JP5828313B2 - Electrical equipment case - Google Patents

Description

  The present invention relates to an electrical device case that houses electronic components and a terminal block.

  The case of the electric device includes a case body and a cover. In an electric equipment case, a soundproof material may be disposed between the case body and the cover so as to prevent noise from leaking to the outside as much as possible. For example, Patent Document 1 discloses a technique for disposing a seal member between a case body and a cover so as not to leak the noise of the motor to the outside with respect to a terminal case attached to the motor of an electric vehicle. The seal member serves as a soundproofing material, and noise leakage to the outside is reduced.

JP 2008-301541 A

  When the cover is attached to the case body, there is a place where the case body and the cover are in direct contact. Alternatively, when the cover is attached via a washer or a flat plate, the washer or flat plate is in direct contact with the case body and exposed to the outside. For example, a protrusion for receiving a bolt for attaching the cover is present in the case body opening, but the top surface of the protrusion is in direct contact with the back surface of the cover, or the back surface of the washer or flat plate. On the other hand, in order to enhance the soundproofing effect, the sealing material (soundproofing material) must be a soft material. If a soft sealant is sandwiched between the top surface of the protrusion of the case body and the back of the cover (or the back of the washer or flat plate) to enhance the soundproofing effect, the sealant will tear or the bolts will be loose The cover is not fixed securely. If the sealing material is disposed avoiding the protrusion, sound leaks from between the protrusion and the sealing material. If a soft sealing material is disposed directly around the protrusion, the sealing material may be wound between the top of the protrusion and the cover due to its flexibility. The present specification provides an electrical device case excellent in soundproofing between a case body and a cover.

  An electrical device case disclosed in the present specification includes a case main body and a cover that covers an opening of the case main body. A protrusion having an insertion hole for a bolt for attaching a cover on the top surface (upper surface) is provided in the opening of the case body. A rib is provided so as to surround the periphery of the protrusion. And the soundproof material is attached to the outer periphery of a rib. The rib may be provided on the cover or may be provided on the case body.

  In the electrical device case described above, a soundproof material (seal material) is not provided on the top surface of the protrusion that directly contacts the back surface of the cover (or the back surface of the washer or flat plate). Instead, a rib is provided around the protrusion, and a soundproof material is attached around the rib. The soundproofing material reduces noise leaking to the outside through the periphery of the protrusion. Since the soundproofing material is attached to the rib, the soundproofing material is not caught between the protrusion and the cover.

  When the cover is made of resin, the rib extends from the back surface of the cover and is preferably made of resin. This is because the resin cover and rib are more excellent in soundproofing than metal.

  As described above, the cover may be fixed to the case body with a bolt via a flat plate attached to the top surface of the protrusion. In that case, the cover is provided with a hole through which the protrusion passes. A rib is provided around the hole. The flat plate for fixing the cover may be a simple flat plate or a bracket having a function of fastening other devices and cables.

  Details and further improvements of the technology disclosed in this specification will be described in the following “DETAILED DESCRIPTION”.

It is a disassembled perspective view of the electric equipment case of an Example. It is sectional drawing in the II-II arrow of FIG. It is sectional drawing of the electric equipment case of a modification.

  An electrical device case 2 according to an embodiment will be described with reference to the drawings. The electric device case 2 is a terminal box that is mounted on an electric vehicle, is attached to a housing of a motor, and houses a terminal for connecting a power cable that supplies power to the motor. Since vibration noise from the motor enters the electric device case 2, it is not desirable to leak the noise from the electric device case as much as possible. The electric device case 2 of the embodiment particularly reduces noise leakage between the case main body 10 and the cover 4. Hereinafter, the electric device case 2 is simply referred to as case 2.

  FIG. 1 shows an exploded perspective view of the case 2, and FIG. 2 shows a cross-sectional view taken along the line II-II in FIG. The case 2 includes a case main body 10 and a cover 4 that covers the opening. The case body 10 is made of aluminum, for example, and the cover 4 is made of resin. The cover 4 is fixed to the case body 10 with bolts 9 through the metal bracket 3. The bracket 3 is a metal fitting for guiding a power cable drawn into the electric device case 2 and is provided with a flange 3b having a hole for locking the power cable.

  A cable terminal or the like is stored in the case body 10, and an inner lid 14 that covers the cable terminal or the like is detachably attached above the space 91 in the case. The illustration of the attachment / detachment structure of the inner lid 14 is omitted. Further, illustration of cable terminals and the like stored in the case internal space 91 is also omitted.

  A protrusion 12 is provided at the approximate center of the inner lid 14. In other words, the protrusion 12 is provided in the opening of the case body 10. The protrusion 12 is provided to fix the bracket 3 and the cover 4, and a bolt hole 13 is provided on the top surface thereof. The bracket 3 has a through hole 3 a at a position corresponding to the bolt hole 13 of the protrusion 12, and the bracket 3 is fixed to the protrusion 12 (case body 10) through the bolt 9 in the through hole 3 a.

  A cover 4 is sandwiched between the protrusion top surface of the case body 10 and the bracket 3. In other words, the cover 4 is fixed to the case body 10 with the bolts 9 via the bracket 3. The cover 4 seals the upper surface of the peripheral wall 15 around the opening of the case body 10 and also plays a role of soundproofing. The top surface of the protrusion 12 is slightly higher than the top surface of the peripheral wall 15 of the opening of the case body 10, and when the bracket 3 is fixed to the top surface of the protrusion 12, the top surface of the bracket 3 is between the back surface of the bracket 3 and the top surface of the peripheral wall 15. A slight gap is formed, the cover 4 is sandwiched in the gap, and the space between the peripheral wall 15 is tightly sealed.

  An opening 4a is provided at a position substantially in the center of the cover 4 and corresponding to the protrusion 12. When the cover 4 is attached, the top surface of the protrusion 12 is exposed through the opening 4a, and the bracket 3 is exposed on the top surface. The back of the touches. The bracket 3 is fixed to the case body 10 with bolts 9. The rear surface of the bracket 3 directly contacts with the case main body 10 (the top surface of the protrusion 12) and is firmly fixed with the bolt 9. Therefore, the cover 4 sandwiched between the projection top surface and the bracket 3 is also firmly fixed.

  Ribs 5 are provided around the opening 4 a of the cover 4. As shown in FIG. 2, the rib 5 is provided so as to surround the protrusion 12 when the cover 4 is attached to the case body 10. A soundproof material 21 is attached to the outside of the rib 5. The soundproof material 21 covers from the back surface of the cover 4 to the surface of the inner lid 14 along the ribs 5. As shown in FIG. 2, the protrusion 12 of the case body 10 is surrounded by a soundproof material 21. Therefore, noise leaking through the periphery of the protrusion 12 is reduced. In addition, a soundproof material is affixed on the inner surface of the surrounding wall 15 which is the upper surface of the inner lid 14 (soundproof material 22 in FIG. 2). The sound leakage material 22 inside the peripheral wall 15 also reduces noise leaking out from the case body 10. The soundproof materials 21 and 22 are made of a material having excellent sound absorbing properties such as urethane foam.

  FIG. 3 shows a cross-sectional view of a case 2a according to a modification. The case 2 a does not include the bracket 3 of FIG. 1, and the cover 104 is directly fixed to the protrusion 12. The cover 104 is fixed with bolts 9 from above with the back surface in contact with the top surface of the protrusion. Ribs 5 are provided so as to surround the protrusion 12 on the back surface of the cover 104. A soundproof material 21 is attached to the outer periphery of the rib 5. The soundproof material 21 extends so as to cover from the back surface of the cover 104 to the surface of the inner lid 14. A soundproof material 22 is also attached to the inside of the peripheral wall 15 of the opening of the case body 10 above the inner lid 14.

  The modified case 2 a is also provided with a rib 5 so as to surround the protrusion 12, and a soundproof material 21 surrounding the protrusion 12 together with the rib 5 is attached to the outer periphery of the rib 5. With such a structure, noise leaking from around the protrusion 12 for fixing the cover 104 is reduced. Further, the soundproof material 22 attached to the inside of the opening peripheral wall 15 of the case body 10 also contributes to the reduction of noise leaking outside. The space 92 between the inner soundproof material 21 and the outer soundproof material 22 may be filled with the soundproof material.

  Points to be noted regarding the technology described in the embodiments will be described. The bracket 3 shown in FIGS. 1 and 2 corresponds to an example of a flat plate for fixing the cover 4 to the case body.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

2, 2a: Electrical device case 3: Bracket 3a: Through hole 3b: Flange 4, 104: Cover 4a: Opening 5: Rib 9: Bolt 10: Case body 12: Projection 13: Bolt hole (insertion hole)
14: Inner lid 15: Peripheral wall 21, 22: Soundproof material

Claims (3)

The case body,
A cover covering the opening of the case body;
A protrusion provided in the opening of the case body and having a bolt insertion hole on the top surface for attaching a cover;
A rib surrounding the periphery of the protrusion,
Soundproofing material attached to the outer periphery of the rib;
An electrical equipment case comprising:   The electric device case according to claim 1, wherein the rib extends from a back surface of the cover. The cover is provided with a hole through which the protrusion passes and a rib is provided around the hole.
The electric device case according to claim 2, wherein the cover is fixed to the case main body with a bolt via a flat plate attached to the top surface of the protrusion.

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