Rotation detection device

Abstract

The present application provides a kind of rotation detection device with multiple magnetic sensors and can inhibit the large-scale of shell part.Two detection parts (300) of magnetic sensor (30) are separated from each other, the minimum distance of two detection parts (300) of magnetic sensor (30) is 0.05mm or more and 2.00mm or less, and the molded resin enters between two detection parts (300) of magnetic sensor (30).

Description

Technical Field

[0001] The present invention relates to a rotation detection device, for example, for detecting the rotational speed of a rotating component. Background Technology

[0002] Currently, a rotation detection device is known, for example for a bearing unit of a wheel, to detect the rotational speed of a rotating component that rotates together with the wheel (see, for example, Patent Document 1).

[0003] Patent Document 1 describes a rotation detection device comprising: a component to be detected, which is mounted on a rotating component and has a plurality of magnetic poles along the circumference of the rotating component; and a magnetic sensor, which is mounted on a fixed component that rotatably supports the rotating component and has a detection element for detecting the magnetic field of the component to be detected.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2013-47636 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] However, as mentioned above, in a rotation detection device for measuring the rotational speed of a wheel, there is a need to use multiple magnetic sensors so that the rotational speed of the wheel can be detected even if the magnetic sensor malfunctions, or so that the rotational speed of the wheel can be detected with higher precision.

[0009] When multiple magnetic sensors are housed within the housing, the overall size of the housing becomes large, raising concerns that it may be impossible to insert them into the retaining holes of the housing. Therefore, it is desirable to minimize the increase in the size of the housing even when multiple magnetic sensors are housed.

[0010] Therefore, the object of the present invention is to provide a rotation detection device having multiple magnetic sensors and capable of suppressing the enlargement of the housing portion.

[0011] Solution for solving the problem

[0012] To address the aforementioned issues, the present invention provides a rotation detection device comprising: a component to be detected, which is mounted on and rotates integrally with the rotating component; and a sensor unit disposed opposite to the component to be detected, the sensor unit comprising: two magnetic sensors, each having a detection unit including a magnetic detection element for detecting a magnetic field from the component to be detected, and the detection units being arranged in the direction of the rotation axis; and a housing portion comprising a molding resin uniformly covering the two magnetic sensors, and having a facing surface opposite to the component to be detected, wherein the detection units of the two magnetic sensors are separated from each other, the minimum distance between the detection units of the two magnetic sensors is 0.05 mm or more and 2.00 mm or less, and the molding resin is inserted between the detection units of the two magnetic sensors.

[0013] The effects of the invention are as follows.

[0014] According to the present invention, a rotation detection device having multiple magnetic sensors and capable of suppressing the enlargement of the housing portion can be provided. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view illustrating a structural example of a rotation detection device according to an embodiment of the present invention and a wheel bearing device for a vehicle having the rotation detection device.

[0016] Figure 2 This is a 3D view of the sensor section.

[0017] Figure 3 (a) is a cross-sectional view of the sensor section, and (b) is a top view of the first magnetic sensor and the wire.

[0018] Figure 4 It is an illustration of the flow of resin during resin molding.

[0019] Figure 5 This is an enlarged cross-sectional view of the main part of the shell section of modified Example 2.

[0020] Figure 6 It is a cross-sectional view along line X-X'.

[0021] Symbol Explanation

[0022] 1—Rotation detection device, 2—Magnetic encoder (detected component), 3—Sensor section, 30—Magnetic sensor, 30a—First magnetic sensor, 30b—Second magnetic sensor, 300—Detection section, 301—Connecting terminal, 301a—Bending section, 31—Housing section, 314—Opposing surface, 4—Cable, 9—Steering knuckle (fixed component), 11—Inner ring (rotating component). Detailed Implementation

[0023] [Implementation Method]

[0024] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0025] (Structure of wheel bearing assembly 10)

[0026] Figure 1 This is a cross-sectional view showing a structural example of the rotation detection device of this embodiment and a wheel bearing device for a vehicle having the rotation detection device.

[0027] The wheel bearing assembly 10 includes: an inner ring 11 as a rotating component, having a cylindrical main body 110 and a flange 111 for mounting a wheel; an outer ring 12 disposed on the outer periphery of the main body 110 of the inner ring 11; a plurality of spherical rolling elements 13 disposed between a pair of track surfaces 11b, 11b formed on the outer peripheral surface 11a of the inner ring 11 and a pair of track surfaces 12b, 12b formed on the inner peripheral surface 12a of the outer ring 12, and rolling on the two track surfaces 11b, 12b; and a rotation detection device 1 that detects the rotational speed (i.e., wheel speed) of the inner ring 11 relative to the outer ring 12.

[0028] At the center of the main body portion 110 of the inner ring 11, a through hole is formed along its rotation axis O, and a spline fitting portion 110a for connecting a drive shaft (not shown) is formed on the inner surface of the through hole. Furthermore, a pair of track surfaces 11b, 11b of the inner ring 11 are formed parallel to each other in a manner that extends circumferentially.

[0029] The flange portion 111 of the inner ring 11 protrudes radially outward from the main body portion 110 and is integrally formed with the main body portion 110. A plurality of through holes 111a are formed in the flange portion 111, and bolts for mounting a wheel (not shown) are pressed into the plurality of through holes 111a.

[0030] The outer ring 12 is formed into a cylindrical shape and is made of multiple bolts 91. Figure 1 (Only one is shown) A steering knuckle 9 fixed to the vehicle body. The steering knuckle 9 is an example of a fixed component that rotatably supports the inner ring 11. A pair of track surfaces 12b, 12b of the outer ring 12 are formed parallel to each other in a manner that opposes and extends circumferentially to a pair of track surfaces 11b, 11b of the inner ring 11. A seal 14 is disposed at the end of the flange portion 111 of the inner ring 11 in the outer ring 12 and between the outer ring 12 and the inner ring 11.

[0031] A retaining hole 90 is formed in the steering knuckle 9 to hold the sensor part 3 of the rotation detection device 1, which will be described below. The shape of the cross section of the retaining hole 90 orthogonal to the central axis is circular, and it extends through the steering knuckle 9 in a direction intersecting the rotation axis O. More specifically, the retaining hole 90 extends through the steering knuckle 9 radially along the rotation axis O. The sensor part 3 (housing part 31) is inserted into the retaining hole 90 in the direction intersecting the rotation axis O.

[0032] (Description of Rotation Detection Device 1)

[0033] Figure 2 This is a 3D view of the sensor section. Furthermore, Figure 3 (a) is a cross-sectional view of the sensor section. Figure 3 (b) is a top view of the first magnetic sensor and the wire.

[0034] like Figures 1-3 As shown, the rotation detection device 1 includes: a magnetic encoder 2, which is the component being detected, mounted on an inner ring 11, which is a rotating component, and having a plurality of magnetic poles (not shown) arranged circumferentially around the rotation axis (rotation axis O) of the inner ring 11; and a sensor unit 3, which is mounted on a steering knuckle 9, which is a fixed component and does not rotate with the rotation of the inner ring 11, and is arranged opposite to the magnetic encoder 2. In this embodiment, for example, the rotation detection device 1 detects the change in the magnetic field accompanying the rotation of the component being detected to detect the rotational speed of the component being detected. The rotation detection device 1 is used, for example, in an anti-lock braking system (ABS).

[0035] The magnetic encoder 2 is formed as a ring with a thickness in a direction parallel to the rotation axis O. The magnetic encoder 2 is supported by a support member 112 fixed to the outer peripheral surface 11a of the inner ring 11, and is mounted to rotate integrally with the inner ring 11. Furthermore, the magnetic encoder 2 has N and S magnetic poles that are opposite to the sensor section 3 and arranged alternately in the circumferential direction.

[0036] The sensor unit 3 is located at the end of the cable 4. The cable with the sensor unit 3 located at the end of the cable 4 is a cable 100 with an attached sensor. In this embodiment, the front ends of the magnetic encoder 2 and the sensor unit 3 (the opposing surfaces 314 hereinafter) are opposite each other in an axial direction parallel to the rotation axis O.

[0037] The cable 4 has two pairs of wires 41 corresponding to the two magnetic sensors 30. Each wire 41 has: a center conductor 41a, which is composed of a stranded conductor made of wires with good conductivity such as copper; and an insulator 41b, which covers the outer periphery of the center conductor 41a and is composed of an insulating resin such as cross-linked polyethylene. Furthermore, the cable 4 also has a sheath 42 that covers both pairs (four) of the wires 41 together.

[0038] At the end of cable 4, two pairs of wires 41 protrude from sheath 42, and at the end of wire 41, center conductor 41a protrudes from insulator 41b. The center conductor 41a exposed from insulator 41b is electrically connected to the corresponding connection terminal 301 of magnetic sensor 30 by soldering. In this embodiment, after joining (bonding) the wires of center conductor 41a together and forming a straight joint 411 at the end of center conductor 41a, the center conductor 41a is connected to the connection terminal 301 by resistance soldering the joint 411 to the end of connection terminal 301.

[0039] In the rotation detection device 1 of this embodiment, the sensor part 3 has: two magnetic sensors 30; and a housing part 31, which is provided to cover the two magnetic sensors 30 together and is made of molding resin (hereinafter sometimes simply referred to as resin).

[0040] The magnetic sensor 30 includes a plate-shaped detection section 300, which includes a magnetic detection element (not shown) for detecting the magnetic field from the magnetic encoder 2; and a pair of connection terminals 301 extending from the detection section 300. In this embodiment, the magnetic detection element is composed of a GMR (Giant Magneto Resistive) element. Furthermore, AMR (Anisotropic Magneto Resistive) elements, TMR (Tunneling Magneto Resistive) elements, Hall elements, etc., can also be used as the magnetic detection element.

[0041] The detection unit 300 includes a magnetic detection element for detecting the magnetic field from the magnetic encoder 2 and a molded resin portion 300a serving as a cover for the magnetic detection element. The detection unit 300 is formed into a plate shape that is approximately rectangular (one corner of the rectangle is chamfered) when viewed from above. The detection unit 300 may also include a signal processing circuit (not shown) for processing the signal output from the magnetic detection element. The signal processing circuit may also be covered by the molded resin portion 300a along with the magnetic detection element.

[0042] A pair of connecting terminals 301 extend from one long side of the detection unit 300 (the long side not connected to the chamfered corner) in a direction perpendicular to the long side, and the two connecting terminals 301 are formed parallel to each other. In this embodiment, the two connecting terminals 301 are formed in the shape of a strip (an elongated plate), and the center conductor 41a (joint portion 411) of the corresponding wire 41 is electrically connected to its front end (the end on the side opposite to the detection unit 300).

[0043] Although not shown in the figure, a capacitor element for noise suppression is connected between the two connection terminals 301, and a capacitor element protection part 302 formed by resin molding is provided so as to cover the capacitor element and the connection terminal 301 connected to the capacitor element.

[0044] Two magnetic sensors 30 are arranged such that the detection unit 300 coincides with the sensor unit 3 in the opposing direction of the magnetic encoder 2. Hereinafter, the magnetic sensor 30 arranged on the side of the magnetic encoder 2 will be referred to as the first magnetic sensor 30a, and the magnetic sensor 30 arranged on the side away from the magnetic encoder 2 will be referred to as the second magnetic sensor 30b. The details of the arrangement of the two magnetic sensors 30a and 30b will be described below.

[0045] The housing portion 31 integrally forms a main body portion 310 that covers the ends of the magnetic sensor 30 and the cable 4, and a flange portion 311 for fixing the sensor portion 3 to the steering knuckle 9. A bolt hole 312 is formed in the flange portion 311 for the bolt 92 (see reference) used to fix the sensor portion 3 to the steering knuckle 9. Figure 1 A metal collar 313 is provided in the bolt hole 312 and along the inner circumferential surface of the bolt hole 312. The collar 313 is used to suppress the deformation of the flange 311 when the bolt is fixed.

[0046] A flat opposing surface 314 is formed on the side of the front end of the main body 310 of the housing 31 (the end opposite to the extension side of the cable 4) to face the magnetic encoder 2. With the opposing surface 314 facing the magnetic encoder 2 (in an axial position parallel to the rotation axis O), the sensor part 3 is fixed to the steering knuckle 9. Furthermore, the opposing surface 314 is not limited to a flat surface; it can also be a surface with an arc (e.g., a semi-circular shape).

[0047] As the housing part 31, for example, a component made of PA (polyamide) 612, nylon 66 (nylon is a registered trademark), PBT (polybutylene terephthalate), etc., can be used. Furthermore, as the resin used for the housing part 31, a resin in which glass filler is mixed into the above-mentioned resin can also be used.

[0048] (Configuration of the first magnetic sensor 30a and the second magnetic sensor 30b, etc.)

[0049] In the rotation detection device 1 of this embodiment, the detection portion 300 of the first magnetic sensor 30a and the detection portion 300 of the second magnetic sensor 30b are arranged in the direction of the rotation axis O (overlapping when viewed along the direction of the rotation axis O). Furthermore, in this embodiment, the detection portions 300 of the first magnetic sensor 30a and the second magnetic sensor 30b are arranged in the direction of the rotation axis O along a portion of the magnetic encoder 2. Moreover, the detection portions 300 of the first magnetic sensor 30a and the second magnetic sensor 30b are separated in the direction of the rotation axis O with a minimum distance of 0.05 mm or more and 2.00 mm or less. As will be explained below, in this embodiment, the detection portion 300 of the first magnetic sensor 30a is inclined relative to the detection portion 300 of the second magnetic sensor 30b. Therefore, the minimum distance between the detection portions 300 of the first magnetic sensor 30a and the second magnetic sensor 30b is, for example, [missing information]. Figure 5 The distance is as shown in D1. Furthermore, the detection section 300 of the first magnetic sensor 30a may not be tilted relative to the detection section 300 of the second magnetic sensor 30b (i.e., it may be parallel). In this case, the distance between the detection section 300 of the first magnetic sensor 30a and the detection section 300 of the second magnetic sensor 30b is constant within the range where the detection sections 300 of the first magnetic sensor 30a and the second magnetic sensor 30b are facing each other. That is, in this case, the distance between the detection sections 300 of the first magnetic sensor 30a and the detection section 300 of the second magnetic sensor 30b is 0.05 mm or more and 2.00 mm or less within the range where the detection sections 300 of the first magnetic sensor 30a and the second magnetic sensor 30b are facing each other.

[0050] As described above, the detection section 300 of the first magnetic sensor 30a and the detection section 300 of the second magnetic sensor 30b are arranged in the direction of the rotation axis O. Therefore, even when multiple magnetic sensors 30 are used for redundancy or improved detection accuracy, the enlargement of the housing section 31 can be suppressed. More specifically, the length (width of the front end of the magnetic encoder 2 side of the housing section 31) in the direction orthogonal to the rotation axis O can be suppressed from becoming longer.

[0051] Furthermore, by separating the detection section 300 of the first magnetic sensor 30a from the detection section 300 of the second magnetic sensor 30b, such as Figure 3 As shown in (a), the molding resin constituting the housing portion 31 enters between the two detection portions 300. Thus, as... Figure 3 As shown in (a), the molding resin surrounds the circumferential (in cross-section) of each of the two detection sections 300. This improves the retention of the two detection sections 300 by the housing section 31.

[0052] Furthermore, the minimum distance between the detection section 300 of the first magnetic sensor 30a and the detection section 300 of the second magnetic sensor 30b is 0.05 mm or more and 2.00 mm or less. By making this distance 0.05 mm or more, the molding resin can easily enter between the two detection sections 300 during resin molding of the housing 31. If the distance is less than 0.05 mm, gaps may occur between the two detection sections 300 during resin molding of the housing 31 where the molding resin does not enter. Moreover, by making this distance 2.00 mm or less, the decrease in detection sensitivity of the detection section 300 of the second magnetic sensor 30b can be suppressed. If the distance is greater than 2.00 mm, the detection section 300 of the second magnetic sensor 30b will be too far away from the magnetic encoder 2, and the detection sensitivity may decrease significantly. In addition, the minimum distance between the detection section 300 of the first magnetic sensor 30a and the detection section 300 of the second magnetic sensor 30b is more preferably 0.10 mm or more and 1.00 mm or less. This allows the resin to more easily enter between the two detection units 300, and further suppresses the decrease in the detection sensitivity of the detection unit 300 of the second magnetic sensor 30b.

[0053] In the rotation detection device 1 of this embodiment, the detection section 300 of the first magnetic sensor 30a disposed on the magnetic encoder 2 side is arranged at an angle relative to the opposing surface 314. The first magnetic sensor 30a is configured such that the short side direction (the extension direction of the connecting terminal 301) of the detection section 300 is inclined relative to the opposing surface. The long side direction of the detection section 300 is parallel to the opposing surface 314. Furthermore, the detection section 300 of the first magnetic sensor 30a is configured such that the closer it is to the extension side of the connecting terminal 301, the further away it is from the opposing surface 314.

[0054] By arranging the detection section 300 of the first magnetic sensor 30a at an angle relative to the opposing surface 314, the detection section 300 of the magnetic detection element in the detection section 300 can be brought closer to the opposing surface 314, thereby further reducing the gap between the detection section D of the magnetic detection element and the magnetic encoder 2 and improving the detection sensitivity.

[0055] Furthermore, by arranging the detection section 300 of the first magnetic sensor 30a at an angle relative to the opposing surface 314, compared to arranging the detection section 300 parallel to the opposing surface 314, resin is more likely to enter between the metal mold and the detection section 300 during resin molding of the housing section 31, making it less prone to molding defects. Specifically, as... Figure 4As shown by arrow A, during resin molding of the housing portion 31, resin flows from the side with a wider gap between the detection portion 300 of the first magnetic sensor 30a and the metal mold 5 to the side with a narrower gap (from right to left in the diagram). This allows resin to easily enter the space between the detection portion 300 of the first magnetic sensor 30a and the metal mold 5, thus reducing the likelihood of molding defects. Furthermore, although in Figure 4 The illustration is omitted, but during the resin molding of the housing part 31, it is preferable to place the two magnetic sensors 30a and 30b in the metal mold 5 in a state where they are held in the resin support.

[0056] Furthermore, in this embodiment, the capacitor element protection part 302 is configured to protrude toward the opposing surface 314 of the connection terminal 301. However, by tilting the first magnetic sensor 30a, the detection part 300 can be brought close to the opposing surface 314, and the capacitor element protection part 302 can be prevented from protruding from the housing part 31.

[0057] If the distance (minimum distance) d between the detection section 300 of the first magnetic sensor 30a and the opposing surface 314 is too small, there is a concern that poor molding may occur even if the first magnetic sensor 30a is tilted. Therefore, the distance d is preferably 0.20 mm or more. In this embodiment, by making the distance between the capacitor element protection section 302 and the opposing surface 314 equal to the above-mentioned distance d, the resin can easily enter between the capacitor element protection section 302 and the metal mold 5, making it more difficult to produce poor molding. Furthermore, the distance d is preferably 2.00 mm or less. This can suppress the decrease in detection sensitivity of the detection section 300 of the first magnetic sensor 30a (as it moves away from the magnetic encoder 2). The distance d is more preferably 0.40 mm or more and 1.50 mm or less.

[0058] Furthermore, if the angle θ between the detection section 300 of the first magnetic sensor 30a and the opposing surface 314 is too small, the resin will have difficulty entering between the detection section 300 and the metal mold 5. Therefore, the angle θ is preferably 3° or more. Moreover, if the angle θ is too large, the detection section D of the magnetic detection element will move away from the opposing surface 314, which may reduce the detection sensitivity. Therefore, the angle θ is preferably 10° or less. The angle θ is more preferably 4° or more and 9° or less.

[0059] In the rotation detection device 1, the magnetic detection element included in the detection unit 300 is configured to detect a direction perpendicular to the thickness direction of the detection unit 300 and the extension direction of the connecting terminal 301. Figure 3 The magnetic field in (b) is in the vertical direction and the long side direction of the detection unit 300. Therefore, even when the detection unit 300 is tilted relative to the opposing surface 314 (tilted towards the short side direction of the detection unit 300), the detection direction of the magnetic field in the magnetic detection element remains parallel to the opposing surface 314.

[0060] The detection section 300 is configured such that the detection section D of the magnetic detection element is located on the opposing surface 314 side relative to the center of the detection section 300 in the thickness direction. This allows the detection section D to be closer to the opposing surface 314, thereby reducing the gap between the detection section D of the magnetic detection element and the magnetic encoder 2 and improving detection sensitivity.

[0061] Furthermore, in the rotation detection device 1, the second magnetic sensor 30b is configured such that its detection section 300 is inclined relative to the detection section 300 of the first magnetic sensor 30a. In other words, the detection section 300 of the first magnetic sensor 30a is inclined relative to the detection section 300 of the second magnetic sensor 30b. In this embodiment, the inclination angle of the detection section 300 of the second magnetic sensor 30b relative to the opposing surface 314 is smaller than the inclination angle (θ) of the detection section 300 of the first magnetic sensor 30a relative to the opposing surface 314. More specifically, in this embodiment, the detection section 300 of the second magnetic sensor 30b is arranged parallel to the opposing surface 314. The distance between the detection sections 300 of the two magnetic sensors 30a and 30b gradually increases from the extension side of the connecting terminal 301 towards the front end side of the sensor section 3.

[0062] Furthermore, the second magnetic sensor 30b has a bent portion 301a at its connection terminal 301. In this embodiment, the bent portion 301a is formed by bending the connection terminal 301 of the second magnetic sensor 30b into a crank shape. As a result, the detection portion 300 of the second magnetic sensor 30b can be brought closer to the opposing surface 314 (the detection portion 300 side of the first magnetic sensor 30a), and interference between the capacitor element protection portion 302 of the second magnetic sensor 30b and the first magnetic sensor 30a can be suppressed.

[0063] Furthermore, by forming a crank-shaped bend 301a at the connection terminal 301 of the second magnetic sensor 30b, the end of the connection terminal 301 (the end opposite to the detection unit 300) can be made parallel to the extension direction of the cable 4. This allows for wiring without forcibly bending the center conductor 41a of the wire 41, simplifying the wiring layout within the sensor unit 3. In this embodiment, since a straight joint 411 is provided at the end of the center conductor 41a, and a portion of the joint 411 protrudes from the joint terminal 301, the length of the center conductor 41a that can be freely bent is relatively short. However, by making the end of the connection terminal 301 parallel to the extension direction of the cable 4, the center conductor 41a can be laid out without forcibly bending it.

[0064] (Variation Example 1)

[0065] In this embodiment, the detection section 300 of the second magnetic sensor 30b is arranged at an angle relative to the detection section 300 of the first magnetic sensor 30a. However, this is not a limitation; the detection section 300 of the second magnetic sensor 30b may also be arranged parallel to the detection section 300 of the first magnetic sensor 30a. This allows the detection section 300 of the second magnetic sensor 30b to be closer to the opposing surface 314, thereby further reducing the gap between the detection section D of the magnetic detection element and the magnetic encoder 2, and improving the detection sensitivity of the second magnetic sensor 30b.

[0066] (Variation Example 2)

[0067] Figure 5 This is an enlarged cross-sectional view of the main part of the shell section of modified Example 2. Figure 6 This is a cross-sectional view along line X-X'. In detail, Figure 5 This is a cross-sectional view of a portion of the front end of the main body 310 of the housing portion 31 in Modified Example 2.

[0068] In variation example 2, such as Figure 5 and Figure 6 As shown, a retaining member 6 is provided between the detection section 300 of the first magnetic sensor 30a and the detection section 300 of the second magnetic sensor 30b to maintain the separation of the two detection sections 300. The retaining member 6 is preferably made of a material of the same type as that constituting the housing section 31, namely PA (polyamide) 612, nylon 66 (nylon is a registered trademark), or PBT (polybutylene terephthalate). The retaining member 6, together with the first magnetic sensor 30a and the second magnetic sensor 30b, is covered by the housing section 31.

[0069] The component 6 remains in contact with the two detection units 300. In variant example 2, as... Figure 5 As shown, the retaining member 6 is trapezoidal in cross-section. More specifically, in cross-section, the retaining member 6 has an upper base extending from the connecting terminal 301, a lower base extending from the front end of the sensor portion 3 (longer than the upper base), a first leg connecting one end of the upper base to one end of the lower base and inclined relative to the opposing surface 314, and a second leg connecting the other end of the upper base to the other end of the lower base and parallel to the opposing surface 314. The detection portion 300 of the first magnetic sensor 30a contacts the first leg. The detection portion 300 of the second magnetic sensor 30b contacts the second leg. Using this retaining member 6, the minimum distance D1 between the detection portions 300 of the first magnetic sensor 30a and the detection portions 300 of the second magnetic sensor 30b is maintained at 0.05 mm or more and 2.00 mm or less.

[0070] like Figure 6 As shown, retaining component 6 is rectangular in shape when viewed in cross-section along X-X'. That is, retaining component 6 is a trapezoidal columnar component. Figure 6As shown, the width of component 6 is maintained (the length in the direction orthogonal to the rotation axis O). Figure 6 The length in the left-right direction is smaller than the width of the two detection parts 300. Therefore, resin can enter the spaces S1 and S2 on both sides of the retaining member 6. In other words, Modification 2 is a structure that includes a retaining member 6 to hold the two detection parts 300 in a separated state, and resin enters between the two detection parts 300. Using this structure, in Modification 2, the molding resin (constituting the housing part 31) also surrounds the circumference of each of the two detection parts 300.

[0071] According to Modification 2, by utilizing the resin pressure during resin molding of the housing portion 31, the variation in the distance between the two detection portions 300 can be suppressed, and the retention of the housing portion 31 for the two detection portions 300 can be improved as described in the above embodiment.

[0072] In Modification 2, as an example, the retaining member 6 is configured as a trapezoid in cross-section. However, when the detection part 300 of the first magnetic sensor 30a and the detection part 300 of the second magnetic sensor 30b are parallel, the retaining member 6 can also be rectangular, square, or parallelogram-shaped in cross-section. Furthermore, the retaining member 6 can also be integrally formed with a wire support (not shown) that holds the two pairs of wires 41. In this case, it is preferable that the wire support is made of the same type of material as the retaining member 6. Moreover, the retaining member 6 can also be square in X-X' cross-section.

[0073] (Summary of Implementation Methods)

[0074] Next, the technical ideas derived from the embodiments described above will be described by reference to symbols and the like. However, the symbols and the like used below do not limit the constituent elements in the claims to the components specifically shown in the embodiments.

[0075] [1] A rotation detection device 1 includes: a detection component 2, which is mounted on a rotating component 11 and rotates integrally with the rotating component 11; and a sensor part 3, which is disposed opposite to the detection component 2, the sensor part 3 having: two magnetic sensors 30, each having a detection part 300, the detection part 300 including a magnetic detection element for detecting a magnetic field from the detection component 2, and the detection parts 300 being arranged in the direction of the rotation axis O; and a housing part 31, which is made of molding resin that is uniformly covered with the two magnetic sensors 30, and has a facing surface 314 opposite to the detection component, the detection parts 300 of the two magnetic sensors 30 being separated from each other, the minimum distance between the detection parts 300 of the two magnetic sensors 30 being 0.05 mm or more and 2.00 mm or less, and the molding resin entering between the detection parts 300 of the two magnetic sensors 30.

[0076] [2] According to the rotation detection device 1 described in [1], the distance between the detection parts 300 of the two magnetic sensors 30 is 0.10 mm or more and 1.00 mm or less.

[0077] [3] According to the rotation detection device 1 described in [1] or [2], the detection part 300 of the first magnetic sensor 30a, which is located on the side closer to the detected component 2, is arranged at an angle relative to the opposing surface 314.

[0078] [4] The rotation detection device 1 according to any one of [1] to [3] has a holding member 6, which is covered together with the two magnetic sensors 30 by the housing part 31, and holds the detection part 300 of the two magnetic sensors 30 in a separated state and is disposed between the detection part 300 of the two magnetic sensors 30.

[0079] [5] According to the rotation detection device 1 described in [4], the width of the holding member 6 is smaller than the width of the detection part 300 of the two magnetic sensors 30.

[0080] The embodiments of the present invention have been described above, but the embodiments described above do not limit the invention as claimed. Furthermore, it should be noted that all combinations of features described in the embodiments are not limited to solutions necessary for solving the problems of the invention.

[0081] The present invention can be implemented with appropriate modifications without departing from its spirit. For example, in the above embodiment, the case where the two magnetic sensors 30a and 30b have a capacitor element for noise suppression and a capacitor element protection part 302 has been described, but the capacitor element and the capacitor element protection part 302 can be omitted.

[0082] Furthermore, in the above embodiment, the connection terminal 301 of the first magnetic sensor 30a is made straight, but it is not limited to this; the connection terminal 301 may also have a bent portion. As a result, the end of the connection terminal 301 (the end on the side opposite to the detection unit 300) can be made parallel to the extension direction of the cable 4, thereby further improving the wiring layout within the sensor unit 3.

[0083] Furthermore, in the above embodiment, the case where an opposing surface 314 is formed on the side of the front end of the sensor unit 3 has been described, but it is not limited to this; the front end surface of the sensor unit 3 may also be an opposing surface 314. In this case, the cable 4 extends in a direction parallel to the rotation axis O.

[0084] Furthermore, the number of magnetic sensors 30 can be three or more. In this case, the minimum distance between adjacent detection units 300 should be 0.05 mm or more and 2.00 mm or less.

Claims

1. A rotation detecting device characterized by comprising: Possessing: a detected component mounted to a rotating component and rotating integrally with the rotating component; and a sensor portion disposed opposite the detected component, the sensor portion having: two magnetic sensors having detection portions including magnetic detection elements that detect a magnetic field from the detected component, the detection portions being arranged in the direction of the rotational axis of the rotating component; and a housing portion composed of a molded resin that covers the two magnetic sensors together and has an opposing surface opposite the detected component, the detection portions of the two magnetic sensors being separated from each other, the minimum distance between the detection portions of the two magnetic sensors being 0.05 mm or more and 2.00 mm or less, the molded resin entering between the detection portions of the two magnetic sensors, the detection portion of a first magnetic sensor of the two magnetic sensors disposed on the side closer to the detected component being disposed obliquely with respect to the opposing surface.

2. The rotation detection device according to claim 1, characterized in that, the distance between the detection portions of the two magnetic sensors is 0.10 mm or more and 1.00 mm or less.

3. The rotation detection device according to claim 1 or 2, characterized in that, having a holding component that covers the two magnetic sensors together with the housing portion, is disposed between the detection portions of the two magnetic sensors, and maintains the separated state of the detection portions of the two magnetic sensors.

4. The rotation detection device according to claim 3, characterized in that, the width of the holding component is smaller than the width of the detection portions of the two magnetic sensors.

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