JP4848857B2 - Car cabin floor - Google Patents

Description

  The present invention relates to a passenger compartment floor of an automobile, and more particularly to a passenger compartment floor of an automobile in which vibrations that cause in-vehicle noise are reduced.

  FIG. 5 shows a typical example of a passenger compartment floor of an automobile. The passenger compartment floor 1 has left and right side edges connected to left and right rocker panels 5 of the vehicle body, respectively. In the passenger compartment floor 1, a plurality of floor cross members 6 are provided in the vehicle width direction on the upper surfaces of the left and right sides of the floor tunnel portion 10 at the center in the vehicle width direction, and a plurality of floor members 7 are provided in the front-rear direction on the lower surface of the floor. The vehicle interior floor 1 is being strengthened.

Further, as proposed in Patent Documents 1 and 2 below, a rigid member (load transmission member) is provided between the left and right seats, particularly between the driver seat and the passenger seat at the front of the passenger compartment, as proposed in Patent Documents 1 and 2 below. In the case of a side collision of the vehicle, a collision load acting on the side wall of the vehicle body such as one door is transmitted to the other side wall of the vehicle body via the left and right seats and the rigid member. There is something that can be secured.
Japanese Patent No. 2883805 JP 2001-151022 A

  By the way, the passenger compartment floor 1 vibrates due to vibrations transmitted from many vibration sources such as an engine and tires during traveling. In particular, vibrations of 140 Hz to 160 Hz during medium and high speed rotation of the engine, which is the main vibration source, are likely to cause a loud noise in the vehicle, and when a part of the passenger compartment floor resonates with this, the noise in the vehicle deteriorates. The phantom line in FIG. 5 exaggerates the amplitude of the state in which the half of the passenger compartment floor 1 with the floor tunnel 10 as a boundary resonates with the transmitted vibration.

  Conventionally, in order to reduce the vibration of the passenger compartment floor, frame parts such as floor cross members and floor members have been added to enhance the rigidity of the passenger compartment floor. However, the vehicle body weight has increased significantly, Cost increases. On the other hand, a means for controlling the vibration transmitted to the passenger compartment floor by setting a dynamic damper or the like in the engine mantle is taken, but the structure of the engine mount becomes complicated and the cost increases.

  Therefore, the present invention eliminates the need to add new parts, minimizes the increase in cost and weight of the vehicle body, and suppresses the vibration in a specific frequency range and reduces the noise of the vehicle interior. It was made as an issue to provide.

According to the present invention, between the left and right seats placed on the passenger compartment floor of the automobile, a collision load acting on the side wall of the vehicle body, such as one door, at the time of a side collision of the automobile or the like is integrated with the both seats. A box-shaped rigid member that is transmitted to the side wall of the vehicle body is provided. The rigid member is provided with a plurality of reinforcing plates extending between the left and right side surfaces and set to a predetermined mass, and the left and right side surfaces are opposed to the opposing surfaces of the two sheets, and the rigid member The member stands up on the passenger compartment floor and is supported by at least a pair of plate-like support portions facing each other at an interval in the left-right direction to form a dynamic damper, and the front and rear widths of the two support portions are set to different widths. By setting, the rigid members are supported with different support rigidity.

The dynamic damper is constructed using a rigid member that is provided between the left and right seats to ensure the safety of the vehicle interior in the event of a side collision of the vehicle. The resonance frequency range of the passenger compartment floor with respect to the vibration transmitted to the vehicle can be controlled, and the resonance frequency of the passenger compartment floor can be removed from the vibration frequency range causing the internal noise in the vehicle to reduce the internal noise. it can. In particular, by setting the mass and arrangement of the rigid member as described above , it is possible to ensure safety during a vehicle side collision and to effectively use the rigid member as a mass body of the dynamic damper.

Furthermore, since the rigid member is supported by the plate-like support portions facing each other at an interval in the left-right direction , the rigid member can be easily vibrated corresponding to the passenger compartment floor vibration.

In addition, the support rigidity of the left and right support portions is asymmetrical, whereby the rigid member is more likely to vibrate, and can be easily removed from the frequency range where the resonance frequency of the passenger compartment floor is likely to be an interior noise.

  An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1 and FIG. 2, the passenger compartment floor 1 is provided so that the left and right side edges are coupled to the left and right rocker panels 5 which are the skeleton members of the vehicle body, and spans between the two rocker panels 5. The vehicle interior floor 1 is formed with a floor tunnel portion 10 extending in the vehicle front-rear direction at the center in the vehicle width direction and projecting toward the vehicle compartment side in a substantially convex shape in cross section. It is formed in a substantially flat shape.

On the upper surface of the passenger compartment floor 1, a floor cross having a substantially hat-shaped cross section that extends in the vehicle width direction between the floor tunnel portion 10 and the left and right rocker panels 5 and forms a closed cross section with the upper surface of the passenger compartment floor 1. A plurality of members 6 are provided. In addition, a plurality of floor members 7 having a substantially inverted hat shape are provided on the lower surface side of the passenger compartment floor 1 so as to extend in the vehicle front-rear direction and form a closed cross section with the floor lower surface. On the passenger compartment floor 1, a driver seat 2 </ b> A and a passenger seat 2 </ b> B are mounted side by side in the left and right positions at approximately the distance of the floor tunnel portion 10, respectively, on the general portions on both sides of the floor tunnel portion 10. . A rigid member 3 is provided between the left and right front seats 2A and 2B so as to transmit a collision load between the two seats 2A and 2B at the time of a vehicle side collision or the like.

As shown in FIGS. 1 to 4, the rigid member 3 is a processed product made of a metal plate having a thickness of about 1.6 to 2 mm, and has a rectangular bottom wall portion that is long in the front-rear direction and four sides of the bottom wall portion. It is a box-shaped hollow rectangular parallelepiped with left and right side walls standing from the edge, front and rear end walls, and an upper wall that closes the top, and its height is larger than the left and right width along the vehicle width direction. It is set small. Inside the rigid member 3, a plurality of reinforcing plates 30 (three in the illustrated example) are provided at predetermined intervals, extending between the left and right side wall portions and partitioning the internal space in the front-rear direction. Each reinforcing plate 30 is welded and joined to the inner surfaces of the left and right side wall portions by bending flanges formed at the left and right side edges. Note that the two front and rear reinforcing plates 30 are spanned between the inner surfaces of the left and right side walls so that the plate surfaces are slightly inclined backward, and the intermediate reinforcing plates 30 are slightly inclined forward. The rigid member 3 configured as described above has a mass of about 2 to 3 kg.

  Each of the left and right seats 2A, 2B is provided with a metal seat back frame 22 in the seat back 21, and the seat back frame 22 extends in the vehicle width direction along the lower edge of the seat back 21. A reinforcing member 23 made of an extending metal pipe material is laterally provided. And in the position corresponding to the reinforcing member 23 of each seat back 21 of both the seats 2A, 2B, the above-mentioned between the lower end portions of the side surfaces on the vehicle inner side of the seat back 23 facing each other in the vehicle width direction. A rigid member 3 is installed.

  The rigid member 3 is supported on the upper surface of the floor tunnel portion 10 by upright support legs 4A and 4B on both the left and right sides as a support portion so as to be at a height position corresponding to the reinforcing member 23 of each seat back 21. Yes. Each support leg 4A, 4B is comprised with the metal plate which has predetermined length in the front-back direction, and thickness is about 1.6-2 mm.

  The support leg 4 </ b> A on the driver seat 2 </ b> A side is formed so that its front-rear width is substantially the same as or slightly larger than the front-rear length of the rigid member 3. The support leg 4A is welded and joined by overlapping a horizontal coupling flange 40 bent at the upper edge thereof at a position near one side edge of the bottom surface of the bottom wall portion of the rigid member 3, and the support leg 4A is substantially vertically downward. It is extended to.

  The front and rear width of the support leg 4B on the passenger seat 2B side is shorter than that of the support leg 4A on the driver seat 2A side, and is approximately one half to two thirds of the front and rear length of the rigid member 3. It is formed. The support leg 4 </ b> B has a joint flange 40 at the upper edge welded to a position near the rear half of the other side edge of the bottom surface of the bottom wall of the rigid member 3. Both support legs 4A and 4B are set such that the support rigidity for supporting the rigid member 3 is asymmetric due to the difference in the front and rear width.

  The rigid member 3 is disposed such that the outer side surfaces of the left and right side wall portions thereof are closely opposed to the lower end portions of the side surfaces of the seat backs 21 facing each other of the left and right seats 2A and 2B. A substantially horizontal fastening flange 41 bent at the lower edge of the support leg 4A on the driver's seat side is overlapped with a position near the side edge on the driver's seat side on the upper surface of the floor tunnel portion 10, and the front end and the rear of the fastening flange 41 are placed. The bolts are fastened and fixed by bolts through bolt through holes formed at three ends in the front and rear direction, and the fastening flange 41 on the lower edge of the support leg 4B on the passenger seat side is fixed on the passenger seat side on the upper surface of the floor tunnel portion 10. The two front and rear ends of the fastening flange 41 are fastened and fixed with bolts so as to overlap with the positions near the side edges. Although not shown, the rigid member 3 is covered with a synthetic resin console member installed between the driver's seat 2A and the passenger seat 2B.

  Next, the operation of the rigid member 3 will be described. For example, when a side collision occurs on the door D1 that is the side wall of the vehicle body on the driver's seat 2A side and a collision load acts from the door D1 side toward the inside of the vehicle, the driver's seat where the collision load is aligned substantially in a straight line in the vehicle width direction. Transmission from the reinforcing member 23 of the seat back 21 of the 2A to the rigid member 3, from the rigid member 3 to the reinforcing member 23 of the passenger seat 2B, and from the reinforcing member 23 of the passenger seat 2B to the door D2 that is the side wall of the passenger seat In this process, the load is dispersed, the deformation of the passenger compartment is suppressed as much as possible, and the passenger compartment space can be sufficiently secured.

  On the other hand, the dynamic damper having the rigid member 3 as a mass body controls the vibration of the passenger compartment floor 1. When the engine rotates at a medium to high speed, the engine vibration is transmitted to the passenger compartment floor 1, and when the passenger compartment floor 1 resonates in the frequency range of 140 to 160 Hz, the vehicle interior noise is amplified, giving the passenger an unpleasant feeling.

  In this case, the rigid member 3 supported on the passenger compartment floor 1 by the support legs 4A and 4B becomes a dynamic damper, and the resonance frequency range of the passenger compartment floor 1 can be removed (shifted) from the region of 140 to 160 Hz. The sound level of unpleasant in-car noise can be reduced. The transition of the resonance frequency range of the passenger compartment floor 1 can be made by adjusting the mass of the rigid member 3 and the support rigidity (spring constant) of the support legs 4A and 4B.

  According to the present embodiment, in order to suppress the resonance of the passenger compartment floor 1 in which unpleasant in-vehicle noise is amplified, the vehicle body frame parts such as the floor cross member and the floor member are added as in the conventional vibration countermeasures. Without installing a dynamic damper on the engine mount of the engine, the rigid member 3 provided on the passenger compartment floor 1 for the purpose of securing the passenger compartment space at the time of a side collision can be changed without impairing the original function of the rigid member 3. Since it has a role of a damper, it can be constructed economically without increasing the weight of the vehicle body or increasing the cost, and can effectively suppress unpleasant in-car interior noise amplification.

  The rigid member 3 having the function of the mass body of the dynamic damper can be easily set to a predetermined mass by increasing or decreasing the number of reinforcing plates 30 provided inside. Further, the rigid plate 3 is not crushed and deformed by a collision load at the time of a side collision by the reinforcing plate 30, and the collision load can be transmitted efficiently.

  The support legs 4A and 4B that support the rigid member 3 are not particularly required to be strong, and need only be able to hold the rigid member 3 at a predetermined height position between both sheets 2A and 2B, and are easily bent from a metal plate. Is enough. Further, since both the support legs 4A and 4B are provided in the front-rear direction, the rigid member 3 can be easily vibrated in the vehicle width direction by engine vibration. Further, since the support legs 4A and 4B have their support rigidity set asymmetric by changing their front-rear width, the rigid member 3 can be made to vibrate more easily. As described above, since the rigid member 3 is easily vibrated, the resonance frequency range of the passenger compartment floor due to engine vibration can be easily removed from the frequency range where unpleasant in-car noise is amplified. In addition, as a mode of setting the support rigidity of each support leg asymmetrically, not only the setting of the outer width dimension, but also the number of fastening points of each support leg to the passenger compartment floor can be set to a different number, Openings of different sizes may be formed in the middle part of the.

FIG. 3 shows a passenger compartment floor of the automobile according to the present invention, and is a cross-sectional view taken along a line II in FIG. 2. It is the schematic which shows the motor vehicle provided with the rigid member which suppresses a deformation | transformation of a compartment at the time of a side collision with a compartment floor. It is a perspective view of a rigid member to which the present invention is applied. It is a top view of the said rigid member. It is a schematic sectional drawing which shows the vibration state of the conventional vehicle interior floor.

Explanation of symbols

1 Car floor 2A, 2B Seat 3 Rigid member 30 Reinforcement plate 4A, 4B Support leg (support part)
D1, D2 Door (Body side wall)

Claims (1)

A collision load acting on the side wall of the vehicle, such as one door, is transmitted between the left and right seats mounted on the passenger compartment floor of the vehicle to the other vehicle body side wall together with the two seats. A box-shaped rigid member is provided,
The rigid member is provided with a plurality of reinforcing plates that span between the left and right side surfaces and set to a predetermined mass, and the left and right side surfaces are opposed to the opposing surfaces of the two sheets.
The rigid member stands up on the passenger compartment floor and is supported by at least a pair of plate-like support portions facing each other at an interval in the left-right direction to constitute a dynamic damper,
The vehicle interior floor of the automobile, wherein the front and rear widths of the two support portions are set to different widths and the rigid members are supported with different support rigidity .