JP2012136072A - Vehicle body fixing structure for vibration generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle body fixing structure for a vibration generator that can serve as a vibration controlling function while not increasing the number of component items and facilitating assembly.SOLUTION: In the fixing structure, a PCU case 12 for generating high-frequency vibration is fixed to a vehicle body 1 via an attachment member 14, one end 24 of which is coupled with the PCU case 12 and the other end 28 of which is coupled with the vehicle body 1. A spring mass element 20 is integrally formed as a part in an attachment part 16 of the PCU case 12 with which the attachment member 14 is coupled so that the spring mass element 20 functions as a dynamic dumper.

Description

  The present invention relates to a vehicle body fixing structure for a vibration generator, and more particularly to a fixing structure for fixing a vibration generator that generates high-frequency vibrations to a vehicle body via an attachment member.

  Conventionally, for example, Japanese Unexamined Patent Application Publication No. 2009-120109 (hereinafter referred to as Patent Document 1) discloses a vehicle body housing fixing structure that is intended to suppress vibration transmission between an inverter and a vehicle body.

  This vehicle body housing fixing structure fixes an inverter housing housing an inverter to a vehicle body, and includes a housing side bracket fixed to the inverter housing and a vehicle body side bracket fixed to the vehicle body. Each of the housing-side bracket and the vehicle body-side bracket has a base portion having a fixed flat portion that is fixed in contact with the inverter housing or the vehicle body, and a mating bracket coupling portion that is coupled to the mating bracket. Further, the mating bracket coupling portion is provided at the distal end portion of the bent portion that is bent toward the mating bracket side continuously from both end portions of each base portion.

  In the above-described vehicle body housing fixing structure configured as described above, each of the housing side bracket fixed in contact with the inverter housing by the base portion and the vehicle body side bracket fixed in contact with the vehicle body at the base portion is provided. They are coupled and fixed to each other by a mating bracket coupling portion at the tip of a bent portion continuous from both ends of the base portion. As a result, a space is provided between the housing side bracket and the vehicle body side bracket, and the positions of the inverter housing and the bracket side bracket fixing portion and the vehicle body and the vehicle body side bracket are separated from each other between the inverter housing and the vehicle body. It is described that the length of the vibration transmission path can be increased, and as a result, the transmission of vibration between the inverter and the vehicle body can be suppressed by the distance attenuation effect.

JP 2009-120109 A

  However, the vehicle body housing fixing structure of Patent Document 1 requires two members, a housing side bracket and a vehicle body side bracket, to fix the inverter housing to the vehicle body, and there is a problem that the number of parts increases. In addition, there is a problem in that it takes time to assemble the two brackets that must be combined and assembled to the vehicle body.

  An object of the present invention is to provide a vehicle body fixing structure for a vibration generator that can perform a vibration suppressing function without increasing the number of parts and facilitating assembly.

  A vibration generator body fixing structure according to the present invention is a fixing structure for fixing a vibration generator for generating high-frequency vibrations to a vehicle body via an attachment member, and one end of the attachment member is attached to the vibration generator. The other end of the vibration generator is connected to the vehicle body or a case fixed to the vehicle body, and the vibration generator is attached to the attachment member, the attachment member, and the side wall of the case. In one, a spring mass element is integrally formed as a part thereof, thereby providing a dynamic damper function.

  In the vehicle body fixing structure of a vibration generator according to the present invention, the mounting portion of the mounting member is a fastening portion that protrudes from a side surface of the vibration generator and has a screw insertion hole, and the spring mass element is disposed on the side surface. On the other hand, it may be provided by forming a notch at the tip of the fastening part located farther than the screw insertion hole.

  Further, in the vehicle body fixing structure for a vibration generator according to the present invention, the cuts in the fastening portion may be formed so as to partition a spring portion having a small width or thickness and a mass portion having a large width or thickness. .

  Further, in the vehicle body fixing structure for a vibration generator according to the present invention, a plurality of notches may be formed at the tip of the fastening portion to form a plurality of spring mass elements.

  Moreover, in the vehicle body fixing structure for a vibration generator according to the present invention, the mounting member is a bracket formed by bending a metal plate, and the bracket is fastened to the mounting portion of the vibration generator by a screw. An upper end fastening portion, two leg portions that are bent and extended on both sides from the upper end fastening portion, and a lower end fastening portion that is bent from the leg portion and fastened to a fixed object fixed to the vehicle body by a screw. The upper end fastening portion of the bracket may have an extension portion that extends more than necessary for fastening the attachment portion, and the spring mass element may be formed by forming a cut in the extension portion.

  In the vehicle body fixing structure for a vibration generator according to the present invention, the tip of the extension may be bent with respect to the extension direction.

  Moreover, in the vehicle body fixing structure of a vibration generator according to the present invention, the vibration generator may be a case for a power control device that houses a power control device including a reactor.

  Furthermore, in the vehicle body fixing structure of a vibration generator according to the present invention, the vibration generator is a reactor, and the mounting member is a fixing member for fixing the reactor to a reactor case made of a metal casing that houses the reactor. The spring mass element may be provided by adding a mass portion to the side wall of the reactor case or by forming a spring portion and a mass portion by cutting.

  In the vehicle body fixing structure for a vibration generator according to the present invention, a vibration generator mounting portion to which a mounting member for fixing the vibration generator to the vehicle body is coupled, a mounting member, and a side wall of a case housing the vibration generator Since a dynamic damper function is provided by integrally forming at least one of the spring mass elements as a part of the spring mass element, the spring mass element does not increase in number and can be easily assembled. Vibration transmission from the vibration generator to the vehicle body can be suppressed by the dynamic damper function of the element.

It is a side view which shows the vehicle body fixing structure of the vibration generation body which is 1st Embodiment. FIG. 2 is a plan view of a vehicle body fixing structure of a vibration generator viewed from above in FIG. 1. It is an enlarged view which shows the spring mass element in FIG. (A) is a figure which shows the mode of the vibration attenuation | damping by this embodiment, (B) is a figure which shows the mode of the conventional vibration transmission. It is a graph which shows the experimental data showing the vibration suppression effect by 1st Embodiment. It is a figure which shows the modification of 1st Embodiment. It is a figure which shows another modification of 1st Embodiment. It is sectional drawing which shows the vehicle body fixing structure of the vibration generation body of 2nd Embodiment. It is a top view of the vehicle body fixing structure of the vibration generating body seen from the upper side in FIG. It is a perspective view of the bracket which is an attachment member in a 2nd embodiment. It is a figure which shows the deformation | transformation mode at the time of the vibration transmission in 2nd Embodiment. It is a fragmentary sectional view which shows the vehicle body fixing structure of the vibration generation body of 3rd Embodiment. It is a figure which shows the spring mass element of 3rd Embodiment, (A) shows the example which provided the spring mass element in the case side surface by addition of a mass part, (B) is a spring by forming a notch in a case side surface. The example which provided the mass element is shown.

  Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. In this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating the understanding of the present invention, and can be appropriately changed according to the application, purpose, specification, and the like.

(First embodiment)
FIG. 1 is a side view of a vehicle body fixing structure (hereinafter, simply referred to as a vehicle body fixing structure) 10 according to the first embodiment, and FIG. 2 is a top view of the vehicle body fixing structure 10 in FIG. It is a top view. The vehicle body fixing structure 10 of the present embodiment is a structure for fixing a PCU case 12 containing a power control device (also referred to as a PCU (Power Control Unit)) such as a reactor to a vehicle body (not shown). In this embodiment, the PCU case 12 corresponds to a vibration generator.

  In the vehicle body fixing structure 10, the PCU case 12 is fixed directly to the vehicle body 1 via the mounting member 14 or indirectly via other members (not shown) (for example, a PCU tray). In FIG. 1, one lower corner of the PCU case 12 is shown in a side view.

  The PCU case 12 is constituted by a housing made of a metal material suitable for absorbing high frequency noise generated from an internal power control device so as not to leak, for example, aluminum or an aluminum alloy. The PCU case 12 has a side wall surface 13a and a bottom surface 13b. On the side wall surface 13 a of the PCU case 12, a mounting portion 16 protrudes laterally from the PCU case 12 and is integrally provided. A plurality of mounting portions 16 are provided around the PCU case 12, but only one is illustrated in an enlarged manner in FIG. 1.

  A screw insertion hole 18 is formed in the attachment portion 16 so as to penetrate in the vertical direction or the thickness direction. The attachment portion 16 is a fastening portion that is fastened to the upper end surface of the attachment member 14 by a bolt 19 that is inserted into the screw insertion hole. A spring mass element 20 is integrally formed as a part of the attachment portion 16 at the distal end portion 17 in the protruding direction of the attachment portion 16. More specifically, a notch 22 is formed in the lateral direction at the distal end portion 17 located farther than the screw insertion hole 18 with respect to the side wall surface 13 a of the PCU case 12. The notch 22 is formed so as to partition the spring mass element 20. Specifically, the width of the notch 22 in the vertical direction is formed such that the front side is narrow and the back side is wide as viewed from the front end side of the mounting portion 16. As a result, a spring portion 20a having a small width or thickness and a mass portion (or mass portion) 20b having a large width or thickness are formed at the distal end portion 17 of the attachment portion 16, and these spring portion 20a and mass portion 20b are formed. Thus, the spring mass element 20 is configured. Here, referring to FIG. 3, each spring mass element 20 is represented by a spring portion 20a having a spring constant k and a mass portion 20b having a mass m.

  Referring to FIG. 1 again, in the vehicle body fixing structure 10 of the present embodiment, the three spring mass elements 20 are formed in parallel because the three cuts 22 are formed side by side in the vertical direction. However, the number of the spring mass elements 20 is not limited to this, and may be one, two, or four or more. Further, the dimensions, shape, size, and the like of the spring portion 20a and the mass portion 20b of the spring mass element 20 are set to resonance frequencies that can satisfactorily attenuate high-frequency vibration generated in the PCU case 12 when they function as a dynamic damper. Can be designed.

  The attachment member 14 is a member for fixing the PCU case 12 to the vehicle body 1. The attachment member 14 includes an upper end portion 24 that is connected to the lower surface of the attachment portion 16 of the PCU case 12, an extension portion 26 that is bent from the upper end portion 24 and extends in the longitudinal direction, and extends from the extension portion 26 in the lateral direction. And a bent lower end 28. Screw insertion holes 24 a and 28 a are formed in the upper end portion 24 and the lower end portion 28 of the attachment member 14, respectively. Moreover, the attachment member 14 is suitably formed by bending a strip-shaped metal plate, for example.

  The upper end 24 of the mounting member 14 has a flat upper surface, but is formed so as not to contact the bottom surface 13 b of the PCU case 12. Alternatively, the attachment member 14 may be configured as shown by a dashed line in FIG. 1 to ensure that the upper end 24 of the attachment member 14 contacts only the lower surface of the attachment portion 16 and is not in contact with the bottom surface 13b. You may form so that it may continue to the lower end part 28 by the extending | stretching part inclined diagonally.

  The bolt 19 inserted into the screw insertion hole 18 formed in the attachment portion 16 is inserted into the screw insertion hole 24 a of the upper end portion 24 of the attachment member 14. Then, the nut 30 is screwed onto the tip of the bolt 19 protruding below the upper end 24 of the mounting member 14 and tightened. As a result, the attachment member 14 is fastened to the attachment portion 16 of the PCU case 12.

  On the other hand, the lower end portion 28 of the attachment member 14 is fastened to the vehicle body 1 (or another member such as a PCU tray to be fixed to the vehicle body 1) by a bolt 29 inserted through the screw insertion hole 28a. As a result, the PCU case 12 is fixed to the vehicle body 1 via the attachment member 14.

  Next, the operation of the vehicle body fixing structure 10 having the above configuration will be described. FIG. 4A is a diagram showing a state of vibration attenuation according to the present embodiment, and FIG. 4B is a diagram showing a state of conventional vibration transmission.

  As shown in FIG. 4B, in the conventional vehicle body fixing structure of the PCU case 12, a vibration transmission path 32 connected from the PCU case 12 to the vehicle body 1 via the mounting portion 16 and the mounting member 14 is formed. For this reason, high-frequency vibration generated by a reactor or the like included in the PCU is transmitted from the PCU case 12 to the vehicle body 1 and may be heard as unpleasant noise for passengers in the vehicle.

  On the other hand, according to the vehicle body fixing structure 10 of the present embodiment, as shown in FIG. 4A, the spring mass element 20 is formed integrally with the mounting portion 16 and exhibits a dynamic damper function. Thereby, the vibration transmitted from the PCU case 12 to the mounting portion 16 is damped by vibrating each spring mass element 20 in the direction of the arrow 34 so as to have an opposite phase to the transmitted vibration. For this reason, the vibration transmitted to the vehicle body 1 via the vibration transmission path 32 can be reduced, and as a result, the comfort of the passenger compartment space can be improved.

  Further, according to the vehicle body fixing structure 10 of the present embodiment, since the spring mass element 20 is formed integrally with the mounting portion 16 of the PCU case 12, a dynamic damper function can be obtained without increasing the number of parts. . Therefore, the assembling is the same as in the prior art, and no special effort is required. Furthermore, since the vibration transmission path length is not long and the vibration is not attenuated, the structure can be made compact.

  FIG. 5 is a graph showing an example of experimental data representing the vibration damping effect of the vehicle body fixing structure 10. The lower graph in FIG. 5 shows the frequency of vibration generated in the PCU case 12 on the horizontal axis and the inertance in the mounting portion 16 on the vertical axis. Here, inertance represents that the vibration is attenuated as the numerical value is smaller. Further, the upper graph in FIG. 5 shows the vibration phase with respect to the vibration frequency, and represents that the resonance point is when it crosses 90 degrees. In each graph, a solid line indicates a case where there is no dynamic damper function (that is, FIG. 4B), and a broken line indicates a case where the dynamic damper function according to the present embodiment is provided.

  Referring to the lower graph of FIG. 5, it can be seen that there is a vibration damping effect in a wide frequency range where the frequency exceeds about 2 kHz to 10 kHz, and in particular, the vibration damping effect around 9.5 Hz is large. This is because the spring mass element 20 is designed so as to effectively suppress the high-frequency vibration corresponding to the switching frequency 9.5 kHz of the switching element (for example, IGBT) included in the PCU. Therefore, by designing the spring constant k of the spring portion 20a of the spring mass element 20 and the mass m of the mass portion 20b according to a desired frequency, a great damping effect on the targeted high frequency band vibration can be obtained.

  In the above embodiment, the notches 22 for partitioning the spring mass elements 20 are formed by extending in the lateral direction of the mounting portion 16, but the present invention is not limited to this, and there may be various forms. For example, as shown in FIG. 6, the spring portion 20a and the mass portion 20b may be partitioned by forming a notch 22 having a predetermined depth from the upper surface of the mounting portion 16, or as shown in FIG. In addition, the spring portion 20a and the mass portion 20b may be partitioned by at least one notch 22 penetrating the distal end portion 17 of the attachment portion 16 in the vertical direction. Further, the mass may be adjusted by attaching a metal lump to the mass portion 20b of the spring mass element 20 by welding or the like.

(Second Embodiment)
Next, the vehicle body fixing structure 40 of the second embodiment will be described with reference to FIGS. FIG. 8 is a cross-sectional view showing the vehicle body fixing structure 40 of the second embodiment, FIG. 9 is a plan view of the vehicle body fixing structure when viewed from above in FIG. 8, and FIG. 10 is an attachment member. 4 is an overall perspective view of a bracket 42. FIG.

  In the vehicle body fixing structure 40 of the present embodiment, the PCU case 12 is fixed directly or indirectly to the vehicle body 1 via the bracket 42. In this embodiment, only the screw insertion hole 18 for inserting the screw 44 is formed in the mounting portion 16 of the PCU case 12, and the spring mass element 20 is integrally provided in the bracket 42. .

  The bracket 42 is formed by bending a metal plate material, for example. The bracket 42 includes an upper end fastening portion 46 to which the mounting portion 16 of the PCU case 12 is fastened by a screw 44, two leg portions 48 that are bent and extended at substantially right angles from both ends of the upper end fastening portion 46, and a leg portion 48. And a lower end fastening portion 50 formed by being bent at a substantially right angle. Screw insertion holes 47 and 51 are formed in the upper end fastening portion 46 and the two lower end fastening portions 50, respectively.

  The upper end fastening portion 46 of the bracket 42 has a flat surface that contacts the lower surface of the attachment portion 16, but has an extension portion 52 that extends more than necessary for fastening the attachment portion 16. The extension 52 extends in a direction away from the side surface 13 a of the PCU case 12. And the front-end | tip of this extension part 52 is bent to the upper side at substantially right angle with respect to the extension direction.

  In addition, in the extended portion 52 of the upper end fastening portion 46 of the bracket 42, cuts 22 are formed at both side edges along the extending direction. A portion whose width is narrowed by the notches 22 forms a spring portion 20 a of the spring mass element 20, and a distal end of the extension portion 52 defined by the notches 22 forms a mass portion 20 b. By forming a portion bent upward in the mass portion 20b, the lateral dimension can be suppressed while securing the mass of the mass portion 20b.

  In the vehicle body fixing structure 40 of the present embodiment, the screw 44 is inserted through the washer 54 into the screw insertion hole 18 of the mounting portion 16 and the screw insertion hole 47 of the bracket 42, and the screw tip protruding below the upper end fastening portion 46. The nut 56 is screwed and tightened. Thereby, the bracket 42 is fastened to the PCU case 12. When the lower end fastening portion 50 of the bracket 42 is fastened to the PCU tray with the screw 45, the PCU case 12 is fixed to the vehicle body 1 via the bracket 42 and the PCU tray. Since other configurations are the same as those of the first embodiment, the same or similar elements are denoted by the same or similar reference numerals, and description thereof is omitted.

  Also with the vehicle body fixing structure 40 of the second embodiment configured as described above, the same operational effects as those of the first embodiment can be obtained. That is, the spring mass element 20 is formed integrally with the bracket 42 and exhibits a dynamic damper function. As a result, the vibration transmitted from the PCU case 12 to the mounting portion 16 is damped by vibrating each spring mass element 20 in the direction of the arrow 34 so that each spring mass element 20 has an opposite phase to the transmitted vibration, as shown in FIG. To do. For this reason, the vibration transmitted to the vehicle body 1 via the vibration transmission path 32 can be reduced, and as a result, the comfort of the passenger compartment space can be improved.

  Moreover, the point which can be assembled easily and can make a structure compact without increasing the number of parts is the same as that of the said 1st Embodiment.

  In the present embodiment, the spring mass element 20 is provided only on the bracket 42, but the spring mass element 20 may also be provided on the mounting portion 16 of the PCU case as in the first embodiment. Thereby, a greater vibration damping effect can be obtained. Further, the mass may be adjusted by attaching a metal lump to the mass portion 20b of the spring mass element 20 by welding or the like.

(Third embodiment)
Next, the vehicle body fixing structure 60 of the third embodiment will be described. FIG. 12 is a partial cross-sectional view showing a vehicle body fixing structure 60 of the third embodiment. Moreover, FIG. 13 is a figure which shows the spring mass element 20 of 3rd Embodiment, (A) shows the example which provided the spring mass element in the case side surface by addition of the mass part, (B) is the case side surface. The example which provided the spring mass element by forming a notch is shown.

  The vehicle body fixing structure 60 of the present embodiment is a structure for fixing a reactor 62 as a vibration generator to the vehicle body 1 after being accommodated in a reactor case 68. In the vehicle body fixing structure 60 of the present embodiment, the spring mass element 20 is integrally provided on the side wall 68 a of the reactor case 68.

  The reactor 62 includes an annular reactor core 64 formed of a magnetic material and a coil 66 wound around a gap portion formed in the reactor core 64. One end 72 of a reactor stay (attachment member) 70 formed by bending a metal plate is connected and fixed to the end of the reactor core 64 by bonding or the like. The other end of the reactor stay 70 is fastened and fixed to the bottom of the reactor case 68 with a screw 76. Further, between the reactor 62 and the bottom of the reactor case 68 is filled with a resin 77 for improving the heat dissipation of the reactor 62.

  As shown in FIG. 13, the reactor case 68 is integrally provided with the spring mass element 20. As shown in FIG. 13 (A), the spring mass element 20 has a mass portion 20b formed on the outer surface of the side wall 68a of the reactor case 68 by welding or the like to form a mass portion 20b. May be used as is as the spring portion 20a, or, as shown in FIG. 13B, a notch 22 may be provided on the surface of the side wall 68a to partition the spring portion 20a and the mass portion 20b. .

  In the vehicle body fixing structure 60 of the third embodiment configured as described above, high-frequency vibration generated in the reactor 62 is transmitted to the reactor case 68 via the reactor stay 70. At this time, since the spring mass element 20 is integrally provided on the side wall 68a of the reactor case 68, the dynamic damper function can be exhibited and the transmitted high-frequency vibration can be attenuated.

  The reactor case 68 that houses the reactor 62 may be housed together with another power converter such as an inverter in the PCU case and fixed to the vehicle body 1 in some cases. In this case, at least one of the first embodiment and the second embodiment may be applied as a structure for fixing the PCU case to the vehicle body. By doing so, in addition to the vibration damping effect by the reactor case 68, the vibration damping effect by the mounting portion and the bracket of the PCU case can be obtained.

  DESCRIPTION OF SYMBOLS 1 Car body 10, 40, 60 Car body fixing structure, 12 PCU case, 13a Side surface, 13b Bottom surface, 14 Mounting member, 16 Mounting part, 17 Tip part, 18, 24a, 28a, 47, 51 Screw insertion hole, 19, 29 Bolt, 20 spring mass element, 20a spring portion, 20b mass portion, 24 upper end portion or one end portion, 26 extension portion, 28 lower end portion or other end portion, 30, 56 nut, 32 vibration transmission path, 42 bracket, 46 upper end fastening Part, 48 leg part, 50 lower end fastening part, 52 extension part, 54 washer, 62 reactor, 64 reactor core, 66 coil, 68 reactor case, 68a side wall, 70 reactor stay, 72 one end part, 77 resin, 78 metal lump.

Claims (8)

A fixing structure for fixing a vibration generator that generates high-frequency vibrations to a vehicle body via an attachment member,
The mounting member has one end connected to the vibration generator and the other end connected to the vehicle body or a case fixed to the vehicle body,
A dynamic mass function is provided by integrally forming a spring mass element as a part of at least one of the attachment portion of the vibration generator, the attachment member, and the side wall of the case to which the attachment member is connected. The body fixing structure of the vibration generator. In the vehicle body fixing structure of the vibration generator according to claim 1,
The attachment portion of the attachment member is a fastening portion that protrudes from a side surface of the vibration generator and has a screw insertion hole, and the spring mass element is positioned away from the screw insertion hole with respect to the side surface. A vehicle body fixing structure for a vibration generator, characterized in that it is provided by forming a notch at the tip of the fastening portion. The vehicle body fixing structure for a vibration generator according to claim 2,
The incision with respect to the fastening portion is formed so as to partition a spring portion having a small width or thickness and a mass portion having a large width or thickness. In the vehicle body fixing structure of the vibration generator according to claim 2 or 3,
A vehicle body fixing structure for a vibration generator, wherein a plurality of notches are formed at a distal end portion of the fastening portion to form a plurality of spring mass elements. In the vehicle body fixing structure of the vibration generator according to claim 1,
The mounting member is a bracket formed by bending a metal plate, and the bracket is bent at both ends from the upper end fastening portion to which the mounting portion of the vibration generator is fastened by a screw. Two extending leg portions, and a lower end fastening portion that is bent from the leg portion and fastened to a fixed object fixed to the vehicle body by a screw, and the upper end fastening portion of the bracket is used to fasten the mounting portion. A structure for fixing a vehicle body of a vibration generator, characterized in that the spring mass element is formed by forming an extension part extending more than necessary, and forming a cut in the extension part. In the vehicle body fixing structure of the vibration generator according to claim 5,
A vehicle body fixing structure for a vibration generator, wherein a tip of the extension portion is bent with respect to the extension direction. In the vehicle body fixing structure of the vibration generator according to any one of claims 1 to 5,
The structure for fixing a vehicle body of a vibration generator, wherein the vibration generator is a case for a power control device that houses a power control device including a reactor. In the vehicle body fixing structure of the vibration generator according to claim 1,
The vibration generator is a reactor, and the mounting member is a fixing member for fixing the reactor to a reactor case made of a metal casing that houses the reactor, and a mass portion is added to a side wall of the reactor case. Alternatively, the spring mass element is provided by forming a spring portion and a mass portion by cutting.

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