JP2020050274A - Car panel structure - Google Patents

Abstract

To maximize the sound insulation efficiency of the double wall panel by maintaining the weight balance of the double wall panel.SOLUTION: In a vehicle panel structure, a double wall panel 50 in which a sealed intermediate layer 53 is formed is provided between opposed inner and outer walls 51 and 52. The double wall panel 50 constitutes at least one of the front and rear, left and right, and upper and lower walls 7 of a passenger space 2. The double wall panel 50 is composed of fixed portions 54, 55 attached to the vehicle body and non-fixed portions 57a, 58a. Weight of the vehicle parts attached to the non-fixed portion of the inner wall 51 and the non-fixed portion of the inner wall, and the vehicle parts attached to the non-fixed portion of the outer wall and the non-fixed portion of the outer wall, including the weight of the vehicle parts 59, 60, 62 attached to the non-fixed part, are set almost identical.SELECTED DRAWING: Figure 4

Description

  According to the present invention, a double wall panel on which a sealed intermediate layer is formed is provided between opposed inner and outer walls, and at least one of the front, rear, left, right, and upper and lower walls of the occupant space is provided by the double wall panel. The present invention relates to a structured panel structure of an automobile.

In recent years, a technology has been developed in which a vehicle body panel is configured by a double wall panel including an inner wall and an outer wall having a sealed intermediate layer, and this double wall panel is excellent in sound insulation and heat insulation.
When the floor panel forming the floor of the passenger compartment is composed of the double wall panel, the inner wall (upper wall) of the floor panel is provided with a sound absorbing material and a floor mat, so that the inner wall (upper wall) is provided. And the outer wall (lower wall) loses its weight balance.

When the dash panel is composed of the above-mentioned double wall panel, a heat insulator for preventing heat damage is attached to the front wall (outer wall) of the dash panel, so that the outer wall (front wall), the inner wall (rear wall) and Weight balance is lost.
As described above, when the weight balance between the inner wall and the outer wall is lost, the resonance frequency of the double-walled panel increases (refer to [Equation 1] described later and FIG. 9), and the efficiency of sound insulation can be maximized. It becomes difficult.

Meanwhile, Patent Document 1 discloses a double-walled panel in which a hollow portion is formed between opposed inner and outer walls, and a core material having a predetermined thickness is sealed in the hollow portion. By using a damping material as the damping material, the damping material is formed in a spherical granular state or a fibrous material that is not fixed in contact with each other, so as to convert sound energy into kinetic energy, thereby providing soundproofing and soundproofing. It has excellent heat insulation properties.
The double wall panel is used as a partition between an engine room and a passenger compartment of an automobile and other partitions.

  However, when the double wall panel disclosed in Patent Document 1 is applied to an automobile panel structure such as a dash panel or a floor panel, there is no disclosure or suggestion about the weight balance of the double wall panel.

JP 2001-242873 A

  The present invention has been made in view of such a problem, and has an automobile panel structure capable of maintaining the weight balance of the double wall panel and maximizing the sound insulation efficiency of the double wall panel. The purpose is to provide.

  According to the present invention, a double wall panel on which a sealed intermediate layer is formed is provided between opposed inner and outer walls, and at least one of the front, rear, left, right, and upper and lower walls of the occupant space is provided by the double wall panel. A panel structure for an automobile, comprising: a fixed portion in which the double-walled panel is attached to a vehicle body; and a non-fixed portion, including the weight of a vehicle component attached to the non-fixed portion. And the vehicle parts attached to the non-fixed part of the inner wall and the non-fixed part of the inner wall, and the vehicle parts attached to the non-fixed part of the outer wall and the non-fixed part of the outer wall are set to have substantially the same weight.

  The inner wall and the outer wall may be formed of aluminum, magnesium, iron or other metal, a thermosetting resin such as a polyester resin, a thermoplastic resin such as polypropylene, a fiber reinforced plastic such as CFRP, GFRP, or another resin. .

  According to the above configuration, including the weight of the vehicle parts attached to the non-fixed portion of the double wall panel, the weight of the inner wall side and the outer wall side is set to be substantially the same, so that the resonance frequency of the double wall panel is reduced. The effective mass that influences can be minimized, and by minimizing the effective mass, it is possible to set the resonance frequency to a low frequency range where the occupant does not care more, maximizing the efficiency of sound insulation by the double wall panel Can be demonstrated to the maximum extent. (Refer to [numerical I] described later, FIG. 9)

  As an embodiment of the present invention, the double wall panel is a floor panel forming a floor surface of the occupant space, and a sound absorbing material and a floor mat are attached to a non-fixed portion of the upper wall panel as the inner wall, At least one of a regenerative battery, a canister, and a temperature sensor is attached to a non-fixed portion of the lower wall panel.

  According to the above configuration, the weight of the sound absorbing material and the floor mat that is always attached to the non-fixed portion of the upper wall panel is reduced, and at least one of the regenerative battery, canister, and temperature sensor is attached to the non-fixed portion of the lower wall panel. And a large weight difference between the upper wall panel side and the lower wall panel side of the double wall panel can be suppressed.

As an aspect of the present invention, an occupant seat is provided in the occupant space, and the seat is attached to a frame member that supports at least the periphery of the double wall panel.
According to the above configuration, since the seat is attached to the skeletal member, a large weight of the seat and the occupant sitting on the seat is received by the skeletal member, and the large weight is urged by the double wall panel. Can be suppressed.

  As an aspect of the present invention, the double wall panel is a dash panel located at a front part of the occupant space, a heat insulator is attached to a non-fixed part of a front wall panel as the outer wall, and a rear wall as the inner wall The control unit is attached to the non-fixed part of the panel.

  The control unit can be set in the engine control unit when setting the front of the dash panel to the engine room, and can be set in the motor control unit when setting the front of the dash panel to the motor room.

  According to the above configuration, the weight of the heat insulator for preventing heat damage, which is always attached to the panel vibration surface of the front wall panel of the dash panel, can be substantially offset by attaching the control unit to the non-fixed portion of the rear wall panel. A large difference in weight between the wall panel side and the rear wall panel side can be suppressed.

  As an embodiment of the present invention, the double wall panel is a roof panel located above the occupant space, the outer wall is formed to have a larger weight than the inner wall, and the inner wall panel as the inner wall is not provided. The top ceiling is attached to the fixed part.

According to the above configuration, the following effects can be obtained.
In other words, by increasing the weight of the outer wall relative to the inner wall in order to enhance the impact resistance, the outer wall is prevented from being deformed when an impact is applied to the roof panel, and is always attached to the non-fixed portion of the inner wall panel. By providing such a top ceiling, it is possible to suppress a large difference in weight between the outer wall side and the inner wall panel side.

  According to the present invention, it is possible to maintain the weight balance between the inner wall and the outer wall of the double wall panel, and to maximize the sound insulation by the double wall panel.

A perspective view of an automobile having a panel structure according to the present embodiment FIG. 1 is a schematic cross-sectional view of a main part taken along line AA in FIG. 1. 1 is a schematic cross-sectional view of a main part along the line BB in FIG. FIG. 2 is an enlarged sectional view of a main part on the left side of the vehicle in FIG. 2. Enlarged sectional view of a main part on the right side of the vehicle in FIG. Model diagram showing the double wall panel by the spring-mass-damper model Main part enlarged sectional view of the dash panel shown in FIG. Enlarged sectional view of a main part of the roof panel shown in FIG. Characteristic diagram showing the relationship between sound insulation volume and noise frequency

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a perspective view of an automobile having a panel structure according to the present embodiment, FIG. 2 is a schematic cross-sectional view of a main part along line AA in FIG. 1, and FIG. 1 is a schematic cross-sectional view of a main part along line BB of FIG.

<Body structure>
In FIG. 1, a dash panel 3 is provided for partitioning an engine room 1 (a motor room in the case of an electric vehicle) and a vehicle compartment 2 in the front-rear direction of the vehicle. An apron 4 extending is provided, and a front side frame 5 extending forward from the dash panel 3 to the vehicle inside and below the apron 4 in the vehicle width direction is provided. A bumper beam 6 extending in the vehicle width direction is mounted on the vehicle.

The front side frame 5 is a vehicle body strength member having a closed cross section extending in the front-rear direction of the vehicle by fixing the front side frame outer and the front side frame inner together.
A floor panel 7 forming the floor surface of the vehicle compartment 2 is continuously provided at a lower rear end of the dash panel 3, and a vehicle protruding into the vehicle compartment 2 is provided at the center of the floor panel 7 in the vehicle width direction. A tunnel portion 8 extending in the front-rear direction is provided, and a rear floor 10 extending rearward is provided at the rear end of the floor panel 7 via a kick-up portion 9 extending in the vertical direction.

  A hinge pillar 11 extending in the vehicle vertical direction is provided at an outer end of the dash panel 3 in the vehicle width direction, and a lower end of the hinge pillar 11 is connected to a side sill 12 extending in the vehicle front-rear direction. A front pillar 13 extending inclining rearward and upward of the vehicle is connected.

  The hinge pillar 11 is a body strength member having a closed cross section extending in the up-down direction of the vehicle by joining and fixing the hinge pillar outer and the hinge pillar inner. Similarly, the front pillar 13 is also a vehicle body strength member having a closed cross section extending obliquely by joining and fixing the front pillar outer and the front pillar inner.

  The rear end of the front pillar 13 is connected to a roof side rail 14 extending in the front-rear direction of the vehicle, and the rear end of the roof side rail 14 is connected to a rear pillar 15 extending rearward and downward and inclined downward from the vehicle. doing. As shown in FIG. 2, the roof side rail 14 is a vehicle body strength member having a closed cross section 14c extending in the front-rear direction of the vehicle by fixing and fixing a roof side rail outer 14a and a roof side rail inner 14b. The rear pillar 15 is a vehicle body strength member having a closed cross section extending obliquely by joining and fixing the rear pillar outer and the rear pillar inner.

  As shown in FIG. 1, an intermediate portion in the front-rear direction of the roof side rail 14 and an intermediate portion in the front-rear direction of the side sill 12 are connected by a center pillar 16 extending in the vertical direction of the vehicle. The center pillar 16 is a vehicle body strength member having a closed cross section extending and extending in the vehicle vertical direction by joining and fixing the center pillar outer and the center pillar inner.

  Then, a front door opening 17 surrounded by the hinge pillar 11, the front pillar 13, the roof side rail 14, the center pillar 16, and the side sill 12 is formed, and the front door opening 17 is used as a front door 18 as a side door (see FIG. 2) so that it can be opened and closed.

  As shown in FIG. 1, a rear portion of the roof side rail 14 and a rear portion of the side sill 12 are vertically connected by an intermediate pillar 19 and a rear wheel house portion 20 to form a center pillar 16, a roof side rail 14, and an intermediate pillar. A rear door opening 21 is formed, which is surrounded by a rear wheel house 20, a side sill 12, and a rear door (not shown).

  Further, as shown in FIG. 1, the upper ends of the left and right front pillars 13 are connected by a front header 22 extending in the vehicle width direction, and the upper ends of the left and right rear pillars 15 are connected by a rear header 23 extending in the vehicle width direction. , A space surrounded by the rear header 23 and the left and right roof side rails 14 is covered with a roof panel 24.

  As shown in FIG. 3, the front header 22 has a closed cross section 22c extending in the vehicle width direction by fixing and fixing the front header outer 22a and the front header inner 22b. Similarly, the rear header 23 also has a closed cross section 23c extending in the vehicle width direction by joining and fixing the rear header outer 23a and the rear header inner 23b.

As shown in FIGS. 2 and 3, the roof panel 24 is fixed to the front header 22, the rear header 23, and the roof side rail 14 using an adhesive 25.
As shown in FIGS. 1 and 3, a front window glass 27 is provided at an upper end of the dash panel 3, a front end of the front header 22, and a front window glass opening 26 surrounded by the left and right front pillars 13, 13 in the vehicle width direction. Are located. As shown in FIG. 3, the front window glass 27 is bonded and fixed to each of the elements 3, 22, 13 using an adhesive 28.

  On the other hand, as shown in FIG. 3, a lift gate 29 is attached to the rear header 23 so as to open and close the luggage compartment opening. As shown in FIG. 1, an under cover 30 is provided below the engine room 1 to rectify the air flowing under the floor.

<Door structure>
The front door 18 as a side door shown in FIG. 2 includes a door body 18M, a door glass 18G, and a door sash 18S.
The door body 18M includes a door outer panel 35 including a double-wall panel 34 having a closed intermediate layer 33 (air layer in this embodiment) formed in a closed cross section between the opposed inner wall 31 and outer wall 32. A door inner panel 40 including a double wall panel 39 on which a closed intermediate layer 38 (air layer in this embodiment) is formed is provided in a closed cross section between the opposed inner wall 36 and outer wall 37.

  The lower end of the door outer panel 35 and the lower end of the door inner panel 40 are joined, and a door internal space 41 is formed between the panels 35 and 40. The lower end of the front door 18 overlaps with the side sill 12, and the upper half of the door sash 18 S overlaps with the roof side rail 14.

<Structure of tunnel section>
FIG. 4 is an enlarged sectional view of a main part on the left side of the vehicle in FIG. 2, and FIG. 5 is an enlarged sectional view of a main part on the right side of the vehicle in FIG.
As shown in FIGS. 2, 4, and 5, the tunnel section 8 is formed by an extruded member made of a light metal such as aluminum or an aluminum alloy.

  The tunnel portion 8 is formed integrally with an outer projecting portion 82 projecting outward from the left and right sides of the lower portion of the main body portion 81 toward the vehicle width direction with respect to the main body portion 81 having a gate-shaped cross section. The portion 82 supports the inner end in the vehicle width direction of the floor panel 7 composed of a double wall panel described later.

  As shown in FIGS. 4 and 5, the outer protruding portion 82 includes a horizontal upper wall 83, a horizontal lower wall 84, and a side wall 85 that vertically connects the outer ends of the upper and lower walls in the vehicle width direction. And a plurality of joints 86, 87 extending in the vehicle width direction. A plurality of closed sections S1, S2, S3 extending in the front-rear direction of the vehicle are formed in the outer protruding portion 82, and the side wall is formed. 85 is formed in a slanting shape located on the outer side in the vehicle width direction toward the lower side.

  As shown in FIG. 2, an exhaust pipe 88 (or a propeller shaft) is provided outside the vehicle, that is, below the tunnel portion 8, and a lower open side of the tunnel portion 8 is covered with a tunnel cover member 89. I have.

<Structure of side sill>
As shown in FIGS. 2, 4 and 5, the side sill 12 is made of a light metal extruded member such as aluminum or an aluminum alloy, and the side sill 12 is a floor panel made of a double wall panel described later. 7 is configured to support the outer end in the vehicle width direction.

  As shown in FIGS. 4 and 5, the side sill 12 has a horizontal upper wall 91, a horizontal lower wall 92, and an inner end in the vehicle width direction and an outer end in the vehicle width direction of each of the upper and lower walls. The vehicle has an inner wall 93 and an outer wall 94 connected to the vehicle, and a plurality of nodes 95 and 96 extending in the vehicle width direction. A plurality of closed sections S4, S5, S6 extending in the front-rear direction of the vehicle are provided in the side sill 12. Is formed, and the inner side wall 93 is formed to be inclined such that it is located on the inner side in the vehicle width direction as it goes downward.

  Here, in the present embodiment, the upper wall 83, the nodes 86, 87, and the lower wall 84 of the outer protruding portion 82 on the side of the tunnel 8 and the upper wall 91, the nodes 95, 96, and the lower wall of the side sill 12 are provided. 2, are formed at the same height position. As shown in FIG. 2, between the upper wall 83 of the outer protruding portion 82 on the tunnel portion 8 side and the upper wall 91 on the side sill 12 side. , A sheet support frame 90 for supporting the sheet is horizontally mounted.

<Seat arrangement structure>
The floor panel 7 forms a floor surface of the passenger compartment 2 as an occupant space. The floor panel 7 is formed by a double wall panel 50 (details will be described later), and left and right for seating the occupant. The seats 43 and 44 are attached via a seat support frame 90 to the outer projection 82 of the tunnel portion 8 as a frame member that supports at least the periphery of the double wall panel 50 and the side sill 12.

  Each of the left and right seats 43, 44 is composed of a separate seat, and each of the seats 43, 44 has a seat cushion 43c, 44c forming a seating surface of the occupant, and a seat back 43B forming a backrest surface of the occupant. , 44B and headrests 43H, 44H for holding the occupant's head.

  Here, a seat slide rail is provided between the seat support frame 90 and the seat cushions 43c and 44c, but illustration of the seat slide rail is omitted for convenience of illustration.

<Schematic structure of dash panel>
By the way, as shown in FIG. 3, the dash panel 3 includes a dash panel main body 3A extending vertically and an upper piece portion extending rearward and upward from an upper end of the dash panel 3A and supporting a lower end of the front window glass 27. 3U and a lower piece 3L extending rearward and downward from the lower end of the dash panel main body 3A and connected to the floor panel 7.

<Structure of double wall panel>
As shown in FIG. 3, the dash panel 3 forms a front wall of the passenger compartment 2 as an occupant space, and the floor panel 7, the kick-up portion 9, and the rear floor 10 are walls below the passenger compartment 2. The roof panel 24 forms a wall on the upper side of the cabin 2.

Each of these walls (dash panel 3, floor panel 7, kick-up section 9, rear floor 10, and roof panel 24) is formed by a double wall panel 50.
As shown in FIGS. 2 and 3, the double-walled panel 50 has a closed intermediate layer 53 (air layer in this embodiment) formed in a closed cross section between the opposed inner wall 51 and outer wall 52. The peripheral edges of the inner wall 51 and the outer wall 52 are connected to each other at the peripheral edge of the double wall panel 50.

The inner wall 51 of the double-walled panel 50 forming each wall is located on the vehicle cabin 2 side, and the outer wall 52 is located on the outside of the vehicle.
Here, the inner wall 51 and the outer wall 52 are formed of aluminum, magnesium, iron or other metal or a thermosetting resin such as polyester resin, a thermoplastic resin such as polypropylene, a fiber reinforced plastic such as CFRP or GFRP, or another resin. However, in this embodiment, it is formed of resin. The thickness of the sealed intermediate layer 53 is preferably in the range of 15 mm to 50 mm in consideration of practicality.

  As shown in FIG. 3, in the dash panel 3 that forms the front wall of the passenger compartment 2 that is the occupant space, the inner wall 51 and the outer wall 52 of the dash panel main body 3A are formed flat and parallel. The inner wall 51 and the outer wall 52 of the upper piece 3U and the lower piece 3L are formed flat and substantially parallel.

  As shown in FIGS. 2 and 3, also in the double wall panel 50 constituting the floor panel 7, the kick-up portion 9, the rear floor 10, and the roof panel 24, the inner wall 51 and the outer wall 52 are formed flat and parallel. Have been.

  <Structure of floor panel>

As shown in FIGS. 4 and 5, in the double wall panel 50 constituting the floor panel 7, an inner side wall 54 that covers an inner end of the sealed intermediate layer 53 in the vehicle width direction and an outer side in the vehicle width direction of the sealed intermediate layer 53. An outer wall 55 covering the end is provided.
The inner side wall 54 is formed so as to be located on the outer side in the vehicle width direction toward the lower side, and the outer side wall 55 is formed so as to be located on the inner side in the vehicle width direction toward the lower side.

  The inclination structure (inclination angle) of the side wall 85 on the tunnel portion 8 side and the inclination structure (inclination angle) of the inner wall 54 on the floor panel 7 side are set to be the same or substantially the same, and the inner wall surface on the side sill 12 side. 93 and the inclined structure of the outer wall 55 on the floor panel 7 side are set to be the same or substantially the same (with respect to the opening angle between the side wall 85 and the inner wall 93, the inner wall 54 and the outer wall 55 The floor panel 7 composed of the double wall panel 50 is fitted and fixed between the side wall 85 and the inner wall 93 by a wedge structure.

In this embodiment, there is a space between the side wall 85 on the tunnel portion 8 side and the inner wall 54 on the floor panel 7 side, and a space between the inner wall 93 on the side sill 12 side and the outer wall 55 on the floor panel 7 side. The floor panel 7 composed of the double wall panel 50 is fitted and fixed between the frame members (tunnel 8 and side sill 12) with an adhesive 56 interposed therebetween.
Here, the upper surface of the inner wall 51 of the double wall panel 50 is formed at the same height position as the upper surfaces of the upper joints 86 and 95 from the viewpoint of the side impact load transmission.

  As shown in FIGS. 4 and 5, the inner wall 51 of the double wall panel 50, the upper node 95 of the side sill 12, and the upper node 86 of the outer protrusion 82 of the tunnel 8 are at the same height position. , The side collision load can be transmitted to the node 86 on the tunnel section 8 side via the node 95 and the inner wall 51, and the load can be dispersed.

  Further, the left and right ends of the double wall panel 50 are preferably fastened to the side sill 12 and the tunnel portion 8 by using fastening members, and a weld nut is provided for the side sill 12 and the tunnel portion 8 made of an extruded member. Therefore, it is effective to form a tapping screw at a bolt fastening portion, or to use a turn nut or an anchor bolt for a hollow wall.

  Similarly, the lower surface of the outer wall 52 of the double wall panel 50 is the same as the lower surface of the lower wall 92 of the side sill 12 and the lower surface of the lower wall 84 of the outer protruding portion 82 in the tunnel portion 8 in terms of the side impact load transmission. It is formed to be at the height position.

As shown in FIGS. 4 and 5, in the floor panel 7 formed by the double wall panel 50, the inner wall 51 becomes the upper wall panel 57 and the outer wall 52 becomes the lower wall panel 58.
FIG. 4 shows the structure of the floor panel 7 on the left side of the vehicle, and FIG. 5 shows the structure of the floor panel 7 on the right side of the vehicle. In this embodiment, the floor panel 7 is separated by a tunnel portion 8 at the center in the vehicle width direction. 7 is divided into two right and left sides in the vehicle width direction.

  The non-fixed portions 57a of the left and right upper wall panels 57 of the floor panel 7 thus divided into two right and left portions (the non-fixed portions that are not fixed to the vehicle body vibrate using the middle portion thereof as an antinode of vibration. Also in the non-fixed portion, which is referred to as a panel vibration surface), a sound absorbing material 59 and a floor mat 60 as vehicle components are laid on the entire upper surface.

In the floor panel 7 on the left side of the vehicle shown in FIG. 4, a guide portion 57b formed integrally with or integrally with the upper wall panel 57 is provided on the lower surface of the upper wall panel 57, and a harness 61 is provided in the guide portion 57b. Is inserted. The guide portion 57b is formed continuously or intermittently in the vehicle longitudinal direction. By arranging the harness 61 on the upper wall panel 57 side, the workability of the electrical connection to a vehicle component (not shown) that needs to be energized is improved.
Further, a canister 62 for adsorbing evaporated fuel as a vehicle component is attached to a panel vibration surface 58a of a lower wall panel 58 of the floor panel 7 on the left side of the vehicle shown in FIG. 4 through an attachment opening 58b.

  The canister 62 is mounted and fixed on a mounting plate 63 which is flush with the lower wall panel 58, and the periphery thereof is covered with a cover member 64. The bolt 65 is attached to the sealing intermediate layer 53 by fastening a bolt 66 from below.

  On the other hand, as shown in FIG. 5, a regenerative battery 68 as a vehicle component is attached via a support bracket 67 to the lower surface of the panel vibration surface 58a of the lower wall panel 58 in the floor panel 7 on the right side of the vehicle. The periphery of the regenerative battery is covered with a protective cover 69.

Then, vehicle parts (sound absorption in FIG. 4) attached to the panel vibration surfaces 57a, 58a of the double wall panel 50 except for a fixing portion (see the inner wall 54 and the outer wall 55) where the double wall panel 50 is attached to the vehicle body. The material 59, the floor mat 60, the harness 61, the canister 62, and the weight of the sound absorbing material 59, the floor mat 60, and the regenerative battery 68 in FIG. The weights of the panel 57 and the lower wall panel 58 are set to be substantially the same.
FIG. 6 is a model diagram showing the double wall panel 50 by a spring-mass-damper model.

The resonant frequency of the double-walled panel 50 and f _rm, and the effective mass of the inner and outer each wall 51 and 52 and m _e, the spring modulus of the sealing intermediate layer 53 (i.e., air as the gas for forming the sealing intermediate layer 53 (Ease of compression) is k [N / m], the resonance frequency f _rm can be represented by the following [Equation 1].
[Equation 1]

Further, the above equation the effective mass m _e, respectively spring modulus k is the following [Equation 2], can be represented by [Equation 3].
[Equation 2]

Here, m ₁ includes the weight of the outer wall 52 as the incident side panel on which the noise is incident, but includes the weight of a vehicle component when the vehicle part is mounted on the panel vibration surface of the outer wall 52. m ₂ is the weight of the inner wall 51 as an output side panels noise is output, however, when the vehicle component is mounted to the panel plane of vibration of the inner wall 51, including its weight. The unit of the weight m ₁ of the outer wall 52 and the weight m ₂ of the inner wall 51 are both [kg].
[Equation 3]

ρ is the density of air as a gas, c is the speed of sound, d is the distance between the walls, and ρc ² is the bulk modulus E (gas modulus) of the sealed intermediate layer 53 (air layer).

Said the effective mass m _e represented by Equation 2, as is clear from the relationship of the weight m ₂ of weight m ₁ and the inner wall of the outer wall, the mass ratio of the outer wall 52 side and the inner wall 51 side is a one-to- 1, when the weight m ₂ of weight m ₁ and the inner wall 51 side of the outer wall 52 side are equal, it is possible to maximize the effective mass m _e. Furthermore, as it is clear from the relationship between the resonance frequency f _rm and effective mass m _e represented by [Formula 1], to maximize the effective mass m _e, lowering the resonant frequency f _rm of the double-walled panel 50 be able to. That is, the transmission loss of the double-walled panel deteriorates at the resonance frequency point as shown in FIG.

  That is, FIG. 9 is a characteristic diagram showing a relationship between the sound insulation (transmission loss) (TL) and the noise frequency (frequency) according to the number of one to five panels constituting the panel structure. Note that waveforms L1 and L2 in FIG. 9 show the case of a single-wall and double-wall panel structure, respectively.

  As shown in FIG. 9, if the noise frequency is about 450 Hz or less, it can be seen that one panel has the highest sound insulation as compared with the double wall panel.

  On the other hand, when the noise frequency is higher than about 450 Hz, the double-walled panel has a much higher sound insulation volume than a single panel, and the resonance frequency point is in a low frequency range where the occupant does not care. Easy to set.

  As described above, the automobile panel structure of the present embodiment shown in FIGS. 4 and 5 includes the double wall panel 50 in which the sealed intermediate layer 53 is formed between the opposed inner wall 51 and outer wall 52. A vehicle panel in which at least one of the front, rear, left, right, and top and bottom walls (the floor panel 7 in the embodiment of FIGS. 4 and 5) of the occupant space (see the cabin 2) is constituted by the double wall panel 50. And a fixed portion to which the double wall panel 50 is attached to the vehicle body and a non-fixed portion (panel vibrating surfaces 57a, 58a), including the weight of the vehicle parts attached to the non-fixed portion. The weight of the non-fixed portion of the inner wall 51 and the vehicle component attached to the non-fixed portion of the inner wall 51 is substantially the same as the weight of the non-fixed portion of the outer wall 52 and the vehicle component attached to the non-fixed portion of the outer wall 52. (See FIGS. 4 and 5) ).

  According to this configuration, the weight of the inner wall 51 and the outer wall 52 is set to be substantially the same, including the weight of the vehicle parts attached to the panel vibration surfaces 57a, 58a of the double wall panel 50, The sound insulation efficiency of the wall panel 50 can be maximized.

  In the vehicle panel structure of the present embodiment, the double wall panel 50 is the floor panel 7 that forms the floor of the occupant space (see the cabin 2), and the upper wall panel 57 as the inner wall 51. A sound absorbing material 59 and a floor mat 60 are attached to a panel vibration surface 57a as a non-fixed portion of the lower wall panel 58, and a regenerative battery 68, a canister 62, at least one of the temperature sensors is attached (see FIGS. 4 and 5).

  According to this configuration, the weight of the sound absorbing material 59 and the floor mat 60 necessarily attached to the panel vibration surface 57a of the upper wall panel 57 is added to the regenerative battery 68, the canister 62, and the temperature sensor of the panel vibration surface 58a of the lower wall panel 58. At least one of them can be substantially canceled out, and a large difference in weight between the upper wall panel 57 side and the lower wall panel 58 side of the double wall panel 50 can be suppressed.

  Furthermore, in the vehicle panel structure of the present embodiment, seats 43 and 44 for seating the occupant are provided in the occupant space (see the cabin 2). It is attached to a skeletal member (see tunnel 8 and side sill 12) that supports at least the periphery (see FIG. 2).

  According to this configuration, since the seats 43 and 44 are attached to the frame members (the tunnel portion 8 and the side sill 12), the large weight of the seats 43 and 44 and the occupant sitting on the seats 43 and 44 is reduced by the above-mentioned frame members (the tunnel portion). 8, the side sill 12) is received, and the large weight can be suppressed from being biased by the double wall panel 50.

  In FIGS. 4 and 5, the upper wall panel 57 and the lower wall panel 58 constituting the floor panel 7 are made of resin and have the same thickness. However, the upper wall panel 57 located on the indoor side allows passengers to get on and off. Therefore, while securing the rigidity is required, the lower wall panel 58 located on the outdoor side only has the undercover function and does not require much rigidity.

  Therefore, the upper wall panel 57 may be formed of metal, or may be formed of a resin plate having a larger thickness than the lower wall panel 58. Also in this case, if the weight on the upper wall panel 57 side and the weight on the lower wall panel 58 side are set to be equal including the weight of the vehicle parts attached to the panel vibration surface, the double wall panel 50 Sound insulation efficiency can be maximized.

  The mounting structure of the vehicle components such as the canister 62 and the regenerative battery 68 shown in FIGS. That is, a structure in which the canister 62 is attached to the lower wall panel 58 on the right side of the vehicle and the regenerative battery 68 is attached to the lower wall panel 58 on the left side of the vehicle may be adopted. Also, in the drawing, an arrow OUT indicates an outside in the vehicle width direction, an arrow IN indicates an inside in the vehicle width direction, and an arrow UP indicates an upper side of the vehicle.

<Dash panel structure>
The dash panel 3 shown in FIG. 7 is a panel located in front of the passenger compartment 2 as an occupant space, and partitions an engine room or a motor room and the passenger compartment 2 in the front-rear direction of the vehicle. In the dash panel 3 formed by the above, the inner wall 51 becomes the rear wall panel 45, and the outer wall 52 becomes the front wall panel 46.

  The panel vibration surface 46a of the front wall panel 46 as the outer wall 52, specifically, both the front surface of the outer wall 52 forming the dash panel main body 3A and the lower surface of the outer wall 52 forming the lower piece 3L are provided for preventing heat damage. Is attached.

  A control unit 49 is mounted on a panel vibration surface 45a of the rear wall panel 45 as the inner wall 51 via a bracket 48, and the periphery of the control unit 49 is covered with a cover 49C. The above-mentioned control unit 49 is mounted on the passenger side, which is advantageous in terms of space.

  The panel of the double wall panel 50 is formed except for a solid portion where the dash panel 3 formed by the double wall panel 50 is attached to the vehicle body (left and right ends in the vehicle width direction where the dash panel 3 is attached to the hinge pillar). Including the weight of the vehicle parts (control unit 49, see heat insulator 47) attached to the vibration surfaces 45a, 46a, the rear wall panel 45 side as the inner wall 51 side and the front wall panel 46 side as the outer wall 52 side. The weights are set to be substantially the same.

  As described above, the panel structure of the vehicle according to the present embodiment shown in FIG. 7 includes the double wall panel 50 in which the sealed intermediate layer 53 is formed between the inner wall 51 and the outer wall 52 facing each other. An automobile panel structure in which at least one of the front and rear, left, right, and upper and lower walls (dash panel 3) of the occupant space (vehicle compartment 2) is formed by the wall panel 50, the double wall panel 50 is attached to the vehicle body. The inner wall 51 includes a fixed portion to be attached and a non-fixed portion (panel vibrating surfaces 45a, 46a), and includes the weight of vehicle components (control unit 49, heat insulator 47) attached to the non-fixed portion. The vehicle parts attached to the non-fixed part and the non-fixed part of the inner wall 51 and the vehicle parts attached to the non-fixed part of the outer wall 52 and the non-fixed part of the outer wall 52 are set to have substantially the same weight. There (see Figure 7).

  According to this configuration, the weight of the inner wall 51 side and the outer wall 52 side including the weight of the vehicle components (the control unit 49 and the heat insulator 47) attached to the panel vibration surfaces 45a and 46a of the double wall panel 50 is included. Since they are set to be substantially the same, the sound insulation efficiency of the double wall panel 50 can be maximized.

  In the vehicle panel structure of the present embodiment, the double wall panel 50 is the dash panel 3 located in the front part of the occupant space (the cabin 2), and the front wall panel 46 as the outer wall 52. The heat insulator 47 is mounted on the panel vibration surface 46a, and the control unit 49 is mounted on the panel vibration surface 45a of the rear wall panel 45 as the inner wall 51 (see FIG. 7).

  Here, when the front of the dash panel 3 is set to the engine room 1, the control unit 49 is set to the engine control unit. When the front of the dash panel 3 is set to the motor room, the control unit 49 is set to the motor control unit. Can be set.

  According to this configuration, the weight of the heat insulator 47 for preventing heat damage always attached to the panel vibration surface 46 a of the front wall panel 46 of the dash panel 3 is reduced, and the control unit 49 is attached to the panel vibration surface 45 a of the rear wall panel 45. As a result, the front wall panel 46 side and the rear wall panel 45 side can be prevented from having a large weight difference.

  In FIG. 7, arrow F indicates the front of the vehicle, arrow R indicates the rear of the vehicle, and arrow UP indicates the upper part of the vehicle.

<Roof panel structure>
As shown in FIG. 8, in the roof panel 24 forming the upper wall portion of the passenger compartment 2, the inner wall 51 is an inner wall panel 71 and the outer wall 52 is an outer wall panel 72.

  In the double wall panel 50 located above the occupant space (see the cabin 2), the outer wall 52 (outer wall panel 72) is thicker and heavier than the inner wall 51 (inner wall panel 71). As a result, the outer wall panel 72 has improved collision resistance.

  Further, on the panel vibration surface 71 a of the inner wall panel 71 as the inner wall 51, a top sealing 73 (vehicle part) as an interior material is provided with a plurality of clips integrated with or separate from the top sealing 73. Attachment is made by using the 74. As shown in FIG. 8, the left and right sides of the top ceiling 73 in the vehicle width direction are curved to face the lower surfaces of the left and right roof side rail inners 14 b.

  Further, a room lamp 75 is attached to the inner wall panel 71 via a top ceiling 73, and the room lamp 75 is arranged so as to be located on the surface of the top ceiling 73 on the passenger compartment 2 side, and A harness 76 is connected to the lamp 75.

  The roof panel 24 composed of the double wall panel 50 is fixed to the left and right roof side rails 14 (see FIG. 8) as the vehicle body, the front header 22, and the rear header 23 (see FIG. 3). Excluding the front, rear, left and right side wall portions), including the weight of the vehicle parts (see at least the top ceiling 73 of the top ceiling 73 and the room lamp 75) attached to the panel vibration surface 71a of the double wall panel 50, The weight of the inner wall panel 71 side as the inner wall 51 and the outer wall panel 72 side as the outer wall 52 are set to be substantially the same.

  As described above, the panel structure of the vehicle according to the present embodiment shown in FIG. 8 includes the double wall panel 50 in which the sealed intermediate layer 53 is formed between the inner wall 51 and the outer wall 52 facing each other. An automobile panel structure in which at least one of the front, rear, left, right, and upper and lower walls (roof panel 24) of the occupant space (cabin 2) is formed by the wall panel 50, the double wall panel 50 is attached to the vehicle body. It is composed of a fixed portion to be attached and a non-fixed portion (panel vibrating surface 71a), and includes the weight of vehicle parts (at least top sealing 73 among top ceiling 73 and room lamp 75) attached to the non-fixed portion. Thus, the weight of the non-fixed portion of the inner wall 51 and the vehicle component attached to the non-fixed portion of the inner wall 51 and the weight of the non-fixed portion of the outer wall 52 and the vehicle component attached to the non-fixed portion of the outer wall 52 are substantially reduced. Those that are set to one (see Figure 8).

  According to this configuration, the weight of the inner wall 51 and the outer wall 52 is set to be substantially the same, including the weight of the vehicle component (top sealing 73) attached to the panel vibration surface 71a of the double wall panel 50. Thus, the efficiency of sound insulation by the double wall panel 50 can be maximized.

  Further, in the vehicle panel structure of the present embodiment, the double wall panel 50 is the roof panel 24 located above the occupant space (the cabin 2), and the outer wall 52 weighs less than the inner wall 51. The top wall 73 is attached to the panel vibration surface 71a of the inner wall panel 71 as the inner wall 51 (see FIG. 8).

According to this configuration, there are the following effects.
That is, by increasing the weight of the outer wall 52 with respect to the inner wall 51 in order to enhance the impact resistance, the deformation of the outer wall 52 when an impact is applied to the roof panel 24 is suppressed, and the panel of the inner wall panel 71 is suppressed. By providing the top ceiling 73 which is always attached to the vibration surface 71a, it is possible to suppress a large weight difference between the outer wall 52 side and the inner wall panel 71 side.

  In FIG. 8, an arrow LEFT indicates a left side in the vehicle width direction, and an arrow RIGHT indicates a right side in the vehicle width direction.

In correspondence between the configuration of the present invention and the above embodiment,
The occupant space of the present invention corresponds to the passenger compartment 2 of the embodiment,
Similarly, the wall portions correspond to the dash panel 3, the floor panel 7, and the roof panel 24,
The non-fixed portions correspond to the panel vibration surfaces 45a, 46a, 57a, 58a, 71a,
The skeletal members correspond to the tunnel section 8 and the side sill 12,
The vehicle parts correspond to the sound absorbing material 59, the floor mat 60, the canister 62, the regenerative battery, the heat insulator 47, the control unit 49, and the top sealing 73 of FIG.
The present invention is not limited only to the configuration of the above embodiment.

  For example, the present invention may be applied to other wall portions such as the rear floor 10 to which an insulator and a silencer can be attached as vehicle components, in addition to the dash panel 3, the floor panel 7, and the roof panel 24.

  Further, the material and / or plate thickness of the inner wall 51 and the outer wall 52 are changed in accordance with the portion of the wall to which the double wall panel 50 is applied, so that the weights of the inner wall 51 and the outer wall 52 are made different. Also in this case, the weight of the inner wall 51 and the outer wall 52 may be set to be equal or substantially equal to each other, including the weight of the vehicle component mounted on the panel vibration surface.

  As described above, the present invention provides a double-walled panel on which a sealed intermediate layer is formed between opposed inner and outer walls, and the double-walled panel includes at least front and rear, left, right, and upper and lower occupant spaces. The present invention is useful for a panel structure of an automobile in which any of the walls is formed.

2… Vehicle (occupant space)
3. Dash panel (wall)
7 ... Floor panel (wall)
8 ... Tunnel part (frame member)
12. Side sill (frame member)
24 Roof panel (wall)
43, 44 ... seat 45 ... rear wall panel 46 ... front wall panel 47 ... heat insulator (vehicle parts)
49 ... Control unit (vehicle parts)
50 double wall panel 51 inner wall 52 outer wall 53 sealed middle layer 57 upper wall panel 58 lower wall panel 59 sound absorbing material (vehicle parts)
60 ... Floor mat (vehicle parts)
62 ... Canister (vehicle parts)
68 ... regenerative battery (vehicle parts)
71 ... inner wall panel 72 ... outer wall panel 73 ... top sealing (vehicle parts)
45a, 46a, 57a, 58a, 71a ... panel vibration surface (non-fixed portion)

Claims (5)

Between the opposed inner and outer walls, a double-walled panel on which a sealed intermediate layer is formed,
A vehicle panel structure in which at least one of the front and rear, left and right, and upper and lower walls of the occupant space is configured by the double wall panel,
The double wall panel is composed of a fixed portion attached to the vehicle body and a non-fixed portion,
Including the weight of the vehicle part attached to the non-fixed part, the vehicle part attached to the non-fixed part of the inner wall and the non-fixed part of the inner wall, and the vehicle part attached to the non-fixed part of the outer wall and the non-fixed part of the outer wall The panel structure of an automobile, wherein the weight of the vehicle is set to be substantially the same. The double wall panel is a floor panel that forms a floor surface of the occupant space,
A sound absorbing material and a floor mat are attached to the non-fixed portion of the upper wall panel as the inner wall,
The vehicle panel structure according to claim 1, wherein at least one of a regenerative battery, a canister, and a temperature sensor is attached to a non-fixed portion of the lower wall panel as the outer wall. An occupant seat is provided in the occupant space,
The vehicle panel structure according to claim 2, wherein the seat is attached to a skeletal member that supports at least the periphery of the double-walled panel. The double wall panel is a dash panel located at the front of the occupant space,
A heat insulator is attached to a non-fixed portion of the front wall panel as the outer wall,
The vehicle panel structure according to claim 1, wherein a control unit is attached to a non-fixed portion of the rear wall panel as the inner wall. The double wall panel is a roof panel located above the occupant space,
The outer wall is formed to be heavier than the inner wall,
The vehicle panel structure according to claim 1, wherein a top ceiling is attached to a non-fixed portion of the inner wall panel as the inner wall.

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