Magnetic sensor device for displacement detection, and vehicle driving device

Abstract

To secure reliability of an electric signal obtained in a sensor unit while miniaturizing magnetic flux generating means.SOLUTION: A magnetic sensor device for displacement detection comprises: magnetic flux generating means, which is disposed on a displaceable and movable member between a first position and a second position in a first direction, for generating a magnetic flux in the first direction; a sensor unit for generating an electric signal corresponding to the position of the movable member displacing between the first position and the second position, in which the electric signal corresponds to the density of the magnetic flux generated by the magnetic flux generating means; and one or more magnetic materials disposed outside of the first position in the first direction, or outside of the second position in the first direction. Magnetic flux lines pass through the one or more magnetic materials from the magnetic flux generating means through the sensor unit.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a magnetic sensor device for detecting displacement and a vehicle drive device. [Background technology]

[0002] A magnetic sensor device for detecting displacement is known that includes a magnetic flux generating means provided on a movable member that can be linearly displaced, and a sensor unit that generates an electric signal according to the magnetic flux density related to the magnetic flux generated by the magnetic flux generating means (for example, Patent Document 1).

[0003] Furthermore, in a differential drive device installed in the power transmission path from the power source to the wheels, a technology is known in which a transmitter element installed on a movable member cooperates with a sensor installed on the fixed side (housing) to continuously (linearly) monitor the distance between the transmitter element and the sensor (for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-142158 [Patent Document 2] Special Publication No. 2013-512402 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with regard to this type of magnetic sensor device for displacement detection, the limited installation space tends to impose restrictions on the size (e.g., thickness in the magnetization direction) of the magnetic flux generating means (e.g., permanent magnet). If the size of the magnetic flux generating means becomes smaller, the range over which the magnetic flux spreads in the magnetization direction becomes narrower, which may reduce the reliability of the electrical signal obtained from the sensor unit.

[0006] Therefore, in one aspect, an object of the present disclosure is to ensure the reliability of the electrical signal obtained in the sensor section while miniaturizing the magnetic flux generating means. [Means for solving the problem]

[0007] In one aspect, the present invention provides a magnetic flux generating means provided on a movable member displaceable between a first position and a second position along a first direction, the magnetic flux generating means generating a magnetic flux in the first direction; a sensor unit that generates an electric signal corresponding to the magnetic flux density of the magnetic flux generated by the magnetic flux generating means, the electric signal corresponding to the position of the movable member that changes between the first position and the second position; one or more magnetic bodies located outside the first position in the first direction and farther from the second position in the first direction, or outside the second position in the first direction and farther from the first position in the first direction, A magnetic sensor device for detecting displacement is provided, in which magnetic flux lines passing from the magnetic flux generating means through the sensor portion pass through the one or more magnetic bodies. [Effects of the Invention]

[0008] According to one aspect of the present disclosure, it is possible to ensure the reliability of the electrical signal obtained from the sensor section while miniaturizing the magnetic flux generating means. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram schematically illustrating a magnetic sensor device for detecting displacement according to an embodiment of the present invention. [Figure 2A] 10 is a diagram showing the waveform of an electric signal obtained by a sensor unit (the waveform of an electric signal corresponding to a magnetic force component in the X direction). FIG. [Figure 2B] 10 is a diagram showing the waveform of an electric signal obtained by a sensor unit (the waveform of an electric signal corresponding to a magnetic force component in the Y direction). FIG. [Figure 3] FIG. 10 is a conceptual diagram of the effect of this embodiment. [Figure 4] FIG. 1 is a skeleton diagram of a vehicle drive system. [Figure 5]FIG. 2 is a schematic diagram showing the configuration of a differential gear mechanism and an engagement mechanism. [Figure 6] FIG. 2 is an explanatory diagram of a first element and a second element. DETAILED DESCRIPTION OF THE INVENTION

[0010] Each embodiment will be described in detail below with reference to the accompanying drawings. Note that the dimensional ratios in the drawings are merely examples and are not limiting. Furthermore, shapes and the like in the drawings may be partially exaggerated for the sake of explanation. Furthermore, in the drawings, for ease of viewing, reference symbols may be assigned only to some of the parts that exist with the same attribute.

[0011] FIG. 1 is a diagram schematically illustrating a magnetic sensor device 70 for displacement detection according to this embodiment. In FIG. 1, an X direction (an example of a first direction) and a Y direction (an example of a second direction) are defined. In addition to the X direction, an X1 side and an X2 side along the X direction are also defined. In addition, a peripheral component 90 is schematically illustrated in FIG. 1. The hatched area indicating the peripheral component 90 can also be interpreted as an area into which the magnetic sensor device 70 for displacement detection (particularly the movable member 80 and the permanent magnet 10) cannot enter due to the peripheral component 90.

[0012] The displacement detection magnetic sensor device 70 detects the displacement of a displaceable movable member 80. In this embodiment, the movable member 80 is movable in the X direction between a position P1 on the X1 side and a position P2 on the X2 side (see arrow P). The movable member 80 is arbitrary, but a preferred example will be described later. Note that the movable member 80 is displaceable linearly along the X direction, but in other embodiments, the movement trajectory of the movable member 80 may include a curve.

[0013] The magnetic sensor device 70 for detecting displacement includes a permanent magnet 10, a sensor unit 12, and two magnetic bodies 21 and 22.

[0014] The permanent magnet 10 is provided on the movable member 80 so as to move integrally with the movable member 80. The magnetization direction of the permanent magnet 10 is the X direction. That is, the permanent magnet 10 is arranged with its south pole and north pole aligned in the X direction.

[0015] The permanent magnet 10 has a dimension A in the X direction. In this embodiment, the dimension A in the X direction of the permanent magnet 10 is a parameter that determines the maximum stroke (maximum displacement) in the X direction of the movable member 80. Specifically, the larger the dimension A in the X direction of the permanent magnet 10, the smaller the maximum stroke (maximum displacement) in the X direction of the movable member 80.

[0016] For example, in FIG. 1 , the movable member 80 is shown in a neutral position in the X direction. In this embodiment, the maximum displacement of the movable member 80 on the X1 side in the X direction (i.e., position P1 closest to the X1 side in the X direction within the stroke) is determined by the maximum displacement position of the permanent magnet 10 on the X1 side in the X direction (see position P3). The maximum displacement position of the permanent magnet 10 on the X1 side in the X direction is determined by the positional relationship (layout) between the permanent magnet 10 and the peripheral components 90 on the X1 side in the X direction. The same is true for the X2 side in the X direction. That is, the maximum displacement of the movable member 80 on the X2 side in the X direction (i.e., position P2 closest to the X2 side in the X direction within the stroke) is determined by the maximum displacement position of the permanent magnet 10 on the X2 side in the X direction (see position P4). The maximum displacement position of the permanent magnet 10 on the X2 side in the X direction is determined by the positional relationship (layout) between the permanent magnet 10 and the peripheral components 90 on the X2 side in the X direction.

[0017] The sensor unit 12 is provided in the magnetic field generated by the permanent magnet 10. In this embodiment, the sensor unit 12 extends in the same XY plane as the permanent magnet 10. For example, the sensor unit 12 may be arranged so as to be positioned at the center of the thickness direction of the permanent magnet 10 (direction perpendicular to the XY plane). This makes it possible to obtain a sensor output that is robust against various errors (for example, deviation within an allowable range in the mounting position).

[0018] The sensor unit 12 generates an electric signal (sensor output) corresponding to the magnetic flux density. In this embodiment, as an example, the sensor unit 12 includes two Hall elements, and generates an electric signal corresponding to the magnetic force component in the X direction and an electric signal corresponding to the magnetic force component in the Y direction. In a modified example, only the electric signal corresponding to the magnetic force component in the X direction may be generated.

[0019] The magnetic bodies 21 and 22 are arranged on both sides of the permanent magnet 10 in the X direction. The magnetic bodies 21 and 22 are arranged at positions spaced apart from the permanent magnet 10 in the X direction. That is, the magnetic body 21 is arranged at a distance from the permanent magnet 10 on the X1 side in the X direction, and the magnetic body 22 is arranged at a distance from the permanent magnet 10 on the X2 side in the X direction. The magnetic bodies 21 and 22 may be in the form of, for example, iron plates.

[0020] The magnetic bodies 21 and 22 are arranged at positions where they act on the magnetic flux, that is, they are arranged so that the magnetic flux of the permanent magnet 10 passes through them.

[0021] The magnetic bodies 21 and 22 have the function of expanding the range in the X direction of the magnetic flux lines passing through the permanent magnet 10 and the sensor unit 12. Specifically, the magnetic bodies 21 and 22 are arranged with respect to the permanent magnet 10 and the sensor unit 12 so as to expand the magnetic flux lines passing through the permanent magnet 10 and the sensor unit 12 in the X direction. In this case, the magnetic flux lines from the permanent magnet 10 passing through the sensor unit 12 pass through the magnetic bodies 21 and 22. For example, the magnetic bodies 21 and 22 may be arranged near the end of the X direction range of the magnetic flux lines (magnetic flux lines passing through the permanent magnet 10 and the sensor unit 12) when the magnetic bodies 21 and 22 are not provided. In this case, the magnetic flux lines from the permanent magnet 10 are attracted by the magnetic bodies 21 and 22 and are strengthened (expanded) in the X direction. In this embodiment, as described above, the magnetic bodies 21 and 22 are arranged on both sides of the permanent magnet 10 in the X direction, and therefore the range in the X direction of the magnetic flux lines passing through the permanent magnet 10 and the sensor unit 12 can be efficiently expanded.

[0022] The magnetic bodies 21 and 22 are preferably disposed between the sensor unit 12 and the permanent magnet 10 in the Y direction so that the magnetic flux passing through the magnetic bodies 21 and 22 passes through the sensor unit 12. For example, the magnetic bodies 21 and 22 may be disposed near the midpoint between the sensor unit 12 and the permanent magnet 10 in the Y direction. This makes it possible to efficiently expand the range in the X direction of the magnetic flux lines passing through the permanent magnet 10 and the sensor unit 12.

[0023] Next, the effects of this embodiment will be described in relation to the electrical signal obtained by the sensor unit 12 with reference to FIGS. 2A to 3. FIG.

[0024] 2A and 2B are diagrams showing waveforms of electric signals obtained by the sensor unit 12, where Fig. 2A is the waveform of the electric signal corresponding to the magnetic force component in the X direction, and Fig. 2B is the waveform of the electric signal corresponding to the magnetic force component in the Y direction. Fig. 3 is a conceptual diagram of the effect of this embodiment.

[0025] 2A and 2B, the waveform of the electrical signal obtained by the sensor unit 12 according to this embodiment is shown by a solid line, while the waveform of the comparative example is shown by a dotted line. The comparative example, although not shown, is configured without the magnetic bodies 21 and 22. In other words, the comparative example differs from this embodiment only in that it does not include the magnetic bodies 21 and 22.

[0026] Incidentally, when the displacement amount over the entire movable range of the movable member 80 is linearly detected (monitored) by the sensor unit 12, it is useful for the magnetic flux of the permanent magnet 10 to pass through the sensor unit 12 appropriately over the entire movable range of the movable member 80.

[0027] For example, if the range in the X direction of the magnetic flux generated by the permanent magnet 10 is relatively narrow, the magnetic flux of the permanent magnet 10 cannot pass through the sensor unit 12 properly throughout the entire movable range of the movable member 80, which may reduce the reliability of the electrical signal obtained by the sensor unit 12. Specifically, as shown by the dashed lines in Figures 2A and 2B, no sensor output is obtained near both ends of the movable range of the movable member 80 (i.e., the sensor output waveform is less than one cycle of the sine waveform), which may reduce the reliability of the electrical signal obtained by the sensor unit 12.

[0028] In order to expand the range of the magnetic flux generated by the permanent magnet 10 in the X direction, one method is to increase the dimension A of the permanent magnet 10 in the X direction, as conceptually shown by arrow R2 in Figure 3. However, this method tends to reduce the maximum stroke (maximum displacement) of the movable member 80 in the X direction. This is particularly noticeable in cases where peripheral components 90 are arranged on both sides of the permanent magnet 10 in the X direction. In particular, in automotive applications, various automotive components compete for limited mounting space, and mounting conditions tend to be strict.

[0029] In contrast to this, according to this embodiment, by arranging the magnetic bodies 21 and 22 as described above, it is possible to expand the range in the X direction of the magnetic flux generated by the permanent magnet 10 without having to increase the dimension A in the X direction of the permanent magnet 10. That is, according to this embodiment, by arranging the magnetic bodies 21 and 22 as described above, it is possible to expand the range in the X direction of the magnetic flux generated by the permanent magnet 10 equivalently to increasing the dimension A in the X direction of the permanent magnet 10. As a result, as shown by the dashed lines in Figures 2A and 2B, it is possible to obtain sensor output even near both ends of the movable range of the movable member 80.

[0030] In this way, according to this embodiment, the permanent magnet 10 can be made smaller, while ensuring the reliability of the electrical signal obtained by the sensor section 12.

[0031] Next, with reference to FIG. 4 and subsequent figures, a preferred application example of the displacement detecting magnetic sensor device 70 of this embodiment will be described, in which it is applied to a vehicle drive device 17.

[0032] In the following, first, a vehicle drive system 100 to which the vehicle drive device 17 of this embodiment can be suitably applied will be described, and then the vehicle drive device 17 of this embodiment will be described.

[0033] [Entire drive system] Fig. 4 is a skeleton diagram of a vehicle drive system 100 including a rotating electric machine 1 and a power transmission mechanism 7. In Fig. 4, an X direction and an X1 side and an X2 side along the X direction are defined, as in Fig. 1. The X direction is parallel to the direction of a first axis A1 (hereinafter also referred to as the "axial direction").

[0034] The vehicle drive system 100 is mounted on a vehicle. The type of vehicle is arbitrary, and the vehicle may be a four-wheel vehicle or a vehicle with other wheels.

[0035] In the example shown in FIG. 4, the vehicle drive system 100 includes a vehicle drive device 17 and left and right output members 18A, 18B.

[0036] The vehicle drive device 17 includes the rotating electric machine 1 and a power transmission mechanism 7. In FIG.

[0037] The rotating electric machine 1 functions as a drive source for vehicle wheels W. The rotating electric machine 1 may also function as a generator.

[0038] The power transmission mechanism 7 is provided in a power transmission path connecting the rotating electric machine 1 and the wheels W, and transmits power (rotational torque) from the rotating electric machine 1 to the wheels W.

[0039] The power transmission mechanism 7 includes an input member 3 , a counter gear mechanism 4 , and a differential gear mechanism 5 .

[0040] The input member 3 has an input shaft 31 and an input gear 32. The input shaft 31 is a rotating member that rotates around the first axis A1. The input gear 32 is a gear that transmits rotational torque (driving force) from the rotating electric machine 1 to the counter gear mechanism 4. The input gear 32 is provided on the input shaft 31 of the input member 3 so as to rotate integrally with the input shaft 31 of the input member 3.

[0041] The counter gear mechanism 4 is disposed in the power transmission path between the input member 3 and the differential gear mechanism 5. The counter gear mechanism 4 has a counter shaft 41, a first counter gear 42, and a second counter gear 43.

[0042] The counter shaft 41 is a rotating member that rotates around the second axis A2. The second axis A2 extends parallel to the first axis A1. The first counter gear 42 is an input element of the counter gear mechanism 4. The first counter gear 42 meshes with the input gear 32 of the input member 3. The first counter gear 42 is connected to the counter shaft 41 so as to rotate integrally with the counter shaft 41.

[0043] The second counter gear 43 is an output element of the counter gear mechanism 4. In this embodiment, for example, the second counter gear 43 is formed to have a smaller diameter than the first counter gear 42. The second counter gear 43 is provided on the counter shaft 41 so as to rotate integrally with the counter shaft 41.

[0044] The differential gear mechanism 5 is disposed on a third axis A3, which serves as its rotation axis. The third axis A3 extends parallel to the first axis A1. The differential gear mechanism 5 distributes the driving force transmitted from the rotating electric machine 1 to left and right output members 18A, 18B. The configuration of the differential gear mechanism 5 will be described later.

[0045] The left and right output members 18A, 18B are drivingly connected to the left and right wheels W, respectively. The left and right output members 18A, 18B transmit the driving force distributed by the differential gear mechanism 5 to the wheels W. Note that the left and right output members 18A, 18B may be configured from two or more members.

[0046] In this way, the rotating electric machine 1 drives the wheels W via the power transmission mechanism 7. However, in other embodiments, other speed reduction mechanisms such as a planetary gear mechanism may be used.

[0047] [Differential gear mechanism and engagement mechanism] Fig. 5 is a schematic diagram showing the configuration of the differential gear mechanism 5 and the engagement mechanism 58. In Fig. 5, in addition to the differential gear mechanism 5 and the engagement mechanism 58, a solenoid 59 and the like are also shown. In Fig. 5, the member marked with the symbol BR schematically represents a bearing.

[0048] The differential gear mechanism 5 includes a differential input gear 51, which meshes with the second counter gear 43 (see FIG. 4) of the counter gear mechanism 4. The differential gear mechanism 5 also includes a differential case 52, within which a differential mechanism carrier 53 is supported so as to be rotatable about a third axis A3. The differential mechanism carrier 53 houses a pinion shaft 54, a pinion gear 55, left and right side gears 56, etc. The left and right side gears 56 are connected to left and right output members 18A, 18B (see FIG. 4), respectively, so as to rotate integrally with them.

[0049] In this embodiment, the vehicle drive device 17 (see FIG. 4) further includes an engagement mechanism 58. The engagement mechanism 58 is provided between the differential case 52 and the differential mechanism carrier 53. When the engagement mechanism 58 is in an engaged state, power transmission between the differential case 52 and the differential mechanism carrier 53 is possible, and when the engagement mechanism 58 is in a disengaged state, power transmission between the differential case 52 and the differential mechanism carrier 53 is disabled.

[0050] Specifically, when the engagement mechanism 58 is in an engaged state, the differential case 52 and the differential mechanism carrier 53 are integrated. In this case, when the differential case 52 and the differential mechanism carrier 53 rotate about the third axis A3, a normal differential gear mechanism function is realized, and power is transmitted to the left and right output members 18A, 18B (see FIG. 4). On the other hand, when the engagement mechanism 58 is in a disengaged state, the differential case 52 and the differential mechanism carrier 53 are mechanically separated. In this case, even if the differential case 52 rotates about the third axis A3, the differential mechanism carrier 53 does not rotate as a result, and even if the differential mechanism carrier 53 rotates about the third axis A3, the differential case 52 does not rotate as a result.

[0051] In this embodiment, the engagement mechanism 58 is in the form of a dog clutch and includes a driven member 580, a first element 581 provided on the differential mechanism carrier 53, and a second element 582 provided on the driven member 580. The driven member 580 is supported by the differential case 52 in a manner such that it rotates integrally with the differential case 52 and is reciprocable along the third axis A3. The driven member 580 has a clutch ring 5802 equipped with the second element 582 at its end on the X1 side in the X direction. The driven member 580 is driven by a solenoid 59, which will be described later. Note that in other embodiments, the engagement mechanism 58 may be configured so that friction plates abut against each other.

[0052] Fig. 6 is an explanatory diagram of the first element 581 (see Fig. 5) and the second element 582 (see Fig. 5), and is a perspective view showing them in an expanded state spread apart so that the meshing sides are visible. In Fig. 6, x, y, and z coordinate axes for showing the relationship in the expanded state correspond to the differential mechanism carrier 53 and the clutch ring 5802 of the driven member 580. In this case, the x coordinate axis corresponds to the direction of the third axis A3.

[0053] The first element 581 and the second element 582 each have meshing teeth 5810, 5820 around the third axis A3. The teeth 5810, 5820 are provided at a constant pitch along the circumferential direction around the third axis A3, protruding in the axial direction along the third axis A3. The pitches of the teeth 5810, 5820 may be the same. In this case, a phase shift can occur between the teeth 5810 of the first element 581 and the teeth 5820 of the second element 582, with the maximum phase shift corresponding to half the pitch of the teeth 5810, 5820. When the maximum shift occurs, the teeth 5810, 5820 are in a phase relationship that allows them to mesh with each other.

[0054] 6, the first element 581 and the second element 582 can transition between an engaged state and a disengaged state by relative axial movement along the third axis A3. In the engaged state in which the first element 581 and the second element 582 mesh with each other, transmission of rotational torque (i.e., power transmission) about the third axis A3 is possible between the first element 581 and the second element 582.

[0055] In this embodiment, the reciprocating movement of the driven member 580 along the third axis A3 realizes an engaged state (a state in which the first element 581 and the second element 582 are engaged) and a disengaged state of the engagement mechanism 58. Specifically, when the driven member 580 moves to the engaged position which is the end position on the X1 side in the X direction, the engagement mechanism 58 realizes the engaged state, and when the driven member 580 moves to the disengaged position which is the end position on the X2 side in the X direction, the disengaged state of the engagement mechanism 58.

[0056] 5, the driven member 580 is biased by a spring element 5800 toward a disengagement position on the X2 side in the X direction. The spring element 5800 is expandable and contractible along the third axis A3, and applies a biasing force to the driven member 580 in the direction of the third axis A3, that is, a biasing force toward the X2 side in the X direction. Therefore, when the driven member 580 is not receiving a force from the solenoid 59 toward the X1 side in the X direction (a solenoid thrust force, described later), the driven member 580 is located at the disengagement position on the X2 side in the X direction.

[0057] 5, the driven member 580 is connected to a mover 590 of the solenoid 59 so as to be movable in the X-direction X1 in conjunction with the mover 590. The driven member 580 reciprocates along the third axis A3 via the mover 590. That is, the solenoid 59 drives the driven member 580 via the mover 590 when a coil 592 is energized.

[0058] In this embodiment, the vehicle drive device 17 further includes the above-described magnetic sensor device 70 for displacement detection, as schematically shown in Fig. 5. In the example shown in Fig. 5, the magnetic sensor device 70 for displacement detection is provided so as to move integrally with the driven member 580. In this case, the magnetic sensor device 70 for displacement detection can generate an electric signal corresponding to each position of the driven member 580 in the X direction.

[0059] 5, the displacement detecting magnetic sensor device 70 does not need to be disposed within the unit of the differential gear mechanism 5, but may be disposed outside the unit (for example, outside the case of the differential gear mechanism 5). In this case, although it is easier to ensure a mounting space compared to inside the unit, it may still be difficult to ensure a sufficient mounting space due to peripheral components such as the peripheral component 90 shown in FIG.

[0060] In this regard, according to this embodiment, as described above, the dimension A (see FIG. 1) of the permanent magnet 10 in the X direction can be minimized for the displacement detection magnetic sensor device 70, making it suitable for the vehicle drive device 17 in which it is difficult to secure such mounting space.

[0061] 5 shows an example in which a dog clutch is applied to the differential gear mechanism 5, but this embodiment can also be applied to a configuration in which a dog clutch is incorporated into a transmission mechanism other than the differential gear mechanism 5. For example, this embodiment can also be applied to a configuration in which a dog clutch is incorporated into a transmission mechanism.

[0062] Although each embodiment has been described in detail above, it is not limited to the specific embodiment, and various modifications and changes are possible within the scope of the claims. It is also possible to combine all or a plurality of components of the above-described embodiments.

[0063] For example, in the above-described embodiment, the magnetic sensor device for detecting displacement 70 includes the permanent magnet 10 as a magnetic flux generating means, but instead of the permanent magnet 10, an electromagnet may be used.

[0064] In addition, in the above-described embodiment, the magnetic bodies 21 and 22 are provided, but it is also possible to provide only one of the magnetic bodies 21 and 22. In this case, the above-described advantageous effects are still achieved compared to the case where the magnetic bodies 21 and 22 are not provided. [Explanation of symbols]

[0065] 70...magnetic sensor device for detecting displacement, 10...permanent magnet (magnetic flux generating means), 12...sensor unit, 21, 22...magnetic body, 1...rotating electric machine (power source), W...wheel, 3...input member, 18A, 18B...output member, 58...engagement mechanism, 59...solenoid, 590...mover, P1...position (first position), P2...position (second position)

Claims

1. a magnetic flux generating means provided on a movable member displaceable between a first position and a second position along a first direction, the magnetic flux generating means generating a magnetic flux in the first direction; a sensor unit that generates an electric signal corresponding to the magnetic flux density of the magnetic flux generated by the magnetic flux generating means, the electric signal corresponding to the position of the movable member that changes between the first position and the second position; one or more magnetic bodies located outside the first position in the first direction and farther from the second position in the first direction, or outside the second position in the first direction and farther from the first position in the first direction, The magnetic sensor device for detecting displacement, wherein magnetic flux lines passing from the magnetic flux generating means through the sensor portion pass through the one or more magnetic bodies.

2. 2. The magnetic sensor device for displacement detection according to claim 1, wherein the one or more magnetic bodies include a first magnetic body arranged on one side of the magnetic flux generating means in the first direction, and a second magnetic body arranged on the other side of the magnetic flux generating means in the first direction.

3. when a direction orthogonal to the first direction is defined as a second direction, the magnetic flux generating means, the sensor unit, the first magnetic body, and the second magnetic body are arranged to pass through a plane that includes both the first direction and the second direction, 3. The magnetic sensor device for detecting displacement according to claim 2, wherein the first magnetic body and the second magnetic body are located between the magnetic flux generating means and the sensor portion in the second direction.

4. 4. The magnetic sensor device for displacement detection according to claim 3, wherein the magnetic flux generating means is disposed relative to peripheral components in such a manner that a dimension of the magnetic flux generating means in the first direction determines a maximum displacement amount of the movable member in the first direction.

5. an engagement mechanism that is provided between an input member and an output member that are provided in a power transmission path from a power source to a wheel, and that selectively establishes an engaged state in which power can be transmitted between the input member and the output member, and a disengaged state in which power cannot be transmitted between the input member and the output member; a solenoid having a movable element mechanically connected to the engagement mechanism, the solenoid moving a driven member of the engagement mechanism via the movable element; a magnetic flux generating means provided on a movable member that is movable integrally with the mover and displaceable between a first position and a second position along a first direction, the magnetic flux generating means generating a magnetic flux in the first direction; a sensor unit that generates an electric signal corresponding to the magnetic flux density of the magnetic flux generated by the magnetic flux generating means, the electric signal corresponding to the position of the movable member that changes between the first position and the second position; one or more magnetic bodies provided on the outside in the first direction between the first position and the second position, The one or more magnetic bodies are provided relative to the magnetic flux generating means and the sensor unit so as to expand magnetic flux lines passing through the magnetic flux generating means and the sensor unit in the first direction.

Images