JP2007280697A - Mounting structure of watertight cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent later separation of a mounting structure of a watertight cover made by outwardly fitting the watertight cover from a protruded side tip of a terminal block toward its root. <P>SOLUTION: A plurality of island-like projection parts 15 are formed at an outer periphery face of the terminal block along its peripheral direction, with a groove-like recess part 13 formed at a place nearer to the root part than the island-like projection parts. A plurality of protruded parts 51 formed at the watertight cover 41 in free elastic deformation inward and outward along a periphery of the opening at a front side. The protruded parts 51 are provided with engagement hooks engaged with the groove-like recess part 13 and an engagement window 58 engaged with the island-like projection parts 15. It is so structured that the engagement hooks are engaged with the groove-like recess part 13 and the island-like projection parts 15 are engaged with the engagement window 58, with the inner periphery face of the opening at the front side of the watertight cover 41 in a state outwardly fitted to the outer periphery face of the terminal block 1. This double-locking structure enhances an effect of separation prevention. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, a cylindrical waterproof cover having an opening on the front side is externally fitted toward the root from the tip of a terminal block having one or more electrode terminals connected to the end of an electric wire through a waterproof material. This relates to a waterproof cover mounting structure.

  For example, with respect to the electrode terminal (terminal fitting) arranged at the protruding end (protruding front end surface) of the terminal block formed in a protruding shape on the outer wall of the case in which the circuit board is accommodated, There is a terminal connection portion (structure) in which the end portion is fixed by caulking or soldering, and post-separation is impossible. As a means for waterproofing such a terminal connection part, a method of molding and hardening it with resin so as to surround the terminal connection part, or a resin waterproof cover to cover the terminal connection part A means for attaching via a waterproof material such as rubber packing may be mentioned. Among these methods, the waterproof cover can be attached by covering the terminal block with a resin waterproof cover (hereinafter also referred to simply as a cover) that opens on the front side from the tip of the terminal block to the base. What you do is known.

In such a waterproof cover mounting structure, since it is necessary to prevent the waterproof cover from being detached after the waterproof cover is installed, it is usually provided with some type of retaining structure (hereinafter also referred to as a lock or lock structure). It is normal. As the locking structure, one or a plurality of island-shaped protrusions (engaging protrusions) are provided on the outer peripheral surface of the protruding terminal block, while the front opening (opening) side of the cover has a peripheral edge. One or a plurality of elastically deformable protrusions (elasticity) provided with engagement windows (engagement holes) arranged and formed so that the island-shaped protrusions engage when the cover is put on the terminal block The thing provided with the engaging part) is proposed, for example in a waterproof connector (patent document 1). In this case, when the waterproof cover is attached, the projecting portion is deformed by its own elasticity and restored to its original shape, so that the island-shaped convex portion is fitted into the engagement window, so that the cover is It is intended to prevent it from coming off.
JP 2001-93611 A

  However, in such a cover mounting structure, there is a merit that the mounting itself is simple because the lock can be done with one touch, but the cover can be removed even by a relatively small external force. There is. In other words, the conventional lock structure in the mounting structure often assumes that the lock is released as needed for repair after the mounting, and therefore it is relatively easy to separate. It was configured to be removable. In other words, it can be said that the conventional lock structure is not suitable for use in a site where no subsequent release of the lock is planned or where there is a request to reliably prevent the release. As described above, the conventional lock structure has a problem in that it cannot be used at a part where it is desired to permanently maintain a certain waterproof property because of its low reliability.

  The present invention has been made in view of these problems. Like the terminal connection portion described above, the waterproof cover is not planned to be separated later, or it is desired to reliably prevent the subsequent separation. It is an object of the present invention to provide a waterproof cover mounting structure suitable for use on a site.

In order to achieve the above object, according to the first aspect of the present invention, a cylindrical waterproof cover having an opening on the front side includes one or more electrode terminals connected to an end of an electric wire via a waterproof material. A waterproof cover mounting structure that is externally fitted from the tip of the terminal block to the base,
On the outer peripheral surface of the terminal block, one or a plurality of island-shaped convex portions are formed along the circumferential direction thereof, and in the outer peripheral surface, the portion closer to the tip or the root than the island-shaped convex portion is provided. While one or more recesses are formed,
The waterproof cover includes one or a plurality of protrusions that protrude forward and are elastically deformed inside and outside the waterproof cover itself, around the front opening thereof, When the waterproof cover is externally fitted to the terminal block, the waterproof cover rides on the outer peripheral surface of the terminal block, elastically deforms outward, and then engages with the engagement hook and the island-shaped protrusion. A mating engagement window,
The engaging hook in the protruding portion is engaged with the concave portion, and the island-shaped convex portion is engaged with the engaging window in the protruding portion.

  According to a second aspect of the present invention, the island-shaped convex part is formed closer to the tip of the terminal block than the concave part, while the engaging hook of the protruding part is connected to the waterproof cover. 2. The waterproof cover mounting structure according to claim 1, wherein the waterproof cover mounting structure is formed so as not to run over the island-shaped convex portions in the process of external fitting. 3.

  According to a third aspect of the present invention, the island-shaped convex portion is formed closer to the tip of the terminal block than the concave portion, and the engaging hook of the protruding portion is connected to the waterproof cover on the terminal block. 2. The waterproof cover mounting structure according to claim 1, wherein the waterproof cover mounting structure is formed so as to straddle the island-shaped convex portion in the process of external fitting.

  According to a fourth aspect of the present invention, the protruding portion is provided by being divided into a plurality of parts through a slit cut at a predetermined width from the front end side to the rear side, while the waterproof cover is fitted on the outside. The outer peripheral surface of the terminal block is provided with insertion convex portions formed so as to be closely fitted into the slits, and the respective insertion convex portions are fitted into the respective slits. The waterproof cover mounting structure according to any one of claims 1 to 3.

  In the first aspect of the present invention, as in the prior art, the engagement window provided on the protruding portion of the waterproof cover is engaged with the island-shaped convex portion provided on the outer peripheral surface of the mating terminal block that covers the waterproof cover. It ’s not just a match. That is, in addition to such engagement, the engagement hook provided on the protruding portion is also engaged with the recess provided on the outer peripheral surface of the terminal block. Thus, in the present invention, since it has a so-called double lock structure, it is possible to more effectively prevent the waterproof cover from being easily detached after the waterproof cover is once attached. Can increase the sex. In addition, in this invention, it can be said that the more the part to be engaged, the higher the effect of preventing the separation. In that case, the projecting portion is arranged so as to surround the outer peripheral surface of the projecting terminal block. In addition, an engagement hook and an engagement window are formed on the outer peripheral surface of the terminal block. On the outer peripheral surface of the terminal block, a concave portion and an island-shaped convex portion may be formed so as to correspond to them.

  And in this invention of Claim 2, in addition to an above described effect, there exist the following specific effects. That is, when the island-shaped convex portion is formed at a position closer to the tip than the concave portion on the outer peripheral surface of the terminal block, and the engagement hook of the protruding portion is formed so as to ride on the island-shaped convex portion. In addition, in addition to the outward deformation caused by riding on the outer peripheral surface of the terminal block, the engaging hook rides on the island-shaped convex portion, so that the larger deformation is forced. Therefore, in that case, it is necessary to allow a large elastic deformation to the protrusion. However, in order to allow large elastic deformation of the protruding portion in this way, it is necessary to lengthen the protruding portion or to form the material with a material that is easily elastically deformed. Become. That is, in order to make it difficult for the lock to be released, it is preferable that the protruding portion is difficult to elastically deform. Therefore, this is made of a material (material) that is difficult to elastically deform, and the protruding amount of the protruding portion is set small. It is preferable to do this. Therefore, in the case where the island-shaped convex portion is formed closer to the tip of the terminal block than the concave portion, the engagement hook is provided on the outer peripheral surface of the terminal block by adopting the structure according to claim 2. In the process of engaging the concave portion, it is not necessary to get over the island-like convex portion, so that the protruding portion can be set to be difficult to elastically deform.

  Also in the invention according to claim 3, since the engaging hook of the protruding portion does not run on the island-shaped convex portion, each of the effects described above can be obtained. In addition, in the present invention, the engagement hooks exist in such an arrangement that the island-shaped convex portions are sandwiched between the left and right sides, so that the right and left balance in engagement is maintained. Therefore, even when a tensile force is applied to the waterproof cover rearward, a stable proof strength against the disengagement of the engagement is exhibited.

  In the invention according to claim 4, since the protrusions for fitting provided on the outer peripheral surface of the terminal block are closely fitted in the slits between the protrusions, the protrusions are directed toward the slits. Since deformation or movement is restricted, the installation of the waterproof cover is stabilized accordingly. In other words, the waterproof cover may be subjected to external force including squeezing to the left and right, etc. in addition to a straight pulling force to the rear, but even in such a case, in the present invention, the waterproof cover is detached from the terminal block. Or the risk of separation can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. FIG. 1 is an exploded perspective view for explaining the present embodiment, in which 1 is a terminal block, and 41 is attached to the terminal block 1 via a waterproof member 31 made of a ring-shaped rubber packing. A waterproof cover (housing) to be fitted. In this example, as shown in FIGS. 1 to 3, 9, and 10, the terminal block 1 is a side wall (side surface) of a synthetic resin case 2 on which a specific circuit board (not shown) is mounted. 3 is formed in a protruding shape in an oblong shape when viewed from the front end surface side. However, the cross section at the portion closer to the protruding tip 10 is formed to be slightly smaller than the ellipse in the cross section at the base (side wall 3), and at the tip of the small diameter portion 11 formed to be slightly smaller. A plurality (6 in this example) of electrode terminals (terminal fittings) 21 are provided at a certain protruding end 10 and arranged at equal intervals on the side, and each electrode terminal 21 extends into the case 2 and has a circuit therein. It is connected to each terminal of the board. In this embodiment, the electrode terminal 21 is formed from a metal plate, and its tip portion is bent into a U shape and provided in a protruding shape.

  The tip end portion (U-shaped portion) of each electrode terminal 21 is inserted with the tip end of the core wire of the electric wire 23 and connected by caulking, and the connecting portion forms a terminal connection portion (see FIG. 10). ). By the way, in this embodiment, the front end side (the left end side in FIG. 1) (not shown) of the electric wire 23 is connected to an oxygen sensor or a NOx sensor attached to the exhaust system of the automobile engine. A circuit for detecting the concentration of the specific gas component based on the gas concentration information obtained from the detection element and outputting the detection result to an external circuit (for example, ECU) (not shown) that controls the air-fuel ratio is formed. Yes. That is, in this embodiment, the connection terminal portion between the wiring (electric wire 23) for taking out the output from the sensor and the electrode terminal 21 on the circuit board side is subject to waterproofing, the connection is by caulking, No separation is planned.

  In this embodiment, the terminal block 1 is a part that forms a boundary with the wall surface 3 of the case 2 in the outer peripheral surface 12a of the part 12 that is slightly thicker than the small-diameter part 11 (hereinafter also referred to as a large-diameter part) 12. In addition, a recess 13 (hereinafter also referred to as a groove recess) 13 having a V-shaped cross section is formed along the outer peripheral surface 12a (see FIGS. 1 to 3, 9, and 10). Of the outer peripheral surface 12 a, the portion closer to the protruding end 10 of the terminal block 1 than the groove-shaped recess 13, and on both upper and lower sides of the flat outer peripheral surface 12 a along the major axis direction of the ellipse, are viewed in plan view. A plurality of rectangular island-shaped convex portions 15 are formed in a raised shape on the flat outer peripheral surface 12a on each of the upper and lower sides at a regular interval along the circumferential direction (in this example, five on each side surface). (Refer to FIGS. 1 to 3, 9, and 10). Each of the island-shaped convex portions 15 is similarly formed with a predetermined width W1 and a predetermined height, and is inclined downward toward the protruding tip 10 (hereinafter also simply referred to as the tip 10) of the terminal block 1. And an inclined surface 15a and a flat top surface 15b. Further, in this embodiment, between the island-shaped convex portions 15, the projections for insertion having a rectangular shape in a plan view are projected so as to extend behind the island-shaped convex portions 15 (on the wall surface 3 side of the case 2) with a predetermined width W 2. A portion 18 is provided, and the top surface 18b is formed flat.

  On the other hand, the waterproof cover 41 is formed of a synthetic resin (for example, PBT or 6-6 nylon) mixed with glass fiber in the present embodiment, and the protruding side tip 10 of the terminal block 1 on the front side (right side in FIG. 1). An oval opening 42 is provided so as to be externally fitted to the small-diameter portion 11 of the shift portion via a ring-shaped waterproof material (rubber packing) 31 (see FIGS. 5 and 6). In addition, on the front side of the waterproof cover 41, there is a terminal block pinching cylinder portion 44 having a depth (depth) in which the small diameter portion 11 of the terminal block 1 can be swallowed with the opening 42 as the front. On the rear side of the terminal block swallowing cylinder portion 44, each terminal connection portion including the end portion of each electric wire 23 connected by caulking to the electrode terminal 21 protruding from the tip of the terminal block 1 is provided on the inside. A terminal connection portion accommodating portion 47 having a plurality of terminal connection portion accommodating circular holes 46 formed so as to be accommodated while retaining a gap is formed so as to integrally protrude rearward (FIG. 4 to FIG. 4). (See FIGS. 6 and 10). The waterproof material 31 has a length over the entire length of the small-diameter portion 11 of the terminal block 1, and the inner peripheral surface side and the outer peripheral surface side each have three annular shapes extending along the circumferential direction. The pleats 32 and 33 are provided, and the pleats 32 on the inner peripheral surface side are externally fitted to the small diameter portion 11 so as to press against the outer peripheral surface 11 a of the small diameter portion 11 of the terminal block 1. The pleat 33 on the outer peripheral surface side is pressed against the inner peripheral surface of the terminal block swallowing tube portion 44 so that watertightness is maintained. However, in this embodiment, a flange portion 35 protruding outward is formed at the end portion of the waterproof material 31 on the boundary wall surface 14 side of the small diameter portion 11 and the large diameter portion 12 of the terminal block 1. The flange portion 35 is set so as to be sandwiched between the boundary wall surface 14 and the front end of the terminal block pinching cylinder portion 44 (see FIGS. 9 and 10).

  On the front side of the terminal block swallowing cylinder portion 44, a width is formed along the periphery of the opening 42 so as to protrude forward in the shape of a rectangular plate and to be elastically deformed inside and outside the waterproof cover 41. A plurality of wide projecting portions 51 and a plurality of narrow projecting portions 52 are integrally formed (see FIGS. 4 and 5). And the engagement hooks 53 and 54 which protrude inward are provided in the inner front-end | tip of each protrusion part 51 and 52, respectively along a front-end | tip (circumferential direction). However, the engagement hooks 53 and 54 have a cross-sectional shape that closely engages with the groove-like recess 13. Moreover, the wide protrusion part 51 is provided along the major axis direction of the opening 42, and the narrow protrusion part 52 is provided along the minor axis direction. The engagement hooks 53 and 54 are mounted on the outer periphery 12a of the large-diameter portion 12 when the waterproof cover 41 is externally fitted to the terminal block 1 and elastically deformed outward, and then when the external fitting is finished. It is formed so as to engage with the groove-shaped recess 13 (see FIG. 11). In addition, when the waterproof cover 41 is externally fitted to the terminal block 1, the engagement hooks 53 and 54 are arranged so that the front end side of the hooks 53 and 54 has a boundary wall surface 14 between the small diameter portion 11 and the large diameter portion 12 and a large diameter portion. In order to ride on the outer peripheral surface 12a after colliding with the angle between the outer peripheral surface 12a and the outer peripheral surface 12a, it is inclined so that the amount of protrusion toward the front end side becomes small so as to form a guide for facilitating the riding (See FIG. 11). Further, as shown in FIG. 4, the projecting portions 51 and 52 are divided into a plurality of portions through a slit 55 cut at a predetermined width W5 from the front end side of the opening 42 toward the rear. However, among the slits 55, those provided between the protrusions 51 provided along the major axis direction of the opening are the projections for insertion described above when the waterproof cover 41 is externally fitted to the terminal block 1. The portion 18 is set so as to fit closely.

  Moreover, although the large number of protrusions 51 and 52 are formed so as to be fitted on the outer peripheral surface 12a of the large-diameter portion 12 of the terminal block 1, in the present embodiment, among these, the wide protrusions 51 are formed. The provided engagement hook 53 has a cutout portion 57 having a predetermined width W6 by cutting out an intermediate portion in the width direction (see FIGS. 5 and 6). In other words, the engagement hook 53 is formed in the form of island-shaped protrusions formed on the outer peripheral surface thereof as shown in FIG. 12 in the process in which the waterproof cover 41 is fitted on the outer peripheral surface 12a of the large-diameter portion 12 of the terminal block 1. When the protrusion 51 is viewed from the front so as to straddle the portion 15, as shown in FIG. 5 and FIG. 6, the intermediate portion in the width direction is notched and has a predetermined width W6. A portion 57 is provided. The notch 57 is arranged corresponding to the island-shaped convex portion 15, and its width W 6 is set larger than the width W 1 of the island-shaped convex portion 15. In other words, in this embodiment, the engagement hook 53 does not run on the island-shaped protrusion 15 in the process of covering the waterproof cover 41 from the protruding tip 10 of the terminal block 1 toward the base and fitting the waterproof cover 41 to the terminal block 1. Is set to

  In this embodiment, when the waterproof cover 41 is externally fitted to the terminal block 1, the inner surface of the protruding portion 51 is set so as to be in close contact with the outer peripheral surface 12 a of the large-diameter portion 12 of the terminal block 1. Further, the inward protruding amount of the engaging hook 53 is set to be substantially the same as the raised height of the island-shaped convex portion 15. Accordingly, when the waterproof cover 41 is externally fitted to the terminal block 1, when the engagement hook 53 rides on the outer peripheral surface 12a of the large-diameter portion 12 and elastically deforms outward, the engagement hook 53 is island-shaped convex. Even if it does not ride on the portion 15, since the protruding portion 51 bends and deforms in a cantilever state where the deformation amount on the base side is small, the groove bottom of the notch portion 57 on the inner surface of the protruding portion 51 is island-shaped convex. Slightly ride on part 15. However, in this embodiment, as described above, each island-shaped convex portion 15 has the inclined surface 15a that is inclined downward toward the protruding-side tip 10 of the terminal block 1, so that this serves as a guide for the ride-up. Thus, the outer fitting is facilitated.

  Further, as shown in FIGS. 4 and 5, each protrusion 51 in which the notch portion 57 is provided in the engagement hook 53 has a rectangular shape from an opening penetrating inward and outward in a plan view behind the notch portion 57. An engagement window 58 is formed. The engagement window 58 is formed with a predetermined width W7 and a predetermined length so that the island-shaped convex portion 15 engages with the waterproof cover 41 when the waterproof cover 41 is externally fitted to the terminal block 1. That is, in the process of covering the waterproof cover 41 on the terminal block 1 from the protruding tip 10 toward the base, the engaging hook 53 in each protruding portion 51 rides on the outer peripheral surface 12a, and the notch 57 in the middle thereof After moving forward across the convex portion 15, that is, after the engaging hook 53 rides on the outer peripheral surface 12 a of the large-diameter portion 12 and elastically deforms outward, it simultaneously engages with the groove-shaped concave portion 13, The island-shaped convex part 15 is set to engage with the engagement window 58. In this engagement, the front end wall 58c of the engagement window 58 is engaged with the rear end wall 15c of the island-shaped convex portion 15 so that the waterproof cover 41 is not pulled out even when pulled backward. (See FIG. 8).

  As shown in FIGS. 4 and 5, the terminal connecting portion receiving portion 47 formed so as to protrude to the rear side of the terminal block swallowing cylinder portion 44 has an outer peripheral surface 47 a that is an outer peripheral surface of the terminal block swallowing tube portion 44. It is formed in an oval shape that is slightly smaller than 44a. Then, behind each terminal connection portion accommodating circular hole 46 surrounding the terminal connection portion, an electric wire that surrounds the coating resin portion of the electric wire 23 within a predetermined range (length range) and is drawn out from the rear of the cover 41, respectively. 23 is formed with a waterproof circular hole 49 for retaining the water resistance around 23. However, the waterproof circular hole 49 has a slightly larger diameter than the terminal connection portion accommodating circular hole 46, and the electric wire having a crease on the outer peripheral surface between the outer peripheral surface of the coating resin of the electric wire 23 passing through the inner hole. Cylindrical waterproofing material (rubber packing) 38 for sealing is press-fitted and formed so that waterproofing is maintained between them (see FIGS. 1 and 10).

  Further, in the outer peripheral surface 47a of the terminal connection portion accommodating portion 47, in the vicinity of the boundary wall with the terminal block swallowing tube portion 44, the same as that formed on the outer peripheral surface 12a near the base of the terminal block 1 along the circumferential direction. In addition, a groove-shaped recess 59 is formed. A resin cap 71 is fitted on the outer peripheral surface 47a of the terminal connection portion accommodating portion 47 from behind to prevent the waterproof material 38 from being separated. The cap 71 is provided with an insertion hole 73 for the electric wire 23 on the rear end surface 72, and the protruding portions 75 and 76 similar to the protruding portions 51 and 52 in the waterproof cover 41 are provided at the opened front. It is provided with an engagement hook 77 protruding inward at its inner tip. Thus, the cap 71 is externally fitted to the terminal connecting portion receiving portion 47 from behind, so that the engaging hook 77 is engaged with and attached to the groove-shaped recess 59 as shown in FIG. The outer peripheral surface 47 a of the terminal connection portion accommodating portion 47 is provided with a fitting convex portion 60 similar to the fitting convex portion 18 described above, and between the protruding portions 75 of the cap 71. A slit 78 into which the convex portion 60 is fitted is formed, and when the cap 71 is attached, the fitting convex portion 60 is tightly fitted into the slit 78.

  Now, in such this form, each electric wire 23 is connected to each electrode terminal 21 of the terminal block 1, and the waterproof material 31 is loaded on the outer peripheral surface 12a of the small-diameter part 11 of the terminal block 1 so as to be waterproof. The cover 41 is covered from the protruding side tip 10 of the terminal block 1 toward the base and is externally fitted to the terminal block 1. Thus, in a state in which the waterproof cover 41 is externally fitted to the terminal block 1, the engagement hooks 53, 54 in the protrusions 51, 52 are engaged with the groove-shaped recess 13 as shown in FIGS. ing. In addition, the island-shaped convex portion 15 is engaged with the engagement window 58 in the protruding portion 51. Then, the waterproof cover 41 is attached. Then, the waterproof material 38 through which the electric wire 23 passes is pushed into the waterproof circular hole 49 from the rear, and then the cap 71 is externally fitted into the terminal connection portion accommodating portion 47, whereby the mounting is completed. However, in the mounting structure of the waterproof cover 41 of this embodiment, the terminal connection portion is not only waterproofed, but the following specific effects are obtained in the waterproofing.

  That is, in the waterproof cover mounting structure of the present embodiment, the island-shaped convex portion 15 provided on the outer peripheral surface 12a of the terminal block 1 and the engagement window 58 provided on the protruding portion 51 of the waterproof cover 41 are engaged. In addition to this, the engagement hook 53 provided on the protruding portion 51 is also engaged with the groove-like recess 13 provided on the outer peripheral surface 12 a of the terminal block 1. That is, it has a double lock structure compared to the conventional single lock structure. For this reason, once the waterproof cover 41 is attached, it is prevented from being easily removed. Therefore, the reliability of waterproofing of the terminal connecting portion can be increased. In addition, in this embodiment, since a large number of places to be engaged are provided along the circumferential direction of the outer peripheral surface 12a of the terminal block 1, the risk of the waterproof cover 41 coming off can be extremely reduced. Further, in this embodiment, the engagement hook 53 in each protrusion 51 includes a notch 57 in the middle in the width direction, so that the process engages with the groove-shaped recess 13 on the outer peripheral surface 12 a of the terminal block 1. In this case, the engagement hook 53 does not have to get over the island-shaped convex portion 15. Therefore, since the protrusion 51 can be embodied with a setting that is not easily elastically deformed, it is possible to obtain an attachment structure that does not easily come off without causing the protrusion to be long.

  In addition, in this embodiment, the fitting protrusions 18 provided on the outer peripheral surface 12a of the terminal block 1 are closely fitted in the slits 55 between the protrusions 51, so that the waterproof cover 41 is twisted. Even if a pulling force acts rearward together with a force and a twisting force, the risk of the waterproof cover 41 being detached from the terminal block 1 can be reduced. That is, since the insertion convex portions 18 are closely fitted in the slits 55 between the protrusions 51, even if a twisting force is applied to the waterproof cover 41, the protrusions 51 are arranged in the width direction. Therefore, it is possible to provide an attachment structure that is less likely to come off. Further, in this embodiment, the interposed waterproof material 31 is connected to the boundary wall surface 14 of the small diameter portion 11 and the large diameter portion 12 of the terminal block 1 and the front end of the terminal block swallowing cylinder portion 44 through the flange portion 35. Since it is sandwiched, high sealing performance is obtained.

  The mounting structure of the waterproof cover 41 of the present invention is not limited to that of the above-described embodiment, and can be embodied with appropriate modifications. For example, in the above embodiment, the case where the island-like convex portion 15 provided on the outer peripheral surface 12a of the terminal block 1 is provided in a portion closer to the protruding tip 10 than the concave portion 13 is described. The convex portion 15 can also be provided at a portion closer to the root than the concave portion 13. In this case, the engaging hook 53 and the engaging window 58 provided on the protruding portion 51 are respectively engaged with the recess 13 and the island-shaped protrusion 15 when the waterproof cover 41 is externally fitted to the terminal block 1. What is necessary is just to form so that it may match.

  Moreover, although the case where the protrusion part which has an engagement window and an engagement hook was provided along the circumference | surroundings of opening (total 10 places) through a slit was demonstrated in the said form, in this invention, the waterproof cover of What is necessary is just to change and set the number and arrangement | positioning suitably according to a shape, a magnitude | size, and also a use. And although the engagement window provided in the protrusion part illustrated what was provided as an opening penetrated in and out in the above-mentioned form, it is clear that it may be concave on the inner surface depending on the thickness of the protrusion part. . In the above embodiment, one protrusion has two engaging hooks separated on both sides with one notch interposed therebetween, and one engaging window is provided. The number may be set as appropriate according to the arrangement of the island-shaped protrusions on the terminal block and the size of the protrusion itself.

  Further, as in the above embodiment, the engagement hook and the engagement window may be provided only on the specific protrusion, or the engagement hook and the engagement window may be provided on all the protrusions. In that case, the island-shaped convex portions and the concave portions formed on the outer peripheral surface of the terminal block may be provided so as to correspond to them. In the above embodiment, the case where the concave portion is provided on the outer peripheral surface of the terminal block as one groove-like thing (groove-shaped concave portion) that is annularly continuous along the circumferential direction has been described. Regardless of the shape or non-groove shape, a plurality of engagement hooks may be provided separately corresponding to each engagement hook or a plurality of engagement hooks.

The exploded perspective view explaining the attachment structure of the waterproof cover of the present invention. The enlarged view of the terminal block of FIG. 1, and its principal part enlarged view. The figure which looked at the terminal block of FIG. 1 from the protrusion side front-end | tip. The enlarged view of the waterproof cover of FIG. The figure which looked at the waterproof cover from the diagonal front side, and the principal part enlarged view. The figure which looked at the waterproof cover from the front side, and its principal part enlarged view. The figure which looked at the waterproof cover from back. The top view of the state which attached the waterproof cover to the terminal block, and the principal part enlarged view. The sectional view on the AA line of FIG. 8, and its principal part enlarged view. The BB sectional view taken on the line of FIG. 8, and its principal part enlarged view. The figure explaining the process in which a waterproof cover is externally fitted to a terminal block. The figure explaining the process in which a waterproof cover is externally fitted to a terminal block.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Terminal block 10 Protrusion side front end 11a, 12a Outer peripheral surface 13 of a terminal block 15 Concave part 15 Island-like convex part 18 Insertion convex part 21 Electrode terminal 23 Electric wire 31 Waterproof material 41 Waterproof cover 42 Front opening 51 of a waterproof cover Projection part 53 Joint hook 58 Engagement window 55 Projection slit

Claims (4)

A waterproof cover in which a cylindrical waterproof cover having an opening on the front side is externally fitted toward the base from the tip of a terminal block having one or more electrode terminals connected to the end of an electric wire through a waterproof material The mounting structure of
On the outer peripheral surface of the terminal block, one or a plurality of island-shaped convex portions are formed along the circumferential direction thereof, and in the outer peripheral surface, the portion closer to the tip or the root than the island-shaped convex portion is provided. While one or more recesses are formed,
The waterproof cover includes one or a plurality of protrusions that protrude forward and are elastically deformed inside and outside the waterproof cover itself, around the front opening thereof, When the waterproof cover is externally fitted to the terminal block, the waterproof cover rides on the outer peripheral surface of the terminal block, elastically deforms outward, and then engages with the engagement hook and the island-shaped protrusion. A mating engagement window,
The waterproof cover mounting structure, wherein the engaging hook in the projecting portion is engaged with the recessed portion, and the island-shaped projecting portion is engaged with the engaging window in the projecting portion.   While the island-shaped convex part is formed closer to the tip of the terminal block than the concave part, the engagement hook of the projecting part is the island-shaped in the process in which the waterproof cover is externally fitted to the terminal block. The waterproof cover mounting structure according to claim 1, wherein the waterproof cover mounting structure is formed so as not to run over the convex portion.   While the island-shaped convex portion is formed closer to the tip of the terminal block than the concave portion, the engagement hook of the projecting portion is formed into the island shape in the process in which the waterproof cover is externally fitted to the terminal block. The waterproof cover mounting structure according to claim 2, wherein the waterproof cover mounting structure is formed so as to straddle the convex portion. The projecting portion is provided by being divided into a plurality of portions through a slit cut at a predetermined width from the front end side to the rear side, and on the outer peripheral surface of the terminal block on which the waterproof cover is fitted. The projections for insertion formed so as to fit closely into the slits are provided, and the projections for insertion are fitted into the slits, respectively. The waterproof cover mounting structure according to claim 1.

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