JP4843331B2 - Electrical component mounting structure - Google Patents

Description

  The present invention relates to a structure for mounting an electrical component when the electrical component used in an apparatus provided on a moving body is earthquake-resistant.

2. Description of the Related Art Conventionally, in various devices, it is generally performed to mount a case on a moving body such as a vehicle or an aircraft in a state where a device including an electrical component is stored in a case with a cover (lid) and unitized. ing. When an electrical component that is vulnerable to vibration is stored in such a case, a failure may occur in the electrical component due to vibration generated when the moving body moves. Therefore, in order to protect an electrical component that is vulnerable to vibration from vibration, it is generally performed that a vibration absorbing member is inserted between the case and a rack (moving body side) for fixing the case to be earthquake resistant (for example, , See Patent Document 1).
Japanese Patent Laying-Open No. 2004-17932 (paragraphs 0012 to 0018, FIG. 1)

  However, as in the prior art, in order to withstand the entire case, it is necessary to insert a vibration absorbing member between the case and the rack, or to increase the thickness of the case or cover, and as a result, the mounting structure is There is a problem that it becomes complicated and the apparatus becomes larger.

  In addition, various devices including electrical components have their own natural frequencies, and the frequency range of vibration as a whole extends over a wide range. Therefore, the vibration can be limited to a certain frequency range and the entire frequency range can be suppressed. There is a problem that the vibration of the range cannot be effectively suppressed.

  Further, when an electric component is attached to the cover, as shown in FIG. 4, when the vibration of the rack as a vibration source is transmitted to the case due to the characteristic of response magnification, the vibration is amplified by X times and transmitted. When the vibration of the case is further transmitted to the cover, the vibration is further amplified by Y times and transmitted, and when the vibration of the cover is further transmitted to the electrical component, the vibration is further amplified by Z times and transmitted. . That is, it is known that the vibration transmitted to the electrical component is transmitted after the rack vibration is amplified by X, Y, and Z times. For this reason, until now, it has not been studied at all to provide the electrical component at a position away from the vibration source.

  An object of the present invention is to solve the above-mentioned conventional problems, and to provide an electric component mounting structure that has a simple structure and that can effectively suppress vibrations to the electric component.

The present invention provides a moving body including a case that houses various devices including electric parts, and a cover that can be freely opened and closed in the case. The case is fixed to a rack of the moving body, and the electric parts are And it is attached to the said cover via the attachment metal fitting which hold | maintains the surroundings in the state wrapped with the vibrational absorption member . Here, the electric component means a component that is weak against vibration.

  According to the present invention, since only the electrical component that needs to suppress vibration is subjected to the earthquake resistance treatment, it is not necessary to select a vibration absorbing member corresponding to vibrations in a wide range of frequencies, and vibration corresponding to only the electrical component. By appropriately selecting the absorbing member, it is possible to effectively suppress vibration with respect to the electrical component. In addition, it is not necessary to apply earthquake-proof processing to the entire case.

  According to the electric component mounting structure of the present invention, the structure is simple, and vibrations to the electric component can be effectively suppressed.

  1 is an external perspective view showing an example of an electrical component mounting structure according to the present embodiment, FIG. 2 is an exploded perspective view showing an electrical component mounting structure on a cover, and FIG. 3 is a diagram showing a state where the electrical component is mounted on the cover. (A) is a front view, (b) is an AA sectional view.

  As shown in FIG. 1, an electrical component 10 according to the electrical component mounting structure of the present invention is housed in a case 20 having a cover 30, and the case 20 is fixed to a rack 2 installed on a moving body 1. It is comprised so that. In addition, the mobile body 1 means various vehicles, such as a railroad, a motor vehicle, an aircraft, a ship, and a rocket.

  The moving body 1 is provided with a rack 2 for fixing the case 20. In this rack 2, for example, fixed portions 3 and 4 made of a pair of thick metal plates are erected at intervals, and the case 3 is provided on the surfaces 3a and 4a of the fixed portions 3 and 4 facing the case 20. Screw holes 3b and 4b (partially not shown) for fixing 20 are formed. Note that the shapes of the rack 2 and the case 20 in the present embodiment are examples, and can be appropriately changed according to the type of the moving body 1 and the installation space.

  The case 20 has a square box shape having an opening S on the front surface, and rack mounting portions 21 and 22 are integrally formed on the left and right side surfaces 20a and 20b. The rack mounting portions 21 and 22 are convex and extend in the vertical direction of the case 20. The rack mounting portions 21 and 22 are formed with a plurality of screw insertion holes 21a and 22a (partially not shown) penetrating in the front-rear direction. A plurality of screw holes 20d are formed on the frame surface 20c facing the front of the case 20 at intervals along the frame.

  Further, various devices including the electrical component 10 are accommodated in the case 20. The electrical component 10 is, for example, an integrated hour meter that indicates how many hours a certain device has been used. Further, as shown in FIG. 2, the electrical component 10 operates at the same time when power is supplied to a power supply device described later, and has a rectangular parallelepiped housing 11. A counter 12 is provided on the front side. The counter 12 is a mechanical type having a vibrator, and includes, for example, a drum type four-digit display section. The configuration of the display unit is an example, and may be other than 4 digits.

  As shown in FIG. 1, various devices housed in the case 20 are used, for example, in a power supply device, and include various detectors such as a printed circuit board 23, a transformer (transformer) 24, an inverter 25, and a voltmeter. (Not shown). The electrical component 10 is connected to the power supply device via the cable C, and the counter 12 operates only when power is supplied to the power supply device so that the total operation time of the power supply device can be measured. It has become. The accumulated hour meter as the electrical component 10 is not limited to the one that measures the accumulated time of the entire power supply device, and may be one that measures the accumulated time of individual devices constituting the power supply device.

  The cover 30 has a quadrangular plate shape that can cover the entire opening S on the front surface of the case 20. A square hole-shaped window portion 31 is formed in the vicinity of the center portion of the cover 30. The screw insertion holes 32 are formed at intervals. Further, in the cover 30, four screw insertion holes 33 (see FIG. 2) for attaching a mounting bracket 13 to be described later are provided in the vicinity of the periphery of the window 31, and are vertically spaced on both the left and right sides of the window 31. It is formed by opening. The electrical component 10 is attached from the back (rear) side of the cover 30 so that the counter 12 of the electrical component 10 can be viewed from the window 31 (see FIGS. 1 and 3A).

  As shown in FIG. 2, the electrical component 10 is attached to the cover 30 via the mounting bracket 13 (13 </ b> A, 13 </ b> B), the vibration absorbing member 14, and the packing 15.

  The mounting bracket 13 includes a base portion 13A having a concave portion 13a that is open in the front-rear direction and the top, and a lid portion 13B. The base portion 13A is formed with a flange 13b extending in the horizontal direction and downward with respect to the concave portion 13a when viewed in plan from the front of FIG. 2, and is laterally defined with respect to the concave portion 13a when viewed in plan from above of FIG. The flanges 13c and 13c are formed so as to extend in the direction. The upper surface of the flange 13b and the upper surfaces of the flanges 13c and 13c are formed in an L shape so as to be continuously on the same surface. In addition, screw holes 13d and 13d are formed on the surface facing the front of the flange 13b in the vertical direction on both the left and right sides, and the surface facing the upper side of the flanges 13c and 13c is spaced in the front-rear direction. Screw holes 13e and 13e are formed. The lid portion 13B has a square plate shape capable of closing the upper portion of the recess 13a, and is formed with screw insertion holes 13f penetrating at positions corresponding to the respective screw holes 13e.

  The vibration absorbing member 14 has a width that can be accommodated in the recess 13a and a length that can cover the surfaces 11a, 11b, 11c, and 11d of the electrical component 10 except for the front and rear of the housing 11. . The material of the vibration absorbing member 14 is preferably selected from a urethane system in terms of a high vibration absorption rate, but is not limited to this, and the frequency range of the natural frequency of the electrical component 10 is not limited thereto. Depending on the material, other materials such as silicone may be used. In addition, the material of the vibration absorbing member 14 can be appropriately changed depending on the size, weight, response magnification, and the like of the electrical component 10.

  The packing 15 is interposed between the mounting bracket 13 and the cover 30, and is formed of, for example, a rubber plate. In addition, the packing 15 is formed with an opening 15a having a larger opening area than the window 31 of the cover 30 at the center thereof, and four penetrations are provided on the left and right sides of the opening 15a with a space in the vertical direction. A hole 15b is formed.

  When the electrical component 10 is attached to the cover in the present embodiment, the electrical component 10 is fitted from above after being placed in the recess 13a of the base portion 13A with the vibration absorbing member 14 folded into a concave shape (see FIG. 2). . The inner dimension of the recess 13a of the base portion 13A is set so that when the electric component 10 is wrapped and held by the vibration absorbing member 14, the electric component 10 does not come out of the base portion 13A and is not rattled. ing. Then, the ends 14a and 14a of the vibration absorbing member 14 are bent inwardly, and the screw 43 is inserted into the screw insertion hole 13f by pressing the lid 11B from above while covering the surface 11d of the casing 11 of the electrical component 10. Then, it is screwed into the screw hole 13e of the base portion 13A.

  In this way, the front surface of the flange 13 b of the mounting bracket 13 is directed toward the rear surface (back surface) of the cover 30 and pressed with the packing 15 sandwiched between the mounting bracket 13 and the cover 30, and the outside of the cover 30. From (front), the screw 44 is inserted into the screw insertion hole 33 and the through hole 15b, and screwed into the screw hole 13d.

  Thus, even if there is a shift due to roughness on the front surface of the flange 13b or the back surface (rear surface) of the cover 30 by mounting via the packing 15, the shift is absorbed and the mounting bracket 13 is attached to the cover 30. Can be attached with improved adhesion. Moreover, when the location where the electrical component 10 is screwed to the cover 30 is, for example, two locations on the left and right, the effect of suppressing vibrations in one direction in the left and right direction can be exhibited, Although the effect cannot be exhibited with respect to vibration, in the present embodiment, the vibration suppressing effect with respect to both the left and right directions and the up and down direction can be exhibited by using four screwed positions. Note that screwing is not limited to four places, and may be five or more places.

  In the present embodiment, since the mounting bracket 13 is provided, the electric component 10 can be held only by the vibration absorbing member 14, so that vibration can be effectively suppressed. Further, since the mounting bracket 13 includes the base portion 13A having the recess 13a and the lid portion 13B, the electrical component 10 can be reliably held with a small number of components.

  In the present embodiment, as shown in FIG. 3B, the depth dimension L2 of the mounting bracket 13 (base portion 13A) is formed shorter than the depth dimension L1 of the electrical component 10. In this way, by setting L2 <L1, it is possible to suppress vibration when vibration is transmitted. Furthermore, by setting (L1 / 2) ≈L2, the electric component 10 can be attached to the mounting bracket 13 without rattling, and the weight can be reduced.

  Then, after positioning the cover 30 to which the electrical component 10 is attached to the case 20 as described above, the screw 41 is inserted into the screw insertion hole 32 and fixed to the screw hole 20d. Then, the screw 42 is inserted into the screw insertion holes 21 a and 22 a of the rack mounting portions 21 and 22 of the case 20 and fixed to the screw holes 3 b and 4 b to fix the case 20 to the rack 2. In the present embodiment, the case 20 is directly fixed to the rack 2 with screws 42 without using a vibration absorbing member.

  By the way, providing the cover 30 with the electrical component 10 that is susceptible to vibration means that it is installed at a place where vibration is most amplified, as described with reference to FIG. However, in this embodiment, the electrical component 10 that is weak against vibration is installed on the cover 30. Therefore, in the present embodiment, the entire case 20 is not quake-resistant, but only the electrical component 10 (here, a mechanical time meter) that is vulnerable to vibration is attached to the cover 30 via the vibration absorbing member 14. Since it is not necessary to increase the thickness of the case 20 or the cover 30 or to provide a vibration absorbing member between the case 20 and the rack 2, which has been conventionally performed in order to make the entire case 20 seismic resistant. It becomes possible to reduce the installation size of the.

  Further, by configuring as described above, vibration transmitted to the electrical component 10 can be effectively suppressed even under severe vibration conditions such as an aircraft. Furthermore, since the selection range of the electrical component 10 can be widened, it is possible to use a standard product instead of an expensive product that satisfies a high earthquake resistance standard, thereby reducing costs.

  In the present embodiment, as an electric component that is vulnerable to vibration, an integrating hour meter has been described as an example. However, the present invention is not limited to this.

It is an external appearance perspective view which shows an example of the attachment structure of the electrical component of this embodiment. It is a disassembled perspective view which shows the attachment structure to the cover of an electrical component. The state in which the electrical component is attached to the cover is shown, (a) is a front view, and (b) is a cross-sectional view along AA. It is a conceptual diagram for demonstrating response magnification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile body 2 Rack 10 Electrical component 12 Counter 13 Mounting bracket 13a Recessed part 13A Base part 13B Cover part 14 Vibration absorption member 20 Case 30 Cover 31 Window part

Claims (4)

In a moving body comprising a case that houses various devices including electrical parts, and a cover that can be freely opened and closed in the case,
The case is fixed to a rack of the movable body;
The electrical component mounting structure is characterized in that the electrical component is attached to the cover via a mounting bracket that holds the periphery of the electrical component wrapped in a vibration absorbing member . 2. The electrical component mounting structure according to claim 1 , wherein the mounting bracket includes a base portion that has a recess and accommodates the electrical component, and a lid portion that closes the recess. The electrical component mounting structure for an electric part according to claim 1 or claim 2, wherein the integration is time meter. The electric part mounting structure according to claim 3 , wherein the cover is provided with a window portion for visually recognizing the counter of the accumulated hour meter.

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