JP2013147168A - Structure for reducing noise of cooling duct for in-vehicle battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise propagating to a vehicle interior by a noise reduction structure that is configured to reflect the noise by a shielding plate provided in an air inlet.SOLUTION: A noise reduction structure of an in-vehicle battery cooling duct 18 for supplying an in-vehicle battery with air that is taken by a suction effect of a cooling fan device from an air inlet opened to a vehicle interior includes: a sound insulating plate 42 disposed in the cooling duct 18 at a position spaced on a side of the cooling fan device relative to the inlet; and a sound absorbing material 44 provided on a side of the cooling fan device relative to the sound insulating plate 42 and serving as a noise sound wave propagation suppressing means for suppressing a noise sound wave from propagating toward the inlet.

Description

  The present invention relates to an in-vehicle battery cooling duct, and more particularly to a noise reduction structure for an in-vehicle battery cooling duct.

  In vehicles such as automobiles equipped with a hybrid system, a cooling device for cooling a battery pack containing a secondary battery is installed. The cooling device has a cooling fan device that takes air in the passenger compartment as cooling air by a suction force into the cooling duct from an air intake port. The cooling air is guided to the cooling fan device through the cooling duct, and is caused to flow around the secondary battery in the battery pack from the cooling fan device, whereby the secondary battery is cooled by the cooling air. The cooling fan device incorporates a fan, and the cooling air is sucked and pumped by the rotation of the fan.

  Since noise is generated when the cooling fan device is driven, various structures for reducing the noise transmitted from the cooling fan device to the passenger compartment through the cooling duct have been proposed. For example, the following Patent Document 1 describes a noise reduction structure configured to shield a part of an air intake port with a shielding plate and reflect noise propagating from the cooling fan device side toward the air intake port. Has been. According to this noise reduction structure, it is possible to reduce noise propagating into the passenger compartment as compared with the case where no shielding plate is provided.

JP 2005-231455 A

[Problems to be Solved by the Invention]
However, in the conventional noise reduction structure described above, in order to effectively reflect noise by the shielding plate, the area of the portion of the air intake port that is shielded by the shielding plate must be increased. For this reason, the flow resistance of the cooling air at the air intake port is increased, and the cooling effect on the in-vehicle battery is inevitably lowered.

  Moreover, if it is going to compensate that the cooling effect with respect to a vehicle-mounted battery falls by increasing the cooling air suction | inhalation effect | action by a cooling fan apparatus, it is necessary to make a cooling fan apparatus a thing of high output. In that case, the noise generated by the cooling fan device increases, so the noise cannot be effectively reduced.

  In addition, if the area of the shielding plate is set to be small so as to avoid a decrease in the cooling effect on the in-vehicle battery as much as possible, the noise reflecting action by the shielding plate is reduced. Therefore, noise that is not reflected by the shielding plate and propagates through the air intake port into the vehicle interior increases, so that the noise reduction effect is unavoidably reduced.

The present invention has been made in view of the above-described problems in a conventional noise reduction structure configured to reflect noise by a shielding plate provided in an air intake port. And the main subject of this invention is reducing the noise which propagates to a vehicle interior effectively compared with the past.
[Means for Solving the Problems and Effects of the Invention]

  According to the present invention, the main problem described above is a noise reduction structure for a cooling duct for an in-vehicle battery that supplies air taken into an in-vehicle battery through an intake opening that opens into the vehicle compartment by the suction action of the cooling fan device. A sound insulator disposed in the cooling duct at a position spaced from the intake port to the cooling fan device side and spaced from the wall surface of the cooling duct; and the cooling fan device with respect to the sound insulator. And a noise sound wave propagation suppressing means that suppresses the propagation of the noise sound wave toward the intake port, and is achieved by the noise reduction structure of the cooling duct for in-vehicle battery (structure of claim 1) Is done.

  According to the above configuration, the sound insulating body is disposed in the cooling duct, and the noise sound wave propagation suppressing means for suppressing the propagation of the noise sound wave toward the intake port is provided on the cooling fan device side with respect to the sound insulating body. It has been. Therefore, at least a part of the noise sound wave propagating from the cooling fan device side toward the intake port is blocked by the sound insulating body, and the noise sound wave propagation suppressing means suppresses the noise sound wave from propagating toward the intake port. it can. Therefore, for example, compared with the case where only one of the sound insulator and the noise sound wave propagation suppressing means is provided, the noise propagating into the vehicle interior can be effectively reduced.

  Further, since the sound insulator and the noise sound wave propagation suppressing means are provided at positions separated from the intake port toward the cooling fan device and separated from the wall surface of the cooling duct, the sound insulator and the noise sound wave propagation suppressing means are provided. The flow resistance of the cooling air at the air intake is not excessively increased. Therefore, the cooling effect on the in-vehicle battery does not decrease due to the increase in the flow resistance of the cooling air, and the cooling fan device does not need to have a high output.

  According to the invention, in the above configuration, the noise sound wave propagation suppressing means is configured to include a sound absorbing material fixed to the sound insulating body on the cooling fan device side with respect to the sound insulating body. (Structure of claim 2).

  According to the above configuration, at least a part of the noise sound wave propagating from the cooling fan device side toward the intake port can be blocked by the sound insulating body, and at least a part of the noise sound wave is absorbed by the sound absorbing material. Can do. Therefore, the noise propagating into the vehicle compartment can be reduced more effectively.

  Further, according to the present invention, in the above configuration, the noise sound wave propagation suppressing means includes a resonator that is provided on the cooling fan device side with respect to the sound insulation body and is integrated with the sound insulation body. (Structure of claim 3).

  According to the above configuration, at least a part of the noise sound wave propagating from the cooling fan device side toward the intake port can be blocked by the sound insulator, and at least a part of the noise sound wave can be silenced by the resonator. Therefore, it is possible to effectively reduce noise propagating into the vehicle interior. Further, since the resonator is integrated with the sound insulator, the noise reduction structure can be simplified as compared with the case where these are separate bodies.

  Further, according to the present invention, in the above configuration, the noise sound wave propagation suppressing means includes a hole provided in the cooling duct at a position spaced from the sound insulator to the cooling fan device side. The sound insulator is configured to reflect at least a part of the noise sound wave and guide the sound through the hole to the outside of the cooling duct (structure of claim 4).

  According to the above configuration, the cooling duct is provided with a hole at a position spaced from the sound insulation to the cooling fan device side, and at least a part of the noise sound wave is reflected by the sound insulation and is guided to the outside of the cooling duct through the hole. It is burned. Therefore, it is possible to effectively reduce noise propagating from the cooling duct through the intake port into the passenger compartment.

  According to the present invention, in the above configuration, the cooling duct is configured to form a diffuser in a region closer to the cooling fan device than the sound absorbing material. Constitution).

  According to said structure, the cooling duct has comprised the form of the diffuser in the area | region of the cooling fan apparatus side from the sound absorption material. Therefore, the vibration width of the noise sound wave propagating from the cooling fan device side toward the intake port can be reduced by the throat portion of the diffuser, and the noise sound wave can be efficiently guided to the sound absorbing material. Therefore, compared with the case where the portion formed by the diffuser is not provided, the sound absorbing effect by the sound absorbing material can be increased, and the noise reducing action can be improved.

  According to the present invention, in the above configuration, a sound absorbing material is fixed to the surface of the resonator (configuration of claim 6).

According to the above configuration, since both the silencing by the resonator and the sound absorption by the sound absorbing material can be performed, compared to the case where the sound absorbing material is not fixed to the surface of the resonator,
The noise reduction effect can be improved.

  According to the present invention, in the above configuration, a semi-transmissive sound absorbing material is disposed in the cooling duct on the cooling fan device side from the hole so as to face at least the sound insulating body. (Constitution of Claim 7)

  According to the above configuration, at least a part of the noise sound wave propagating from the cooling fan device side toward the intake port can be absorbed by the semi-transmissive sound absorbing material, and at least one of the noise sound waves reflected by the sound insulating body. The part can also be absorbed by the semi-transmissive sound absorbing material. Therefore, the noise reduction effect can be improved as compared with the case where the semi-transmissive sound absorbing material is not disposed at least in the cooling duct on the cooling fan device side from the hole so as to face the sound insulating body.

  According to the present invention, in the above configuration, the hole is configured to communicate with a space around the cooling duct isolated from the passenger compartment (configuration of claim 8).

  According to the above configuration, since the hole communicates with the space around the cooling duct isolated from the passenger compartment, the noise sound wave reflected by the sound insulation and guided to the space around the cooling duct through the hole is Propagation from space to the passenger compartment can be effectively prevented.

  According to the present invention, in the above configuration, the space is configured to be separated from a space in which the in-vehicle battery is disposed (configuration of claim 9).

  According to the above configuration, it is possible to reliably prevent the heated air in the space where the in-vehicle battery is disposed from flowing into the cooling duct through the space and the hole around the cooling duct by the suction action of the cooling fan device. Can do. Therefore, it is possible to reliably prevent the cooling effect on the in-vehicle battery from being reduced due to the recirculation of the heated air in the space where the in-vehicle battery is disposed.

  Further, according to the present invention, in the above configuration, the surface of the sound insulator on the side of the intake port is against the air flow from the intake port to the cooling fan device through the noise sound wave propagation suppressing means. It is comprised so that it may have a shape which reduces resistance (structure of Claim 10).

  According to the above configuration, the surface of the sound insulation body on the side of the intake port gives excessive flow resistance to the air flow from the intake port to the cooling fan device through the periphery of the noise sound wave propagation suppressing means, and thereby cooling air. It can prevent effectively that supply efficiency of this falls.

  According to the present invention, in the above configuration, the cooling duct is composed of a plurality of duct parts divided in a direction crossing the flow direction of the air flow, and the sound insulating body is integrated with at least one duct part. It is comprised so that it may be formed (structure of Claim 11).

  According to the above configuration, the number of parts can be reduced and the cooling duct provided with the noise reduction structure can be easily and efficiently compared with the case where the sound insulating body is formed separately from the duct parts. Can be formed.

It is a perspective view which shows the cooling device of the vehicle-mounted battery to which the noise reduction structure by this invention may be applied. 1 is a plan sectional view showing a first embodiment of a noise reduction structure according to the present invention. It is an illustration side view which shows the cooling duct in which the noise reduction structure of 1st embodiment was integrated. It is an illustrative exploded side view showing a cooling duct in which the noise reduction structure of the first embodiment is incorporated. It is sectional drawing which shows the other example which may be employ | adopted for the cross-sectional shape of a sound-insulating plate. It is a plane sectional view showing a second embodiment of the noise reduction structure according to the present invention. It is a perspective view which shows 3rd embodiment of the noise reduction structure by this invention. FIG. 8 is a plan sectional view taken along line VIII-VIII in FIG. 7. It is a longitudinal cross-sectional view which follows the line IX-IX of FIG. It is a plane sectional view showing a modification example of the third embodiment.

  The present invention will now be described in detail with reference to a few preferred embodiments with reference to the accompanying drawings.

  Prior to the description of the embodiment of the present invention, a vehicle battery cooling apparatus to which the noise reduction structure according to the present invention may be applied will be described with reference to FIG.

  In FIG. 1, reference numeral 10 denotes an entire battery pack cooling device in a vehicle such as an automobile equipped with a hybrid system. The cooling device 10 is configured to cool the battery pack 12. The battery pack 12 houses a battery module and an electronic device (not shown) inside a box-shaped casing 14. The battery module has a configuration in which a plurality of battery cells composed of secondary batteries such as a nickel cadmium battery, a nickel-hydrogen battery, and a lithium ion battery are stacked apart from each other.

  Above the casing 14, a cooling fan device 16 incorporating a fan and an electric motor that rotationally drives the fan is disposed. Although not shown in the drawing, the cooling fan device 16 communicates with the intake port of the casing 14 at the lower portion, and supplies cooling air to the inside of the casing 14 through the intake port. In addition, the cooling air supplied to the inside of the casing 14 cools those battery cells by passing around each battery cell, and flows out of the casing 14 through an exhaust port provided in a lower portion.

  The inner end of the cooling duct 18 is connected to the upper part of the cooling fan device 16. The cooling duct 18 extends in the lateral direction of the vehicle at the inner end portion, extends toward the front of the vehicle at the outer end portion, and is curved at the intermediate portion. An air intake port 20 is provided at the outer end of the cooling duct 18, and the air intake port 20 communicates with a vehicle compartment 28 via a bezel 26 provided on a garnish 24 located on the vehicle right side of the rear seat 22. Therefore, the air in the passenger compartment 28 is sucked into the cooling duct 18 as cooling air through the bezel 26 and the air intake 20 by the suction action of the cooling fan device 16, flows through the cooling duct 18, and is guided to the cooling fan device 16. It is burned.

  As shown in FIG. 1, the cooling device 10 and the battery pack 12 are disposed in a vehicle interior space 30 that is located behind the rear seat 22 and separated from the vehicle interior 28. The passenger compartment space 30 may be a luggage space in the case of a passenger car such as a sedan, or may be a space for an in-vehicle battery separated from both the passenger compartment 28 and the luggage space behind the rear seat 22.

In FIG. 1, the cooling duct 18 has a vertically-long rectangular cross-sectional shape with rounded corners, but may have an arbitrary cross-sectional shape such as a horizontally-long rectangular or circular shape. In FIG. 1, the cooling duct 18 is provided only on the right side of the vehicle, but may be provided on the left side of the vehicle. In that case, the cooling duct on the left side communicates with the cooling fan device 16 at the inner end, and enters the vehicle compartment 28 via a bezel (not shown) provided on the garnish 32 located on the left side of the rear seat 22 at the outer end. Configured to communicate.
[First embodiment]

  FIG. 2 is a plan sectional view showing a first embodiment of the noise reduction structure according to the present invention, and FIG. 3 is an illustrative side view showing a cooling duct incorporating the noise reduction structure of the first embodiment.

  2 and 3, reference numeral 40 denotes a first embodiment of the noise reduction structure according to the present invention as a whole. The noise reduction structure 40 is provided in a region separated from the air intake port 20 toward the cooling fan device 16. The cooling duct 18 is expanded in the vertical direction and the width direction in a region where the noise reduction structure 40 is provided, and a sound insulating plate 42 as a sound insulating body is disposed in the widened region 18X.

  In the first embodiment, the sound insulation plate 42 has a “<” shape that opens toward the cooling fan device 16, and the upper wall 18 </ b> U and the lower wall are perpendicular to the longitudinal direction of the cooling duct 18. It extends in the vertical direction between the portion 18D. The sound insulating plate 42 is formed of a material that functions to at least partially block noise sound waves propagating from the cooling fan device 16 side toward the air intake port 20 side. It may be formed of the same material as a material such as resin.

  A sound absorbing material 44 that functions as noise sound wave propagation suppressing means for suppressing noise sound waves from propagating toward the air intake 20 is fixed to the surface of the sound insulating plate 42 on the cooling fan device 16 side by means such as adhesion. ing. The sound absorbing material 44 extends to the cooling fan device 16 side than the side edges 42A and 42B of the sound insulating plate 42 which are spaced apart from each other in the horizontal direction. The sound absorbing material only portion 44A gradually decreases in width toward the cooling fan device 16 and has a rounded cross-sectional shape at the tip.

  The sound absorbing material 44 may be formed of any material excellent in sound absorbing property, but is preferably formed of a fiber aggregate material excellent in sound absorbing property. The fiber assembly may be any one of a long fiber, a short fiber or a whisker woven fabric and a short fiber or a whisker non-woven fabric, but the short fiber or whisker highly rigid non-woven fabric particularly excellent in sound absorption and shape retention. It is preferable that The fiber assembly may be a woven fabric laminate, a nonwoven fabric laminate, or a woven fabric and nonwoven fabric laminate. Furthermore, the fibers constituting the fiber assembly may be either organic fibers such as synthetic fibers or inorganic fibers.

  As shown in FIG. 2, the sound insulation plate 42 and the sound absorbing material 44 are separated from the side wall portions 18L and 18R of the cooling duct 18, and two shunt flow paths 46L and 46R are defined between the side wall portions. It is fixed. The space between the sound insulation plate 42 and the sound absorbing material 44 and the side wall portions 18L and 18R is such that the total flow path cross-sectional area Sx of the branch flow paths 46L and 46R is closer to the air intake 20 than the region 18X of the cooling duct 18 expanded. It is set to be larger than the channel cross-sectional area Sy of the region 18Y.

  The cooling duct 18 is viewed in the direction of noise propagation in the region 18Z closer to the cooling fan device 16 than the expanded region 18X, that is, in the direction of the region 18X expanded from the cooling fan device 16 side. The cross-sectional shape of the diffuser. In other words, the side wall portions 18L and 18R define the throat portion 48 having the smallest interval on the cooling fan device 16 side than the expanded region 18X. On the side of the cooling fan device 16 relative to the throat 48, the cooling fan device 16 is moved until the distance between the side walls 18L and 18R of the cooling duct 18 is substantially the same as their distance in the region 18Y. It gradually increases with time.

  The flow path cross-sectional area Sz of the throat 48 is set to a value smaller than the flow path cross-sectional area Sy of the region 18Y, and although not shown in the drawing, the width Wz of the throat 48 is the maximum width of the sound absorbing material 44. It is set to a value smaller than Wx. Further, the tip of the sound insulating plate 42 on the side of the air intake 20, the tip of the sound absorbing material 44 on the side of the cooling fan device 16, and the center of the throat 48 are aligned with the central plane 50 of the cooling duct 18.

  As shown in FIGS. 3 and 4, the cooling duct 18 includes an upper duct member 18MU and a lower duct member 18MD, and the two duct members are bonded to each other at bonding surfaces 18UF and 18DF facing each other. It is formed by joining together. The sound insulating plate 42 is formed as a member independent of the two duct members, and may be joined to the corresponding duct members at both ends by means such as adhesion, but integrally with the upper duct member 18MU or the lower duct member 18MD. It is preferably molded. In that case, the sound absorbing material 44 is fixed to the sound insulating plate 42 by means such as adhesion, and then when the two duct members are joined to each other, the tip of the sound insulating plate 42 is adhered to the other duct member by means such as adhesion. Bonded to the inner surface.

  In the cooling duct 18 incorporating the noise reduction structure 40 of the first embodiment configured as described above, the cooling air flowing in the region 18Y is divided into two branch channels 46L and 46R in the region 18X. The flow merges as it passes through the throat 48 in the region 18Z. As described above, the sound insulating plate 42 has a “<” shape that opens toward the cooling fan device 16, and the total channel cross-sectional area Sx of the branch channels 46 </ b> L and 46 </ b> R is greater than the channel cross-sectional area Sy of the region 18 </ b> Y. Therefore, the noise reduction structure 40 does not have an excessive flow path resistance. Therefore, it is possible to reliably prevent the cooling air intake efficiency from being reduced due to the noise reduction structure 40.

  The cross-sectional shape of the sound insulating plate 42 is not limited to the “<” shape opened toward the cooling fan device 16, and the sound absorbing material 44 is disposed while avoiding excessive flow resistance as much as possible. It may be any shape that can be held.

  For example, FIG. 5 shows another example that may be adopted for the cross-sectional shape of the sound insulating plate 42. (A) is an isosceles trapezoidal shape, (B) is an arrowhead shape, and (B) is an arch shape. Further, the cross-sectional shape of the sound insulating plate 42 may be a shogi piece shape, a semi-elliptical shape, a “U” shape (a staple needle shape), or the like.

  Further, the noise sound wave 52 generated by the cooling fan device 16 and propagating toward the air intake port 20 enters the region 18X from the region 18Z, and a substantial part thereof reaches the sound absorbing material 44 and is absorbed by the sound absorbing material 44. Sound absorption. Therefore, compared with the case where the noise reduction structure 40 is not provided, the noise propagating through the air intake 20 and the bezel 26 to the passenger compartment 28 can be reduced.

  In particular, in the first embodiment, a region 18Z having a diffuser cross-sectional shape is provided, and when the sound wave 52 passes through the region 18Z, the width of vibration is gradually reduced. The sound wave 52 expands the width of vibration in the region 18X, but the amount of energy of the sound wave 52 reaching the sound absorbing material 44 can be increased as compared with the case where the region 18Z is not provided. The sound absorption efficiency by 44 can be increased.

  In the first embodiment, the sound absorbing material-only portion 44A has a width that gradually decreases toward the cooling fan device 16 and has a cross-sectional shape that is rounded at the tip. Therefore, compared with a case where only the sound absorbing material has a rectangular cross-sectional shape, for example, the vortex flow of the cooling air on the cooling fan device 16 side is reduced more than the sound absorbing material 44, and the noise caused by the vortex flow is also ensured. Can be reduced. Further, the sound absorption efficiency of the sound absorbing material 44 can be increased as compared with the case where only the sound absorbing material has a triangular cross-sectional shape, for example.

  Note that the cross-sectional shape of the sound absorbing material only portion 44A is not limited to the above shape, and may be, for example, a semi-elliptical shape, a semi-circular shape, a trapezoidal shape, or a rectangular shape or a triangular shape. Good.

Further, when the sound insulating plate 42 is formed integrally with the upper duct member 18MU or the lower duct member 18MD, noise reduction is achieved compared to the case where the sound insulating plate 42 is a member independent of the two duct members. The portion of the structure 40 can be formed easily and efficiently. This effect can be obtained similarly in other embodiments described later.
[Second Embodiment]

  FIG. 6 is a plan sectional view showing a second embodiment of the noise reduction structure according to the present invention. In FIG. 6, the same members as those shown in FIG. 2 are denoted by the same reference numerals as those shown in FIG. The same applies to other embodiments described later.

  In the second embodiment, the noise reduction structure 40 includes a resonator 56 that functions as noise sound wave propagation suppression means, and the sound insulation plate 42 constitutes a part of the resonator 56 that is hollow inside. The resonator 56 has a rhombic cross-sectional shape and extends perpendicularly to the longitudinal direction of the cooling duct 18 along the sound insulating plate 42. As in the case of the first embodiment, the resonator 56 cooperates with the cooling duct 18 to define two branch channels 46L and 46R, and the relationship between the channel cross-sectional areas is the case of the first embodiment. It is set in the same way. Accordingly, even in the second embodiment, the noise reduction structure 40 does not have an excessive flow resistance, and the intake efficiency of the cooling air is surely lowered due to the noise reduction structure 40. Can be prevented.

  The two wall portions 56L and 56R on the cooling fan device 16 side of the resonator 56 are provided with a plurality of cylindrical introduction portions 58L and 58R, respectively. The introduction portions 58L and 58R are spaced apart from each other in the extending direction of the sound insulating plate 42, that is, in the direction perpendicular to the paper surface of FIG. The resonator 56 attenuates noise by resonating internal air with noise. Therefore, the inner diameters and lengths of the introduction portions 58L and 58R are set according to the noise to be attenuated by the resonator 56.

  In the illustrated embodiment, the sound absorbing material 44 is fixed to the outer surfaces of the two wall portions 56L and 56R by means such as adhesion. Although not shown in the drawing, the sound absorbing material 44 is also fixed to a portion between the plurality of introduction portions 58L and 58R. In the illustrated embodiment, the region 18Z is not provided with a portion having a cross-sectional shape of the diffuser, and the region 18Z has the same form as the region 18X.

  Thus, according to the second embodiment, at least a part of the noise sound wave 52 generated by the cooling fan device 16 and propagated toward the air intake port 20 enters the resonator 56 from the introduction portions 58L and 58R, and its considerable amount. The portion is muffled by the vibration damping action of the resonator 56. Therefore, compared with the case where the noise reduction structure 40 is not provided, the noise propagating through the air intake 20 and the bezel 26 to the passenger compartment 28 can be reduced.

  In particular, according to the illustrated second embodiment, the sound absorbing material 44 is fixed to the outer surfaces of the two wall portions 56L and 56R. Therefore, compared with the structure in which the sound absorbing material 44 is not fixed to the outer surfaces of the two wall portions 56L and 56R, it is possible to effectively reduce the noise propagating through the air intake 20 and the bezel 26 to the passenger compartment 28. Can do.

  In the illustrated embodiment, the introduction portions 58L and 58R are provided in a row in the wall portions 56L and 56R, respectively. However, one introduction portion may be provided in each wall portion, and a plurality of introduction portions may be provided. It may be provided in a row. Further, one or a plurality of introduction portions may be provided in a region where the wall portions 56L and 56R are connected to each other.

In the illustrated embodiment, the resonator 56 has a rhombic cross-sectional shape, but the angle formed by the two walls of the sound insulating plate 42 may be smaller than the angle formed by the walls 56L and 56R. Good. Further, the cross-sectional shape of the resonator 56 may be an arbitrary shape such as a polygon other than an ellipse or a rhombus, as long as it does not cause an excessive flow resistance against the air flow.
[Third embodiment]
7 is a perspective view showing a third embodiment of the noise reduction structure according to the present invention, FIG. 8 is a plan sectional view taken along line VIII-VIII in FIG. 7, and FIG. 9 is a longitudinal section taken along line IX-IX in FIG. FIG.

  In the third embodiment, the cooling duct 18 is expanded in the vertical direction in the vicinity of the air intake port 20, and the noise reduction structure 40 is provided in the expanded region 18X. Rectangular holes 60L and 60R are provided in the side walls 18L and 18R of the expanded region 18X, and the “U” -shaped cross section around the holes 60L and 60R except for the side on the cooling fan device 16 side. The sound insulation plate 42 extends so as to achieve the following. One side edge of the sound insulating plate 42 is integrally connected to one of the side walls 18L and 18R, and the other side edge is joined to the other of the side walls 18L and 18R by means such as adhesion.

  The sound insulating plate 42 is integrally formed with the end portion on the cooling fan device 16 side, and has flange portions 42FU and 42FD extending upward and downward, respectively. A strip-shaped sound absorbing material 44 is provided on the flange portions 42FU and 42FD. It is fixed by means such as adhesion. The sound absorbing material 44 extends in the up-down direction in a state of being provided between the flange portions 42FU and 42FD, and is in contact with the side walls 18L and 18R of the cooling duct 18 at both side edges or joined by means such as adhesion. Yes.

  The sound absorbing efficiency of the sound absorbing material 44 of the third embodiment may be lower than the sound absorbing efficiency of the sound absorbing material 44 of the first and second embodiments described above, and therefore the density of the sound absorbing material 44 is also the first and second. It may be lower than the density of the sound absorbing material 44 of the second embodiment. That is, the sound absorbing material 44 of the third embodiment may be a sound absorbing material that is semi-transparent to sound waves. Further, as shown in FIG. 9, the vertical length h of the sound absorbing material 44 is larger than the vertical length H of the area 18Z on the cooling fan device 16 side than the expanded area 18X. Is set.

  The sound insulating plate 42 is spaced from the bezel 62 provided on the garnish 32 toward the cooling fan device 16. The flange portions 42FU and 42FD and the sound absorbing material 44 are spaced apart from the upper wall portion 18U and the lower wall portion 18D of the cooling duct 18 in the vertical direction, and the region 18Z closer to the cooling fan device 16 than the expanded region 18X. It is also spaced from. Therefore, the cooling air flowing into the cooling duct 18 through the bezel 62 and the air intake 20 is divided into the upper and lower sides of the sound insulating plate 42 and the sound absorbing material 44 as shown by the arrow F in FIGS. It flows toward the cooling fan device 16 side.

  As shown in FIGS. 8 and 9, the end of the cooling duct 18 on the side of the air intake 20 is connected to a rib 32A provided inside the garnish 32 via an elastic body 64 such as a sponge. Yes. As shown in FIG. 8, the portion 32B inside the vehicle of the garnish 32 is spaced from the cooling duct 18 to the inside of the vehicle, and the rear seat 22 is located inside the portion 32B of the vehicle. The cooling duct 18 is spaced from the vehicle body member 66 such as a roof side panel to the inside of the vehicle, and a weather strip 68 made of an elastic material that eliminates a gap with the garnish 32 is attached to the front edge of the vehicle body member 66. ing.

  As shown in FIG. 8, between the cooling duct 18, the portion 32 </ b> B of the garnish 32, and the vehicle body member 66, at the same position in the vehicle front-rear direction as the sound absorbing material 44 or behind the vehicle, Partition members 70 and 72 are interposed, respectively. The partition members 70 and 72 are further on the vehicle front side than that, and separate the space 74 around the cooling duct 18 from a space where the battery pack 12, the cooling fan device 16, and the like are arranged, for example, a luggage space.

  Thus, according to the third embodiment, at least a part of the noise sound wave 52 generated by the cooling fan device 16 and propagating toward the air intake port 20 is first reduced by being absorbed by the sound absorbing material 44. Further, the noise sound wave 52 transmitted through the sound absorbing material 44 is reflected by the sound insulating plate 42. A part of the reflected sound wave 52 is absorbed by the sound absorbing material 44, and another part of the reflected sound wave 52 exits from the inside of the cooling duct 18 to the space 74 through the holes 60 </ b> L and 60 </ b> R.

  Therefore, according to the third embodiment, the sound is silenced by each of the above-described actions, so that the sound is more reliably transmitted to the vehicle compartment 28 via the air intake 20 and the bezel 26 as compared with the case where the noise reduction structure 40 is not provided. Noise can be reduced.

  In particular, according to the illustrated third embodiment, the length h in the vertical direction of the sound absorbing material 44 is greater than the length H in the vertical direction of the region 18Z on the cooling fan device 16 side than the expanded region 18X. Is set to Therefore, compared with the case where the length h is smaller than the length H, the sound absorbing effect by the sound absorbing material 44 can be enhanced.

  Moreover, the temperature of the air around the battery pack 12 is higher than the temperature of the cooling air. Therefore, when the space 74 around the cooling duct 18 is the same as or communicates with the space in which the battery pack 12, the cooling fan device 16 and the like are disposed, high-temperature air passes through the holes 60L and 60R and enters the cooling duct 18. The cooling effect on the battery pack 12 is reduced.

  According to the illustrated third embodiment, the space 74 around the cooling duct 18 is separated from the space where the battery pack 12, the cooling fan device 16, and the like are arranged by the partition members 70 and 72. Therefore, air around the battery pack 12 having a temperature higher than that of the cooling air is sucked into the cooling duct 18 through the holes 60L and 60R by the suction action of the cooling fan device 16, and due to this, with respect to the battery pack 12 It can prevent effectively that a cooling effect falls.

  In the illustrated third embodiment, the portion of the sound insulation plate 42 that extends in the vertical direction has a flat plate shape that extends in a direction crossing the longitudinal direction of the cooling duct 18. However, for example, as shown in FIG. 10, the sound insulation plate 42 is directed toward the holes 60L and 60R so that a part of the sound wave 52 reflected by the sound insulation plate 42 efficiently goes out to the space 74 through the holes 60L and 60R. And may be modified to tilt.

  Further, the cross-sectional shape for inclining the portion extending in the vertical direction of the sound insulating plate 42 is not limited to the “he” shape shown in FIG. 10, for example, a part of an arc shape or a polygonal shape. Such a shape may be used.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to the above-described embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art.

  For example, in each of the above-described embodiments, the cooling duct 18 is composed of the upper duct member 18MU and the lower duct member MD, and the two duct members are bonded to each other by means such as adhesion at joint surfaces 18UF and 18DF facing each other. It is formed by joining. However, the cooling duct 18 may be divided into portions other than the upper and lower portions, and may be divided into three or more portions.

  Further, in the first and second embodiments described above, the cooling duct 18 is expanded in the width direction and the vertical direction in the expanded region 18X, but is expanded only in the vertical direction, for example. It may be modified as follows.

  In the first embodiment described above, an area having a cross-sectional shape of the diffuser is provided on the cooling fan device 16 side of the expanded area 18X of the cooling duct 18. However, the area | region which has the cross-sectional shape of a diffuser may be abbreviate | omitted, and conversely may be applied to 2nd or 3rd embodiment.

  In the third embodiment described above, the sound absorbing material 44 is provided on the cooling fan device 16 side with respect to the holes 60L and 60R, but the same semi-permeable sound absorbing material is also provided on the surface of the sound insulating plate 42. The material may be fixed. Further, the sound absorbing material 44 on the cooling fan device 16 side with respect to the holes 60L and 60R may be omitted, and a semi-permeable sound absorbing material may be fixed only to the surface of the sound insulating plate 42.

  DESCRIPTION OF SYMBOLS 10 ... Cooling device, 12 ... Battery pack, 16 ... Cooling fan device, 18 ... Cooling duct, 20 ... Air intake, 24 ... Garnish, 26 ... Bezel, 28 ... Vehicle compartment, 40 ... Noise reduction structure, 42 ... Sound insulation plate 44 ... Sound absorbing material, 48 ... Throat, 52 ... Noise sound wave, 56 ... Resonator, 60L, 60R ... Hole, 70, 72 ... Partition member

Claims (11)

  The cooling fan device has a noise reduction structure for cooling the cooling duct for the on-vehicle battery that supplies the air taken in from the intake opening to the vehicle compartment to the in-vehicle battery by the suction action of the cooling fan device, and is spaced from the intake to the cooling fan device side. A sound insulator disposed in the cooling duct at the position, and noise sound wave propagation suppression provided on the side of the cooling fan device with respect to the sound insulator to suppress propagation of noise sound waves toward the intake port And a noise reduction structure for a vehicle-mounted battery cooling duct.   The noise of the cooling duct for in-vehicle batteries according to claim 1, wherein the noise sound wave propagation suppressing means includes a sound absorbing material fixed to the sound insulating body on the cooling fan device side with respect to the sound insulating body. Reduction structure.   The noise of the cooling duct for in-vehicle batteries according to claim 1, wherein the noise sound wave propagation suppressing means includes a resonator provided on the cooling fan device side with respect to the sound insulator and integrated with the sound insulator. Reduction structure.   The noise sound wave propagation suppressing means includes a hole provided in the cooling duct at a position spaced from the sound insulator to the cooling fan device side, and the sound insulator reflects at least a part of the noise sound wave. The noise reduction structure of the cooling duct for in-vehicle batteries according to claim 1, wherein the structure is guided to the outside of the cooling duct through the hole.   The noise reduction structure for a cooling duct for on-vehicle batteries according to claim 2, wherein the cooling duct is in the form of a diffuser in a region closer to the cooling fan device than the sound absorbing material.   The noise reduction structure for a cooling duct for on-vehicle batteries according to claim 3, wherein a sound absorbing material is fixed to the surface of the resonator.   The in-vehicle battery cooling duct according to claim 4, wherein a semi-transmissive sound absorbing material is disposed in the cooling duct on the cooling fan device side from the hole so as to face at least the sound insulating body. Noise reduction structure.   5. The noise reduction structure for a cooling duct for on-vehicle batteries according to claim 4, wherein the hole communicates with a space around the cooling duct isolated from the passenger compartment.   The noise reduction structure for a cooling duct for in-vehicle batteries according to claim 8, wherein the space is separated from a space in which the in-vehicle battery is arranged.   2. The surface of the sound insulating body on the side of the intake port has a shape that reduces resistance to an air flow from the intake port to the cooling fan device through the noise sound wave propagation suppressing unit. The noise reduction structure of the cooling duct for vehicle-mounted batteries as described in any one of thru | or 7.   9. The cooling duct according to claim 1, wherein the cooling duct is composed of a plurality of duct parts divided in a direction crossing a flow direction of the air flow, and the sound insulating body is formed integrally with at least one duct part. The noise reduction structure of the cooling duct for vehicle-mounted batteries as described in any one.

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