Bracket mounting structure

Abstract

The invention provides a bracket mounting structure for detachably mounting a bracket for mounting a radar unit on an outer lens. According to the bracket mounting structure, a bracket is detachably mounted on an outer lens, the outer lens is mounted on a lamp shell, a lamp chamber in which a lamp unit is arranged is formed between the outer lens and the lamp shell, and the outer lens comprises a concave part which is concave towards the lamp shell side and a convex part which is concave towards the lamp shell side; and an engaged section formed on the inner wall of the recess, the bracket being provided with: a bracket main body disposed in the recess; an engagement part which is provided on one end side of the bracket main body and which is inserted into the engaged part; an extension part which extends from the other end side of the bracket main body on the opposite side from the one end side to the outside of the recessed part and is detachably fixed to a mounting object; and at least one spring portion disposed between the rear surface of the bracket body and the bottom surface of the recess.

Description

Technical Field

[0001] The present invention relates to a bracket mounting structure for detachably mounting a bracket for mounting a radar unit on an outer lens. Background Art

[0002] In Japanese Patent Publication No. 2022-001451, a bracket mounting structure is described in which a bracket (support member) for mounting a radar unit is mounted on a housing in a detachable manner (particularly, refer to Japanese Patent Publication No. 2022-001451). Figure 2 The radar unit is used to detect objects by transmitting high-frequency electromagnetic waves (such as millimeter waves) to the vicinity of the vehicle and receiving reflected waves from objects within the transmission range.

[0003] However, Japanese Patent Application Laid-Open No. 2022-001451 does not describe or suggest a bracket mounting structure for detachably mounting a bracket (support member) for mounting a radar unit to an outer lens, and there is room for improvement. Summary of the invention

[0004] The present invention has been made to solve such a problem, and an object of the present invention is to provide a bracket mounting structure for detachably mounting a bracket for mounting a radar unit on an outer lens.

[0005] The bracket mounting structure of the present invention mounts the bracket on the outer lens in a detachable manner, the outer lens being mounted on the lamp housing and constituting a lamp chamber for arranging the lamp unit between the outer lens and the lamp housing, wherein the outer lens includes a recessed portion recessed toward the lamp housing side, the bracket includes a front surface on which the radar unit is detachably mounted and a rear surface on the opposite side thereof, the bracket comprising: a bracket body, which is arranged in the recess in a state in which the rear surface faces the bottom surface of the recess; an extension portion, which extends from the other end side on the opposite side of one end side of the bracket body toward the outside of the recess and is detachably fixed to the mounting object; and at least one spring portion, which is arranged between the rear surface of the bracket body and the bottom surface of the recess, a clamped portion is provided on one of the inner wall of the recess and one end side of the bracket body, and an engaging portion engaged with the clamped portion is provided on the other of the inner wall of the recess and one end side of the bracket body, the spring portion is elastically deformed by the bottom surface of the recess applied to the bracket body side when the engaging portion is engaged with the clamped portion and the extension portion is fixed to the installation object in a loadable and detachable manner, and the engaging portion is engaged with the clamped portion by the reaction force of the elastically deformed spring portion.

[0006] According to such a configuration, it is possible to provide a bracket mounting structure in which the bracket for mounting the radar unit is detachably mounted to the outer lens.

[0007] This is because the bracket body is provided with a locking portion and an extension portion, the locking portion is locked with the locked portion by the reaction force of the elastically deformed spring portion, and the extension portion extends from the other end side of the bracket body to the outside of the recess and is fixed to the mounting object in a detachable manner. Thus, a bracket mounting structure is achieved in which the position of the bracket relative to the outer lens is unlikely to be offset even when vibration (mainly vibration during vehicle driving) is applied.

[0008] In the above bracket mounting structure, the spring portion may be formed integrally with the bracket body by forming a U-shaped through hole penetrating the front surface and the rear surface in the bracket body.

[0009] In addition, in the above-mentioned bracket installation structure, the extension portion may also be configured to elastically deform when the engaging portion is engaged with the engaged portion and the extension portion is fixed to the installation object in a loadable and detachable manner, and the engaging portion is engaged with the engaged portion by the reaction force of the spring portion after the elastic deformation and the reaction force of the extension portion after the elastic deformation.

[0010] Thus, the engaging portion is further forced toward the inner wall of the engaged portion by the reaction force of the elastically deformed extension portion and is fixed in a more firmly engaged state. Thus, a bracket mounting structure is achieved in which the positional displacement of the bracket relative to the outer lens is less likely to occur even when vibration (mainly vibration during vehicle driving) is applied.

[0011] Furthermore, in the above bracket mounting structure, the extension portion may include a bent portion having a U-shaped cross section.

[0012] Furthermore, in the above bracket mounting structure, the bracket body, the engaging portion, the extending portion, and the spring portion may be integrally molded using a synthetic resin having elasticity.

[0013] In addition, in the above-mentioned bracket installation structure, the engaged portion may be a groove portion, the engaging portion may be a protrusion inserted into the groove portion, and the protrusion may be urged toward the inner wall of the groove portion by the reaction force of the spring portion after the elastic deformation and be fixed in a locked state.

[0014] According to the present invention, it is possible to provide a bracket mounting structure in which a bracket for mounting a radar unit is detachably mounted to an outer lens.

[0015] The above and other objects, features and advantages of the present invention will be more fully understood from the detailed description and accompanying drawings given below. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a perspective view of the vicinity of the vehicle lamp 10 mounted on the vehicle.

[0017] Figure 2 is from Figure 1 The view is viewed from the direction of arrow Ar1.

[0018] Figure 3 It is a top view of the vehicle lamp 10 .

[0019] Figure 4 yes Figure 2 AA section view.

[0020] Figure 5 yes Figure 2 BB cross-sectional view.

[0021] Figure 6 It is an exploded perspective view of the vehicle lamp 10 .

[0022] Figure 7 This is a modified example of the groove portion 33 .

[0023] Figure 8 It is a perspective view of the bracket 50 .

[0024] Fig.9A It is a front view of the bracket 50.

[0025] Fig. 9B is a side view of the bracket 50 .

[0026] Fig.10 It is an enlarged perspective view of the bracket 50 and the radome 60 .

[0027] Fig.11A This is a first modification of the bracket 50 .

[0028] Fig. 11B This is a second modification of the bracket 50 . DETAILED DESCRIPTION

[0029] Hereinafter, a vehicle lamp to which a bracket mounting structure according to an embodiment of the present invention is applied will be described with reference to the accompanying drawings. In each of the drawings, the same reference numerals are given to corresponding components, and duplicate descriptions are omitted.

[0030] The vehicle lamp 10 of the present embodiment functions as a headlamp and is mounted on the left and right sides of the front end of a vehicle such as an automobile (not shown). The vehicle lamps 10 mounted on the left and right sides are bilaterally symmetrical, and therefore, the vehicle lamp 10 mounted on the left side of the front end of the vehicle (the left side facing the front of the vehicle) will be described below as a representative.

[0031] Figure 1 is a perspective view of the vicinity of a vehicle lamp 10 mounted on a vehicle. Figure 2 is from Figure 1 The view observed from the direction of arrow Ar1, Figure 3 is a top view of the vehicle lamp 10, Figure 4 yes Figure 2 AA section view, Figure 5 yes Figure 2 BB cross-sectional view, Figure 6 It is an exploded perspective view of the vehicle lamp 10 .

[0032] like Figure 3 to Figure 6 As shown, the vehicle lamp 10 includes a lamp housing 20 (see Figure 5 ), outer lens 30, lamp unit 40, bracket 50, radome 60, radar unit 70. In addition, Figure 1 , Figure 6 Reference numeral 90 in the drawing denotes a bumper. Figure 3 Reference numeral 100 in the drawing denotes a vehicle body.

[0033] The outer lens 30 is mounted on the lamp housing 20, and a lamp chamber in which the lamp unit 40 is arranged is formed between the outer lens 30 and the lamp housing 20. The lamp unit 40 may be of any structure as long as it is a lamp unit that irradiates light and functions as a headlamp. For example, the lamp unit 40 may be a projection type lamp unit, a reflection type lamp unit, a direct projection type (direct type) lamp unit, a lamp unit using a light guide (light guide rod, light guide plate), or other lamp units.

[0034] The outer lens 30 is made of a transparent resin (synthetic resin) such as acrylic acid or polycarbonate, and includes a lens portion 31 through which light irradiated by the lamp unit 40 passes, a recessed portion 32 recessed from the front side to the back side (the lamp housing 20 side), and a groove portion 33 formed on the inner wall 32b (upper inner wall 32b1) of the recessed portion 32 (see FIG. Figure 4 (Enlarged view of the center circle C1). The groove portion 33 is an example of an engaged portion of the present invention.

[0035] The lens portion 31 is disposed on the inner side in the vehicle width direction, and the recessed portion 32 is disposed on the outer side in the vehicle width direction (see Figure 3 The recessed portion 32 is composed of a bottom surface 32a on the back side and inner walls 32b (upper inner wall 32b1, lower inner wall 32b2, inner inner wall 32b3, and outer inner wall 32b4) (see Figure 4 , Figure 6 ).

[0036] The groove 33 is a groove into which the protrusion 52 provided on the upper side of the bracket 50 (the bracket body 51) is inserted. The groove 33 is formed on the inner wall 32b (upper inner wall 32b1) of the recess 32 (see Figure 4Specifically, the groove 33 is formed between a first protrusion 33a on the front surface side and a second protrusion 33b on the rear surface side that protrudes from the inner wall 32b (upper inner wall 32b1). Figure 4 In addition, if Figure 7 As shown, the groove portion 33 may be directly formed on the inner wall 32 b (upper inner wall 32 b 1 ) of the recessed portion 32 . Figure 7 This is a modified example of the groove portion 33 .

[0037] Next, the bracket 50 will be described.

[0038] Figure 8 is a perspective view of the bracket 50, Fig.9A is the main view, Fig. 9B It is a side view.

[0039] like Figure 8 9 , the bracket 50 includes a bracket body 51, a protruding portion 52, an extension portion 53, and a spring portion (first spring portion) 54 (54a, 54b). The bracket 50 is integrally molded from elastic synthetic resin such as PC (polycarbonate), PBT (polybutylene terephthalate), or POS (polyoxymethylene).

[0040] The bracket body 51 includes a radar unit mounting surface 51a (front surface) and a rear surface 51b (refer to Figure 4 The radar unit mounting surface 51a is provided with threaded protrusions 51a1 (three locations) for threaded fastening of the radar unit 70 (see Figure 8 , Fig.9A ).

[0041] The protrusion 52 is provided on the upper side of the bracket body 51 (an example of one end side of the present invention). The protrusion 52 is inserted into the groove 33 formed on the inner wall 32b (upper inner wall 32b1) of the recess 32, and is fixed in a locked state by the first protrusion 33a (inner wall of the groove 33) (refer to Figure 4 The protrusion 52 is an example of an engaging portion of the present invention.

[0042] The extension portion 53 is provided on the lower side (an example of the other end side of the present invention) opposite to the upper side of the bracket body 51. Figure 4 As shown in FIG. 1 , the extension portion 53 extends from the lower side of the bracket body 51 through an elastically deformable U-shaped curved portion C. 53 The (second spring portion) extends downward and is detachably fixed (for example, screwed) to the mounting object 80 outside the recess 32. The mounting object 80 is the lamp housing 20 or the outer lens 30. In addition, the elastically deformable U-shaped curved portion C may be omitted.53 (Second spring portion).

[0043] The spring portion 54 (54a, 54b) is disposed between the rear surface 51b of the bracket body 51 and the bottom surface 32a of the recessed portion 32 (see Figure 5 ). In addition, at least one spring portion 54 is sufficient. The spring portion 54 (54a, 54b) is formed in the bracket body 51 through a U-shaped through hole H penetrating the radar unit mounting surface 51a and the rear surface 51b on the opposite side thereof. 54a , H 54b (Refer to Figure 8 , Fig.9A ) and is formed as one piece with the bracket body 51.

[0044] Specifically, the spring portion 54a includes a fixed portion 54a1 fixed to the bracket body 51, and a spring portion 54a1 extending upward from the fixed portion 54a1 through a bent portion C. 54a The extension portion 54a2 extends upward and toward the bottom surface 32a side of the recessed portion 32. Similarly, the spring portion 54b includes a fixed portion 54b1 fixed to the bracket body 51 and a spring portion 54b2 extending downward from the fixed portion 54b1 and extending through the bent portion C. 54b The extension portion 54b2 extends downward and toward the bottom surface 32a side of the recessed portion 32. The spring portion 54 (54a, 54b) elastically deforms in a state where the extension portion 53 is fixed to the mounting object 80. This point will be described further later.

[0045] The bracket 50 of the above structure is installed in a detachable manner on the outer lens 30 (recess 32). Specifically, first, in a state where the rear surface of the bracket 50 faces the bottom surface 32a of the recess 32 of the outer lens 30, the protrusion 52 formed on the upper side of the bracket body 51 is inserted and engaged with the groove 33 formed on the inner wall 32b (upper inner wall 32b1) of the recess 32. For example, the protrusion 52 is brought into contact with the inner wall of the groove 33 (see Figure 4 Next, the bracket 50 (bracket body 51) is moved in the direction of arrow Ar2 (see FIG. 1 ) with the inserted and engaged protrusion 52 as a fulcrum. Figure 5 ) is rotated. As a result, the spring portion 54 (54a, 54b) and the bottom surface 32a of the recessed portion 32 (the convex portion 32a1 provided on the bottom surface 32a of the recessed portion 32 and protruding toward the bracket 50, see Figure 4 ) contact (refer to Figure 4 ), and further, the spring portion 54 (54a, 54b) and the extension portion 53 (bend portion C 54a ) is elastically deformed, and the extension portion 53 provided on the lower side of the bracket 50 is brought close to the installation object 80 and fixed (for example, screwed) to the installation object 80.

[0046] The spring portion 54 (54a, 54b) is inserted into the groove portion 33 as described above and the extension portion 53 is fixed to the mounting object 80 in a detachable manner. The spring portion 54 is supported by the bottom surface 32a of the recessed portion 32 (the projection 32a1 provided on the bottom surface 32a of the recessed portion 32 and protruding toward the bracket 50, see Figure 4 ) is applied to the bracket body 51 side to elastically deform. Similarly, the extension portion 53 (bend portion C 54a ) The protrusion 52 is inserted into the groove 33 as described above and the extension portion 53 is elastically deformed in a state where it is fixed to the mounting object 80 in a detachable manner.

[0047] At this time, the protrusion 52 is deformed by the reaction force (elastic force) of the spring portion 54 (54a, 54b) elastically deformed as described above and the extension portion 53 (bend portion C) elastically deformed as described above. 54a ) is applied (pressed) by the first protrusion 33a (inner wall of the groove 33) on the front surface side and fixed in a locked state (refer to Figure 4 (enlarged view in the middle circle C1). Thus, a bracket mounting structure is achieved in which the positional displacement of the bracket 50 relative to the outer lens 30 is unlikely to occur even when vibration (mainly vibration during vehicle travel) is applied. In addition, when a load (excessive load) is applied, the load can be dispersed (buffered) by the plurality of spring portions 54a, 54b. As a result, it is possible to prevent the radar unit 70 mounted on the bracket 50 from being applied with a load (excessive load), and to prevent the radar unit 70 from being damaged.

[0048] As described above, the bracket 50 is detachably mounted on the outer lens 30 (the recessed portion 32 ).

[0049] The reason why the upper side (e.g., the protrusion 52) of the bracket 50 (bracket body 51) is not screwed to the outer lens 30 is that it is difficult to ensure space for arranging the threaded protrusion and the bracket fixing screw that is screwed thereto in the recess 32 of the outer lens 30.

[0050] Next, the radome 60 will be described.

[0051] Radome 60 (refer to Fig.10 ) is detachably mounted on the bracket 50 (bracket body 51). For example, the radome 60 is attached to the bracket 50 by a hook 56 (see Fig.10 ) and the like are provided on the protrusion 61 (see Fig.10 ) etc., so as to be mounted on the bracket 50 in a detachable manner.

[0052] Next, the radar unit 70 will be described.

[0053] like Fig.10 As shown, the radar unit 70 (radar device) includes a housing 71, a transmitting antenna and a receiving antenna (not shown) housed in the housing 71, etc. The radar unit 70 is a millimeter wave radar unit that transmits electromagnetic waves (millimeter waves) from the transmitting antenna. The electromagnetic waves (millimeter waves) pass through the radar cover 60 and spread in the vertical direction at an angle θ V (Refer to Figure 5 ), horizontal expansion angle θ H (Refer to Figure 3 ) range. Furthermore, the radar unit 70 receives the reflected wave reflected by the object existing in the transmission range and transmitted through the radar cover 60 through the receiving antenna. The received signal is processed by a control device, such as an ECU (Electronic Control Unit) not shown, to detect the object (the distance to the object, the angle, the speed). In the radar unit 70, for example, millimeter waves in the 76 GHz-81 GHz band, in particular, millimeter waves in the 79 GHz band are used, but it is not limited to this band.

[0054] In addition, the radar mode of the radar unit 70 may be any one of a pulse mode, a CW (Continuous Wave) mode, or other modes. In addition, the antenna mode of the radar unit 70 may be any one of a mechanical scanning mode, a beam switching mode, a phased array mode, a digital shaping mode, or other modes.

[0055] The radar unit 70 of the above structure is mounted on the bracket 50 (bracket body 51) in a detachable manner. Fig.10 As shown, the radar unit 70 is mounted on the bracket 50 (bracket body 51) by screwing a screw N1 inserted into the flange portion 72 of the radar unit 70 into the threaded protrusion 51a of the radar unit mounting surface 51a of the bracket 50 while the rear surface thereof is opposite to the radar unit mounting surface 51a of the bracket 50. Fig.10 It is an enlarged perspective view of the bracket 50 and the radome 60 .

[0056] As described above, according to the present embodiment, it is possible to provide a bracket mounting structure in which the bracket 50 for mounting the radar unit 70 (and the radome 60 ) is detachably mounted to the outer lens 30 .

[0057] This is achieved by providing the protruding portion 52 and the extended portion 53 (the elastically deformable U-shaped curved portion C is omitted). 53In the case of the second spring portion), the protrusion 52 is fixed in a locked state by being urged by the first protrusion 33a (inner wall of the groove 33) on the front surface side by the reaction force (elastic force) of the spring portion 54 (54a, 54b) elastically deformed as described above (see Figure 4 (see the enlarged view within the circle C1 in FIG. 1 ), the extension portion 53 extends downward from the lower side of the bracket body 51 and is fixed (for example, screwed) to the installation object 80 outside the recess 32 in a manner that allows for loading and unloading. Thus, the bracket 50 can be firmly mounted on the outer lens 30 (recess 32) in a manner that allows for loading and unloading without using screws or the like. As a result, a bracket mounting structure is achieved in which it is difficult for the bracket 50 to shift in position relative to the outer lens 30 even when vibration (mainly vibration during vehicle driving) is applied. In addition, when a load (excessive load) is applied, the load can be dispersed (buffered) using multiple spring portions 54a, 54b. As a result, it is possible to prevent a load (excessive load) from being applied to the radar unit 70 mounted on the bracket 50, and to prevent the radar unit 70 from being damaged.

[0058] According to the present embodiment, the extension portion 53 (bend portion C) elastically deformed as described above 54a ) by the reaction force (elastic force), the protrusion 52 is further urged by the first protrusion 33a (inner wall of the groove 33) on the front surface side and is fixed in a more firmly locked state (a U-shaped curved portion C that can be elastically deformed is provided). 53 (Second spring portion)). Thus, the bracket 50 can be more firmly attached to the outer lens 30 (recess 32) in a removable manner without using screws or the like. As a result, a bracket mounting structure is achieved in which the position of the bracket 50 relative to the outer lens 30 is less likely to be displaced even when vibration (mainly vibration during vehicle travel) is applied. In addition, by providing a U-shaped curved portion C that can be elastically deformed on the basis of the spring portion (first spring portion) 54, the bracket 50 can be more securely attached to the outer lens 30 (recess 32) in a removable manner without using screws or the like. As a result, a bracket mounting structure is achieved in which even when vibration (mainly vibration during vehicle travel) is applied, the position of the bracket 50 relative to the outer lens 30 is less likely to be displaced. 53 (Second spring portion) Even if the number of spring portions 54 is reduced, a large reaction force (elastic force) can be obtained. As a result, the size of the bracket 50 can be reduced.

[0059] Next, modified examples will be described.

[0060] In the above embodiment, the bracket body 51 is provided with a U-shaped curved portion C that is elastically deformable from the lower side thereof. 53 An example in which one extended portion 53 extends downward is described, but the present invention is not limited to this.

[0061] For example, Fig.11A As shown, multiple extensions 53 may also be used. Fig.11A This is a first modification of the bracket 50 .

[0062] In addition, in the above embodiment, the groove 33 is formed on the inner wall 32b (upper inner wall 32b1) of the recess 32, and the protrusion 52 inserted into the groove 33 is provided on the upper side of the bracket body 51, but the present invention is not limited to this. For example, the groove 33 (not shown) may be formed on the inner wall 32b (inner inner wall 32b3) of the recess 32, such as Fig. 11B As shown, the protrusion 52 to be inserted into the groove 33 is provided on the inner side of the bracket body 51 in the vehicle width direction. Fig. 11B This is a second modification of the bracket 50 .

[0063] In addition, in the above-mentioned embodiment, the example in which the groove portion 33 (an example of the engaged portion of the present invention) is provided on the inner wall 32b (upper inner wall 32b1) of the recessed portion 32, and on the other hand, the protrusion 52 (an example of the engaging portion of the present invention) inserted into (engaged with) the groove portion 33 is provided on one end side of the bracket body 51 is described, but the present invention is not limited thereto. Although not shown in the figure, it is also possible to conversely provide the protrusion 52 (an example of the engaging portion of the present invention) on the inner wall 32b (upper inner wall 32b1) of the recessed portion 32, and on the other hand, provide the groove portion 33 (an example of the engaged portion of the present invention) into which the protrusion 52 is inserted (engaged) on one end side of the bracket body 51.

[0064] The numerical values ​​shown in the above-mentioned embodiments are all examples, and it is of course possible to use appropriate numerical values ​​different from them.

[0065] The above-mentioned embodiments are merely illustrative in all aspects. The present invention is not to be interpreted restrictively by the description of the above-mentioned embodiments. The present invention can be implemented in various other forms without departing from the spirit or main features thereof.

[0066] It is obvious from the invention thus described that the embodiments of the invention may be varied in a number of ways. Such variations should not be considered as departing from the spirit and scope of the invention, and it is obvious to those skilled in the art that all such modifications are intended to be included within the scope of the appended claims.

Claims

1. A bracket mounting structure, wherein the bracket is mounted on an outer lens in a detachable manner, the outer lens is mounted on a lamp housing, and a lamp chamber in which a lamp unit is arranged is formed between the outer lens and the lamp housing, wherein: The outer lens includes a recessed portion that is recessed toward the lamp housing side. The bracket includes a front surface on which the radar unit is detachably mounted and a rear surface on the opposite side thereof, and the bracket includes: a bracket body arranged in the recessed portion with the rear surface facing the bottom surface of the recessed portion; an extension portion extending from the other end side on the opposite side of the one end side of the bracket body toward the outside of the recessed portion and detachably fixed to the mounting object; and at least one spring portion disposed between the rear surface of the bracket body and the bottom surface of the recessed portion, An engaged portion is provided on one of an inner wall of the recess and one end of the bracket body. An engaging portion that engages with the engaged portion is provided on the other of the inner wall of the recess and the one end side of the bracket body. The spring portion is elastically deformed by being urged toward the bracket body by the bottom surface of the recessed portion in a state where the engaging portion is engaged with the engaged portion and the extension portion is detachably fixed to the mounting object. The engaging portion is engaged with the engaged portion by a reaction force of the elastically deformed spring portion.

2. The bracket mounting structure according to claim 1, wherein: The bracket body is provided with a U-shaped through hole that passes through the front surface and the rear surface, so that the spring portion is formed integrally with the bracket body.

3. The bracket mounting structure according to claim 1, wherein: The extension portion is configured to be elastically deformed in a state where the engagement portion is engaged with the engaged portion and the extension portion is detachably fixed to the attachment object. The engaging portion is engaged with the engaged portion by a reaction force of the elastically deformed spring portion and a reaction force of the elastically deformed extended portion.

4. The bracket mounting structure according to claim 3, wherein: The extension portion includes a bent portion having a U-shaped cross section.

5. The bracket installation structure according to any one of claims 1 to 4, wherein: The bracket body, the engaging portion, the extending portion, and the spring portion are integrally molded using a synthetic resin having elasticity.

6. The bracket mounting structure according to claim 1, wherein: The engaged portion is a groove portion, The engaging portion is a protrusion inserted into the groove portion, The protrusion is urged toward the inner wall of the groove portion by the reaction force of the elastically deformed spring portion and is fixed in a locked state.

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