JP2018181494A - Rotary connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary connector, the diameter of which can be reduced while ensuring required connecting ability in the vertical direction.SOLUTION: In a rotary connector, a rotor has a first rotor, a second rotor assembled to the first rotor in the axial direction from the first side thereof, and a coupling part. The coupling part includes a snap piece provided in the second rotor, and deformable elastically to a radial direction second position that is farther radial inside than a radial direction first position, and an engaged part provided in the first rotor, and with which the snap piece at the radial direction first position engages. The snap piece includes a first plane part perpendicular to the axial direction, and a first ramp inclining such that farther radial outside than the radial inside becomes the first side in the axial direction for the first plane part, at different positions in the hoop direction. The engaged part includes a second plane part abutting on the first plane part in the axial direction, and a second ramp facing the first ramp in the axial direction, and inclining in such a direction that the farther radial outside than the radial inside becomes axial direction first side for the second plane.SELECTED DRAWING: Figure 5

Description

  The present disclosure relates to a rotary connector.

  A stator fixed to a vehicle, a rotor rotatably supported by the stator, a cable electrically connecting the stator and the rotor, and a space in which a steering shaft is axially inserted are made radially inward DESCRIPTION OF RELATED ART The rotary connector provided with the inner peripheral wall which forms and is extended in the circumferential direction is known (for example, refer patent document 1). The rotor is composed of upper and lower two members forming an inner peripheral wall, and the upper and lower two members are connected by snap fitting at a connecting portion on the inner peripheral wall side.

JP, 2016-39108, A

  However, in the rotary connector according to the prior art as described above, it is difficult to reduce the radial engagement range (the overlap range in the radial direction between the upper and lower members in the connection portion) in the connection portion, and the inner peripheral wall It is difficult to reduce the diameter of the rotary connector and the diameter of the rotary connector accordingly. If the radial engagement range at the connecting portion is reduced, the diameter of the inner peripheral wall can be reduced, but it becomes difficult to secure the necessary connecting capability in the vertical direction.

  So, in one side, the present invention aims at offer of a rotation connector which can be reduced in diameter, securing required connection capacity of the up-and-down direction.

In one aspect, the stator, the rotor rotatable relative to the stator, the cable electrically connecting the stator and the rotor, and the axially penetrating space radially inward And a circumferentially extending inner circumferential wall.
The rotor includes a first rotor, and a second rotor assembled to the first rotor from an axial first side,
A connecting portion connecting the first rotor and the second rotor and forming a part of the inner circumferential wall;
The connecting portion is provided on the second rotor, and is provided on the first rotor together with a snap piece elastically deformable at a second radial position on the radially inner side of the first radial position, the radial direction An engaged portion engaged with the snap piece in the first position;
The snap piece has a first flat surface portion perpendicular to the axial direction, and a first flat surface portion inclined with respect to the first flat surface portion in a direction in which the radially outer side is the axial first side than the radial inner side With one inclined portion, at different positions in the circumferential direction,
The engaged portion is opposed to the first flat portion in the axial direction with respect to the second flat portion that contacts the first flat portion in the axial direction, and the radial direction inner side with respect to the second flat portion. A rotary connector is provided, comprising: a second inclined portion which is inclined such that the radially outer side is the first axial direction.

  In one aspect, according to the present invention, it is possible to obtain a rotary connector that can be reduced in diameter while securing the necessary connecting capability in the vertical direction.

FIG. 1 is an external perspective view of a rotary connector according to a first embodiment. It is a principal part disassembled perspective view of a rotation connector. FIG. 10 is an explanatory view of a connecting portion 70. It is a perspective view for explanation of snap piece 200. As shown in FIG. It is a perspective view for explanation of convex part 250. As shown in FIG. FIG. 7 is a cross-sectional view of the through hole side facing surface 112 passing through the flat portion 114; FIG. 6 is a cross-sectional view of the through hole side facing surface 112 through the inclined portion 116; It is explanatory drawing of the variation (the 1) of the inclination aspect of the inclination part 116 and the inclination part 256, and the height relationship of an axial direction. It is explanatory drawing of the variation (the 2) of the inclination aspect of the inclination part 116 and the inclination part 256, and the height relationship of an axial direction. It is explanatory drawing of the variation (the 3) of the inclination aspect of the inclination part 116 and the inclination part 256, and the height relationship of an axial direction. It is explanatory drawing of the principle which the connection capability of an axial direction increases. FIG. 21 is a perspective view showing a recess 202A in a first rotor 21A according to a second embodiment. FIG. 21 is a perspective view showing a convex portion 250A in a second rotor 22A according to a second embodiment. FIG. 10 is a cross-sectional view through the flat portion 244 according to the second embodiment. FIG. 14 is a cross-sectional view through the inclined portion 246 according to the second embodiment.

  Hereinafter, each example will be described in detail with reference to the attached drawings.

Example 1
FIG. 1 is an external perspective view of a rotary connector 1 according to a first embodiment. FIG. 2 is an exploded perspective view of an essential part of the rotary connector 1. 1 and 2 show the rotation axis I of the rotary connector 1 and the Z axis parallel to the rotation axis I. In the following, for convenience of explanation, the Z1 side in the Z direction (an example of the second axial side) is “upper side”, and the Z2 side in the Z direction (an example of the first axial side) is “lower side” in the axial direction, The radial direction and the circumferential direction are based on the rotation axis I. Specifically, the axial direction refers to the direction of the rotation axis I. The radially inner side indicates the side closer to the rotation axis I, and the radially outer side indicates the side farther to the rotation axis I. Further, the circumferential direction refers to the circumferential direction around the rotation axis I.

  The rotary connector 1 is a connection device for transmitting an electrical signal between a steering column (not shown) of a vehicle and an electronic component (not shown) that rotates integrally with a steering shaft (not shown). .

  As shown in FIGS. 1 and 2, the rotary connector 1 includes a rotor 2, a stator 3, and flat cables 4 and 5. The rotary connector 1 also includes an inner circumferential wall 8 through which the steering shaft is inserted in the axial direction.

  The steering shaft included in the steering column is inserted through the rotor 2 in the axial direction. The rotor 2 is an annular member defining the inner peripheral wall 8 radially inward. The rotor 2 is formed of, for example, a resin material.

  The rotor 2 is rotatably supported by the stator 3. The stator 3 includes upper and lower two members 21 and 22, and the members 21 and 22 are fitted in the axial direction. Hereinafter, the members 21 and 22 are also referred to as a first rotor 21 and a second rotor 22, respectively. The second rotor 22 is axially assembled to the first rotor 21 from the lower side in the axial direction to the upper side in the axial direction. The first rotor 21 and the second rotor 22 are connected to each other through a connecting portion 70. A plurality of (for example, four) connection portions 70 may be set along the circumferential direction. The connecting portion 70 is formed radially inward of the first rotor 21 and the second rotor 22, and forms a part of the inner peripheral wall 8.

  The stator 3 is fixed to the vehicle. The stator 3 is attached to the steering column. The rotor 2 is rotatably assembled to the stator 3. The stator 3 is an annular member defining the outer peripheral wall 9 radially outward. The stator 3 is formed of, for example, a resin material. The stator 3 includes upper and lower two members 3A and 3B, and the members 3A and 3B are fitted in the axial direction.

  The flat cables 4 and 5 are an example of a cable electrically connecting the stator 3 and the rotor 2, and ensure electrical conduction between the rotor 2 and the stator 3. The flat cables 4 and 5 are in a flat form, and PET (Poly-ethylene-terephthalate) may be used as an insulating film. Also, the flat cables 4 and 5 may be formed by FPC (Flexible Printed Circuits).

  The flat cables 4 and 5 are provided in an annular space (not shown) in the main body of the rotary connector 1. Specifically, an annular space extending in the circumferential direction is formed between the inner peripheral wall 8 and the outer peripheral wall 9 in the radial direction, and the flat cables 4 and 5 are accommodated in the annular space. The flat cables 4 and 5 may be spirally wound and stored, for example, in a superimposed manner.

  Next, the connecting portion 70 will be described in detail with reference to FIG. Below, although it demonstrates on behalf of one connection part 70, it may be the same also about the other connection part 70. FIG.

  FIG. 3 is an enlarged view of P of FIG. 1 and an explanatory view of the connecting portion 70. As shown in FIG. FIG. 4 is a perspective view for explaining the snap piece 200, and FIG. 5 is a perspective view for explaining the projection 250. As shown in FIG.

  The connecting portion 70 includes a snap piece 200 provided on the second rotor 22 and a protrusion 250 (an example of an engaged portion) provided on the first rotor 21.

  As shown in FIG. 4, the snap piece 200 has a through hole 202 penetrating in the radial direction, and has a substantially hollow shape when viewed in the radial direction. In a modification, the through hole 202 may be replaced by a recess (a difference which is not penetrated) which is recessed inward in the radial direction. When the second rotor 22 is axially assembled from the lower side to the upper side in the axial direction from the lower side to the upper side in the axial direction, the snap piece 200 has a radially inner position (radial second position) (E.g.) can be elastically deformed, and when the convex portion 250 is fitted into the through hole 202, it returns radially outward to the original radial position (an example of the first radial position) (i.e., so-called snap) Mating is realized).

  The convex portion 250 protrudes radially inward to engage with the through hole 202, as shown in FIG. The convex portion 250 is fitted into the through hole 202 when the second rotor 22 is assembled axially upward with respect to the first rotor 21 as described above. When the convex portion 250 is fitted into the through hole 202, the axially lower surface of the through hole 202 (hereinafter referred to as “through hole side facing surface 112”) and the axially upper surface of the convex portion 250 (hereinafter referred to as “convex The part facing surface 252 ′ ′ ”is opposed in the axial direction.

  Here, the through hole side facing surface 112 and the convex portion side facing surface 252 will be described in more detail with reference to FIGS. 4 and 5 described above and FIGS. 6 and 7.

  FIG. 6 is a cross-sectional view taken along a plane passing through the rotation axis I and is a cross-sectional view passing through a flat portion 114 described later of the through hole side facing surface 112. FIG. 7 is a cross-sectional view when cut by a plane passing through the rotation axis I, and is a cross-sectional view through the below-described inclined portion 116 of the through hole side facing surface 112.

  As shown in FIG. 4, the through hole side facing surface 112 includes a flat portion 114 (an example of a first flat portion) and an inclined portion 116 (an example of a first inclined portion) at different positions in the circumferential direction. The flat portion 114 is a surface having an axial direction as a normal. The inclined portion 116 is a surface inclined in a direction in which the radially outer side is axially lower than the radially inner side. That is, the radially outer side of the inclined portion 116 is lower than the radially inner side at the axial position (the lower side in the axial direction).

  The convex-part-side facing surface 252 includes, as shown in FIG. 5, flat portions 254 (an example of a second flat portion) and inclined portions 256 (an example of a second inclined portion) at different positions in the circumferential direction. The flat portion 254 is a surface having an axial direction as a normal. The inclined portion 256 is a surface inclined such that the radially outer side is axially lower than the radially inner side. That is, the radially outer side of the inclined portion 256 is lower than the radially inner side at the axial position (the lower side in the axial direction). The slope aspect of the sloped portion 256 may be the same as the sloped portion 116. That is, the sloped portion 256 and the sloped portion 116 may be substantially parallel. Note that "substantially parallel" is a concept that may make a slight angle with each other due to manufacturing requirements and the like. The inclination angle of the inclined portion 256 and the inclined portion 116 is, for example, about 10 degrees with respect to a plane normal to the Z axis.

  The flat portion 254 of the convex-side facing surface 252 axially faces the flat portion 114 of the through-hole-side facing surface 112, and the sloped portion 256 of the convex-side facing surface 252 is the sloped portion of the through-hole-side facing surface 112. It axially faces 116. Therefore, the flat portion 254 of the convex portion side facing surface 252 and the flat portion 114 of the through hole side facing surface 112 are formed in the same range in the circumferential direction, and the inclined portion 256 of the convex portion side facing surface 252 and the through hole side The inclined portion 116 of the facing surface 112 is formed in the same range in the circumferential direction.

  Under the present circumstances, as shown in FIG. 6, the flat part 254 of the convex part side opposing surface 252 and the plane part 114 of the through-hole side opposing surface 112 contact | abut in the axial direction in the aspect (plane contact) which planes meet. Contact. Thereby, rattling to the axial direction lower side of the 2nd rotor 22 to the 1st rotor 21 can be reduced. In this manner, the flat portion 254 of the convex portion-side opposing surface 252 and the flat portion 114 of the through-hole-side opposing surface 112 abut against each other in the axial direction of the second rotor 22 with respect to the first rotor 21. Reduce. Although the rattle of the second rotor 22 with respect to the first rotor 21 to the upper side in the axial direction is not shown, for example, in the region radially outside the inner peripheral wall 8, the axially upper surface of the second rotor 22 is the first It may be regulated by axially abutting the lower surface of the rotor 21 in the axial direction.

  On the other hand, the sloped portion 256 of the convex portion-side facing surface 252 and the sloped portion 116 of the through-hole-side facing surface 112 oppose each other in a manner slightly separated in the axial direction, as shown in FIG. That is, as shown by a predetermined clearance Δ in FIG. 7, the inclined portion 256 and the inclined portion 116 oppose each other in a mode of being slightly separated in the axial direction. The clearance Δ corresponds to a difference in height (a difference in position in the axial direction) between the inner and outer radial directions in the inclined portion 116. When such a clearance Δ is set, the sloped portion 256 of the convex portion-side facing surface 252 and the sloped portion 116 of the through-hole-side facing surface 112 are not mutually constrained in the axial direction. However, the rattle (later downward in the axial direction of the second rotor 22 with respect to the first rotor 21) caused by the clearance Δ is the flat portion 254 of the convex portion facing surface 252 and the flat portion of the through hole facing surface 112. And 114 abut against in the axial direction as described above.

  Here, the radially outermost position of the inclined portion 116 and the radially innermost position of the inclined portion 256 are preferably substantially the same in the axial direction, as shown in FIGS. 8A to 8C. . The "substantially the same" is a concept that may have a minute difference due to manufacturing tolerance or the like. In this case, the flat portion 254 of the convex facing surface 252 and the flat portion 114 of the through hole facing surface 112 axially abut each other at the snap-fit position in the axial direction. Therefore, in a configuration in which the radially outermost position in the inclined portion 116 and the radially innermost position in the inclined portion 256 are substantially the same, the radially outermost position in the inclined portion 116 is the inclined portion 256. The rattling of the second rotor 22 with respect to the first rotor 21 in the axial direction can be reduced, as compared with the configuration (not shown) in which the second rotor 22 is significantly axially higher than the radially innermost position. Further, in a configuration in which the outermost position in the radial direction in the inclined portion 116 and the innermost position in the radial direction in the inclined portion 256 are substantially the same, the outermost position in the radial direction in the inclined portion 116 is the inclined portion 256 Even when the snap piece 200 is elastically deformed inward in the radial direction as compared with the configuration (not shown) that is significantly axially higher than the radially innermost position, the inclined portion 116 and the inclined portion 256 have a diameter The possibility of catching in the direction is increased, and the detachment of the snap piece 200 from the protrusion 250 can be reduced.

  8A to 8C schematically show the slopes of the sloped portion 116 and the sloped portion 256 and the height relationship in the axial direction, together with the flat portions 114 and 254. 8A to 8C, a line connecting the radially outermost position of the inclined portion 116 and the radially inner position of the inclined portion 256 is indicated by a dashed dotted line L2. The fact that the dashed-dotted line L2 is perpendicular to the axial direction means that the radially outermost position of the inclined portion 116 and the radially innermost position of the inclined portion 256 are the same. As shown in FIGS. 8A to 8C, the positions (axial positions) of the flat portions 114 and 254 are arbitrary, for example, the same as the radially innermost position in the inclined portion 116 as shown in FIG. 8A. Or may be the same as the radially outermost position of the inclined portion 116 as shown in FIG. 8C, or, as shown in FIG. It may be the same as the position of. Alternatively, although not shown, the positions (axial positions) of the flat portions 114 and 254 may be arbitrary as long as they are the same as each other, and may be higher than the radially innermost position in the inclined portion 116. It may be lower than the dashed line L2.

  By the way, since the first rotor 21 and the second rotor 22 are connected by the connecting portion 70 as described above, the axial connecting capability (for example, a holding force of 100 N or more) required by the connecting portion 70 can be obtained. It is useful to secure. For example, when the second rotor 22 is pulled downward in the axial direction, the snap pieces 200 in the connecting portion 70 come off from the convex portion 250 and come out, but the higher the limit value (tensile force) at the time of coming off, the axial connection Ability will be high. In order to enhance the coupling capability in the axial direction, the radial engagement range (the first rotor 21 and the second rotor 21 and the second in the coupling portion 70) can be obtained by increasing the protrusion amount d1 of the convex portion 250 (see FIGS. It is effective to increase the radial overlap range) between the rotors 22. However, if the protrusion amount d1 of the convex portion 250 is increased, it is difficult to reduce the diameter of the inner peripheral wall 8 and the diameter of the rotary connector 1 accordingly. This is because the radially innermost position of the projection 250 determines the radially innermost position of the inner circumferential wall 8.

  In this respect, according to the first embodiment, since the sloped portion 256 of the convex portion side facing surface 252 and the sloped portion 116 of the through hole side facing surface 112 are provided, the sloped amount d1 of the convex portion 250 is the same. Compared with the case where the portion 256 and the sloped portion 116 are not provided (for example, as compared to the case where the sloped portion 256 and the sloped portion 116 are flat portions), the connection ability in the vertical direction can be enhanced. This is because, as schematically shown in FIG. 9, when the second rotor 22 is pulled downward, the sloped portion 256 and the sloped portion 116 engage, and the radial direction outward with respect to the snap piece 200. This is because the force F (force F acting in the direction to prevent detachment) acts.

  Thus, according to the first embodiment, by providing the sloped portion 256 of the convex portion-side facing surface 252 and the sloped portion 116 of the through-hole-side facing surface 112, between the first rotor 21 and the second rotor 22. Can increase the axial connection ability of the Therefore, according to the first embodiment, compared with the case where the inclined portion 256 or the inclined portion 116 is not provided, the protrusion amount d1 of the convex portion 250 is reduced while securing the necessary connecting ability in the axial direction, and the rotary connector 1 It is possible to reduce the diameter of In the first embodiment, the protrusion amount d1 may be, for example, about 1 mm.

  Here, in the case where only the sloped portion 256 and the sloped portion 116 are provided without the flat portion 254 and the flat portion 114, the axial connection ability between the first rotor 21 and the second rotor 22 can be enhanced. However, axial rattling occurs between the first rotor 21 and the second rotor 22. This is because, as described above with reference to FIGS. 8A to 8C, in the case where the inclined portion 256 and the inclined portion 116 are provided, in order to realize a snap fitting (the outermost position in the radial direction of the inclined portion 116 This is because a rattling of the clearance Δ is generated in the axial direction because the radially innermost position in the radial direction of the sloped portion 256 is exceeded in the axial direction).

  In this point, according to the first embodiment, by providing the flat portion 254 of the convex portion side facing surface 252 and the flat portion 114 of the through hole side facing surface 112, the inclined portion 256 of the convex portion side facing surface 252 and the through hole side Even when the inclined portion 116 of the facing surface 112 is provided, the axial rattling between the first rotor 21 and the second rotor 22 can be significantly smaller than the rattling of the clearance Δ in the axial direction.

  Incidentally, when the circumferential lengths of the inclined portion 256 and the inclined portion 116 are increased, the engaging force between the inclined portion 256 of the convex portion side opposing surface 252 and the inclined portion 116 of the through hole side opposing surface 112 (see FIG. The force F) is increased, and the axial connection capability is increased. On the other hand, the flat portion 254 and the flat portion 114 can maintain the ability to reduce the axial rattling between the first rotor 21 and the second rotor 22 even if the circumferential length is somewhat short. Therefore, the ratio of the circumferential length between the inclined portion 256 and the flat portion 254 (the same applies to the ratio of the circumferential length between the inclined portion 116 and the flat portion 114) is 3: 1 or 4: It may be about one.

Example 2
In Example 1 mentioned above, although the 1st rotor 21 side has convex part 250 and the 2nd rotor 22 side has penetration hole 202, in Example 2, it differs from Example 1 in the point which becomes reverse. In the following, in the second embodiment, parts different from the first embodiment will be mainly described.

  FIG. 10 is a perspective view showing the recess 202A in the first rotor 21A, and FIG. 11 is a perspective view showing the protrusion 250A in the second rotor 22A. FIG. 12 is a cross-sectional view taken along a plane passing through the rotation axis I and is a cross-sectional view passing through a flat portion 244 described later of the recess-side facing surface 242. FIG. 13 is a cross-sectional view taken along a plane passing through the rotation axis I, and is a cross-sectional view passing through an inclined portion 246 described later of the recess-side facing surface 242.

  In the second embodiment, as shown in FIGS. 10 and 11, the connecting portion 70A includes a snap piece 200A provided on the second rotor 22A and a recess 202A (an example of an engaged portion) provided on the first rotor 21A. including. The snap piece 200A of the second rotor 22A is deformable radially inward and has a convex portion 250A protruding radially outward. Similar to the first embodiment described above, in the snap piece 200A, when the second rotor 22A is assembled to the first rotor 21A, the convex portion 250A radially contacts the inner circumferential surface 210A of the first rotor 21A. , Elastically deform to a radially inner position (an example of a second radial position). The snap piece 200A is located at the original radial position (an example of the first radial position) when the convex portion 250A fits into the concave portion 202A at the final stage of assembling the second rotor 22A to the first rotor 21A. It returns radially outward to engage with the recess 202A.

  The recess 202A has a recess-side opposing surface 242 similar to the protrusion-side opposing surface 252 of the protrusion 250 of Example 1 described above on the upper side in the axial direction, and the protrusion 250A corresponds to the through hole 202 of Example 1 described above. The convex-portion-side opposing surface 232 similar to the through-hole-side opposing surface 112 of FIG.

  Specifically, as shown in FIG. 10, the recess-side facing surface 242 has different positions in the circumferential direction between the flat portion 244 (an example of the first flat portion) and the inclined portion 246 (an example of the first inclined portion). Included in The flat portion 244 is a surface whose normal is in the axial direction. The inclined portion 246 is a surface inclined such that the radially outer side is axially lower than the radially inner side. That is, the radially outer side of the inclined portion 246 is lower than the radially inner side at the axial position (the lower side in the axial direction).

  The convex-part-side facing surface 232 includes, as shown in FIG. 11, a flat part 234 (an example of a second flat part) and an inclined part 236 (an example of a second inclined part) at different positions in the circumferential direction. The flat portion 234 is a surface having an axial direction as a normal. The inclined portion 236 is a surface inclined in a direction in which the radially outer side is axially lower than the radially inner side. That is, the radially outer side of the inclined portion 236 is lower than the radially inner side at the axial position (the lower side in the axial direction). The slope aspect of the slope 236 may be the same as the slope 246. That is, the sloped portion 236 and the sloped portion 246 may be substantially parallel.

  The flat portion 234 of the convex side facing surface 232 axially faces the flat portion 244 of the concave side facing surface 242, and the sloped portion 236 of the convex side facing surface 232 corresponds to the sloped portion 246 of the concave side facing surface 242. Opposite in the axial direction. Under the present circumstances, as shown in FIG. 12, the flat part 234 of the convex part side opposing surface 232 and the planar part 244 of the recessed part opposing surface 242 contact | abut in the axial direction in the aspect (plane contacting) which planes meet. . Thereby, rattling to the axial direction lower side of the 2nd rotor 22A to the 1st rotor 21A can be reduced. In this manner, the flat portion 234 of the convex portion side facing surface 232 and the flat portion 244 of the concave side facing surface 242 abut each other, thereby reducing rattling of the second rotor 22A with respect to the first rotor 21A. Do.

  On the other hand, as shown in FIG. 13, the sloped portion 236 of the convex side facing surface 232 and the sloped portion 246 of the concave side facing surface 242 face each other in a slightly separated manner in the axial direction. That is, the sloped portion 236 and the sloped portion 246 oppose each other in a mode of being slightly separated in the axial direction, as shown by the clearance Δ in FIG. The clearance Δ corresponds to a difference in height (a difference in position in the axial direction) between the inner and outer radial directions in the inclined portion 246. In addition, if such a clearance Δ is set, the inclined portion 236 of the convex portion side opposing surface 232 and the inclined portion 246 of the concave portion side opposing surface 242 are not mutually restrained in the axial direction. However, the rattle (later downward movement of the second rotor 22A with respect to the first rotor 21A) caused by the clearance Δ may be caused by the flat portion 234 of the convex portion facing surface 232 and the flat portion 244 of the concave portion facing surface 242. Are prevented by the axial contact as described above. Also in the second embodiment, the radially innermost position of the inclined portion 246 and the radially outermost position of the inclined portion 236 are preferably substantially the same in the axial direction.

  Also in the second embodiment, the same effect as that of the first embodiment described above can be obtained.

  As mentioned above, although each Example was explained in full detail, it is not limited to a specific example, A various deformation | transformation and change are possible within the range described in the claim. In addition, it is also possible to combine all or a plurality of the components of the above-described embodiment.

  Further, in the above-described first embodiment (the same applies to the second embodiment), the flat portion 254 and the inclined portion 256 (the same applies to the flat portion 114 and the inclined portion 116) are adjacent in the circumferential direction, but are limited thereto. Absent. The flat portion 254 and the sloped portion 256 may be spaced apart in the circumferential direction. Therefore, for example, among the sets of snap pieces and protrusions provided in a plurality of circumferential directions, a set of snap pieces and protrusions have only flat portions corresponding to the flat portions 114 and the flat portions 254, and the other The snap piece and the projection of the set may be configured to have only the sloped portion corresponding to the sloped portion 116 and the sloped portion 256. Also in this case, the same effect as that of the first embodiment described above can be obtained.

  Further, in the first embodiment described above (the same applies to the second embodiment), at the snap-fitting position in the axial direction (that is, the outermost position in the radial direction in the inclined portion 116 and the innermost in the radial direction in the inclined portion 256). And the flat portion 114 of the through hole side facing surface 112 are in contact with each other when the positions of (a), (b), and (d) coincide with each other). That is, the flat portion 254 of the convex facing surface 252 and the flat portion 114 of the through hole facing surface 112 are slightly separated in the axial direction at the snap-fit position in the axial direction in consideration of manufacturing errors and the like. You may For example, when the radially outermost position of the inclined portion 116 coincides with the radially innermost position of the inclined portion 256, the flat portion 114 is positioned slightly above the flat portion 254 in the axial direction. It is also good. In this case, since there is a clearance between the inclined portion 116 and the inclined portion 256 in the axial direction at the snap-fit position in the axial direction, the axial direction in which the flat portion 114 and the flat portion 254 abut in the axial direction To the position, the second rotor 22 is lowered axially downward due to gravity. In this case, although it is disadvantageous from the viewpoint of the axial direction rattling of the second rotor 22 with respect to the first rotor 21, when the snap piece 200 is elastically deformed radially inward, the inclined portion 116 and the inclined portion 256 However, the possibility of being caught in the radial direction is further increased, which is advantageous from the viewpoint of connection ability.

DESCRIPTION OF SYMBOLS 1 rotation connector 2 rotor 3 stator 4 flat cable 5 flat cable 8 inner peripheral wall 9 outer peripheral wall 21 first rotor 21 A first rotor 22 second rotor 22 A second rotor 70 connecting portion 112 through hole side facing surface 114 flat portion 116 inclined portion 200 snap piece 200A snap piece 202 through hole 202A concave portion 232 convex side opposing surface 234 flat portion 236 inclined portion 242 concave side opposite surface 244 planar portion 246 inclined portion 250 convex portion 250A convex portion 252 convex side opposite surface 254 planar portion 256 Slope

Claims (5)

A stator, a rotor rotatable relative to the stator, a cable electrically connecting the stator and the rotor, and an axially penetrating space are formed radially inward and circumferentially And an inner circumferential wall extending to the
The rotor includes a first rotor, and a second rotor assembled to the first rotor from an axial first side,
A connecting portion connecting the first rotor and the second rotor and forming a part of the inner circumferential wall;
The connecting portion is provided on the second rotor, and is provided on the first rotor together with a snap piece elastically deformable at a second radial position on the radially inner side of the first radial position, the radial direction An engaged portion engaged with the snap piece in the first position;
The snap piece has a first flat surface portion perpendicular to the axial direction, and a first flat surface portion inclined with respect to the first flat surface portion in a direction in which the radially outer side is the axial first side than the radial inner side With one inclined portion, at different positions in the circumferential direction,
The engaged portion is opposed to the first flat portion in the axial direction with respect to the second flat portion that contacts the first flat portion in the axial direction, and the radial direction inner side with respect to the second flat portion. And a second inclined portion inclined such that the radially outer side is the first axial direction.   The rotary connector according to claim 1, wherein the radially outermost position of the first inclined portion and the radially innermost position of the second inclined portion are substantially the same in the axial direction.   The snap piece has a through hole penetrating in the radial direction, and has a substantially rectangular shape when viewed in the radial direction, and the first flat portion and the first inclined portion have an axis in the through hole. The rotary connector according to claim 1 or 2, formed on the second side of the direction.   The rotary connector according to any one of claims 1 to 3, wherein the first inclined portion and the second inclined portion are substantially parallel and are separated in the axial direction by a predetermined clearance.   The rotary connector according to any one of claims 1 to 4, wherein the first flat surface portion and the first inclined portion are circumferentially adjacent to each other.