion (73) whose area is larger than that of the sensor substrate.

5. The through hole of the base portion is formed as an expanded diameter portion (15d) on the hub bearing side, the expanded diameter portion having an inner diameter dimension larger than the inner diameter dimension of the through hole, an extension (124, 180) extending toward the base portion in the axial direction is formed on a peripheral edge of the through hole of the board mounting member, A detection device as described in any one of claims 1 to 4, wherein the first cylindrical portion is fitted into the through holes of the base portion and the substrate mounting member, and the extension portion is fitted into the expanded diameter portion.

6. the first bearing member is an outer ring member having, as the first cylindrical portion, an outer cylindrical portion that is disposed closer to the base portion than the flange portion in the axial direction, the second bearing member is an inner ring member having, as the second cylindrical portion, an inner cylindrical portion provided at a position facing the outer cylindrical portion and more inward in the radial direction, a hub mounting portion (52) extending radially outward is provided at an intermediate portion of the outer cylindrical portion in the axial direction, a flat surface (52b) extending in a direction perpendicular to the axial direction is formed on a portion of the hub attachment portion on the base portion side in the axial direction, 5. The detection device according to claim 1, wherein the substrate mounting member abuts against the flat surface.

7. The sensor substrate has an arc shape extending in the circumferential direction, The sensor substrate is provided with a plurality of fixing portions (101) spaced apart in the circumferential direction for fixing to the substrate mounting member (220), 2. The detection device according to claim 1, wherein the substrate mounting member is a plurality of divided members (220A, 220B, 220C) that correspond to the respective fixing portions and are arranged spaced apart from each other.

8. The sensor substrate includes: an excitation coil (110) to which an excitation voltage is supplied; receiving coils (111, 112) in which a voltage is induced when an excitation voltage is supplied to the excitation coil; and the receiving coil outputs a voltage signal corresponding to a relative displacement of the detection target portion with respect to the sensor substrate; The substrate mounting member (320) An annular plate portion (340) having a plate shape; an attachment portion (330) provided on a portion of the annular plate portion on the second plate surface side of the sensor board in the axial direction, to which the portion of the sensor board on the second plate surface side is attached; and The through hole (322) into which the first cylindrical portion is fitted is formed in the center of the annular plate portion, the sensor board has an arc shape that follows the annular plate portion and is attached to the attachment portion so as to be spaced apart from the annular plate portion; the board mounting member is made of a conductive material, When the sensor substrate is viewed from the axial direction, a predetermined region of the sensor substrate is defined as a coil installation region (118) in which the excitation coil and the receiving coil are provided, and at least a part of the region of the sensor substrate other than the coil installation region is defined as a coil non-installation region (119), A detection device as described in any one of claims 2 to 4, wherein the substrate mounting member has a thick portion (350) extending from a portion of the annular plate portion facing the non-coil installation area in the axial direction toward the sensor substrate side in the axial direction.

9. The mechanical device is a wheel unit (10) having vehicle wheels (11, 14) as the rotating bodies, The base portion is a knuckle (15) of the vehicle, The wheel unit includes a disk rotor (21) extending in the circumferential direction around the central axis of rotation, The disk rotor is a cylindrical disk peripheral wall portion (25) extending in the axial direction on the radially outer side of the flange portion and the sensor substrate; an annular sliding portion (23) extending radially outward from an end portion of the disk peripheral wall portion in the axial direction; and the substrate mounting member is provided on the inner side of the disk rotor in the radial direction, the substrate mounting member has a side wall portion (360-362) extending from an outer peripheral edge portion of the annular plate portion toward the sensor substrate in the axial direction, The detection device according to claim 8 , wherein the side wall portion extends from an outer peripheral edge of the annular plate portion at least to a position facing the sensor board in the radial direction.

10. The detection device according to claim 8 , wherein the substrate mounting member has heat dissipation fins provided on a plate surface of the annular plate portion.

11. A method for manufacturing a detection device applied to a mechanical device (10), comprising: The mechanical device is A rotating body (11, 14), a hub bearing (40) that rotatably supports the rotating body relative to a base portion (15); Equipped with The hub bearing is a first bearing member (50) having a first cylindrical portion (51) extending in an axial direction, which is the direction in which the rotational center axis of the hub bearing extends, and fixed to the base portion; a second bearing member (60) having a second cylindrical portion (61) provided at a position facing the first cylindrical portion in a radial direction perpendicular to the axial direction, and a flange portion (62) extending from the second cylindrical portion in the radial direction and to which the rotating body is fixed; a rolling element (41) provided between the first cylindrical portion and the second cylindrical portion; the second bearing member is rotatably supported relative to the base portion, The detection device includes: a detection target portion (80) provided on the flange portion on the base portion side in the axial direction; a sensor substrate (100) having a first plate surface (102a) facing the detection target in the axial direction and a second plate surface (102b) that is a rear surface of the first plate surface; a substrate mounting member (120, 170, 220, 320) to which the sensor substrate is attached and which is fixed to the first bearing member; Equipped with the detection target portion has an annular shape extending in a circumferential direction of the second cylindrical portion, the annular shape being centered on the central axis of rotation, the sensor substrate outputs a voltage signal corresponding to a relative displacement of the detection target portion with respect to the sensor substrate; The base portion has a through hole (15a) formed therein into which the first cylindrical portion is fitted, a step of attaching a portion of the sensor board on the second plate surface side to a portion of the board attachment member that faces the detection target in the axial direction; a step of overlapping the base portion with the substrate mounting member to which the sensor substrate is attached and aligning the through holes of the substrate mounting member and the base portion, and fitting the first cylindrical portion of the hub bearing into the through holes of the substrate mounting member and the base portion; a step of fixing the first cylindrical portion to the base portion in a state in which the first cylindrical portion is fitted into the through hole; A method for manufacturing a detection device, comprising:

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