Sensor-equipped cable and rotation detection device

Abstract

To provide a sensor-equipped cable capable of suppressing deformation of a sealing body when manufacturing the sensor-equipped cable including the sealing body made of resin that seals a sensor element and ends of the cable, and a rotation detection device including the sensor-equipped cable.SOLUTION: A sensor-equipped cable 2 comprises a sensor element 3 for detecting a magnetic field of a magnetic encoder 96, a cable 22 having a plurality of electric wires 221 and 222 connected to the sensor element 3, and a sealing body 7 made of resin that seals the sensor element 3 and ends of the cable 22. The sealing body 7 includes a sensor element housing part 74 housing the sensor element 3 and having a facing plane 74a facing the magnetic encoder 96, and a rib part 75 provided continuously to the facing plane 74a so as to protrude from the sensor element housing part 74 to the magnetic encoder 96.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a cable with a sensor and a rotation detection device. [Background technology]

[0002] Conventionally, for example, in a wheel bearing device that rotatably supports a wheel of a vehicle, a cable with a sensor is used that detects the rotation of an inner ring relative to an outer ring fixed to a knuckle of a suspension device and transmits the detection result to a control device. The applicant has proposed such a cable with a sensor as described in Patent Documents 1 and 2.

[0003] The sensor-equipped cables of Patent Documents 1 and 2 include a cable and a sensor unit provided at the end of the cable. The sensor unit includes a magnetic sensor such as a Hall element, a capacitor for reducing noise, a resin holder for holding the magnetic sensor and capacitor (see Figure 2 of Patent Document 2), and a housing made of a resin mold that covers the magnetic sensor, capacitor, and holder. The housing functions as a sealing body that liquid-tightly seals the magnetic sensor and capacitor together with the end of the cable. As shown in Figure 1 of Patent Document 1, a portion of the sensor unit is housed in a retaining hole formed in the knuckle, and the magnetic sensor is located at its tip that protrudes from the retaining hole toward the inner ring. The magnetic sensor detects the magnetic field of a magnetic encoder fixed to the inner ring. The magnetic encoder is positioned opposite the sensor unit and has north and south magnetic poles arranged alternately along the circumferential direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-227560 [Patent Document 2] Japanese Patent Application Publication No. 2019-211226 Summary of the Invention [Problem to be solved by the invention]

[0005] When manufacturing the sensor-equipped cable configured as described above, the housing is molded by injecting molten resin into a mold cavity in which the magnetic sensor and the cable end are located. After the molten resin cools and solidifies, the molded housing is removed from the mold. Because the molten resin solidifies while shrinking, the molded housing may deform from its intended shape depending on conditions such as the temperature distribution depending on the volume of the molten resin. If the housing deforms, the distance between the magnetic encoder and the magnetic sensor changes, which may alter the sensitivity of the magnetic sensor to the magnetic fields of the north and south magnetic poles.

[0006] Therefore, the present invention aims to provide a sensor-equipped cable that is capable of suppressing deformation of a sealing body made of resin that seals the sensor element and the end of the cable during manufacturing, and a rotation detection device that is equipped with such a sensor-equipped cable. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the present invention provides a sensor-equipped cable comprising: a sensor element that detects the physical quantity of an object to be detected; a cable having a plurality of electric wires connected to the sensor element; and a sealing body made of resin that seals the sensor element and the end of the cable, wherein the sealing body has a sensor element accommodating section that accommodates the sensor element and has an opposing flat surface that faces the object to be detected; and a rib section that is continuous with the opposing flat surface and protrudes from the sensor element accommodating section toward the object to be detected.

[0008] Furthermore, for the purpose of solving the above-mentioned problems, the present invention provides a rotation detection device comprising a sensor-equipped cable having a sensor unit and an attachment member to which the sensor unit is attached, and detecting the rotation of a rotating member relative to the attachment member, wherein the sensor-equipped cable comprises a sensor element that detects the physical quantity of the rotating member, a cable having a plurality of electric wires connected to the sensor element, and a sealing body made of resin that seals the sensor element and the end of the cable, and the sealing body has a sensor element accommodating section that accommodates the sensor element and has an opposing flat surface facing the rotating member, and a rib section that is continuous with the opposing flat surface and protrudes from the sensor element accommodating section toward the rotating member. [Effects of the Invention]

[0009] According to the sensor-equipped cable and rotation detector of the present invention, it is possible to suppress deformation of the sealing body, and the detection accuracy of the physical quantity of the detection target by the sensor element is improved. [Brief explanation of the drawings]

[0010] [Figure 1] 1A is a cross-sectional view showing an example of a configuration in which a rotation detection device equipped with a sensor-equipped cable according to an embodiment of the present invention is used in a vehicle wheel bearing device, FIG. 1B is an enlarged view of part A in FIG. 1A, and FIG. 1C is a plan view of a magnetic encoder that is the detection target of the rotation detection device and the sensor-equipped cable. [Figure 2] 1A is a perspective view of the external appearance of a sensor-equipped cable, and FIG. 1B is an explanatory view showing the internal configuration of the sensor-equipped cable as seen from the direction shown in FIG. [Figure 3] 1A is a perspective view of the external appearance of a sensor-equipped cable, and FIG. 1B is an explanatory view showing the internal configuration of the sensor-equipped cable as seen from the direction shown in FIG. [Figure 4] 1(a) to 1(c) are diagrams showing the configuration of the sensor-equipped cable as viewed from different directions. [Figure 5] 3 is a perspective cross-sectional view of a part of the sensor unit taken along a cross section perpendicular to the axial direction. FIG. [Figure 6] 6 is a cross-sectional view of a sensor portion of the sensor-equipped cable when the cross section shown in FIG. 5 is viewed from the axial direction. [Figure 7] FIG. 3 is a cross-sectional view of the sensor section taken along the axial direction. DETAILED DESCRIPTION OF THE INVENTION

[0011] [Embodiment Mode]

[0012] Fig. 1(a) is a cross-sectional view showing an example of a configuration in which a rotation detection device 1 equipped with a sensor-equipped cable 2 according to this embodiment is used in a vehicle wheel bearing device 9. Fig. 1(b) is an enlarged view of part A in Fig. 1(a). Fig. 1(c) is a plan view of a magnetic encoder 96 that is the detection target of the rotation detection device 1 and the sensor-equipped cable 2.

[0013] The wheel bearing device 9 has an inner ring 91 having a cylindrical body portion 911 integral with a flange portion 912 to which a wheel is attached, an outer ring 92 arranged on the outer peripheral side of the body portion 911 of the inner ring 91, and a plurality of rolling elements 93 arranged in double rows between the body portion 911 of the inner ring 91 and the outer ring 92. The inner ring 91 is a rotating element that rotates integrally with the wheel. A fitting hole 910 is formed in the center of the body portion 911 of the inner ring 91 along its rotation axis O, and into which a drive shaft (not shown) is spline-fitted. The body portion 911 of the inner ring 91 is formed with inner raceway surfaces 911a and 911b on which the rolling elements 93 roll.

[0014] The outer ring 92 is fixed to a knuckle 11 that constitutes a suspension system by a plurality of bolts 94. FIG. 1(a) shows one of these bolts 94. A retaining hole 110 that holds the outer ring 92 is formed in the knuckle 11, and a portion of the outer ring 92 is housed in the retaining hole 110. The outer ring 92 is formed with outer raceway surfaces 92a, 92b on which the rolling elements 93 roll. The knuckle 11 is an example of an attachment target member to which the sensor-equipped cable 2 is attached in this embodiment. Note that the sensor-equipped cable 2 may be attached to the outer ring 92 instead of the knuckle 11. In this case, the outer ring 92 corresponds to the attachment target member of the present invention.

[0015] The knuckle 11 is formed with a through hole 111 and a screw hole 112 for attaching the sensor-equipped cable 2. The through hole 111 passes through the knuckle 11 in a direction perpendicular to the rotation axis O and opens to an inner circumferential surface 110a of the retaining hole 110. A portion of the inner circumferential surface 110a of the retaining hole 110 faces the body portion 911 of the inner ring 91. Hereinafter, the outside of the through hole 111 will be referred to as one side of the through hole 111, and the opposite side, the inner ring 91 side, will be referred to as the other side of the through hole 111. The rotation detection device 1 is made up of the sensor-equipped cable 2 and the knuckle 11 to which the sensor-equipped cable 2 is attached.

[0016] An annular magnetic encoder 96 is attached to the body portion 911 of the inner ring 91 via an attachment member 95. The attachment member 95 has a cylindrical portion 951 fixed to the outer peripheral surface 911c of the body portion 911, and a disk portion 952 to which the magnetic encoder 96 is fixed. FIG. 1(c) shows the surface of the magnetic encoder 96 opposite the attachment member 95 (the surface facing the sensor unit 21, which will be described later). The magnetic encoder 96 has multiple N magnetic poles 961 and multiple S magnetic poles 962 arranged alternately along the circumferential direction. When the vehicle is traveling, the inner ring 91 rotates together with the magnetic encoder 96 relative to the knuckle 11 and the outer ring 92, around the rotation axis O. The magnetic encoder 96 is a rotating member whose rotation relative to the knuckle 11 is detected by the rotation detection device 1.

[0017] The sensor-equipped cable 2 has a sensor unit 21 attached to the knuckle 11 with a bolt 97, and a cable 22 extending from the sensor unit 21. A portion of the sensor unit 21 protrudes from a through-hole 111 toward the inner ring 91. FIG. 1 shows a central axis C of the sensor unit 21. The central axis C is perpendicular to the rotation axis O and coincides with the center line of the through-hole 111 of the knuckle 11. Hereinafter, the direction parallel to the central axis C will be referred to as the axial direction. Next, the configuration of the sensor-equipped cable 2 will be described in detail with reference to FIGS. 2 to 7.

[0018] FIG. 2(a) is an external perspective view of the sensor-equipped cable 2. FIG. 2(b) is an explanatory diagram showing the internal configuration of the sensor-equipped cable 2. FIG. 3(a) is an external perspective view of the sensor-equipped cable 2 as viewed from the opposite direction to FIG. 2(a). FIG. 3(b) is an explanatory diagram showing the internal configuration of the sensor-equipped cable 2. FIGS. 4(a) to 4(c) are structural diagrams of the sensor-equipped cable 2 as viewed from different directions. FIG. 5 is a perspective cross-sectional view of the sensor unit 21, where a part of the sensor unit 21 is cut along a cross section perpendicular to the axial direction. FIG. 6 is a cross-sectional view of the sensor unit 21, where the cross section shown in FIG. 5 is viewed from the axial direction. FIG. 7 is a cross-sectional view of the sensor unit 21 along the axial direction.

[0019] The sensor unit 21 includes a sensor element 3 that detects the physical quantity of the detection target, a capacitor 4 as a capacitance element for reducing noise, a pair of lead wires 51, 52 to which the sensor element 3 and the capacitor 4 are connected, a resin holder 6 that holds the sensor element 3 and the capacitor 4 together with the pair of lead wires 51, 52, a sealing body 7 that is a molded body, and a metal collar 8 embedded in the sealing body 7. The sensor unit 21 is fixed to the knuckle 11 by threading a bolt 97 inserted through the collar 8 into a threaded hole 112 in the knuckle 11.

[0020] In this embodiment, the sensor element 3 is a magnetic field detection element that detects the direction and strength of a magnetic field as a physical quantity. The rotation speed of the magnetic encoder 96 can be detected based on the direction and strength of the magnetic field detected by this sensor element 3. The sensor element 3 is a GMR (Giant Magneto Resistive effect) element, an AMR (Anisotropic Magneto Resistive) element, or a TMR (Tunneling Magneto Resistive) element, which have higher magnetic field detection sensitivity than a general Hall element. The rotation detection device 1 detects the rotation of the magnetic encoder 96 relative to the knuckle 11 using the sensor element 3.

[0021] The cable 22 includes a plurality of electric wires 221, 222 electrically connected to the sensor element 3 via a pair of lead wires 51, 52, and a sheath 223 collectively covering the plurality of electric wires 221, 222. The sheath 223 is tightly bound to the sealing body 7, thereby preventing moisture from penetrating from the outer periphery of the sheath 223 into the sealing body 7. The electric wires 221, 222 are insulated wires in which central conductors 221a, 222a made of stranded conductors formed by twisting together highly conductive wires such as copper are covered with insulators 221b, 222b made of insulating resin such as cross-linked polyethylene. The sheath 223 may be welded to the sealing body 7.

[0022] The sealing body 7 is made of molded resin that seals the sensor element 3, capacitor 4, pair of lead wires 51, 52, and holder 6 together with the end of the cable 22. When molding the sealing body 7, the assembly 20, in which the center conductors 221a, 222a of the electric wires 221, 222 are connected, for example, by soldering, to the lead wires 51, 52 to which the sensor element 3 and capacitor 4 are connected, is placed in a mold while held by the holder 6, and molten resin is injected into the mold cavity. The injected molten resin cools and solidifies to form the sealing body 7. The sealing body 7 has a hole 70 formed by removing the support posts that supported the holder 6 in the mold after molding the sealing body 7. The surface of the holder 6 melts due to the heat of the molten resin, and the holder 6 becomes one with the sealing body 7. The entire holder 6 is covered by the sealing body 7 except for the portion exposed through the hole 70.

[0023] The sealing body 7 integrally includes a shaft portion 71 disposed in the through hole 111 of the knuckle 11, a cable outlet portion 72 and a fixing portion 73 disposed on one side of the through hole 111, a sensor element accommodating portion 74 disposed protruding on the other side of the through hole 111 and accommodating the sensor element 3, and a rib portion 75 disposed so as to protrude from the sensor element accommodating portion 74 toward the magnetic encoder 96. When the sealing body 7 is molded, for example, molten resin flows from the portion of the sealing body 7 that will become the cable outlet portion 72 toward the portion that will become the sensor element accommodating portion 74, which is the tip of the sensor unit 21.

[0024] The shaft portion 71 has a cylindrical shape centered on the central axis C. The outer peripheral surface 71a of the shaft portion 71 is provided with a plurality of linear protrusions 710 that elastically deform so as to come into contact with the inner surface 111a of the through-hole 111 and be crushed when the sensor unit 21 is attached to the knuckle 11. The electric wires 221, 222 of the cable 22 are led out from the sheath 223 inside the shaft portion 71. In this embodiment, the cable 22 is led out from the sealing body 7 from the cable lead-out portion 72 along the central axis C of the sensor unit 21. However, the cable 22 may be led out in a direction perpendicular to the central axis C. The fixing portion 73 is provided to extend from the cable lead-out portion 72 in a direction parallel to the rotation axis O. A collar 8 is embedded in the fixing portion 73, and the fixing portion 73 is fixed to the knuckle 11 on one side of the through-hole 111 by a bolt 97.

[0025] The sensor element accommodating portion 74 has a facing flat surface 74a that faces the magnetic encoder 96 in a direction parallel to the rotation axis O. The facing flat surface 74a is a plane perpendicular to the direction parallel to the rotation axis O. The rib portion 75 is provided so as to be continuous with the facing flat surface 74a and protrude from the sensor element accommodating portion 74 toward the magnetic encoder 96. In FIG. 1(b), the sensor element 3 held in the sensor element accommodating portion 74 is indicated by a dashed line. As shown in FIG. 1(b), the rib portion 75 is formed in an area that overlaps at least the entire length of the sensor element 3 in the axial direction of the sensor unit 21. In other words, the rib portion 75 is formed over the entire area R (see FIG. 1(b)) that is aligned with the sensor element 3 in a direction parallel to the rotation axis O.

[0026] 6, the sensor element 3 is disposed at an intermediate position between an end face 75a of the rib portion 75 on the magnetic encoder 96 side and an end face 74d of the sensor element accommodating portion 74 opposite to the magnetic encoder 96. In FIG. 6, a bisector BS of a line segment LS connecting the end face 75a of the rib portion 75 and the end face 74d of the sensor element accommodating portion 74 is shown, and the sensor element 3 is disposed at a position including the bisector BS.

[0027] The rib portion 75 includes vertical ribs 751 extending along the axial direction of the shaft portion 71 and horizontal ribs 752 extending in a horizontal direction perpendicular to the axial direction of the shaft portion 71. The vertical ribs 751 and the horizontal ribs 752 intersect closer to the shaft portion 71 than the opposing flat surface 74a of the sensor element accommodating portion 74. The end faces 75a of the rib portion 75 are formed by a continuous plane, with the end faces 751a of the vertical ribs 751 facing the magnetic encoder 96 and the end faces 752a of the horizontal ribs 752 facing the magnetic encoder 96. In other words, there is no step between the end faces 751a of the vertical ribs 751 and the end faces 752a of the horizontal ribs 752, and the end faces 751a of the vertical ribs 751 and the end faces 752a of the horizontal ribs 752 form a single continuous plane.

[0028] The opposing flat surface 74a of the sensor element accommodating portion 74 is divided into a first flat surface portion 74b and a second flat surface portion 74c that are aligned in the horizontal direction by a vertical rib 751. In the sensor element accommodating portion 74, the portion where the first flat surface portion 74b is formed is a first recessed portion 741 recessed from an end surface 751a of the vertical rib 751, and the portion where the second flat surface portion 74c is formed is a second recessed portion 742 recessed from the end surface 751a of the vertical rib 751. The first recessed portion 741 and the second recessed portion 742 are recessed in a direction away from the magnetic encoder 96.

[0029] A pair of grooves 711, 712 are formed in the shaft portion 71 at positions aligned in the axial direction with a first flat portion 74b and a second flat portion 74c, which are opposing flat surfaces 74a on one and the other sides of the vertical rib 751 in the horizontal direction. A protrusion 713 extending in the axial direction is formed between the pair of grooves 711, 712, and a linear protrusion 710 is provided at the tip of the protrusion 713 in the radial direction of the shaft portion 71.

[0030] The configuration of the sealing body 7 described above is designed to suppress deformation of the sealing body 7 due to temperature changes of the resin during molding. Specifically, deformation in the thickness direction of the sensor element accommodating portion 74, as indicated by arrow A1 in Fig. 5, is suppressed by the vertical rib 751, and deformation in the width direction of the sensor element accommodating portion 74, as indicated by arrow A2 in Fig. 5, is suppressed by the horizontal rib 752.

[0031] Furthermore, a first recess 741 and a second recess 742 are formed at the tip of the sensor unit 21, with their bottom surfaces being the first flat portion 74b and the second flat portion 74c of the opposing flat surface 74a of the sensor element accommodating portion 74. This makes the thickness of the sealing body 7, excluding the sensor element 3 and the holder 6, uniform in the thickness direction of the sensor element accommodating portion 74, thereby suppressing deformation in the thickness direction of the sensor element accommodating portion 74 due to contraction of the molten resin that constitutes the sealing body 7. Furthermore, the sensor element 3 is disposed at an intermediate position between the end face 75a of the rib portion 75 on the magnetic encoder 96 side and the end face 74d of the sensor element accommodating portion 74 opposite to the magnetic encoder 96, which also suppresses deformation in the thickness direction of the sensor element accommodating portion 74 due to contraction of the molten resin that constitutes the sealing body 7.

[0032] Furthermore, in this embodiment, the rib portions 75 are less likely to deform because no steps are formed on the end faces 75a of the rib portions 75. That is, for example, if a step were formed between the end faces 751a of the vertical ribs 751 and the end faces 752a of the horizontal ribs 752, stress would concentrate at the step, making the rib portions 75 more likely to deform. However, in this embodiment, the end faces 751a of the vertical ribs 751 and the end faces 752a of the horizontal ribs 752 form one continuous plane, so such deformation of the rib portions 75 is suppressed.

[0033] The formation of the pair of grooves 711, 712 in the shaft portion 71 adjusts the flow rate of molten resin toward the rib portion 75 and the opposing flat surface 74a of the sensor element accommodating portion 74, rather than toward the assembly 20, and contributes to the formation of a weld line W (see FIG. 3(a)) on the tip surface 21a of the sensor portion 21, where the flow rate of molten resin flowing toward the rib portion 75 and the opposing flat surface 74a of the sensor element accommodating portion 74, rather than toward the assembly 20, joins with the flow rate of molten resin flowing toward the end face 74d of the sensor element accommodating portion 74, rather than toward the assembly 20. By forming the weld line W on the tip surface 21a of the sensor portion 21, deformation of the sensor portion 21 is suppressed.

[0034] (Actions and Effects of the Embodiments) According to the embodiment described above, the characteristic shape of the sealing body 7 makes it possible to suppress deformation of the sealing body 7. This makes it possible to maintain a constant distance between the magnetic encoder 96 and the sensor element 3, thereby improving the accuracy with which the sensor element 3 detects the magnetic field of the magnetic encoder 96. Furthermore, in this embodiment, the rib portion 75 is provided so as to protrude from the opposing flat surface 74a of the sensor element accommodating portion 74 toward the magnetic encoder 96, thereby increasing the distance between the magnetic encoder 96 and the sensor element 3. However, by using a GMR element, an AMR element, or a TMR element, which has a higher magnetic field sensitivity than a Hall element, as the sensor element 3, it is possible to appropriately detect the magnetic fields of the N magnetic pole 961 and the S magnetic pole 962 of the magnetic encoder 96.

[0035] (Summary of the embodiment) Next, the technical ideas grasped from the above-described embodiments will be described by using the reference numerals and the like in the embodiments. However, the reference numerals in the following description do not limit the components in the claims to the members and the like specifically shown in the embodiments.

[0036] [1] A sensor-equipped cable (2) comprising: a sensor element (3) for detecting a physical quantity of a detection object (magnetic encoder 96); a cable (22) having a plurality of electric wires (221, 222) connected to the sensor element (3); and a sealing body (7) made of resin that seals the ends of the sensor element (3) and the cable (22), wherein the sealing body (7) has a sensor element accommodating section (74) that accommodates the sensor element (3) and has a facing flat surface (74a) facing the detection object (96), and a rib portion (75) that is continuous with the facing flat surface (74a) and protrudes from the sensor element accommodating section (74) toward the detection object (96).

[0037] [2] The sensor-equipped cable (2) described in [1] above, wherein the sensor element (3) is arranged at an intermediate position between an end face (75a) of the rib portion (75) on the side of the detection object (96) and an end face (74d) of the sensor element accommodating portion (74) on the opposite side to the detection object (96).

[0038] [3] The cable with sensor (2) described in [1] above, wherein the sealing body (7) has an axial portion (71) arranged in a through hole (111) formed in the mounting object (knuckle 11) and a fixing portion (73) fixed to the mounting object (11) on one side of the through hole (111), and the sensor element accommodating portion (74) protrudes on the other side of the through hole (111) so that the opposing flat surface (74a) faces the detection object (96).

[0039] [4] The sensor-equipped cable (2) described in [3] above, wherein the rib portion (75) includes a vertical rib (751) extending along the axial direction of the shaft portion (71) and a horizontal rib (752) extending laterally perpendicular to the axial direction, and the vertical rib (751) and the horizontal rib (752) intersect on the shaft portion (71) side relative to the opposing flat surface (74a).

[0040] [5] The sensor-equipped cable (2) described in [4] above, wherein the end face (751a) of the vertical rib (751) on the side of the detection object (96) and the end face (752a) of the horizontal rib (752) on the side of the detection object (96) are formed by a continuous plane.

[0041] [6] The sensor-equipped cable (2) described in [4] above, wherein the shaft portion (71) is formed with a pair of groove portions (711, 712) aligned in the axial direction with the opposing flat surfaces (74a) on one side and the other side of the vertical rib (751) in the horizontal direction.

[0042] [7] A cable (2) with a sensor described in any one of [1] to [6] above, wherein the detection object (96) is a magnetic encoder having a plurality of magnetic poles (961, 962) formed in the circumferential direction, and the sensor element (3) is a GMR element, an AMR element, or a TMR element.

[0043] [8] A rotation detection device (1) comprising a sensor-equipped cable (2) having a sensor portion (21) and an attachment object member (11) to which the sensor portion (21) is attached, and detecting the rotation of a rotating member (96) relative to the attachment object member (11), wherein the sensor-equipped cable (2) comprises a sensor element (3) that detects a physical quantity of the rotating member (96), a cable (22) having a plurality of electric wires (221, 222) connected to the sensor element (3), and a sealing body (7) made of resin that seals the ends of the sensor element (3) and the cable (22), wherein the sealing body (7) comprises a sensor element accommodating portion (74) that accommodates the sensor element (3) and has an opposing flat surface (74a) facing the rotating member (96), and a rib portion (75) that is continuous with the opposing flat surface (74a) and protrudes from the sensor element accommodating portion (74) toward the rotating member (96).

[0044] Although the embodiments of the present invention have been described above, the invention according to the claims is not limited to these embodiments. It should be noted that not all of the combinations of features described in the embodiments are necessarily essential to the means for solving the problems of the invention. Furthermore, the present invention can be implemented with appropriate modifications. For example, in the above embodiment, the sensor element 3 detects the direction and strength of the magnetic field of the north magnetic pole 961 and the south magnetic pole 962 of the magnetic encoder 96. However, the physical quantity detected by the sensor element of the present invention is not limited to this. For example, a sensor element that detects physical quantities such as light intensity, wavelength, or temperature may also be used. [Explanation of symbols]

[0045] 1...Rotation detection device 11...Knuckle (mounting member) 2...Sensor cable 21...Sensor part 22...Cable 221,222...Electric wire 3...sensor element 7...encapsulant 71...shaft portion 711, 712...groove portion 74: Sensor element receiving portion 74a: Opposing flat surface 74d...End face 75...Rib section 75a...End face 751...Vertical rib 751a...End face 752...Horizontal rib 752a...End face 96...Magnetic encoder (detection object) 961...N magnetic pole 962...S magnetic pole

Claims

1. a sensor element for detecting a physical quantity of an object to be detected, a cable having a plurality of electric wires connected to the sensor element, and a sealing body made of resin that seals the sensor element and an end of the cable, the sealing body includes a sensor element accommodating portion that accommodates the sensor element and has a facing plane that faces the detection target, and a rib portion that is continuous with the facing plane and protrudes from the sensor element accommodating portion toward the detection target. Cable with sensor.

2. the sensor element is disposed at an intermediate position between an end face of the rib portion on the side of the detection object and an end face of the sensor element accommodating portion on the opposite side of the detection object; The sensor-equipped cable according to claim 1 .

3. the sealing body has a shaft portion disposed in a through hole formed in the attachment target member, and a fixing portion fixed to the attachment target member on one side of the through hole, the sensor element accommodating portion protrudes from the other side of the through hole, and the opposing flat surface faces the detection target; The sensor-equipped cable according to claim 1 .

4. The rib portion includes a vertical rib extending along the axial direction of the shaft portion and a horizontal rib extending in a horizontal direction perpendicular to the axial direction, and the vertical rib and the horizontal rib intersect on the shaft portion side relative to the opposing plane. The sensor-equipped cable according to claim 3 .

5. an end surface of the vertical rib facing the detection object and an end surface of the horizontal rib facing the detection object are formed by a continuous flat surface; The sensor-equipped cable according to claim 4 .

6. A pair of grooves are formed in the shaft portion, and are aligned in the axial direction with the opposing flat surfaces on one side and the other side of the longitudinal rib in the lateral direction. The sensor-equipped cable according to claim 4 .

7. the detection object is a magnetic encoder having a plurality of magnetic poles formed in a circumferential direction, The sensor element is a GMR element, an AMR element, or a TMR element. The sensor-equipped cable according to any one of claims 1 to 6.

8. A rotation detection device comprising: a sensor-equipped cable having a sensor unit; and an attachment target member to which the sensor unit is attached, the rotation detection device detecting rotation of a rotating member relative to the attachment target member, The sensor-equipped cable includes a sensor element that detects a physical quantity of the rotating member, a cable having a plurality of electric wires connected to the sensor element, and a sealing body made of resin that seals the sensor element and an end of the cable, the sealing body includes a sensor element accommodating portion that accommodates the sensor element and has a facing plane that faces the rotating member, and a rib portion that is continuous with the facing plane and protrudes from the sensor element accommodating portion toward the rotating member. Rotation detection device.

Images