JP2007297980A - Metal layered cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration damping cover device capable of improving vibration control performance and heat shielding performance, reducing weight and cost. <P>SOLUTION: In this cover 1 made of aluminum formed in a three-dimensional shape according to the shape of a cell starter 68 generating heat and vibration, two or more metal sheets 4, 4a corrugated along two or more directions mutually intersecting over the whole surface are mutually laminated across a space 40, the metal sheets 4, 4a are so formed that an airflow inside the space 40 is turned into an airflow which is slower than an airflow on the further outer side from the metal sheet 4 on the outer side from the space 40 and substantially stagnant, many clearances formed by corrugating work are formed over the whole surface of the metal sheets 4, 4a, and the metal sheets 4, 4a are mutually fixed by being brought into point-contact with each other in a connection part 42 discretely set to a periphery part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to, for example, a metallic laminated cover that covers a heat source that generates heat and vibration, such as an exhaust pipe of an internal combustion engine, and realizes a vibration damping action and a heat shielding action against the heat source.

  An example of a heat source that generates such heat and vibration is an internal combustion engine (hereinafter referred to as an engine). Heat, noise, vibration, etc. are dissipated to the outside from the exhaust system such as the engine body and an exhaust manifold (hereinafter abbreviated as “exhaust manifold”) connected to the engine. Conventionally, various covers such as a heat insulator have been used for the heat source in order to prevent a situation in which heat and vibration are dissipated from the heat source such as the engine main body and the exhaust system.

FIG. 16 is a longitudinal sectional view of a silencer 51 which is a prior art disclosed in Patent Document 1 below. Hereinafter, the prior art will be described with reference to FIG. In this prior art, an aqueous dispersion of calcined vermiculite is applied to the entire surface of a mat-like base material layer 52 made of silica alumina fibers having an average fiber diameter of 2.5 μm as a solid content weight using a brush. It is applied to 100 g / m ² and then dried with hot air at 150 ° C. for about 1 hour to form a vermiculite coating layer 53, thereby producing soundproof and heat insulating material portions 52 and 53.

  The aqueous dispersion of the calcined vermiculite was obtained by calcining a commercially available vermiculite (No. 0, manufactured by Nichias Co., Ltd.) at 800 ° C. for 1 hour to remove crystal water, and then adding 150 g thereof to 1 liter of distilled water. After adding 1 g of ammonium sulfate and 5 g of methyl cellulose, the mixture is uniformly stirred to obtain a solid content of about 13% by weight.

  The soundproofing and heat insulating material portions 52 and 53 are in contact with the outer surface of the through pipe 56 having a number of pores 55 on the wall surface of the silencer 51 so that the vermiculite coating layer 53 side of the soundproofing heat insulating material portions 52 and 53 comes into contact with the outer surface. After being wound around, a substantially cylindrical outer shell 57 is attached to the outside to sandwich the soundproof and heat insulating portions 52 and 53.

  In the above Patent Document 1, as a result of the actual machine endurance test of the silencer 51 including the soundproofing and heat insulating material portions 52 and 53, the silencer 51 has no deterioration in sound absorption performance due to use. The vermiculite coating layer 53 is partially thinned, but it is described that the fibers of the mat-like base material layer 52 are not scattered or dropped. In addition, as a comparative example, when an actual machine durability test was performed on a silencer using only the E-glass fiber mat-like base material layer 52 in which the vermiculite coating layer 53 was not provided in the soundproof and heat insulating material portions 52 and 53. Describes the phenomenon that the fiber of the mat-like base material layer 52 is scattered by about 45% and the weight is reduced.

In addition to the conventional technique using an inorganic fiber layer such as the mat-like base material layer 52 shown in Patent Document 1, the conventional technology relating to a metal cover as shown in Patent Document 2 and Patent Document 3 below. Technology is also known. In these prior arts shown in Patent Document 2 and Patent Document 3, a metal cover is formed by laminating metal sheets, and the sound absorbing property, damping property, and heat insulating property are considered.
JP 2003-266572 A (paragraphs 47 to 50 and FIG. 3) JP 2001-347323 A JP 2002-113525 A

  In the prior art which tries to suppress the diffusion of noise from a sound source such as the silencer, as described above, a technique using a mat-like base material layer made of inorganic fibers such as silica alumina fibers and E-glass fibers is often used. It has been. However, in such a conventional technique, as described above, scattering and dropping off due to pulverization of the inorganic fibers used are inevitable. For this reason, as shown in the above-mentioned Patent Document 1, some kind of material such as a vermiculite coating layer 3 for holding a mat-like base material layer made of inorganic fibers and preventing the inorganic fibers from scattering and falling off. A coating layer is required.

  As in the prior art described above, in the prior art using a mat-like base material layer and a coating layer, the coating layer is adhered to the mat-like base material layer, for example. Therefore, when heat and vibration are generated from the heat source as in the silencer in the above prior art, the heat is immediately transmitted to the mat-like base material layer through the coating layer, and the inorganic fibers constituting the mat-like base material layer. The thermal fatigue and thermal destruction of the steel are promoted, the heat shielding performance and the vibration damping performance are lowered, and the durability concerning the quality is lowered.

  Further, in the above-described prior art, a corresponding manufacturing process is required for the formation of the above-described coating layer or mutual fixation between the coating layer and the mat-like base material layer. When manufacturing the covers for realizing the action and the vibration damping action, there is a problem that the number of man-hours increases and the number of parts constituting the covers increases.

  Moreover, in the metal cover of the prior art shown by the said patent document 2 and the patent document 3, it is arrange | positioned on the outer side on the opposite side to a heat source with respect to an inner metal sheet arrange | positioned inside facing a heat source, and an inner metal sheet. The outer metal sheet is in close contact with each other over the entire surface. Thereby, the heat, noise, vibration, etc. that have reached the inner metal sheet from the heat source are easily transmitted to the outer metal sheet, and the heat, noise, vibration, etc. from the heat source are transmitted through the two-layer metal sheet of the metal cover, There is a problem that the metal cover is diffused to the outside and the quality of the metal cover is reduced in terms of heat insulation, sound insulation, nine sound, and vibration control.

  The present invention has been made to solve the above problems, and its purpose is to improve the heat insulation performance, the sound insulation performance, the sound absorption performance and the vibration damping performance, and improve the durability of the product. It is to provide a laminated cover.

  The metal laminated cover according to the first aspect of the invention corresponds to either the shape of a heat source that generates heat and vibration or the shape of a protection target that should be protected against heat and vibration from the heat source. This is a metal laminated cover composed of a high brightness and glossy metal material formed into a three-dimensional shape, made of metal material, and corrugated along multiple directions intersecting each other over the entire surface. A plurality of applied metal sheets are stacked with a space between each other, and each metal sheet is formed with a large number of gaps formed by corrugation over the entire surface, and each metal sheet is discrete on the outer periphery. It is characterized in that it is fixed to each other by point contact at the joint site set to.

  In the invention of claim 1, the plurality of metal sheets constituting the metal laminated cover are formed with the plurality of gaps over the entire surface, and the metal sheets are spaced from each other. Furthermore, they are fixed to each other by point contact at discrete joint points set on the outer periphery.

  Therefore, when the metal laminated cover of the present invention has a flow in the heat source, the metal laminated cover, and the air in the vicinity of the object to be protected, a flow also occurs in the air layer in the space. The laminated cover is efficiently cooled and efficiently performs a heat shielding action on the heat source. Furthermore, when the flow of air in the vicinity of the heat source, the metal laminated cover, and the protection target is stopped, the flow of the air layer in the space is substantially stagnated. Even in such a case, the metal laminated cover of the present invention can realize a good heat shielding action by the air layer in the space.

  Therefore, according to the present invention, the heat shielding performance of the metal laminated cover is significantly improved. Moreover, in the metal laminated cover of the present invention, the necessity of using a special heat shield member is eliminated, and the heat shield performance can be improved with a simple configuration.

  Further, the metal laminated cover of the present invention holds a triple air layer of an air layer composed of the numerous gaps for each metal sheet and an air layer in a space between the metal sheets. become. This triple air layer realizes the action of the insulating layer with respect to heat, noise and vibration generated from the heat source. Thereby, the degree to which the heat, noise and vibration generated from the heat source are dissipated to the protection target side through the metal laminated cover is remarkably suppressed by the presence of the triple air layer. Therefore, the heat insulation performance, the sound insulation performance, the sound absorption performance, the vibration damping performance, and the durability related to these performances of the metal laminated cover can be significantly improved.

  Further, in the present invention, since a mat-like base material layer is not required, a coating layer for compensating for a decrease in heat insulation performance and vibration control performance due to thermal fatigue and thermal breakdown associated with the use of the base material layer. Is also unnecessary. Thereby, the manufacturing man-hour and the number of parts of the metal laminated cover are significantly reduced.

  In addition, since the plurality of metal sheets constituting the metal laminated cover are fixed to each other by point contact at the joint portions discretely set on the outer peripheral portion, the metal sheet facing the heat source is protected from the protection target side. The transmission of heat, noise and vibration to the metal sheet is greatly suppressed. This also greatly suppresses the degree to which heat, noise and vibration generated from the heat source are dissipated to the protection target side through the metal multilayer cover, and the heat insulation performance and sound insulation performance of the metal multilayer cover. In addition, sound absorption performance, vibration control performance, and durability related to these performances are significantly improved.

  A metal laminated cover according to a second aspect of the present invention is the metal laminated cover according to the first aspect, wherein each of the metal sheets is formed by laminating a plurality of metal plates made of metal, and a plurality of the laminated metal plates. In addition, a wave shape in which valleys and ridges are alternately repeated is formed continuously along the first direction, and valleys and ridges are alternately formed along a second direction intersecting the first direction. It is characterized in that other repeated waveform shapes are formed continuously.

  In the present invention, each metal sheet is configured by laminating a plurality of metal plates. Moreover, the corrugated shape formed in each metal sheet is a corrugated shape. Therefore, in this invention, the effect similar to the effect demonstrated in Claim 1 is implement | achieved. Furthermore, in the present invention, since each metal sheet is composed of a plurality of metal plates, the thickness of each metal sheet is increased, and an air layer composed of the plurality of gaps is provided for each metal sheet. It becomes two layers. Thereby, the heat insulation performance, the sound insulation performance, the sound absorption performance, the vibration damping performance, and the durability related to these performances of the metal laminated cover are further improved.

  According to a third aspect of the present invention, there is provided the metal laminated cover according to the first aspect, wherein the plurality of metal sheets are selected to have different plate thicknesses.

  In the present invention, metal sheets having different plate thicknesses are fixed to each other with a space between each other, and the fixing is realized by point contact at discretely set joint portions on the outer peripheral portion. . Thereby, each metal sheet vibrates substantially individually. Due to the vibration of the metal sheet, part of the vibration energy transmitted from the heat source to the metal sheet is converted into the vibration energy of the metal sheet, reducing the vibration and noise dissipated from the metal laminated cover to the protection target side. can do.

  In the present invention, when the metal sheets vibrate due to vibration from the heat source, the resonance frequency bands of the metal sheets differ from each other due to the difference in thickness of the metal sheets. Therefore, with the metal laminated cover of the present invention, vibrations in a wide frequency band and noise diffusion to the outside can be suppressed, and sound insulation performance, sound absorption performance, and vibration control performance are improved.

  According to a fourth aspect of the present invention, in the metal laminated cover according to any one of the first to third aspects, the metal sheet facing the heat source among the plurality of metal sheets includes at least another metal sheet and the A plurality of through holes are formed over a range separating the spaces.

  When the metal laminated cover according to the present invention has such a configuration, it is possible to realize a sound absorbing action based on the principle of Helmholtz resonance. By appropriately selecting the plate thickness, aperture ratio, hole diameter, and the like of the metal sheet corresponding to the frequency band of vibration and noise to be absorbed, it is possible to realize a sound absorbing action regarding a desired frequency band.

  Therefore, in the present invention, in addition to the operational effects described with respect to any one of the first to third aspects, the sound insulation performance, sound absorption performance, and vibration control performance of the metal laminated cover are further improved.

  Since the metal laminated cover of the present invention is composed of a plurality of metal sheets, it is necessary to have a member made of inorganic fibers or the like that can easily be fatigued or broken over time as it is used. Since it is eliminated, the durability is remarkably improved, and the number of manufacturing steps and the number of parts are remarkably reduced. Furthermore, the metal laminated cover includes a space between the plurality of metal sheets, and the metal laminated cover of the present invention has a triple air layer including the space, Since multiple metal sheets are point-contacted and fixed to each other at joints that are discretely set on the outer periphery, heat insulation performance, sound insulation performance, sound absorption performance, vibration control performance, and durability related to these performances There is an advantage that the sex is remarkably improved.

  The metal laminated cover is attached to a heat source that generates heat and vibration, and has an extremely simple structure with the objective of improving heat insulation performance, sound insulation performance, sound absorption performance and vibration control performance, and improving product durability. Realized.

(Embodiment 1)
Hereinafter, a starter cover (hereinafter referred to as a cover) 1 according to an embodiment of the metal laminated cover of the present invention will be described with reference to FIGS. First, the outline of the configuration of the cover 1 will be described with reference to FIGS. FIG. 1 is a front view of a cover 1 of an embodiment of a metal laminated cover according to the present invention, FIG. 2 is a front view of an engine 61 with the cover 1 attached, and FIG. 3 is a left side view of the engine 61. 4 is a front view showing the coining range of the cover 1, FIG. 5 is a cross-sectional view taken along the section line X5-X5 in FIG. 1, and FIG. 6 is a section from the section line X6-X6 in FIG. FIG. 7 is a cross-sectional view as seen from the section line X7-X7 in FIG. 1, and FIG. 8 is an enlarged cross-sectional view near the portion X8 in FIG.

  The engine 61 of the present embodiment is arranged by tilting the cylinder 63 obliquely upward from the crankcase 62, and the fuel tank 64 and the muffler 65 are arranged above the engine 61. A fan case 67 containing a cooling fan is installed on the rear side of the engine 61 in FIG. 2 and on the left side of FIG. 3, and an air cleaner 69 is arranged on the right side of FIG. A fuel tank 64 is disposed so as to straddle the space above the crankcase 62 and part of the upper side surface of the cylinder 63.

  A cell starter 68 having a substantially cylindrical appearance is arranged on the left side surface 66 of the crankcase 62 so as to extend in the left-right direction in FIG. A starter switch 70 and a magnet switch 71 are arranged on the left side of the engine 61 in FIG. The magnet switch 71 is configured by arranging a cylindrical body in the left-right direction of the engine 61 in FIG. 2 and 3 below the fuel tank 64 is provided with a switch cover 73 that covers at least the starter switch 70 and the like. The cover 1 of this embodiment shown by a two-dot chain line in FIG. 2 is attached to the cell starter 68.

  As shown in FIG. 2, the cover 1 is formed in a three-dimensional shape covering the substantially cylindrical cell starter 68, and the upper end of the cover 1 in FIGS. 2 and 3 is disposed below the fuel tank 64 and the magnet switch 71. Has been. Furthermore, in the engine 61 of this embodiment, the heat source HS may be disposed on the opposite side of the cover 1 from the cell starter 68. The heat source is a crankcase 62 or a cylinder 63 when the engine 61 is arranged in parallel in the left-right direction in FIG. 2, or an exhaust pipe such as an exhaust manifold of the engine 61 depending on the arrangement of the exhaust system of the engine 61. In such a case, heat or vibration from the heat source HS may adversely affect the cell starter 68 in terms of thermal vibration.

  Hereinafter, the shape and structure of the cover 1 will be described with reference to FIGS. The cover 1 is disposed between the heat source HS that generates heat and vibration and the cell starter 68 that is the protection target, and is formed into a three-dimensional shape corresponding to the shape of the cell starter 68 that is the protection target. The cover 1 is configured as described below from a pair of thin plate members 4 and 4a which are metal sheets formed from aluminum or an aluminum alloy as an example of a metal material having high brightness and gloss.

  Each thin plate member 4, 4 a is subjected to corrugation along a plurality of directions intersecting each other over the entire surface, and is laminated with a space 40 therebetween. The thin plate members 4, 4 a are configured so that the air flow inside the space 40 has a slower flow velocity than the air flow outside the metal sheet 4 outside the space 40 and is substantially stagnant. The

  Specifically, as described above, the cover 1 is formed in a substantially semi-cylindrical outer shape covering the outer side of the cell starter 68 having a substantially cylindrical shape shown in FIG. As shown, the thin plate material 4 a is formed smaller than the thin plate material 4. That is, the thin plate material 4a is covered with the thin plate material 4a. In addition, the cover 1 has a curved shape corresponding to the shape of the cell starter 68 as a whole, and an opening 41 with the space 40 facing outward is located on the cell starter 6 side with respect to the curved shape.

  Further, the cover 1 has a size of about 10 cm × 10 cm in a plan view shown in FIG. 1, whereas the distance between the thin plate members 4 and 4a constituting the space 40 is set to about 5 mm, and an air layer is formed inside. Is included. Here, when a device that is equipped with the engine 61 moves and a flow occurs in the air in the vicinity of the heat source HS, the cover 1, and the cell starter 68, a flow also occurs in the air layer in the space 40. Thus, the cover 1 is efficiently cooled and efficiently performs a heat shielding action on the heat source HS. On the other hand, when the air flow in the vicinity of the heat source HS, the cover 1 and the cell starter 68 is stopped, the flow of the air layer in the space 40 is substantially stagnated. Even in such a case, the cover 1 of the present embodiment can realize a good heat shielding action by the air layer in the space 40 as described later.

  Here, when the air flow near the cover 1 substantially stays as described above, the air layer in the space 40 also stagnates. It is clear from each data of Table 1 in FIG. 17 and Table 2 in FIG. 18 that such a staying air layer has a good heat shielding property with respect to heat.

  Table 1 in FIG. 17 shows a fixed physical quantity called thermal conductivity of each material, and Table 2 in FIG. 18 shows the thicknesses of various commercially available materials arranged in descending order of heat transfer resistance. . From Table 1, it can be seen that the heat insulation of air is the best than other materials. Furthermore, it can be seen from Table 2 that the material having good heat insulation is a material having a space confined inside. In addition, it can be seen that the heat insulation performance is higher as the air layer is held in the inside as much as possible with respect to the thickness. According to the experiments of the present inventors, it has been confirmed that the cover 1 of the present embodiment has a higher heat shielding property than the cover of the prior art in which two layers of aluminized steel plates are sandwiched and a felt-like heat insulating material is sandwiched therebetween. . Further, the metal sheets 4 and 4a are point-contacted at joint portions 42 discretely set on the outer peripheral portion, and are fixed to each other by, for example, spot welding.

  In FIG. 4, the range indicated by hatching is a range where a coining process for fully bending the thin plate members 4, 4 a that are corrugated and formed with unevenness on the entire surface is performed. In this embodiment, in the corrugated metal plates 4 and 4a, such as the flange part of the cover 1, the part to be punched, the part to be stamped, the part that needs to be folded, punched, stamped, etc. In order to perform these processes easily and simply, the corrugated shape is crushed by a pressing process or the like on the part, and is formed into a substantially flat plate shape.

  Therefore, when performing post-processing such as bending processing for flange formation, piercing processing for drilling, or stamping processing, such as the above-mentioned flanges and drilling sites, the processing target site should be handled in the same manner as a flat metal plate. And processability and handleability are significantly improved.

  Hereinafter, the shock absorber used when connecting the cover 1 to the cell starter 68 will be described with reference to FIG. In the shock absorber 81 of the present embodiment, a collar member 82 that surrounds the bolt 83 and is formed of a steel plate such as galvanized is provided. The collar member 82 includes a cylindrical portion 87 and flange portions 88 that are integrally formed on both ends of the cylindrical portion 87 in the axial direction.

  Surrounding the cylindrical portion 87 of the collar member 82, a substantially annular cushioning material 84, which is made of, for example, a stainless steel expanded metal and has a zinc film formed by a dacrotized (trade name) treatment on the surface, for example, is disposed. Is done. In addition to the expanded metal, the buffer material 84 may be formed from a flat plate material such as a punching metal or a stainless steel thin plate having slits of various shapes. The buffer material 84 has an insertion hole having an inner diameter larger than the outer diameter of the cylindrical portion 87 of the collar member 82.

  Between the buffer material 84 and the cover 1, a grommet 85 made of an aluminum alloy and having a substantially S-shaped cross section is provided as shown in FIG. 8. The grommet 85 has a first holding portion 85a that is bent in a convex shape on the inner peripheral side to hold the cover 1, and a shape that is bent in a convex shape on the outer peripheral side to hold the cushioning material 84. 2nd holding | maintenance part 85b. In the present embodiment, the second holding portion 85b and the first holding portion 85a are provided in this order from the cell starter 68 side.

  As shown in FIG. 8, when the cushion member 84 is attached to the collar member 82, the collar member 82 and the cushion member 84 are disposed between the collar member 82 and the cushion member 40 in the axial direction and radius of the bolt 83. A gap is formed in any direction. Accordingly, the shock absorber 84 is mounted on the cylindrical portion 87 of the collar member 82 so that the inner periphery thereof is displaceable in the axial direction and the radial direction of the bolt 83, and the vibration that is transmitted from the bolt 83 to the cover 1 is generated. , Buffer and suppress over its three-dimensional component.

  Hereinafter, the thin plate members 4 and 4a will be described with reference to FIGS. In the following description, the thin plate material 4 will be described, but the same description holds for the thin plate material 4a. 9 is an enlarged front view of the thin plate member 4, FIG. 10 is a cross-sectional view taken along the cutting plane line X10-X10 in FIG. 9, and FIG. 11 is a cross-sectional view taken along the cutting plane line X11-X11 in FIG. 12 is a cross-sectional view taken along the cutting plane line X12-X12 of FIG. 9, FIG. 13 is a cross-sectional view taken along the cutting plane line X13-X13 of FIG. 9, and FIG. It is an expanded sectional view.

  As shown in FIGS. 9 to 13, the thin plate member 4 used in the cover 1 of the present embodiment has a plurality of corrugated shapes 9 in which the raised portions 7 and the valley portions 8 are alternately repeated in the first direction. A shape that has a continuous shape extending along A1 and a shape in which another corrugated shape 9 extends along a second direction A2 that is a direction that intersects the first direction A1, and preferably is a direction orthogonal to the first direction A1. have.

  As shown in FIGS. 9 to 13, the protruding portion 7 has a first rising portion 10 that rises from the valley portion 8 with a height H <b> 1 and a height that is lower than the height H <b> 1. The second upright portions 11 rising with H2 are alternately arranged. Moreover, the said trough part 8 has the flat part 12 and the protrusion 13 alternately arranged as FIG.

  As shown in FIG. 10, the first upright portion 10 has a pair of side walls 14 and 15 that rise in a substantially trapezoidal shape at an obtuse angle θ <b> 1 as shown in FIG. 10, and ends of the side walls 14 and 15. 9 includes rising parts 17 and 18 formed extending in the direction of the arrow A1 in FIG. 9 and a recess 16 between the rising parts 17 and 18, respectively.

  On the other hand, the second upright portion 11 is formed by crushing the first upright portion 10 to a predetermined degree as will be described later, and forms an approximately base from the valley portion 8 at an obtuse angle θ2 as shown in FIG. A pair of side walls 19, 20 rising in shape, a pair of folded portions 21, 22 formed by folding the tips of the side walls 19, 20 toward each other, and a recess 23 between the folded portions 21, 22, It is comprised including. The folded portions 21 and 22 are bent so that the folded direction is a direction close to each other. Since the second upright portion 11 is formed by pressing and bending the first upright portion 10, the distance between the valley portion 8 and the turned-up portions 21 and 22 becomes a height H2 lower than the height H1.

  Further, as shown in FIGS. 10 and 11, the protruding portion 13 of the valley portion 8 is such that the base end portions of the side walls 19 and 20 of the second standing portion 11 are opposite to the rising direction of the second standing portion 11. In the direction, a pair of groove portions 24 and 25 each having a substantially arc shape and recessed along the direction of the arrow A1 in FIG. 3 are formed. These groove portions 24 and 25 form a pair of protrusions 26 and 27 on the opposite side of the rising direction of the second upright portion 11 of the thin plate material 4, and the function of the ribs in the metal plate 4 against the bending along the arrow A 2 direction of FIG. To realize. Further, since the trough 8 is pressed to form the grooves 24 and 25, periodic irregularities are formed along the longitudinal direction as shown in FIG.

  Each of the second upright portions 11 and the protrusions 13 has a broken line shape along a second direction A2 that is a direction substantially orthogonal to the first direction A1 that is a direction in which the plurality of waveform shapes 9 extend. It is formed to be continuous. Further, the portion between the side walls 19 and 20 has a corrugated shape 9 along at least one of the first direction A1 and the second direction A2, and the metal plate 4 is folded and folded on the metal plate 4 itself. The laminated portion 45 is configured.

  The cover 1 is formed by pressing the thin plate members 4, 4 a having such a shape into a three-dimensional shape along the outer shape of the cell starter 68. In the present embodiment, as shown in FIG. 5, a flange 28 in which the corrugated shape 9 is fully bent is formed on the outer peripheral portion of the side wall T <b> 1 of the cover 1 formed in a three-dimensional shape. 1 is folded back to the inner side to form a folded portion 29. When the folded portion 29 is not formed, the outer peripheral portion of the cover 1 is in a state where the sharp cut end portion of the blanked thin plate material 4 is directly exposed to the outside. Accordingly, the turn-back portion 29 is a cover for the assembling worker who holds the cover 1 in the assembling process of the cover 1 to the cell starter 68 in the manufacturing process of the vehicle or the maintenance of the vehicle after manufacturing. It is intended to prevent workers or general users who may have 1 from damaging their fingers.

  Further, the flange 28 realizes the function of a rib when the cover 1 vibrates, thereby reducing the vibration amplitude of the cover 1 and suppressing the occurrence of cracks in the cover 1. it can.

  Hereinafter, with reference to FIG. 5, one of the features of the cover 1 of the present embodiment will be described. Since the cover 1 of this embodiment is formed in a three-dimensional shape that conforms to the three-dimensional appearance of the cell starter 68 as described above, the cover 1 is a bent portion of the thin plate material 4 as shown in FIG. One or a plurality of ridge line equivalent portions 30 are formed. In the present embodiment, the thin plate member 4 is arranged such that the first direction A1 that is the longitudinal direction of the corrugated shape 9 is a direction intersecting a main ridge line equivalent portion 30 described later among the plurality of ridge line equivalent portions 30. Is pressed into a three-dimensional shape.

  Here, the main ridge line equivalent portion 30 is a bent portion where a relatively large curvature characterizing the overall shape of the cover 1 continues. That is, it means a bent portion extending over a relatively long length that substantially determines the external shape of the cover 1 among the various bent portions formed on the cover 1.

  When the cover 1 is attached to the cell starter 68, the cover 1 is also vibrated by transmission of vibration from the heat source HS. When the cover 1 vibrates due to this vibration, the cover 1 vibrates so that the portions of the cover 1 on both sides of the main ridge line corresponding portion 30 flutter. If such vibration is left unattended, a portion near the portion corresponding to the ridgeline 30 of the cover 1 is subject to metal fatigue due to repeated bending, and cracks are likely to occur.

  On the other hand, in the present embodiment, the first direction A1 of the plurality of corrugated shapes 9 formed on the cover 1 is a direction intersecting the main ridge line equivalent portion 30, preferably a direction orthogonal. Therefore, the corrugated shape 9 realizes the action of the rib against the vibration centered on the ridge line equivalent portion 30. Thereby, the vibration of the cover 1 can be suppressed, the occurrence of cracks in the cover 1 can be prevented, and the quality of the cover 1 can be significantly improved.

  Further, with respect to the vibration generated along the extending direction of the ridge line corresponding portion 30 described above, the vibration is intermittently extended along the second direction A2 and is continued along the first direction A1 as shown in FIGS. The second upright portion 11 is also capable of realizing a rib function and suppressing vibration.

  FIG. 14 is a simplified cross-sectional view showing the operation of the cover 1 of the present embodiment. Hereinafter, the operation of the cover 1 will be described with reference to FIG. As described above, the thin plate material 4 constituting the cover 1 of the present embodiment includes the laminated portion 45 in which the corrugated shape 9 is formed on the substantially entire surface and the thin plate materials 4 are overlapped.

  When the cover 1 undergoes surface vibration due to the vibration received by the cover 1 and generates vibration, such vibration is generated by the raised portion 7 and the valley portion 8 as schematically shown in FIG. In contrast to the width L4 of the raised portion 7 including the folded portions 21 and 22 of the standard time raised portion 7 that is not deformed, the width of the raised portion 7 becomes a width L5 larger than the standard time interval L4 at the extended portion. In the compressed region, the width of the raised portion 7 becomes a width L6 that is smaller than the standard interval L4.

  When the cover 1 vibrates, such an expansion / contraction operation occurs in each part over the entire surface of the cover 1. In the cover 1 of the present embodiment, the vibration applied from the outside is caused by the elastic deformation of the thin plate member 4 itself due to the expansion and contraction operation described above occurring in the raised portions 7 and the valley portions 8 on the entire surface of the cover 1. Converted to heat energy. Thereby, the vibration of the cover 1 can be suppressed.

  In addition, when the cover 1 generates a vibration that flutters as a whole due to the relatively low frequency band component of the vibration received by the cover 1, such vibration is shown as an example of operation in FIG. In addition, in the extended part of the cover 1 with respect to the distance between the tip portions of the folded portions 21 and 22 of the standard raised portion 7 and the width L4 in the raised portion 8 where the raised portion 7 and the raised portion 8 are not deformed, The interval between the tip portions of the folded portions 21 and 22 over the raised portion 7 is larger than the interval at the standard time, and the width over the plurality of trough portions 8 is also a width L5 when extended larger than the width L4. Moreover, in the compression site | part of the cover 1, the space | interval of the front-end | tip part of the folding | turning parts 21 and 22 becomes smaller than the space | interval of the said standard time over the some protruding part 7, It extends over the several trough part 8, and the width | variety is also the said. The extension width L6 is smaller than the width L4.

  Even when such a cover 1 generates vibrations that flutter over the whole, a considerable portion of the vibrations is converted into thermal energy by elastic deformation of the thin plate member 4 itself. This action can also suppress the vibration of the cover 1.

  In addition, since the laminated portion 45 is formed in the cover 1, in the case of the dimension examples of the lengths L 1, L 2, and L 3, the inventors of the present invention follow one curve of the waveform shape 9 according to the bending of the waveform shape 9. The length (hereinafter referred to as the perimeter) was measured. As a result, the peripheral length L0 is about 17 mm, and an extension allowance of about 55% can be realized with respect to the length L1 of one cycle of the waveform shape 9 (11 mm in this example).

  Many metal products manufactured by pressing, such as automobile parts, are made of iron or stainless steel. These iron materials and stainless steel materials are frequently used in terms of relatively high strength. On the other hand, in this embodiment, workability is improved by the elongation allowance of the thin plate material 4. That is, even when performing press working including deep drawing, it was confirmed that it has workability equal to or higher than that of conventional iron materials. As a result, it can be confirmed that the vibration damping alloy body can be used as the material of the cover 1, and in addition to the improvement of the vibration damping performance, the cover 1 with improved weight reduction and workability can be realized. it can.

  Furthermore, in the present embodiment, as described above, the cover 1 is prevented from being undesirably deformed or cracked. To achieve this, the thickness of the thin plate material 4 constituting the cover 1 is increased. Therefore, the need to increase the rigidity of the cover 1 or increase the number of support points for the cell starter 68 of the cover 1 is eliminated.

  As a result, an increase in the possibility of cracking in the vicinity of the support location due to an increase in the weight of the cover 1 assumed when the rigidity of the cover 1 is increased, or an increase in the support location of the cover 1 is assumed. Generation of cracks due to thermal strain can be prevented. In these respects, the reliability of the cover 1 is greatly improved.

  The cover 1 of the present embodiment as described above has a triple air layer composed of an air layer composed of a large number of gaps such as the recesses 23 and the valleys 8 and the space 40 for each thin plate member 4, 4 a. Will hold. This triple air layer realizes the action of the insulating layer with respect to heat, noise and vibration generated from the heat source HS. As a result, the degree to which the heat, noise and vibration generated from the heat source HS are dissipated to the cell starter 68 to be protected through the cover 1 is significantly suppressed by the presence of the triple air layer. The Therefore, the heat insulation performance, the sound insulation performance, the sound absorption performance, the vibration damping performance, and the durability related to these performances of the cover 1 can be significantly improved.

  Furthermore, in the present embodiment, the space 40 is such that the heat generated from the heat source HS passes through the cover 1 and is dissipated to the cell starter 68 even when the air layer in the space 40 is substantially stagnant. However, it is remarkably suppressed by the substantially stagnant air layer. Therefore, also by this point, the heat shielding performance of the cover 1 is significantly improved. In addition, this point also eliminates the need for using a special heat shielding member, and improves the heat shielding performance with a simple configuration.

  Further, in the present embodiment, since the mat-like base material layer is not necessary, the coating for compensating for the deterioration of the heat insulation performance and the vibration control performance due to the thermal fatigue and thermal breakdown accompanying the use of the base material layer. Layers are also unnecessary. Thereby, the manufacturing man-hour and the number of parts of the cover 1 are significantly reduced.

  Further, since the plurality of thin plate members 4 and 4a constituting the cover 1 are fixed to each other by point contact at joint portions 42 discretely set on the outer peripheral portion, from the thin plate member 4 facing the heat source HS, Transmission of heat, noise and vibration to the thin plate material 4a on the cell starter 68 side is remarkably suppressed. This also remarkably suppresses the degree to which the heat, noise and vibration generated from the heat source HS are dissipated to the cell starter 68 through the cover 1, and the heat insulating performance, sound insulating performance, sound absorbing performance, damping performance of the cover 1 are suppressed. Vibration performance and durability related to these performances are significantly improved.

  Moreover, in the cover 1 of this embodiment, the heat radiation and noise from the heat source HS are absorbed by the thin plate material 4 made of an aluminum alloy, and the thermal conductivity of the thin plate material 4 made of such an aluminum alloy has hitherto been used. Since it has a much lower thermal conductivity than aluminized steel sheets that are widely used, the heat distribution in the cover 1 is easily equalized, and the cover 1 is locally heated at a higher temperature than other parts. A situation where a spot is formed is prevented.

  Thereby, when the cover 1 of this example is used, various electrical equipment such as the cell starter 68 in this embodiment, hoses and ducts made of harnesses or synthetic resin materials, etc. are excessively heated by the thermal radiation. In addition, it is possible to prevent the occurrence of problems such as thermal damage such as characteristic changes or thermal deterioration, loss of quietness in the passenger compartment, or increase in external noise level.

  Furthermore, in the present embodiment, the cover 1 is prevented from being undesirably deformed or cracked. To achieve this, the thickness of the thin plate material 4 constituting the cover 1 is increased or a reinforcing member is used. The necessity of increasing the rigidity of the cover 1 or increasing the support portion of the cover 1 with respect to the cell starter 68 is eliminated. As a result, an increase in the possibility of cracking in the vicinity of the support location due to an increase in the weight of the cover 1 assumed when the rigidity of the cover 1 is increased, or an increase in the support location of the cover 1 is assumed. Generation of cracks due to thermal strain can be prevented. In these respects, the reliability of the cover 1 is greatly improved.

  In this embodiment, the cover 1 is not only composed of a pair of thin plate members 4 and 4a, but also a case where a thin metal plate is laminated on the thin plate member 4 to form a metal sheet. And a case where another type of metal sheet is laminated on the thin plate material 4. Furthermore, the case where synthetic resin sheets such as various rubbers and engineering plastics are laminated on the thin plate material 4 is also included.

  In the present embodiment, the thin plate members 4 and 4a are not limited as long as they are metallic materials having high brightness and gloss. In the above embodiment, the thin plate members 4 and 4a are made of an aluminum alloy. However, the thin plate members 4 and 4a are other metal materials having a high brightness surface color such as white or gray close to white and having gloss for heat reflection. I just need it. Such characteristics of the thin plate materials 4 and 4a may be realized, for example, by a process such as applying aluminum plating to a steel plate or the like. Regarding the present invention, the material should not be limited as long as the surface properties of the thin plate members 4 and 4a reflect heat well.

  FIG. 15 is a cross-sectional view of the cover 1a according to the second embodiment of the present invention. FIG. 15 is a diagram corresponding to FIG. 10 of the first embodiment. The cover 1a of the present embodiment is similar to the cover 1 of the first embodiment in terms of structure and material, and corresponding parts are denoted by the same reference numerals. Hereinafter, with reference to FIG. 15, the cover 1a of 2nd Embodiment of this invention is demonstrated. A feature of the present embodiment is that instead of the thin plate material 4 that is a single-layer metal sheet in the cover 1 of the first embodiment shown in FIGS. That is, a laminated body is used, and in this embodiment, the metal sheet is a laminated body made of a thin plate material 4.5. Details of this embodiment will be described below.

  As described in the first embodiment with reference to FIGS. 1 to 14, the thin plate members 4 and 5 used in the cover 1a of the present embodiment have the raised portions 7 and the valley portions 8 alternately repeated. The plurality of corrugated shapes 9 extend along the first direction A1 and have a shape that continues along a second direction A2 that is a direction intersecting the first direction A1, preferably a direction orthogonal to the first direction A1. . As shown in FIGS. 9 to 13, the raised portions 7 are alternately arranged with the first raised portions 10 and the second raised portions 11 rising from the valley portions 8 along the longitudinal direction thereof. . In addition, as shown in FIGS. 9 to 13, the valley portion 8 has flat portions 12 and protrusions 13 arranged alternately.

  Accordingly, as shown in FIG. 15, the protruding portion of the raised portion 7 of the thin plate material 5 fits into the inner peripheral portion of the raised portion 7 of the thin plate material 4 that is bent. Further, also in the second upright portion 11, the side walls 19, 20 are formed in an inwardly curved shape with the tip portion wider than the base end portion. Even in such a second upright portion 11, the protruding portion of the second upright portion 11 of the thin plate material 5 is fitted in the inner curved portion of the second upright portion 11 of the thin plate material 4. Such portions such as the first upright portion 10, the second upright portion 11 and the trough portion 8 are meshing portions 40 in which the thin plate members 4 and 5 are slidably engaged with each other due to external vibration or bending displacement. It is configured as.

  With such a meshing portion 40, the thin plate members 4 and 5 can be firmly fixed to each other without using any special fixture or fastener. This is because the mutual coupling of the thin plate members 4 and 5 is due to the mechanical meshing relationship between them. Further, in the corrugated shape 9 along at least one of the first direction A1 and the second direction A2, the meshing portion 40 is folded on the thin plate members 4 and 5 by folding the thin plate members 4 and 5 themselves. The laminated portion 45 is configured.

  Hereinafter, one of the features of the cover 1a of the present embodiment will be described with reference to FIG. The cover 1a of this embodiment is formed in a three-dimensional shape along the three-dimensional appearance of the cell starter 68, similarly to the cover 1 of the above-described embodiment. One or a plurality of ridge line equivalent portions 30 which are bent portions are formed. Also in the present embodiment, the thin plate material 4, so that the first direction A <b> 1 that is the longitudinal direction of the waveform shape 9 is a direction intersecting the main ridge line equivalent portion 30 among the plurality of ridge line equivalent portions 30. 5 is pressed into a three-dimensional shape.

  As described above, the cover 1a of this embodiment is different from the cover 1 of the first embodiment except that the single-layer structure of the thin plate material 4 is changed to the laminated structure of the thin plate materials 4 and 5. Since it is the same structure, it is clear that in this embodiment, the same operation and effect as those described in the first embodiment can be realized.

  As shown in FIG. 15, the cover 1 a of this embodiment is made of the same material as the thin plate material 4 in the above embodiment, and uses a thin plate material 5 having a plate thickness different from that of the thin plate material 4. One of the features is that the metal sheets 100 are configured by laminating the plate materials 4 and 5.

  The thin plate members 4 and 5 are selected so that the plate thicknesses are different from each other, for example, a plate thickness of 0.3 mm and a plate thickness of 0.125 mm. The resonance frequencies of the thin plate members 4 and 5 having different plate thicknesses are different from each other. Therefore, by selecting different plate thicknesses, the pair of metal sheets 100 in which the thin plate members 4 and 5 are meshed with each other are arranged with a space therebetween as in the first embodiment. Thereby, in a pair of metal sheets 100, the air layer comprised from the micro clearance gap which consists of the recessed part 23 mentioned above, the trough part 8, etc. becomes four layers, and when it combines with the said space, it has a quintuple air layer. become.

Thereby, in the cover 1a of this embodiment, the heat insulation performance, the sound insulation performance, the sound absorption performance, and the vibration suppression performance are further improved as compared with the case of the cover 1 in the first embodiment. Further, in the cover 1a of the present embodiment, the resonance frequencies of the thin plate members 4 and 5 cancel each other, so that vibration and sound generated by the cover 1a itself can be remarkably suppressed.

  Further, in the cover 1a of the present embodiment, as described above, the thin plate members 4 and 5 that are elastically deformable materials having the corrugated shape 9 formed on substantially the entire surface are configured to be slidable with respect to each other. The meshing portion 40 is configured, and the laminated portion 45 is further configured.

  In the present embodiment, since the cover 1a is formed by laminating the thin plate members 4 and 5, the thin plate members 4 and 5 corresponding to the mutual friction caused by the sliding of the plurality of thin plate members 4 and 5 in the meshing portion 40 correspond to vibration. The part is converted into thermal energy. Also by this, the vibration of the cover 1a itself due to the vibration received by the cover 1a can be further suppressed.

  As a result, the cover 1a that achieves a significantly higher vibration damping performance than covers manufactured from existing aluminized steel sheets can be significantly reduced in weight, so the location where the cover 1a is attached to the cell starter 68 Can be reduced. Therefore, the number of bolts for attachment and the number of attachment parts of the cover 1a can be reduced, and the configuration of the cover 1a can be simplified. Thereby, the manufacturing process can be simplified and the manufacturing cost can be reduced. In addition, since the weight of the cover 1a can be reduced, it is possible to suppress damage due to fatigue of a portion attached to the cell starter 68 due to vibration.

  Further, since the covers 1 and 1a are reduced in weight, the number of attachment parts and the number of attachment bolts to the cell starter 68 can be reduced. Therefore, the cover 1 and 1a are removed from the cell starter 68 when recycling. Work becomes much easier. In this respect, the man-hours for recycling can be significantly reduced.

  Still another embodiment of the present invention will be described with reference to FIGS. 1 to 14 based on the first embodiment. The feature of this embodiment is that a large number of through holes are formed in the thin plate material 4a on the cell starter 68 side in the cover 1 of the first embodiment. Other configurations are the same as those of the cover 1 of the first embodiment as an example.

  Since the cover of the present embodiment has such a configuration, in this embodiment, a sound absorbing action based on the principle of Helmholtz resonance is realized. By appropriately selecting the plate thickness, aperture ratio, hole diameter, and the like of the thin plate members 4 and 4a corresponding to the vibration and noise frequency bands to be sound-absorbed, it is possible to realize a sound-absorbing action for a desired frequency band. .

  Therefore, in the present embodiment, in addition to the effects described in the first embodiment, the sound absorbing action by the Helmholtz resonance can also be achieved, and the sound insulation performance, the sound absorption performance, and the vibration damping performance are further improved.

  The scope of the present invention is not limited to the above-described embodiments, and includes a wide variety of modifications without departing from the spirit of the present invention. As an example, while each of the above embodiments shows a cover attached to the cell starter 68, the present invention is an exhaust system including a cover and an under cover, a cylinder head cover, and a muffler attached to an exhaust manifold of an automobile. It can be applied to pipes and ducts, and the target of implementation is not limited to automobiles, but it can be applied to any cover that requires functions such as heat insulation, sound insulation, sound absorption, vibration suppression, etc. Needless to say.

  The present invention is not limited to covers for automobile cell starters described in the embodiments, but is widely implemented in industrial fields that require shielding of at least one of heat and vibration, such as automobile undercovers and exhaust system covers. can do. Further, the present invention is not limited to automotive applications, and can be implemented in a wide range of industrial fields that suppress the dissipated heat and vibration with respect to a heat source that generates heat and vibration.

It is a front view of cover 1 of one embodiment of the present invention. 2 is a front view of an engine 61 with a cover 1 attached. FIG. 2 is a left side view of an engine 61. FIG. 3 is a front view showing a coining range of the cover 1. FIG. It is sectional drawing seen from the cut surface line X5-X5 of FIG. It is sectional drawing seen from the cut surface line X6-X6 of FIG. It is sectional drawing seen from the cut surface line X7-X7 of FIG. FIG. 7 is an enlarged cross-sectional view in the vicinity of a portion X8 in FIG. It is an enlarged front view of the thin plate material. It is sectional drawing seen from the cut surface line X10-X10 of FIG. It is sectional drawing seen from the cut surface line X11-X11 of FIG. It is sectional drawing seen from the cut surface line X12-X12 of FIG. It is sectional drawing seen from the cut surface line X13-X13 of FIG. 3 is an enlarged cross-sectional view of a thin plate material 4. FIG. It is sectional drawing of the cover 1a of 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the silencer 51 which is a prior art. FIG. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a Cover 4, 4a Thin board material 8 Valley part 9 Corrugated shape 23 Recess 40 Space 68 Cell starter 100 Metal sheet A1 1st direction A2 2nd direction

Claims (4)

High brightness and glossy metal formed into a three-dimensional shape corresponding to any of the shape of the heat source that generates heat and vibration, or the shape of the protection target to be protected against the heat and vibration from the heat source A metal laminated cover made of materials,
A plurality of metal sheets made of the metal material and subjected to corrugation along a plurality of directions intersecting each other over the entire surface are laminated with a space between each other,
Each metal sheet has a large number of gaps formed by corrugation over the entire surface,
A metal laminated cover characterized in that each metal sheet is fixed to each other by point contact at discrete joints set on the outer periphery. Each of the metal sheets is formed by laminating a plurality of metal plates made of the metal, and each metal sheet is formed with a wave shape in which valleys and ridges are alternately repeated along the first direction. 2. The metal laminate according to claim 1, wherein another corrugated shape in which a valley portion and a raised portion are alternately repeated is formed continuously along a second direction intersecting with the first direction. Mold cover. 2. The metal laminated cover according to claim 1, wherein the plurality of metal plates constituting the metal sheet are selected to have different thicknesses. The metal sheet facing the heat source among the plurality of metal sheets is formed with a plurality of through holes over at least a range separating the space from the other metal sheets. The metal laminated cover according to any one of the above.

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