JP2013059138A - Assembly including lock mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an assembly including a lock mechanism which reduces the risk of the damage of the lock mechanism, achieves more stable holding force, and has a new structure.SOLUTION: A lock mechanism 16 is formed so as to include an insertion engagement frame 24 which protrudes from an outer wall 20 of a first member 12 to form an insertion hole 30 between itself and the outer wall 20 and an engagement part 38 which is provided at a second member 14 and is inserted into the insertion hole 30 thereby engaging with the insertion engagement frame 24. Further, locking claws 50, 50 of a pair of locking protruding pieces 40a, 40b formed at the engagement part 38 are engaged with connection parts 26, 26 which are connected to the outer wall 20 at the insertion engagement frame 24.

Description

  The present invention relates to an assembly component including a lock mechanism in which a first member and a second member are fixed to each other by a lock mechanism, and in particular, an engagement formed in an insertion hole formed in the first member. The present invention relates to an assembly component including a lock mechanism that is inserted through the portion and engaged with the first member.

  2. Description of the Related Art Conventionally, assembly parts including a lock mechanism in which a first member and a second member are fixed to each other, such as a harness protector that inserts and protects an automobile wire harness, are used in various fields. For example, the harness protector has a main body as a first member and a cover as a second member as described in JP-A-5-252634 (Patent Document 1), and the wire harness is accommodated in the main body. In this state, the cover is covered with the opening of the main body and fixed to each other by the lock mechanism, so that the wire harness is accommodated and protected between the main body and the cover.

  By the way, as described in Patent Document 1, as such a lock mechanism, the first member protrudes from the outer wall of the first member and forms a through hole with the outer wall. The insertion engagement frame is formed. On the other hand, the second member is formed with a protruding piece-shaped engaging portion, and a locking claw is formed at the protruding tip of the engaging portion. And an engaging part is penetrated by the said insertion hole in an insertion engagement frame, and a latching claw is locked mutually by engaging with an insertion engagement frame.

  However, in the structure described in Patent Document 1, the locking claw is formed by thickening the tip of the engaging portion. Therefore, when the engaging portion is inserted through the insertion hole, the opposing wall portion facing the outer wall of the first member in the insertion engaging frame is pushed and expanded in a direction away from the outer wall by the locking claw. Is done. And the latching claw of the engaging part penetrated by the penetration hole is latched by the opposing wall part of the penetration engagement frame. Therefore, in the insertion engagement frame, stress tends to concentrate on the wall portion facing the outer wall of the first member. In particular, since the opposing wall portion of the opposing wall portion of the insertion engagement frame is separated from the outer wall of the first member, the rigidity tends to be relatively low. Further, the center portion of the opposing wall portion flows from the outer wall of the first member at the time of resin molding, and is a molten resin material that is wound around from the connecting portion to the first member located on both sides in the width direction of the insertion engagement frame. In many cases, weld lines are welded together to generate a weld line, which may reduce the rigidity. And when stress concentrates on such an opposing wall part, there exists a possibility that a crack may be produced in an insertion engagement frame, and there existed a possibility that sufficient fixing force could not be exhibited.

JP-A-5-252634

  The present invention has been made in the background of the above-mentioned circumstances, and its solution is to reduce the risk of damage to the lock mechanism and to provide a new structure that can exhibit a more stable fixing force. It is another object of the present invention to provide an assembly part having a locking mechanism.

  A first aspect of the present invention is a lock mechanism including an insertion engagement frame that protrudes from an outer wall of a first member and forms an insertion hole between the outer wall and an engagement portion provided in the second member. A locking mechanism in which the first member and the second member are fixed to each other by the engagement portion being inserted into the insertion hole and being engaged with the insertion engagement frame. In the assembly part comprising: a pair of locking protrusions protruding from the second member and facing each other with a gap between the engagement members; and protruding tip portions of the locking protrusions Are formed with locking claws protruding outward in the opposing direction of the pair of locking protrusions, and the pair of locking protrusions are inserted into the insertion holes, The locking claw is locked to a connecting portion to the outer wall of the first member in the insertion engagement frame. .

  According to the assembly part provided with the lock mechanism having the structure according to the present invention, the locking claw of the locking projection piece is locked at the connecting portion of the insertion engagement frame to the outer wall of the first member. As a result, the engaging claw is locked to the connecting portion that can ensure relatively high rigidity by being connected to the outer wall of the first member in the insertion engaging frame, and a stable locking force is obtained while obtaining a stable locking force. In addition, it is possible to avoid the concentration of stress on the opposing wall portion by avoiding the engagement between the opposing wall portion and the engaging portion with the outer wall in the insertion engagement frame that is likely to have low rigidity. As a result, the risk of damage such as a crack in the insertion engagement frame can be reduced, and a stable fixing force can be exhibited.

  In addition, this invention covers the opening part of this main body on the main body as a 1st member which has an opening part and penetrates a wire harness like the harness protector which penetrates and protects the wire harness of a motor vehicle, for example Electrical components are connected, such as those with a fixed cover as a second member, or electrical junction boxes such as junction boxes and relay boxes that are mounted on automobiles and connected to electrical components such as fuses, relays, and connectors. The upper body or the lower cover as the second member covering the box body is fixed to the box body as the first member to be used, and is not limited to other automobiles, but widely used in various assembly parts used in each field. Applicable.

  According to a second aspect of the present invention, in the one described in the first aspect, the pair of engagements that are inserted into the insertion hole and engaged with the insertion engagement frame are formed on the outer wall of the first member. Disengagement prevention protrusions interposed between the stop protrusion pieces are provided.

  In this aspect, the disengagement prevention protrusion is interposed between the pair of locking protrusions inserted through the insertion hole. Thereby, for example, when another member collides with the locking protrusion, it is possible to prevent the pair of locking protrusions from being inadvertently closed (approaching each other). As a result, the engagement state between the locking claw protruding from the locking protrusion and the insertion engagement frame can be stably maintained, and a more stable fixing force can be obtained.

  According to a third aspect of the present invention, in the one described in the first or second aspect, the pair of locking protrusions are connected to each other at a protruding base end portion from the second member. The opposing distance between the pair of locking protrusions is gradually increased from the protruding proximal end portion to the protruding distal end portion from the second member.

  In this aspect, the pair of locking protrusions are connected to each other at the protruding base end portion from the second member. Thereby, the intensity | strength of the latching protrusion in a protrusion base end part is securable. Further, the pair of locking protrusions are gradually separated as they protrude from the second member. Thereby, since it is made into the shape which is gradually opened to the protrusion front end side and is hard to close (it is hard to mutually approach), the engagement state with the penetration engagement frame can also be maintained more stably.

  In the present invention, the locking claws of the pair of locking protrusions protruding from the second member are locked to the connecting portion of the insertion engagement frame protruding from the first member to the outer wall of the first member. I made it. Thereby, while using a connection part with comparatively high rigidity in an insertion engagement frame, while exhibiting high locking force, the wall which opposes the outer wall of the 1st member in the insertion engagement frame in which rigidity is easy to become relatively low Stress concentration on the part can be avoided. As a result, a stable fixing force can be exhibited while reducing the possibility of damage to the insertion engagement frame.

The disassembled perspective view of the harness protector as one Embodiment of this invention. The principal part side view of the main body of the harness protector shown in FIG. The top view of the principal part shown in FIG. The principal part side view of the cover of the harness protector shown in FIG. The side view of a locking mechanism.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, FIG. 1 shows a harness protector 10 as an assembly part including a lock mechanism as one embodiment of the present invention. The harness protector 10 is configured such that a cover 14 as a second member is fixed to a main body 12 as a first member by a lock mechanism 16 provided at a plurality of locations. Is housed in the inserted state, and the cover 14 is assembled to the main body 12 to accommodate and protect the wire harness in the main body 12 and the cover 14. The lock mechanisms 16 are provided at a plurality of positions in the longitudinal direction of the harness protector 10 on both sides in the width direction orthogonal to the longitudinal direction of the harness protector 10.

  The main body 12 is formed from a synthetic resin. The main body 12 has a substantially U-shaped cross section in which a pair of side walls 20, 20 as outer walls are vertically erected along the bottom wall 18 from both edges in the width direction of the bottom wall 18 having a long rectangular plate shape. It is extended with. Accordingly, the main body 12 has both ends in the longitudinal direction open, and has an opening 22 opened in the protruding direction from the bottom wall 18 of the side walls 20, 20.

  As shown in FIGS. 2 and 3, an insertion engagement frame 24 is integrally formed on the side wall 20. The insertion engagement frame 24 projects from the side wall 20 to the outside of the main body 12 (downward in FIG. 3), and has a rectangular frame shape having a substantially U shape in plan view (see FIG. 3). The insertion engagement frame 24 is connected to the side wall 20 and a pair of connection portions 26 and 26 protruding outward from the side wall 20 are separated by a predetermined distance L in the longitudinal direction of the main body 12 (left and right direction in FIG. 3). At the same time, projecting tip edges from the side walls 20 of the connecting portions 26, 26 are connected by opposing wall portions 28 extending in parallel with the side walls 20. Thus, the opposing wall portion 28 is supported by the connecting portions 26 and 26 and is opposed to the side wall 20 with a predetermined distance: W from the side wall 20 in the width direction of the main body 12 (vertical direction in FIG. 3). . As a result, there is an insertion hole between the side wall 20 and the insertion engagement frame 24 that has a rectangular cross-sectional shape of length: L × width: W and opens on both sides in the overlapping direction of the cover 14 (vertical direction in FIG. 3). 30 is formed.

  Further, on the side wall 20, a detachment prevention protrusion 32 is integrally formed below the insertion engagement frame 24 (downward in FIG. 2). The detachment prevention protrusion 32 is positioned below the insertion engagement frame 24 by a predetermined distance in the overlapping direction of the cover 14 (vertical direction in FIG. 2). The detachment prevention protrusion 32 protrudes from the side wall 20 with a substantially constant cross-sectional shape. The cross-sectional shape of the detachment prevention protrusion 32 is not particularly limited, and a circular shape, a rectangular shape, other polygonal shapes, or an arbitrary shape can be adopted. In this embodiment, a locking protrusion piece 40a described later is used. , 40b and is fitted in a substantially isosceles trapezoidal shape, and an inclination angle with respect to the overlapping direction of the covers 14 (vertical direction in FIG. 2) of both side surfaces 33, 33 corresponding to both oblique sides of the isosceles trapezoid: α Is substantially equal to an inclination angle β of opposing edge portions 46a and 46b of locking protrusions 40a and 40b of the cover 14 described later. In addition, the protrusion dimension from the side wall 20 of the detachment prevention protrusion 32 has an appropriate protrusion dimension, so that it can be stably engaged with an engagement portion 38 of the cover 14 to be described later, while suppressing excessive protrusion, so that other members In order to avoid interference with the insertion hole 30, the width dimension of the insertion hole 30 is preferably set slightly smaller than W.

  On the other hand, as shown in FIG. 1, the cover 14 is made of synthetic resin. The cover 14 has a substantially U-shaped cross section in which a pair of peripheral walls 36 and 36 are vertically erected along the top plate 34 from both edges in the width direction of the top plate 34 having a rectangular plate shape. The length is approximately equal to twelve.

  As shown in FIG. 4, in the cover 14, an engagement portion 38 is integrally formed at a position corresponding to the insertion engagement frame 24 of the main body 12. The engaging portion 38 is formed with a pair of locking projections 40a and 40b. These locking protrusions 40 a and 40 b are formed in a protruding piece shape protruding from the peripheral wall 36 of the cover 14 toward the main body 12. The locking protrusions 40 a and 40 b in the present embodiment are formed as a single plate connected to each other at the protruding base end portion 42 from the peripheral wall 36. Then, by branching and extending from the projecting base end portion 42, the projecting distal end portions 44a and 44b are opposed to each other with a gap therebetween. Note that the protruding tip portions 44a and 44b are such that the opposing edge portions 46a and 46b are inclined at a fixed inclination angle β with respect to the protruding direction of the locking protrusions 40a and 40b (downward in FIG. 4). As the protrusion tip side (lower side in FIG. 4) goes, the opposing distance D is gradually increased, while the outer edges 48a and 48b opposite the opposing edges 46a and 46b are: The locking protrusions 40a and 40b extend straight in the protruding direction. The inclination angle β at the opposing edges 46 a and 46 b of the projecting tip portions 44 a and 44 b is substantially equal to the inclination angle α of the side surfaces 33 and 33 of the detachment prevention protrusion 32 in the main body 12.

  Further, the projecting leading end portions 44a and 44b of the both locking protrusions 40a and 40b are provided on the outer sides in the opposing direction (left and right direction in FIG. 4) of the locking protrusions 40a and 40b from the outer edge portions 48a and 48b. The protruding latching claws 50 are integrally formed. The locking claw 50 is positioned at a right angle portion on the protruding base end 42 side of the outer edge portions 48a and 48b, and tapers in the protruding direction (downward in FIG. 4) of the locking protrusions 40a and 40b. It is a substantially right triangle.

  The engaging portion 38 is formed with a constant thickness dimension equal to the peripheral wall 36 of the cover 14 over the entire length from the protruding base end portion 42 to the protruding tip end portions 44a, 44b of the locking protruding pieces 40a, 40b. The thickness dimension of the engaging portion 38 is smaller than the width dimension W of the insertion hole 30 in the main body 12. In addition, the engaging portion 38 has a width dimension Wf of a protruding leading edge portion (lower edge portion in FIG. 4) from the peripheral wall 36 smaller than a length dimension L of the insertion hole 30. The maximum width dimension: Wr at the formation site of the pawls 50, 50 is larger than the length dimension: L of the insertion hole 30.

  Further, notches 52 and 52 are formed on both sides of the protruding base end portion 42 of the engaging portion 38 in the cover 14. The notches 52 and 52 are formed by cutting from the peripheral wall 36 to the top plate 34. Since the engaging portion 38 is separated from the peripheral wall 36 by the notches 52 and 52, even when the engaging portion 38 is bent and deformed when assembled to the main body 12, the deformation of the engaging portion 38 is applied to the peripheral wall 36. It is not transmitted.

  Such a cover 14 is superimposed on the opening 22 of the main body 12. Note that the peripheral walls 36 and 36 of the cover 14 are overlapped on the outside of the side walls 20 and 20 of the main body 12. FIG. 5 shows an assembled state of the cover 14 to the main body 12. When the cover 14 is overlaid on the main body 12, the locking protrusions 40 a and 40 b of the engagement portion 38 protrude into the insertion hole 30 formed between the side wall 20 of the main body 12 and the insertion engagement frame 24. , 44b. When the projecting tip portions 44 a and 44 b are inserted into the insertion holes 30, the locking claws 50 and 50 come into contact with the connecting portions 26 and 26 of the insertion engagement frame 24, so that the locking projection pieces 40 a and 40 b are moved. , Elastically deformed in directions approaching each other. Furthermore, when the locking claws 50, 50 get over the connecting portions 26, 26, the locking protrusions 40a, 40b are separated from each other by a restoring force and return to the original shape. As a result, as shown in FIG. 5, the locking protrusions 40 a and 40 b are inserted into the insertion engagement frame 24, and the locking claws 50 and 50 are below the connecting portions 26 and 26 of the insertion engagement frame 24. (In FIG. 5, below) and opposed to the connecting portions 26 and 26. As a result, when the cover 14 is about to be detached from the main body 12 (when it is moved upward in the figure), the locking claws 50 and 50 are locked by the connecting portions 26 and 26, so that the cover 14 14 is fixed to the main body 12. Thus, in the present embodiment, the lock mechanism 16 is configured including the engagement portion 38 and the insertion engagement frame 24.

  In the harness protector 10 configured according to the present embodiment, the locking protrusions 40a and 40b of the cover 14 are engaged with the connecting portions 26 and 26 of the insertion engagement frame 24 of the main body 12 by the locking claws 50 and 50. It has come to be stopped. Thus, the locking protrusions 40a and 40b are connected to the side wall 20 and locked by the relatively strong connecting portions 26 and 26 in the insertion engagement frame 24 to obtain a strong locking force. It is possible to reduce the stress on the opposing wall portion 28 that tends to have a relatively low strength due to being supported by being spaced apart from the side wall 20 by 26, 26, or due to the occurrence of a weld line. As a result, it is possible to reduce the risk of deformation or damage of the insertion engagement frame 24 and perform more stable fixing. Further, since the insertion engagement frame 24 is continuous from one connection portion 26 to the other connection portion 26 through the opposing wall portion 28 without having a cutting portion, the insertion engagement frame 24 is provided. The possibility that an electric wire or the like is caught on 24 is also avoided. Furthermore, the locking protrusions 40a and 40b are formed from the protruding tip end portions 44a and 44b to the protruding base end portion 42 with a constant thickness dimension smaller than the width dimension W of the insertion hole 30 (see FIG. 3). Therefore, when the locking protrusions 40 a and 40 b are inserted into the insertion hole 30, the opposing wall portion 28 can be inserted without being spread outwardly away from the side wall 20. As a result, the risk of deformation of the opposing wall portion 28 can be further reduced.

  The pair of locking protrusions 40 a and 40 b are connected to each other at the protruding base end portion 42. Thereby, the intensity | strength of latching protrusion 40a, 40b can be improved. Further, since the locking protrusions 40a and 40b are formed in an expanded shape that is gradually separated toward the front end in the protruding direction, the locking protrusions 40a and 40b can be locked even when other members collide in the insertion state of the insertion engagement frame 24. The protrusions 40a and 40b are made difficult to approach each other, and the engaged state with the connecting portions 26 and 26 can be maintained more stably. Furthermore, the lock mechanism 16 in the present embodiment is configured to include the disengagement prevention protrusion 32. When the engagement protrusions 40a and 40b are inserted into the insertion engagement frame 24, the engagement protrusions 40a and 40b. The anti-protrusion protrusion 32 is interposed between the opposing edge portions 46a and 46b. As a result, even when the engaging protrusions 40a and 40b are deformed in a direction approaching each other due to collision of other members, the engaging protrusions 40a and 40b come into contact with the disengagement prevention protrusion 32. The deformation of the engaging protrusions 40a and 40b in the direction approaching each other is more effectively prevented, and the engagement state between the locking claws 50 and 50 and the connecting portions 26 and 26 is more stably ensured. It has become so.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the pair of locking protrusions need not be connected to each other at the protruding base end from the second member, and may be protruded independently from the second member. Furthermore, the gap dimension of the pair of locking protrusions may be constant from the protruding base end portion to the protruding distal end portion.

  Further, the insertion engagement frame is not limited to a rectangular shape in a plan view (see FIG. 3), and may be, for example, one having an arc shape in the plan view. Furthermore, the detachment prevention protrusion is not always necessary.

  Further, the present invention is not limited to the harness protector, and can be widely applied to assembly parts in various fields in which the first member and the second member are fixed to each other via a lock mechanism. For example, in an electrical junction box such as a junction box or a relay box mounted on an automobile, the present invention has a box body to which a connector or a relay is connected as a first member, and an upper case or a lower case that covers the box body as a second member. It is also possible to apply.

10: Harness protector (an assembly part having a lock mechanism), 12: Main body (first member), 14: Cover (second member), 16: Lock mechanism, 20: Side wall (outer wall), 24: Insertion engagement frame , 26: connecting portion, 28: opposing wall portion, 30: insertion hole, 32: disengagement prevention projection, 38: engagement portion, 40a, b: locking projection piece, 42: protruding base end portion, 44a, b: protruding Tip portion, 46a, b: opposite edge portion, 48a, b: outer edge portion, 50: locking claw

Claims (3)

A locking mechanism including an insertion engagement frame that protrudes from the outer wall of the first member and forms an insertion hole between the outer wall and an engagement portion provided in the second member; In an assembly component including a lock mechanism that is inserted into an insertion hole and engaged with the insertion engagement frame so that the first member and the second member are fixed to each other.
A pair of locking protrusions protruding from the second member are formed on the engaging portion so as to face each other with a gap therebetween. A locking claw that protrudes outward in the opposing direction of the protruding piece is formed,
The pair of locking protrusions are inserted into the insertion holes, and the locking claws of the locking protrusions are locked to a connection portion of the insertion engagement frame to the outer wall of the first member. The assembly part provided with the locking mechanism characterized by the above-mentioned. The outer wall of the first member is provided with an anti-disengagement protrusion interposed between the pair of locking protrusions inserted into the insertion hole and engaged with the insertion engagement frame. An assembly part provided with the described locking mechanism. The pair of locking protrusions are connected to each other at the protruding base end portion from the second member, and the opposing distance of the pair of locking protruding pieces is the protruding base end portion from the second member. The assembly part provided with the lock mechanism according to claim 1 or 2, which is gradually enlarged from the protruding tip to the protruding tip.

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