Detection device and method for manufacturing detection device

Abstract

To provide a detection device capable of suppressing the occurrence of a situation where a relationship between a relative displacement of a detection target portion with respect to a sensor substrate and an output signal of a receiving coil deviates from a reference relationship, and a method for manufacturing the detection device.SOLUTION: A sensor substrate of a detection device includes an excitation coil and a receiving coil. The receiving coil outputs a voltage signal corresponding to a relative displacement of a detection target portion 81 of a target member 80 with respect to the sensor substrate. A bolt insertion hole 64, through which a hub bolt 17 is inserted, is formed in a flange portion 62 of a hub bearing 40. A head portion 17a of the hub bolt 17 is positioned, in an axial direction, closer to the flange portion 62 than a flat surface 85a of a recess 85 of the detection target portion 81.SELECTED DRAWING: Figure 5

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), rolling elements, and a hub bolt. The first bearing member has a first cylindrical portion extending in the axial direction, which is the direction of the rotational center axis of the hub bearing, and is fixed to a base portion. 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 outward from the second cylindrical portion. Rolling elements are provided between the first and second cylindrical portions. The hub bolt is made of a magnetic material and is a bolt for fixing the rotating body to the flange 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 and a sensor substrate as components for detecting displacement or force. The sensor substrate is provided at a position offset from the flange in the axial direction. The detection target is provided at a portion of the flange that faces the sensor substrate in the axial direction, and has an annular shape that extends circumferentially around the rotational center axis of the second cylindrical portion.

[0006] The detection target portion has a configuration in which a plurality of protrusions projecting in the axial direction from the flange portion are provided at predetermined intervals in the circumferential direction.

[0007] The sensor substrate has an excitation coil to which an excitation voltage is supplied, and a receiving coil. When an excitation voltage is supplied to the excitation coil, a magnetic flux is generated in the excitation coil. At least a portion of the generated magnetic flux interlinks with the receiving coil, thereby inducing a voltage in the receiving coil. The receiving coil outputs a voltage signal corresponding to the relative displacement of the detection target with respect to the sensor substrate. Displacement or force is detected based on the output voltage signal.

[0008] Here, the relationship between the relative displacement and the output signal of the receiving coil (for example, the amplitude of the output signal) may deviate from a reference relationship (for example, a relationship assumed at the time of design), which may result in a decrease in the accuracy of detecting the displacement or force based on the output signal of the receiving coil.

[0009] The main purpose of the present disclosure is to provide a detection device and a manufacturing method for a detection device that can prevent the relationship between the relative displacement of the detection target with respect to the sensor substrate and the output signal of the receiving coil from deviating from a standard relationship. [Means for solving the problem]

[0010] 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 that is the direction of 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 radially outward from the second cylindrical portion; a rolling element provided between the first cylindrical portion and the second cylindrical portion; a hub bolt made of a magnetic material for fixing the rotating body to the flange portion; the second bearing member is rotatably supported relative to the base portion, a sensor substrate provided at a position shifted from the flange portion in the axial direction; a detection target portion that is provided in a portion of the flange portion that faces the sensor board in the axial direction and has an annular shape that extends in a circumferential direction of the second cylindrical portion around the rotation central axis; Equipped with The detection target portion is configured such that a plurality of convex portions projecting in the axial direction from the flange portion are provided at predetermined intervals in the circumferential direction, The sensor substrate includes: an excitation coil to which an excitation voltage is supplied; a receiving coil in which a voltage is induced when an excitation voltage is supplied to the exciting 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 flange portion is formed with a through hole extending in the axial direction, the bolt insertion hole through which the hub bolt is inserted, Of both end portions of the hub bolt, the end portion on the sensor board side with respect to the flange portion in the axial direction is located closer to the flange portion than the convex portion in the axial direction.

[0011] The hub bolt is inserted through a bolt insertion hole formed in the flange. If the hub bolt is close to the detection target provided on the flange in the axial direction, there is a concern that some of the magnetic flux generated by the excitation coil will flow to the hub bolt. In this case, the relationship between the relative displacement and the output signal of the receiving coil will deviate from the reference relationship (e.g., the relationship assumed at the time of design). As a result, there is a concern that the accuracy of detecting displacement or force based on the output signal of the receiving coil will decrease.

[0012] Therefore, in this disclosure, of the two ends of the hub bolt, the end closest to the sensor board relative to the flange portion in the axial direction is positioned closer to the flange portion than the protrusion in the axial direction. This allows for a longer axial distance between the sensor board portion of the detection target and the hub bolt. This makes it more difficult for some of the magnetic flux generated by the excitation coil to flow to the hub bolt. As a result, it is possible to prevent the relationship between the relative displacement of the detection target with respect to the sensor board and the output signal of the receiving coil from deviating from the reference relationship. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 2 is a perspective view of a wheel unit according to the first embodiment. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 1 is a longitudinal cross-sectional view of a bearing assembly. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. 2 is a diagram showing the electrical configuration of a sensor substrate and a processing unit. [Figure 11] FIG. [Figure 12] FIG. 10 is a perspective view showing a manner in which a disk member is attached to a target member. [Figure 13] FIG. 10 is a perspective view of a bearing assembly according to a second embodiment. [Figure 14] FIG. [Figure 15] FIG. 1 is a longitudinal cross-sectional view of a bearing assembly. [Figure 16] FIG. [Figure 17] FIG. [Figure 18] FIG. 10 is a perspective view of a bearing assembly according to a third embodiment. [Figure 19] FIG. 1 is a longitudinal cross-sectional view of a bearing assembly. [Figure 20] FIG. [Figure 21] FIG. [Figure 22] FIG. 10 is a perspective view of a bearing assembly according to a fourth embodiment. [Figure 23] FIG. 1 is a longitudinal cross-sectional view of a bearing assembly. [Figure 24] FIG. [Figure 25] FIG. [Figure 26] FIG. 11 is a perspective view showing a manner in which a target member is attached to a hub bearing according to a fifth embodiment. [Figure 27] FIG. [Figure 28] FIG. [Figure 29] FIG. 13 is a view showing a manner in which a target member is attached to an inner ring member according to a sixth embodiment. [Figure 30] FIG. [Figure 31] FIG. 10 is a diagram showing a state in which the target member is press-fitted and fixed into the inner ring member. [Figure 32] FIG. 4 is a diagram showing a manner in which an outer ring member is attached to an inner ring member. [Figure 33] Side view of the bearing assembly. [Figure 34]FIG. 10 is a plan view of a target member according to another embodiment. [Figure 35] FIG. 10 is a plan view of a target member according to another embodiment. [Figure 36] FIG. 10 is a longitudinal sectional view of a wheel unit according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] 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.

[0015] 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.

[0016] A wheel unit 10 as a mechanical device will be described using Figures 1 to 9. Figure 1 is a perspective cross-sectional view of the wheel unit 10 cut along a plane that passes through the center of rotation of the wheel unit 10 and extends vertically, and Figure 2 is a longitudinal cross-sectional view of the wheel unit 10. Figures 3 and 4 are perspective views of a bearing assembly including a hub bearing 40 and a target member 80. Figure 5 is a longitudinal cross-sectional view of the bearing assembly. Figures 6 and 7 are perspective views of the target member, and Figures 8 and 9 are exploded perspective views of the wheel unit 10.

[0017] 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.

[0018] 1, 2, and 8, 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 circular as a whole and a brake caliper 33. The brake caliper 33 is actuated by hydraulic pressure, an electric signal, or the like, and includes a pair of disc pads that contact 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 FIG. 8, the brake caliper 33 is fixed to the knuckle 15, which serves as a base, with a bolt 34.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] The inner ring member 60 includes an inner cylindrical portion 61 (corresponding to the "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. The outer ring member 50 includes an outer cylindrical portion 51 (corresponding to the "first cylindrical portion") provided at a position facing radially outward from the inner cylindrical portion 61. The rolling elements 41 are provided between the outer cylindrical portion 51 and the inner cylindrical portion 61.

[0025] The inner cylindrical portion 61 is composed of a cylindrical first portion 61a that contacts the rolling elements 41 and a cylindrical second portion 61b that is located radially inward of the first portion 61a. The second portion 61b is press-fitted and fixed into a through-hole in the first portion 61a. A shaft insertion hole 63 that penetrates the second portion 61b in the axial direction is formed. A spline is formed on the inner peripheral surface of the shaft insertion hole 63. A shaft (not shown) that transmits rotational power from a driving power source such as a motor is fitted into the shaft insertion hole 63.

[0026] The flange portion 62 is disk-shaped and extends radially outward beyond the outer cylindrical portion 51. A plurality of bolt insertion holes 64, through which hub bolts 17 for fixing the wheel 11 are inserted, are formed in the flange portion 62 and arranged in the circumferential direction. In this embodiment, as shown in FIG. 4, for example, five hub bolts 17 are formed in the circumferential direction. Therefore, five bolt insertion holes 64 are also formed. The hub bolts 17 are made of a magnetic material, and more specifically, they are made of iron, a soft magnetic material.

[0027] 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.

[0028] 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.

[0029] The target member 80 is made of a metal material (e.g., aluminum or iron). The target member 80 is a separate member from the hub bearing 40. The target member 80 includes a detection object portion 81 and a peripheral wall portion 82. The detection object portion 81 is provided at a position axially opposite the sensor board 100 without contacting the sensor board 100, and has an annular shape extending circumferentially about the central axis of rotation of the hub bearing 40. The peripheral wall portion 82 extends axially from the outer peripheral edge of the detection object portion 81 toward the flange portion 62. A bearing insertion hole 83 is formed in the center of the detection object portion 81, penetrating in the axial direction. The inner cylindrical portion 61 is inserted into the bearing insertion hole 83.

[0030] 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.

[0031] The detection target portion 81 has protrusions 84 arranged in a circumferential direction, protruding from the flat surface of the detection target portion 81 in the axial direction (inward in the vehicle width direction). Recesses 85 are formed between the protrusions 84 arranged in the circumferential direction. The protrusions 84 and recesses 85 are arranged alternately in the circumferential direction. The surface of the protrusions 84 is a flat surface 84a, and the surface of the recesses 85 is a flat surface 85a. In this embodiment, 12 pairs of protrusions 84 and recesses 85 are provided. The circumferential length of the multiple protrusions 84 is equal to the circumferential length of the multiple recesses 85.

[0032] In this embodiment, the target member 80 is divided into two parts in the circumferential direction, as shown in Figures 6 and 7, 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.

[0033] Next, the sensor substrate 100 will be described.

[0034] The sensor substrate 100 is a so-called eddy current inductive sensor. The sensor substrate 100 is disposed such that the plate surface of the sensor substrate 100 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 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.

[0035] The sensor substrate 100 has an arc shape that follows the target member 80. As shown in FIG. 10 , 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Next, the load calculation process will be described.

[0041] 2, when a lateral force Fy acts on the wheel, the inclination of the central axis of the inner ring member 60 relative to the central axis 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.

[0042] On the other hand, when a vertical load Fz acts on the wheel, the central axis of the inner ring member 60 is displaced in a direction perpendicular to the central axis 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.

[0043] 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.

[0044] The sensor substrate 100 and the load calculation process are described in, for example, Japanese Patent Application Laid-Open No. 2023-130285.

[0045] Next, a configuration for fixing the sensor board 100 to the knuckle 15 will be described with reference to Figures 8 and 9. For convenience, the target member 80 and the like are not shown in Figures 8 and 9.

[0046] The wheel unit 10 includes a board mounting member 120 as a component for fixing the sensor board 100 to the knuckle 15. 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.

[0047] A protrusion 130 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] The first plate surface 121a of the substrate mounting member 120 abuts against the flat surface 52b, and the outer cylindrical portion 51 is fitted into the through-hole 122. As a result, the central axis LCi of the inner ring member 60 and the center of the through-hole 122 are aligned.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 4 to 7, 11 and 12, a description will be given of a configuration for fixing the target member 80 to the flange portion 62. The target member 80 and the hub bearing 40 are integrated together to form the bearing assembly 42.

[0063] A target fixing bolt 213 is screwed into the tip of the peripheral wall portion 82 of the target member 80, and a female screw hole 200 extending in the axial direction is formed therein.

[0064] The bearing assembly 42 includes a disk member 210. A bearing insertion hole 211 into which the inner cylindrical portion 61 is fitted is formed in the center of the disk member 210. The disk member 210 has bolt insertion holes 212, into which the hub bolts 17 are inserted, formed side by side in the circumferential direction.

[0065] A plurality of bolt insertion holes 214 (12 holes are shown in the figure) are formed in the circumferential direction on the outer periphery of the disk member 210, through which target fixing bolts 213 are inserted. The peripheral portion of the disk member 210 around the bolt insertion holes 214 forms a bearing surface 215 for the head 213a of the target fixing bolt 213.

[0066] Next, a method for manufacturing the bearing assembly 42 will be described.

[0067] First, as shown in Figures 5 and 11, the peripheral wall portions 82 of the first and second divided members 80A and 80B are brought into contact with the outer peripheral edge portion of the flange portion 62 from the outside in the radial direction, and the first and second divided members 80A and 80B are joined together to form a circular ring shape.

[0068] 12, the hub bolts 17 are inserted into the bolt insertion holes 212 of the disk member 210, and the plate surface of the disk member 210 is brought into contact with the tip end of the peripheral wall portion 82 and the mounting surface 62b of the flange portion 62 so that the circumferential positions of the female threaded holes 200 of the peripheral wall portion 82 and the bolt insertion holes 214 of the disk member 210 are aligned. In this state, the target fixing bolts 213 are inserted into the bolt insertion holes 214, and are screwed into the female threaded holes 200. As a result, the target member 80 is fixed to the flange portion 62, as shown in FIG. 4. At this time, because the tip end of the peripheral wall portion 82 of the target member 80 is in contact with the outer peripheral edge portion of the flange portion 62, the target member 80 can be stably fixed to the flange portion 62.

[0069] 3, the disc mounting portion 18 has a bolt insertion hole 18a formed therethrough in the axial direction. With the bottom surface 24 of the disc rotor 21 and the disc mounting portion 18 overlapping the plate surface of the circular plate member 210 of the bearing assembly 42, a hub bolt 17 is inserted into the bolt insertion holes 27, 18a. A nut 35 is threaded onto the male thread of the hub bolt 17, thereby fixing the disc mounting portion 18 and the disc rotor 21 to the hub bearing 40. As a result, the target member 80, disc rotor 21, and inner ring member 60 are coaxial, and the target member 80, disc rotor 21, and wheel 11 rotate together.

[0070] In the present embodiment described above, of both longitudinal end portions of the hub bolt 17, the head portion 17a (corresponding to the "first end portion") on the sensor board 100 side in the axial direction is positioned axially outward in the vehicle width direction from the flat surface 85a of the recessed portion 85. The reason for adopting this structure will be explained below.

[0071] The hub bolt 17 is inserted through a bolt insertion hole 64 formed in the flange portion 62. If the axial distance between the target member 80 provided on the flange portion 62 and the hub bolt 17 is short, there is a concern that part of the magnetic flux generated by the excitation coil 110 will flow to the hub bolt 17. In this case, the relationship between the relative displacement of the sensor substrate 100 with respect to the detection object portion 81 of the target member 80 and the output signals of the receiving coils 111 and 112 will deviate from the reference relationship (for example, the relationship assumed at the time of design). As a result, there is a concern that the accuracy of detecting displacement or force based on the output signals of the receiving coils 111 and 112 will decrease.

[0072] Therefore, the above structure is adopted. With this structure, it is possible to increase the axial distance between the flat surface 85a of the recess 85 of the detection object 81 and the head 17a of the hub bolt 17. This makes it difficult for part of the magnetic flux generated by the excitation coil 110 to flow to the hub bolt 17. As a result, it is possible to prevent the relationship between the relative displacement of the detection object 81 with respect to the sensor board 100 and the output signals of the receiving coils 111, 112 from deviating from the reference relationship.

[0073] 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, the structure of the target member 180 is modified as shown in Figures 13 to 17.

[0074] The target member 180 constituting the bearing assembly 142 is made of a metal material (for example, aluminum or iron). The target member 180 includes a detection object portion 181 and a peripheral wall portion 182. The peripheral wall portion 182 abuts against the outer peripheral edge portion of the flange portion 62. A bearing insertion hole 183 penetrating in the axial direction is formed in the center of the detection object portion 181. The inner cylindrical portion 61 is inserted into the bearing insertion hole 183. The detection object portion 181 has convex portions 184 and concave portions 185 alternately provided in the circumferential direction. The surface of the convex portion 184 is a flat surface 184a, and the surface of the concave portion 185 is a flat surface 185a.

[0075] The target member 180 is divided into two parts in the circumferential direction, more specifically, the two parts are divided into two parts with equal circumferential lengths. Hereinafter, one of the divided parts of the target member 180 will be referred to as a first divided part 180A, and the other part will be referred to as a second divided part 180B.

[0076] A countersunk portion 186 that is recessed toward the flange portion 62 in the axial direction relative to a flat surface 185a of the recess 185 is formed on the target member 180 radially inward of the recess 185 and the protrusion 184. The countersunk portion 186 has the shape of an annular plate extending in the circumferential direction.

[0077] An inner insertion hole 187 that penetrates in the axial direction and through which the hub bolt 17 is inserted is formed in the radial center of the counterbore portion 186. The inner insertion holes 187 are arranged in the circumferential direction and the same number as the hub bolts 17. The peripheral edge of the inner insertion hole 187 in the bottom 186a of the counterbore portion 186 forms a bearing surface 187a for the head 17a of the hub bolt 17.

[0078] The head 17a of the hub bolt 17 inserted through the inner insertion hole 187 and the bolt insertion hole 64 of the flange portion 62 abuts against the seat surface 187a, and the target member 180 is sandwiched between the head 17a and the flange portion 62. In this way, the target member 180 is fixed to the flange portion 62.

[0079] The hub bolt 17 is inserted through the bolt insertion holes 27, 18a with the bottom surface 24 of the disc rotor 21 and the disc mounting portion 18 overlapping the mounting surface 62b of the flange portion 62. The disc mounting portion 18 and the disc rotor 21 are fixed to the hub bearing 40 by screwing a nut 35 onto the male thread of the hub bolt 17.

[0080] According to the present embodiment described above, the head 17a of the hub bolt 17 can be positioned closer to the flange portion 62 than the flat surface 185a of the recess 185 that constitutes the target member 80. This makes it difficult for part of the magnetic flux generated by the excitation coil 110 to flow to the hub bolt 17.

[0081] Furthermore, according to this embodiment, the target member 180 can be fixed to the flange portion 62 by using the hub bolt 17. This allows the number of parts in the bearing assembly 142 to be reduced.

[0082] <Third embodiment> The third embodiment will be described below with reference to the drawings, focusing on the differences from the second embodiment. In this embodiment, the structure of the target member 280 is modified as shown in Figures 18 to 21.

[0083] The target member 280 constituting the bearing assembly 242 is made of a metal material (for example, aluminum or iron). The target member 280 includes a detection object portion 281 and a peripheral wall portion 282. The peripheral wall portion 282 abuts against the outer peripheral edge portion of the flange portion 62. A bearing insertion hole 283 penetrating in the axial direction is formed in the center of the detection object portion 281. The inner cylindrical portion 61 is inserted into the bearing insertion hole 283.

[0084] Convex portions 284 and concave portions 285 are provided alternately in the circumferential direction of detection object portion 281. The surface of convex portion 284 is flat surface 284a, and the surface of concave portion 285 is flat surface 285a.

[0085] The target member 280 is divided into two parts, similar to the second embodiment. Hereinafter, one of the divided parts of the target member 280 will be referred to as a first divided part 280A, and the other part will be referred to as a second divided part 280B.

[0086] A countersunk portion 286 that is recessed toward the flange portion 62 in the axial direction relative to the flat surface 285a of the recess 285 is formed in the target member 280 radially inward of the recess 285 and the protrusion 284. The countersunk portion 286 is formed at a position radially inward of the recess 285. The countersunk portion 286 extends radially to the bearing insertion hole 283.

[0087] The countersunk portion 286 is formed with inner insertion holes 287 that pass through in the axial direction and through which the hub bolts 17 are inserted. The inner insertion holes 287 are lined up in the circumferential direction and the same number as the hub bolts 17. The peripheral edge of the inner insertion holes 287 in the bottom 286a of the countersunk portion 286 forms a bearing surface 287a for the head 17a of the hub bolt 17.

[0088] The head 17a of the hub bolt 17 inserted through the inner insertion hole 287 and the bolt insertion hole 64 of the flange portion 62 abuts against the seat surface 287a, and the target member 280 is sandwiched between the head 17a and the flange portion 62. In this way, the target member 280 is fixed to the flange portion 62.

[0089] According to the present embodiment described above, it is possible to achieve the same effects as the second embodiment.

[0090] <Modification of the third embodiment> The countersunk portion 286 may be formed at a radially inner position of the protruding portion 284. Alternatively, the countersunk portion 286 may be formed at a radially inner position of the boundary portion between the protruding portion 284 and the recessed portion 285.

[0091] <Fourth embodiment> The fourth embodiment will be described below with reference to the drawings, focusing on the differences from the second embodiment. In this embodiment, the structure of the target member 380 is modified as shown in Figures 22 to 25.

[0092] The target member 380 constituting the bearing assembly 342 is made of a metal material (for example, aluminum or iron). The target member 380 has a detection object portion 381. A bearing insertion hole 383 penetrating in the axial direction is formed in the center of the detection object portion 381. The inner cylindrical portion 61 is inserted into the bearing insertion hole 383.

[0093] Convex portions 384 and concave portions 385 are provided alternately in the circumferential direction of detection object portion 381. The surface of convex portion 384 is flat surface 384a, and the surface of concave portion 385 is flat surface 385a.

[0094] The target member 380 is divided into two parts, similar to the second embodiment. Hereinafter, one of the divided parts of the target member 380 will be referred to as a first divided part 380A, and the other part will be referred to as a second divided part 380B.

[0095] In the target member 380, between the protrusions 384 adjacent in the circumferential direction (i.e., between the recesses 385), there is formed a countersunk portion 386 that is recessed in the axial direction toward the flange portion 62 with respect to the flat surface 385a of the recess 385. The countersunk portion 386 extends radially to the outer circumferential edge of the target member 380.

[0096] A recessed insertion hole 387 is formed in the center of the counterbore 386, penetrating in the axial direction and into which the hub bolt 17 is inserted. The recessed insertion holes 387 are arranged in the circumferential direction and the same number as the hub bolts 17. The peripheral portion of the recessed insertion hole 387 in the bottom 386a of the counterbore 386 forms a bearing surface 387a for the head 17a of the hub bolt 17.

[0097] The head 17a of the hub bolt 17 inserted through the recess insertion hole 387 and the bolt insertion hole 64 of the flange portion 62 abuts against the seat surface 387a, and the target member 380 is sandwiched between the head 17a and the flange portion 62. In this way, the target member 380 is fixed to the flange portion 62. The head 17a of the hub bolt 17 and the flat surface 385a may be on the same plane.

[0098] According to the present embodiment described above, it is possible to achieve the same effects as in Embodiment 2. Incidentally, the configuration of this embodiment is employed when, for example, the diameter dimension of the target member 380 is reduced.

[0099] Fifth Embodiment The fifth 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 26 to 28, the target member 480 is not divided, but is configured as a single member.

[0100] The target member 480 is made of a metal material (for example, aluminum or iron). As in the first embodiment, the target member 480 includes a detection object portion 481 and a peripheral wall portion 482. The peripheral wall portion 482 abuts against the outer peripheral edge portion of the flange portion 62. A bearing insertion hole 483 that penetrates in the axial direction is formed in the center of the detection object portion 481. The inner cylindrical portion 61 is inserted into the bearing insertion hole 483.

[0101] Convex portions 484 and concave portions 485 are provided alternately in the circumferential direction in the detection target portion 481. A portion of the target member 480 that is radially inward of the detection target portion 481 faces the hub attachment portion 52 in the axial direction. In this case, there is a concern that the target member 480 will interfere with the hub attachment portion 52 in the process of attaching the target member 480 to the hub bearing 40. In this embodiment, the target member 480 has a characteristic configuration for avoiding interference.

[0102] More specifically, the same number of interference avoidance portions 486 as the hub attachment portions 52 are formed in the radial direction of the target member 480 between the detection object portion 481 and the bearing insertion hole 483. The interference avoidance portions 486 are portions that are recessed radially outward from the periphery of the bearing insertion hole 483, and are portions that prevent the hub attachment portions 52 from interfering with the target member 480 when the outer cylindrical portion 51 is fitted into the bearing insertion hole 483.

[0103] To explain the manufacturing method of the detection device, the outer cylindrical portion 51 is fitted into the bearing insertion hole 483 so that the hub mounting portion 52 passes through the interference avoidance portion 486, and the target member 480 is brought into contact with the flange portion 62. This positions the head 17a of the hub bolt 17 closer to the flange portion than the recess 485 in the axial direction. Thereafter, as in the first embodiment, the target member 480 is fixed to the flange portion 62 by the disk member 210 and the target fixing bolt 213. The target member is not limited to that shown in FIG. 27 , and may be, for example, a target member such as the target members shown in FIGS. 16, 17, 20, and 21 configured as a single member, with an interference avoidance portion formed to prevent the hub mounting portion 52 from interfering with the target member 480.

[0104] Sixth Embodiment The sixth embodiment will be described below with reference to the drawings, focusing on the differences from the fifth embodiment. In this embodiment, the target member 580 is press-fitted and fixed into the second portion 61b of the inner cylindrical portion 61.

[0105] 29 and 30, target member 580 is a single member made of a metal material (e.g., aluminum or iron). Target member 580 has detection subject portion 581. Detection subject portion 581 has convex portions 584 and concave portions 585 alternately provided in the circumferential direction.

[0106] A bearing insertion hole 586, through which the second portion 61b is inserted, is formed in the center of the target member 580. Furthermore, an annular flat surface 588, against which the first portion 61a of the inner cylindrical portion 61 abuts, is formed in the target member 580 between the detection object portion 581 and the bearing insertion hole 586 in the radial direction.

[0107] The base end of the second portion 61b on the flange portion 62 side is an expanded diameter portion 587 having an outer diameter larger than that of the tip end of the second portion 61b.

[0108] Next, a method for manufacturing the detection device will be described.

[0109] 29 and 31, the second portion 61b is fitted into the bearing insertion hole 586 until the target member 580 reaches the enlarged diameter portion 587, and the target member 580 is press-fitted and fixed into the enlarged diameter portion 587. This positions the head 17a of the hub bolt 17 closer to the flange portion 62 than the flat surface of the recess 585 in the axial direction. As a result, some of the magnetic flux generated by the excitation coil 110 is less likely to flow to the hub bolt 17.

[0110] 32 and 33 is a sub-assembly that is an integrated member of the outer cylindrical portion 51, the rolling elements 41, and the first portion 61a. After the above press-fitting and fixing, the first portion 61a constituting the sub-assembly AS is press-fitted into the second portion 61b until the first portion 61a abuts against the flat surface 588 around the protrusion 584 of the target member 580. This completes the bearing assembly.

[0111] <Other embodiments> The above-described embodiments may be modified as follows.

[0112] In the first to fourth embodiments, the number of divisions of the target member is not limited to two, but may be, for example, three or four (eg, equally divided in the circumferential direction).

[0113] The sensor substrate 100 may be attached to the outer ring member 50 instead of the substrate attachment member 120 .

[0114] The target member 680 is not limited to those exemplified in the above embodiments, and may be, for example, the one shown in FIGS. 34 and 35 . The target member 680 in FIG. 34 is made of a metal material (e.g., aluminum or iron) and includes an annular ring portion 681 and a protruding portion 682 (corresponding to a "protrusion") protruding radially inward from the ring portion 681. A shielding portion 683 is formed between adjacent protruding portions 682 in the circumferential direction. The target member 680 is fixed to the flange portion 62. The protruding portion 682 protrudes toward the sensor board 100 in the axial direction relative to the flange portion 62. Note that the head of a hub bolt of the hub bearing may be located at the position of the shielding portion 683 when the target member 680 is viewed from the axial direction. The protruding portion 682 and the shielding portion 683 correspond to the "detection target portion."

[0115] The target member 780 in FIG. 35 is made of a metal material (for example, aluminum or iron) and includes an annular ring portion 781 and a protruding portion 782 (corresponding to a "convex portion") that protrudes radially outward from the ring portion 781. A shielding portion 783 is formed between two circumferentially adjacent protruding portions 782. The target member 780 is fixed to the flange portion 62. The protruding portion 782 protrudes toward the sensor substrate 100 in the axial direction relative to the flange portion 62. Note that the head of a hub bolt of the hub bearing may be located at the position of the shielding portion 783 when the target member 780 is viewed from the axial direction, for example. The protruding portion 782 and the shielding portion 783 correspond to the "detection target portion."

[0116] 34 and 35, a configuration may be adopted in which no object is provided from the shielding portion 683, 783 to the flange portion 62 in the axial direction, and when the target member 680, 780 is viewed from the axial direction, the flange portion 62 is visible from the shielding portion 683, 783. Also, in Figures 34 and 35, the shielding portion 683, 783 may be filled with a non-metallic material (for example, synthetic resin).

[0117] 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.

[0118] 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.

[0119] The disc rotor is not limited to a ventilated disc, but may be, for example, a solid disc made of a single circular plate.

[0120] As shown in FIG. 36, the head 17a of the hub bolt 17 may face outward in the vehicle width direction. Instead of the bolt insertion hole 64 shown in FIG. 2, the flange portion 62 has a female threaded hole 65 into which the male thread of the hub bolt 17 is screwed. The female threaded hole 65 opens outward in the vehicle width direction in the flange portion 62 of the hub bearing 40. The female threaded hole 65 extends to a midpoint of the flange portion 62 in the axial direction. The bottom surface portion 24 of the disc rotor 21 and the disc mounting portion 18 are sandwiched between the head 17a of the hub bolt 17 and the flange portion 62. This integrates the inner ring member 60 of the hub bearing 40, the disc rotor 21, and the wheel 11. In the configuration shown in FIG. 36, the tip of the male threaded side of the hub bolt 17 is located closer to the flange portion 62 than the flat surface 85a of the recess 85 of the target member 80 in the axial direction.

[0121] 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.

[0122] 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). [Explanation of symbols]

[0123] 10...wheel unit, 15...knuckle, 17...hub bolt, 40...hub bearing, 80...target member, 100...sensor board, 110...excitation coil, 111, 112...receiving coils

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 that is the direction of the rotational center axis of the hub bearing 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 radially outward from the second cylindrical portion; a rolling element (41) provided between the first cylindrical portion and the second cylindrical portion; a hub bolt (17) made of a magnetic material for fixing the rotating body to the flange portion; the second bearing member is rotatably supported relative to the base portion, a sensor substrate (100) provided at a position offset from the flange portion in the axial direction; a detection target portion (81, 181, 281, 381, 481, 581, 682, 683, 782, 783) that is provided in a portion of the flange portion that faces the sensor board in the axial direction and has an annular shape that extends in a circumferential direction of the second cylindrical portion around the rotation central axis; Equipped with the detection target portion is configured such that a plurality of convex portions (84, 184, 284, 384, 484, 584, 682, 782) projecting in the axial direction from the flange portion are provided at predetermined intervals in the circumferential direction, 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 flange portion is formed with a bolt insertion hole (64) that is a through hole extending in the axial direction and through which the hub bolt is inserted, A detection device in which, of both end portions of the hub bolt, the end portion on the sensor substrate side relative to the flange portion in the axial direction is located closer to the flange portion than the convex portion in the axial direction.

2. the detection target portion (84, 184, 284, 384, 484, 584) is configured such that the convex portions (84, 184, 284, 384, 484, 584) and concave portions (85, 185, 285, 385, 485, 585) that are recessed toward the flange portion with respect to the convex portions in the axial direction are alternately provided in the circumferential direction, The detection device according to claim 1 , wherein the end of the hub bolt that is closer to the sensor board than the flange in the axial direction is located closer to the flange than the recess in the axial direction.

3. a target member (180, 280) that is a separate member from the hub bearing and has an annular shape that extends in the circumferential direction around the rotation central axis; The detection object portion (184, 284) is formed at a position on the target member facing the sensor substrate in the axial direction, a counterbore portion (186, 286) that is recessed toward the flange portion side relative to the recess portion in the axial direction is formed radially inward of the recess portion (185, 285) and the protrusion portion (184, 284) that constitute the detection object portion of the target member, The counterbore portion has an inner insertion hole (187, 287) that penetrates the target member in the axial direction and through which the hub bolt is inserted, The peripheral edge of the inner insertion hole of the bottom of the countersunk portion (186a, 286a) serves as a bearing surface (187a, 287a) for the head (17a) of the hub bolt, 3. The detection device of claim 2, wherein the head of the hub bolt inserted through the inner insertion hole and the bolt insertion hole abuts against the seat surface, and the target member is sandwiched between the head and the flange portion, thereby fixing the target member to the flange portion.

4. a target member (380) that is a separate member from the hub bearing and has an annular shape that extends in the circumferential direction around the rotation central axis; The detection object portion (384) is formed at a position on the target member facing the sensor substrate in the axial direction, The recess has a counterbore (386) formed therein that is recessed toward the flange portion relative to the recess in the axial direction, The counterbore portion has a recessed insertion hole (387) that penetrates the target member in the axial direction and through which the hub bolt is inserted, The peripheral portion of the bottom (386a) of the counterbore portion around the recess insertion hole serves as a bearing surface (387a) for the head of the hub bolt, The detection device described in claim 2, wherein the head of the hub bolt inserted into the recess insertion hole and the bolt insertion hole abuts against the seat surface, and the target member is sandwiched between the head and the flange portion, thereby fixing the target member to the flange portion.

5. The target member (180, 280) has a peripheral wall portion (182, 282) extending from an outer peripheral edge portion of the detection target portion toward the flange portion in the axial direction, The detection device according to claim 3 , wherein the target member is fixed to the flange portion with the peripheral wall portion abutting against an outer peripheral edge portion of the flange portion from the outside in the radial direction.

6. the first cylindrical portion is provided radially outward of the second cylindrical portion, a hub mounting portion (52) extending radially outward is provided at an intermediate portion of the first cylindrical portion in the axial direction, The hub mounting portion has a female screw hole (52a) extending in the axial direction, into which a male screw of a bolt (16) for fixing the hub mounting portion to the base portion is screwed, a target member (480) that is a separate member from the hub bearing and has an annular shape that extends in the circumferential direction around the rotational central axis; the detection object portion is formed on the target member at a position facing the sensor substrate in the axial direction, A bearing insertion hole (483) is formed in the center of the target member, the bearing insertion hole (483) being a through hole extending in the axial direction and into which the first cylindrical portion is fitted, 3. The detection device of claim 2, wherein an interference avoidance portion (486) is formed in the target member between the detection object portion and the bearing insertion hole in the radial direction, the interference avoidance portion being recessed radially outward from the periphery of the bearing insertion hole, and preventing the hub mounting portion from interfering with the target member when the first cylindrical portion is fitted into the bearing insertion hole.

7. the first cylindrical portion is provided radially outward of the second cylindrical portion, a target member (580) that is provided in a portion of the flange portion that faces the sensor substrate in the axial direction and has an annular shape that extends in a circumferential direction of the second cylindrical portion around the rotation central axis; the detection object portion is formed on the target member at a position facing the sensor substrate in the axial direction, the target member is a separate member from the hub bearing, The hub bolt is inserted into the bolt insertion hole with the head (17a) of the hub bolt facing the sensor board side, A bearing insertion hole (586) is formed in the center of the target member, the bearing insertion hole (586) being a through hole extending in the axial direction and into which the outer cylindrical portion is fitted, The second cylindrical portion is a cylindrical first portion (61a) provided inside the rolling element in the radial direction; a cylindrical second portion (61b) provided inside the first portion in the radial direction and extending from the flange portion in the axial direction; and A base end portion of the second portion on the flange portion side is an expanded diameter portion (587) having an outer diameter dimension larger than that of a portion of the second portion on the tip side relative to the base end portion, when the first portion is fitted into the bearing insertion hole of the target member and the target member is press-fitted and fixed to the enlarged diameter portion, the head of the hub bolt is located closer to the flange portion than the recess in the axial direction, 3. The detection device according to claim 2, wherein a sub-assembly (AS) which is an integrated member of the first cylindrical portion, the rolling element, and the first portion abuts against the target member, and the first portion of the sub-assembly is press-fitted into the second portion.

8. The mechanical device is a wheel unit (10) having vehicle wheels (11, 14) as the rotating bodies, The detection device according to any one of claims 1 to 4, 6 and 7, wherein the base portion is a knuckle (15) of the vehicle.

9. 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 an outer ring member (50) that is a bearing member having an outer cylindrical portion (51) extending in an axial direction that is the direction of the rotation center axis of the hub bearing and that is fixed to the base portion; an inner ring member (60) that is a bearing member having an inner cylindrical portion (61) provided inside the outer cylindrical portion in a radial direction perpendicular to the axial direction, and a flange portion (62) extending from the inner cylindrical portion to the outside in the radial direction; A rolling element (41) provided between the outer cylindrical portion and the inner cylindrical portion; a hub bolt (17) made of a magnetic material for fixing the rotating body to the flange portion; the inner ring member is rotatably supported relative to the base portion, The detection device includes: a sensor substrate (100) provided at a position offset from the flange portion in the axial direction; a target member (480) that is provided in a portion of the flange portion that faces the sensor substrate in the axial direction and has an annular shape that extends in a circumferential direction of the inner cylindrical portion around the rotation central axis; Equipped with A detection target portion (481) having an annular shape and extending in the circumferential direction around the central axis of rotation is formed at a position of the target member facing the sensor substrate in the axial direction, The detection target portion is configured such that convex portions (484) protruding in the axial direction relative to the flange portion and concave portions (485) recessed toward the flange portion relative to the convex portions in the axial direction are alternately provided in the circumferential direction, 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 flange portion is formed with a bolt insertion hole (64) that is a through hole extending in the axial direction and through which the hub bolt is inserted, a hub mounting portion (52) extending radially outward is provided at an intermediate portion of the outer cylindrical portion in the axial direction, The hub mounting portion has a female screw hole (52a) extending in the axial direction, into which a male screw of a bolt (16) for fixing the hub mounting portion to the base portion is screwed, the target member is a separate member from the hub bearing, A bearing insertion hole (483) is formed in the center of the target member, the bearing insertion hole (483) being a through hole extending in the axial direction and into which the outer cylindrical portion is fitted, an interference avoidance portion (486) is formed in the target member between the detection object portion and the bearing insertion hole in the radial direction, the interference avoidance portion being a portion recessed outward in the radial direction from the periphery of the bearing insertion hole, for preventing the hub attachment portion from interfering with the target member when the outer cylindrical portion is fitted into the bearing insertion hole; The hub bolt is inserted into the bolt insertion hole with the head (17a) of the hub bolt facing the sensor board side, A method for manufacturing a detection device, comprising a step of fitting the outer cylindrical portion into the bearing insertion hole so that the hub mounting portion passes through the interference avoidance portion, and abutting the target member against the flange portion, thereby positioning the head of the hub bolt closer to the flange portion than the recess in the axial direction.

10. 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 an outer ring member (50) that is a bearing member having an outer cylindrical portion (51) extending in an axial direction that is the direction of the rotation center axis of the hub bearing and that is fixed to the base portion; an inner ring member (60) that is a bearing member having an inner cylindrical portion (61) provided inside the outer cylindrical portion in a radial direction perpendicular to the axial direction, and a flange portion (62) extending from the inner cylindrical portion to the outside in the radial direction; A rolling element (41) provided between the outer cylindrical portion and the inner cylindrical portion; a hub bolt (17) made of a magnetic material for fixing the rotating body to the flange portion; the inner ring member is rotatably supported relative to the base portion, The detection device includes: a sensor substrate (100) provided at a position offset from the flange portion in the axial direction; a target member (580) that is provided in a portion of the flange portion that faces the sensor substrate in the axial direction and has an annular shape that extends in a circumferential direction of the inner cylindrical portion around the rotation central axis; Equipped with A detection target portion (581) having an annular shape and extending in the circumferential direction around the rotation central axis is formed at a position of the target member facing the sensor substrate in the axial direction, The detection target portion is configured such that convex portions (584) protruding in the axial direction relative to the flange portion and concave portions (585) recessed toward the flange portion relative to the convex portions in the axial direction are alternately provided in the circumferential direction, 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 flange portion is formed with a bolt insertion hole (64) that is a through hole extending in the axial direction and through which the hub bolt is inserted, the target member is a separate member from the hub bearing, The hub bolt is inserted into the bolt insertion hole with the head (17a) of the hub bolt facing the sensor board side, A bearing insertion hole (586) is formed in the center of the target member, the bearing insertion hole (586) being a through hole extending in the axial direction and into which the outer cylindrical portion is fitted, The inner cylindrical portion is a cylindrical first portion (61a) provided inside the rolling element in the radial direction; a cylindrical second portion (61b) provided inside the first portion in the radial direction and extending from the flange portion in the axial direction; and A base end portion of the second portion on the flange portion side is an expanded diameter portion (587) having an outer diameter dimension larger than that of a portion of the second portion on the tip side relative to the base end portion, a step of fitting the first portion into the bearing insertion hole of the target member and press-fitting the target member into the enlarged diameter portion, thereby positioning the head of the hub bolt closer to the flange portion than the recess in the axial direction; a step of press-fitting the first portion of the sub-assembly (AS) into the second portion until the sub-assembly (AS) is a member in which the outer cylindrical portion, the rolling elements, and the first portion are integrated, and the sub-assembly abuts against the target member; A method for manufacturing a detection device, comprising:

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