JP2017114205A - Vehicle body support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve NVH performance while suppressing cost.SOLUTION: This support structure supports a body 2 on a frame 4 provided to a vehicle so as to extend in a cross direction via an anti-vibration member 10 is provided with: a bracket 6; and the anti-vibration member 10. The bracket 6 has an upper surface part 6a opposed to the lower surface 2a of the body 2, and is fixed to the frame 4. The anti-vibration member 10 has: an upper mount 11 arranged between the upper surface part 6a of the bracket 6 and the lower surface 2b of the body 2; an upper plate 13 bonded to the upper surface 11a of the upper mount 11 and brought into contact with the lower surface 2b of the body 2. The upper plate 13 is formed into a reverse dish shape separated more from the lower surface 2b toward the radial outside from a bottom surface part 13a brought into contact with the lower surface 2b of the body 2.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a support structure for supporting a body via a vibration isolating member on a frame extending in the front-rear direction of the vehicle.

  As one of vehicle body structures, a structure is known in which a body is supported above a chassis frame via a mount (vibration isolation member). In this structure, the mount is arranged between the bracket fixed to the chassis frame and the lower surface of the body, and the bolt that penetrates the mount from the upper surface of the body is fastened to the nut below the bracket, so that the chassis frame and the body are (See, for example, Patent Documents 1 and 2).

  Generally, the mount is provided so as to come into contact with the body in a plane so that a load inputted from below does not act locally. That is, a flat portion is formed on the body side, and the mount is placed in contact with the flat portion. Furthermore, in order to disperse input (load) from below and transmit it to the body, a structure in which a flat plate is interposed on the upper surface of the mount is also known. Further, the larger the rubber capacity of the mount, the higher the absorption performance (NVH (Noise-Vibration-Harshness) performance) such as road noise and vibration. Therefore, an appropriate rubber capacity is set for each vehicle type.

Japanese Patent Laid-Open No. 11-059483 JP 2008-094135 A

  However, when there is a shape restriction on the body side, an appropriate plane portion corresponding to the size and shape of the mount cannot be formed, and a desired rubber capacity may not be ensured. For example, when using a body that is common to multiple vehicle types, because the body has irregularities and holes that are not necessary for a certain vehicle type, the size and shape of the flat part is changed to match the mount. There are times when you can't. In other words, when trying to share the body among a plurality of vehicle types, the rubber capacity of the mount may not be increased, and road noise and vibration may not be properly absorbed. On the other hand, since the body is a large part, changing it to a shape that matches the mount leads to an increase in cost, so it cannot be said to be a preferable measure.

  The present invention has been devised in view of such problems, and an object thereof is to provide a vehicle body support structure that improves NVH performance while suppressing costs. The present invention is not limited to this purpose, and is a function and effect derived from each configuration shown in the embodiment for carrying out the invention described later, and has another function and effect that cannot be obtained by conventional techniques. is there.

  (1) The vehicle body support structure disclosed herein is an upper surface portion that is disposed opposite to the lower surface of the body in a support structure that supports the body via a vibration isolation member in a frame extending in the front-rear direction of the vehicle. A bracket fixed to the frame, an upper mount disposed between the upper surface portion of the bracket and the lower surface of the body, and bonded to the upper surface of the upper mount to contact the lower surface of the body An anti-vibration member having an upper plate disposed in contact with the upper plate, wherein the upper plate is formed in an inverted dish shape that is separated from the lower surface as it goes radially outward from a bottom surface portion that contacts the lower surface of the body. It is characterized by that.

(2) It is preferable that the body has a flat surface portion with which the bottom surface portion of the upper plate abuts and a bead that is provided in the vicinity of the flat surface portion and bulges downward.
(3) The bead has an inclined portion inclined obliquely downward with respect to the flat surface portion, and the upper plate has an inclined surface portion inclined obliquely downward from the bottom surface portion, and the inclination with respect to the bottom surface portion. It is preferable that the angle of the surface part is formed to be larger than the angle of the inclined part with respect to the flat part.
(4) It is preferable that the upper plate is provided so as not to overlap the bead in the vertical direction.

  (5) The bracket includes a hole portion formed in the upper surface portion, and an inner wall portion extending downward from a peripheral edge of the hole portion, and the vibration isolation member is a lower portion of the upper mount. An inner plate built in the lower mount, and a lower mount that sandwiches the upper surface portion of the bracket together with the upper mount below the upper mount, and the upper mount and the hole portion of the bracket together with the inner plate. It is preferable that the lower mount is in contact with the inner surface of the inner wall portion and the outer mount is in contact with the outer surface of the inner wall portion so as to sandwich the inner wall portion together with the upper mount.

  By forming the upper plate in an inverted dish shape, the rubber capacity of the upper mount can be increased even if the area of the bottom surface on the bottom side where the bottom surface of the upper plate abuts is small. That is, since it can be made difficult to be restricted by the shape of the body, it is possible to use a common body for a plurality of vehicle types, and the cost can be suppressed. In addition, NVH performance can be improved by increasing the rubber capacity.

  Furthermore, by bonding the upper plate to the upper mount and integrating it, the mutual displacement between the upper mount and the upper plate is regulated, and the amount of deformation outward in the radial direction when the upper mount is compressed and deformed Therefore, the upper mount can be expanded to the limit of the outer peripheral end of the upper plate. Thereby, since the rubber capacity can be further increased, the NVH performance can be further enhanced.

1 is a schematic top view of a vehicle to which a body support structure according to an embodiment is applied. It is the expansion perspective view which looked at the A section of FIG. 1 from the downward direction. It is BB arrow sectional drawing of FIG. It is the C section enlarged view of FIG.

  A vehicle body support structure as an embodiment will be described with reference to the drawings. Each embodiment shown below is only an example, and there is no intention of excluding various modifications and application of technology that are not clearly shown in each of the following embodiments. Each configuration of the present embodiment can be implemented with various modifications without departing from the spirit thereof. Further, they can be selected as necessary, or can be appropriately combined.

[1. Constitution]
FIG. 1 is a schematic top view showing a body 2 of a vehicle 1 to which the support structure of this embodiment is applied. The vehicle 1 has a vehicle body structure in which a body 2 (floor panel) is disposed above a chassis frame 3. The chassis frame 3 is a skeleton member that includes a pair of left and right side frames 4 (frames) extending in the vehicle front-rear direction and a plurality of cross members 5 that connect the side frames 4. The body 2 is supported by the side frame 4 via a plurality of vibration isolation members 10.

  In the vehicle 1 of the present embodiment, the vibration isolation members 10 are provided on the front and rear of the left and right front wheels 8 and on the front and rear of the left and right rear wheels 9 (that is, eight locations). In the following description, the vibration isolating member 10 (A portion in FIG. 1) provided behind the left rear wheel 9 will be described as an example. As shown in FIG. 2, the body 2 of the present embodiment has a flat planar portion 20 extending in the horizontal direction at a position in contact with the vibration isolation member 10 behind the rear wheel 9. In addition, two beads 21 that extend in the vehicle front-rear direction and bulge downward are provided in front of and behind the flat portion 20. Each bead 21 is provided at a position close to the flat surface portion 20, and has an inclined portion 21 e inclined obliquely downward with respect to the flat surface portion 20. The inclined portion 21e of the present embodiment is formed in a planar shape.

  The body support structure of the present embodiment includes a bracket 6 fixed to the side frame 4 and a vibration isolating member 10 that absorbs road noise and vibration. As shown in FIGS. 2 and 3, the bracket 6 is a plate-like member that is fixed to the outer side surface 4d of the side frame 4 and protrudes outward from the outer side surface 4d. The bracket 6 integrally includes an upper surface portion 6a, an inner wall portion 6c, an outer wall portion 6d, and a flange portion 6f.

  The upper surface portion 6a is a planar portion disposed opposite to the lower surface 2b of the body 2, and mounts 11 and 12 described later are attached thereto. A circular hole 6h through which the bolt 16 is inserted is provided substantially through the center of the upper surface portion 6a. The inner wall portion 6c is a portion that is bent downward from the periphery of the hole 6h in the upper surface portion 6a, and is suspended from the periphery of the hole 6h. The inner wall 6c has a function of regulating displacement (positional deviation) of the mounts 11 and 12 with respect to the bracket 6. The outer wall portion 6d is a portion that hangs downward from the periphery of the upper surface portion 6a, and its height dimension (vertical length) is larger than that of the inner wall portion 6c. The outer wall portion 6d has a function of restricting a deformation amount that bulges outward in the radial direction when a lower mount 12 described later is compressed and deformed. The flange portion 6f is a portion that is provided on the innermost side of the bracket 6 and fixed to the outer surface 4d of the side frame 4. The flange portion 6f is provided as a plane along the outer side surface 4d, and in the present embodiment, has a U-shape with the lower part opened in a side view.

  The anti-vibration member 10 includes two mounts 11 and 12, three plates 13, 14, and 15 and fastening parts (bolts 16, nuts 17, spacers 18, and washers 19) for connecting them. The mounts 11 and 12 are rubber elastic parts that absorb road noise, vibration, and the like during vehicle travel, and are provided coaxially in the vertical direction. A through hole through which the bolt 16 and the spacer 18 are inserted is formed at the center of the mounts 11 and 12.

  The upper mount 11 (hereinafter referred to as “upper mount 11”) is disposed between the upper surface portion 6 a of the bracket 6 and the lower surface 2 b of the body 2. On the other hand, the lower mount 12 (hereinafter referred to as “lower mount 12”) holds the upper surface portion 6 a of the bracket 6 together with the upper mount 11 below the upper mount 11. That is, the lower mount 12 is disposed below the bracket 6.

  An upper plate 13 is vulcanized and bonded to the upper surface 11 a of the upper mount 11 and is provided integrally with the upper mount 11. The upper plate 13 is a plate-like member disposed in contact with the lower surface 2b of the body 2, and has a function of defining the shape of the upper mount 11 and a function of distributing input (load) from below to the body 2 Together. The upper plate 13 has a circular bottom surface portion 13a that comes into contact with the lower surface 2b, and is formed in a shape that is separated from the lower surface 2b as it goes radially outward from the bottom surface portion 13a. When viewed from the direction perpendicular to the axial direction of the bolt 16, the overall shape of the upper plate 13 can be similar to an inverted dish shape in which a shallow flat dish is turned upside down. The bottom surface portion 13 a has a diameter shorter than the length in the front-rear direction of the flat surface portion 20 provided between the two beads 21.

  The upper plate 13 has an inclined surface portion 13e inclined obliquely downward from the bottom surface portion 13a. The inclined surface part 13e of this embodiment is provided substantially parallel to the inclined part 21e of the bead 21 formed in the body 2, as shown in FIGS. That is, the angle α of the inclined surface portion 13e with respect to the bottom surface portion 13a is formed substantially the same as the angle β of the inclined portion 21e of the bead 21 with respect to the flat surface portion 20. Thereby, a fixed gap D is formed between the inclined surface portion 13e and the inclined portion 21e of the upper plate 13. Note that the magnitude relationship between the angle α and the angle β is not limited to this, and for example, the angle α may be larger than the angle β. Even in this case, it is preferable that a gap is formed between the inclined surface portion 13e and the inclined portion 21e.

  The upper plate 13 is provided with an outer peripheral end portion 13d on the radially outer side of the inclined surface portion 13e substantially parallel to the bottom surface portion 13a. The upper plate 13 is provided so as not to overlap the bead 21 in the vertical direction. That is, the upper plate 13 is formed in such a size that the outer peripheral end portion 13d is not located directly under the bulged lower surface of the bead 21. Since the upper mount 11 and the upper plate 13 are vulcanized and bonded, the upper surface 11a of the upper mount 11 has a shape corresponding to the shape of the upper plate 13 so that no gap is formed between the upper mount 11 and the upper plate 13. Become.

  An inner plate 14 is built in the lower part of the upper mount 11. The inner plate 14 has both a function of restricting the amount of deformation that expands radially outward when the upper mount 11 is compressed and deformed, and a function of reinforcing the upper mount 11. The inner plate 14 is formed by bending downward from the first surface portion 14a along the upper surface portion 6a of the bracket 6 to the second surface portion 14b inclined upward in the radial direction and radially inward of the first surface portion 14a. And a cylindrical portion 14c. The 2nd surface part 14b is a site | part which controls so that it may not spread outside when the upper mount 11 is compressively deformed. The cylindrical portion 14 c is a portion that enters the hole 6 h of the bracket 6 and regulates the shape of the upper mount 11. That is, the lower end of the upper mount 11 is inserted into the hole 6 h together with the inner plate 14 and comes into contact with the inner surface of the inner wall 6 c of the bracket 6.

  The lower mount 12 has an upper surface 12 a in contact with the lower surface of the upper surface portion 6 a of the bracket 6, and sandwiches the upper surface portion 6 a with the lower surface of the upper mount 11. The upper surface 12a of the lower mount 12 is formed in a concave shape with a central portion cut out downward. The inner wall 6c of the bracket 6 contacts the inner peripheral surface 12c of the recess 12r. In other words, the lower mount 12 contacts the outer surface of the inner wall portion 6 c of the bracket 6 and sandwiches the inner wall portion 6 c together with the upper mount 11.

  A lower plate 15 provided separately from the lower mount 12 is disposed in contact with the lower surface 12 b of the lower mount 12. A spacer 18 extending in the axial direction is disposed between the upper plate 13 and the lower plate 15. The spacer 18 is a pipe-like component and has a function of keeping the distance between the upper plate 13 and the lower plate 15 constant. The bolt 16 is inserted from above the body 2 and is inserted into the spacer 18, and is screwed to the nut 17 below the lower plate 15, whereby the body 2 and the side frame 4 are connected to the vibration isolating member 10. It is attached via. The washer 19 is disposed on the upper surface side of the body 2 and is fastened to the body 2 by a bolt 16.

[2. Action, effect]
(1) In the above-described support structure, the vibration isolating member 10 provided between the side frame 4 and the body 2 is bonded to and integrated with the upper mount 11 that is an elastic component and the upper surface 11a. And have. Since the upper plate 13 is formed in an inverted dish shape, even if the area of the lower surface 2b of the bottom 2 where the bottom surface portion 13a of the upper plate 13 abuts is small, the upper mount 11 extends along the inclined surface portion 13e. It can be expanded to the outer peripheral end 13d, and the rubber capacity can be increased. That is, since it can be made difficult to be restricted by the shape of the body 2, for example, it becomes possible to use the common body 2 in a plurality of vehicle types, and the cost can be suppressed. Further, by increasing the rubber capacity, it is possible to improve the vibration absorption performance and road noise absorption performance (NVH performance) by the vibration isolation member 10.

  Further, the above-described vibration isolating member 10 is molded as an integral body by bonding the upper plate 13 to the upper mount 11. For this reason, mutual displacement between the upper mount 11 and the upper plate 13 is restricted, and the amount of deformation outward in the radial direction when the upper mount 13 is compressed and deformed is suppressed. The upper mount 11 can be expanded to the limit of the portion 13d. Thereby, since the rubber capacity can be further increased, the NVH performance can be further enhanced.

  (2) Since the above-described body 2 is provided with the two beads 21 in the vicinity of the flat surface portion 20 with which the bottom surface portion 13a of the upper plate 13 abuts, the rigidity of the body 2 can be increased. Further, in the case of the vibration isolating member 10 described above, even if an uneven shape such as the bead 21 is provided around the flat surface portion 20 as in the above-described body 2, the rubber capacity of the upper mount 11 is increased. Therefore, the rigidity of the body 2 can be increased while improving the NVH performance.

  (3) The above-described upper plate 13 is formed so that the angle α of the inclined surface portion 13e with respect to the bottom surface portion 13a is substantially the same as the angle β of the inclined portion 21e of the bead 21 with respect to the flat surface portion 20. By setting the angle α to a size equal to or larger than the angle β (α ≧ β), the gap D can be secured at the maximum between the upper mount 11 and the bead 21, and local to the upper mount 11. It can suppress that a load acts and can improve durability of vibration isolator 10. That is, as the angle α is smaller (closer to a right angle), there is a problem that a local load is more likely to act on the corner portion formed by the bottom surface portion 13a and the inclined surface portion 13e when the upper mount 11 is compressed and deformed. However, by setting α ≧ β as described above, it is possible to obtain a shape in which a local load is difficult to act while ensuring a gap. Furthermore, since the rubber capacity can be increased as the angle α is larger, the NVH performance can be improved.

  Further, by making the angle α substantially the same as the angle β, a certain gap D is ensured between the upper plate 13 and the lower surface 2b of the body 2 even if the bottom surface portion 13a is set to a marginal size of the flat surface portion 20. can do. That is, in addition to the fact that the size of the bottom surface portion 13a of the upper plate 13 can be set large, the area of the upper surface of the upper mount 11 can be set large by using the inclined surface portion 13e. The rubber capacity can be increased. Thereby, NVH performance can be further improved.

  (4) Since the above-described upper plate 13 is provided so as not to overlap the bead 21 in the vertical direction, even if the upper plate 13 is temporarily deformed due to compression deformation of the upper mount 11, the upper plate 13 and the body 2 Contact can be avoided. Thereby, durability of the vibration isolator 10 can be improved.

  (5) Further, in the above-described vibration isolating member 10, the upper mount 11 is reinforced by the inner plate 14 built in the lower portion of the upper mount 11, and the deformation amount when the upper mount 11 is compressed and deformed is regulated. . Further, the upper mount 11 is inserted into the hole 6 h of the bracket 6 together with the inner plate 14 and comes into contact with the inner surface of the inner wall 6 c. On the other hand, the lower mount 12 disposed below the upper mount 11 contacts the outer surface of the inner wall portion 6 c of the bracket 6 and sandwiches the inner wall portion 6 c together with the upper mount 11. For this reason, the displacement of the mounts 11 and 12 with respect to the bracket 6 fixed to the side frame 4 and the body 2 can be restricted, and the positions of these mounts 11 and 12 can be stabilized. Thereby, the NVH performance of the vibration isolator 10 can be further improved.

[3. Modified example]
The configurations of the body 2, the bracket 6 and the vibration isolation member 10 described above are examples, and are not limited to those described above. For example, the inclined portion 21e of the bead 21 of the body 2 may be a curved surface instead of a flat shape. In this case, the angle α between the tangent line of the inclined portion 21e at the position closest to the upper plate 13 and the plane portion 20 may be set as the angle β, and the angle α of the upper plate 13 may be set. Further, the body 2 may not have the beads 21.

The bracket 6 may have a shape having at least an upper surface portion 6a and a flange portion 6f, and the inner wall portion 6c and the outer wall portion 6d may be omitted.
Further, the vibration isolator 10 may be any member as long as at least the upper mount 11 and the upper plate 13 are integrally provided. For example, the anti-vibration member 10 may not have the lower mount 12 and the lower plate 15. Further, the inner plate 14 may be provided separately from the upper mount 11, or the inner plate may be provided on the lower mount 12.

The shape of the upper plate 13 may be an inverted dish shape that is separated from the lower surface 2b as it goes radially outward from the bottom surface portion 13a. May be. A part of the upper plate 13 may overlap the bead 21 in the vertical direction.
In the above-described embodiment, the anti-vibration member 10 (A portion in FIG. 1) provided behind the left rear wheel 9 is illustrated, but the anti-vibration member 10 provided at other positions is similar to that described above. It is good also as a structure of. The above-described vibration isolation member 10 may be disposed in any part of the vehicle body.

1 vehicle 2 body 2b bottom surface 4 side frame (frame)
6 Bracket 6a Upper surface portion 6c Inner wall portion 6h Hole portion 10 Vibration isolating member 11 Upper mount 11a Upper surface 12 Lower mount 13 Upper plate 13a Bottom surface portion 13e Inclined surface portion 14 Inner plate 20 Flat surface portion 21 Bead 21e Inclined portion

Claims (5)

In a support structure for supporting a body via a vibration isolating member on a frame extending in the longitudinal direction of the vehicle,
A bracket fixed to the frame, having an upper surface disposed opposite to the lower surface of the body;
The anti-vibration comprising: an upper mount disposed between the upper surface portion of the bracket and the lower surface of the body; and an upper plate adhered to the upper surface of the upper mount and disposed in contact with the lower surface of the body A member, and
The vehicle body support structure according to claim 1, wherein the upper plate is formed in an inverted dish shape that is separated from the lower surface as it goes radially outward from a bottom surface portion that contacts the lower surface of the body. The said body has the plane part which the said bottom face part of the said upper plate contact | abuts, and the bead which was provided in the vicinity of the said plane part, and was bulged and formed in the downward direction, It is characterized by the above-mentioned. Vehicle body support structure. The bead has an inclined portion inclined obliquely downward with respect to the flat surface portion,
The upper plate has an inclined surface portion inclined obliquely downward from the bottom surface portion, and an angle of the inclined surface portion with respect to the bottom surface portion is formed to be larger than an angle of the inclined portion with respect to the flat surface portion. The vehicle body support structure according to claim 2, wherein the vehicle body support structure is a vehicle. The vehicle body support structure according to claim 2, wherein the upper plate is provided so as not to overlap the bead in the vertical direction. The bracket has a hole portion drilled in the upper surface portion, and an inner wall portion suspended downward from the periphery of the hole portion,
The vibration-proof member has an inner plate built in a lower portion of the upper mount, and a lower mount that sandwiches the upper surface portion of the bracket together with the upper mount below the upper mount,
The upper mount is inserted into the hole portion of the bracket together with the inner plate and comes into contact with the inner surface of the inner wall portion,
5. The vehicle body support structure according to claim 1, wherein the lower mount is in contact with an outer surface of the inner wall portion and sandwiches the inner wall portion together with the upper mount.

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