JP6347983B2 - Non-contact power transmission device - Google Patents

Description

  The present invention relates to a non-contact power transmission apparatus that transmits power using magnetic coupling between coils.

  As a device that transmits power between two members, a non-contact power transmission device that transmits power using magnetic coupling between coils has been proposed. In such a non-contact power transmission device, the first coil And the 2nd coil is respectively hold | maintained by the annular member (patent document 1). Moreover, in the non-contact electric power transmission apparatus of patent document 1, optical communication is performed using the center hole of a 1st coil, and the center hole of a 2nd coil.

JP 2000-92752 A

  When power is transmitted between the first coil and the second coil, it is necessary that the first coil and the second coil have an appropriate positional relationship. In this case, the center hole of the first coil And alignment with the center hole of the second coil.

  However, in the configuration described in Patent Document 1, optical communication is performed using the center hole of the first coil and the center hole of the second coil, and thus the above alignment is difficult.

  In view of the above problems, an object of the present invention is to provide a non-contact power transmission apparatus capable of appropriately performing power transmission and optical communication even when the first coil and the second coil move relative to each other. There is to do.

In order to solve the above-described problem, a non-contact power transmission device according to the present invention includes a first holder having a first through hole formed on a rotation center axis , and the first through hole being held by the first holder. , A first optical element held by the first holder, and the first holder facing the first holder in the direction of the rotation center axis , wherein the second through hole is the center of rotation. A second holder formed on an axis, a second coil held by the second holder so as to face the first coil, and circling around the second through hole; and the second holder A second optical element that is held and is in optical communication with the first optical element at a position avoiding the first through hole and the second through hole; and at least one of the first through hole and the second through hole On the other hand, it is concentric with the first through hole and the second through hole. A radial bearing arranged to connect the first holder and the second holder so as to be relatively rotatable, and when viewed from the direction of the rotation center axis, the optical communication is performed between the first through hole and the first holder. Between the first coil and between the second through hole and the second coil, and the first holder and the second holder are transparent to the light used for the optical communication. A light guide path in the optical communication is configured .

In the present invention, since optical communication is performed at a position avoiding the first through hole and the second through hole, the first coil and the second coil are based on the first through hole of the first holder and the second through hole of the second holder. The coil can be aligned. Therefore, power transmission and optical communication can be performed appropriately. Further, when viewed from the rotation center axis direction, optical communication is performed between the first through hole and the first coil, and between the second through hole and the second coil. For this reason, since the dispersion range of light is narrow, optical communication can be performed reliably. Further, the first holder and the second holder are relatively rotated by the radial bearing arranged concentrically with respect to the first through hole and the second through hole in at least one of the first through hole and the second through hole. Connected as possible. For this reason, since the positional relationship between the first coil and the second coil can be brought into an appropriate state by the radial bearing, the power transmission efficiency between the first coil and the second coil can be increased. In addition, the first holder and the second holder are transparent to the light used for optical communication and constitute a light guide path for optical communication. Therefore, the first through hole and the second through hole are provided. Optical communication can be easily performed at a position avoided.

  In the present invention, the optical communication is preferably performed between one light receiving element and a plurality of light emitting elements. According to this configuration, even when optical communication is performed at a position avoiding the first through hole and the second through hole, the light emitted from the light emitting element reliably reaches the light receiving element.

  In the present invention, the first holder includes a first cylindrical portion that protrudes toward the second holder, and the second holder protrudes toward the first holder so that the first cylindrical portion and the tip end portion are in contact with each other. Are provided, and the first cylindrical portion and the second cylindrical portion of the first holder and the second holder constitute a light guide path during the optical communication. . According to such a configuration, optical communication can be easily and reliably performed at a position avoiding the first through hole and the second through hole.

  In this invention, the 1st core hold | maintained at the said 1st holder on the opposite side to the said 2nd coil side with respect to the said 1st coil, and the opposite side to the said 1st coil side with respect to the said 2nd coil And a second core held by the second holder, wherein the first core overlaps the first coil on a side opposite to the second coil side, and the bottom plate An inner plate that protrudes from the inner edge and overlaps the inner peripheral portion of the first coil on the radially inner side; and an outer plate portion that protrudes from the outer edge of the bottom plate and overlaps the outer peripheral portion of the first coil on the outer radial direction. The second core includes a bottom plate portion that overlaps the second coil on the side opposite to the first coil side, and protrudes from an inner edge of the bottom plate portion in a radial direction toward an inner peripheral portion of the second coil. An inner plate portion that overlaps inside, and an outer peripheral portion of the second coil that protrudes from the outer edge of the bottom plate portion Preferably has an outer plate portion that overlaps radially outward, the. According to such a configuration, the magnetic coupling between the first coil side and the second coil side can be strengthened.

  In the present invention, in the first core and the second core, it is preferable that a thickness of the inner plate portion is larger than a thickness of the outer plate portion. According to such a configuration, it is possible to suppress the occurrence of magnetic saturation in the inner plate portion having a short circumference.

  In the present invention, the first core and the second core are split cores in which a plurality of core pieces are arranged in a circumferential direction, and the first coil passes between the core pieces constituting the first core. The end of the second coil is drawn to the side opposite to the first coil with respect to the first core, and the end of the second coil passes between the core pieces constituting the second core. The two cores are preferably drawn to the opposite side of the second coil. According to this configuration, it is possible to reduce an extra space for routing the end of the coil.

  In the present invention, it is preferable that the first core and the second core are formed by solidifying magnetic powder with a thermosetting resin. According to this configuration, the core can be manufactured with relatively simple equipment.

In the present invention, since optical communication is performed at a position avoiding the first through hole and the second through hole, the first coil and the second coil are based on the first through hole of the first holder and the second through hole of the second holder. The coil can be aligned. Therefore, power transmission and optical communication can be performed appropriately.

It is a perspective view of the non-contact power transmission device to which the present invention is applied. It is sectional drawing of the non-contact electric power transmission apparatus to which this invention is applied. It is a disassembled perspective view of the non-contact electric power transmission apparatus to which this invention is applied. It is a disassembled perspective view of the fixing unit shown in FIG. It is a disassembled perspective view which shows the structure inside the 1st holder shown in FIG. It is a disassembled perspective view of the movable unit shown in FIG. It is a disassembled perspective view which shows the structure inside the 2nd holder shown in FIG. It is explanatory drawing of the optical element for optical communications used for the non-contact electric power transmission apparatus to which this invention is applied. It is explanatory drawing which shows the position of the optical element for optical communications in the non-contact electric power transmission apparatus to which this invention is applied.

  Hereinafter, a non-contact power transmission apparatus to which the present invention is applied will be described with reference to the drawings. In addition, in the following description, the case where the 1st holder 10 and the 2nd holder 20 rotate around the axis line L is illustrated. In the following description, in the axis L direction, the side on which the first holder 10 is located will be described as one side L1, and the side on which the second holder 20 is located will be described as the other side L2.

(overall structure)
FIG. 1 is a perspective view of a non-contact power transmission apparatus to which the present invention is applied, and FIGS. 1A and 1B are perspective views of the non-contact power transmission apparatus as viewed from the other side L2 in the axis L direction; It is the perspective view seen from the one side L1 of the axis line L direction. FIG. 2 is a cross-sectional view of a non-contact power transmission apparatus to which the present invention is applied. FIG. 3 is an exploded perspective view of a non-contact power transmission apparatus to which the present invention is applied.

  1, 2 and 3, the non-contact power transmission device 1 includes a first holder 10 disposed on one side L1 in the axis L direction and a second holder 20 disposed on the other side L2 in the axis L direction. And have. In this embodiment, the first holder 10 side is configured as a fixed unit 6, and the second holder 20 side is configured as a movable unit 7 that rotates about the axis L. The first holder 10 and the second holder 20 are connected to each other via a first collar 96, a second collar 97, and a radial bearing 90 (ball bearing) so as to be relatively rotatable. More specifically, the second collar 97 is fixed to the first holder 10 with a screw 971 in a state of covering the end of the outer side 91 of the radial bearing 90 on the other side L2 in the axis L direction. On the other hand, the first collar 96 is fixed to the second holder 20 with a screw 961 in a state of covering the end portion on the one side L1 in the axis L direction of the inner ring 92 of the radial bearing 90. For this reason, since the radial bearing 90 can define the relative position of the fixed unit 6 (first holder 10) and the movable unit 7 (second holder 20) in the direction of the axis L, the fixed unit 6 (first holder 10) 10) and an appropriate gap can be secured between the movable unit 7 (second holder 20).

(Configuration of fixed unit 6)
4 is an exploded perspective view of the fixed unit 6 shown in FIG. 1. FIGS. 4A and 4B are exploded perspective views of the fixed unit 6 with the first substrate 12 and the like removed from the first holder 10. FIG. FIG. 2 is an exploded perspective view of the first holder 10 with a cover 191 removed. 5 is an exploded perspective view showing an internal configuration of the first holder 10 shown in FIG. 4. FIGS. 5A and 5B show a state in which the first coil 13 and the like are removed from the first holder 10. FIG. 2 is an exploded perspective view and an exploded perspective view of the first holder 10 with the first core 15 and the like removed.

  As shown in FIG. 4, the first substrate 12 and the cover film 192 are fixed to the one side L <b> 1 of the first holder 10 in the axis L direction by screws 193. A hole 121 is formed in the center of the first substrate 12, and a first optical element for optical communication around the hole 121 is formed on the first surface 12 a facing the other side L <b> 2 in the axis L direction of the first substrate 12. 141 is provided. A light receiving element 143 for detecting rotation is provided on the outer edge of the first substrate 12 with the light emitting surface facing the other side L2 in the axis L direction. A connector 149 is mounted on the second surface 12b facing the one side L1 in the axis L direction of the first substrate 12. For this reason, the cover film 192 has an opening 192a at a position overlapping the connector 149, and a hole 192b is formed at the center.

  In this embodiment, the first optical element 141 includes three light emitting elements 141a and one light receiving element 141b that are arranged at positions spaced apart in the circumferential direction. Here, the light emitting element 141a is mounted on the first surface 12a of the first substrate 12 with the light emitting surface facing the other side L2 in the axis L direction. On the other hand, the light receiving element 141b is mounted on the second surface 12b of the first substrate 12, but the light receiving surface of the light receiving element 141b is arranged in the direction of the axis L through the hole formed in the first substrate 12. It is exposed on the other side L2.

  As shown in FIGS. 3, 4, and 5, the first core 15, the first coil 13, and the nonmagnetic annular cover 191 are stacked on the other side L <b> 2 of the first holder 10 in the axis L direction. Has been placed. The first holder 10 includes a circular bottom plate portion 101 and a cylindrical side plate portion 102 bent from the outer peripheral edge of the bottom plate portion 101 to the other side L2 in the axis L direction. A first cylindrical portion 103 is formed at the center of the bottom plate portion 101, and a first through hole 104 is formed inside the first cylindrical portion 103. A radial bearing 90 (ball bearing) is disposed in the first through hole 104, and the radial bearing 90 is connected to the first holder 10 and the second holder 20 via the first collar 96 and the second collar 97. Is a central member that connects the two in a concentric state.

  Further, in the first cylindrical portion 103, a cylindrical end portion 108 (see FIG. 1B) extending from the inner peripheral portion toward the one side L1 in the axis L direction protrudes, and the cylindrical end portion 108 is projected. Is fitted in the hole 121 of the first substrate 12. A connecting portion 102 c for attaching the fixing unit 6 is formed on the outer surface of the side plate portion 102. Ribs 105 that connect the first cylindrical portion 103 and the side plate portion 102 are formed at four equiangular intervals in the circumferential direction on the surface of the bottom plate portion 101 on the other side L2 in the axis L direction. A positioning projection 106 is formed in a region sandwiched in the direction. In addition, protrusions 107 a and 107 b are formed on both ends of the rib 105. Further, the bottom plate portion 101 is formed with an annular step portion 109 inside the cylindrical portion 103. The annular step portion 109 prevents the outer ring 91 of the radial bearing 90 from slipping out to the one side L1 in the axis L direction. doing.

  The first coil 13 is a flat coil wound in an annular shape, and is arranged to circulate around the first cylindrical portion 103 and the first through hole 104. An annular first core 15 is arranged on one side L1 in the axis L direction with respect to the first coil 13. An adhesive layer is interposed between the first coil 13 and the first core 15.

  The first core 15 protrudes from the inner edge of the bottom plate portion 151 and overlaps the inner peripheral portion of the first coil 13 on the inner side in the radial direction, with the bottom plate portion 151 overlapping the first coil 13 on one side L1 in the axis L direction. A plate portion 152 and an outer plate portion 153 that protrudes from the outer edge of the bottom plate portion 151 and overlaps the outer peripheral portion of the first coil 13 on the outer side in the radial direction are provided. A hole 151a is formed in the bottom plate portion 151, and the first core 15 is positioned by fitting a projection 106 into the hole 151a.

The first core 15 is a divided core divided in the circumferential direction. In this embodiment, the first core 15 is divided into four at equal angular intervals, and four core pieces 150 are arranged at equal angular intervals in the circumferential direction. The core piece 150 is positioned at both ends in the circumferential direction by the protrusions 107a and 107b. In this state, the end portion 130 of the first coil 13 passes between the core pieces 150 and is drawn out to the first substrate 12 disposed on the opposite side of the first coil 15 with respect to the first core 15. Yes.

  In the first core 15 configured as described above, the thickness of the inner plate portion 152 is thicker than the thickness of the outer plate portion 153. In this embodiment, the first core 15 (core piece 150) is formed by solidifying magnetic powder with a thermosetting resin such as an epoxy resin.

(Configuration of movable unit 7)
6 is an exploded perspective view of the movable unit 7 shown in FIG. 1. FIGS. 6A and 6B are exploded perspective views of the movable unit 7 with the second substrate 22 and the like removed from the second holder 20. FIG. FIG. 4 is an exploded perspective view of the second holder 20 with a cover 291 removed. 7 is an exploded perspective view showing the internal configuration of the second holder 20 shown in FIG. 6. FIGS. 7A and 7B show the state in which the second coil 23 and the like are removed from the second holder 20. FIG. 6 is an exploded perspective view and an exploded perspective view of the second holder 20 with the second core 25 and the like removed.

  As shown in FIG. 6, the second substrate 22 and the cover film 292 are fixed to the other side L <b> 2 of the second holder 20 in the axis L direction by screws 293. A hole 221 is formed at the center of the second substrate 22, and a second optical element for optical communication around the hole 221 is formed on the first surface 22 a facing the one side L 1 in the axis L direction of the second substrate 22. 241 is provided. In addition, a light-emitting element 243 for rotation detection is provided on the outer edge of the second substrate 22 with the light-receiving surface facing one side L1 in the axis L direction. A connector 249 is mounted on the second surface 22b facing the other side L2 of the second substrate 22 in the axis L direction. For this reason, an opening 292a is formed in the cover film 292 so as to overlap with the connector 249, and a hole 292b is formed in the center.

  In the present embodiment, the second optical element 241 includes three light emitting elements 241a and one light receiving element 241b arranged at positions spaced apart in the circumferential direction. Here, the light emitting element 241a is mounted on the first surface 22a of the second substrate 22 with the light emitting surface facing the one side L1 in the axis L direction. On the other hand, the light receiving element 241 b is mounted on the second surface 22 b of the second substrate 22, but the light receiving surface of the light receiving element 241 b extends in the axis L direction through a hole formed in the second substrate 22. It is exposed on one side L1.

  As shown in FIGS. 6 and 7, the second core 25, the second coil 23, and the non-magnetic annular cover 291 are arranged on one side L <b> 1 of the second holder 20 in the axis L direction. Yes. The second holder 20 has a circular bottom plate portion 201 and a cylindrical side plate portion 202 bent from the outer peripheral edge of the bottom plate portion 201 to one side L1 in the axis L direction. In addition, a second cylindrical portion 203 is formed at the center of the bottom plate portion 201, and a cylindrical body portion 209 having a circular second through hole 204 is formed inside the second cylindrical portion 203. Yes. The 2nd penetration hole 204 has penetrated the 2nd holder 20 in the direction of an axis L, and the end of the other side L2 of the direction of an axis L is a square hole (refer to Drawing 1 (a)). For this reason, a rotating shaft can be connected using the through hole 204. The cylindrical body portion 209 protrudes from the bottom plate portion 201 toward the other side L2 in the direction of the axis L, and fits into the hole 221 of the second substrate 22. A connecting portion 202 c for attaching the movable unit 7 is formed on the outer surface of the side plate portion 202.

On the surface of one side L1 in the axis L direction of the bottom plate portion 201, connecting portions 205 that connect the second cylindrical portion 203 and the side plate portion 202 are formed at three equiangular intervals in the circumferential direction. A positioning projection 206 is formed in a region sandwiched by the circumferential direction. Further, protrusions 207 a and 207 are formed near the second cylindrical portion 203 and the side plate portion 202 of the bottom plate portion 201.
b is formed. Further, in the bottom plate portion 201, an annular step portion 208 is formed between the second cylindrical portion 203 and the second through hole 204, and the annular step portion 208 is formed on the inner ring 92 of the radial bearing 90 shown in FIG. This prevents the inner ring 92 from coming off to the other side L2 in the axis L direction.

  The second coil 23 is a flat coil wound in an annular shape, and is arranged to circulate around the second cylindrical portion 203, the cylindrical body portion 209, and the second through hole 204. An annular second core 25 is disposed on the other side L2 in the axis L direction with respect to the second coil 23. An adhesive layer is interposed between the second coil 23 and the second core 25.

  The second core 25 includes a bottom plate portion 251 that overlaps the second coil 23 on the other side L2 in the axis L direction, and an inner portion that protrudes from the inner edge of the bottom plate portion 251 and overlaps the inner peripheral portion of the second coil 23 in the radial direction. A plate portion 252 and an outer plate portion 253 that protrudes from the outer edge of the bottom plate portion 251 and overlaps with the outer peripheral portion of the second coil 23 on the radially outer side. A hole 251a is formed in the bottom plate portion 251, and the positioning of the second core 25 is performed by fitting the projection 206 into the hole 251a.

  The second core 25 is a divided core divided in the circumferential direction. In this embodiment, the second core 25 is divided into three at equal angular intervals, and three core pieces 250 are arranged at equal angular intervals in the circumferential direction. The core piece 250 is positioned at both ends in the circumferential direction by the protrusions 207a and 207b. In this state, the end 230 of the second coil 23 passes between the core pieces 250 and is drawn to the second substrate 22 disposed on the opposite side of the second coil 25 from the second coil 23. Yes. In this embodiment, since the first core 15 is divided into four and the second core 25 is divided into three, the gap between the core piece 150 of the first core 15 and the gap between the core pieces 250 of the second core 25 are plural. There is no overlap. Therefore, fluctuations in magnetic characteristics can be suppressed.

  In the second core 25 configured as above, the thickness of the inner plate portion 252 is thicker than the thickness of the outer plate portion 253. In this embodiment, the second core 25 (core piece 250) is formed by solidifying magnetic powder with a thermosetting resin such as an epoxy resin.

  In the movable unit 7 configured as described above, the second coil 23 and the second core 25 held by the second holder 20 are the same as the first coil 13 and the first core held by the first holder 10 in the fixed unit 6. 15 and facing in the axial L direction. The movable unit 7 rotates around a radial bearing 90 disposed in the first through hole 104 of the first holder 10. Therefore, if the first coil 13 is energized, an electromotive force is induced in the second coil 23 by magnetic coupling between the second coil 23 and the second core 25 and the first coil 13 and the first core 15. Can be made. Therefore, power can be transmitted from the fixed unit 6 to the movable unit 7.

(Configuration for optical communication)
FIG. 8 is an explanatory diagram of an optical element for optical communication used in the non-contact power transmission apparatus 1 to which the present invention is applied. FIGS. 8A and 8B show the first substrate 12 and the second substrate 22. 2 is a perspective view of the first substrate 12 and the second substrate 22 as viewed from one side L1 in the axis L direction. FIGS. 9A and 9B are explanatory views showing the positions of optical elements for optical communication in the non-contact power transmission apparatus 1 to which the present invention is applied. FIGS. 9A and 9B show the second holder 20 in the direction of the axis L. They are the perspective view seen from the other side L2, and the perspective view which looked at the 1st holder 10 from the one side L1 of the axis line L direction.

As shown in FIG. 8, on the first surface 12a facing the other side L2 in the direction of the axis L of the first substrate 12, the first optical element 141 (for optical communication) at a position equidistant from the axis L (hole 121). A light emitting element 141a and a light receiving element 141b), and one side L1 of the second substrate 22 in the axis L direction.
The second optical element 241 (light emitting element 241a and light receiving element 241b) for optical communication is provided at a position equidistant from the axis L (hole 221) on the first surface 22a facing toward. Various electronic components 144 are mounted on the second surface 12b facing the one side L1 in the axis L direction of the first substrate 12, and on the second surface 22b facing the other side L2 of the second substrate 22 in the axis L direction. Various electronic components 244 are mounted.

  Here, the distance from the axis L to the first optical element 141 (light emitting element 141a and light receiving element 141b) is equal to the distance from the axis L to the second optical element 241 (light emitting element 241a and light receiving element 241b). For this reason, when the movable unit 7 rotates around the axis L, the second optical element 241 (the light emitting element 241a and the light receiving element 241b) has an axis L relative to the first optical element 141 (the light emitting element 141a and the light receiving element 141b). Pass through the overlapping position in the direction.

  The first substrate 12 having such a configuration overlaps with the bottom plate portion 101 of the first holder 10 shown in FIG. 9B on one side L1 in the axis L direction. On one side L1 in the direction of the axis L in the bottom plate portion 101 of the first holder 10, a recess 101e is formed at a position overlapping the light emitting element 141a, and a recess 101f is formed at a position overlapping the light receiving element 141b. In this embodiment, the recesses 101e and 101f are formed at positions overlapping the first cylindrical portion 103 of the first holder 10.

  Further, the second substrate 22 shown in FIG. 8 overlaps the bottom plate portion 201 of the second holder 20 shown in FIG. 9A on the other side L2 in the axis L direction. On the other side L2 in the axis L direction of the bottom plate portion 201 of the second holder 20, a recess 201e is formed at a position overlapping the light emitting element 241a, and a recess 201f is formed at a position overlapping the light receiving element 241b. In this embodiment, the recesses 201e and 201f are formed at positions that overlap the second cylindrical portion 203 of the second holder 20.

  Here, in the first holder 10, the first cylindrical portion 103 protrudes from the bottom plate portion 101 toward the second holder 20, and in the second holder 20, the second cylindrical portion 203 extends from the bottom plate portion 201 toward the first holder 10. The first cylindrical portion 103 and the second cylindrical portion 203 are opposed to each other in the axis L direction.

  The first holder 10 and the second holder 20 including the first cylindrical portion 103 and the second cylindrical portion 203 as a whole are transparent to the light emitted from the light emitting elements 141a and 241a (light used for optical communication). It has light properties. Therefore, the light emitted from the light emitting element 141a on the fixed unit 6 side is received on the movable unit 7 side using the first cylindrical portion 103 of the first holder 10 and the second cylindrical portion 203 of the second holder 20 as light guide paths. The element 241b is reached. The light emitted from the light emitting element 241a on the movable unit 7 side is received on the fixed unit 6 side by using the second cylindrical portion 203 of the second holder 20 and the first cylindrical portion 103 of the first holder 10 as a light guide path. It reaches the element 141b. Therefore, bidirectional optical communication is performed between the fixed unit 6 (first holder 10 side) and the movable unit 7 (second holder 20 side) using the first holder 10 and the second holder 20 as a light guide path. It can be carried out. That is, according to this embodiment, optical communication can be performed at a position avoiding the first through hole 104 of the first holder 10 and the second through hole 204 of the second holder 20.

  In this embodiment, the first cylindrical portion 103 of the first holder 10 is located inside the hole of the cover 191, the second cylindrical portion 203 of the second holder 20 is located inside the hole of the cover 291, The light for optical communication passes through the inside of the covers 191 and 291. However, the cover 191 and 291 may be interposed between the first cylindrical portion 103 of the first holder 10 and the second cylindrical portion 203 of the second holder 20. In this case, the covers 191 and 291 may be used. Has a light-transmitting property with respect to light emitted from the light-emitting elements 141a and 241a (light used for optical communication).

(Main effects of this form)
As described above, the non-contact power transmission device 1 of the present embodiment includes the first holder 10 in which the first through hole 104 is formed and the second holder 20 in which the second through hole 204 is formed, The first coil 13 held by the first holder 10 and the second coil 23 held by the second holder 20 circulate around the first through hole 104 and the second through hole 204. For this reason, if the 1st holder 10 and the 2nd holder 20 are positioned on the basis of the 1st penetration hole 104 and the 2nd penetration hole 204, transmission of electric power between the 1st coil 13 and the 2nd coil 23 is carried out. It can be done properly. Further, the first optical element 141 for optical communication held by the first holder 10 and the second optical element 241 held by the second holder 20 include the first through hole 104 and the second through hole 204. Optical communication is performed at the avoided position. For this reason, even when positioning the 1st holder 10 and the 2nd holder 20 on the basis of the 1st through-hole 104 and the 2nd through-hole 204, optical communication can be performed appropriately.

  That is, in the present embodiment, of the first through hole 104 and the second through hole 204, the radial bearing 90 concentric with the first through hole 104 and the second through hole 204 is used as the central member. Has been placed. For this reason, the 1st holder 10 and the 2nd holder 20 rotate relatively centering on the radial bearing 90 (center member). Therefore, since the concentricity of the first coil 13 and the second coil 23 can be ensured, the power transmission efficiency between the first coil 13 and the second coil 23 can be increased. When such a configuration is adopted, the first through hole 104 and the second through hole 204 cannot be used as the light guide path. However, in this embodiment, the first through hole 104 and the second through hole 204 are avoided. Since optical communication is performed, optical communication can be performed appropriately. Further, since the radial bearing 90 can define the relative position of the fixed unit 6 (first holder 10) and the movable unit 7 (second holder 20) in the direction of the axis L, the fixed unit 6 (first holder 10). ) And the movable unit 7 (second holder 20). Therefore, the power transmission efficiency between the first coil 13 and the second coil 23 can be increased.

  Further, when viewed from the direction of the axis L, optical communication is performed between the first through hole 104 and the first coil 13 and between the second through hole 204 and the second coil 23. For this reason, since the dispersion range of light is narrow, optical communication can be performed reliably.

  Moreover, since the 1st holder 10 and the 2nd holder 20 have transparency with respect to the light used for optical communication, it can be utilized as a light guide path in the case of optical communication. In particular, in this embodiment, the first cylindrical portion 103 of the first holder 10 and the second cylindrical portion 203 of the second holder 20 whose front end faces the first cylindrical portion 103 are used as a light guide path. For this reason, even when optical communication is performed at a position avoiding the first through hole 104 and the second through hole 204, the configuration of the light guide path can be simplified and reliable optical communication can be performed.

  In this embodiment, optical communication is performed between one light receiving element 241b and a plurality of light emitting elements 141a, and between one light receiving element 141b and a plurality of light emitting elements 241a. At that time, the plurality of light emitting elements 141a output the same optical signal, and the plurality of light emitting elements 241a output the same optical signal. For this reason, even when optical communication is performed at a position avoiding the first through hole 104 and the second through hole 204, the light emitted from the light emitting element 141a reliably reaches the light receiving element 241b and the light emitted from the light emitting element 241a. Surely reaches the light receiving element 141b.

  In this embodiment, the first core 15 is disposed on the opposite side of the first coil 13 from the second coil 23 side, and the second core is disposed on the opposite side of the second coil 23 from the first coil 13 side. 25 is arranged. For this reason, the magnetic coupling between the first coil 13 side and the second coil 23 side can be strengthened. Moreover, in the first core 15 and the second core 25, the thickness of the inner plate portions 152 and 252 is thicker than the thickness of the outer plate portions 153 and 253. For this reason, it can suppress that magnetic saturation generate | occur | produces in the inner-plate parts 152 and 252 with short circumference.

  The first core 15 and the second core 25 are split cores, and the space between the core pieces 150 and 250 is used for drawing out the end portion 130 of the first coil 13 and the end portion 230 of the second coil 23. . For this reason, an extra space for routing the end portion 130 of the first coil 13 and the end portion 230 of the second coil 23 can be reduced.

  In addition, since the first core 15 and the second core 25 are made of a magnetic powder that is hardened by a thermosetting resin, unlike the sintering, there is no need for a facility for compressing at a high pressure. Can be manufactured.

  An annular step 109 is formed on the inner side in the radial direction of the first cylindrical portion 103 of the first holder 10, and an annular step 208 is also formed on the inner side in the radial direction of the second cylindrical portion 203 of the second holder 20. . Therefore, the outer ring 91 of the radial bearing 90 is prevented from coming off by the annular step portion 109, and the inner ring 92 of the radial bearing 90 is kept from coming off by the annular step portion 208. Therefore, the movable unit 7 (second holder 20) can be stably supported via the radial bearing 90 in the fixed unit 6 (first holder 10). Further, the radial bearing 90 can ensure an appropriate gap between the fixed unit 6 (first holder 10) and the movable unit 7 (second holder 20).

  In this embodiment, since the radial bearing 90 is annular, a large load is not applied to the first holder 10 and the second holder 20. Therefore, it is not necessary to configure the first holder 10 and the second holder 20 with an expensive material having excellent load resistance.

[Other embodiments]
In the above embodiment, the radial bearing 90 is arranged using the first through hole 104, but the radial bearing 90 may be arranged using both the first through hole 104 and the second through hole 204.

  In the above embodiment, a ball bearing is used as the radial bearing 90, but a slide bearing may be used.

  In the above embodiment, the first core 15 is divided into four and the second core 25 is divided into three. However, the first core 15 may be divided into other numbers. In any case, the gap between the core pieces 150 of the first core 15 and the gap between the core pieces 250 of the second core 25 may be divided into a number that does not overlap at a plurality of locations.

  In the above embodiment, the radial bearing 90 is arranged using the first through hole 104. However, the non-contact power transmission apparatus configured so that the first holder 10 and the second holder 20 slide in a direction orthogonal to the axis L. The present invention may be applied to. In this case, the radial bearing 90 is not provided, and the opposed surfaces of the first holder 10 and the second holder 20 are parallel surfaces.

Non-contact power transmission device 6 Fixed unit 7 Movable unit 10 First holder 12 First substrate 13 First coil 15 First core 20 Second holder 22 The second substrate 23 The second coil 90 The radial bearing 103 The first cylindrical portion 104 The first through hole 109 The annular step 130 The end of the first coil 141 ··· First optical elements 141a and 241a ··· Light emitting elements 141b and 241b · · Light receiving elements 150 and 250 · · Core pieces 151 and 251 · · Bottom plate portions 152 and 252 · · Inner plate portions 153, 253 ·· Outer plates Part 203 .. second cylindrical part 204 .. second through hole 208 .. annular step part 209 .. cylindrical body part 230 .. second coil end 241 .. second optical element

Claims (7)

A first holder in which a first through hole is formed on a rotation center axis ;
A first coil held by the first holder and circling around the first through hole;
A first optical element held by the first holder;
A second holder which is opposed to the first holder in the direction of the rotation center axis and in which a second through hole is formed on the rotation center axis ;
A second coil held by the second holder so as to face the first coil and circling around the second through hole;
A second optical element that is held by the second holder and performs optical communication with the first optical element at a position avoiding the first through hole and the second through hole;
At least one of the first through hole and the second through hole is disposed concentrically with respect to the first through hole and the second through hole, and the first holder and the second holder are rotated relative to each other. A radial bearing to be coupled,
Have
When viewed from the rotational axis direction, the optical communication is performed between the first through hole and the first coil, and between the second through hole and the second coil.
The non-contact power transmission device, wherein the first holder and the second holder are transparent to light used in the optical communication and constitute a light guide path in the optical communication. .   The contactless power transmission apparatus according to claim 1, wherein the optical communication is performed between one light receiving element and a plurality of light emitting elements. The first holder includes a first cylindrical portion protruding toward the second holder,
The second holder includes a second cylindrical portion that protrudes toward the first holder and is opposed to the first cylindrical portion and the tip portion,
The said 1st cylindrical part and the said 2nd cylindrical part comprise the light guide path in the case of the said optical communication among the said 1st holder and the said 2nd holder, The Claim 1 or 2 characterized by the above-mentioned. Non-contact power transmission device. A first core held by the first holder on the side opposite to the second coil with respect to the first coil;
A second core held by the second holder on the side opposite to the first coil with respect to the second coil;
Have
The first core protrudes from the inner edge of the bottom plate portion and overlaps the inner peripheral portion of the first coil on the inner side in the radial direction, and overlaps with the first coil on the side opposite to the second coil side. An inner plate portion, and an outer plate portion that protrudes from the outer edge of the bottom plate portion and overlaps the outer peripheral portion of the first coil on the radially outer side,
The second core protrudes from the inner edge of the bottom plate and overlaps the inner peripheral portion of the second coil on the inner side in the radial direction, and overlaps with the second coil on the side opposite to the first coil with respect to the second coil. It has an inner-plate part and the outer-plate part which protrudes from the outer edge of the said baseplate part, and overlaps with the outer peripheral part of the said 2nd coil on the outer side of radial direction, The Claim 1 thru | or 3 characterized by the above-mentioned. Non-contact power transmission device. The contactless power transmission device according to claim 4, wherein the first core and the second core have a thickness of the inner plate portion larger than a thickness of the outer plate portion . The first core and the second core are divided cores in which a plurality of core pieces are arranged in a circumferential direction,
The end of the first coil is drawn out to the opposite side of the first coil with respect to the first core through the core pieces constituting the first core,
The end of the second coil passes between the core pieces constituting the second core, and is drawn out to the opposite side of the second coil with respect to the second core. The contactless power transmission device according to 4 or 5 . The contactless power transmission device according to any one of claims 4 to 6, wherein the first core and the second core are formed by solidifying magnetic powder with a thermosetting resin .

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