Two-member assembly structure

Abstract

To provide a two-member assembly structure in which, when a main body portion of a first member and a fitting portion of a second member are fitted to each other and then relatively rotated to assemble them together, the main body portion and a boss can be relatively rotated after the fitting depth between them has been brought to a level equal to or greater than a predetermined depth.SOLUTION: In a fitted state where a main body portion 10 and a boss 21 are fitted to a predetermined depth, a free-end side of an elastic piece 15 is in an elastically deformed state where it is pushed out by a restriction-release portion 22, so that a locking portion 15A is separated from a facing clearance S2. In this state, by performing a rotational assembly operation, the locking portion 15A passes over a rotation-restriction portion 23, so that relative rotation between the main body portion 10 and the boss 21 proceeds, and a first member 1 and a second member 2 can be fixed.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a two-piece assembly structure. [Background technology]

[0002] Patent Document 1 describes a two-member assembly structure in which the main body of a first member is fitted in the axial direction with a boss (fitting portion) protruding upward from the main surface of a second member, aligning their axes and positions around the axis, and then rotating the first member around the axis of the boss of the second member in this fitted state, thereby fixing the two members in a state where they are prevented from coming out in the opposite direction to the fitting direction. Here, by rotating the first member around the axis of the boss of the second member, biting edges provided on the inner peripheral surface of the main body of the first member bite into the outer peripheral surface of the boss of the second member, thereby forming a two-member assembly structure that prevents coming out in the opposite direction to the fitting direction.

[0003] Such a first member can be an assembly member (clip) having an engaging portion on a main body for assembling to a separate member different from the second member. In this case, a plurality of first members of the same shape are prepared, and they are assembled to a plurality of bosses provided on a second member forming a base member. Then, the separate member is assembled to the engaging portions of the first members, so that the second member and the separate member (third member) can be assembled via the first members.

[0004] However, in this case, if the fitting depths of the main body of the first member and the boss (fitting portion) of the second member are not uniform, the positions (heights) of the engaging portions of the first members will not be uniform when another member (third member) is assembled, which could disrupt the assembled state of the other member. Such unevenness and variation in fitting depth is a problem that occurs in conventional assembly structures in which two interlocked members are assembled by relative rotation, and is not limited to first members (clips) that have engaging portions such as those described above. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5214377 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a two-member assembly structure that allows the body portion of the first member and the fitting portion of the second member to be fitted together and then rotated relative to each other, and that allows the body portion and the boss to be rotated relative to each other while maintaining a fitting depth of at least a certain level.

[0007] The two-member assembly structure for solving the above problem comprises: A two-member assembly structure in which a main body portion of a first member (e.g., an assembly member such as a clip) is fitted to a fitting portion of a second member (e.g., a base member) in the direction of the aligned axis after aligning their axes and aligning their positions around the aligned axis, and in this fitted state, the aligned axis is used as a rotation axis, and a rotational assembly operation is performed in which the first member and the second member are rotated relatively around the rotation axis, thereby engaging and fixing the two members, one of the first member and the second member includes a restriction release portion and a rotation restricting portion that face each other around the rotation axis in the fitted state, and the other member includes an elastic piece that extends from a fixed end toward the rotation restricting portion, beyond the restriction release portion, in a cantilevered state around the rotation axis in the fitted state; the elastic piece has a locking portion on its free end side that faces the restriction release portion and the rotation restriction portion (along the direction of the rotation axis) when in the fitted state, When the engagement between the main body portion and the engagement portion has progressed until the locking portion has entered the opposing gap and has not yet been engaged to a predetermined depth in the direction of the rotation axis, when the rotation assembling operation is performed in a predetermined rotation direction around the rotation axis toward the rotation regulating portion, the locking portion engages with the rotation regulating portion, stopping the relative rotation between the main body portion and the engagement portion and preventing the first member and the second member from being fixed together, When the engagement progresses further and the main body portion and the engagement portion are engaged to a predetermined depth in the direction of the rotation axis to reach the engaged state (completed engagement state), the free end side of the elastic piece is pushed out by the restriction release portion into an elastically deformed state, causing the locking portion to disengage from the opposing space, and by performing the rotation assembly operation in the predetermined rotation direction in this state, the locking portion passes over the rotation restriction portion (goes beyond the rotation restriction portion), and the relative rotation of the main body portion and the engagement portion progresses, and the first member and the second member engage and are fixed.

[0008] According to the above configuration, when the main body of the first member is fitted into the fitting portion of the second member, if the fitting is made to a predetermined depth, the rotational assembly operation becomes possible and the first member and the second member can be fixed, whereas if the fitting is not made to the predetermined depth, the rotational assembly operation is prevented and the first member and the second member cannot be fixed. Therefore, the fitting depth between the main body of the first member and the fitting portion of the second member can be reliably maintained at a certain level or more.

[0009] The main body portion and the mating portion can each be provided with a linear opposing portion whose tip ends form a straight line and are arranged approximately parallel and closely opposed to each other when viewed from the direction of the rotation axis in the mated state.

[0010] According to the above configuration, when the main body part and the fitting part are fitted together, the linear opposing parts are parallel and closely opposed when viewed from the direction of the rotation axis (the axes that coincide with each other), so that the positions of the main body part and the fitting part around the rotation axis can be easily aligned. If the linear opposing parts are not approximately parallel and closely opposed, the positions around the rotation axis will be misaligned, and the linear opposing parts will interfere with each other when fitted together, preventing them from fitting together.

[0011] The elastic piece has a pressed surface that is pressed against the pressing surface of the deregulation portion when the main body portion and the mating portion are mated to a predetermined depth in the direction of the rotation axis, and these pressing surface and pressed surface can be formed so as to extend (expand) in a direction perpendicular to the mating direction in the natural state (non-elastically deformed state) of the elastic piece (they can be formed as surfaces on a plane perpendicular to the mating direction).

[0012] With this configuration, there is no risk of the main body and mating part rotating relative to each other around the rotation axis when the deregulation part presses against the elastic piece. For example, if the pressing surface of the deregulation part is inclined around the rotation axis, the elastic piece will slide downward to release the force when pressed against it. If this sliding occurs, the position around the rotation axis that was aligned before mating will shift, resulting in assembly failure. With the above configuration, such failure will not occur.

[0013] The engaging portion can be an inclined surface that slopes downward toward the free end side of the elastic piece, in the opposite direction to the extrusion direction of the elastic piece by the release portion, and that is adjacent to the pressed surface on the free end side of the elastic piece when the elastic piece is in its natural state.

[0014] According to the above configuration, when the elastic piece is pushed out by the restriction release portion, the locking portion rotates (pivots) with the pressed surface (pressing position) of the elastic piece as the rotation fulcrum so that the free end side of the elastic piece is lifted. As the locking portion rotates (pivots), the free end side (the side farther from the pressed surface) is farther from the rotation fulcrum and therefore the lifting distance (pushing distance) is longer, and the side opposite the free end (the side closer to the pressed surface) is closer to the rotation fulcrum and therefore the lifting distance (pushing distance) is shorter. By forming the surface of the locking portion adjacent to the pressed surface on the free end side as an inclined surface that slopes downward toward the rotation regulating portion side, the locking portion can be formed with a long portion in the opposite direction to the extrusion direction on the free end side, which has a longer lift distance, so that relative rotation (rotational assembly operation) can be reliably prevented when the engagement is in progress, and the entire locking portion can be formed so that when the elastic piece is pushed out and rotates (pivots), it quickly rises to a predetermined position (a position around the rotation axis that does not interfere with the rotation regulating portion, or a position that can overcome interference if it does interfere).

[0015] the other member has a positioning locking portion that protrudes radially from the rotation axis on the fixed end side of the elastic piece, the one member has a rotation stopper portion formed adjacent to the rotation restricting portion in a radial direction relative to the rotation axis, When the rotational assembly operation is performed in the fitted state, the positioning locking portion and the rotation preventing portion lock around the rotation axis, and the first member and the second member engage and are fixed at that locking position.

[0016] According to the above configuration, the fixed positions of the first and second members around the rotation axis can be determined by the engagement between the positioning locking portion and the rotation preventing portion. The positioning locking portion is provided on the elastically deformable elastic piece, but by forming it on the fixed end side, it is less susceptible to elastic deformation and can be reliably engaged with the rotation preventing portion.

[0017] The locking portion and the deregulation portion can be shaped so that when the relative rotation between the first member and the second member is performed in the opposite direction to the rotational assembling operation (predetermined rotation direction) in the intermediate fitting state, they lock with each other and stop the relative rotation. This allows the rotation restricting portion and the deregulation portion to prevent misalignment of the first member and the second member about the rotation axis in the intermediate fitting state, allowing the fitting to continue stably. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a perspective view showing an assembly member and a base member according to the first embodiment. [Figure 2] FIG. 2 is a bottom view of the assembly member of FIG. 1; [Figure 3] FIG. 2 is a plan view of the base member of FIG. 1; [Figure 4] 2 is a perspective view showing a state in which the assembly member and the base member in FIG. 1 are halfway fitted together; FIG. [Figure 5] Enlarged view of part A1 in Figure 4. [Figure 6] Front view of Figure 4. [Figure 7] 2 is a perspective view showing a state in which the assembly member and the base member in FIG. 1 are completely fitted together. FIG. [Figure 8] Enlarged view of part A2 in Figure 7. [Figure 9] Front view of Figure 7. [Figure 10] 8 is a perspective view for explaining a reverse rotation operation in the mating completed state of FIG. 7. FIG. [Figure 11] 2 is a perspective view showing a fixed state (two-member assembly structure) of the assembly member and the base member in FIG. 1; FIG. [Figure 12] Front view of Figure 11. [Figure 13] FIG. 10 is a cross-sectional view showing the B1-B1 cross section of FIG. [Figure 14] FIG. 13 is a cross-sectional view showing the B2-B2 cross section of FIG. [Figure 15] 15 is a cross-sectional view showing a state in which a separate member is assembled to an assembly member in the fixed state (two-member assembly structure) of FIG. 14. [Figure 16] FIG. 10 is a front view showing an assembly member and a base member of a second embodiment. [Figure 17] 17 is a front view showing the state in which the assembly member and the base member in FIG. 16 are fixed (two-member assembly structure). FIG. [Figure 18] FIG. 10 is a cross-sectional view showing a fitted state of an assembly member and a base member according to a third embodiment. [Figure 19] FIG. 10 is a front view showing an assembly member and a base member of a fourth embodiment. [Figure 20] 20 is a front view showing the state in which the assembly member and the base member of FIG. 19 are fixed together (two-member assembly structure). FIG. [Figure 21] FIG. 21 is a cross-sectional view showing the C1-C1 cross section of FIG. 20. [Figure 22] FIG. 10 is a diagram illustrating another embodiment. [Figure 23] FIG. 13 is a perspective view showing an assembly member and a base member of a fifth embodiment. [Figure 24] FIG. 24 is a bottom view of the assembly member of FIG. 23; [Figure 25] FIG. 24 is a plan view of the base member of FIG. 23. [Figure 26] 24 is a front view showing the assembly member and the base member of FIG. 23 in an intermediate state of fitting together. [Figure 27] FIG. 27 is a partially enlarged perspective view of the first engagement portion of FIG. 26. [Figure 28] 24 is a front view showing the completed fitting state of the assembly member and the base member in FIG. 23. FIG. [Figure 29] FIG. 29 is a partially enlarged perspective view of the first engagement portion of FIG. 28. [Figure 30] 13A and 13B are diagrams illustrating the assembly of an assembly member and a base member according to a sixth embodiment. [Figure 31] Figure continues from Figure 30. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0020] The two-member assembly structure 100 of the first embodiment is a structure in which the main body 10 of the assembly member 1 (first member) and the boss 21 (engagement portion, assembly portion) of the base member 2 (second member) shown in FIG. 1 are aligned with each other's axes Z1 and Z2 (coincident axes) and aligned around the axes Z1 and Z2, and then engaged in the direction of the coincident axes Z1 and Z2 (see FIGS. 7 to 9). In this engaged state, the axes Z1 and Z2 are set as a rotation axis Z3, and a rotational assembly operation is performed in which the assembly member 1 and the base member 2 are rotated relative to each other around the rotation axis Z3, whereby the two members 1 and 2 are fixed in an engaged state in a direction opposite to the engagement direction I and are prevented from coming loose (see FIGS. 11 and 12).

[0021] The base member 2 (second member) is an injection-molded resin body. As shown in Fig. 1, the base member 2 integrally includes a plate-shaped main portion 20 and a boss 21 (protruding portion) that protrudes upward from one main surface 20a of the main portion 20.

[0022] A plurality of retaining supports 26 are provided at predetermined intervals around the axis Z2 on the outer peripheral surface of the boss 21. The retaining supports 26 here are formed in a form that protrudes outward on both sides of the outer peripheral surface of the boss 21 in a predetermined direction Y2 perpendicular to the axis Z2. Specifically, each retaining support 26 is a group of ridges made up of a plurality of ridges (here, three ridges) that extend parallel to the direction of the axis Z2 on the outer peripheral surface of the boss 21.

[0023] The boss 21 here extends in a tubular (cylindrical) shape in the direction of its own axis Z2, and forms an insertion hole portion having an insertion hole 21h (insertion hole) that opens upward.

[0024] 1 and 3, the base member 2 includes a deregulation portion 22 and a rotation restricting portion 23 that face each other around the axis Z2 (circumferential direction). The deregulation portion 22 and the rotation restricting portion 23 here are protrusions that rise upward from the main surface 20a. The rotation restricting portion 23 here is part of the rib 21L1 of the boss 21. On the other hand, the deregulation portion 22 is an independent protrusion that is not connected to the boss 21.

[0025] The base member 2 has a rotation stopper portion 24 formed adjacent to the rotation restricting portion 23 in the radial direction relative to the axis Z2. The rotation stopper portion 24 here is a part of the rib 21L1, and is formed integrally with the rotation restricting portion 23 in a manner continuing in the radial direction (here, outside the rotation restricting portion 23). The rotation stopper portion 24 here is higher than the rotation restricting portion 23, and the rib 21L1 has a stepped shape (L-shape) that rises outward in the radial direction relative to the axis Z2.

[0026] The base member 2 has an auxiliary rotation preventing portion 25 provided on the opposite side of the rotation preventing portion 23 from the restriction release portion 22 around the axis Z2 (circumferential direction), and at a predetermined distance (section L: see FIG. 3) from the rotation preventing portion 23. The auxiliary rotation preventing portion 25 here is a rib 21L2 of the boss 21, and is provided at a different position from the ribs 21L1 (23, 24) around the axis Z2.

[0027] The base member 2 here has the above-mentioned derestriction portion 22, rotation restricting portion 23, and auxiliary rotation stop portion 25, in this order, in a predetermined circumferential direction R1 around the axis Z2 (the predetermined rotation direction R1 described below). As shown in FIG. 3 , the gap S2 between the derestriction portion 22 and the rotation restricting portion 23 around the axis Z2 is narrower than the section L from the auxiliary rotation stop portion 25 to the rotation restricting portion 23. The base member 2 here has multiple sets (two sets in this case) of the derestriction portion 22, the rotation restricting portion 23, and the auxiliary rotation stop portion 25 aligned in the predetermined circumferential direction R1, in a positional relationship that has rotational symmetry around the axis Z2. The base member 2 here has ribs 21L1 (23, 24) and ribs 21L2 (25) alternately arranged at 90-degree intervals around the axis Z2, and has the derestriction portion 22 midway from rib 21L2 to rib 21L1 in the predetermined circumferential direction R1.

[0028] The assembly member 1 (first member) is an injection-molded resin body, although either the assembly member 1 or the base member 2 may be made of metal.

[0029] 1, the assembly member 1 has a main body 10 that fits onto the boss 21 (protrusion), a plurality of retaining portions 11 formed at predetermined intervals around the axis Z2 toward the surface (here, the outer circumferential surface) facing the fitted boss 21, and engaging portions 12 for engaging with a separate member 3 (third member) different from the base member 2. The assembly member 1 here is a clip that is attached to the separate member 3 (see FIG. 15) by the engaging portions 12.

[0030] The main body 10 is a roughly cylindrical portion into which the boss 21 is inserted, and integrally comprises a peripheral wall 10A formed around the axis Z1 (circumferential direction), a bottom wall 10B formed at one end (lower side) of the peripheral wall 10A in the direction of the axis Z1, a ceiling wall 10C formed at the other end (upper side) of the peripheral wall 10A in the direction of the axis Z1, and an insertion shaft 10D extending (downward) from the ceiling wall 10C inside the peripheral wall 10A toward one end (lower side) in the direction of the axis Z1.

[0031] The peripheral wall 10A is a wall formed continuously or intermittently around the axis Z1 (circumferential direction). The peripheral wall 10A here is made up of opposing walls 10A, 10A on either side of the axis Z1. The peripheral walls 10A are shaped to face each other in a predetermined width direction X1 that is perpendicular to the axis Z1. The boss 21 inserted into the main body 10 is accommodated between the opposing opposing walls 10A, 10A from one end side in the direction of the axis Z1 (the lower side in FIG. 1).

[0032] The bottom wall 10B is formed to be connected to the peripheral wall 10A (opposing walls 10A, 10A) and has a shape that is long in the width direction X1 (here, the opposing direction of the opposing walls 10A, 10A). The bottom wall 10B here is annular, with a through hole 10h formed in the center to receive the boss 21, and is connected to the peripheral wall 10A (opposing walls 10A, 10A) at both ends in the width direction X1 (see FIG. 2).

[0033] The ceiling wall portion 10C is formed in a shape connected to the peripheral wall portion 10A (opposing walls 10A, 10A) and has a shape that is long in the width direction X1 (here, the opposing direction of the opposing walls 10A, 10A). The ceiling wall portion 10C here is connected to the peripheral wall portion 10A (opposing walls 10A, 10A) at both ends in the width direction X1. An insertion shaft portion 10D extending toward one end side in the direction of the axis Z1 (the lower side in FIG. 1) and an engagement portion 12 extending toward the other end side in the direction of the axis Z1 (the upper side in FIG. 1) are connected to the center of the ceiling wall portion 10C through which the axis Z1 passes.

[0034] The fitting shaft portion 10D (fitting shaft portion) is a portion that is inserted (fitted) into the insertion hole 21h of the boss 21 when fitting the boss 21 into the main body portion 10. The fitting shaft portion 10D has a cylindrical shape, and when inserted into the insertion hole 21h of the boss 21, the axes Z1 and Z2 are aligned and the fitting shaft portion 10D is rotatable around the aligned axis Z1 and Z2 (rotation axis Z3).

[0035] A plurality of retaining portions 11 are provided at predetermined intervals around the axis Z1 on the inner peripheral surface of each peripheral wall portion 10A to correspond to the retaining support portions 26, 26 of the boss 21. The retaining portions 11 here are provided inwardly protruding on each of the opposing surfaces (inner peripheral surfaces) of the opposing wall portions 10A, 10A. Specifically, the retaining portions 11 here are cutting portions (biting blades) that protrude inward with a certain width around the axis Z1 on the opposing surfaces of the opposing wall portions 10A, 10A, and a plurality (three in this case) of the retaining portions 11 are provided side by side in the direction of the axis Z1.

[0036] When the main body 10 of the assembly member 1 is fitted to the boss 21 of the base member 2 (see FIGS. 7 to 9), the retaining portions 11 and the retaining support portions 26 are in a positional relationship (see FIG. 13) where they do not face each other around the mutually coincident axes Z1, Z2 (Z3). However, when a rotational assembly operation is performed in which the main body 10 and the boss 21 are rotated relative to each other around the axes Z1, Z2 (Z3), the retaining portions 11 and 26 are brought into a positional relationship where they face each other (see FIG. 14). At this time, the retaining portions 11 and the retaining support portions 26 approach each other and enter a pressure state (engaged state). This prevents the main body 10 and the boss 21 from moving in the directions of the axes Z1 and Z2, and the assembly member 1 and the base member 2 are fixed together. Here, as shown in Figures 14 and 15, the blade portion forming the retaining portion 11 bites into and presses the group of protrusions forming the retaining support portion 26, thereby preventing the main body portion 10 and the boss 21 from coming out, and fixing the assembly member 1 and the base member 2 together.

[0037] As shown in FIG. 1, the engagement portion 12 has a pillar portion 12A that protrudes coaxially with the axis Z1 from the ceiling wall portion 10C of the main body portion 10 toward the other end (upper side) in the direction of the axis Z1, engagement elastic pieces 12B that extend from multiple locations around the axis Z1 on the tip side of the pillar portion 12A so as to fold back in the opposite direction (lower side) on the outer periphery of the shaft portion 12A, and an engagement support portion 12D that extends from the base end side of the pillar portion 12A or from both ends of the ceiling wall portion 10C in the width direction X1 toward the other end in the direction of the axis Z1.

[0038] The engagement and assembly of the engaging portion 12 and the separate member 3 will be described with reference to FIG. 15 . The engaging portion 12 here is engaged with and assembled to the separate member 3 by inserting the engaging elastic piece 12B together with the pillar portion 12A into a through-hole 3H provided in the plate-shaped separate member 3. Specifically, during insertion, the engaging elastic piece 12B is pressed by the inner wall of the through-hole 3H so as to approach the pillar portion 12A (axis Z1), causing it to elastically deform. This pressing force is released when the outer protrusion 12C of the engaging elastic piece 12B passes through the through-hole 3H, and with this release, the engaging elastic piece 12B elastically returns (it does not have to return to its natural state) and spreads away from the pillar portion 12A (axis Z1) again. This separation results in the engaged and assembled state shown in FIG. 15 . 15, the outer protrusion 12C of the engaging elastic piece 12B wraps around to the rear side of the through-hole 3H in the insertion direction (upper side in FIG. 15) and engages with the through-hole peripheral portion 3R from the rear side, while the engaging support portion 12D is not inserted into the through-hole 3H and engages with the separate member 3 from the front side in the insertion direction (lower side in FIG. 15). As a result, the separate member 3 is in an engaged and assembled state where it is sandwiched from above and below between the engaging elastic piece 12B and the engaging support portion 12D. In this engaged and assembled state, the assembly member 1 can slide and rotate relative to the separate member 3 about the axis Z1.

[0039] The engagement and assembly of the engaging portion 12 to the separate member 3 may be performed after the assembly member 1 is fixed to the base member 2, or may be performed before the assembly member 1 is fixed to the base member 2. The assembly structure 100 of this embodiment may be in a state where the assembly member 1 is either fixed to the base member 2 or not. Furthermore, the engagement and assembly of the engaging portion 12 to the separate member 3 may be performed by a method different from that described above.

[0040] 1, the assembly member 1 includes a first-side elastic piece 15 extending in a cantilevered manner around the axis Z1 from a first side toward a second side (in a circumferential direction R1) and having a first-side locking portion 15A (locking portion) at its free end, and a second-side elastic piece 16 extending in a cantilevered manner around the axis Z1 from the second side toward the first side (in a direction opposite to the circumferential direction R1) and having a second-side locking portion 16A at its free end facing the first-side locking portion 15A across a gap S1. The elastic pieces 15, 16 are connected to an elastic piece connecting portion 10E extending from the main body 10 and are supported in a cantilevered manner by the connecting portion 10E. A plurality of elastic pieces 15, 16 are provided in a positional relationship having rotational symmetry about the axis Z1. Specifically, as shown in Fig. 2, two pairs of elastic pieces 15, 16 are formed with their tips (locking portions 15A, 16A) facing each other across a gap S1 around the axis Z1, and these extend in arcs in opposite directions around the axis Z1. Note that each elastic piece connection portion 10E here has an axial connection portion 10E1 (see Fig. 1) extending from the peripheral wall portion 10A (opposing wall portions 10A, 10A) to one end side (lower side) in the direction of the axis Z1, and a radial connection portion 10E2 (see Fig. 2) extending radially outward from the bottom wall portion 10B.

[0041] Here, a method for fixing the assembly member 1 to the base member 2 will be described.

[0042] First, preparations are made for fitting the boss 21 of the base member 2 into the main body 10 of the assembly member 1. Specifically, as shown in Fig. 1, the axes Z1 and Z2 of the main body 10 and the boss 21 are aligned (coincident), and their positions around the coincident axes Z1 and Z2 (axis Z3) are aligned.

[0043] The alignment of the axes Z1 and Z2 is achieved by fitting the fitting shaft portion 10D of the main body 10 into the insertion hole 21h (fitting hole) of the boss 21 (FIGS. 1 to 4). The fitting shaft portion 10D of the main body 10 and the insertion hole portion (fitting hole portion) that forms the periphery of the insertion hole 21h (see FIG. 1) of the boss 21 function as an axis alignment means (axis coincidence means) for aligning the axes Z1 and Z2.

[0044] As shown in FIG. 13 , alignment around axis Z3, which is the axis along which axes Z1 and Z2 coincide, is achieved by aligning the tips 11 a, 27 a of the retaining portion 11 (here, the cutting edge portion) of the main body 10 and the fitting side surface portion 27 of the boss 21, which does not have the retaining support portion 26 (here, the ridge group), so that they are substantially parallel to and closely opposed to each other when viewed from the direction of axis Z3. Here, the retaining portion 11 and the fitting side surface portion 27 are linearly opposed portions, with the tips 11 a, 27 a of both being linear when viewed from the direction of axis Z3. The retaining portion 11 and the fitting side surface portion 27 function as alignment means around the axis for aligning the positions of the main body 10 and the boss 21 around axis Z3. If they are not aligned correctly, the tips 11 a, 27 a will interfere with each other, and the main body 10 and the boss 21 will not be able to approach each other (will not be able to be fitted together) in the direction of axis Z3.

[0045] Next, the main body 10 and the boss 21, whose axes Z1 and Z2 are aligned and whose positions are aligned around the aligned axes Z1 and Z2 (Z3), are brought closer together along the direction of the axis Z3 to begin mating (FIGS. 1 → 4 → 7). Note that the axis Z3 will be referred to as the rotation axis Z3 hereinafter. This mating moves the first locking portion 15A (locking portion) toward the opposing space S2 between the restriction release portion 22 and the rotation restricting portion 23 along the direction of the rotation axis Z3 (Z1, Z2) (rotation axis direction).

[0046] As the fitting progresses, as shown in Fig. 4, the first locking portion 15A (locking portion) enters the opposing space S2 between the restriction release portion 22 and the rotation restriction portion 23. However, the state in Fig. 4 is an intermediate fitting state in which the main body 10 and the boss 21 have not yet been fitted to a predetermined depth in the direction of the rotation axis Z3. Specifically, this intermediate fitting state is a state in which a space SI (see Fig. 6) exists between the top wall portion 10C of the main body 10 and the tip of the boss 21 in the direction of the rotation axis Z3, and there is room for the main body 10 and the boss 21 to be brought closer together.

[0047] Consider the case where, in this intermediate mating state (FIG. 4), the main body 10 is rotated relative to the boss 21 in a predetermined rotational direction R1 (see FIG. 1) about the rotational axis Z3 for assembly. The predetermined rotational direction R1 is the direction in which the first-side locking portion 15A (locking portion) moves around the rotational axis Z3 (Z1, Z2) toward the rotation restricting portion 23 (the rotation restricting portion 23 that forms the opposing space S2 toward which the first-side locking portion 15A faces at the start of mating). When the rotational assembly is performed in this intermediate mating state (FIG. 4), the first-side locking portion 15A, which has entered the opposing space S2 between the restriction release portion 22 and the rotation restricting portion 23, has its locking surface 15a come into contact with and lock into the rotation restricting portion 23, as can be seen in FIGS. 5 and 6, preventing relative rotation between the main body 10 and the boss 21. This interrupts the rotational assembly operation, and the assembly member 1 and the base member 2 cannot be fixed together.

[0048] As the mating progresses further, the free end of the first-side elastic piece 15 comes into contact with (close to) the deregulation portion 22, as shown in Fig. 4. As the mating progresses further, the free end of the first-side elastic piece 15 is pushed out by the deregulation portion 22, as shown in Fig. 7, and the first-side elastic piece 15 begins to elastically deform (Fig. 5 → Fig. 8). Here, as the mating progresses, the first-side locking portion 15A on the free end of the first-side elastic piece 15 is pushed up higher in the direction opposite to the mating direction I (downward in Figs. 4 to 9).

[0049] When the main body 10 and the boss 21 are fitted to a predetermined depth in the direction of the rotation axis Z3, they reach the fitted state (completed fitting state) shown in Fig. 7. Specifically, as shown in Fig. 9, the main body 10 and the boss 21 are fitted to a predetermined depth in which the top wall portion 10C and the tip of the boss 21 abut (or closely face) in the direction of the rotation axis Z3.

[0050] In the mated state (complete mating state: FIGS. 7 to 9), the free end of the first-side elastic piece 15 is pushed out by the deregulation portion 22 and elastically deformed. As a result, the first-side locking portion 15A, which had entered the opposing space S2 between the deregulation portion 22 and the rotation restricting portion 23 in the intermediate mating state (FIGS. 4 to 6), is pushed out of the opposing space S2 in the direction opposite to the mating direction I (upward in FIGS. 4 to 9), and disengages from the opposing space S2. In this state, by performing a rotational assembly operation on the main body 10 relative to the boss 21 in the predetermined rotational direction R1 about the rotation axis Z3, the first-side locking portion 15A passes over the rotation restricting portion 23 (goes past the rotation restricting portion 23), and the relative rotation between the main body 10 and the boss 21 progresses (FIGS. 7, 9 → FIG. 11, FIG. 12). As a result, the assembly member 1 and the base member 2 reach a predetermined fixing position around the rotation axis Z3 without interrupting the rotation assembly operation, and are engaged and fixed at that position.

[0051] When the main body 10 and the boss 21 are rotated relative to each other to a predetermined fixed position by a rotational assembly operation, the retaining portion 11 and the retaining support portion 26 interfere with each other around the rotation axis Z3, preventing the relative rotation (FIG. 13). However, this does not mean that relative rotation is impossible; rather, as the operating force of the rotational assembly operation increases, the retaining portion 11 and the retaining support portion 26 press against (engage with) each other, causing the relative rotation to proceed (FIG. 13 → FIG. 14). At the fixed position, the retaining portion 11 and the retaining support portion 26 press against each other (engaged state: FIG. 14), preventing the main body 10 and the boss 21 from moving in the opposite direction to the mating direction I. Here, the retaining portion 11, which forms a cutting portion, bites into the retaining support portion 26, which forms a group of ridges (see FIGS. 14 and 15), preventing the main body 10 and the boss 21 from moving apart in the opposite direction to the mating direction I.

[0052] This rotational assembly operation is continued until the positioning locking portion 17 and the rotation preventing portion 24 are locked around the rotation axis Z3, and this locked position is the fixed position (FIGS. 11, 12, and 14). That is, at this fixed position, the retaining portion 11, which forms the cutting edge, is engaged with the retaining support portion 26, which forms the group of ridges, to establish a retaining state (engaged state) (FIGS. 14 and 15). The positioning locking portion 17 here is a plate-like portion that extends radially from the fixed end side of the elastic piece 15 (specifically, the elastic piece connecting portion 10E) relative to the rotation axis Z3. The positioning locking portion 17 and the rotation preventing portion 24 function as rotation stopping means that stop the relative rotation of the assembly member 1 and the base member 2 at a predetermined fixed position when the rotational assembly operation is performed in the fitted state.

[0053] Now, consider the case where, in the above-described mated state (mating completion state: FIGS. 7 to 9), the main body 10 is reversely rotated relative to the boss 21 in a direction R2 opposite to the predetermined rotation direction R1 about the rotation axis Z3, as shown in FIG. 10. When this reverse rotation is performed, the lower edge 16az of the locking surface 16a of the second-side locking portion 16A comes into contact with and locks with the rotation restricting portion 23, thereby preventing rotation of the main body 10 in the reverse direction R2 relative to the boss 21. Therefore, the second-side elastic piece 16 (second-side locking portion 16A) and the rotation restricting portion 23 function as a reverse rotation preventing means for preventing reverse rotation in the mated state.

[0054] Before the main body 10 and the boss 21 are mated, alignment around the aligned axes Z1, Z2 (Z3) is primarily achieved by the relative positions of the retaining portion 11 and the mating side surface 27, which form linear opposing portions. However, this alignment is also achieved by sandwiching the rotation restricting portion 23 in the gap S1 between the locking portions 15A and 16A. However, this alignment is an auxiliary means (an auxiliary means for aligning around the axis). As shown in FIG. 6, the gap S1 between the locking portions 15A and 16A is wider on the first locking portion 15A side to ensure a rotational (pivoting) path when the deregulation portion 22 pushes out (pushes up) the first locking portion 15A. Therefore, even when the rotation restricting portion 23 is sandwiched in the gap S1 between the locking portions 15A and 16A, some misalignment around the aligned axes Z1, Z2 (Z3) is permitted.

[0055] Additionally, the first-side elastic piece 15 here has a pressed portion 15P adjacent to the fixed end side of the first-side locking portion 15A at the free end. This pressed portion 15P has a pressed surface 15p that is pressed against a pressing surface 22p of the deregulation portion 22 when the main body portion 10 and the boss 21 are fitted to a predetermined depth. Of the pressed surface 15p and the pressing surface 22p (here, both), at least the pressing surface 22p extend in a direction perpendicular to the fitting direction I (parallel to the direction of the axis Z3) (they extend / expand so as not to incline with respect to the fitting direction I) when the elastic piece 15 is in a non-pressing state (the natural state of the elastic piece 15, a non-elastically deformed state). As a result, when the main body 10 and the boss 21 are fitted together, the contact and pressing between the pressed surface 15p and the pressing surface 22p encourages the main body 10 and the boss 21 to rotate relative to each other around the rotation axis Z3, preventing positional misalignment.

[0056] Furthermore, the first-side locking portion 15A and the rotation restricting portion 23 are shaped to lock with each other and prevent relative rotation between the main body 10 and the boss 21 when a rotational assembly operation (an operation of rotating the main body 10 in a predetermined rotational direction R1) is performed in the intermediate mating state (see FIG. 5). The first-side locking portion 15A here has, as the locking surface 15a (tip-facing locking surface), a vertical surface (the tip surface of the elastic piece 15) that rises along the mating direction I so as to face the rotation restricting portion 23 around the axis Z1 in the intermediate mating state where the main body 10 and the boss 21 are mated to a predetermined depth in the direction of the rotation axis Z3 (FIGS. 4 to 6: the elastic piece 15 is in its natural state). This ensures that the rotational assembly operation (R1) of the main body 10 and the boss 21 in the intermediate mating state is prevented reliably by the locking of the rotation restricting portion 23 with the locking surface 15a.

[0057] In this embodiment, the first-side locking portion 15A and the deregulation portion 22 are also shaped so that they lock with each other and stop their relative rotation when an operation is performed in the opposite rotation direction (R2) to the rotational assembly operation (R1) in the intermediate mating state (see FIG. 5). Here, the first-side locking portion 15A has, as the locking surface 15b (locking surface facing the base end), an upright surface (the distal end surface of the elastic piece 15) that rises along the mating direction I so as to face the deregulation portion 22 around the axis Z1 in the intermediate mating state (FIGS. 4 to 6: the elastic piece 15 is in its natural state). As a result, even if an operation (R2) that rotates the main body 10 and the boss 21 in the opposite direction to the rotational assembly operation (R1) in the intermediate mating state is performed, the locking surface 15b reliably prevents this from happening due to the locking between the rotation restricting portion 23 and the locking surface 15b. The first locking portion 15A of this embodiment has a rectangular parallelepiped shape with locking surfaces 15a and 15b on the front and back sides, and protrudes in the fitting direction I beyond the second locking portion 16A.

[0058] The first-side elastic piece 15 here has an elastic piece portion 15B extending in an arc around the axis Z1 from the fixed end, a pressed portion 15P protruding (bulging) at its tip (free end) in the mating direction I, and a first-side locking portion 15A protruding further at its tip (free end) in the mating direction I. When the first-side elastic piece 15 is pushed out by the deregulation portion 22 during mating, the free end undergoes elastic deformation, with the free end being pushed up in the direction opposite to the mating direction I (see FIG. 8 ). This positions the first-side locking portion 15A on the opposite side of the mating direction I from the tip of the rotation restricting portion 23, allowing relative rotation of the main body 10 relative to the boss 21 in the rotation direction R1. As this relative rotation progresses, the position at which the deregulation portion 22 presses the first-side elastic piece 15 moves from the pressed portion 15P protruding in the mating direction I toward the elastic piece portion 15B. As a result, the first side elastic piece 15 is no longer pushed out (contacted) by the restriction release portion 22, the free end side of the first side elastic piece 15 returns to its natural state, and relative rotation continues in that state.

[0059] Furthermore, the second-side elastic piece 16 does not undergo any particular elastic deformation when the main body 10 and the boss 21 are fitted together. The second-side elastic piece 16 has an elastic piece portion 16B extending in an arc around the axis Z1 from the fixed end side, and a second-side locking portion 16A that protrudes further in the fitting direction I at its tip (free end). The second-side locking portion 16A has a shape that protrudes more in the fitting direction I toward the free end, and the surface on the fitting direction I side forms an inclined surface 16b that descends linearly in the fitting direction I toward the free end, and the free end beyond that forms an upright surface 16a that rises in the opposite direction to the fitting direction I, forming an overall right-angled triangle shape. When a rotational assembly operation (operation of rotating the main body 10 in the rotation direction R1) is performed after the main body 10 and the boss 21 are in a mated state (complete mating state) (FIGS. 7 to 11, 13 to 14), the inclined surface 16b of the second-side elastic piece 16 slides on the auxiliary rotation stopper 25 and is pushed out, causing elastic deformation (not shown), just before the main body 10 and the boss 21 reach a predetermined fixed position. The second-side elastic piece 16 then elastically returns to a position where it has overcome the auxiliary rotation stopper 25. With this elastic return, the main body 10 and the boss 21 reach the fixed position and are fixed. Due to this elastic return, the second-side locking portion 16A turns toward the rear of the auxiliary rotation stopper 25 in the predetermined rotation direction R1 (see FIG. 14).

[0060] Meanwhile, the first-side elastic piece 15 is released from the extrusion by the restriction release portion 22 and elastically returns to its original position, with the first-side locking portion 15A facing the auxiliary rotation stopper 25 (21L2) (see FIG. 14). That is, the auxiliary rotation stopper 25 enters the gap S1 between the first-side locking portion 15A (locking surface 15a) and the second-side locking portion 16A (vertical surface 16a) (see FIG. 14). This function serves as an auxiliary rotation stopper (auxiliary rotation stopper) to stop the relative rotation between the main body 10 and the boss 21 at the fixed position. However, because the gap S1 between the locking portions 15A and 16A is wide as described above, this function only serves as an auxiliary means for stopping the relative rotation at the fixed position. Meanwhile, the locking portion 15A and the auxiliary rotation stopper 25 function as a means for preventing the relative rotation between the main body 10 and the boss 21 from going beyond the fixed position.

[0061] The first embodiment of the present invention has been described above, but this is merely an example, and the present invention is not limited to this. Various modifications, such as additions and omissions, can be made based on the knowledge of those skilled in the art, as long as they do not deviate from the spirit of the claims. Below, modifications and other embodiments of the above embodiment will be described. The above embodiment and the following example can be combined as appropriate within the scope of the claims.

[0062] The intermediate engagement state is not limited to the positions shown in Figures 4 to 6, and may be any position in which the first side locking portion 15A (locking portion) has entered the opposing space S2 and there is still room for the main body portion 10 and the boss 21 to approach each other in the direction of the rotation axis Z3.

[0063] The mated state (complete mated state) is not limited to the state shown in Figures 7 to 9, as long as the first side elastic piece 15 is elastically deformed after passing through an intermediate mated state, the first side locking portion 15A (locking portion) is released from the opposing space S2, and the rotational assembly operation can be performed without being hindered by the rotation restricting portion 23.

[0064] In the first embodiment, the first member of the present invention is the assembly member 1, the second member having the boss (fitting portion) is the base member 2, the member (one of the members of the present invention) having the deregulation portion 22 and the rotation restricting portion 23 is the base member 2, and the member (the other member of the present invention) having the elastic piece 15 is the assembly member 1, but the first member of the present invention may also be the base member 2, and the second member having the boss (fitting portion) may also be the assembly member 1. Also, as in a second embodiment shown in Figures 16 and 17, the assembly member 1 may be provided with the deregulation portion 22 and the rotation restricting portion 23 (and also with an auxiliary rotation preventing portion 25), and the base member 2 may be provided with a first-side elastic piece 15 (elastic piece) having a first-side locking portion 15A (locking portion) and a second-side elastic piece 16 having a second-side locking portion 16A. In the case of Figures 16 and 17, the deregulation portion 22, the rotation regulation portion 23, and the auxiliary rotation stop portion 25 are formed to protrude in the same shape as in the first embodiment from the bottom wall portion 10B, which is formed in a flange shape in the main body portion 10, and the elastic pieces 15, 16 are connected to the elastic piece connection portion 20E protruding from the main portion 20.

[0065] 16 shows the state in which the axes Z1 and Z2 of the base member 2 constituting the first member and the assembly member 1 constituting the second member coincide with each other and the state in which they are aligned about the axes Z1 and Z2 (Z3). FIG. 17 shows the state (completed engagement state) in which the assembly is completed after the state in FIG. 16, in which the free end side (locking portion 15A) of the first elastic piece 15 is pushed out from the opposing space S2 by the restriction release portion 22, enabling a rotational assembly operation (an operation of moving the locking portion 15A toward the rotation restriction portion 23 (direction R1) about the rotation axis Z3). When the rotational assembly operation is performed from the state in FIG. 17, the base member 2 and the assembly member 1 are fixed together (assembly structure 100) (not shown).

[0066] In the first embodiment, the radial inside-outside relationship of the coincident axes Z1, Z2 during mating is such that the main body 10 is on the outside and the boss 21 forming the mating portion is on the inside, but the opposite may be true, as in a third embodiment shown in Fig. 18, where the main body 10 (fitting shaft portion 10D) is on the inside and the mating portion 21 (boss) is on the outside, thereby preventing disengagement due to relative rotation after mating (rotation of the main body 10 in the predetermined rotation direction R1). Here, the axes Z1, Z2 are aligned by fitting the core portion 21I of the mating portion 21 into the cylindrical main body 10 (fitting shaft portion 10D) during mating.

[0067] In the first embodiment, the retaining portion 11, which is a blade portion, and the retaining support portion 26, which is a group of ridges, form a fixed state (two-component assembly structure 100) in which the main body 10 and the boss 21 are fixed in a state that prevents them from coming off in the opposite direction of the mating direction I. However, this fixed state may be achieved by other methods. Alternatively, a group of ridges (ridges) may be provided on the main body 10 as the retaining portion 11, and a blade portion may be provided on the boss 21 as the retaining support portion 26, with the blade portion serving as the retaining support portion 26 engaging with the group of ridges (ridges) serving as the retaining portion 11 (see FIG. 18 ). When forming a group of ridges, the ridges do not need to be parallel to each other or oriented along the rotation axis Z3. Furthermore, retaining may be achieved in a manner other than by the blade portion engaging with the group of ridges.

[0068] In the first embodiment, the fitting portion is a boss 21 protruding from the main portion 20. However, instead of the boss 21, a hole 21H such as a through-hole or a blind hole in the main portion 20 may be used as the fitting portion, as in a fourth embodiment shown in FIGS. 19 to 21. In this case, the main body 10 may be provided with a fitting shaft 10D (fitting shaft) that fits into the hole 21H. Here, as shown in FIG. 21, the hole 21H forming the fitting portion has a blind hole having a substantially elliptical cross section and a core 21I extending through the center of the hole 21H along the axis Z2 of the hole 21H. The main body 10 has a flange-shaped base 10BC and the fitting shaft 10D forming the fitting portion. The fitting shaft portion 10D is provided with a blade-shaped anti-slip portion 11 that protrudes outward from both sides of the long diameter of the approximately elliptical hole portion 21H when the axes are aligned and aligned around the axis (see solid line in Figure 21), and when the fitting shaft portion 10D is fitted and the rotational assembly operation (R1) is performed, the blade-shaped anti-slip portion 11 bites into the inner wall portions on both sides of the short diameter of the approximately elliptical hole portion 21H that forms the anti-slip support portion 26, forming a fixed anti-slip state (see dashed line in Figure 21).

[0069] In the first embodiment, the deregulation portion 22, the rotation restricting portion 23, and the auxiliary rotation stopper 25 are formed to protrude from the flat main surface 20a of the main portion 20, but as shown in FIGS. 19 to 21, the opposing space S2 and the section L may be formed as recesses in the main portion 20. For example, as shown in FIGS. 19 and 20, the opposing space S2 is formed as a recess 20S (see FIG. 21) that forms an arc-shaped groove extending about the axis Z2, with the wall portion that forms one of the vertical surfaces about the axis Z2 being the deregulation portion 22, and the wall portion that forms the other vertical surface being the rotation restricting portion 23. In the section L, a recess 20L (see FIG. 21) that forms an arc-shaped groove extending about the axis Z2 is formed, with the wall portion that forms one of the vertical surfaces about the axis Z2 being the auxiliary rotation stopper 25, and the wall portion that forms one of the vertical surfaces about the axis Z2 being the rotation restricting portion 23. The recess 20L includes a fixed-position first-side recess 20M at one end around the axis Z2 that accommodates the first-side locking portion 15A when the assembly member 1 and the base member 2 are fixed to each other at the end when the rotational assembly operation is complete. Furthermore, a fixed-position second-side recess 20N (see FIG. 21) that accommodates the second-side locking portion 16A at the fixed position is formed beyond the auxiliary rotation stopper 25 around the axis Z2 from the recess 20L. In this case, in the intermediate mating state (FIG. 19), the first-side locking portion 15A enters the recess 20S, making the rotational assembly operation (R1) impossible. Meanwhile, in the mated state (completed mating state: FIG. 20), the free end of the first-side elastic piece 15 is pushed upward, making the rotational assembly operation (R1) possible.

[0070] Although not shown, the subsequent rotation assembling operation (R1) proceeds from the state in which the first-side elastic piece 15 is pushed up ( FIG. 20 ). As the operation proceeds, the first-side elastic piece 15 returns to its natural state with the first-side locking portion 15A entering the recess 20L (see FIG. 21 ) and moving within the recess 20L toward the auxiliary rotation stopper 25 (see FIG. 21 ). Just before the first-side locking portion 15A reaches the fixed position, the second-side locking portion 16A is pushed up by the wall portion constituting the auxiliary rotation stopper 25 and overcomes the auxiliary rotation stopper 25 by sliding the inclined surface 16b on the wall portion. As the second-side locking portion 16A overcomes the auxiliary rotation stopper 25, it elastically returns to its original position and is accommodated in a recess (fixed position second-side recess 20N: see FIG. 21 ) beyond the wall portion constituting the auxiliary rotation stopper 25. This accommodation position of the second-side locking portion 16A is the fixed position between the assembly member 1 and the base member 2. On the other hand, when the second-side locking portion 16A reaches the fixed position, the first-side locking portion 15A is located at the second end around the axis Z2 in the recess 20L (fixed position first-side recess 20M: see FIG. 21). At this time, the auxiliary rotation stopper 25 is located in the gap S1 between the locking portions 15A and 16A (locking surfaces 15a and 16a) and faces them, preventing rotation of the main body 10 in both directions (R1 and R2) relative to the boss 21.

[0071] 22(a) to 22(f) are schematic diagrams showing various modified examples (first to sixth modified examples) of the present invention. As can be seen from these examples, the present invention requires only that the first side elastic piece 15 be present, and the second side elastic piece 16 may be omitted. Furthermore, the first side elastic piece 15 may be a single piece rather than multiple pieces, may not have an arcuate shape, and may not be formed at the outermost periphery. On the other hand, the set of the rotation restricting portion 23, the restriction releasing portion 22, the rotation stopping portion 24, and the auxiliary rotation stopping portion 25 may be a single set rather than multiple sets, and either or both of the rotation stopping portion 24 and the auxiliary rotation stopping portion 25 may be omitted.

[0072] 23 to 29 show a fifth embodiment of the present invention. The fifth embodiment is basically the same as the first embodiment, but differs mainly in the shapes of the first side elastic piece 15, the second side elastic piece 16, the deregulation portion 22, and the rib 21L1.

[0073] As shown in Fig. 24, the first-side elastic piece 15 of the fifth embodiment is cantilevered around the axis Z1 and connected to the first-side elastic piece connection portion 10E, extends around the axis Z1 toward the second side (toward the circumferential direction R1), has a pressed portion 15P (pressed surface 15p: see Fig. 26) in the middle section, and has a first-side locking portion 15A (locking portion) at its free end. The second-side elastic piece 16 is cantilevered around the second-side elastic piece connection portion 10E, extends around the axis Z1 toward the first side (toward the direction R2 opposite to the circumferential direction R1), and has a second-side locking portion 16A at its free end. These points are the same as those of the first embodiment.

[0074] However, as shown in Figures 26 to 29, the elastic pieces 15, 16 of the fifth embodiment have an inclined shape that slopes downward in the mating direction I toward the free end. The locking portions 15A, 16A of each elastic piece 15, 16 have an increased slope on the surfaces 15c, 16c (see Figures 26 and 28) on the far side in the mating direction I. The tip surfaces 15a, 16a of each elastic piece 15, 16 are vertical surfaces that rise along the mating direction I and function as locking surfaces 15a, 16a, similar to the first embodiment.

[0075] 26 to 29, the deregulation portion 22 of the fifth embodiment has a right-angled triangular shape having an inclined upper surface 22a (see FIGS. 26 and 28) that slopes downward in the mating direction I around the axis Z2 toward the rotation restricting portion 23, and protrudes from the plate-shaped main portion 20. The top surface of the deregulation portion 22 (the surface at the top facing away from the mating direction I: see FIGS. 27 and 29) functions as a pressing surface 22p, similar to the first embodiment.

[0076] Moreover, unlike the first embodiment, the rib 21L1 of the fifth embodiment is formed only with a rotation restricting portion 23 extending radially relative to the axis Z2, and does not have a rotation stopping portion 24. The positioning locking portion 17 that locks with the rotation stopping portion 24 in the first embodiment does not exist in the fifth embodiment.

[0077] In the fifth embodiment, the method for fixing the assembly member 1 to the base member 2 is the same as that in the first embodiment. That is, the main body portion 10 of the assembly member 1 is aligned with the fitting portion 21 of the base member 2 with respect to the axes Z1 and Z2 and their positions around the axes Z1 and Z2 (FIG. 23), and then the assembly member 1 is fitted to the fitting portion 21 of the base member 2 along the aligned axes Z1 and Z2 (FIG. 23 → FIG. 26 → FIG. 28). In this fitted state (fitting completed state: FIG. 28), the aligned axes Z1 and Z2 are set as the rotation axis Z3 (Z1, Z2), and a rotational assembling operation (R1) is performed to rotate the assembly member 1 around the rotation axis Z3 in a predetermined rotational direction R1 relative to the base member 2, whereby the two members 1 and 2 are engaged and fixed together, thereby forming the two-member assembly structure 100 (see FIGS. 9 → 12).

[0078] However, also in the fifth embodiment, when the rotation assembling operation (R1) is performed in the intermediate fitting state (FIG. 26), the locking portion 15A locks with the rotation restricting portion 23, stopping the relative rotation between the main body portion 10 and the fitting portion 21, and preventing the assembly member 1 from being fixed to the base member 2. When the rotation assembling operation (R1) is performed in a fitted state (completed fitting state: FIG. 28) in which the fitting progresses further from the intermediate fitting state and the main body portion 10 and the fitting portion 21 are fitted to a predetermined depth in the direction of the rotation axis Z3, the free end side of the elastic piece 15 is pushed out by the restriction release portion 22 and elastically deformed, and the locking portion 15A is released from the opposing space S2, making it possible to perform the rotation assembling operation (R1). Therefore, by performing the rotational assembly operation (R1) in the above-described mated state (complete mating state: FIG. 28), the locking portion 15A passes over the rotation restricting portion 23, and the relative rotation between the main body portion 10 and the mating portion 21 progresses to a predetermined fixed position, and the assembly member 1 and the base member 2 are engaged and fixed (see FIGS. 9 → 12). On the other hand, in both the intermediate mating state (FIG. 26) and the mated state (complete mating state: FIG. 28), when the main body portion 10 is reverse-rotated relative to the boss 21 in the opposite direction R2 to the predetermined rotational direction R1 about the rotation axis Z3, the locking portion 16A locks with the rotation restricting portion 23, and the reverse rotation does not progress any further.

[0079] Since there is no rotation stopper 24 or positioning locking portion 17, the rotational assembly operation after the base member 2 and the assembly member 1 are fitted together is stopped by the auxiliary rotation stopper 25 sandwiched in the gap S1 between the locking portions 15A and 16A (see FIGS. 13 and 14). Therefore, in the fifth embodiment, the auxiliary rotation stopper 25 serves as the main rotation stopper. That is, the locking portions 15A and 16A and the rotation stopper 25 function as a rotation stop means for stopping the relative rotation between the assembly member 1 and the base member 2 at a predetermined fixed position.

[0080] 30 and 31 show a sixth embodiment of the present invention. In the sixth embodiment, the assembly member 1 has the same shape as that of the first embodiment, and the base member 2 also has basically the same shape as that of the first embodiment. The sixth embodiment differs from the first embodiment in that a dedicated jig 9 is used to fix the assembly member 1 to the base member 2.

[0081] The jig 9 used in the sixth embodiment has a cylindrical container portion 90 and a rotation operation portion (operation handle) 91. The axis Z9 is the axis of the jig 9.

[0082] As shown in Figure 31, the cylindrical accommodating portion 90 accommodates the assembly member 1 that is in a partially fitted state with the base member 2, with their axes Z3 and Z9 aligned, and the accommodating opening 90h (see Figure 30) opens to one side of its own axis Z9.

[0083] The rotation operation unit 91 is provided so as to be capable of performing a pushing operation to push the assembly member 1 housed in the cylindrical accommodating portion 90 downward (in the fitting direction I) along the axis 9 to a predetermined height in the cylindrical accommodating portion 90 (until the assembly member 1 is fully fitted to the base member 2), and a rotating operation to rotate the assembly member 1 in the cylindrical accommodating portion 90 in a predetermined rotation direction R1 about the axes Z3 and Z9 relative to the base member 2 after the pushing operation. The rotation operation unit 91 here integrally includes an engagement shaft 91Z that protrudes along the axis Z9 while penetrating the ceiling of the cylindrical accommodating portion 90 and connects to the assembly member 1 in the cylindrical accommodating portion 90 after the pushing operation to form an engaged state in which relative rotation about the axes Z3 and Z9 is restricted, and a handle portion 91S that is attached above the cylindrical accommodating portion 90 so as to be perpendicular to the engagement shaft 91Z.

[0084] The base member 2 of the sixth embodiment differs from the first embodiment in that, in addition to the structure of the first embodiment, a jig fitting portion 29 is formed to protrude from the main portion 20. The jig fitting portion 29 is fitted into the accommodation opening 90h of the cylindrical accommodation portion 90, thereby easily aligning the axes Z3 (Z1, Z2) and Z9. As shown in Fig. 30, the jig fitting portion 29 is formed as an arc-shaped protruding wall portion that protrudes intermittently or continuously from the main portion 20 in the circumferential direction around the axis Z2.

[0085] According to the sixth embodiment, first, the assembly member 1 and the base member 2 are brought into an intermediately fitted state, and then the assembly member 1 in the intermediately fitted state is housed in the cylindrical housing portion 90, and the jig fitting portion 29 of the base member 2 is fitted into the housing opening 90h of the cylindrical housing portion 90 (FIGS. 30 → 31). In this jig fitted state, the rotation operation portion 91 is pressed down as described above. This brings the assembly member 1 and the base member 2 into an engaged state (completed engagement state) (FIGS. 1 → 4 → 7). Then, after this pressing down operation, the rotation operation portion 91 is rotated as described above. This brings the assembly member 1 into a rotation assembly operation in which the assembly member 1 is rotated relative to the base member 2 in the predetermined rotation direction R1, and the assembly member 1 and the base member 2 are engaged and fixed (see FIGS. 7 → 11). In other words, by performing pressing and rotating operations using the jig 9, the assembly member 1 and the base member 2 are fixed in place in the sixth embodiment in the same procedure as in the first embodiment (Figure 1 → Figure 4 → Figure 7 → Figure 11).

[0086] By using the jig 9, the member 1 to be assembled can be reliably fitted into the base member 2 by a pressing operation, and the member 1 to be assembled can be stably rotated while preventing the axis 3 from tilting during a rotation operation. [Explanation of symbols]

[0087] 100 Two-member assembly structure 1. Assembly member (first member) 10 Main body 10D Inset shaft part 11. Anti-slip portion (linear opposing portion) 12 Engagement portion 15 First side elastic piece (elastic piece) 15A First side locking part 15P Pressed part 16 Second side elastic piece 16A Second side locking part 17 Positioning locking part 2 Base member (second member) 20 Main Section 21 Boss (fitting part) 22 Deregulation Department 23 Rotation control part 24 Rotation stopper 25 Auxiliary rotation stopper 26 Anti-slip support part 27 Fitting side portion (linear opposing portion) 3 Separate parts I Mating direction R1 Prescribed rotation direction R2: Reverse direction of the specified rotation direction R1 S1 Gap S2 Opposite side X1 Width direction (opposite direction) Y2 Specified direction Z1 Axis of the main body Z2 Axis of boss (fitting part) Z3 rotation axis (coincident with axes Z1 and Z2)

Claims

1. A two-member assembly structure in which the main body of the first member is fitted to the fitting portion of the second member in the direction of the coincident axis after aligning their axes and aligning their positions around the axes, and in this fitted state, the coincident axis is used as a rotation axis, and a rotational assembly operation is performed in which the first member and the second member are rotated relatively around the rotation axis, thereby engaging and fixing the two members, one of the first member and the second member includes a restriction release portion and a rotation restricting portion that face each other around the rotation axis in the fitted state, and the other member includes an elastic piece that extends from a fixed end toward the rotation restricting portion, beyond the restriction release portion, in a cantilevered state around the rotation axis in the fitted state; The elastic piece has a locking portion on a free end side thereof that faces the restriction release portion and the rotation restriction portion when in the fitted state, a rotation restricting portion that restricts the relative rotation of the main body portion and the fitting portion to a predetermined depth in the direction of the rotation axis, and the first member and the second member cannot be fixed to each other. However, when the fitting of the main body portion and the fitting portion progresses until the locking portion enters between the opposing portions and in an intermediate fitting state where the fitting has not yet been fitted to a predetermined depth in the direction of the rotation axis, the locking portion engages with the rotation restricting portion, stopping the relative rotation of the main body portion and the fitting portion, and preventing the first member from being fixed to the second member.

2. 2. The two-member assembly structure according to claim 1, wherein the main body portion and the mating portion are each provided with a linear opposing portion whose tip ends are arranged in a straight line, approximately parallel and closely opposed to each other when viewed from the direction of the rotation axis in the mated state.

3. 2. A two-component assembly structure as described in claim 1, wherein the elastic piece has a pressed surface that is pressed against the pressing surface of the deregulation portion when the main body portion and the mating portion are mated to a predetermined depth in the direction of the rotation axis, and the pressing surface and the pressed surface extend in a direction perpendicular to the mating direction when the elastic piece is in its natural state.

4. The two-component assembly structure described in claim 3, wherein the engaging portion has a surface adjacent to the free end side of the elastic piece relative to the pressed surface when the elastic piece is in its natural state, and the surface forms an inclined surface that slopes downward toward the free end side in the opposite direction to the extrusion direction of the elastic piece by the release portion.

5. 2. The two-member assembly structure according to claim 1, wherein the locking portion and the deregulation portion are shaped so that when the relative rotation between the first member and the second member in the intermediate engagement state occurs in a direction opposite to the rotational assembly operation, the locking portion and the deregulation portion lock together and stop the relative rotation.

6. the other member has a positioning locking portion that protrudes radially from the rotation axis on the fixed end side of the elastic piece, the one member has a rotation stopper portion formed adjacent to the rotation restricting portion in a radial direction relative to the rotation axis, 2. The two-member assembly structure according to claim 1, wherein when the rotational assembly operation is performed in the fitted state, the positioning locking portion and the rotation preventing portion lock around the rotation axis, and the first member and the second member engage and are fixed at that locking position.

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