Physical quantity detection sensor and mounting method of the same, and rotor 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 technology]

[0002] Magnetic angle sensors are known for detecting the rotation angle of a rotating body such as a rotating shaft. Patent Document 1 describes a magnetic encoder that combines a magnet and a magnetic field detection element into a unit. The magnetic encoder is attached to a motor shaft via a shaft coupling. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 202643 Summary of the Invention [Problem to be solved by the invention]

[0004] In the magnetic encoder (magnetic angle sensor) described in Patent Document 1, the relative positions of the magnet and the magnetic field detection element are fixed, so that misalignment between them is unlikely to occur during installation. Therefore, the magnetic angle sensor can be calibrated before installation, and the measurement accuracy of the angle sensor is unlikely to decrease. However, because the encoder is attached to the motor shaft via a shaft coupling, the installation structure and method are complicated. This issue 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 unitized physical quantity detection sensor having a simple mounting structure and method. [Means for solving the problem]

[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 is connectable to a rotating body, a housing that rotatably supports the support member, a physical quantity detection element provided opposite the physical quantity generating device, and 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 be pressed in a direction in which the support member is connected to the rotating body, and when the pressing portion is pressed, the cover portion presses the support member in the direction, connecting the support member to the rotating body. Effect of the Invention

[0007] According to the present invention, it is possible to provide a physical quantity detection sensor which is unitized and has a simple mounting structure and method. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of an angle sensor according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an exploded perspective view of the angle sensor shown in FIG. [Diagram 3] 2 is a cross-sectional view of a rotating body assembly including the angle sensor shown in FIG. 1. [Figure 4] 13 is a modified example of a structure for fixing a support member to a rotating shaft. [Diagram 5] FIG. 2 is an exploded perspective view of a housing and a cover portion. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] 10 is a diagram conceptually showing the relationship between the angle of the rotating shaft output by a magnetic field detection unit and the actual angle of the rotating shaft. FIG. [Figure 9] FIG. 13 is an enlarged view of the hanging piece and the protrusion. [Figure 10] FIG. [Figure 11] 1A to 1C are diagrams illustrating a method for attaching an angle sensor to a rotating shaft. [Figure 12] 13A and 13B are diagrams illustrating modified examples of the support member. [Figure 13] FIG. 13 is a perspective view of an angle sensor according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

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

[0011] The angle sensor 1 has a support member 6 that supports a magnet 4. The support member 6 is made of resin or metal. The magnet 4 is cylindrical and is separated into an N pole and an S pole in the radial direction R. The support member 6 can be attached to a rotating shaft 2 that can rotate around a 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 approximately 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. As a result, the support member 6 is attached to the rotating shaft 2 at a predetermined angular position. Although not shown in the figures, 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 a positioning pin 62 and a groove portion 22, but these are not necessary when only the amount of rotation angle needs to be known.

[0012] FIG. 4 shows a modified structure for fixing the support member 6 to the rotating shaft 2. The support member 6 has a protruding portion 63 protruding in the coupling 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 cross-sectional shape and size are substantially equal. The protruding portion 63 is press-fitted into the hole 23. Although not shown in the figure, the rotating shaft 2 may have a protruding portion protruding in the coupling direction X, and the support member 6 may have a hole that engages with the protruding portion. With these structures, the support member 6 can be 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 may be non-circular. The method for fixing the support member 6 to the rotating shaft 2 is not limited to these, and adhesive or screwing on the side of the rotating shaft 2 may also be used.

[0013] As shown in FIG. 3, the magnetic field detection element 5 has a magnetic field detection unit 51 composed of a magnetoresistance effect 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 coupling direction X, and the magnetic field detection unit 51 approximately coincides with the rotation center axis RC of the rotating shaft 2. It is also possible to provide a plurality of magnetic field detection units 51, and in this case, each magnetic field detection unit 51 can be provided at a position shifted in the radial direction R from the rotation center axis RC of the rotating shaft 2. Since the center of the magnet 4 coincides with the rotation center axis RC of the rotating shaft 2, the magnetic flux generated by the magnet 4 rotates around the rotation 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 the support member 6, and a cover portion 9 that covers the housing 8. The cover portion 9 is attached to the housing 8 by a method described later. The housing 8 and the cover portion 9 are made of resin (for example, engineering plastics such as polyphenylene sulfide (PPS) resin and nylon) or metal. FIG. 5 shows an exploded perspective view of the housing 8 and the cover portion 9, FIG. 6 shows a plan view of the housing 8 from the connecting direction X, and FIG. 7 shows a perspective view of the cover portion 9 from an obliquely lower side. The housing 8 has a cylindrical portion 81 that accommodates the support member 6, and a tongue portion 82 that protrudes from the cylindrical portion 81 in the radial direction R. As shown in FIG. 2, a bolt 11 is inserted into a slit 83 of the tongue portion 82, and the bolt 11 is screwed into a screw hole 131 provided in the base member 13, whereby the housing 8 is restrained 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 a generally 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 step portion 85 along the peripheral wall of the cylindrical portion 81. As shown in FIG. 6, the circuit board 7 is generally rectangular, and therefore 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 coupling direction X. A harness 15 is connected to the rear surface of the circuit board 7 opposite to the surface on which the magnetic field detection element 5 is provided, and the harness 15 extends in a direction away from the angle sensor 1 as shown in FIG. 1.

[0016] In this way, the magnetic field detection element 5 is supported by the cover part 9, the magnet 4 is supported by the housing 8 via the bearing 12 and the support member 6, and the cover part 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. In principle, the positional deviation between the magnet 4 and the magnetic field detection element 5, which may occur when the magnet 4 and the magnetic field detection element 5 are attached separately, does not occur. 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 worker can simultaneously attach the magnet 4 and the magnetic field detection element 5 while maintaining their relative positions by simply attaching the angle sensor 1 to the rotating shaft 2. The housing 8, the cover part 9, and the support member 6 are supported only by the rotating shaft 2 in the connection direction X. This simplifies the installation work of the angle sensor 1 and makes it easier to ensure the measurement accuracy.

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

[0018] FIG. 8 conceptually illustrates 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 completely match, and the rotation angle output by the magnetic field detection unit 51 includes 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 performs a correction to adjust the output of the magnetic field detection unit 51 by a value corresponding to 10°. The error of the magnetic field detection unit 51 is measured in advance before the shipment of the angle sensor 1, and the relationship between the output of the magnetic field detection unit 51 and the correction value is obtained and stored in the signal processing unit 52. The relationship between the output of the magnetic field detection unit 51 and the correction value is preferably stored in the form of a table. By calibrating the output of the magnetic field detection unit 51 in advance, the variation in output for each product is suppressed, and calibration after the angle sensor 1 is attached to the rotating shaft 2 is not required.

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

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

[0021] FIG. 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 engagement portion 8B that engages with the peripheral portion 9A of the opening 99 at the front in the connecting direction X, and has a slope 8C at the rear in the connecting direction X. Four claw portions 8A and four openings 99 are provided, 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 portions 8A and the openings 99 are not limited, but in this embodiment, as shown in FIG. 6, the claw portions 8A and the openings 99 are provided at intervals of approximately 90°. As will be described later, the claw portions 8A engage with the openings 99 to prevent the cover portion 9 from coming off the housing 8.

[0022] (How to install angle sensor 1) A method of mounting the angle sensor 1 on a rotating shaft will be described with reference to Figure 11. Figure 9 shows the movement of the cover part 9 and the housing 8 during mounting. 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 parts 9 are aligned. This also aligns the positions of the four claws 8A of the housing 8 and the four openings 99 of the cover part 9.

[0023] When the protruding portion 61 of the angle sensor 1 comes into contact with the hole 21 of the rotating shaft 2, the pressing portion 91 is pressed, as shown in Fig. 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 pressing the pressing portion 91 further, the protruding portion 61 of the support member 6 is press-fitted into the hole 21 of the rotating shaft 2, as shown in Fig. 11(c). In this way, by pressing the support member 6 in the connecting direction X with the cover portion 9, the support member 6 and the rotating shaft 2 are connected to each other by press-fitting.

[0024] The functions of the hanging piece 98 and the protrusion 88 will be described with reference to Fig. 9. Fig. 9 shows an enlarged view of the hanging piece 98 and the protrusion 88. With reference to Fig. 9(a), the hanging piece 98 is located above the protrusion 88 and away from the protrusion 88. When the pressing portion 91 is pressed in the connecting direction X, the hanging piece 98 comes into contact with the protrusion 88 as shown in Fig. 9(b). When the pressing portion 91 is further pressed in the connecting direction X, the hanging piece 98 rides up the slope 89 of the protrusion 88 as shown in Fig. 9(c), and the hanging piece 98 is elastically deformed outward in the radial direction R.

[0025] When the support member 6 is pressed into the rotating shaft 2, the pressing portion 91 is released. The cover portion 9 is released from the support member 6 by the pressing portion 91 being released. When the pressing force is released, the elastic portion 98 generates an elastic restoring force in a direction (opposite to the connecting direction X) that moves the cover portion 9 away from the support member 6. Specifically, a transition from FIG. 9(c) to FIG. 9(b) occurs automatically, and the hanging piece 98 that has been riding on the slope 89 moves upward (opposite to the connecting direction X). FIG. 9(b) corresponds to FIG. 11(d). Therefore, according to this embodiment, the angle sensor 1 can be attached to the rotating shaft 2 without using any jig or tool. In addition, since the cover portion 9 is released 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] The functions of the claw portion 8A and the opening 99 will be described with reference to FIG. 10. As shown in FIG. 10(a), before the pressing portion 91 is pressed in the connecting direction X, the claw portion 8A is accommodated 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, the engagement portion 8B on the lower side of the claw portion 8A is separated from the peripheral portion 9A of the opening 99 when the support member 6 and the rotating shaft 2 are pressed into the support member 6 and the rotating shaft 2. When the pressing of the pressing portion 91 is released, the opening 99 moves upward, but as shown in FIG. 10(b), the peripheral portion 9A of the opening 99 engages with the engagement portion 8B, reducing the possibility that the cover portion 9 will be pulled out of the housing 8. Note that the movement of the cover portion 9 in the connecting direction X is prevented by the hanging piece 98 being restrained by the protrusion 88, so the cover portion 9 is fixed to the housing 8.

[0027] The present invention is not limited to the above embodiment. For example, the elastic portion 98 and the protrusion 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 FIG. 12, the support member 6 may have at least one protrusion 64 that is abutted against the abutment portion 93. In order to avoid interference with the substrate 7, it is preferable that the at least one protrusion 64 is between the connection portion (protrusion portion 61) between the support member 6 and the rotating shaft 2 and the substrate 7. Since the abutment portion 93 is short and it is easy to ensure the strength, it is possible to reduce the cross-sectional area of ​​the abutment portion 93. The number of abutment portions 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.

[0028] The present invention can also be applied to angle sensors other than the magnetic type. Examples of other types of angle sensors include optical angle sensors and electromagnetic induction angle sensors. FIG. 13(a) shows a schematic configuration of an 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 direction of the rotation center axis RC 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 passes alternately between a position facing the slit 106 and between the slits 106. In the former position, the light emitted from the light emitting element 104 passes through the slit 106 and is detected by the light receiving element 105. In the latter position, the light emitted from the light emitting element 104 is not detected by the light receiving element 105. The above principle makes it possible to detect the rotation angle of the rotating body 102. The physical quantity generating device is a light emitting element 104 and a code wheel 103, the detecting element is a light receiving element 105, and the physical quantity is the intensity of light.

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

[0030] (Additional Note) This specification includes the following disclosure. [Configuration 1] A physical quantity generating device that generates a physical quantity; a support member that supports the physical quantity generating device and is connectable to a rotating body; a housing that rotatably supports the support member; A detection element for the physical quantity provided opposite the physical quantity generating device; 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 a direction in which the support member is connected to the rotating body, When the pressing portion is pressed, the cover portion presses the support member in the direction, thereby connecting the support member to the rotating body. [Configuration 2] The physical quantity detection sensor according to configuration 1, wherein the cover portion has at least one abutment portion capable of abutting 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] The physical quantity detection sensor according to configuration 2, further comprising a substrate having the detection element and supported by the cover portion, a gap being formed between the substrate and the housing, and the at least one abutment portion being movable through the gap. [Configuration 4] The physical quantity detection sensor according to configuration 3, wherein the support member has at least one protrusion that abuts against the abutment portion, and the at least one protrusion is located between a connection portion between the support member and the rotating body and the substrate. [Configuration 5] 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, each of the plurality of abutment portions having substantially the same cross section as the gap. [Configuration 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 engagement portion at a front side in the direction that engages with a peripheral portion of the opening. [Configuration 7] 7. The physical quantity detection sensor according to any one of configurations 1 to 6, wherein the housing has a peripheral portion surrounding the pressing portion, and the pressing portion is a recess surrounded by the peripheral portion. [Configuration 8] The physical quantity detection sensor according to any one of configurations 1 to 7, wherein the cover portion moves away from the support member when the pressure of the pressing portion is released. [Configuration 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 moves the cover portion away from the support member when the pressing portion is released. [Configuration 10] The housing has a sidewall that circumferentially surrounds a periphery thereof, the cover portion has an inner circumferential portion and an outer circumferential portion that cooperate to define a circumferential groove that accommodates the side wall; The at least one elastic portion is a plurality of flap pieces connected to the outer periphery, 10. The physical quantity detection sensor according to configuration 9, wherein the plurality of hanging pieces are spaced apart along the side wall and extend outside the side wall along the side wall. [Configuration 11] The housing has a protrusion with a slope, 11. The physical quantity detection sensor according to configuration 10, wherein the hanging piece is elastically deformed by climbing up the slope when the pressing portion is pressed in the direction. [Configuration 12] the physical quantity generating device is a magnet, the detection element is a magnetic field detection element provided opposite the magnet, 12. The physical quantity detection sensor according to any one of configurations 1 to 11, wherein the physical quantity is a magnetic field intensity. [Configuration 13] the physical quantity generating device is a light emitting element and a rotatable code wheel having a plurality of slits; the detection element is a light receiving element provided on an opposite side of the light emitting element with respect to the code wheel, 12. The physical quantity detection sensor according to any one of configurations 1 to 11, wherein the physical quantity is light intensity. [Configuration 14] The physical quantity generating device is a fixed excitation coil and a rotatable induction coil, the sensing element is a fixed receive coil; 12. The physical quantity detection sensor according to any one of configurations 1 to 11, wherein the physical quantity is an induced electromotive force. [Configuration 15] A physical quantity detection sensor according to any one of configurations 1 to 14, A rotating body to which the support member is attached; and A rotating body assembly having a driving device for the rotating body. [Configuration 16] the support member has a positioning pin protruding outward in a direction perpendicular to the central axis of rotation of the rotating body, 16. The rotating body assembly of claim 15, wherein the rotating body has a groove that engages with the positioning pin. [Configuration 17] The rotating body assembly of configuration 15, wherein one of the support member and the rotating body has a protrusion protruding in a direction parallel to the central axis of rotation of the rotating body, and the other has a hole that engages with the protrusion, and the protrusion and the hole have a non-circular shape. [Method 1] A method for mounting a physical quantity detection sensor to a rotating body, comprising the steps of: The physical quantity detection sensor includes: A physical quantity generating device that generates a physical quantity; a support member that supports the physical quantity generating device and is connectable to a rotating body; a housing that rotatably supports the support member; A detection element provided opposite the physical quantity generating device; 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 a direction in which the support member is connected to the rotating body, The method includes pressing the pressing portion, and pressing the pressing portion causes the cover portion to press the support member in the direction, so that 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 Supporting member 7 Circuit Board (Substrate) 8. Housing 9 Cover part 21 holes 22 Groove 61 Protruding part 62 Locating pin 64 Protrusion 86 Periphery 87 Side wall 88 Protrusion 89 Slope 8A Claw part 8B Engagement part 8C Slope 91 Pressing part 93 Stopping part 95 Circumferential Groove 96 Inner circumference 97 Outer periphery 98 Drop piece (elastic part) 99 Aperture 9A Periphery 100 Rotating body assembly X Connection direction

Claims

1. A physical quantity generating device that generates a physical quantity; a support member that supports the physical quantity generating device and is connectable to a rotating body; a housing that rotatably supports the support member; A detection element for the physical quantity provided opposite the physical quantity generating device; 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 a direction in which the support member is connected to the rotating body, When the pressing portion is pressed, the cover portion presses the support member in the direction, thereby connecting the support member to the rotating body.

2. The physical quantity detection sensor according to claim 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.

3. 3. The physical quantity detection sensor according to claim 2, further comprising a substrate having the detection element and supported by the cover portion, a gap being formed between the substrate and the housing, and the at least one abutment portion being movable through the gap.

4. 4. The physical quantity detection sensor according to claim 3, wherein the support member has at least one protrusion that abuts against the abutment portion, and the at least one protrusion is between a connection portion between the support member and the rotating body and the substrate.

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

6. The housing has a claw portion, 2. The physical quantity detection sensor according to claim 1, wherein the cover portion has an opening that can engage with the claw portion, and the claw portion has an engagement portion at a front side in the direction that engages with a peripheral portion of the opening, and a slope at a rear side in the direction on which the cover portion can ride up.

7. The physical quantity detection sensor according to claim 1 , wherein the housing has a peripheral portion surrounding the pressing portion, and the pressing portion is a recess surrounded by the peripheral portion.

8. The physical quantity detection sensor according to claim 1 , wherein the cover portion moves away from the support member when the pressing portion is released from the pressing portion.

9. 9. The physical quantity detection sensor according to claim 8, wherein the cover portion has at least one elastic portion that elastically deforms when the pressing portion is pressed in the said direction, and the elastic portion generates an elastic restoring force in a direction that moves the cover portion away from the support member when the pressing portion is released.

10. The housing has a sidewall that circumferentially surrounds a periphery thereof, the cover portion has an inner circumferential portion and an outer circumferential portion that cooperate to define a circumferential groove that accommodates the side wall; The at least one elastic portion is a plurality of flap pieces connected to the outer periphery, The physical quantity detection sensor according to claim 9 , wherein the plurality of flap pieces are spaced apart along the side wall and extend outside the side wall along the side wall.

11. The housing has a protrusion with a slope, The physical quantity detection sensor according to claim 10 , wherein the hanging piece is elastically deformed by climbing up the slope when the pressing portion is pressed in the direction.

12. the 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 a magnetic field intensity.

13. the physical quantity generating device is a light emitting element and a rotatable code wheel having a plurality of slits; the detection element is a light receiving element provided on an opposite side of the light emitting element with respect to the code wheel, The physical quantity detection sensor according to claim 1 , wherein the physical quantity is a light intensity.

14. The physical quantity generating device is a fixed excitation coil and a rotatable induction coil, the sensing element is a fixed receiving coil; The physical quantity detection sensor according to claim 1 , wherein the physical quantity is an induced electromotive force.

15. A physical quantity detection sensor according to claim 1 , A rotating body to which the support member is attached; and A rotating body assembly having a driving device for the rotating body.

16. the support member has a positioning pin protruding outward in a direction perpendicular to the central axis of rotation of the rotating body, The rotor assembly of claim 12 , wherein the rotor has a groove that engages with the locating pin.

17. 13. The rotating body assembly according to claim 12, wherein one of the support member and the rotating body has a protrusion protruding in a direction parallel to the central axis of rotation of the rotating body, and the other has a hole engaging with the protrusion, and the protrusion and the hole have a non-circular shape.

18. A method for mounting a physical quantity detection sensor to a rotating body, comprising the steps of: The physical quantity detection sensor includes: A physical quantity generating device that generates a physical quantity; a support member that supports the physical quantity generating device and is connectable to a rotating body; a housing that rotatably supports the support member; A detection element for the physical quantity provided opposite the physical quantity generating device; 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 a direction in which the support member is connected to the rotating body, The method includes pressing the pressing portion, and pressing the pressing portion causes the cover portion to press the support member in the direction, so that the support member and the rotating body are connected to each other by press fitting.

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