Physical quantity detection sensor, its mounting method, and rotating body assembly

Abstract

To provide a physical quantity detection sensor which is simple in a mounting structure and a mounting method, and is unitized.SOLUTION: A physical quantity detection sensor 1 includes: a magnet 4; a support member 6 which supports the magnet 4 and is connectable to a rotor 2; a housing 8 for rotatably supporting the support member 6; a magnetic field detection element 5 which is provided so as to face the magnet 4; and a cover part 9 for holding the magnetic field detection element 5 and covering the housing 8. The rotor 2 and the support member 6 are connectable to each other by press-fitting. The cover part 9 has a pressing part 91 that can be pressed in a direction X at which the support member 6 is connected to the rotor 2, the cover part 9 presses the support member 6 in the direction X by pressing the pressing part 91, and the support member 6 is connected to the rotor 2.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a physical quantity detection sensor, a mounting method thereof, and a rotating body assembly.

Background Art

[0002] A magnetic angle sensor for detecting the rotation angle of a rotating body such as a rotating shaft is known. Patent Document 1 describes a magnetic encoder in which a magnet and a magnetic field detection element are unitized. The magnetic encoder is attached to a motor shaft via a shaft coupling.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the magnetic encoder (magnetic angle sensor) described in Patent Document 1, since the relative positions of the magnet and the magnetic field detection element are fixed, displacement between them is unlikely to occur during installation. Therefore, the calibration work of the magnetic angle sensor can be performed before installation, and a decrease in the measurement accuracy of the angle sensor is also unlikely to occur. However, since the encoder is attached to the motor shaft via a shaft coupling, the attachment structure and attachment method are complicated. This problem can occur not only with magnetic angle sensors but also with other types of physical quantity detection sensors.

[0005] An object of the present invention is to provide a physical quantity detection sensor with a simple and unitized attachment structure and attachment method.

Means for Solving the Problems

[0006] The physical quantity detection sensor of the present invention includes a physical quantity generating device that generates a physical quantity, a support member that supports the physical quantity generating device and can be connected to a rotating body, A physical quantity detection element is provided opposite the physical quantity generator,Support member is rotatably supported. and support the detection element Housing and , The device has a cover portion that covers the wedge. The rotating body and the support member can be connected to each other by press-fitting. The cover portion has a pressing portion that can press the support member in the direction in which it is connected to the rotating body, and when the pressing portion of the cover portion is pressed, the cover portion presses the support member in the above direction, thereby connecting the support member to the rotating body. The cover portion has at least one abutment portion that can abut against the support member, and when the pressing portion is pressed, the abutment portion abuts against the support member and presses the support member in a direction. The physical quantity detection sensor has a substrate equipped with a detection element and supported by a housing, a gap is formed between the substrate and the housing, and at least one abutment portion is movable through the gap. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a physical quantity detection sensor with a simple mounting structure and mounting method, and that is integrated into a single unit. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view of an angle sensor according to one embodiment of the present invention. [Figure 2] Figure 1 is an exploded perspective view of the angle sensor. [Figure 3] Figure 1 is a cross-sectional view of a rotating body assembly including an angle sensor. [Figure 4] This is a modified example of a structure in which a support member is fixed to a rotating shaft. [Figure 5] This is an exploded perspective view of the housing and cover. [Figure 6] This is a floor plan of the housing. [Figure 7] This is a perspective view of the cover. [Figure 8] This diagram conceptually shows the relationship between the angle of the rotating shaft output by the magnetic field detection unit and the actual angle of the rotating shaft. [Figure 9] This is a magnified view of the hanging portion and the projection. [Figure 10] This is a magnified view of the claw portion and the opening. [Figure 11] This diagram shows how to attach the angle sensor to the rotating shaft. [Figure 12] This is a diagram showing a modified example of a support member. [Figure 13] This is a perspective view of the angle sensor according to a modified example. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the drawings. In the following description and drawings, the connection direction X means the direction in which the support member 6 is connected to the rotating shaft 2, and is parallel to the rotational axis RC of the rotating body 2. The radial direction R is perpendicular to the connection direction X and means the direction away from the rotational axis RC of the rotating body 2, starting from the rotational axis RC. In the following embodiments, the rotating body 2 is the rotating shaft 2, but the shape of the rotating body 2 is not limited as long as it is rotatable around the rotational axis. The physical quantity detection sensor of the present invention can be applied to, for example, a rotational speed sensor, but here we will describe an angle sensor.

[0010] Figure 1 shows a perspective view of the angle sensor 1, Figure 2 shows an exploded perspective view of the angle sensor 1, and Figure 3 shows a cross-sectional view of the rotating body assembly 100 including the angle sensor 1. The harness 15 is not shown in Figures 2 and 3. As shown in Figure 3, the rotating body assembly 100 includes the angle sensor 1, a rotating shaft 2, and a drive device 3 for the rotating shaft 2. The drive device 3 is not limited, but may be, for example, a motor or an engine. The angle sensor 1 in this embodiment is a magnetic angle sensor. The angle sensor 1 includes a magnet 4 and a magnetic field detection element 5 that detects the strength of the magnetic field generated by the magnet 4.

[0011] The angle sensor 1 has a support member 6 that supports the magnet 4. The support member 6 is made of resin or metal. The magnet 4 is cylindrical and is separated into a north pole and a south pole in the radial direction R. The support member 6 can be attached to a rotating shaft 2 that is rotatable around the rotation center axis RC. As shown in FIG. 2, the support member 6 has a protruding portion 61 that protrudes in the connecting direction X, and the rotating shaft 2 has a hole 21 that engages with the protruding portion 61 on the end face facing the support member 6. Both the protruding portion 61 and the hole 21 are circular, and the diameters of the protruding portion 61 and the hole 21 are substantially equal. The protruding portion 61 is press-fitted into the hole 21. That is, the rotating shaft 2 and the support member 6 can be connected to each other by press-fitting. The support member 6 has a positioning pin 62 that protrudes outward in the radial direction R, and the rotating shaft 2 has a groove portion 22 that engages with the positioning pin 62. Thereby, the support member 6 is attached to the rotating shaft 2 at a predetermined angular position. Although not shown, the rotating shaft 2 may have a protruding portion that protrudes in the connecting direction X, and the support member 6 may have a hole that engages with the protruding portion. When the absolute angle of the rotating shaft 2 is required as the output of the angle sensor 1, it is preferable to provide the positioning pin 62 and the groove portion 22, but if only the amount of rotation angle needs to be known, these are unnecessary.

[0012] FIG. 4 shows a modification of the structure for fixing the support member 6 to the rotating shaft 2. The support member 6 has a protruding portion 63 that protrudes in the connecting direction X, and the rotating shaft 2 has a hole 23 that engages with the protruding portion 63. The protruding portion 63 and the hole 23 have a substantially rectangular cross section, and the shape and size of the cross section are substantially equal. The protruding portion 63 is press-fitted into the hole 23. Although not shown, the rotating shaft 2 may have a protruding portion that protrudes in the connecting direction X, and the support member 6 may have a hole that engages with the protruding portion. Also with these structures, the support member 6 is attached to the rotating shaft 2 at a predetermined angular position. The shapes of the protruding portion 63 and the hole 23 are not limited to rectangular, and any non-circular shape may be used. The method of fixing the support member 6 to the rotating shaft 2 is not limited to these, and adhesion or screwing on the side surface of the rotating shaft 2 can also be used.

[0013] As shown in Figure 3, the magnetic field detection element 5 has a magnetic field detection unit 51 composed of a magnetoresistive element (e.g., AMR element, TMR element, GMR element) or a Hall element. The magnetic field detection element 5 is provided on the surface of the circuit board 7 facing the magnet 4. The magnetic field detection element 5 is provided facing the magnet 4 in the connecting direction X, and the magnetic field detection unit 51 is approximately coincident with the rotational center axis RC of the rotating shaft 2. It is also possible to provide multiple magnetic field detection units 51, in which case each magnetic field detection unit 51 can be provided at a position offset radially R from the rotational center axis RC of the rotating shaft 2. Since the center of the magnet 4 coincides with the rotational center axis RC of the rotating shaft 2, the magnetic flux generated by the magnet 4 rotates around the rotational center axis RC. The magnetic field detection element 5 detects the change in magnetic field strength accompanying the rotation of the rotating shaft 2 and measures the rotation angle of the rotating shaft 2.

[0014] The angle sensor 1 has a housing 8 that rotatably supports a support member 6, and a cover portion 9 that covers the housing 8. The cover portion 9 is attached to the housing 8 in a manner described later. The housing 8 and cover portion 9 are made of resin (for example, engineering plastics such as polyphenylene sulfide (PPS) resin or nylon) or metal. Figure 5 shows an exploded perspective view of the housing 8 and cover portion 9, Figure 6 shows a plan view of the housing 8 from the connection direction X, and Figure 7 shows a perspective view of the cover portion 9 from diagonally below. The housing 8 has a cylindrical portion 81 that houses the support member 6, and a tongue portion 82 that protrudes radially R from the cylindrical portion 81. As shown in Figure 2, a bolt 11 is inserted into a slit 83 in the tongue portion 82, and the bolt 11 is screwed into a screw hole 131 provided in the base member 13, thereby restraining the housing 8 to the base member 13. A bearing 12 is provided between the cylindrical portion 81 and the support member 6, and the support member 6 is rotatably supported by the housing 8.

[0015] The cover portion 9 covers the upper opening 84 of the cylindrical portion 81. The cover portion 9 is generally a disk-shaped member. The circuit board 7 is provided so as to cross the upper opening 84 of the cylindrical portion 81 and is screwed to a stepped portion 85 along the peripheral wall of the cylindrical portion 81. As shown in FIG. 6, since the circuit board 7 is generally rectangular, a gap G having a shape defined by an arc and a chord is formed between the circuit board 7 and the cylindrical portion 81 when viewed from the connection direction X. A harness 15 is connected to the back surface of the surface of the circuit board 7 where the magnetic field detection element 5 is provided, and as shown in FIG. 1, the harness 15 extends in a direction away from the angle sensor 1.

[0016] Thus, the magnetic field detection element 5 is Housing 8 supported, the magnet 4 is supported by the housing 8 via the bearing 12 and the support member 6, and the cover portion 9 is attached to the housing 8. As a result, the relative positional relationship between the magnetic field detection element 5 and the magnet 4 is fixed. The positional deviation between the magnet 4 and the magnetic field detection element 5 that may occur when the magnet 4 and the magnetic field detection element 5 are attached separately does not occur in principle. The positional deviation affects the measurement accuracy of the angle sensor 1. Since the magnet 4 and the magnetic field detection element 5 are unitized, the operator can attach the magnet 4 and the magnetic field detection element 5 simultaneously while maintaining their relative positional relationship simply by attaching the angle sensor 1 to the rotating shaft 2. The housing 8, the cover portion 9, and the support member 6 are supported only by the rotating shaft 2 in the connection direction X. Therefore, the attachment work of the angle sensor 1 is simplified, and it is easy to ensure the measurement accuracy.

[0017] The magnetic field detection element 5 has a signal processing unit 52 that processes a signal output from the magnetic field detection unit 51. The signal output from the magnetic field detection unit 51 is a voltage signal corresponding to the rotation angle of the rotating shaft 2, but it does not necessarily have a linear relationship with the rotation angle. Also, although the positional deviation between the magnet 4 and the magnetic field detection element 5 does not occur in principle as described above, the relative position of the magnet 4 and the magnetic field detection element 5 may vary depending on the product due to the positional deviation when mounting the magnet 4 on the support member 6 or when mounting the magnetic field detection element 5 on the housing 8.

[0018] Figure 8 conceptually shows the relationship between the rotation angle of the rotating shaft 2 output by the magnetic field detection unit 51 and the actual rotation angle of the rotating shaft 2. The two do not perfectly match, and the rotation angle output by the magnetic field detection unit 51 contains an error. The signal processing unit 52 calibrates (corrects) the output of the magnetic field detection unit 51 based on this error. For example, if the output of the magnetic field detection unit 51 corresponds to 60° when the actual rotation angle is 70°, the signal processing unit 52 corrects the output of the magnetic field detection unit 51 by a value equivalent to 10°. The error of the magnetic field detection unit 51 is measured in advance before the angle sensor 1 is shipped, and the relationship between the output of the magnetic field detection unit 51 and the correction value is determined and stored in the signal processing unit 52. Preferably, the relationship between the output of the magnetic field detection unit 51 and the correction value is stored in the form of a table. By calibrating the output of the magnetic field detection unit 51 in advance, variations in output from product to product are suppressed, and calibration after the angle sensor 1 is attached to the rotating shaft 2 becomes unnecessary.

[0019] Next, the structure and mounting method for attaching the angle sensor 1 to the rotating shaft 2 will be described. The cover portion 9 has a pressing portion 91 at its center in the radial direction R. The pressing portion 91 has a circular pressing surface 92 that can be pressed in the connecting direction X by a finger or the like. Since the pressing surface 92 is a recess surrounded by the peripheral edge portion 9B of the cover portion 9, it can be reliably pressed with a finger. The cover portion 9 has at least one (two in this embodiment) abutment portion 93 on the back side of the pressing surface 92 that can abut against the support member 6. Since the abutment portion 93 is inserted into the gap G between the substrate 7 and the housing 8, it is movable through the gap G in the connecting direction X. As shown in Figures 6 and 7, each of the abutment portions 93 has a cross-sectional shape defined by an arc and a chord, that is, substantially the same cross-sectional shape as the gap G.

[0020] As shown in Figure 5, the housing 8 has a side wall 87 that encircles the peripheral edge 86. Figure 9 is an enlarged view of part A in Figure 3, showing an enlarged view of the hanger 98 and projection 88. The cover portion 9 has an inner circumferential portion 96 and an outer circumferential portion 97 that cooperate to form a circumferential groove 95 that accommodates the side wall 87. The cover portion 9 has at least one (two in this embodiment) elastic portion 98 that elastically deforms when the pressing portion 91 is pressed in the connecting direction X. The elastic portion 98 is a plurality of hanger pieces connected to the outer circumferential portion 97. The hanger pieces 98 are arranged at 180° intervals along the side wall 87 and extend along the side wall 87 radially R outward from the side wall 87. The housing 8 has projection 88 with a slope 89 that contacts the hanger pieces 98 and elastically deforms them, as will be described later. As shown in Figure 6, the projection 88 are arranged at 180° intervals along the housing 8.

[0021] Figure 10 shows an enlarged view of the claw portion 8A and the opening 99. The housing 8 has the claw portion 8A, and the cover portion 9 has an opening 99 that can engage with the claw portion 8A. The claw portion 8A has an engaging portion 8B that engages with the peripheral edge 9A of the opening 99 at the front in the connecting direction X, and a slope 8C at the rear in the connecting direction X. There are four claw portions 8A and four openings 99, and each of the four claw portions 8A is at the same angular position as each of the four openings 99. The angular positions of the claw portion 8A and the opening 99 are not limited, but as shown in Figure 6, in this embodiment the claw portions 8A and the opening 99 are provided at approximately 90° intervals. As will be described later, the claw portion 8A engages with the opening 99, preventing the cover portion 9 from coming out of the housing 8.

[0022] (How to install angle sensor 1) The method for attaching the angle sensor 1 to the rotating shaft will be explained with reference to Figure 11. Figure 9 shows the movement of the cover portion 9 and the housing 8 during attachment. First, as shown in Figure 11(a), the angle sensor 1 is set above the rotating shaft 2. The angular positions of the two protrusions 88 of the housing 8 and the hanging pieces 98 of the two cover portions 9 are aligned. This also aligns the positions of the four claw portions 8A of the housing 8 and the four openings 99 of the cover portion 9.

[0023] When the protruding portion 61 of the angle sensor 1 contacts the hole 21 of the rotating shaft 2, the pressing portion 91 is pressed, as shown in Figure 11(b). The pressing portion 91 moves in the connecting direction X, and the abutting portion 93 abuts against the support member 6, pressing the support member 6 in the connecting direction X. By further pressing the pressing portion 91, the protruding portion 61 of the support member 6 is press-fitted into the hole 21 of the rotating shaft 2, as shown in Figure 11(c). In this way, the support member 6 and the rotating shaft 2 are connected to each other by press-fitting when the cover portion 9 presses the support member 6 in the connecting direction X.

[0024] The functions of the hanging piece 98 and the projection 88 will be explained with reference to Figure 9. Figure 9 shows an enlarged view of the hanging piece 98 and the projection 88. Referring to Figure 9(a), the hanging piece 98 is located above the projection 88 and away from it. When the pressing part 91 is pressed in the connecting direction X, the hanging piece 98 comes into contact with the projection 88, as shown in Figure 9(b). When the pressing part 91 is pressed further in the connecting direction X, the hanging piece 98 rides up onto the slope 89 of the projection 88, as shown in Figure 9(c), and the hanging piece 98 elastically deforms radially outward R.

[0025] When the support member 6 is pressed onto the rotating shaft 2, the pressure of the pressing part 91 is released. The cover part 9 separates from the support member 6 as the pressure of the pressing part 91 is released. When the pressure is released, the elastic part 98 generates an elastic restoring force that separates the cover part 9 from the support member 6 (in the opposite direction of the connection direction X). Specifically, the transition from Figure 9(c) to Figure 9(b) occurs automatically, and the hanging piece 98 that was riding on the slope 89 moves upward (in the opposite direction of the connection direction X). Figure 9(b) corresponds to Figure 11(d). Therefore, according to this embodiment, the angle sensor 1 can be attached to the rotating shaft 2 without using jigs or tools. Also, since the cover part 9 separates from the support member 6 after the angle sensor 1 is attached, the angle sensor 1 does not affect the rotation of the rotating shaft 2.

[0026] Referring to Figure 10, the functions of the claw portion 8A and the opening 99 will be explained. As shown in Figure 10(a), before the pressing portion 91 is pressed in the connecting direction X, the claw portion 8A is housed in the opening 99. Since the length of the opening 99 in the connecting direction X is longer than the length of the claw portion 8A in the connecting direction X, when the claw portion 8A is pressed into the support member 6 and the rotating shaft 2, the lower engaging portion 8B of the claw portion 8A is separated from the peripheral edge 9A of the opening 99. When the pressure of the pressing portion 91 is released, the opening 99 moves upward, but as shown in Figure 10(b), the peripheral edge 9A of the opening 99 engages with the engaging portion 8B, reducing the possibility of the cover portion 9 being pulled out of the housing 8. Furthermore, since the movement of the cover portion 9 in the connecting direction X is prevented by the hanging piece 98 being restrained by the projection 88, the cover portion 9 is fixed to the housing 8.

[0027] The present invention is not limited to the embodiments described above. For example, the elastic portion 98 and the projection portion 88 can be omitted. In this case, the cover portion 9 may remain in contact with the support member 6, but if the rotation of the rotating shaft 2 is slow, the angle sensor 1 is unlikely to affect the rotation of the rotating shaft 2. Also, as shown in Figure 12, the support member 6 may have at least one projection portion 64 that abuts against the abutment portion 93. It is preferable that at least one projection portion 64 is located between the connection portion (protruding portion 61) between the support member 6 and the rotating shaft 2 and the substrate 7 in order to avoid interference with the substrate 7. The abutment portion 93 can be shortened and its strength can be easily ensured, making it possible to reduce the cross-sectional area of ​​the abutment portion 93. The abutment portion 93 is not limited to two. The shape of the abutment portion 93 is also not limited to the embodiment, and may be, for example, a plurality of rod-shaped members. Alternatively, the magnetic field detection element 5 may be supported by the cover portion 9 instead of the housing 8.

[0028] The present invention can also be applied to angle sensors other than magnetic ones. Examples of other types of angle sensors include optical angle sensors and electromagnetic induction angle sensors. Figure 13(a) shows a schematic configuration of the optical angle sensor 101. The optical angle sensor 101 has a code wheel 103 attached to a rotating body 102 and rotating together with the rotating body 102, a light-emitting element 104 provided on one side of the code wheel 103 with respect to the rotational axis RC direction of the rotating body 102, and a light-receiving element 105 provided on the other side. The code wheel 103 has a number of slits 106 arranged in the circumferential direction. When the rotating body 102 rotates, the light-emitting element 104 alternately passes between a position facing the slits 106 and between the slits 106. In the former position, light emitted from the light-emitting element 104 passes through the slits 106 and is detected by the light-receiving element 105. In the latter position, light emitted from the light-emitting element 104 is not detected by the light-receiving element 105. The rotation angle of the rotating body 102 can be detected by the above principle. The physical quantity generating device consists of a light-emitting element 104 and a code wheel 103, the detection element is a light-receiving element 105, and the physical quantity is the intensity of light.

[0029] Figure 13(b) shows a schematic configuration of the electromagnetic induction angle sensor 201. The electromagnetic induction angle sensor 201 has a rotor 203 attached to a rotating body 202 and rotating together with the rotating body 202, and a stator 204 fixed opposite the rotor 203. A receiver coil 205 is provided on the stator 204. An electrical signal is generated in the receiver coil 205 by a change in reluctance between the rotating rotor 203 and the fixed stator 204. The rotation angle of the rotating body 202 is detected based on this electrical signal.

[0030] (Note) This specification includes the following disclosures. [Configuration 1] A physical quantity generator that generates physical quantities, A support member that supports the physical quantity generating device and can be connected to a rotating body, A housing that rotatably supports the aforementioned support member, A physical quantity detection element is provided opposite the physical quantity generating device, It has a cover portion that holds the detection element and covers the housing, The rotating body and the support member can be connected to each other by press-fitting. The cover portion has a pressing portion that can press the support member in the direction in which it is connected to the rotating body, The cover portion is a physical quantity detection sensor that, when the pressing portion is pressed, presses the support member in the aforementioned direction, thereby connecting the support member with the rotating body. [Configuration 2] The physical quantity detection sensor according to configuration 1, wherein the cover portion has at least one abutment portion that can abut against the support member, and when the pressing portion is pressed, the abutment portion abuts against the support member and presses the support member in the direction. [Configuration 3] A physical quantity detection sensor according to configuration 2, comprising the detection element and a substrate supported by the cover portion, wherein a gap is formed between the substrate and the housing, and at least one abutment portion is movable through the gap. [Structure 4] The physical quantity detection sensor according to configuration 3, wherein the support member has at least one projection that abuts against the abutment portion, and the at least one projection is located between the connection portion between the support member and the rotating body and the substrate. [Composition 5] The physical quantity detection sensor according to configuration 3 or 4, wherein the at least one abutment portion is a plurality of abutment portions, and each of the plurality of abutment portions has substantially the same cross-section as the gap. [Composition 6] The housing has a claw portion, The physical quantity detection sensor according to any one of configurations 1 to 5, wherein the cover portion has an opening that can engage with the claw portion, and the claw portion has an engaging portion that engages with the peripheral edge of the opening at the front in the direction. [Composition 7] The physical quantity detection sensor according to any one of configurations 1 to 6, wherein the housing has a peripheral edge surrounding the pressing portion, and the pressing portion is a recess surrounded by the peripheral edge. [Structure 8] The physical quantity detection sensor according to any one of configurations 1 to 7, wherein the cover portion separates from the support member when the pressure of the pressing portion is released. [Composition 9] The physical quantity detection sensor according to configuration 8, wherein the cover portion has at least one elastic portion that elastically deforms when the pressing portion is pressed in the direction, and the elastic portion generates an elastic restoring force in a direction that separates the cover portion from the support member when the pressing is released. [Configuration 10] The housing has side walls that encircle the periphery, The cover portion has an inner portion and an outer portion that cooperate to form a circumferential groove that accommodates the side wall, The at least one elastic portion is a plurality of hanging pieces connected to the outer periphery, The physical quantity detection sensor according to configuration 9, wherein the plurality of hanging pieces are arranged at intervals along the side wall and extend along the side wall outside the side wall. [Composition 11] The housing has a projection with a slope, The physical quantity detection sensor according to configuration 10, wherein the hanging piece elastically deforms by riding up onto the slope when the pressing portion is pressed in the direction. [Composition 12] The aforementioned physical quantity generating device is a magnet, The detection element is a magnetic field detection element provided opposite the magnet. The physical quantity is magnetic field strength, as described in any one of configurations 1 to 11, for the physical quantity detection sensor. [Composition 13] The physical quantity generating device comprises a light-emitting element and a rotatable code wheel equipped with multiple slits. The detection element is a light-receiving element provided on the opposite side of the light-emitting element with respect to the code wheel. The physical quantity is the light intensity, as described in any one of configurations 1 to 11, for the physical quantity detection sensor. [Composition 14] The physical quantity generating device consists of a fixed excitation coil and a rotatable induction coil. The detection element is a fixed receiving coil, The physical quantity is an induced electromotive force, as described in any one of configurations 1 to 11, for the physical quantity detection sensor. [Composition 15] A physical quantity detection sensor as described in any one of configurations 1 to 14, A rotating body to which the support member is attached, A rotating body assembly having the aforementioned rotating body drive device. [Composition 16] The support member has a positioning pin that protrudes outward in a direction perpendicular to the rotational axis of the rotating body. The rotating body assembly according to configuration 15, wherein the rotating body has a groove that engages with the positioning pin. [Composition 17] The rotating body assembly according to configuration 15, wherein one of the support member and the rotating body has a protruding portion that extends in a direction parallel to the rotational axis of the rotating body, and the other has a hole that engages with the protruding portion, and the protruding portion and the hole have a non-circular shape. [Method 1] A method for attaching a physical quantity detection sensor to a rotating body, The aforementioned physical quantity detection sensor is A physical quantity generator that generates physical quantities, A support member that supports the physical quantity generating device and can be connected to a rotating body, A housing that rotatably supports the aforementioned support member, A detection element is provided opposite the physical quantity generating device, It has a cover portion that holds the detection element and covers the housing, The cover portion has a pressing portion that can press the support member in the direction in which it is connected to the rotating body, The above method comprises pressing the pressing portion, wherein the pressing portion presses the cover portion against the support member in the direction, and the support member and the rotating body are connected to each other by press-fitting. [Explanation of Symbols]

[0031] 1. Physical quantity detection sensor 2. Rotating shaft (rotating body) 3. Drive unit 4. Magnets (physical quantity generators) 5. Magnetic field detection element (detection element) 6. Support Member 7 Circuit board (board) 8 Housing 9. Cover section 21 holes 22 Groove 61 Protruding part 62 positioning pins 64 Protrusion 86 Peripheral area 87 Side wall 88 Protrusion 89 Slope 8A Claw part 8B Engagement part 8C Slope 91 Pressing part 93. Buttocks 95 Circumferential groove 96 Inner circumference 97 Outer periphery 98. Hanging piece (elastic part) 99 Aperture 9A Peripheral area 100 Rotating Body Assemblies X Connection direction

Claims

1. A physical quantity generator that generates physical quantities, A support member that supports the physical quantity generating device and can be connected to a rotating body, A physical quantity detection element is provided opposite the physical quantity generating device, A housing that rotatably supports the support member and supports the detection element, It has a cover portion that covers the housing, The rotating body and the support member can be connected to each other by press-fitting. The cover portion has a pressing portion that can press the support member in the direction in which it is connected to the rotating body, The cover portion, when the pressing portion is pressed, presses the support member in the aforementioned direction, connecting the support member with the rotating body. The cover portion has at least one abutment portion that can abut against the support member, and when the pressing portion is pressed, the abutment portion abuts against the support member, pressing the support member in the direction, A physical quantity detection sensor having the detection element and a substrate supported by the housing, wherein a gap is formed between the substrate and the housing, and at least one abutment portion is movable through the gap.

2. The physical quantity detection sensor according to claim 1, wherein the support member has at least one projection that abuts against the abutment portion, and the at least one projection is located between the connection portion between the support member and the rotating body and the substrate.

3. The physical quantity detection sensor according to claim 1, wherein the at least one abutment portion is a plurality of abutment portions, and each of the plurality of abutment portions has substantially the same cross-section as the gap.

4. A physical quantity generating device that generates a physical quantity, A support member that supports the physical quantity generating device and can be connected to a rotating body, A physical quantity detection element is provided opposite the physical quantity generating device, A housing that rotatably supports the support member and supports the detection element, It has a cover portion that covers the housing, The rotating body and the support member can be connected to each other by press-fitting. The cover portion has a pressing portion that can press the support member in the direction in which it is connected to the rotating body, The cover portion, when the pressing portion is pressed, presses the support member in the aforementioned direction, connecting the support member with the rotating body. The housing has a claw portion, A physical quantity detection sensor wherein the cover portion has an opening that can engage with the claw portion, the claw portion has an engaging portion that engages with the peripheral edge of the opening at the front in the direction, and a slope at the rear in the direction on which the cover portion can ride up.

5. A physical quantity generating device for generating a physical quantity, A support member that supports the physical quantity generating device and can be connected to a rotating body, A physical quantity detection element is provided opposite the physical quantity generating device, A housing that rotatably supports the support member and supports the detection element, It has a cover portion that covers the housing, The rotating body and the support member can be connected to each other by press-fitting. The cover portion has a pressing portion that can press the support member in the direction in which it is connected to the rotating body, The cover portion, when the pressing portion is pressed, presses the support member in the aforementioned direction, connecting the support member with the rotating body. A physical quantity detection sensor, wherein the housing has a peripheral edge surrounding the pressing portion, and the pressing portion is a recess surrounded by the peripheral edge.

6. The physical quantity detection sensor according to any one of claims 1 to 5, wherein the cover portion separates from the support member when the pressure of the pressing portion is released.

7. The physical quantity detection sensor according to claim 6, wherein the cover portion has at least one elastic portion that elastically deforms when the pressing portion is pressed in the direction, and the elastic portion generates an elastic restoring force in a direction that separates the cover portion from the support member when the pressing is released.

8. The housing has side walls that encircle the periphery, The cover portion has an inner portion and an outer portion that cooperate to form a circumferential groove that accommodates the side wall, The at least one elastic portion is a plurality of hanging pieces connected to the outer periphery, The physical quantity detection sensor according to claim 7, wherein the plurality of hanging pieces are arranged at intervals along the side wall and extend along the side wall outside the side wall.

9. The housing has a projection with a slope, The physical quantity detection sensor according to claim 8, wherein the hanging piece elastically deforms by riding up onto the slope when the pressing portion is pressed in the direction.

10. The aforementioned physical quantity generating device is a magnet, The detection element is a magnetic field detection element provided opposite the magnet. The physical quantity detection sensor according to claim 1, wherein the physical quantity is magnetic field strength.

11. The physical quantity generating device comprises a light-emitting element and a rotatable code wheel equipped with multiple slits. The detection element is a light-receiving element provided on the opposite side of the light-emitting element with respect to the code wheel. The physical quantity is the intensity of light, according to claim 1, a physical quantity detection sensor.

12. The physical quantity generating device consists of a fixed excitation coil and a rotatable induction coil. The detection element is a fixed receiving coil, The physical quantity is an induced electromotive force, as described in claim 1, for the physical quantity detection sensor.

13. A physical quantity detection sensor according to any one of claims 1 to 5, A rotating body to which the support member is attached, A rotating body assembly having the aforementioned rotating body drive device.

14. The support member has a positioning pin that protrudes outward in a direction perpendicular to the rotational axis of the rotating body. The rotating body assembly according to claim 13, wherein the rotating body has a groove that engages with the positioning pin.

15. The rotating body assembly according to claim 13, wherein one of the support member and the rotating body has a protruding portion that extends in a direction parallel to the rotational axis of the rotating body, and the other has a hole that engages with the protruding portion, and the protruding portion and the hole have a non-circular shape.

16. A method for attaching a physical quantity detection sensor to a rotating body, The aforementioned physical quantity detection sensor is A physical quantity generator that generates physical quantities, A support member that supports the physical quantity generating device and can be connected to a rotating body, A physical quantity detection element is provided opposite the physical quantity generating device, A housing that rotatably supports the support member and supports the detection element, The cover portion that covers the housing, The system comprises a substrate supported by the housing and equipped with the aforementioned detection element, The cover portion has a pressing portion that can press the support member in the direction in which it is connected to the rotating body, and at least one abutting portion that can abut against the support member. A gap is formed between the substrate and the housing. The above method comprises pressing the pressing portion, wherein the pressing portion is pressed, causing the abutting portion to move through the gap and abut against the support member, the cover portion to press the support member in the direction, and the support member and the rotating body to be connected to each other by press-fitting.

17. A physical quantity generating device for generating a physical quantity, A support member that supports the physical quantity generating device and can be connected to a rotating body, A physical quantity detection element is provided opposite the physical quantity generating device, A housing that rotatably supports the support member and supports the detection element, It has a cover portion that covers the housing, The rotating body and the support member can be connected to each other by press-fitting. The cover portion has a pressing portion that can press the support member in the direction in which it is connected to the rotating body, The cover portion, when the pressing portion is pressed, presses the support member in the aforementioned direction, connecting the support member with the rotating body. The aforementioned physical quantity generating device is a magnet, The detection element is a magnetic field detection element provided opposite the magnet. A physical quantity detection sensor in which the aforementioned physical quantity is magnetic field strength.

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