Detection device and module including detection device

Abstract

To provide a detection device that can effectively utilize a dead space around a bearing.SOLUTION: A detection device includes a target member 80 and a detection unit 90. The target member 80 is provided in an arrangement space being a space adjacent to a second end side of an inner cylindrical portion 61 in an axial direction with respect to a flange portion 62 and being an outer space relative to an outer cylindrical portion 51 in a radial direction. The detection unit 90 is provided at a position facing the target member 80 in the axial direction in the arrangement space. The detection unit 90 outputs a voltage signal corresponding to the relative displacement of the target member 80 with respect to the detection unit 90.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a detection device and a module comprising the detection device. [Background technology]

[0002] Conventionally, a mechanical device is known that includes a bearing that rotatably supports a rotor relative to a base. The mechanical device includes an annular displacement detection part and a sensor device that detects radial and axial displacements of the displacement detection part. A mechanical device with a sensor device is described in, for example, Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-275508 A Summary of the Invention [Problem to be solved by the invention]

[0004] Depending on the arrangement of the sensor device around the bearing, it may not be possible to effectively utilize the dead space around the bearing.

[0005] A primary objective of the present disclosure is to provide a detection device and module that can effectively utilize the dead space around a bearing. [Means for solving the problem]

[0006] The present disclosure relates to a detection device applied to a mechanical device, The mechanical device comprises: A rotating body; a bearing member that rotatably supports the rotor relative to a base portion; Equipped with the bearing member has a cylindrical portion extending in an axial direction of the bearing member, and a flange portion extending in a radial direction of the bearing member from a first end of the cylindrical portion in the axial direction and to which the rotating body is fixed, and supports the cylindrical portion and the flange portion rotatably relative to the base portion; The flange portion extends radially outward beyond the cylindrical portion, a target member provided in an arrangement space that is adjacent to the flange portion on a side of the second end of the cylindrical portion in the axial direction and is an outer space than the cylindrical portion in the radial direction; a displacement detection unit provided in the arrangement space at a position facing the target member in the axial direction; Equipped with the target member has an annular shape extending in a circumferential direction of the bearing member about a rotation center of the bearing member, one of the target member and the displacement detection unit is fixed to the flange portion, and the other is fixed to the base portion; The displacement detection section outputs a voltage signal corresponding to a relative displacement of the target member with respect to the displacement detection section.

[0007] The arrangement space is a space adjacent to the flange portion in the axial direction on the second end side of the cylindrical portion and radially outward of the cylindrical portion. In the present disclosure, the arrangement space can be effectively utilized as a space for providing a target member and a displacement detection unit that outputs a voltage signal corresponding to the relative displacement of the target member. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a perspective view of a wheel unit according to the first embodiment. [Diagram 2] FIG. [Diagram 3] FIG. 4 is an enlarged partial view of the vicinity of the hub bearing of the wheel unit. [Figure 4] FIG. [Diagram 5]FIG. 2 is a perspective view of a sensor-equipped bearing module. [Figure 6] FIG. 2 is a perspective view of a sensor-equipped bearing module. [Figure 7] FIG. 2 is an exploded perspective view of a sensor-equipped bearing module. [Figure 8] FIG. 2 is an exploded perspective view of a sensor-equipped bearing module. [Figure 9] FIG. 4 is a perspective view showing a mounting manner of the ring member. [Figure 10] FIG. [Figure 11] FIG. 2 is a diagram showing the electrical configuration of a detection unit and a processing unit. [Figure 12] FIG. 13 is a diagram showing a state in which an inner wheel is tilted relative to an outer wheel when a lateral force is applied to a tire. [Figure 13] 4 is a diagram showing the vertical displacement of an inner wheel when a vertical load acts on a tire. FIG. [Figure 14] 4 is a projection view of an excitation coil and first and second receiving coils in a plan view of a multilayer substrate. FIG. [Figure 15] FIG. 2 is a diagram showing wiring patterns and vias formed on the first layer of a multilayer substrate. [Figure 16] FIG. 4 is a diagram showing wiring patterns and vias formed on the second layer of a multilayer substrate. [Figure 17] FIG. 13 shows the wiring patterns and vias formed on the third layer of a multilayer substrate. [Figure 18] FIG. 13 is a diagram showing wiring patterns and vias formed on the fourth layer of a multilayer board. [Figure 19] 4 is a diagram showing the relative positional relationship between the first and second receiving coils and a shielding portion. [Figure 20] 4A and 4B are diagrams for explaining the principle of detecting displacement and rotation angle. [Figure 21] 4A and 4B are diagrams for explaining the principle of detecting displacement and rotation angle. [Figure 22] FIG. 4 is a plan view of a simplified second receiver coil. [Figure 23] FIG. 4 is a diagram showing the output voltage signal of a receiving coil and the transition of the envelope of this signal. [Figure 24] FIG. 13 is a graph showing the transitions of the first and second envelopes. [Diagram 25] FIG. 4 is a characteristic diagram showing the relationship between a displacement signal and an axial displacement. [Figure 26] FIG. 13 is a diagram showing a change in an envelope from a reference state when a lateral force is applied. [Figure 27] 6 is a diagram showing the relative positional relationship between the first and second receiving coils and the protrusion when a vertical load is applied. [Figure 28] FIG. 13 is a diagram showing the change in the envelope from the reference state when a vertical load is applied. [Figure 29] FIG. 4 is a characteristic diagram showing the relationship between a displacement signal and a vertical displacement. [Diagram 30] 13 is a diagram showing characteristic information linking the first and second displacement signals with the respective displacements ΔY and ΔZ, the lateral force, and the vertical load. FIG. [Diagram 31] 5 is a flowchart showing a procedure for load and rotation speed calculation processing. [Diagram 32] FIG. 11 is a partially enlarged view of the vicinity of a hub bearing of a wheel unit according to a second embodiment. [Diagram 33] FIG. 11 is an exploded perspective view of a sensor-equipped bearing module according to a third embodiment. [Diagram 34] FIG. 2 is a perspective view of a sensor-equipped bearing module. [Diagram 35] FIG. 11 is a vertical cross-sectional view of a wheel unit according to a fourth embodiment. [Diagram 36] FIG. 13 is a vertical cross-sectional view of a wheel unit according to a fifth embodiment. [Figure 37] FIG. 11 is a vertical cross-sectional view of a wheel unit according to another embodiment. [Figure 38] FIG. 11 is a plan view of a target member according to another embodiment. [Figure 39] FIG. 11 is a partially enlarged view of the vicinity of a hub bearing of a wheel unit according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Several embodiments will be described with reference to the drawings. In several embodiments, functionally and / or structurally corresponding and / or associated parts may be given the same reference numerals or reference numerals with different digits of 100 or more. For corresponding and / or associated parts, the description of other embodiments may be referred to.

[0010] 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 capable of calculating a force acting on a wheel (drive wheel or driven wheel) as a rotating body. 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. In addition, the use of the vehicle is not limited to passenger use.

[0011] The wheel unit 10 as a mechanical device will be described with reference to Fig. 1 to Fig. 3. Fig. 1 is a perspective cross-sectional view in which the wheel unit 10 is partially cut, and Fig. 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. Fig. 3 is a partially enlarged view of Fig. 2.

[0012] The wheel unit 10 includes a wheel 11 and a tire 14. 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 attachment portion 18 located in the center of the disc portion 13, and spoke portions 19 extending radially from the disc attachment portion 18 to the rim portion 12. The tire 14 is attached to the outer periphery of the rim portion 12.

[0013] The wheel unit 10 includes a brake device 20 and a hub bearing 40 (corresponding to a "bearing member"). The brake device 20 is a disc-type friction braking device, and includes a disc rotor 21 that is disk-shaped 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 a 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.

[0014] In the following, the direction in which the rotational axis of the hub bearing 40 extends is referred to as the axial direction, the direction extending radially from the rotational axis is referred to as the radial direction, and the direction extending circumferentially around the rotational axis is referred to as the circumferential direction.

[0015] The disk rotor 21 of this embodiment is a ventilated disk having a cavity therein for ventilation. The disk 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 disk peripheral wall portion 25. An attachment hole 26 is formed in the center of the bottom surface portion 24. Through holes 27 are formed around the attachment hole 26 in a line in the circumferential direction. The disk rotor 21 is connected to the hub bearing 40 using the attachment holes 26 and the through holes 27. The disk peripheral wall portion 25 is cylindrical and extends from the outer circumferential edge portion of the bottom surface portion 24, forming the peripheral surface of the hat portion 22.

[0016] The sliding portion 23 is connected to the end of the disk peripheral wall portion 25 opposite to the bottom surface portion 24. The sliding portion 23 is formed to protrude outward in an annular shape from the disk 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 disk pad.

[0017] The sliding part 23 includes an inner disk part 28, an outer disk part 29 disposed on the outer side of the inner disk part 28, and fins 30. The fins 30 connect the inner disk part 28 and the outer disk part 29 at a plurality of points in the circumferential direction. The fins 30 extend radially, and the space surrounded by the inner disk part 28, the outer disk part 29, and the fins 30 forms an air passage penetrating in the radial direction (diameter direction). The air passage is a passage extending from an air intake port 31 formed on the radial inside of the sliding part 23 to an air exhaust port 32 formed on the radial outside.

[0018] Hub bearing 40 is a rolling bearing (specifically, a radial ball bearing) and includes an outer ring 50 (corresponding to the "second bearing portion"), an inner ring 60 (corresponding to the "first bearing portion"), and a plurality of rolling elements 41 (specifically, balls) arranged between the outer ring 50 and the inner ring 60. Hub bearing 40 may also be a radial roller bearing including rollers as the rolling elements 41.

[0019] The inner ring 60 includes an inner cylindrical portion 61 (corresponding to a "first 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 through hole 62 penetrating in the axial direction is formed in the inner cylindrical portion 61. A spline is formed on the inner peripheral surface of the through hole 62. Note that a shaft (not shown) to which rotational power of a driving power source such as a motor is transmitted is fitted in the through hole 62.

[0020] The outer ring 50 has an outer cylindrical portion 51 (corresponding to a "second cylindrical portion") provided at a position facing the inner cylindrical portion 61 on the radially outward side. A rolling element 41 is provided between the outer cylindrical portion 51 and the inner cylindrical portion 61. The outer ring 50 has a hub mounting portion 52 that protrudes radially outward from the outer cylindrical portion 51. The hub mounting portion 52 is fixed with bolts 16 to a knuckle 15 serving as a base portion.

[0021] The flange portion 62 is disk-shaped and extends radially outward beyond the outer cylindrical portion 51. The flange portion 62 has through holes 63 arranged in the circumferential direction, through which the hub bolts 17 for fixing the wheel 11 are inserted.

[0022] The wheel unit 10 includes a heat shield 35. The heat shield 35 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 heat shield 35 extends radially outward beyond the outer circumferential edge of the sliding portion 23.

[0023] The wheel unit 10 includes a detection device. The detection device is provided in the inner space of the wheel 11, and includes a target member 80 and a detection unit 90 (corresponding to a "displacement detection unit"). The detection device is a device for detecting the rotation speed of the wheel consisting of the wheel 11 and the 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, vertical load Fz). The direction in which the lateral force acts is perpendicular to the direction in which the vertical load acts. For example, the calculated rotation speed, lateral force, and vertical load are used for driving control of the vehicle, which is a moving body, in a control device (specifically, an ECU: Electronic Control Unit) provided in the vehicle. Hereinafter, the structure of the detection device will be described with reference to Figs. 1 to 6.

[0024] The target member 80 is made of a metal material (e.g., aluminum or iron). The target member 80 includes a detection rotating part 81 and an inner peripheral wall part 82. The detection rotating part 81 is provided at a position facing the detection unit 90 in the axial direction without contacting the detection unit 90, and forms an annular shape extending in the circumferential direction centered on the central axis of rotation of the hub bearing 40. The inner peripheral wall part 82 extends in the axial direction from the outer peripheral edge part of the detection rotating part 81 toward the flange part 62. A through hole 83 is formed in the center of the detection rotating part 81, penetrating in the axial direction. The tip part of the inner cylindrical part 61 is inserted into the through hole 83.

[0025] The detection rotating portion 81 has protrusions 84 arranged in a circumferential direction, protruding from a flat surface of the detection rotating portion 81 in the axial direction (inward in the vehicle width direction). The flat surfaces between the protrusions 84 arranged in the circumferential direction are recesses 85. The protrusions 84 and the recesses 85 are arranged alternately in the circumferential direction. In this embodiment, twelve pairs of protrusions 84 and recesses 85 are provided.

[0026] 4, LCi indicates the center axis of the inner ring 60. In this embodiment, an angle α1 between the center axis LCi and an axis passing through one circumferential end of the protruding portion 84 and an axis passing through the center axis LCi and the other circumferential end of the protruding portion 84 is equal to an angle α2 between the axis passing through the center axis LCi and one circumferential end of the recessed portion 85 and an axis passing through the center axis LCi and the other circumferential end of the recessed portion 85. Therefore, the circumferential length of the multiple protruding portions 84 and the circumferential length of the multiple recessed portions 85 are equal to each other.

[0027] The detection device includes a ring member 86 as a fixing member for fixing the target member 80 to the flange portion 62. The ring member 86 includes a disk portion 87 and an outer peripheral wall portion 88. A through hole 87a is formed in the center of the disk portion 87, penetrating in the axial direction. The tip end of the inner cylindrical portion 61 is inserted into the through hole 87a.

[0028] A mounting surface 62a, which is a circular flat surface extending in the circumferential direction, is formed on a portion of the flange portion 62 opposite the detection unit 90 in the axial direction. A circular first surface 87b of the disc portion 87 abuts (specifically, surface contacts) against the mounting surface 62a of the flange portion 62. A first surface 24a of the bottom surface portion 24 constituting the disc rotor 21 abuts (specifically, surface contacts) against a second surface 87c, which is the back surface of the first surface 87b, of the disc portion 87. A mounting surface 18a, which is a flat surface of the disc mounting portion 18, of the disc mounting portion 18 abuts (specifically, surface contacts) against a second surface 87c, which is the back surface of the first surface 24a, of the bottom surface portion 24.

[0029] In the disk portion 87 constituting the ring member 86, through holes 87d penetrating in the axial direction are formed in a line in the circumferential direction around the through hole 87a. With the bottom surface portion 24, the disk portion 87 and the flange portion 62 overlapping with the disk mounting portion 18, the hub bolt 17 is inserted into the through holes 63, 87d and 27. The nut 34 is screwed onto the hub bolt 17, thereby fixing the disk rotor 21, the ring member 86 and the hub bearing 40 to the disk mounting portion 18. As a result, the target member 80, the disk rotor 21 and the inner ring 60 are made coaxial, and the target member 80, the disk rotor 21 and the wheel 11 rotate together.

[0030] The outer peripheral wall portion 88 is cylindrical and extends axially from the outer peripheral edge of the disk portion 87 toward the detection unit 90. The outer peripheral surface of the inner peripheral wall portion 82 is pressed against the inner peripheral surface of the outer peripheral wall portion 88, thereby fixing the target member 80 to the flange portion 62. The outer peripheral wall portion 88 does not protrude from the flange portion 62 when viewed from the front of the mounting surface 62a.

[0031] The outer peripheral wall portion 88 extends in the axial direction to a position covering the radial outside of the detection unit 90. This makes it possible to protect the detection unit 90 from heat generated by the brake device 20 (for example, the disc rotor 21) and foreign matter.

[0032] 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. In addition, the detection unit 90 is provided at a position separated from the brake caliper 33 in the circumferential direction.

[0033] The target member 80 is provided at a position radially opposite to the air intake 31 of the disk rotor 21. This makes it possible to cool the target member 80 and the detection unit 90 housed in the ring member 86 by utilizing the wind guided through the air intake 31.

[0034] The inner peripheral wall portion 82 abuts against the outer circumferential edge portion of the flange portion 62 from the outside in the radial direction.

[0035] 3, a step portion 88a is formed at the base end of the outer peripheral wall portion 88, which protrudes radially inward and is used to press-fit and fix the tip end of the inner peripheral wall portion 82. The step portion 88a is formed, for example, over the entire circumferential area.

[0036] In this embodiment, the material of the inner peripheral wall portion 82 and the material of the outer peripheral wall portion 88 are the same (for example, aluminum). In this case, the linear expansion coefficients of the peripheral wall portions 82, 88 are the same, so that it is possible to prevent the peripheral wall portions 82, 88 from being damaged by thermal stress in high and low temperature environments and to prevent the ring member 86 from coming off the target member 80 due to loosening of the press fit.

[0037] In this embodiment, the target member 80 is divided into two in the circumferential direction as shown in Fig. 4, more specifically, the two are divided into two parts having equal circumferential lengths. The reason for dividing the target member 80 is to facilitate the assembly work 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 members of the target member 80 will be referred to as a first divided member 80A, and the other member will be referred to as a second divided member 80B.

[0038] 4, in this embodiment, the convex portion 84 is not formed across the boundary surface between the first and second divided members 80A, 80B. This makes it difficult for steps to occur on the surface of the convex portion 84, thereby improving the detection accuracy of the displacement, etc., by the detection unit 90. Note that the convex portion 84 may be formed across the boundary surface.

[0039] The detection unit 90 is a so-called eddy current inductive sensor, and includes a substrate 91, a coil section 92 provided on the substrate 91, and a circuit section 93, as shown in FIG.

[0040] 3 and 6, the substrate 91 is provided such that the plate surface of the substrate 91 extends in the up-down direction. The substrate 91 is provided in an arrangement space that is adjacent to the flange portion 62 on the inner side in the vehicle width direction and is a space radially outboard of the inner cylindrical portion 61 and the outer cylindrical portion 51. In the arrangement space, the target member 80 is provided at a position facing the substrate 91 in the axial direction. In this embodiment, the substrate 91 is provided at a position facing the upper end portion of the target member 80 in the axial direction.

[0041] The board 91 is provided between the flange portion 62 and the hub mounting portion 52. This allows for effective use of the space inside the flange portion 62 in the vehicle width direction. Of the outer cylindrical portion 51, a board mounting portion 53 that protrudes in the radial direction is provided between the hub mounting portions 52 that are lined up in the circumferential direction. The board mounting portion 53 is provided at a position that does not overlap with the hub mounting portion 52 in the circumferential direction.

[0042] The substrate 91 has an arc shape that fits along the detection rotating portion 81. A through hole 91a is formed at both circumferential ends of the substrate 91. A female screw hole 53a is formed in the substrate attachment portion 53. With a bolt 99 inserted into the through hole 91a, the male screw of the bolt 99 is screwed into the female screw hole 53a, whereby both circumferential ends of the substrate 91 are fixed to the substrate attachment portion 53.

[0043] A method for manufacturing a sensored bearing module including a hub bearing 40, a target member 80, a detection unit 90 and a ring member 86 will now be described.

[0044] 7 and 8, board 91 is fixed to board attachment portion 53 with bolts 99. Furthermore, the portion of outer cylindrical portion 51 closer to flange portion 62 than hub attachment portion 52 is sandwiched between first and second separate members 80A, 80B, and the tip portions of inner peripheral wall portions 82 of first and second separate members 80A, 80B are brought into contact with the outer circumferential edge portion of flange portion 62.

[0045] 9, the hub bolts 17 are inserted into the through holes 87d of the disc portion 87, and the tip end of the inner cylindrical portion 61 is inserted into the through hole 87a in the center of the disc portion 87. With this in mind, the ring member 86 is pressed into the hub bearing 40 until the tip end of the inner peripheral wall portion 82 abuts against the first surface 87b of the disc portion 87. In this case, the ring member 86 is press-fitted and fixed into the target member 80 by the stepped portion 88a of the outer peripheral wall portion 88. As a result, the hub bearing 40 and the target member 80 are integrated.

[0046] The mounting surface 62a of the flange portion 62 is a portion necessary for mounting the wheel 11, and has a relatively high degree of flatness. Since the ring member 86 is assembled using such mounting surface 62a, it is possible to improve the detection accuracy of the detection device while minimizing the need to change the structure of the hub bearing 40 in order to mount the detection device.

[0047] Next, the electrical configuration of the detection unit 90 will be described with reference to FIGS.

[0048] In the detection unit 90, the coil section 92 includes an excitation coil 100 and a receiving coil. In this embodiment, the receiving coils are a first receiving coil 110 and a second receiving coil 120. Each of the coils 100, 110, 120 is a planar coil. The substrate 91 is a multi-layer substrate. Each of the coils 100, 110, 120 is formed by wiring patterns and vias formed on each layer of the substrate 91. Since each of the coils 100, 110, 120 is a planar coil, it is easy to arrange each of the coils 100, 110, 120 even when a large space cannot be secured in the axial direction in the inner space of the wheel 11.

[0049] The circuit unit 93 is composed of an integrated circuit. As shown in Fig. 11, the circuit unit 93 includes an excitation circuit 94 that supplies a high-frequency excitation voltage to the excitation coil 100, and a receiving circuit 95. When an excitation voltage is supplied to the excitation coil 100, an excitation current flows through the excitation coil 100, and a voltage having the same or equivalent frequency as the excitation voltage is induced in each of the coils 110, 120. The receiving circuit 95 detects output voltage signals at both ends of each of the coils 110, 120.

[0050] 11, the circuit unit 93 is provided with a connector 96 electrically connected to an excitation circuit 94 and a receiving circuit 95. The connector 96 is electrically connected to the processing unit 70 via a cable 97. The circuit unit 93 and the processing unit 70 exchange signals via the cable 97.

[0051] 6, the connector 96 is provided at a position that does not overlap with the hub mounting portion 52 and the board mounting portion 53 in the circumferential direction. This prevents the connector 96 and the cable 97 from interfering with the hub mounting portion 52 and the board mounting portion 53.

[0052] 1, an insertion hole 35a is formed in the heat shield 35, and the processing unit 70 and the circuit unit 93 are electrically connected via a cable 97 inserted through the insertion hole 35a. The insertion hole 35a is formed in a position of the heat shield 35 facing the connector 96 in the axial direction. This makes it easy to route the cable 97 in the wheel unit 10. The processing unit 70 may be provided on the vehicle body, or may be built into the wheel unit 10.

[0053] The processing unit 70 includes a CPU (Central Processing Unit). The functions provided by the processing unit 70 can be provided by software recorded in a physical memory device and a computer that executes the software, by software alone, by hardware alone, or by a combination of these. For example, when the microcomputer of the processing unit 70 is provided by an electronic circuit that is hardware, it can be provided by a digital circuit including a large number of logic circuits, or an analog circuit. For example, the microcomputer executes a program stored in a non-transitory tangible storage medium as a storage unit provided in the microcomputer. The program includes, for example, a program of a process shown in FIG. 31, which will be described later. A set of instructions that constitute the program is executed, thereby executing 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, OTA (Over The Air), etc.

[0054] When a lateral force Fy acts on the wheel as shown in Fig. 2, the inclination θ of the central axis LCi of the inner wheel 60 relative to the central axis LCo of the outer wheel 50 increases as shown in Fig. 12. In this case, the axial distance between each of the coils 110, 120 and the detection rotating part 81 of the target member 80 changes, and the amplitude of the output voltage signal of each of the coils 110, 120 changes. The processing unit 70 calculates the axial displacement ΔY of the target member 80 based on this change in amplitude, and calculates the lateral force Fy based on the calculated axial displacement ΔY.

[0055] On the other hand, when a vertical load Fz acts on the wheel, as shown in Fig. 13, the central axis LCi of the inner wheel 60 is displaced in a direction perpendicular to the central axis LCo of the outer wheel 50. As a result, the target member 80 fixed to the flange portion 62 is also displaced. In this case, the detection unit 90 is configured so that the amplitude of the output voltage signals of the first receiving coil 110 and the second receiving coil 120 changes. This configuration will be described in detail later. Based on this change in amplitude, the processing unit 70 calculates the displacement of the target member 80 in the axial direction and in the direction perpendicular to the vehicle length direction (hereinafter, the vertical displacement ΔZ), and calculates the vertical load Fz based on the calculated vertical displacement ΔZ.

[0056] 14, the first receiving coil 110 and the second receiving coil 120 are provided in an area surrounded by the exciting coil 100 in a plan view of the substrate 91. The exciting coil 100 is a planar coil having a plurality of turns, and has an arc shape extending in the circumferential direction of the outer ring.

[0057] Next, the coil section 92 will be described with reference to Fig. 14 to Fig. 19. In this embodiment, the substrate 91 is a multi-layer substrate (specifically, a four-layer substrate), and the excitation coil 100 and the receiving coils 110, 120 constituting the coil section 92 are configured by wiring patterns on the multi-layer substrate. An example of the configuration of the coil section 92 will be described below.

[0058] 15 to 18 show the wiring patterns formed on each layer in a plan view of the plate surface of the substrate 91. Fig. 14(a) is a diagram in which the wiring patterns of the second to fourth layers are projected onto the wiring pattern of the first layer.

[0059] First, the excitation coil 100 will be described. As shown in FIG. 15 and FIG. 16, the excitation coil 100 is formed in the first and second layers adjacent to each other in the thickness direction of the substrate 91. The wiring patterns of each layer are electrically connected by a conductor filled in the excitation side via VI. In the first layer, a first excitation end 101 electrically connected to the excitation circuit 94 and a first excitation pattern 102 formed by winding multiple times (three times) clockwise from the first excitation end 101 to the excitation side via VI are formed as the wiring pattern. In the second layer, a second excitation end 103 electrically connected to the excitation circuit 94 and a second excitation pattern 104 formed by winding multiple times (three times) counterclockwise from the second excitation end 103 to the excitation side via VI are formed. As a result, the excitation coil 100, which is a six-turn planar coil, is formed on the substrate 91. The excitation coil 100 is formed in an arc shape extending in the circumferential direction of the outer ring 50.

[0060] Next, the first receiving coil 110 will be described. As shown in Figs. 15 to 18, the first receiving coil 110 is formed in the first to fourth layers. As shown in Fig. 17, a first receiving end portion 111 electrically connected to the receiving circuit 95 is formed in the third layer. A first end of a pattern 112 in the first layer is connected to the first receiving end portion 111 through a first A via VA1. A first end of a pattern 113 in the second layer is connected to a second end of the pattern 112 through a second A via VA2. A first end of a pattern 115 in the first layer is connected to a second end of the pattern 113 through a third A via VA3, a pattern 114, and a fourth A via VA4. A first end of a pattern 116 in the second layer is connected to a second end of the pattern 115 through a fifth A via VA5. A second end of the pattern 116 is connected to a second receiving end portion 118 in the fourth layer through a sixth A via VA6, a pattern 117, and a seventh A via VA7. The second receiving end 118 is connected to the receiving circuit 95. The receiving circuit 95 detects the potential difference between the first receiving end 111 and the second receiving end 118 as a first output voltage signal v1.

[0061] As shown in FIG. 14(a), the first receiving coil 110 is provided in an area surrounded by the excitation coil 100 in a plan view of the substrate 91. When an excitation voltage is supplied to the excitation coil 100, the first receiving coil 110 is composed of a first portion that generates a voltage of a first polarity between the first receiving end 111 and the second receiving end 118 of the first receiving coil 110, and a second portion that generates a voltage of a second polarity opposite to the first polarity. In detail, as shown in FIG. 14(b), in a plan view of the substrate 91, the central portion in the circumferential direction of the first receiving coil 110 is the first portion 110A of one turn, and both ends of the first portion 110A of the first receiving coil 110 are the second portion 110B of the same number of turns (one turn) as the first portion 110A. As a result, the pattern shape of the first and second portions 110A, 110B on one side and the pattern shape of the first and second portions 110A, 110B on the other side are symmetrical with respect to the circumferential central axis Lt of the first receiving coil 110.

[0062] Next, the second receiving coil 120 will be described. As shown in Figs. 15 to 18, the second receiving coil 120 is formed in the first to fourth layers. As shown in Fig. 17, a third receiving end 121 electrically connected to the receiving circuit 95 is formed in the third layer. A first end of a pattern 122 in the second layer is connected to the third receiving end 121 through a 1B via VB1. A first end of a pattern 123 in the first layer is connected to a second end of the pattern 122 through a 2B via VB2. A first end of a pattern 125 in the first layer is connected to a second end of the pattern 123 through a 3A via VA3, a pattern 124, and a 4B via VB4. A first end of a pattern 126 in the second layer is connected to a second end of the pattern 125 through a 5B via VB5. A fourth receiving end 128 in the fourth layer is connected to a second end of the pattern 126 through a 6B via VB6, a pattern 127, and a 7B via VB7. The fourth receiving end 128 is connected to the receiving circuit 95. The receiving circuit 95 detects the potential difference between the third receiving end 121 and the fourth receiving end 128 as a second output voltage signal v2.

[0063] 14(a), the second receiver coil 120 is provided in an area surrounded by the excitation coil 100 in a plan view of the substrate 91. The circumferential length of the second receiver coil 120 is the same as the circumferential length of the first receiver coil 110. The radial length of the second receiver coil 120 is greater than the radial length of the first receiver coil 110.

[0064] 14(c), the second receiving coil 120 is composed of a first portion 120A and a second portion 120B, similar to the first receiving coil 110. In a plan view of the substrate 91, one side of the second receiving coil 120 with respect to a central axis Lt in the circumferential direction is the first portion 120A, and the other side is the second portion 120B.

[0065] In the first receiving coil 110 and the second receiving coil 120, the circumferential length from the central axis Lt to the circumferential end is the same as the circumferential length of each of the convex portion 84 and the concave portion 85. In addition, as shown in FIG. 14(a), the positions of both ends in the circumferential direction of the second receiving coil 120 are the same as the positions of both ends in the circumferential direction of the first receiving coil 110 in a plan view of the substrate 91.

[0066] The substrate 91 is provided so that the central axis Lt in the circumferential direction of the first and second receiving coils 110, 120 and the upper end portion of the detection rotating portion 81 face each other in the axial direction.

[0067] In a plan view of the substrate 91, the position of the radially outer end of the second receiving coil 120 is on a first concentric circle C1 centered on the central axis line LCo of the outer ring 50, as shown in FIG. 19. The position of the radially outer end of the first receiving coil 110 is on a second concentric circle C2 centered on the central axis line LCo. The radius of the second concentric circle C2 is smaller than the radius of the first concentric circle C1. The position of the radially inner end of the first receiving coil 110 is on a third concentric circle C3 centered on the central axis line LCo. The radius of the third concentric circle C3 is smaller than the radius of the second concentric circle C2. The position of the radially inner end of the second receiving coil 120 is on a fourth concentric circle C4 centered on the central axis line LCo. The radius of the fourth concentric circle C4 is smaller than the radius of the third concentric circle C3.

[0068] The radially outer end of the second receiving coil 120 protrudes from the radially outer end 84a of the protrusion 84 in the reference state. The reference state can be set arbitrarily. The reference state is, for example, a state in which the vehicle is stopped, and more specifically, a state in which the vehicle is stopped on a horizontal road surface. CP shown in FIG. 19 is a concentric circle CP that is centered on the central axis LCo of the outer ring 50 and passes through the radially outer end 84a of the protrusion 84 in the reference state.

[0069] Next, the principle by which the detection unit 90 can detect the displacement, rotation angle, and rotation speed will be described with reference to FIGS.

[0070] First, an overview of this principle will be given using Figures 20 and 21. As shown in Figure 20, when a high-frequency excitation voltage vr(t) is supplied to the excitation coil, a high-frequency current flows through the excitation coil. This current generates a magnetic flux φ(t), which interlinks with the receiving coil. A voltage ve(t) proportional to the time rate of change of the interlinked magnetic flux is induced at both ends of the receiving coil.

[0071] Figure 21 shows a state where a protrusion, which is a metal part, faces a part of the receiving coil. In the part of the protrusion facing the receiving coil, an eddy current flows due to the interlinkage magnetic flux caused by the energization of the excitation coil. This eddy current generates a magnetic flux in a direction that weakens the magnetic flux that generates an induced voltage in the receiving coil, reducing the amplitude of the induced voltage in the receiving coil. In other words, the amplitude of the potential difference between both ends of the receiving coil is proportional to the area of ​​the receiving coil that does not face the protrusion.

[0072] Based on the explanations of Figs. 20 and 21, the detection principle will be explained using Figs. 22 and 23, taking the second receiving coil 120 as an example. Figs. 22 and 23 are diagrams showing the second receiving coil 120 and the convex portion 84 shown in Fig. 14 etc., with the circumferential direction being linear. Fig. 23 is a diagram showing the relative positional relationship between the second receiving coil 120 and the convex portion 84, and the transition of the second output voltage signal v2 of the second receiving coil 120.

[0073] 22 and 23, the direction (I+) in which current flows from the second receiving end 118 to the first receiving end 111 is referred to as the positive direction, and the direction (I-) in which current flows from the first receiving end 111 to the second receiving end 118 is referred to as the negative direction. In addition, in Figs. 22 and 23, magnetic flux from the excitation coil 100 passes from the front side to the back side of the paper.

[0074] 23, the central half of the first portion 120A and the central half of the second portion 120B face the convex portion 84. A voltage that causes a current to flow in a positive direction is induced in the first portion 120A, and a voltage that causes a current to flow in a negative direction is induced in the second portion 120B. As a result, the induced voltages generated in the first portion 120A and the second portion 120B cancel each other out, and the amplitude of the second output voltage signal v2 becomes zero.

[0075] At time t2, of the first portion 120A and the second portion 120B, the second portion 120B faces the convex portion 84. In this case, a voltage that attempts to pass a current in the positive direction is induced in the first portion 120A, and the induced voltage in the second portion 120B becomes zero. As a result, the amplitude of the second output voltage signal v2 becomes a maximum value on the first polarity (positive polarity) side. This maximum value becomes larger as the target member 80 approaches the second receiving coil 120.

[0076] At time t3, the half of the end side of the first portion 120A and the half of the end side of the second portion 120B face the convex portion 84. A voltage that causes a current to flow in a positive direction is induced in the first portion 120A, and a voltage that causes a current to flow in a negative direction is induced in the second portion 120B. As a result, the induced voltage generated in the first portion 120A and the induced voltage generated in the second portion 120B cancel each other out, and the amplitude of the second output voltage signal v2 becomes zero.

[0077] At time t4, of the first portion 120A and the second portion 120B, the first portion 120A faces the convex portion 84. In this case, a voltage that attempts to pass a current in the negative direction is induced in the second portion 120B, and the induced voltage in the first portion 120A becomes zero. As a result, the amplitude of the second output voltage signal v2 becomes a maximum value on the second polarity (negative polarity) side that is opposite to the first polarity. This maximum value becomes larger as the target member 80 approaches the second receiving coil 120.

[0078] In this embodiment, convex portions 84 and concave portions 85 are alternately formed on the target member 80. Therefore, while the wheel is rotating, the amplitude of the second output voltage signal v2 of the second receiving coil 120 changes periodically, and the envelope of the second output voltage signal v2 (hereinafter, second envelope ENV2) becomes sinusoidal, as shown by the dashed lines in Figures 23 and 24.

[0079] In this embodiment, when an excitation voltage is supplied to the excitation coil 100, the phase difference between the first output voltage signal v1 of the first receiving coil 110 and the second output voltage signal v2 of the second receiving coil 120 is 90 degrees. Therefore, as shown by the dashed line in Fig. 24, the phase difference between the envelope of the first output voltage signal v1 and the second envelope ENV2 (hereinafter, the first envelope ENV1) is also 90 degrees.

[0080] 24, the amplitude of the second envelope ENV2 is smaller than the amplitude of the first envelope ENV1. This is because, as shown in FIG. 14(a), in a plan view of the substrate 91, the area surrounded by the second receiving coil 120 is larger than the area surrounded by the first receiving coil 110.

[0081] The receiving circuit 95 outputs the deviation amount of the actual amplitude of the first envelope curve ENV1 from the amplitude of the first envelope curve ES1 in the reference state as a first displacement signal to the processing unit 70. The receiving circuit 95 also outputs the deviation amount of the actual amplitude of the second envelope curve ENV2 from the amplitude of the second envelope curve ES2 in the reference state as a second displacement signal to the processing unit 70. In this embodiment, the receiving circuit 95 is configured so that the first and second displacement signals in the reference state are 0. Each displacement signal is updated every time the maximum amplitude value on the positive polarity side and the maximum amplitude value on the negative polarity side of each output voltage signal v1, v2 appears.

[0082] A case where the lateral force acting on the wheel changes will be described.

[0083] When the direction of the lateral force faces outward in the vehicle width direction, the upper end of the target member 80 is displaced inward in the vehicle width direction, and the inner wheel 60 is tilted relative to the outer wheel 50 so that the lower end of the target member 80 is displaced outward in the vehicle width direction. In this case, the polarity of the axial displacement ΔY and each displacement signal is set to be positive as shown in FIG. 25. The larger the axial displacement ΔY in the positive direction, the larger the each displacement signal is in the positive direction. This is because, as shown in FIG. 26(a), the closer the target member 80 is to the first and second receiving coils 110 and 120, the larger the actual first and second envelopes ENV1 and ENV2 are relative to the first and second envelopes ES1 and ES2 in the reference state.

[0084] When the direction of the lateral force is toward the inside in the vehicle width direction, the lower end of the target member 80 is displaced toward the inside in the vehicle width direction, and the inner wheel 60 is tilted relative to the outer wheel 50 so that the upper end of the target member 80 is displaced toward the outside in the vehicle width direction. In this case, the polarity of the axial displacement ΔY and each displacement signal is set to negative as shown in FIG. 25. The more the axial displacement ΔY becomes in the negative direction, the more the displacement signals become in the negative direction. This is because, as shown in FIG. 26(b), the more the target member 80 is separated from the first and second receiving coils 110 and 120, the smaller the actual first and second envelopes ENV1 and ENV2 become with respect to the first and second envelopes ES1 and ES2 in the reference state. On the other hand, the first and second displacement signals in the reference state are 0.

[0085] Next, a case where the vertical load acting on the wheel changes will be described.

[0086] Fig. 27 shows the relative positional relationship between the receiving coils 110, 120 and the protruding portion 84 in the reference state. Fig. 27 shows the first and second receiving coils 110, 120 and the protruding portion 84 shown in Fig. 14 etc., with the circumferential direction being linear. In the figure, the hatched parts are the parts of the receiving coils 110, 120 that face the protruding portion 84. Fig. 28(a) shows the transition of each envelope curve in the reference state.

[0087] When the upward vertical load increases, the upper end of the target member 80 is displaced upward. In this case, the polarity of the vertical displacement ΔZ and each displacement signal is positive, as shown in FIG. 29. The more the vertical displacement ΔZ increases in the positive direction, the more the displacement signals increase in the positive direction. This is because, as shown in FIG. 27(b), the more the target member 80 is displaced upward, the more the area of ​​the portion of the second receiving coil 120 that faces the convex portion 84 increases, and as shown in FIG. 28(b), the actual second envelope ENV2 becomes smaller than the second envelope ES2 in the reference state.

[0088] On the other hand, when the downward vertical load increases, the upper end of the target member 80 is displaced downward. In this case, the polarity of the vertical displacement ΔZ and each displacement signal is set to negative as shown in FIG. 29. The more negative the vertical displacement ΔZ, the more negative the displacement signals. This is because, as shown in FIG. 27(c), the more the target member 80 is displaced downward, the smaller the area of ​​the portion of the second receiving coil 120 that faces the convex portion 84 becomes, and, as shown in FIG. 28(c), the actual second envelope ENV2 becomes larger with respect to the second envelope ES2 in the reference state.

[0089] 25, the second lateral force coefficient K2y, which is the amount of change in the second displacement signal per unit change in the axial displacement ΔY, is larger than the first lateral force coefficient K1y, which is the amount of change in the first change signal per unit change in the axial displacement ΔY. This is because, in a plan view of the substrate 91, the area surrounded by the second receiving coil 120 is larger than the area surrounded by the first receiving coil 110.

[0090] 29, the second vertical load coefficient K2z, which is the amount of change in the second displacement signal per unit change in the vertical displacement ΔZ, is larger than the first vertical load coefficient K1z, which is the amount of change in the first displacement signal per unit change in the vertical displacement ΔZ. This is because, in a plan view of the substrate 91, the area surrounded by the second receiving coil 120 is larger than the area surrounded by the first receiving coil 110.

[0091] Also, the second vertical load coefficient K2z is smaller than the second lateral force coefficient K2y, and the first vertical load coefficient K1z is smaller than the first lateral force coefficient K1y. This is because, for example, the rigidity of the wheel in the vertical direction is larger than the rigidity in the vehicle width direction. In this embodiment, the relationship is "K2y>K1y>K2z>K1z". Incidentally, the detection unit 90 may be configured so that the slope of the first vertical load coefficient K1z in FIG. 29 is 0.

[0092] From the above, the combination of the axial displacement ΔY and the vertical displacement ΔZ can be uniquely linked to the combination of the first displacement signal and the second displacement signal. Therefore, the displacement calculation unit 71 constituting the processing unit 70 calculates the axial displacement ΔY and the vertical displacement ΔZ based on the first and second displacement signals and map information or formula information in which the first and second displacement signals, the axial displacement ΔY, and the vertical displacement ΔZ are associated with each other.

[0093] The force calculation unit 72 constituting the processing unit 70 calculates the lateral force Fy based on the calculated axial displacement ΔY and map information or formula information in which the axial displacement ΔY and the lateral force Fy are correlated. The force calculation unit 72 calculates the vertical load Fz based on the calculated vertical displacement ΔZ and map information or formula information in which the vertical displacement ΔZ and the vertical load Fz are correlated.

[0094] The map information or formula information may be stored in a storage unit (e.g., a non-volatile memory) included in the processing unit 70. The force calculation unit 72 may calculate the lateral force Fy and the vertical load Fz based on the first and second displacement signals and map information or formula information in which the first and second displacement signals, the lateral force Fy, and the vertical load Fz are associated with each other. The calculation of the load based on the first and second displacement signals and map information or formula information can be similarly applied to each of the following embodiments.

[0095] The rotation speed calculation unit 73 constituting the processing unit 70 calculates the rotation angle of the wheel based on at least one of the first output voltage signal v1 and the second output voltage signal v2.

[0096] Specifically, for example, the rotation speed calculation unit 73 may calculate the rotation angle based on the first envelope curve ENV1 or the second envelope curve ENV2. This calculation method is based on the fact that the envelope curve is information indicating the transition of the amplitude of the output voltage signal and that the amplitude of the output voltage signal depends on the rotation angle.

[0097] Also, for example, the rotation speed calculation unit 73 may calculate the rotation angle by using synchronous detection and a low-pass filter with the first output voltage signal v1, the second output voltage signal v2, and the excitation voltage vr as inputs. This calculation method is a digital tracking method, and is described in, for example, paragraphs 0028 to 0030 of the specification of JP 2015-073407 A.

[0098] The rotation speed calculation unit 73 calculates the rotation speed of the wheel based on the calculated rotation angle. Specifically, for example, the rotation speed calculation unit 73 may calculate the rotation speed based on a time differential value of the rotation angle.

[0099] 31 shows the procedure of the load and rotation speed calculation process executed by the processing unit 70. This process is repeatedly executed at a predetermined control period, for example.

[0100] In step S10, the first and second displacement signals, the first and second output voltage signals v1 and v2 are obtained from the receiving circuit 95.

[0101] In step S11, an axial displacement ΔY is calculated based on the acquired first and second displacement signals, and in step S12, a vertical displacement ΔZ is calculated based on the acquired first and second displacement signals.

[0102] In step S13, the lateral force Fy is calculated based on the calculated axial displacement ΔY, and in step S14, the vertical load Fz is calculated based on the calculated vertical displacement ΔZ.

[0103] In step S15, the rotation angle of the wheel is calculated based on at least one of the first output voltage signal v1 and the second output voltage signal v2, and the rotation speed of the wheel is calculated based on the calculated rotation angle.

[0104] As described above, according to this embodiment, in a bearing module with a sensor used to calculate load and rotational speed, the space around the hub bearing 40 can be effectively used as space for arranging the target member 80 and the detection unit 90.

[0105] <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 (eg, equally divided in the circumferential direction).

[0106] <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 Fig. 32, a ring member 86 is not used to attach the target member 80 to the flange portion 62. More specifically, the outer peripheral edge portion of the flange portion 62 is pressed from the outside in the radial direction against the inner peripheral surface of the inner peripheral wall portion 82 that constitutes the target member 80. In this way, the target member 80 is fixed to the flange portion 62.

[0107] According to the present embodiment described above, the number of parts constituting the wheel unit 10 can be reduced.

[0108] <Third embodiment> The third embodiment will be described below with reference to the drawings, focusing on the differences from the first embodiment. In this embodiment, a target member 180 is fixed to the hub bearing 40 with a bolt 184, as shown in FIGS.

[0109] Similar to the first embodiment, the target member 180 is composed of a first divided member 180A and a second divided member 180B. However, in each divided member 180A, 180B, a flat surface 182 that abuts (specifically, makes surface contact with) the mounting surface 62a of the flange portion 62 is formed on the portion opposite to the surface on which the convex portion 84 and the concave portion 85 are formed.

[0110] Through holes 62b, through which the bolts 184 are inserted, are formed side by side in the circumferential direction in the flange portion 62. The through holes 62b are formed in positions shifted in the circumferential direction from the positions at which the hub bolts 17 protrude.

[0111] Each divided member 180A, 180B has a female screw hole 183 that opens from the flat surface 182 side. The female screw hole 183 does not penetrate to the surface of each divided member 180A, 180B where the convex portion 84 and the concave portion 85 are formed. With the flat surface 182 of each divided member 180A, 180B abutting against the mounting surface 62a and the bolt 184 inserted into the through hole 62b, the male screw of the bolt 184 is screwed into the female screw hole 183. In this way, each divided member 180A, 180B is fixed to the flange portion 62.

[0112] When viewed from the front of the mounting surface 62a, the side surface portion 181 of the target member 180 does not protrude from the flange portion 62. This makes it possible to suppress an increase in the radial dimension of the sensor-equipped bearing module.

[0113] According to the present embodiment described above, the space around the hub bearing 40 can also be effectively used as a space for arranging the target member 180 and the detection unit 90.

[0114] <Fourth embodiment> The fourth embodiment will be described below with reference to the drawings, focusing on the differences from the first embodiment. In this embodiment, as shown in Fig. 35, a hub bearing 240 is fixed to the disk mounting portion 18 of the wheel 11, and a disk rotor 221 is fixed to a flange portion 262 of the hub bearing 240.

[0115] In the wheel unit 200, the disc rotor 221 has a hat portion 222 and a sliding portion 223. The hat portion 222 is attached to a hub bearing 240. The front and back surfaces of the sliding portion 223 form a pair of sliding surfaces that are pressed against by disc pads that constitute a brake caliper 233.

[0116] Hub bearing 240 is a rolling bearing and includes an outer ring 250 (corresponding to the "second bearing portion"), an inner ring 260 (corresponding to the "first bearing portion"), and a number of rolling elements 241 arranged between the outer ring 250 and the inner ring 260.

[0117] The inner ring 260 includes an inner cylindrical portion 261 (corresponding to a "first cylindrical portion") extending in the axial direction, and a flange portion 262 extending radially from a first end of the inner cylindrical portion 261 in the axial direction.

[0118] The outer ring 250 has an outer cylindrical portion 251 (corresponding to a "second cylindrical portion") provided at a position facing radially outward from the inner cylindrical portion 261. The outer ring 250 has a hub attachment portion 252 that protrudes radially outward from the outer cylindrical portion 251. The hub attachment portion 252 is fixed by bolts 253 to the knuckle 215 serving as a base portion.

[0119] The flange portion 262 is disk-shaped and extends radially outward beyond the outer cylindrical portion 251. The disc mounting portion 18 is fixed to a portion of the flange portion 262 that is outer in the vehicle width direction, and the hat portion 222 of the disc rotor 221 is fixed to a portion of the flange portion 262 that is inner in the vehicle width direction.

[0120] The wheel unit 200 includes, as a detection device, an annular target member 280 and a detection unit 290, similar to the first embodiment. The target member 280 is fixed to the inner part of the flange portion 62 in the vehicle width direction, radially outward of the hat portion 222. The detection unit 290 is provided at a position facing the target member 280 in the axial direction. The detection unit 290 is fixed to a bracket 291, and the bracket 291 is fixed to the knuckle 215.

[0121] According to the present embodiment described above, the space around the hub bearing 240 can be effectively used as a space for arranging the target member 280 and the detection unit 290.

[0122] <Fifth embodiment> Hereinafter, the fifth embodiment will be described with reference to the drawings, focusing on the differences from the fourth embodiment. In this embodiment, as shown in Fig. 36, a spindle-type hub bearing is used.

[0123] The wheel unit 300 includes a brake device and a hub bearing 340 (corresponding to a "bearing member"). The brake device includes a disc rotor 321 and a brake caliper 333.

[0124] The disc rotor 321 has a hat portion 322 and a sliding portion 323. The hat portion 322 is attached to a hub bearing 340. The front and back surfaces of the sliding portion 323 form a pair of sliding surfaces that are pressed against by disc pads of a brake caliper 333.

[0125] Hub bearing 340 includes a spindle shaft 341 fixed to a base portion 315, a rotating shaft 342, a cylindrical portion 343, a flange portion 344, and a bearing 345. Note that base portion 315 is, for example, a knuckle of a vehicle or a housing mounted on a vehicle. The housing is, for example, a housing of an electric axle in which a motor, an inverter, and a transmission are integrated.

[0126] The spindle shaft 341 extends outward in the vehicle width direction from the base portion 315. A through hole penetrating in the axial direction is formed in the rotating shaft 342, and the rotating shaft 342 is inserted into the through hole. Rotational power is applied to the rotating shaft 342 from a motor or the like that serves as a power source for running the vehicle.

[0127] The cylindrical portion 343 is provided radially outward of the spindle shaft 341, and is rotatably supported by the spindle shaft 341 via a bearing 345. The bearing 345 is a rolling bearing. A flange portion 344 extends radially outward from an axial end of the cylindrical portion 343.

[0128] A target member 380 having an annular shape is fixed to a portion of the flange portion 344 on the inner side in the vehicle width direction. As described in the first embodiment, the target member 380 has protrusions and recesses arranged side by side in the circumferential direction. A detection unit 390 is provided at a position facing the target member 380 in the axial direction. The detection unit 390 is fixed to the base portion 315 via a bracket 391.

[0129] According to the present embodiment described above, it is possible to achieve the same effects as those of the fourth embodiment.

[0130] <Other embodiments> Each of the above embodiments may be modified as follows.

[0131] 37, the wheel unit 300 of the fifth embodiment may be provided with a drum brake instead of a disc brake as the braking device 320. The braking device 320 includes a brake shoe 324. The braking device 320 is provided on the radially outer side of the cylindrical portion 343.

[0132] The target member may be as shown in FIG. 38. The target member 480 is made of a metal material (e.g., aluminum or iron) and includes an annular ring portion 486 and a plurality of shielding portions 484. The shielding portions 484 protrude radially inward from the ring portion 486 and are arranged side by side in the circumferential direction. A notch portion 485 is formed between the shielding portions 484 adjacent to each other in the circumferential direction. The shielding portions 484 correspond to the convex portion 84 in the first embodiment, and the notch portion 485 corresponds to the concave portion 85 in the first embodiment. In FIG. 38, 484a is the radial inner end of the ring portion 486 and the radial outer end of the shielding portion 484, and 484b is the radial inner end of the shielding portion 484. The notch portion 485 may be filled with a non-metallic material (e.g., synthetic resin).

[0133] As shown in FIG. 39, the hub bearing 440 may have an outer ring 460 (corresponding to the "first bearing portion") that rotates with the wheel 11, and an inner ring 450 (corresponding to the "second bearing portion") that is fixed to a base portion. The outer ring 460 includes an outer cylindrical portion 461 (corresponding to the "first cylindrical portion") and a flange portion 462. The inner ring 450 includes an inner cylindrical portion 451 (corresponding to the "second cylindrical portion") and a hub attachment portion 452 that protrudes radially outward from the inner cylindrical portion 451. The hub attachment portion 452 is fixed to the base portion by a bolt (not shown).

[0134] The coil section 92 may be configured so that the phase difference between the second output voltage signal v2 of the second receiving coil 120 and the first output voltage signal v1 of the first receiving coil 110 is a predetermined phase other than 90 degrees. The predetermined phase is, for example, a phase between 30 degrees and 70 degrees.

[0135] The two receiving coils formed on the substrate 91 may be coils of the same shape (for example, the second receiving coil 120). In this case, the phases of the induced voltages in the two receiving coils will be the same.

[0136] The number of receiving coils provided on the substrate 91 is not limited to two, and may be, for example, one.

[0137] The substrate 91 may be provided at a position where the circumferential central axis Lt of the first and second receiving coils 110, 120 faces the lower end of the detection rotating part 81 in the axial direction, rather than at a position where the circumferential central axis Lt of the first and second receiving coils 110, 120 faces the lower end of the detection rotating part 81 in the axial direction.

[0138] The substrate 91 may be provided at a position where the circumferential central axis Lt of the first and second receiving coils 110, 120 faces the right end or the left end of the detection rotating part 81 in the axial direction, instead of the upper end of the detection rotating part 81 in the axial direction. In this case, the detection unit 90 can calculate the force acting between the ground contact surface GL and the wheel in the vehicle length direction of the vehicle (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.

[0139] The longitudinal load Fx is positive when the vehicle accelerates, and negative when the vehicle decelerates. When the longitudinal load Fx is positive, the convex portion 84 is displaced toward the vehicle travel direction. This state corresponds to the state in the first embodiment where the upward vertical load acting on the wheel increases. On the other hand, when the longitudinal load Fx is negative, the convex portion 84 is displaced toward the opposite side to the vehicle travel direction. This state corresponds to the state in the first embodiment where the downward vertical load acting on the wheel increases.

[0140] As in the first embodiment, the receiving circuit 95 outputs the deviation amount of the actual amplitude of the first envelope curve ENV1 from the amplitude of the first envelope curve ES1 in the reference state as a first displacement signal to the processing unit 70. In addition, the receiving circuit 95 outputs the deviation amount of the actual amplitude of the second envelope curve ENV2 from the amplitude of the second envelope curve ES2 in the reference state as a second displacement signal to the processing unit 70.

[0141] The displacement calculation unit 71 calculates the axial displacement ΔY and the vehicle length direction displacement ΔX based on the first and second displacement signals and map information or formula information in which the first and second displacement signals, the axial displacement ΔY, and the vehicle length direction displacement ΔX are correlated.

[0142] The force calculation unit 72 calculates the lateral force Fy based on the calculated axial displacement ΔY and map information or formula information in which the axial displacement ΔY and the lateral force Fy are correlated. The force calculation unit 72 calculates the longitudinal load Fx based on the calculated vehicle lengthwise displacement ΔX and map information or formula information in which the vehicle lengthwise displacement ΔX and the longitudinal load Fx are correlated.

[0143] The processing unit 70 may execute only either the load calculation process or the rotation speed calculation process.

[0144] The rotor of the motor that serves as the driving power source for the vehicle may be arranged to rotate integrally with the hub bearing or to rotate via a transmission. The rotor has field poles (e.g., permanent magnets or electromagnets with field windings). In this case, the processing unit 70 may calculate the rotation angle of the rotor (specifically, the electrical angle or mechanical angle). For example, the amplitude or envelope can be associated with the electrical angle θe by setting the circumferential interval between the magnetic pole positions of the rotor in relation to the circumferential lengths of the protrusions 84 and recesses 85. The calculated rotation angle is used, for example, to control the motor.

[0145] In each of the above embodiments, the target member may be fixed to the base portion such as a knuckle rather than to the wheel 11, and the detection unit may be fixed to the wheel 11 rather than to the base portion.

[0146] The disk rotor is not limited to a ventilated disk, but may be, for example, a solid disk made of a single circular plate.

[0147] The mechanical device to which the detection device can be applied is not limited to a wheel unit, but may 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.

[0148] Furthermore, the rotating body is not limited to being used with the axial direction of the rotating body being horizontal, but may be used with the axial direction being in a direction other than horizontal (for example, up and down).

[0149] The control device and the method described in the present disclosure may be realized by a special-purpose computer provided by configuring a processor and a memory programmed to execute one or more functions embodied in a computer program. Alternatively, the control device and the method described in the present disclosure may be realized by a special-purpose computer provided by configuring a processor with one or more dedicated hardware logic circuits. Alternatively, the control device and the method described in the present disclosure may be realized by one or more special-purpose computers configured by a combination of a processor and a memory programmed to execute one or more functions and a processor configured with one or more hardware logic circuits. In addition, the computer program may be stored in a computer-readable non-transitory tangible recording medium as instructions executed by the computer.

[0150] Characteristic configurations extracted from each of the above-described embodiments will be described below. [Configuration 1] A detection device applied to a mechanical device (10, 200, 300), The mechanical device comprises: Rotating bodies (11, 14, 21, 221, 321) and a bearing member (40, 240, 340, 440) that rotatably supports the rotor with respect to a base portion (15, 215, 315); Equipped with the bearing member has a cylindrical portion (61, 461) extending in an axial direction of the bearing member, and a flange portion (62, 262, 344, 462) extending in a radial direction of the bearing member from a first end of the cylindrical portion in the axial direction and to which the rotating body is fixed, and supports the cylindrical portion and the flange portion rotatably with respect to the base portion; The flange portion extends radially outward beyond the cylindrical portion, a target member (80, 180, 280, 380) provided in an arrangement space that is adjacent to the flange portion on the second end side of the cylindrical portion in the axial direction and is an outer space than the cylindrical portion in the radial direction; a displacement detection unit (90, 290, 390) provided in the arrangement space at a position facing the target member in the axial direction; Equipped with the target member has an annular shape extending in a circumferential direction of the bearing member about a rotation center of the bearing member, one of the target member and the displacement detection unit is fixed to the flange portion, and the other is fixed to the base portion; The displacement detection unit outputs a voltage signal corresponding to a relative displacement of the target member with respect to the displacement detection unit. [Configuration 2] the cylindrical portion is a first cylindrical portion, The bearing member is a first bearing portion (60, 460) having the first cylindrical portion and the flange portion (62, 462); a second bearing portion (50, 450) having a second cylindrical portion (51, 451) provided at a position radially opposed to the first cylindrical portion and fixed to the base portion; a rolling element (41, 441) provided between the first bearing portion and the second bearing portion; the first bearing portion is rotatably supported relative to the base portion, 2. The detection device according to claim 1, wherein the flange portion extends radially outward beyond the first cylindrical portion and the second cylindrical portion. [Configuration 3] the displacement detection unit is fixed to the base unit, the target member (80, 180, 280) is provided on the flange portion side relative to the displacement detection portion (90, 290) in the axial direction, The flange portion is disk-shaped, the target member is provided at a position facing the displacement detection portion in the axial direction and has an annular detection rotating portion (81) extending in the circumferential direction around a rotation center of the first bearing portion, 3. The detection device according to configuration 2, wherein the displacement detection section outputs a voltage signal corresponding to a relative displacement of the detection rotor with respect to the displacement detection section. [Configuration 4] the target member has an inner peripheral wall portion (82) extending from an outer peripheral edge portion of the detection rotating portion toward the flange portion in the axial direction, the inner peripheral wall portion abuts against an outer peripheral edge portion of the flange portion from the outside in the radial direction, a mounting surface (62a) on which the rotating body is mounted is formed as a flat surface extending in the radial direction on a portion of the flange portion opposite to the displacement detection portion in the axial direction, a disk portion (87) having a flat surface (87b) that contacts the mounting surface; an outer peripheral wall portion (88) that abuts against the inner peripheral wall portion from the outside in the radial direction and extends from an outer peripheral edge portion of the disk portion toward the displacement detection portion in the axial direction; A fixing member (86) having The detection device according to configuration 3, wherein an outer peripheral surface of the inner peripheral wall portion is pressed against an inner peripheral surface of the outer peripheral wall portion to fix the target member to the flange portion. [Configuration 5] an outer circumferential edge portion of the disk portion extends radially outward beyond a tip end portion of the inner circumferential wall portion, A tip end of the inner peripheral wall portion abuts against the disk portion, The detection device according to configuration 4, wherein a step portion (88a) is formed at a base end of the outer peripheral wall portion, the step portion protruding radially inward and for press-fitting and fixing a tip end of the inner peripheral wall portion. [Configuration 6] The detection device according to configuration 4 or 5, wherein the outer peripheral wall portion extends in the axial direction to a position covering the displacement detection portion from the outside in the radial direction. [Configuration 7] 7. The detection device according to any one of configurations 4 to 6, wherein the inner peripheral wall portion and the outer peripheral wall portion are made of the same material. [Configuration 8] The target member (180) abuts against a portion of the flange portion that faces the displacement detection portion in the axial direction, The flange portion has a through hole (62b) through which a bolt (184) is inserted and which penetrates in the axial direction. A female screw hole (183) into which the bolt is screwed is formed on the flange portion side of the target member in the axial direction, The detection device according to configuration 3, wherein with the target member abutting against the flange portion and the bolt inserted into the through hole, the bolt is screwed into the female threaded hole to fix the target member to the flange portion. [Configuration 9] the target member has an inner peripheral wall portion (82) extending from an outer peripheral edge portion of the detection rotating portion toward the flange portion in the axial direction, The detection device according to configuration 3, wherein an outer peripheral edge portion of the flange portion is pressed against an inner peripheral surface of the inner peripheral wall portion to fix the target member to the flange portion. [Configuration 10] 10. The detection device according to any one of configurations 1 to 9, wherein the target member (80A, 80B, 180A, 180B) is divided into a plurality of parts in the circumferential direction. [Configuration 11] The mechanical device is a wheel unit (10) having wheels (11, 14) of a vehicle, As the rotating body, a disk peripheral wall portion (25) extending from the flange portion toward the displacement detection portion in the axial direction; a ring-shaped sliding portion (23) extending in the radial direction from an end portion in the axial direction of the disk peripheral wall portion; A disk rotor (21) having 11. The detection device according to any one of configurations 1 to 10, wherein the target member (80, 180) is provided in the arrangement space, radially inwardly of the disk peripheral wall portion. [Configuration 12] An air passage is formed in the sliding portion, the air passage extending from an air intake port (31) formed on the inside in the radial direction to an air exhaust port (32) formed on the outside in the radial direction, 12. The detection device according to claim 11, wherein the target member is provided at a position opposite the air intake in the radial direction. [Configuration 13] The mechanical device includes a brake caliper (33), 13. The detection device according to claim 11, wherein the displacement detection unit is provided at a position that overlaps with an installation position of the brake caliper in the axial direction and is spaced apart from the brake caliper in the circumferential direction. [Configuration 14] the mechanical device includes a heat shield (35) provided on the inner side of the bearing member and the disk rotor in the vehicle width direction, the heat shield extends in the radial direction to a position facing the displacement detection unit in the axial direction, The detection device according to any one of configurations 11 to 13, wherein an insertion hole (35a) is formed in a portion of the heat shield that faces the displacement detection unit in the axial direction, through which wiring (97) extending from the displacement detection unit is inserted. [Configuration 15] the displacement detection unit is fixed to the base unit, 2. The detection device according to claim 1, wherein the target member (280, 380) is provided on a portion of the flange portion (262, 344) that faces the displacement detection portion (290, 390) in the axial direction. [Configuration 16] The detection rotating portion is a configuration in which recesses (85) recessed in the axial direction and protrusions (84) protruding in the axial direction relative to the recesses are alternately provided in the circumferential direction; or A configuration in which metal portions (484) and portions (485) that are pierced in the axial direction are alternately provided in the circumferential direction. 16. The detection device according to any one of configurations 1 to 15, [Configuration 17] The displacement detection unit two planar receiving coils (110, 120) fixed to the base portion and provided at positions facing the upper end or the lower end of the detection rotor in the axial direction and extending in a direction intersecting the axial direction; An excitation coil (100) to which an AC excitation voltage is supplied; having A voltage is induced in each of the receiving coils when the excitation voltage is supplied to the excitation coil, In a plan view of the receiving coils, an outer end portion in the radial direction of one of the receiving coils (120) protrudes from an outer end (84a) in the radial direction of the detection rotor, The radial positions of the outer ends of the receiving coils in the radial direction are different from each other, 17. The detection device according to any one of configurations 1 to 16, wherein each of the receiving coils outputs a voltage signal corresponding to a displacement in the axial direction and a displacement in a direction perpendicular to the axial direction. [Configuration 18] 18. The detection device according to claim 17, further comprising a force calculation unit (72) that calculates a force acting on the rotating body based on an output voltage signal of each of the receiving coils. [Configuration 19] A detection device according to any one of configurations 1 to 18, The bearing member; A module comprising: [Explanation of symbols]

[0151] 10...wheel unit, 40...hub bearing, 80...target member, 90...detection unit.

Claims

1. A detection device applied to a mechanical device (300), The mechanical device is A rotating body (11), a bearing member (340) that rotatably supports the rotating body relative to a base portion (315); Equipped with The bearing member is a spindle shaft (341) fixed to the base portion and extending in the axial direction of the bearing member; a cylindrical portion (343) provided on the outer side of the spindle shaft in the radial direction of the bearing member and extending in the axial direction; a flange portion (344) extending in the radial direction from a first end of the cylindrical portion in the axial direction and to which the rotating body is fixed; a bearing (345) provided between the spindle shaft and the cylindrical portion in the radial direction and supporting the cylindrical portion and the flange portion rotatably with respect to the spindle shaft; and the flange portion extends radially outward beyond the cylindrical portion, a target member (380) provided in an arrangement space that is adjacent to the flange portion on the second end side of the cylindrical portion in the axial direction and is an outer space than the cylindrical portion in the radial direction; a displacement detection unit (390) provided in the arrangement space at a position facing the target member in the axial direction; Equipped with the target member has an annular shape extending in a circumferential direction of the bearing member around the rotation center of the bearing member, one of the target member and the displacement detection unit is fixed to the flange portion, and the other is fixed to the base portion; The displacement detection unit outputs a voltage signal corresponding to a relative displacement of the target member with respect to the displacement detection unit.

2. The mechanical device comprises a brake device having a disc rotor (321), The disk rotor has an annular sliding portion (323) and rotates integrally with the rotating body, the cylindrical portion, and the flange portion. The detection device according to claim 1 , wherein the sliding portion is provided at a position spaced apart from the target member and the displacement detection portion on a side opposite to the flange portion in the axial direction.

3. A detection device applied to a mechanical device (10, 200), The mechanical device is A rotating body (11, 14, 21, 221), a bearing member (40, 240, 440) that rotatably supports the rotating body relative to a base portion (15, 215); Equipped with The bearing member is a first bearing portion (60, 460) including a first cylindrical portion (61, 461) extending in an axial direction of the bearing member, and a flange portion (62, 262, 462) extending in a radial direction of the bearing member from a first end of the first cylindrical portion in the axial direction and to which the rotating body is fixed; a second bearing portion (50, 450) having a second cylindrical portion (51, 451) provided at a position facing the first cylindrical portion in the radial direction and fixed to the base portion; a rolling element (41, 441) provided between the first bearing portion and the second bearing portion; the first bearing portion is rotatably supported relative to the base portion, the flange portion extends radially outward beyond the first cylindrical portion and the second cylindrical portion, a target member (80, 180, 280) provided in an arrangement space that is adjacent to the flange portion on the second end side of the first cylindrical portion in the axial direction and is an outer space than the first cylindrical portion and the second cylindrical portion in the radial direction; a displacement detection unit (90, 290) provided in the arrangement space at a position facing the target member in the axial direction; Equipped with the target member has an annular shape extending in a circumferential direction of the bearing member around the rotation center of the bearing member, one of the target member and the displacement detection unit is fixed to the flange portion, and the other is fixed to the base portion; The displacement detection unit outputs a voltage signal corresponding to a relative displacement of the target member with respect to the displacement detection unit.

4. The rotating body is provided with a disk rotor (21) having an annular sliding portion (23), The detection device according to claim 3 , wherein the target member (80, 180) is provided in the arrangement space on the inner side of the sliding portion in the radial direction.

5. the displacement detection unit is fixed to the base unit, the target member (80, 180, 280) is provided closer to the flange portion than the displacement detection portion (90, 290) in the axial direction, The flange portion has a disk shape, the target member is provided at a position facing the displacement detection portion in the axial direction and has an annular detection rotating portion (81) that extends in the circumferential direction around a rotation center of the first bearing portion, The detection device according to claim 3 , wherein the displacement detection section outputs a voltage signal corresponding to a relative displacement of the detection rotor with respect to the displacement detection section.

6. The target member (80) has an inner peripheral wall portion (82) extending from an outer peripheral edge portion of the detection rotating portion toward the flange portion in the axial direction, the inner peripheral wall portion abuts against an outer peripheral edge portion of the flange portion from the outside in the radial direction, a mounting surface (62 a) on which the rotating body is mounted is formed as a flat surface extending in the radial direction on a portion of the flange portion opposite to the displacement detection portion (90) in the axial direction; a disk portion (87) having a flat surface (87b) that contacts the mounting surface; an outer peripheral wall portion (88) that abuts against the inner peripheral wall portion from the outside in the radial direction and extends from an outer peripheral edge portion of the disk portion toward the displacement detection portion in the axial direction; a fixing member (86) having The detection device according to claim 5 , wherein the outer peripheral surface of the inner peripheral wall portion is pressed against the inner peripheral surface of the outer peripheral wall portion to fix the target member to the flange portion.

7. an outer peripheral edge portion of the disk portion extends radially outward beyond a tip end portion of the inner peripheral wall portion, a tip end of the inner peripheral wall portion abutting against the disk portion, 7. The detection device according to claim 6, wherein a stepped portion (88a) is formed at a base end of the outer peripheral wall portion, the stepped portion protruding radially inward and adapted to press-fit and fix a tip end of the inner peripheral wall portion.

8. The detection device according to claim 6 or 7, wherein the outer peripheral wall portion extends in the axial direction to a position where it covers the displacement detection portion from outside in the radial direction.

9. 8. The detection device according to claim 6, wherein the inner peripheral wall portion and the outer peripheral wall portion are made of the same material.

10. The target member (180) abuts on a portion of the flange portion that faces the displacement detection portion in the axial direction, The flange portion has a through-hole (62b) formed therein, through which a bolt (184) is inserted and which penetrates in the axial direction. A female screw hole (183) into which the bolt is screwed is formed on the flange portion side of the target member in the axial direction, 6. The detection device according to claim 5, wherein the target member is fixed to the flange portion by screwing the bolt into the female threaded hole with the target member abutting the flange portion and the bolt inserted into the through hole.

11. the target member has an inner peripheral wall portion (82) extending from an outer peripheral edge portion of the detection rotating portion toward the flange portion in the axial direction, The detection device according to claim 5 , wherein the outer peripheral edge of the flange portion is pressed against the inner peripheral surface of the inner peripheral wall portion to fix the target member to the flange portion.

12. A detection device applied to a mechanical device (10, 200, 300), The mechanical device is A rotating body (11, 14, 21, 221, 321), a bearing member (40, 240, 340, 440) that rotatably supports the rotating body relative to a base portion (15, 215, 315); Equipped with the bearing member has a cylindrical portion (61, 461) extending in an axial direction of the bearing member, and a flange portion (62, 262, 344, 462) extending in a radial direction of the bearing member from a first end of the cylindrical portion in the axial direction and to which the rotating body is fixed, and the cylindrical portion and the flange portion are rotatably supported with respect to the base portion; the flange portion extends radially outward beyond the cylindrical portion, a target member (80A, 80B, 180A, 180B) provided in an arrangement space that is adjacent to the flange portion on the second end side of the cylindrical portion in the axial direction and is an outer space than the cylindrical portion in the radial direction; a displacement detection unit (90, 290, 390) provided in the arrangement space at a position facing the target member in the axial direction; Equipped with the target member has an annular shape extending in a circumferential direction of the bearing member around the rotation center of the bearing member, one of the target member and the displacement detection unit is fixed to the flange portion, and the other is fixed to the base portion; the displacement detection unit outputs a voltage signal corresponding to a relative displacement of the target member with respect to the displacement detection unit; The target member is divided into a plurality of parts in the circumferential direction.

13. A detection device applied to a wheel unit (10) having wheels (11, 14) of a vehicle, The wheel unit includes: A rotating body (21), a bearing member (40, 440) that rotatably supports the rotating body relative to a base portion (15); Equipped with the bearing member has a cylindrical portion (61, 461) extending in the axial direction of the bearing member, and a flange portion (62, 462) extending in the radial direction of the bearing member from a first end of the cylindrical portion in the axial direction and to which the rotating body is fixed, and the cylindrical portion and the flange portion are rotatably supported with respect to the base portion; the flange portion extends radially outward beyond the cylindrical portion, a target member (80, 180) provided in an arrangement space that is adjacent to the flange portion on the second end side of the cylindrical portion in the axial direction and is an outer space than the cylindrical portion in the radial direction; a displacement detection unit (90) provided in the arrangement space at a position facing the target member in the axial direction; Equipped with the target member has an annular shape extending in a circumferential direction of the bearing member around the rotation center of the bearing member, one of the target member and the displacement detection unit is fixed to the flange portion, and the other is fixed to the base portion; the displacement detection unit outputs a voltage signal corresponding to a relative displacement of the target member with respect to the displacement detection unit; The rotating body may be: a disk peripheral wall portion (25) extending from the flange portion toward the displacement detection portion in the axial direction; an annular sliding portion (23) extending in the radial direction from the axial end of the disk peripheral wall portion; A disk rotor (21) having The detection device, wherein the target member is provided in the arrangement space radially inward of the disk peripheral wall portion.

14. An air passage is formed in the sliding portion, the air passage extending from an air intake port (31) formed on the inside in the radial direction to an air discharge port (32) formed on the outside in the radial direction, The detection device according to claim 13 , wherein the target member is provided at a position opposite the air intake in the radial direction.

15. The wheel unit comprises a brake caliper (33), The detection device according to claim 13 , wherein the displacement detection portion is provided at a position that overlaps with an installation position of the brake caliper in the axial direction and at a position that is spaced apart from the brake caliper in the circumferential direction.

16. The wheel unit includes a heat shield plate (35) provided on the inner side of the bearing member and the disc rotor in the vehicle width direction, the heat shield extends in the radial direction to a position facing the displacement detection unit in the axial direction, The detection device according to claim 13, wherein an insertion hole (35a) is formed in a portion of the heat shield that faces the displacement detection unit in the axial direction, through which wiring (97) extending from the displacement detection unit is inserted.

17. the displacement detection unit is fixed to the base unit, The detection device according to any one of claims 1, 2 to 7, and 10 to 16, wherein the target member (280, 380) is provided in a portion of the flange portion (262, 344) that faces the displacement detection portion (290, 390) in the axial direction.

18. The detection rotor is A configuration in which recesses (85) recessed in the axial direction and protrusions (84) protruding in the axial direction relative to the recesses are alternately provided in the circumferential direction, or A configuration in which metal portions (484) and portions (485) that are pierced in the axial direction are alternately provided in the circumferential direction. The detection device according to any one of claims 5 to 7 and 9 to 11, wherein:

19. A detection device applied to a mechanical device (10, 200, 300), The mechanical device is A rotating body (11, 14, 21, 221, 321), a bearing member (40, 240, 340, 440) that rotatably supports the rotating body relative to a base portion (15, 215, 315); Equipped with the bearing member has a cylindrical portion (61, 461) extending in an axial direction of the bearing member, and a flange portion (62, 262, 344, 462) extending in a radial direction of the bearing member from a first end of the cylindrical portion in the axial direction and to which the rotating body is fixed, and the cylindrical portion and the flange portion are rotatably supported with respect to the base portion; the flange portion extends radially outward beyond the cylindrical portion, a target member (80, 180, 280, 380) provided in an arrangement space that is adjacent to the flange portion on the second end side of the cylindrical portion in the axial direction and is an outer space than the cylindrical portion in the radial direction; a displacement detection unit (90, 290, 390) provided in the arrangement space at a position facing the target member in the axial direction; Equipped with the target member has an annular shape extending in a circumferential direction of the bearing member around the rotation center of the bearing member, the target member is provided at a position facing the displacement detection unit in the axial direction and has an annular detection rotating unit (81) that extends in the circumferential direction around the rotation center, the target member is fixed to the flange portion, and the displacement detection unit is fixed to the base portion; The displacement detection unit two planar receiving coils (110, 120) fixed to the base portion and provided at positions facing the upper end or lower end of the detection rotor in the axial direction, and extending in a direction intersecting the axial direction; an excitation coil (100) to which an AC excitation voltage is supplied; and a voltage is induced in each of the receiving coils when the excitation voltage is supplied to the excitation coil; In a plan view of the receiving coils, an outer end portion of one of the receiving coils (120) in the radial direction protrudes from an outer end (84 a) of the detection rotor in the radial direction, the radial positions of the outer ends of the receiving coils in the radial direction are different, The detection device wherein each of the receiving coils outputs a voltage signal corresponding to a displacement in the axial direction and a displacement in a direction perpendicular to the axial direction relative to the detection rotor.

20. The detection device according to claim 19, further comprising a force calculation unit (72) that calculates a force acting on the rotating body based on an output voltage signal of each of the receiving coils.

21. A detection device according to any one of claims 1 to 7, 10 to 16, and 19; The bearing member; A module comprising:

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