Electric connection box

Abstract

To provide an electric connection box capable of appropriately smoothing an attachment of a holder.SOLUTION: An electric connection box 1 comprises: a housing 2 that has an electric insertion part 25 that inserts an electric wire 51 while having a cylinder shape; and a holder 3 that is attached so as to cover an outer periphery of the electric insertion part 25, and holds a packing 8 provided to an outer periphery of the electric wire 51. The electric insertion part 25 includes: an engagement part 251 that is provided to an outer peripheral surface 25A; and a guide part 252 that is extended along an insertion direction of the electric wire 51 so as to be projected to the outer peripheral surface 25A. The holder 3 is constructed by forming an engaged part 311 that engages the holder 3 to the electric insertion part 25 so as to be engaged to the engagement part 251, and a slit 312 that is provided along an insertion direction, and inserts the guide part 252.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an electrical junction box. [Background technology]

[0002] 2. Description of the Related Art Conventionally, as described in Patent Document 1, for example, an electrical junction box is known which includes a case for accommodating electronic components, a lead-out portion formed in the case, and electric wires are led out from the lead-out portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-230329 A Summary of the Invention [Problem to be solved by the invention]

[0004] In such an electrical connection box, a packing may be provided in the lead-out portion and a holder for holding the packing may be attached to the lead-out portion in order to seal off water between the lead-out portion and the electric wire. In this case, it is conceivable that the lead-out portion is shaped like a cylinder and the holder is attached to the outer periphery of the tip of the lead-out portion. The holder is engaged with the lead-out portion by providing a locking protrusion on the outer periphery of the lead-out portion and a locked portion on the holder that engages with the locking protrusion.

[0005] However, there is room for improvement in that it is not easy to attach the holder to the lead-out part. For example, when the lead-out part and the holder are cylindrical, the holder rotates with respect to the lead-out part, making it difficult to engage the locked part of the holder with the locking protrusion of the lead-out part.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide an electrical junction box that allows a holder to be attached appropriately and smoothly. [Means for solving the problem]

[0007] In other words, the electrical connection box of the present invention comprises a housing having a cylindrical electric wire insertion portion through which an electric wire is inserted, and a holder attached to cover the outer periphery of the electric wire insertion portion and holding a gasket provided on the outer periphery of the electric wire, the electric wire insertion portion having a locking portion provided on its outer periphery and a guide portion protruding from the outer periphery and extending along the insertion direction of the electric wire, and the holder is configured to form an engaged portion that engages with the locking portion to lock the holder to the electric wire insertion portion, and a slit provided along the insertion direction through which the guide portion can be inserted. Effect of the Invention

[0008] According to the electrical junction box of the present invention, the holder can be attached appropriately and smoothly. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing an electrical junction box according to an embodiment. [Diagram 2] FIG. 2 is an exploded perspective view showing the electrical junction box according to the embodiment. [Diagram 3] FIG. 3 is an explanatory diagram of a holder and an electric wire insertion portion of the electric junction box according to the embodiment. [Figure 4] 4 is a cross-sectional view of the holder and the electric wire insertion portion taken along line IV-IV in FIG. [Diagram 5] FIG. 5 is an explanatory diagram of the attachment of the holder in the electrical junction box according to the embodiment. [Figure 6] FIG. 6 is an explanatory diagram of the attachment of the holder in the electrical junction box according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to this embodiment. In addition, the components in the following embodiments include those that are replaceable and easy for a person skilled in the art, or those that are substantially the same.

[0011] [Embodiment] This embodiment relates to an electric junction box. In the following description, among the first, second, and third directions that intersect with each other, the first direction is referred to as the "mounting direction X", the second direction is referred to as the "width direction Y", and the third direction is referred to as the "height direction Z". Here, the mounting direction X, the width direction Y, and the height direction Z are mutually perpendicular. The mounting direction X corresponds to the mounting direction of the holder and the insertion direction of the electric wire. The width direction Y and the height direction Z correspond to intersecting directions that intersect with the mounting direction X. In addition, each direction used in the following description represents a direction in a state in which each part is assembled with each other, unless otherwise specified. Note that the orthogonal here includes substantially orthogonal.

[0012] 1 and 2, the electrical junction box 1 is a box for connecting a plurality of electric wires, and is mounted on, for example, a vehicle and used as a fuse box. The electrical junction box 1 includes a housing 2 and a holder 3. The housing 2 is a box for accommodating electric components, and accommodates, for example, a fuse 6. The fuse 6 is accommodated, for example, in a diagonal direction in the housing 2 formed in a substantially rectangular parallelepiped shape, and is fastened and fixed in the housing 2 by a bolt 61.

[0013] The housing 2 has a main body 21 and a lid 22. The main body 21 is a box with an open top. For example, the main body 21 has an open end in the height direction Z, and the opening has a rectangular or nearly rectangular shape. The lid 22 is detachable from the opening 2A of the main body 21, and is attached to the opening 2A to close the opening 2A. The lid 22 is fixed to the main body 21 by a fastening member 23.

[0014] The main body 21 forms a flange 24 that protrudes outward from a side wall 211. The side wall 211 is a portion that constitutes a side surface of the box-shaped main body 21. The flange 24 is a portion for mounting the electric junction box 1 to a vehicle, and has a hole 241 that penetrates the flange 24 in the height direction Z. For example, the electric junction box 1 is mounted to the vehicle by inserting a mounting member such as a stud bolt into the hole 241. In this embodiment, three flanges 24 are provided on the main body 21.

[0015] The main body 21 contains a seal member 7. The seal member 7 is a water-stopping member that stops water flow between the main body 21 and the lid 22, and is formed of an annular elastic member. The seal member 7 is disposed inside the side wall 211 of the main body 21. For example, the seal member 7 is attached to the main body 21 together with the lid 22 in a state where it is hooked onto the lid 22.

[0016] The housing 2 is formed with an electric wire insertion portion 25. The electric wire insertion portion 25 is an electric wire lead-out portion for drawing out the electric wire 51 of the electric wire with terminal 5 accommodated in the housing 2 to the outside of the housing 2. The electric wire insertion portion 25 also functions as an insertion path for the electric wire with terminal 5 when the electric wire with terminal 5 is assembled to the housing 2. The electric wire insertion portion 25 is provided according to the number of electric wires with terminal 5 to be installed, for example, two electric wires with terminal 5 are provided. The electric wire insertion portion 25 is provided protruding from the side wall portion 211 of the main body portion 21 and extends along the extending direction of the electric wire 51. The two electric wire insertion portions 25 are provided protruding in opposite directions from the opposing side wall portions 211. The electric wire insertion portion 25 is cylindrical and formed penetrating the side wall portion 211. That is, the electric wire insertion portion 25 communicates between the internal space 2B of the housing 2 and the outside.

[0017] The electric wire with terminal 5 is configured by attaching a terminal 52 to an end of an electric wire 51. For example, a crimp terminal that is crimped and attached to the electric wire 51 is used as the terminal 52. The terminal 52 may also be attached to the electric wire 51 and function as a bus bar. For example, the terminal 52 has a hole 521 formed therein, and a bolt 61 is inserted into the hole 521 and fastened together with the fuse 6 to be fixed in the housing 2. For example, a coated electric wire in which a core wire, which is a conductor, is coated with an insulating member is used as the electric wire 51. The electric wire with terminal 5 functions as, for example, a part of a wire harness. Note that in Figs. 1 and 2, the extending portion of the electric wire 51 of the electric wire with terminal 5 is omitted.

[0018] A packing 8 is attached to the outer periphery of the electric wire 51. The packing 8 is a water-stopping member that stops water from entering between the electric wire insertion portion 25 and the electric wire 51, and is made of, for example, a ring-shaped elastic member. The packing 8 is used by being disposed inside the electric wire insertion portion 25, and is installed by being inserted into the electric wire insertion portion 25 in a state where it is attached to the outer periphery of the electric wire 51, for example.

[0019] As shown in FIG. 3, the electric wire insertion portion 25 has a locking portion 251 and a guide portion 252. The locking portion 251 is a portion that locks the holder 3 to the electric wire insertion portion 25, and is provided, for example, as a locking protrusion that protrudes from the outer circumferential surface 25A of the electric wire insertion portion 25. The guide portion 252 is a guide member that guides the holder 3 attached to the electric wire insertion portion 25. The guide portion 252 protrudes from the outer circumferential surface 25A of the electric wire insertion portion 25 and extends along the insertion direction of the electric wire 51. The guide portion 252 is provided at a distance from the locking portion 251 in the circumferential direction of the electric wire insertion portion 25, and for example, two guide portions 252 are formed. That is, the guide portions 252 are provided at positions on both sides of the locking portion 251 with the locking portion 251 in between.

[0020] The guide portion 252 also functions as a reinforcing member for the electric wire insertion portion 25. For example, the guide portion 252 is connected to the side wall portion 211 of the main body portion 21, and functions as a reinforcing rib that supports the electric wire insertion portion 25. The guide portion 252 is provided, for example, from the base end position of the side wall portion 211 to the tip end position of the tip of the electric wire insertion portion 25, and is formed so that the protruding length L from the outer circumferential surface 25A becomes shorter from the base end position toward the tip end position. Specifically, the guide portion 252 forms a straight region 252A in which the protruding length L gradually becomes shorter from the base end position, and the protruding length L does not change at the position covered by the holder 3. Here, "does not change" includes one that does not change almost at all. For example, the straight region 252A is formed up to the tip position of the guide portion 252. For this reason, the tip of the guide portion 252 has the same or almost the same protruding length L as the straight region 252A, and is steeply lowered to form a step shape.

[0021] 4, for example, the straight region 252A and the protruding length L at the tip of the guide portion 252 are longer than the thickness T of the holder 3. Also, the guide portion 252 is provided such that the upper end protrudes from the outer circumferential surface 3A of the holder 3 when inserted into the slit 312. Furthermore, the tip of the guide portion 252 is formed in a stepped shape. This prevents the holder 3 from riding up onto the guide portion 252 and being inappropriately attached to the electric wire insertion portion 25.

[0022] 3, a first reinforcing rib 253 is provided between the two guide parts 252. The first reinforcing rib 253 is a reinforcing member that supports the electric wire insertion part 25, and is provided alongside the guide part 252. Like the guide part 252, the first reinforcing rib 253 protrudes from the outer circumferential surface 25A of the electric wire insertion part 25 and extends along the insertion direction of the electric wire 51. The first reinforcing rib 253 is provided from the base end position of the side wall part 211 to the tip position in the vicinity of the locking part 251, and is formed so that the protruding length from the outer circumferential surface 25A becomes shorter from the base end position toward the tip position. Like the guide part 252, the first reinforcing rib 253 forms a straight region 253A whose protruding length does not change.

[0023] The electric wire insertion portion 25 is provided with a second reinforcing rib 254. The second reinforcing rib 254 is a reinforcing member that supports the electric wire insertion portion 25, and similar to the guide portion 252, is provided on the outer peripheral surface 25A of the electric wire insertion portion 25 and extends along the insertion direction of the electric wire 51. The second reinforcing rib 254 is formed at a position spaced apart from the guide portion 252 in the circumferential direction of the electric wire insertion portion 25, and is formed shorter than the guide portion 252 in the insertion direction (attachment direction X). For example, assuming that the guide portion 252 is provided at the upper portion of the electric wire insertion portion 25, the second reinforcing rib 254 is provided on the side of the electric wire insertion portion 25. The second reinforcing rib 254 also functions as a second guide member that guides the holder 3 attached to the electric wire insertion portion 25. As shown in FIG. 4, the guide portion 252, the first reinforcing rib 253, the second reinforcing rib 254 and the locking portion 251 may be provided on the opposite side across the electric wire 51.

[0024] In FIG. 3 , the holder 3 is a member that holds the packing 8 that is installed in the electric wire insertion portion 25, and is attached to the tip end of the electric wire insertion portion 25 so as to cover the outer periphery. The holder 3 has a tubular portion 31 and an end surface portion 32. The tubular portion 31 is cylindrical and is arranged to cover the outer periphery of the electric wire insertion portion 25. The end surface portion 32 is a plate-like portion that closes one end of the tubular portion 31, and has a hole 321 in the center for inserting the electric wire 51 therethrough. The end of the tubular portion 31 opposite to the end surface portion 32 is opened to form an open end portion 33. The holder 3 is attached to the electric wire insertion portion 25 with the open end portion 33 facing the electric wire insertion portion 25.

[0025] The holder 3 has a locking portion 311, a slit 312, and a slit 313 formed in the tubular portion 31. The locking portion 311 is a portion that engages with the locking portion 251 of the electric wire insertion portion 25, and is provided, for example, as an arm member formed on the circumferential surface portion of the tubular portion 31. That is, the locking portion 311 is provided between two slits 312 formed in the tubular portion 31 from the open end portion 33 toward the end surface portion 32. The locking portion 311 is elastically deformed and rotatable in the radial direction of the holder 3 around the end surface portion 32. The locking portion 311 has an opening 311A ​​that penetrates in the radial direction, and the locking portion 251 is inserted into this opening 311A ​​to engage with the locking portion 251. The locking portion 251 and the locking portion 311 function as a locking mechanism between the electric wire insertion portion 25 and the holder 3.

[0026] The slit 312 is a groove into which the guide portion 252 is inserted, and is formed at a position corresponding to the guide portion 252 in the radial direction of the holder 3. The slit 312 extends, for example, along the insertion direction of the electric wire 51, and is formed so as to communicate with the inner surface and the outer surface of the tube portion 31. The groove width of the slit 312 is formed to be larger than the lateral width of the guide portion 252. The groove width of the slit 312 is the radial width of the holder 3, and the lateral width of the guide portion 252 is the radial width of the electric wire insertion portion 25.

[0027] The slit 313 is a groove into which the second reinforcing rib 254 is inserted, and functions as a second slit. The slit 313 is formed at a position corresponding to the second reinforcing rib 254 in the radial direction of the holder 3. The slit 313 extends, for example, along the insertion direction of the electric wire 51, and is formed so as to communicate the inner surface and the outer surface of the tube portion 31. The groove width of the slit 313 is formed to be larger than the lateral width of the second reinforcing rib 254. The groove width of the slit 313 relative to the lateral width of the second reinforcing rib 254 is formed to be smaller than the groove width of the slit 312 relative to the lateral width of the guide portion 252. In other words, the clearance of the groove width of the slit 313 relative to the lateral width of the second reinforcing rib 254 is smaller than the clearance of the groove width of the slit 312 relative to the lateral width of the guide portion 252. As a result, the electric junction box 1 can support the holder 3 by suppressing the rotation of the holder 3 relative to the electric wire insertion portion 25 by the second reinforcing rib 254 and the slit 313. As shown in FIG. 4, the locked portion 311, the slit 312 and the slit 313 may be provided on the opposite side across the electric wire 51.

[0028] A tapered surface 331 is formed on the open end 33 of the holder 3. The tapered surface 331 is a surface obtained by inclining the end face on the open end 33 side of the tube portion 31. The tapered surfaces 331 are formed on both end faces sandwiching the locked portion 311 and the slit 312, and are inclined so as to approach the opposite end face as they approach the slit 312. Therefore, the tapered surfaces 331 can guide the slit 312 to the position of the guide portion 252 when the holder 3 is attached.

[0029] Next, the attachment of the holder 3 in the electrical junction box 1 according to this embodiment will be described.

[0030] The holder 3 is attached to the electric connection box 1 by assembling the holder 3 to the tip portion of the electric wire insertion portion 25. First, as shown in FIG. 3, the holder 3 is placed facing the electric wire insertion portion 25. At this time, the electric wire 51 may be inserted into the holder 3 in advance. The holder 3 is placed with the open end 33 facing the electric wire insertion portion 25. Then, the locked portion 311 of the holder 3 is aligned with the position of the locking portion 251 of the electric wire insertion portion 25, and the holder 3 is moved toward the electric wire insertion portion 25.

[0031] 5, the slit 312 approaches the guide portion 252. At this time, since the tapered surface 331 is formed at the end of the tube portion 31, the slit 312 is guided to the position of the guide portion 252. This makes it easy for the electric junction box 1 to align the slit 312 with the position of the guide portion 252. In addition, the tip of the guide portion 252 has a stepped shape, and the protruding length L is greater than the thickness T of the holder 3. Therefore, the electric junction box 1 prevents the holder 3 from climbing up the guide portion 252 and being assembled to the electric wire insertion portion 25, and can prevent improper assembly of the holder 3.

[0032] 6, when the guide portion 252 is inserted into the slit 312, the holder 3 moves along the guide portion 252. Then, the locked portion 311 of the holder 3 engages with the locking portion 251. At this time, since the holder 3 moves along the guide portion 252, the electric connection box 1 can appropriately engage the locked portion 311 with the locking portion 251. The locked portion 311 passes over the locking portion 251 and inserts the locking portion 251 into the opening 311A ​​to complete the engagement. In addition, in parallel with the engagement of the locking portion 251 and the locked portion 311, the second reinforcing rib 254 is inserted into the slit 313. As a result, the holder 3 moves along the second reinforcing rib 254 in addition to the guide portion 252. Therefore, the holder 3 can be assembled to the electric wire insertion portion 25 at a more accurate position.

[0033] 1, when holder 3 is attached to electric wire insertion portion 25, locked portion 311 is locked to locking portion 251, and holder 3 is not easily removed from electric wire insertion portion 25. In this state, guide portions 252 are located on both sides of locking portion 251 and locked portion 311. Therefore, guide portions 252 function as protective members that protect the locking mechanism between locking portion 251 and locked portion 311.

[0034] In addition, the first reinforcing rib 253 extends to the vicinity of the locking portion 251, and the first reinforcing rib 253 forms a straight region 253A with a stepped tip. This reduces the gap between the locked portion 311 and the tip of the first reinforcing rib 253, thereby preventing a foreign object from being caught between the locked portion 311 and the first reinforcing rib 253 and releasing the lock.

[0035] The holder 3 is prevented from rotating in the circumferential direction relative to the wire insertion portion 25 by the locked portion 311 being locked by the locking portion 251. In addition, the holder 3 is appropriately prevented from rotating in the circumferential direction because the second reinforcing rib 254 is inserted along the mounting direction X. For example, the clearance of the second reinforcing rib 254 with respect to the slit 313 is made smaller than the clearance of the guide portion 252 with respect to the slit 312, and the second reinforcing rib 254 can appropriately prevent the holder 3 from rotating in the circumferential direction. This reduces the burden of the guide portion 252 in preventing rotation, and prevents deformation of the locking portion 251 and the locked portion 311. This allows the locking portion 251 and the locked portion 311 to be stably maintained in a locked state.

[0036] As described above, the electrical connection box 1 of this embodiment is provided with the guide portion 252 in the electric wire insertion portion 25, so that the guide portion 252 can be inserted into the slit 312 of the holder 3 to properly and smoothly attach the holder 3 to the electric wire insertion portion 25.

[0037] Furthermore, in the electrical connection box 1 of this embodiment, by providing guide portions 252 on both sides of the locking portion 251, the locking portion 251 and the locked portion 311 can be protected by the guide portions 252, and the locked state of the locking portion 251 and the locked portion 311 can be maintained.

[0038] In addition, by forming a straight region 252A in the guide portion 252, the electrical connection box 1 of this embodiment can prevent improper assembly, such as the holder 3 climbing over the guide portion 252 when assembled to the electric wire insertion portion 25.

[0039] Furthermore, by providing the second reinforcing rib 254, the electrical connection box 1 of this embodiment can appropriately prevent the holder 3 from rotating in the circumferential direction when the holder 3 is assembled to the wire insertion portion 25.

[0040] The electrical connection box according to the present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the claims. The electrical connection box 1 according to this embodiment may be configured by appropriately combining the components of the above-described embodiment and modified examples.

[0041] For example, in the above embodiment, the electrical junction box 1 is mounted on a vehicle, but the electrical junction box according to the present invention may be used without being mounted on a vehicle. [Explanation of symbols]

[0042] 1: Electrical junction box 2: Housing 3: Holder 8: Packing 25: Wire insertion part 25A: Outer surface 51: Electric wire 251: Locking part 252: Guide section 252A: Straight area 254: Second reinforcing rib (reinforcing rib) 311:Locked part 312: Slit 313: Slit (second slit) L:Protrusion length

Claims

1. a housing having a cylindrical shape and an electric wire insertion portion through which an electric wire is inserted; a holder that is attached to cover an outer periphery of the electric wire insertion portion and that holds a packing that is provided on an outer periphery of the electric wire, the electric wire insertion portion has a locking portion provided on an outer circumferential surface and a guide portion protruding from the outer circumferential surface and extending along an insertion direction of the electric wire, The holder has a locked portion that engages with the locking portion to lock the holder to the electric wire insertion portion, and a slit that is provided along the insertion direction and into which the guide portion is inserted. Electrical junction box.

2. At least two guide portions are provided, and are formed on both sides of the locking portion.

2. The electrical junction box according to claim 1.

3. the guide portion forms a straight region in which a protruding length from the outer periphery does not change, and an upper end of the guide portion protrudes from an outer periphery surface of the holder in a state where the guide portion is inserted into the slit in the straight region.

3. The electrical junction box according to claim 1 or 2.

4. the electric wire insertion portion further includes a reinforcing rib that is formed at a position spaced apart from the guide portion in the circumferential direction, protrudes from the outer circumferential surface, and extends along the insertion direction of the electric wire, The holder further has a second slit formed along the insertion direction into which the reinforcing rib is inserted.

3. The electrical junction box according to claim 1 or 2.

Images