JP6238299B2 - Rotation angle detector - Google Patents

Description

  The present invention relates to a rotation angle detection device suitable for detecting the rotation angle of a rotation shaft to be detected.

  This type of rotation angle detection device is attached to a steering-side rotation shaft that rotates in accordance with a driver's steering operation, and is used for detecting the rotation angle of the attached rotation shaft. In recent years, with the spread of a steering control method called a steer-by-wire method, a rotation angle detection device is attached not only to a rotation shaft on the steering side but also to a rotation shaft on the motor side outside the passenger compartment. And when attaching outside a vehicle compartment, ensuring the waterproofness of a rotation angle detection apparatus becomes important.

  For example, Patent Literature 1 is disclosed as a technique related to a conventional rotation angle detection device that can handle such applications. FIG. 13 is an explanatory diagram showing a configuration of a conventional rotation angle detection device, and shows a configuration of a rotary encoder 320 (rotation angle detection device) according to Patent Document 1. As shown in FIG.

  As shown in FIG. 13, the rotary encoder 320 includes an encoder shaft 320a (rotor) coupled to the shaft 301 (rotary shaft) of the electric motor, a code wheel 320b screwed to the encoder shaft 320a, and a code wheel 320b. Encoder module 320c having a built-in optocoupler, encoder board 320d on which a circuit for processing an output signal of encoder module 320c is formed, encoder cover 320e covering one side of encoder board 320d, encoder board 320d, and encoder cover Encoder base 320g for fixing 320e.

  An engagement pin hole 320a3 is formed at a predetermined position of the encoder shaft 320a. When the engagement pin 301b on the shaft 301 side is engaged with the engagement pin hole 320a3, the shaft 301 and the encoder shaft are engaged. 320a is rotated in conjunction with it. The encoder shaft 320a is rotatably attached to the encoder base 320g using an encoder bearing 320h. The rotary encoder 320 detects the rotation angle of the encoder shaft 320a connected to the shaft 301 by using a code wheel 320b, an encoder module 320c, and a circuit formed on the encoder board 320d.

  A shaft hole 320e1 larger than the encoder shaft 320a is formed in the encoder cover 320e, and is used for alignment between the engagement pin 301b on the shaft 301 side and the engagement pin hole 320a3 on the encoder shaft 320a side. . Then, after the encoder shaft 320a is engaged with the shaft 301 side, the end cap 320j is press-fitted and fixed in the shaft center hole 320e1. The rotary encoder 320 prevents moisture from entering from the encoder cover 320e side by press-fitting and fixing the end cap 320j to the shaft hole 320e1.

JP 7-312849 A

  In the rotary encoder 320 according to Patent Document 1, an axial hole 320e1 is formed in the encoder cover 320e in order to align the engagement pin 301b of the shaft 301 and the engagement pin hole 320a3 of the encoder shaft 320a. Yes. As described above, there is a concern that the waterproof property is deteriorated by forming the hole such as the axial hole 320e1 in the encoder cover 320e.

  In the rotary encoder 320 according to Patent Document 1, moisture is prevented from entering from the encoder cover 320e side by press-fitting and fixing the end cap 320j into the shaft hole 320e1, but in such a method, the end cap 320 A member such as 320j is required, leading to an increase in the number of parts.

  The present invention has been made in view of the situation of the prior art as described above, and an object thereof is to make it possible to engage the rotor and the rotating shaft while suppressing an increase in the number of components, and to easily ensure waterproofness. An object of the present invention is to provide a rotation angle detection device.

  In order to solve this problem, the rotation angle detection device according to claim 1 rotates to a cover for ensuring sealing after being attached to the rotation shaft to be detected and an engaged portion of the rotation shaft. In a rotation angle detection device comprising: a rotor having an engagement piece portion engageable as a stop; and a detection means for detecting a rotation operation of the rotor. When the rotor is engaged with a rotation shaft, A guide piece for guiding the engagement piece to the engaged portion of the rotation shaft is provided, and the guide piece protrudes more than the engagement piece on the direction of engagement with the rotation shaft. It is characterized by that.

  In the rotation angle detection device having this configuration, the engagement piece portion on the rotation angle detection device side can be guided to a position corresponding to the engaged portion on the rotation shaft side using the guide piece portion. Positioning with the engaged portion is facilitated. And do not form a hole in the cover to align the engagement piece part and the engaged part, and do not block the hole formed in the cover with a lid member to ensure waterproofness Even better. As a result, in the rotation angle detection device having this configuration, it is possible to engage the rotor and the rotation shaft while suppressing an increase in the number of parts, and to easily ensure waterproofness.

  The rotation angle detection device according to claim 2, further comprising a base plate that forms a space for arranging the rotor and the detection means between the cover and the cover, and the guide piece portion is located at an arrangement position of the base plate. Is also extended in the direction of engagement with the rotating shaft.

  In the rotation angle detection device having this configuration, the position of the guide piece portion can be confirmed from the direction of engagement with the rotation shaft. As a result, alignment between the guide piece on the rotation angle detection device side and the guide groove on the rotation shaft side is facilitated, and the reliability when the rotor is attached to the rotation shaft can be enhanced.

  The rotation angle detection device according to a third aspect is characterized in that the guide piece portion is formed continuously from a part of the engagement piece portion.

  In the rotation angle detection device having this configuration, the engagement piece portion and the guide piece portion can be formed integrally, thereby reducing the number of members attached to the rotor. In addition, space can be saved by reducing the number of members attached to the rotor, and thereby the rotation angle detection device can be reduced in size.

  The rotation angle detection device according to claim 4, wherein the guide piece portion has a spring property, and a distal end side of the guide piece portion is inclined toward the axial center direction of the rotation shaft. And

  In the rotation angle detecting device having this configuration, the guide piece is guided to the guide groove portion by utilizing the inclination on the tip side together with the spring property, so that the rotor rotates with the rotor even if the guide piece portion is slightly displaced in the axial direction or the opposite direction. The deviation from the axis can be easily corrected. As a result, the alignment between the engaging piece portion on the rotation angle detecting device side and the engaging groove portion on the rotating shaft side is facilitated, and the reliability when the rotor is attached to the rotating shaft can be further enhanced.

  According to a fifth aspect of the present invention, there is provided the rotation angle detecting device including a restricting portion that restricts movement of the rotor in the axial direction.

  In the rotation angle detection device having this configuration, the restricting portion restricts the movement of the rotor in the axial direction. Therefore, even if a force is applied to the rotor along the axial direction, the rotor moves toward the cover side and Contact can be suppressed. As a result, the load applied to the rotor by contact between the rotor and the cover can be suppressed, and the rotor can be smoothly rotated.

  ADVANTAGE OF THE INVENTION According to this invention, the rotation angle detection apparatus which can engage a rotor and a rotating shaft, and is easy to ensure waterproofness can be provided, suppressing the increase in a number of parts.

It is explanatory drawing which shows the external appearance of the rotation angle detection apparatus which concerns on 1st Embodiment of this invention. It is the 1st explanatory view showing the composition of the rotation angle detection device concerning a 1st embodiment of the present invention. It is the 2nd explanatory view showing the composition of the rotation angle detecting device concerning a 1st embodiment of the present invention. It is explanatory drawing which shows the example of attachment of the rotation angle detection apparatus which concerns on 1st Embodiment of this invention. It is explanatory drawing in the planar view of the rotor of the rotation angle detection apparatus which concerns on 1st Embodiment of this invention, and a rotation angle detection apparatus. It is explanatory drawing which shows the attachment relationship of the rotor and rotating shaft of the rotation angle detection apparatus which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the cross-section of the rotation angle detection apparatus which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the attachment relationship of the rotation angle detection apparatus which concerns on 1st Embodiment of this invention, and a rotating shaft. It is the 1st explanatory view showing the attachment relation of the rotor and rotating shaft of the rotation angle detecting device concerning a 2nd embodiment of the present invention. It is the 2nd explanatory view showing attachment relation between a rotor and a rotating shaft of a rotation angle detecting device concerning a 2nd embodiment of the present invention. It is explanatory drawing which shows the attachment relationship of the rotation angle detection apparatus which concerns on 2nd Embodiment of this invention, and a rotating shaft. It is explanatory drawing which shows the attachment relationship of the rotation angle detection apparatus which concerns on 3rd Embodiment of this invention, and a rotating shaft. It is explanatory drawing which shows the structure of the conventional rotation angle detection apparatus.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In each figure, the description will be made with the X1 direction as the left, the X2 direction as the right, the Y1 direction as the front, the Y2 direction as the rear, the Z1 direction as the upper, and the Z2 direction as the lower.

  First, the configuration of the rotation angle detection device 1 according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory diagram showing the appearance of the rotation angle detection device according to the first embodiment of the present invention. FIG. 1A is a perspective view when the rotation angle detection device 1 is viewed from obliquely above, and FIG. 1B is a perspective view when the rotation angle detection device 1 is viewed from obliquely below. FIG. 2 is a first explanatory view showing the configuration of the rotation angle detection device according to the first embodiment of the present invention, and is an exploded perspective view when the rotation angle detection device 1 is viewed obliquely from above. FIG. 3 is a second explanatory view showing the configuration of the rotation angle detection device according to the first embodiment of the present invention, and is an exploded perspective view when the rotation angle detection device 1 is viewed obliquely from below. FIG. 4 is an explanatory diagram showing an example of attachment of the rotation angle detection device according to the first embodiment of the present invention.

  FIG. 5 is an explanatory diagram in a plan view of the rotation angle detection device and the rotor of the rotation angle detection device according to the first embodiment of the present invention. FIG. 5A is a plan view seen from above the rotation angle detection device 1, and FIG. 5B is a plan view seen from above the rotor 20. FIG. 6 is an explanatory view showing a mounting relationship between the rotor and the rotation shaft of the rotation angle detection device according to the first embodiment of the present invention, and a cross section corresponding to the line VI-VI shown in FIG. The structure of the rotor 20 and the rotating shaft 60 is shown schematically. In FIG. 6, the hatching of the cross section is omitted. FIG. 7 is an explanatory diagram showing a cross-sectional structure of the rotation angle detection device according to the first embodiment of the present invention, and schematically shows a cross-sectional structure of the rotation angle detection device 1 corresponding to the VII-VII line shown in FIG. Show. In FIG. 7, the waterproof cover 10 and the rotation angle detection means 40 are simplified and the connector 50 is omitted in order to make the structure of the part related to the present invention easy to understand.

  As shown in FIGS. 1 to 3, the rotation angle detection device 1 includes a waterproof cover 10, a rotor 20, a base plate 30, a rotation angle detection means 40, and a connector 50. As shown in FIG. 4, the rotation angle detection device 1 is attached to a rotation shaft 60 to be detected such as a rotation shaft on the motor side outside a vehicle compartment of the vehicle, and is driven by a driver's steering operation or the like. The rotation angle of the rotation shaft 60 is detected.

  In the present embodiment, for the sake of convenience, the description will be given assuming that the rotating shaft 60 rotates around the axis L1 extending in the vertical direction. The extending direction (vertical direction) of the axis L1 is the axial direction, the direction toward the axis L1 is the axis direction, the direction away from the axis L1 is the outer peripheral direction, and the direction of rotation about the axis L1 is the center direction. The description will proceed as the direction of rotation.

  The waterproof cover 10 is a member for ensuring hermeticity after the rotation angle detection device 1 is attached to the rotation shaft 60, and is made of, for example, a synthetic resin. As shown in FIGS. 2 and 3, the waterproof cover 10 has a substantially rectangular outer shape. Further, the waterproof cover 10 has a housing portion 11 for housing the rotor 20, the base plate 30, and the rotation angle detection means 40.

  The accommodating portion 11 is a substantially circular recess having a circular opening 12 on the lower end side of the waterproof cover 10 and recessed upward from the lower end side of the waterproof cover 10. The waterproof cover 10 accommodates the rotor 20, the base plate 30, and the rotation angle detection means 40 in the accommodating portion 11, and covers the outer periphery and the upper portion of the accommodated member without gaps.

  Further, at a predetermined position on the outer peripheral portion of the waterproof cover 10, a screwing portion 13 is formed for screwing to a member disposed on the lower side after engaging with the rotary shaft 60.

  The rotor 20 is a member that rotates in conjunction with the rotation shaft 60 after being attached to the rotation shaft 60, and is made of, for example, a synthetic resin. As shown in FIGS. 2 and 3, the rotor 20 is a cylindrical member extending in the vertical direction. As shown in FIG. 6, the rotor 20 includes an engagement piece portion 21 and a guide piece portion 22.

  The engaging piece portion 21 is a member for engaging the rotor 20 and the rotating shaft 60 as a rotation stopper, and is made of, for example, a metal material. The engagement piece portion 21 has a plate shape extending in the vertical direction, and extends downward from the vicinity of the upper end portion on the inner peripheral side of the rotor 20. Such an engaging piece portion 21 is formed as a separate member from the rotor 20 and then attached to the rotor 20. However, the engaging piece portion 21 may be formed integrally with the rotor 20 using a method such as injection molding.

  The guide piece portion 22 is a member for guiding the engagement piece portion 21 to a predetermined position, and is made of, for example, a metal material. As shown in FIG. 6, the guide piece portion 22 has a shape in which two plate-like portions are connected up and down in a stepped manner via an intermediate portion 22 c. Of the two plate-like portions, the first plate-like portion 22a that is the plate-like portion on the upper end side is disposed closer to the outer peripheral direction, and the second plate-like portion 22b that is the plate-like portion on the lower end side is the axial direction. It is arranged closer. The first plate-like portion 22 a extends downward from the vicinity of the upper end portion on the inner peripheral side of the rotor 20. The second plate-like portion 22b extends along a direction inclined toward the axial center side of the rotation shaft 60 from below. The intermediate portion 22c is connected to the lower end portion of the first plate-like portion 22a and the upper end portion of the second plate-like portion 22b, and the lower end portion of the second plate-like portion 22b is the lower end portion 22d of the guide piece portion 22. It has become.

  The length of the guide piece portion 22 in the vertical direction is longer than that of the engagement piece portion 21, and the lower end portion 22 d of the guide piece portion 22 projects downward from the engagement piece portion 21. Moreover, the guide piece part 22 has springiness, and the lower end part 22d of the guide piece part 22 is elastically deformed in the axial direction side. Such a guide piece 22 is formed as a separate member from the rotor 20 and then attached to the rotor 20. However, the guide piece 22 may be formed integrally with the rotor 20 using a method such as injection molding.

  The base plate 30 is a disk-shaped member made of, for example, a synthetic resin, and has an upper surface and a lower surface as shown in FIGS. As shown in FIG. 7, the base plate 30 is fitted into the opening 12 of the waterproof cover 10. In the space surrounded by the inner wall of the housing portion 11 of the waterproof cover 10 and the upper surface of the base plate 30, the rotor 20 and the rotation angle detection means 40 are arranged.

  As shown in FIG. 2, an annular rotor convex portion 31 that is convex upward is formed on the upper surface side of the base plate 30. As shown in FIG. 7, the lower end portion of the rotor 20 is accommodated in the portion surrounded by the rotor convex portion 31, and the rotor is sandwiched between the upper surface of the base plate 30 and the ceiling surface of the waterproof cover 10. 20 is rotatably held.

  In addition, a circular through hole 32 is formed in the center portion of the base plate 30 as shown in FIGS. Further, the base plate 30 is disposed such that the lower surface thereof is positioned above the lower end portion 22 d of the guide piece portion 22. Then, as shown in FIG. 7, the guide piece portion 22 extends through the through hole 32 of the base plate 30 to the engagement direction side of the rotating shaft 60 from the lower surface of the base plate 30, that is, to the lower side of the base plate 30. ing.

  In the present embodiment, the outer diameter of the upper end portion of the rotation shaft 60 to which the rotation angle detection device 1 is attached is smaller than the inner diameter of the through hole 32 of the base plate 30 and is substantially the same as the inner diameter of the rotor 20. . When the rotation angle detection device 1 is attached to the rotation shaft 60, the upper end portion of the rotation shaft 60 penetrates the through hole 32 and protrudes above the base plate 30, and the upper end portion of the rotation shaft 60 is the upper portion of the rotor 20. It fits into the lower end.

  Further, as shown in FIG. 6, a mounting recessed portion 64 that is recessed downward is formed at the upper end portion of the rotating shaft 60, and corresponds to the engagement piece portion 21 on the inner peripheral portion of the mounting recessed portion 64. An engaging groove 61 (engaged portion) is formed at the position. When the rotation angle detection device 1 is attached to the rotation shaft 60, the engagement piece portion 21 on the rotation angle detection device 1 side is engaged with the engagement groove portion 61 on the rotation shaft 60 side. As a result, the rotor 20 is engaged with the rotating shaft 60 and rotates in conjunction with the rotating shaft 60.

  Further, as shown in FIG. 6, a guide groove 62 is formed at a position corresponding to the guide piece 22 on the inner peripheral portion of the mounting recess 64. As described above, the guide piece portion 22 has a spring property, and the second plate-like portion 22b on the lower end side of the guide piece portion 22 is inclined toward the axial center direction of the rotation shaft 60. Yes. Therefore, even if the guide piece portion 22 is slightly displaced in the axial direction or the outer circumferential direction, the displacement between the rotor 20 and the rotary shaft 60 can be easily corrected by utilizing the spring property of the guide piece portion 22. it can.

  As shown in FIGS. 2 and 3, the rotation angle detection means 40 includes a main driving gear 41, two driven gears 42, and a wiring board 43. As shown in FIG. 6, the main drive gear 41 is arranged in two rows on the outer peripheral side of the rotor 20 so that the number of teeth is different. Each of the two driven gears 42 is disposed so as to mesh with each row of the main driving gears 41 and is rotatably attached to the ceiling surface side of the waterproof cover 10 by a holding mechanism (not shown). A magnet (not shown) is attached to each driven gear 42.

  The wiring board 43 is disposed on the upper surface side of the base plate 30 so as to be positioned below the two driven gears 42. Magnetic sensors (not shown) are mounted at predetermined positions on the wiring board 43 so as to face the magnets of the driven gear 42. In addition, an electronic component (not shown) is mounted on the wiring board 43 to constitute a detection circuit for detecting the rotation angle.

  In the rotation angle detection device 1, the rotor 20 rotates in conjunction with the rotation shaft 60, and the rotation angle detection means 40 includes a magnet and a wiring board attached to the two driven gears 42 that rotate according to the rotor 20. The rotation angle of the rotor 20 is detected by using the magnetic sensor mounted on 43. In addition, since the detection method of such a rotation angle is a well-known method, detailed description is abbreviate | omitted.

  The connector 50 is for connecting the above-described detection circuit to an external circuit (not shown). As shown in FIG. 1, the connector 50 is integrally formed with the waterproof cover 10 at a predetermined position on the outer periphery of the waterproof cover 10. The connector 50 is embedded with a connection terminal (not shown) for connecting the detection circuit and an external circuit.

  Next, a method of attaching the rotation angle detection device 1 to the rotation shaft 60 will be described with reference to FIG. FIG. 8 is an explanatory diagram showing the mounting relationship between the rotation angle detection device and the rotation shaft according to the first embodiment of the present invention, and the rotation angle detection device 1 and the rotation shaft corresponding to the VII-VII line shown in FIG. The cross-sectional structure with 60 is typically shown. FIG. 8A shows a state before the rotation angle detection device 1 is attached to the rotation shaft 60, and FIG. 8B shows a state when the rotation angle detection device 1 is attached to the rotation shaft 60. ing.

  When the rotation angle detection device 1 is attached to the rotation shaft 60, first, as shown in FIG. 8, the rotation angle detection device 1 is moved closer to the upper end portion of the rotation shaft 60 from above. The approximate position of the rotation angle detection device 1 is such that the guide piece 22 on the rotation angle detection device 1 side corresponds to the guide groove portion 62 on the rotation shaft 60 side, that is, above the guide groove portion 62. Align.

  Next, the rotation angle detection device 1 is slowly pushed downward, whereby the lower end portion 22 d of the guide piece portion 22 and the second plate-like portion 22 b on the lower end portion side are inserted into the guide groove portion 62 of the rotation shaft 60. Then, the upper end portion of the rotating shaft 60 passes through the through hole 32 of the base plate 30 and protrudes above the base plate 30, and the upper end portion of the rotating shaft 60 is fitted into the lower end portion of the rotor 20.

  When the upper end portion of the rotating shaft 60 is fitted into the lower end portion of the rotor 20, the lower end portion 22 d of the guide piece portion 22 on the rotation angle detecting device 1 side is guided by the guide groove portion 62 on the rotating shaft 60 side and the rotor 20. The position with respect to the rotation direction is corrected. Then, the lower end portion 22d of the guide piece 22 enters the axial direction side with the engagement, and accordingly, the engagement piece portion 21 on the rotation angle detecting device 1 side is for engagement on the rotation shaft 60 side. It is guided to a position corresponding to the groove 61, that is, above the engaging groove 61.

  Next, the rotation angle detecting device 1 is further slowly pushed downward, and the lower end portion of the waterproof cover 10 is fitted into the case member 70 on the rotating shaft 60 side. Accordingly, the engaging piece portion 21 on the rotation angle detecting device 1 side is engaged with the engaging groove portion 61 on the rotating shaft 60 side, and the first plate-like portion 22a of the guide piece portion 22 becomes the guiding groove portion 62. Engaged. As a result, the rotor 20 is engaged with the rotating shaft 60 and rotates in conjunction with the rotating shaft 60.

  Although not shown, the rotation angle detection device 1 is fixed to the case member 70 by screwing the screwing portion 13 of the waterproof cover 10 to a predetermined position of the case member 70. Although not shown, the gap between the lower end portion of the waterproof cover 10 and the case member 70 is closed using a member such as packing, thereby ensuring the sealing of the rotation angle detection device 1. The rotation angle detection device 1 is attached to the rotation shaft 60 in this way.

  Next, the effect of this embodiment will be described. In the rotation angle detection device 1 of the present embodiment, when the rotor 20 is engaged with the rotation shaft 60, the engagement piece portion 21 on the rotation angle detection device 1 side is connected to the engagement groove portion on the rotation shaft 60 side. A lower end portion 22 d of the guide piece portion 22 for guiding to 61 (engaged portion) is provided to protrude from the engagement piece portion 21 on the engagement direction side (downward side) with respect to the rotating shaft 60. Therefore, the engaging piece portion 21 on the rotation angle detecting device 1 side can be guided to the position corresponding to the engaging groove portion 61 on the rotating shaft 60 side (above the engaging groove portion 61) using the guide piece portion 22. Alignment between the engaging piece 21 and the engaging groove 61 is facilitated. And the hole formed in the waterproof cover 10 in order to align the engagement piece part 21 and the groove part 61 for engagement, or the hole formed in the waterproof cover 10 with the member for a lid | cover in order to ensure waterproofness You don't have to block it. As a result, in the rotation angle detection device 1, it is possible to engage the rotor 20 and the rotary shaft 60 while suppressing an increase in the number of parts, and to easily ensure waterproofness.

  Further, in the rotation angle detection device 1 of the present embodiment, the guide piece 22 extends from the position where the base plate 30 is disposed in the direction of engagement with the rotation shaft 60, that is, the lower side of the base plate 30. Therefore, the position of the guide piece 22 can be confirmed from the lower side of the base plate 30. As a result, alignment between the lower end 22d of the guide piece 22 on the rotation angle detecting device 1 side and the guide groove 62 on the rotating shaft 60 side becomes easy, and the reliability when the rotor 20 is attached to the rotating shaft 60 is improved. Can be increased.

  Further, in the rotation angle detection device 1 of the present embodiment, the guide piece portion 22 has a spring property, and the second plate-like portion 22 b on the lower end side of the guide piece portion 22 is the axis of the rotation shaft 60. Inclined in the direction. Therefore, even if the guide piece portion 22 is slightly displaced in the axial direction or the outer peripheral direction, the inclination of the second plate-like portion 22b is utilized together with the spring property of the guide piece portion 22 to provide a space between the rotor 20 and the rotary shaft 60. The deviation can be easily corrected. As a result, the positioning of the engaging piece 21 on the rotation angle detecting device 1 side and the engaging groove 61 on the rotating shaft 60 side becomes easier, and the reliability when the rotor 20 is attached to the rotating shaft 60 is further improved. be able to.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. In addition, in this embodiment, when it is the same structure as 1st Embodiment mentioned above, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  First, the configuration of the rotation angle detection device 101 according to the second embodiment of the present invention will be described with reference to FIGS. FIG. 9 is a first explanatory view showing the attachment relationship between the rotor and the rotation shaft of the rotation angle detection device according to the second embodiment of the present invention, and the rotor 120 and the rotation corresponding to the cross-sectional position similar to FIG. A cross-sectional structure with the shaft 160 is schematically shown. In FIG. 9, the hatching of the cross section is omitted.

  FIG. 10 is a second explanatory diagram showing the attachment relationship between the rotor and the rotation shaft of the rotation angle detection device according to the second embodiment of the present invention, and the relationship between the engagement piece 121 of the rotor 120 and the rotation shaft 160. An engagement portion with the combined groove portion 161 is schematically shown in an enlarged manner. FIG. 10A shows a state before the engaging piece 121 is engaged with the engaging groove 161, and FIG. 10B shows that the engaging piece 121 is engaged with the engaging groove 161. It shows the state of the hour.

  FIG. 11 is an explanatory diagram showing the mounting relationship between the rotation angle detection device and the rotation shaft according to the second embodiment of the present invention, and the rotation angle detection device 101 and the rotation shaft 160 corresponding to the cross-sectional position similar to FIG. The cross-sectional structure is shown schematically. FIG. 11A shows a state before the rotation angle detection device 101 is attached to the rotation shaft 160, and FIG. 11B shows a state when the rotation angle detection device 101 is attached to the rotation shaft 160. ing.

  As shown in FIG. 9, the rotation angle detection device 101 is obtained by replacing the rotor 20 of the rotation angle detection device 1 according to the first embodiment with a rotor 120. As shown in FIG. 10, the rotor 120 has an engagement piece portion 121 and a guide piece portion 122.

  Similar to the engagement piece portion 21 of the first embodiment, the engagement piece portion 121 has a plate-like outer shape extending in the vertical direction. However, in the present embodiment, as shown in FIG. 11, a truncated cone-shaped restricting convex portion 123 (a restricting portion) is formed at a predetermined position on the outer peripheral direction side of the engaging piece portion 121. The structure of the guide piece portion 122 is the same as the structure of the guide piece portion 22 of the first embodiment.

  The axial direction of the rotating shaft 160 to which the rotor 120 is attached is the same as the rotating shaft 60 of the first embodiment. In addition, a mounting recess 164 is formed at the upper end of the rotating shaft 160, similarly to the rotating shaft 60. And as shown in FIG. 10, the groove part 161 for engagement (engaged part) is formed in the position corresponding to the engagement piece part 121 of the inner peripheral part of the recessed part 164 for attachment. A guide groove 162 is formed at a position corresponding to the guide piece 122 on the inner periphery of the mounting recess 164. Further, as shown in FIG. 11, a restricting recess 163 into which the restricting convex portion 123 is fitted is formed at a position corresponding to the restricting convex portion 123 of the engaging groove 161.

  In this embodiment, when the rotation angle detection device 101 is attached to the rotation shaft 160, first, the lower end portion of the guide piece 122 is inserted into the engagement groove 161, and then the rotation angle detection device 101 is pushed downward. Thus, the engaging piece 121 is guided to a position corresponding to the engaging groove 161. Then, by further pushing the rotation angle detection device 101 downward, the engagement piece 121 is engaged with the engagement groove 161, and thereby the rotor 120 is engaged with the rotation shaft 160.

  In this embodiment, when the engagement piece 121 on the rotation angle detection device 101 side is engaged with the engagement groove 161 on the rotation shaft 160 side, the regulating convex portion 123 on the rotation angle detection device 101 side rotates. By fitting into the restriction recess 163 on the shaft 160 side, the movement of the rotor 120 in the axial direction (vertical direction) is restricted.

  Next, the effect of this embodiment will be described. In the rotation angle detection device 101 of the present embodiment, since the restricting convex portion 123 (the restricting portion) restricts the movement of the rotor 120 in the axial direction (vertical direction), a force is applied to the rotor 120 along the axial direction. Even if added, the rotor 120 can be prevented from moving to the ceiling surface side of the waterproof cover 10 and coming into contact with the waterproof cover 10. As a result, the load applied to the rotor 120 due to the contact between the rotor 120 and the waterproof cover 10 can be suppressed, and the rotor 120 can be smoothly rotated.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. In addition, in this embodiment, when it is the same structure as 1st Embodiment mentioned above, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  First, the configuration of the rotation angle detection device 201 according to the third embodiment of the present invention will be described with reference to FIG. FIG. 12 is an explanatory diagram showing the mounting relationship between the rotation angle detection device and the rotation shaft according to the third embodiment of the present invention, and the rotation angle detection device 201 and the rotation shaft 260 corresponding to the cross-sectional position similar to FIG. The cross-sectional structure is shown schematically. 12A shows a state before the rotation angle detection device 201 is attached to the rotation shaft 260, and FIG. 12B shows a state when the rotation angle detection device 201 is attached to the rotation shaft 260. ing.

  As shown in FIG. 12, the rotation angle detection device 201 is obtained by replacing the rotor 20 of the rotation angle detection device 1 according to the first embodiment with a rotor 220. The rotor 220 has an engagement piece portion 221 and a guide piece portion 222.

  However, in this embodiment, there is no member corresponding to the engagement piece portion 21 of the first embodiment, and the plate-like portion on the upper end side of the member corresponding to the guide piece portion 22 of the first embodiment is the engagement piece portion. 221 and the plate-like part on the lower end side is a guide piece part 222. In the present embodiment, the guide piece 222 is continuously formed from a part of the engagement piece 221 in this way.

  The axial direction of the rotating shaft 260 to which the rotor 220 is attached is the same as the rotating shaft 60 of the first embodiment. In addition, a mounting recess 264 is formed at the upper end of the rotating shaft 260 in the same manner as the rotating shaft 60. However, as shown in FIG. 12, in the present embodiment, a groove corresponding to the engaging groove 61 of the first embodiment is not formed in the inner peripheral portion of the mounting recess 264. In this embodiment, the groove portion 261 corresponding to the guide groove portion 62 of the first embodiment is a groove portion that has both the function of the engaging groove portion and the function of the guide groove portion. The groove part 261 is formed according to the shape of the engagement piece part 221 on the outer peripheral direction side so as to be engageable with the engagement piece part 221.

  In the present embodiment, when the rotation angle detection device 201 is attached to the rotation shaft 260, first, the lower end portion of the guide piece 222 is inserted into the groove portion 261, and then the rotation angle detection device 201 is pushed downward. The engaging piece 221 is guided to a position corresponding to the groove 261. Then, by further pushing the rotation angle detection device 201 downward, the engagement piece portion 221 is engaged with the groove portion 261, whereby the rotor 220 is engaged with the rotation shaft 260.

  Next, the effect of this embodiment will be described. In the rotation angle detection device 201 of this embodiment, a guide piece 222 is formed continuously from a part of the engagement piece 221. Therefore, the engagement piece portion 221 and the guide piece portion 222 can be integrally formed, and thereby the number of members attached to the rotor 220 can be reduced. Further, space saving is achieved by reducing the number of members attached to the rotor 220, thereby making it easier to reduce the rotation angle detection device 201.

  As mentioned above, although embodiment of this invention has been described, this invention is not limited to said embodiment, In the range which does not deviate from the objective of this invention, it can change suitably.

  In the embodiment of the present invention, the waterproof cover 10, the rotors 20, 120, 220, and the base plate 30 may be made of materials and shapes other than those described above. For example, as long as a predetermined function can be realized, the waterproof cover 10, the rotor 20, and the base plate 30 may be made of metal or other materials.

  In the embodiment of the present invention, the engagement piece portions 21, 121, and 221 may be made of materials and shapes other than those described above. For example, as long as a predetermined function can be realized, the engaging piece portion 21 may be made of synthetic resin or other material. Further, the engagement piece portion 21 may have a columnar shape or a prism shape extending in the vertical direction.

  In the embodiment of the present invention, the guide piece portions 22, 122, 222 may be made of materials and shapes other than those described above. For example, as long as a predetermined function can be realized, the guide piece 22 may be made of synthetic resin or other material. The guide piece 22 is a plate-like member having a trapezoidal plate surface whose width on the lower end side is narrower than that on the upper end side, or a truncated cone whose diameter on the lower end side is smaller than the diameter on the upper end side. The shape may be as follows.

  In the second embodiment of the present invention, the restricting convex portion 123 may have a shape other than those described above. For example, the regulating convex part 123 may be a cylindrical or hemispherical convex part. Further, the rotation angle detection device 101 may have other restricting means for restricting the movement of the rotor 120 in the axial direction instead of the restricting convex portion 123. For example, a restriction concave portion may be formed on the engagement piece portion 121 side, and a restriction convex portion may be formed on the rotating shaft 160 side.

  In the embodiment of the present invention, the rotation angle detection means 40 may have a configuration other than that described above. For example, the rotation angle detection method of the rotation angle detection means 40 may be an optical method, an electrostatic induction method, or a method using a variable resistor.

  In the embodiment of the present invention, the connector 50 may have a configuration other than that described above. Further, when the rotation angle detection means 40 has means for wirelessly transmitting the detected information to an external circuit, the connector 50 may not be provided.

DESCRIPTION OF SYMBOLS 1 Rotation angle detection apparatus 10 Waterproof cover 11 Storage part 12 Opening part 13 Screw stop part 20 Rotor 21 Engagement piece part 22 Guide piece part 22a First plate-like part 22b Second plate-like part 22c Intermediate part 22d Lower end part 30 Base plate 31 Rotor convex part 32 Through hole 40 Rotation angle detection means 41 Main drive gear 42 Driven gear 43 Wiring board 50 Connector 51 Main body part 101 Rotation angle detection device 120 Rotor 121 Engagement piece part 122 Guide piece part 123 Restriction convex part 201 Rotation angle Detection device 220 Rotor 221 Engagement piece 222 Guide piece

Claims (5)

A cover for ensuring hermeticity after being attached to the rotation shaft to be detected, a rotor having an engagement piece that can be engaged as a rotation stopper with the engaged portion of the rotation shaft, and the rotation operation of the rotor In a rotation angle detection device provided with a detection means for detecting
The rotor is provided with a guide piece for guiding the engaging piece to the engaged portion of the rotating shaft when engaged with the rotating shaft,
The rotation angle detection device according to claim 1, wherein the guide piece portion protrudes further than the engagement piece portion toward the engagement direction with the rotation shaft. A base plate that forms a space for arranging the rotor and the detection means between the cover and the cover,
The rotation angle detection device according to claim 1, wherein the guide piece portion extends to an engagement direction side with respect to a rotation shaft with respect to an arrangement position of the base plate.   The rotation angle detection device according to claim 1 or 2, wherein the guide piece portion is formed continuously from a part of the engagement piece portion. The guide piece has a spring property,
The rotation angle detection device according to any one of claims 1 to 3, wherein a distal end side of the guide piece portion is inclined toward an axial center direction of the rotation shaft. The rotation angle detection device according to any one of claims 1 to 4, further comprising a restricting portion that restricts movement of the rotor in an axial direction.