JP3982384B2 - Electric junction box mounting structure with bolts and nuts - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric junction box mounting structure using bolts and nuts, and more particularly, to prevent vibration transmission between an electric junction box and a vehicle body panel joined by bolts and nuts.
[0002]
[Prior art]
An electrical junction box used in an automobile is equipped with an internal circuit formed by a bus bar, a relay, and a fuse, and a bracket provided on the case is fixed to the automobile and mounted on the automobile.
As an attachment structure of the electrical junction box to the vehicle, for example, as shown in FIG. 7, there is provided an attachment structure of the electrical junction box 1 to the vehicle body panel 5 as disclosed in Japanese Patent Application Laid-Open No. 2001-182732. Has been. In the electrical junction box 1, the insertion hole 2 a of the bracket 2 protruding integrally from the case is matched with the bolt hole 5 a formed in the vehicle body panel 5, and the bolt 3 is attached to the insertion hole 2 a and the bolt hole 5 a with the washer 4. The electrical connection box 1 is fixed to the vehicle body panel 5 by being passed through and fastened with a nut (not shown).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-182732 [0004]
[Problems to be solved by the invention]
However, since the bracket 2 provided integrally with the electric connection box 1 is directly brought into contact with the vehicle body panel 5 and fastened and fixed with the bolt 3, the electric connection box 1 is mounted with a relay such as a relay box. In such a case, the operation sound and vibration generated when the relay contacts are opened and closed may be transmitted to the vehicle body panel 5 via the bracket 5, and the transmitted operation sound and vibration are amplified by the vehicle body panel 5 and resonant. As a result, there was a problem affecting the quiet performance of automobiles.
In particular, when relays such as hybrid cars and electric vehicles have high voltage and high current specifications, a large force is applied to the relay contact opening / closing operation, which increases operating noise and vibration, and transmits abnormal noise to the vehicle interior. It becomes easy to be done.
[0005]
This invention is made | formed in view of the said problem, and makes it the subject to prevent the vibration transmission between the electric junction box joined by a volt | bolt and a nut, and a vehicle body panel.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a bolt through hole formed in a body panel fixing bracket and a vehicle body panel projecting from a case of an electrical junction box. In the mounting structure of the electrical junction box, where nuts are arranged on the periphery, bolts are passed from the bracket side through the bolt through holes and fastened with the nuts,
A cylindrical collar and a flat washer with a collar provided with a flat washer protruding in a bowl shape from only one end of the collar;
A collar-covered cylinder portion covering the entire outer peripheral surface of the collar portion of the collar washer, and a plain washer covering portion covering the outer peripheral surface from the back surface of the plain washer portion of the collar plain washer to cover the outer peripheral portion of the surface. Anti-vibration rubber covering material,
Using a ring-shaped anti-vibration rubber flat seat provided separately from the anti-vibration rubber covering material,
The bolt through hole of the bracket, the color of the color with plain washer coated with an outer peripheral surface in the color coating cylinder portion of the vibration damping rubber dressing to fit into is inserted from the bolt insertion side, the bracket and bolt Rutotomoni is interposed the vibration damping rubber coating material, by interposing the vibration damping rubber-made flat seat between the bracket and the vehicle body panel, these bolts and the bracket, the bracket and the vehicle body panel and each of the non-contact between the An electrical connection box mounting structure is provided by bolts and nuts that are configured not to transmit vibration of the electrical connection box to the vehicle body panel.
[0007]
With the above structure, even if the operation sound / vibration of the contact opening / closing operation of the relay occurs in the electrical junction box, the anti-vibration rubber is attached to the bolt tightening portion that is a contact portion between the bracket of the electrical junction box and the vehicle body panel. The bracket and the vehicle body panel are not in direct contact with each other by interposing a collar washer covered with a covering material and an anti-vibration rubber flat seat so that the anti-vibration rubber covering material and anti-vibration rubber flat seat described above are used. By absorbing the vibration, it is possible to prevent the operating sound and vibration in the electrical junction box from being transmitted to the vehicle body panel side.
Moreover, since the collar-equipped plain washer coated with the anti-vibration rubber coating material is provided with a collar that fits inside the bolt through-hole of the bracket, the anti-vibration rubber is also provided between the bracket through-hole and the bolt. Since the covering material is interposed, vibration on the bracket side of the electrical junction box can be reliably prevented from being transmitted to the vehicle body panel via the bolt.
[0008]
Of course, even when vibration occurs on the body panel side, the anti-vibration rubber covering material and the anti-vibration rubber flat seat serve to absorb vibrations and prevent vibration from being transmitted to the electrical junction box. It is also possible to prevent the malfunction of electronic components inside.
The vehicle equipped with the electric junction box is a hybrid or an electric vehicle, and the electric junction box is composed of a relay box, and the operation sound and vibration at the time of the relay contact opening / closing operation in the relay box are large. In particular, the anti-vibration effect is demonstrated.
[0009]
As a specific structure, the collar portion of the flat washer with the collar has an axial length longer than the length of the bolt through hole of the bracket by the approximate thickness of the anti-vibration rubber flat seat, The diameter is larger than the bolt head ,
The anti-vibration rubber flat seat is fitted on the outer peripheral surface of the color-coated cylinder portion of the anti-vibration rubber covering material.
[0010]
It is preferable that the anti-vibration rubber covering material for covering the collared plain washer is attached with a double-sided adhesive tape at the back face position of the plain washer and adhered to the periphery of the bolt through hole.
[0011]
That is, by attaching a double-sided adhesive tape to the surface of the anti-vibration rubber covering material facing the bracket, the collared plain washer covered with the anti-vibration rubber covering material is fitted in the bolt through hole. Thus, it is possible to improve the workability because the operator does not need to perform the bolt fastening operation while holding the collar-equipped plain washer covered with the anti-vibration rubber coating material.
If a release paper is attached to the back side of the flat washer that faces the bracket of the double-sided adhesive tape, the adhesive surface can be protected before use, and the release paper is peeled off during use. Just good and convenient.
[0012]
It is also preferable to attach a double-sided adhesive tape to the surface of the anti-vibration rubber flat seat and bond it to the periphery of the bolt through hole on the vehicle body panel side.
That is, by attaching a double-sided adhesive tape to the surface of the anti-vibration rubber flat seat facing the bracket, the anti-vibration rubber flat seat can be adhered and held to the bracket, so that the operator can It is not necessary to perform the bolt fastening operation while holding the rubber flat seat, and the workability can be improved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, a relay box (electric connection box) 20 in which a relay 30 or the like is mounted is bolted to a vehicle body panel P of an electric vehicle or a hybrid vehicle having gasoline and electricity as drive sources via a bracket 21b. The state is shown, and a flat washer 12 with a collar and an anti-vibration rubber flat seat 13 whose outer surfaces are covered with an anti-vibration rubber covering material 11 between the vehicle body panel P and the bolt B and the bracket 21b are used as the vibration absorbing material 10. It is assembled by interposing.
[0014]
The relay box 20 includes a main body case 21 and a cover 22, and the main body case 21 projects a locked portion 21 a above the side surface, and projects a bracket 21 b integrally from the side surface. A bolt through hole 21b-1 is drilled at the tip. The cover 22 is provided with a locking portion 22 a on the lid-shaped side surface, and the locking portion 22 a of the cover 22 is locked to the locked portion 21 a of the main body case 21.
[0015]
As shown in FIGS. 2 and 3, the vibration absorbing material 10 includes a collared flat washer 12, a vibration-proof rubber covering material 11 that covers the outer surface of the color-washed flat washer 12, and a vibration-proof rubber flat seat 13. It has.
The collar-equipped plain washer 12 is made of metal, and includes a cylindrical collar portion 12a and a flat washer portion 12b that protrudes in a horizontal shape from the lower end of the collar portion, and the axial length of the collar portion 12a is In addition, the length of the flat washer 13 made of anti-vibration rubber is set longer than the length of the bolt through hole 21b-1 of the bracket 21b, and the diameter of the flat washer portion 12b is larger than the head Ba of the bolt B. Yes.
[0016]
The anti-vibration rubber covering material 11 is made of rubber or elastomer, and is formed of EPDM rubber in the present embodiment, and has a cylindrical color covering cylinder portion 11a and a bowl shape in the horizontal direction from the lower end of the color covering cylinder portion 11a. A protruding flat washer covering portion 11b and an annular recessed portion 11d recessed on the inner surface side of the flat washer covering portion 11b are provided. Note that the lower end portion 11c of the flat washer covering portion 11b protrudes slightly inward.
[0017]
The anti-vibration rubber flat seat 13 is made of rubber, elastomer, or silicon. In this embodiment, the anti-vibration rubber flat seat 13 is a ring-shaped flat seat formed of EPDM rubber. It is set as the magnitude | size externally fitted by the color coating | coated cylinder part 11a.
[0018]
The above-mentioned anti-vibration rubber covering material 11 is used by being mounted on a flat washer 12 with a collar.
Specifically, as shown in FIGS. 3A and 3B, the collar portion 12a of the flat washer 12 with a collar is inserted from below the anti-vibration rubber coating material 11 and fitted into the collar-coated cylinder portion 11a. The washer portion 12b is mounted by being fitted into the annular recess 11d of the flat washer covering portion 11b. At this time, since the plain washer portion 12b is structured to be fitted into the annular recess 11d, it is possible to prevent the collar-equipped plain washer 12 from falling off from the anti-vibration rubber covering material 11. Further, since the protruding amount of the lower end portion 11c of the collar-covered cylinder portion 11b is small, the contact surface of the bolt head portion Ba of the flat washer portion 12b and the contact surface of the impact wrench that holds the bolt and tightens the bolt are tightened. In order to ensure, the central part of the surface is not covered and is exposed.
[0019]
Next, a procedure for fastening the electric connection box 20 to the vehicle body panel P with bolts B using the color plain washer 12 with the vibration proof rubber covering material 11 and the vibration proof rubber flat seat 13 as the vibration absorbing material 10 will be described.
[0020]
As shown in FIG. 4 and FIG. 5, the collar plain washer 12 with the vibration-proof rubber covering material 11 is inserted into the bolt through hole 21b-1 of the bracket 21b of the electrical junction box 20 from the bolt B insertion side to cover the collar portion 12a. The collar covering cylinder portion 11a is fitted into the bolt through hole 21b-1, and the upper surface of the flat washer covering portion 11b covering the plain washer portion 12b is brought into contact with the peripheral edge of the bolt through hole 21b-1 of the bracket 21. The
Next, the anti-vibration rubber flat seat 13 is fitted on the outer peripheral surface of the collar-covered cylinder portion 11a slightly protruding from the bolt through hole 21b-1, and is placed on the body panel P contact side of the bracket 21b.
[0021]
Then, as shown in FIGS. 1A and 1B, the shaft portion Bb of the bolt B is penetrated from the bracket 21b side to the collar portion 12a of the flat washer 12 with the collar, and the periphery of the bolt through hole on the vehicle body panel P side. The nut N is disposed and fastened, and the head Ba of the bolt B is pressed against the flat washer 12b of the flat washer 12 with a collar.
[0022]
According to the mounting structure, since the vibration isolating rubber flat seat 13 is interposed between the bracket 21b of the electrical junction box 20 and the vehicle body panel P and is not in direct contact, the contact of the relay 30 generated in the electrical junction box 20 It is possible to prevent the opening / closing operation sound / vibration from being absorbed by the anti-vibration rubber flat seat 13 and directly transmitted to the vehicle body panel P.
Further, since the vibration isolating rubber flat seat 12 covered with the anti-vibration rubber covering material 11 is interposed between the bolt B in contact with the vehicle body panel P and the bracket 21b, the vibration of the bracket 21b causes the bolt to vibrate. Indirect transmission to the vehicle body panel P through B can also be prevented.
Therefore, the noise transmission effect is exhibited by preventing the vibration transmission, and the quiet performance of the automobile is improved. In the actual measurement by the present inventor, noise of 75 db in the conventional mounting structure can be reduced to 55 db in the mounting structure of the present invention.
[0023]
In addition, in the state in which the anti-vibration rubber flat seat 13 is assembled to the collared flat washer 12 covered with the anti-vibration rubber covering material 11 at the time of mounting, the shape is an I-shaped cross-section of the bobbin. In addition, the collared flat washer 12 and the ring-shaped anti-vibration rubber flat seat 13 which are covered with the anti-vibration rubber covering material 11 having a convex cross section are separately provided, so that the bolt through hole 21b of the bracket 21b is separated. Since it is not necessary to cut out -1 in a U shape and can be attached, the strength of the bracket 21b can be prevented from being lowered.
[0024]
Even when vibration is generated on the vehicle body panel P side, the plain washer 12 with the collar and the flat seat 13 made of the anti-vibration rubber covered with the anti-vibration rubber covering material 11 play a role of vibration absorption. It is possible to prevent vibration from being transmitted to the electrical junction box 20 via the.
Further, the vibration absorbing material 10 composed of the anti-vibration rubber covering material 11, the collar-equipped flat washer 12 and the anti-vibration rubber flat seat 13 is not limited to the case where the electric junction box 20 is attached to the vehicle body panel P. Needless to say, the present invention can be used for any application in which a bracket is fixed to a bracket by fastening.
[0025]
FIG. 6 shows a second embodiment.
The difference from the first embodiment is that the double-sided adhesive tape 14 is attached to the back surface position (contact surface with the bracket 21b) of the flat washer covering portion 11b of the anti-vibration rubber covering material 12 covering the flat washer 11 with collar. It is a point.
[0026]
The double-sided adhesive tape 14 has an annular shape and is adhered to the contact surface of the flat washer covering portion 11b with the bracket 21b, and the exposed surface is affixed with a release paper 15 so that it can be stored and transported before use. The adhesive surface is protected.
In use, the release paper 15 is peeled off and adhered to the peripheral edge of the bolt through hole 21b-1 of the bracket 21b, so that the collared plain washer 11 covered with the anti-vibration rubber covering material 12 is adhered to the bracket 21. Can be retained. With the above configuration, the operator does not need to perform the bolt B fastening operation while holding the collar-equipped flat washer 12 covered with the anti-vibration rubber coating material 11, and the workability can be improved.
In addition, you may affix a double-sided adhesive tape also on the surface facing the bracket 21b of the anti-vibration rubber flat seat 13. Then, in the same manner as described above, the anti-vibration rubber flat seat 13 can be adhered and held to the bracket 21b, so that it is not necessary for the operator to hold the anti-vibration rubber flat seat 13, and the workability is further improved. Can be improved.
[0027]
【The invention's effect】
As is clear from the above description, according to the present invention, the flat washer with the collar coated with the vibration-proof rubber covering material is applied to the bolt tightening portion which is the contact portion between the electric junction box and the vehicle body panel. And the anti-vibration rubber flat seat, so that the bracket and the bracket are not in direct contact, so even if vibration occurs in the electrical junction box or body panel, the anti-vibration rubber coating and anti-vibration rubber The flat seat can absorb the vibration and prevent the vibration from being transmitted to the other party.
In addition, the collar-equipped plain washer coated with the anti-vibration rubber coating material is provided with a collar portion that fits in the bolt through hole of the bracket of the electrical connection box, and the anti-vibration rubber coating is also provided between the bracket and the bolt. Since the material is interposed, indirect vibration transmission through the bolt can also be reliably prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a mounting structure of an electrical junction box according to a first embodiment of the present invention, and FIG.
FIG. 2 is a perspective view showing an anti-vibration rubber covering material, a flat washer with a collar, and an anti-vibration rubber flat seat.
FIGS. 3A and 3B are cross-sectional views showing the assembly of the vibration-proof rubber covering material and the collared plain washer.
FIG. 4 is a perspective view of a collared plain washer covered with an anti-vibration rubber covering material and an anti-vibration rubber flat seat before mounting on a bracket.
FIG. 5A is a perspective view of a collared plain washer covered with a vibration proof rubber coating material and a vibration proof rubber flat seat after being mounted on a bracket, and FIG. 5B is a sectional perspective view.
FIG. 6 is a perspective view showing a plain washer with a collar coated with a vibration-proof rubber covering material of a second embodiment, and (B) is a cross-sectional view after mounting.
FIG. 7 is a view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Anti-vibration rubber | gum covering material 11a Collar covering cylinder part 11b Flat washer clothing part 12 Collared flat washer 12a Collar part 12b Flat washer part 13 Anti-vibration rubber flat sheet 14 Double-sided adhesive tape 15 Release paper 20 Relay box (electric connection box)
21b Bracket 21b-1 Bolt through hole B Bolt N Nut P Car body panel

Claims (4)

Bolt through holes are drilled in the body panel fixing bracket and the vehicle body panel that protrude from the case of the electrical junction box, and nuts are placed around the bolt through holes on the body panel side. In the mounting structure of the electrical junction box that is fastened and fixed with the nut through the bolt through hole,
A cylindrical collar and a plain washer with a collar provided with a flat washer protruding in a bowl shape from only one end of the collar;
A collar-covered cylindrical portion that covers the entire outer peripheral surface of the collar portion of the flat washer with the collar, and a plain washer-covering portion that covers the outer peripheral surface from the back surface of the flat washer portion of the flat washer with the collar and covers the outer peripheral portion of the surface. Anti-vibration rubber covering material,
Using a ring-shaped anti-vibration rubber flat seat provided separately from the anti-vibration rubber covering material,
The bolt through hole of the bracket, the color of the color with plain washer coated with an outer peripheral surface in the color coating cylinder portion of the vibration damping rubber dressing to fit into is inserted from the bolt insertion side, the bracket and bolt Rutotomoni is interposed the vibration damping rubber coating material, by interposing the vibration damping rubber-made flat seat between the bracket and the vehicle body panel, these bolts and the bracket, the bracket and the vehicle body panel and each of the non-contact between the Electric junction box mounting structure with bolts and nuts that prevents the vibration of the junction box from being transmitted to the vehicle body panel. The collar portion of the collar washer has a shaft length that is longer than the length of the bolt through hole of the bracket by the thickness of the anti-vibration rubber flat seat, and the plain washer portion is larger than the bolt head. The diameter ,
2. The electric junction box mounting structure using bolts and nuts according to claim 1, wherein the anti-vibration rubber flat seat is externally fitted to the outer peripheral surface of the collar-coated cylinder portion of the anti-vibration rubber covering material.   The anti-vibration rubber coating material covering the plain washer with the collar is attached to the periphery of the bolt through hole by attaching a double-sided adhesive tape to the back surface of the flat washer. The mounting structure for an electric junction box using bolts and nuts according to claim 1 or 2, wherein a double-sided adhesive tape is attached to the surface of the seat and adhered to the periphery of the bolt through hole on the vehicle body panel side.   The vehicle on which the electric junction box is mounted is a hybrid or an electric vehicle, and the electric junction box is composed of a relay box, and the operation sound and vibration at the time of the relay contact opening / closing operation in the relay box are large. The mounting structure of the electric junction box according to any one of Claims 3 by using a strange bolt and nut.

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