JP2020029144A - Rubber structure of damper top mount - Google Patents

Abstract

To provide a rubber structure of a damper top mount, which can prevent abnormal noise from being generated and inhibit the height of an engine hood from being increased in a compatible manner.SOLUTION: An attachment bracket 122 disposed on an upper end of a damper is fixed from a lower side to a damper attachment surface disposed on an upper end of a suspension tower. The attachment bracket 122 is fixed to the damper attachment surface at fastening points P1, P2 and P3 with plural bolts 131, 132 and 133 and nuts. The plural fastening points P1, P2 and P3 are arranged circumferentially around a damper axis AX so as to be separated from each other. Plural elastic portions 123a, 123b and 123c made of rubber are disposed between the adjacent fastening points while being interposed and compressed between the attachment bracket 122 and the damper attachment surface. The elastic portion 123a located at the outermost side in the vehicle width direction has an area greater than areas of the other elastic portions 123b and 123c.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a rubber structure of a damper top mount of a suspension for suspending a wheel.

  Patent Literature 1 discloses a mounting structure of a damper of a strut type suspension of a vehicle.

JP-A-63-31512

  At the upper end of a damper such as a strut type suspension, a mounting bracket is generally provided which is fixed from below to a damper mounting surface provided at an upper end of a suspension tower of a vehicle body by using, for example, a plurality of bolts and nuts. ing.

  While the vehicle is running, a force such as a torsional force according to the behavior of the wheel is applied to the damper mounting surface of the suspension tower and the mounting bracket of the damper. At this time, the damper mounting surface and the mounting bracket may be slightly deformed around the fastening point by the bolt and the nut, and may repeatedly contact, slide, and separate, thereby generating abnormal noise.

  As a countermeasure, rubber may be interposed between the damper mounting surface of the suspension tower and the mounting bracket of the damper. Thus, even if the damper mounting surface and the mounting bracket are slightly deformed, the rubber suppresses the contact between the damper mounting surface and the mounting bracket, thereby suppressing generation of abnormal noise.

  For example, conventionally, a step-up portion is provided on the mounting bracket of the damper top mount, and a sheet-like rubber having a thickness lower than the height of the step-up portion is arranged in a portion other than the step-up portion on the upper surface of the mounting bracket. Was.

  However, when the step-up portion is provided, the upper end position of the damper is higher by the height of the step-up portion than when no step-up portion is provided. As a result, the damper mounting surface of the suspension tower is raised to the height of the step-up portion. It is necessary to make it higher. Above the suspension tower, there is a case where a bonnet constituting the upper surface of the front part of the vehicle body is arranged. In this case, the position of the bonnet needs to be increased, and the degree of freedom in vehicle design decreases.

  Here, since the damper of the suspension is arranged in an inclined posture such that the upper end side is located on the inner side in the vehicle width direction as compared with the lower end side, it is necessary to consider the above inclination when examining the upper end position of the damper. .

  An object of the present invention is to achieve both suppression of occurrence of abnormal noise due to the above-described cause and suppression of increase in hood height.

  In order to solve the above problems, a rubber structure of a damper top mount according to the present invention is characterized in that it is configured as follows.

The invention described in claim 1 is
A damper arranged in an inclined position such that the upper end side of the damper shaft is located on the inner side in the vehicle width direction as compared with the lower end side in a front view, and a mounting bracket provided at an upper end of the damper is provided at an upper end of the suspension tower. A rubber structure of a damper top mount fixed from below to the provided damper mounting surface,
The mounting bracket is fixed to the damper mounting surface at a plurality of fastening points by a plurality of fastening members,
The plurality of fastening points are arranged around the damper shaft so as to be separated from each other in a circumferential direction thereof,
A plurality of elastic portions made of rubber in a compressed state sandwiched between the mounting bracket and the damper mounting surface are provided between adjacent fastening points,
The elastic part located on the outermost side in the vehicle width direction has a larger area than the remaining elastic part.

The invention according to claim 2 is the invention according to claim 1,
As the plurality of fastening points,
A first fastening point provided on the outside in the vehicle width direction and on the front side in the vehicle front-rear direction with respect to the damper shaft;
A second fastening point provided on the outside in the vehicle width direction and on the rear side in the vehicle front-rear direction with respect to the damper shaft;
A third fastening point provided substantially at the center between the first fastening point and the second fastening point in the vehicle width direction with respect to the damper shaft and in the vehicle longitudinal direction;
As the plurality of elastic portions,
A first elastic portion provided substantially at the center in the vehicle longitudinal direction between the first fastening point and the second fastening point;
A second elastic portion provided substantially at the center in the vehicle width direction between the first fastening point and the third fastening point;
A third elastic portion provided substantially at the center in the vehicle width direction between the second fastening point and the third fastening point;
The first elastic portion has a larger area than the second elastic portion and the third elastic portion.

The invention according to claim 3 is the invention according to claim 2,
The first elastic portion extends in the vehicle width direction in a belt shape outside the vehicle width direction with respect to the damper shaft,
The second elastic portion extends in the vehicle front-rear direction on the front side with respect to the damper shaft in a belt shape,
The third elastic portion extends in a belt-like shape in the vehicle front-rear direction on the rear side with respect to the damper shaft,
The first elastic portion has a larger band width and a larger area than the second elastic portion and the third elastic portion.

The invention according to claim 4 is the invention according to claim 3,
The first fastening point and the second fastening point are arranged at the same position in the vehicle width direction.

The invention according to claim 5 is the invention according to any one of claims 1 to 4,
Each elastic portion has a first thickness in an uncompressed state,
The area of each elastic part is such that each elastic part has a second thickness smaller than the first thickness in a state where each elastic part is sandwiched between the damper mounting surface and the damper top mount and compressed. In addition, it is characterized by being set in accordance with a compressive load acting on each elastic portion.

The invention according to claim 6 is the invention according to claim 5,
The plurality of fastening members fasten the mounting bracket and the damper mounting surface with a predetermined axial force in a state where they sandwich the plurality of elastic portions,
The second thickness is set to a thickness that does not reduce the axial force of fastening by the plurality of fastening members from the predetermined axial force by a certain amount or more even if the plurality of elastic portions are thinned due to aging. It is characterized by.

The invention according to claim 7 is the invention according to any one of claims 1 to 6,
The plurality of elastic portions are integrally formed in one elastic member.

  According to the first aspect of the present invention, the step-up portion is provided by providing the plurality of elastic portions compressed between the mounting bracket and the damper mounting surface between the adjacent fastening points. The height of the upper end of the damper can be reduced as compared with the case where the elastic portion in the non-compressed state is arranged. Further, since the elastic portion is interposed between the mounting bracket and the damper mounting surface, a gap is formed around the elastic portion between the mounting bracket and the damper mounting surface. As a result, even when vibration occurs during traveling of the vehicle or the like, contact at positions other than the fastening point between the mounting bracket and the damper mounting surface is suppressed, thereby suppressing generation of abnormal noise.

  Here, the damper is generally arranged in an inclined posture such that the upper end side of the damper shaft is located on the inner side in the vehicle width direction as compared with the lower end side when viewed from the front. In such a damper, a larger compressive load acts on the elastic portion located on the outer side in the vehicle width direction than on the elastic portion on the inner side in the vehicle width direction. Assuming that the area of all the elastic portions is the same, the elastic portion on the outer side in the vehicle width direction on which a large compressive load is applied is more compressed. Further, assuming that the thickness of the elastic portion before compression is the same, the thickness of the elastic portion on the outside in the vehicle width direction after compression becomes the smallest. As a result, the gap interval around the elastic portion on the outer side in the vehicle width direction is smaller than the gap interval around the elastic portion on the inner side in the vehicle width direction, and the effect of suppressing contact between the damper mounting surface and the damper top mount can be reduced. There is. That is, the effect of suppressing abnormal noise may be reduced.

  In consideration of this, in the present invention, the elastic portion located on the outer side in the vehicle width direction is made larger in area than the remaining elastic portion, and the load per unit area received by the elastic portion located on the outer side in the vehicle width direction is reduced. Like that. Thereby, it is possible to suppress the elastic portion located outside in the vehicle width direction from being excessively compressed as compared with the remaining elastic portion. Therefore, an appropriate gap can be provided around the elastic portion on the outer side in the vehicle width direction. Therefore, an appropriate gap interval is secured between the damper mounting surface and the damper top mount regardless of the position in the vehicle width direction, so that generation of abnormal noise can be more appropriately suppressed.

  As described above, according to the present invention, it is possible to achieve both suppression of generation of abnormal noise and suppression of increase in hood height.

  According to the second aspect of the invention, when the first to third fastening points are provided around the damper shaft, it is possible to suppress the generation of abnormal noise and the rise of the hood height with a simple structure. Can be compatible.

  According to the third aspect of the present invention, a specific embodiment of the present invention in a case where the first to third fastening points are provided is provided. That is, the first to third elastic portions are formed to extend in a band shape, and the band width and the area of the first elastic portion are made larger than the band width and the area of the second elastic portion and the third elastic portion. Thereby, in the case where the first to third fastening points are provided, it is possible to achieve both the suppression of the generation of abnormal noise and the suppression of the rise of the hood height with a simple structure.

  According to the fourth aspect of the present invention, a specific mode of the present invention in a case where the first to third fastening points are provided is provided. That is, in the vehicle having the first to third fastening points as described above, the first fastening point and the second fastening point are often arranged at the same position in the vehicle width direction. Thus, it is possible to achieve both suppression of generation of abnormal noise and suppression of increase in hood height.

  According to the invention described in claim 5, the area of each elastic portion is such that the thickness of each elastic portion is greater than the first thickness in a state where each elastic portion is sandwiched between the damper mounting surface and the damper top mount and compressed. Is set in accordance with the compressive load acting on each elastic portion so that the second thickness is also small, so that the position between the damper mounting surface and the damper top mount can be increased regardless of the vehicle width direction position. Appropriate clearances can be ensured, so that generation of abnormal noise can be more appropriately suppressed.

  According to the invention as set forth in claim 6, the second thickness is such that the axial force of the fastening by the plurality of fastening members is not reduced from the predetermined axial force by a certain amount or more even if the plurality of elastic portions are thinned due to aging. With this setting, the mounting bracket and the damper mounting surface can be properly fastened to the plurality of elastic portions even if the plurality of elastic portions become thin due to aging.

  According to the invention described in claim 7, a plurality of elastic portions can be collectively attached at once. Therefore, the amount of mounting work can be reduced. Further, the accuracy of the positional relationship between the plurality of elastic portions can be improved.

1 is a side view of a suspension tower in a vehicle to which a rubber structure of a damper top mount according to an embodiment of the present invention is applied. It is sectional drawing by the AA of FIG. It is a top view of a suspension tower. It is a perspective view of a suspension upper part. It is a top view of a damper top mount. It is sectional drawing by CC line of FIG. It is sectional drawing by the BB line of FIG. FIG. 6 is a cross-sectional view (schematic diagram) taken along line DD of FIG. 5. It is a figure equivalent to FIG. 5 about the damper top mount of a 1st modification. It is a figure equivalent to FIG. 5 about the damper top mount of a 2nd modification.

  Hereinafter, a rubber structure of a damper top mount according to an embodiment of the present invention will be described with reference to the accompanying drawings.

(Embodiment 1)
[Constitution]
FIG. 1 is a side view of a suspension tower in a vehicle to which a rubber structure of a damper top mount according to an embodiment of the present invention is applied. FIG. 2 is a sectional view taken along line AA of FIG. FIG. 3 is a plan view of the suspension tower. Since the left and right suspension devices have a symmetrical structure, only the suspension device on the left side of the vehicle will be described below.

  As shown in FIGS. 1, 2, and 3, a wheel house 11 that houses a wheel 90 is provided at a front portion of a vehicle body of the vehicle. An inner end in the vehicle width direction of a sheet metal forming the wheel house 11 is connected to a front frame 14 extending in the vehicle front-rear direction. 13 is connected. A suspension tower 12 is formed above the wheel house 11. The suspension tower 12 includes a suspension tower reinforcement 12A (see FIG. 3) and the like. The upper surface of the front part of the vehicle body is covered with a bonnet 15. The bonnet 15 is inclined so as to become lower toward the front side in the vehicle front-rear direction and lower toward the outside in the vehicle width direction in view of the vehicle body design.

  A suspension device 100 that suspends the wheel 90 is attached to the suspension tower 12.

  The suspension device 100 is a strut type suspension device. The suspension device 100 has a damper 101 and a coil spring 113 externally inserted into the damper 101, and suspends the wheel 90 on the vehicle body by a strut structure including the damper 101 and the coil spring 113.

  The damper 101 includes a cylindrical cylinder 111 filled with oil therein, and a piston rod 112 inserted into the cylinder 111 so as to be able to stroke in the direction of its axis (damper axis AX). The damper 101 is disposed in the wheel house 11 in an inclined position such that the upper end side of the damper shaft AX is located inside the lower end side in the vehicle width direction. A damper top mount 120 is fixed to the upper end of the piston rod 112.

  The damper top mount 120 is fixed to the damper mounting surface 12a of the suspension tower 12 using a plurality of bolts 131, 132, 133 and nuts 141, 142, 143. The front end of the bolt 131 on the outer side and the front side in the vehicle width direction is close to the lower surface of the bonnet 15 because the bonnet 15 is inclined as described above.

  At the lower end of the piston rod 112, a piston 112b slidably disposed in the cylinder 111 is attached. An orifice hole (not shown) through which the fluid in the cylinder 111 flows is formed in the piston 112b.

  A wheel hub 103 is connected to a lower end of the cylinder 111 via a knuckle 102. The wheel hub 103 is rotatably supported on the knuckle 102 via a hub bearing (not shown), and the wheel 90 is attached to the wheel hub 103.

  The coil spring 113 is a compression coil spring formed by forming a wire into a spiral shape (coil shape), and is disposed substantially on the same axis as the piston rod 112.

  Below the damper top mount 120, an upper spring seat member 114 that supports the upper end of the coil spring 113 with the annular rubber member 116 interposed therebetween is provided.

  A lower spring seat member 115 that supports the lower end of the coil spring 113 is attached to the upper end of the cylinder 111.

  The upper spring seat member 114 is provided so that the seat surface is parallel to a plane perpendicular to the damper axis AX, while the lower spring seat member 115 is seated against a plane perpendicular to the damper axis AX. The surface is inclined so as to be lower inside the vehicle width direction and higher outside the vehicle width direction. As a result, the coil spring 113 is more compressed on the outside in the vehicle width direction than on the inside in the vehicle width direction. The reason why the coil spring 113 is brought into such a compressed state is as follows. That is, as described above, since the upper end side of the damper shaft AX is arranged in an inclined posture such that the upper end side is located on the inner side in the vehicle width direction as compared with the lower end side, the left and right damper shafts AX are formed in a C-shape in a front view of the vehicle. Become. Therefore, due to the vehicle's own weight and vertical vibration during traveling, a force is likely to be applied to the cylinder 111 and the piston rod 112 so as to bend them inwardly in the vehicle width direction in a “<” shape. In order to suppress such bending deformation, the coil spring 113 is compressed more on the outer side in the vehicle width direction than on the inner side in the vehicle width direction, and a force for canceling the bending deformation is generated. Things.

  Between the upper spring seat member 114 and the lower spring seat member 115, a telescopic cover 118 that covers the piston rod 112 from the outer peripheral side is provided on the inner peripheral side of the coil spring 113. The telescopic cover 118 expands and contracts according to the vertical movement of the piston rod 112 with respect to the cylinder 111.

  A bump stopper 117 for limiting the magnitude of the vertical movement of the piston rod 112 to a certain value or less is externally inserted on the upper end side of the piston rod 112 (see FIG. 7). The bump stopper 117 is attached to a lower part of the damper top mount 120.

  Next, the structure and the like of the damper top mount 120 will be described with reference to FIGS.

  FIG. 4 is a perspective view of the upper part of the suspension. FIG. 5 is a plan view of the damper top mount. FIG. 6 is a sectional view taken along line CC of FIG. FIG. 7 is a sectional view taken along line BB of FIG. FIG. 8 is a cross-sectional view (schematic diagram) taken along line DD of FIG.

  As shown in FIGS. 4 to 7, the damper top mount 120 is an assembly body including a plurality of metal members and rubber members.

  The damper top mount 120 includes a metal rod bracket 121 fixed to the piston rod 112, a metal mounting bracket 122 fixed to the damper mounting surface 12a of the suspension tower 12, a metal inner pipe 124, a rubber And an elastic member 123 made of.

  As shown in FIG. 6, the rod bracket 121 includes an upper member 121A having an inverted hat shape, and an inverted dish-shaped lower member 121B attached to a lower portion of the upper member 121A. At the center of the rod bracket 121, there is provided a screw hole 121a through which a screw portion 112a at the upper end of the piston rod 112 is inserted, and a nut 151 is screwed into the screw portion 112a. Thus, the rod bracket 121 is fixed to the piston rod 112.

  The mounting bracket 122 is arranged on the outer peripheral side of the cylindrical portion 121b of the rod bracket 121. The mounting bracket 122 includes an upper plate 122A and a lower plate 122B joined to a lower surface of the upper plate 122A.

  The inner pipe 124 has a cylindrical shape, and is press-fitted into the cylindrical portion 121b of the upper member 121A of the rod bracket 121.

  The elastic member 123 uses a metal mold or the like to apply rubber to the mounting bracket 122 and the metal inner pipe 124 that is disposed on the inner peripheral side and is fitted to the upper member 121A of the rod bracket 121. It is formed by sulfuric acid.

  As shown in FIGS. 4 to 7, a plurality of bolts 131, 132, and 133 are inserted into and fixed to the mounting bracket 122 from the lower surface side. The bolts 131, 132, 133 are for fixing the damper top mount 120 to the damper mounting surface 12a of the suspension tower 12, and nuts 141, 142, 143 are screwed therein. Hereinafter, positions where the bolts 131, 132, 133 and the nuts 141, 142, 143 are screwed and fastened as appropriate will be referred to as fastening points.

  The mounting bracket 122 has a triangular shape in plan view, and fastening points P1, P2, and P3 are arranged near each corner. The fastening points P1, P2, P3 are arranged around the damper axis AX so as to be separated from each other in the circumferential direction. Specifically, the first fastening point P1 is provided on the outer side in the vehicle width direction with respect to the damper axis AX and on the front side in the vehicle longitudinal direction, and the second fastening point P2 is located on the outer side in the vehicle width direction with respect to the damper axis AX and in the vehicle longitudinal direction. The third fastening point P3 is provided on the rear side, and is provided on the inner side in the vehicle width direction with respect to the damper shaft AX and substantially at the center between the first fastening point P1 and the second fastening point P2 in the vehicle longitudinal direction. Further, the first fastening point P1 and the third fastening point P3 are arranged at substantially the same position in the vehicle width direction.

  According to such an arrangement, the fastening points P1, P2, and P3 are arranged on vertices of a triangle having one side substantially parallel to the vehicle front-rear direction. Thereby, as can be understood from FIG. 3, the shape of the suspension tower reinforcement 12 </ b> A for increasing the rigidity of the suspension tower 12 can be narrowed inward in the vehicle width direction. Therefore, the amount of sheet metal as a material of the suspension tower reinforcement 12A can be reduced as much as possible.

  Here, while the vehicle is running, a force such as a torsional force according to the behavior of the wheel 90 is applied to the damper mounting surface 12a of the suspension tower 12 and the mounting bracket 122 of the damper top mount 120 of the damper 101. In this embodiment, even if the damper mounting surface 12a and the mounting bracket are slightly deformed around the fastening point due to such a force, the following configuration is performed so that they repeat contact and separation to generate abnormal noise. Has adopted.

  That is, as shown in FIGS. 4 and 5, a first elastic portion 123a, a second elastic portion 123b, and a third elastic portion 123c are provided on the upper surface 122a of the mounting bracket 122.

  The first elastic portion 123a is provided substantially at the center in the vehicle front-rear direction between the first fastening point P1 and the second fastening point P2 adjacent to each other. The second elastic portion 123b is provided substantially at the center in the vehicle width direction between the first fastening point P1 and the third fastening point P3 which are adjacent to each other. The third elastic portion 123c is provided substantially at the center in the vehicle width direction between the second fastening point P2 and the third fastening point P3 adjacent to each other. The first fastening point P1 and the second fastening point P2 are arranged at the same position in the vehicle width direction.

  The first elastic portion 123a extends like a band in the vehicle width direction on the outer side in the vehicle width direction with respect to the damper axis AX. The second elastic portion 123b extends in a band shape in the vehicle front-rear direction on the front side with respect to the damper axis AX. The third elastic portion 123c extends in the vehicle front-rear direction on the rear side of the damper shaft AX in a belt shape.

  The first elastic portion 123a located on the outermost side in the vehicle width direction has a larger band width and larger area than the remaining second elastic portion 123b and third elastic portion 123c.

  The first elastic portion 123a, the second elastic portion 123b, and the third elastic portion 123c have the same thickness in a non-compressed state.

  The first elastic portion 123a, the second elastic portion 123b, and the third elastic portion 123c are integrally formed as the elastic member 123, and extend from the annular portion 123d in a direction away from the damper axis AX.

  Here, as described above, the damper top mount 120 is fastened to the damper mounting surface 12a of the suspension tower 12 with a plurality of bolts 131, 132, 133 and nuts 141, 142, 143 with a specified torque. In this fastening state, the first elastic portion 123a is compressed by being sandwiched between the mounting bracket 122 and the damper mounting surface 12a, as shown in FIGS. Since the first elastic portion 123a is interposed between the mounting bracket 122 and the damper mounting surface 12a, the first elastic portion 123a is provided between the mounting bracket 122 and the damper mounting surface 12a as shown in FIG. A gap Ga is formed around the portion 123a. Although not particularly shown, the second elastic portion 123b and the third elastic portion 123c are similarly compressed by being sandwiched between the mounting bracket 122 and the damper mounting surface 12a. Since the second elastic portion 123b and the third elastic portion 123c are interposed between the mounting bracket 122 and the damper mounting surface 12a, the second elastic portion is provided between the mounting bracket 122 and the damper mounting surface 12a. A gap Ga is formed around 123b and the third elastic portion 123c.

  In the present embodiment, the thicknesses of the first elastic portion 123a, the second elastic portion 123b, and the third elastic portion 123c are set in consideration of the above-described compression.

  Specifically, the thickness of the first elastic portion 123a, the second elastic portion 123b, and the third elastic portion 123c is such that the first elastic portion 123a, the second elastic portion 123b, and the third elastic portion 123c deteriorate over time after the above-described fastening. Even if the thickness becomes thinner, the axial force of the fastening is set so as not to be excessively reduced. If the thickness of the elastic portion immediately after the fastening is large, the change in the thickness of the elastic portion due to aging is large, and the axial force of the fastening by the bolt and nut may be excessively reduced. In order to suppress such a decrease in the axial force, in the present embodiment, for example, the first elastic portion 123a, the second elastic portion 123b, and the third elastic portion 123c are combined with a thickness (a non-compressed state) before fastening (an uncompressed state). (Thickness) is 0.5 mm, and is fastened so that the thickness (second thickness) in the state of being fastened (compressed state) with M10 bolts is 0.1 mm. If the thickness after fastening is 0.1 mm, even if the first elastic portion 123a, the second elastic portion 123b, and the third elastic portion 123c become thin due to aging, the change in the thickness is larger than 0.1 mm. It will not be. Therefore, an excessive decrease in the axial force is suppressed. On the other hand, when the thickness after fastening is, for example, 0.3 mm, if the thickness is reduced to 0.1 mm or less due to aging, the change amount becomes about 0.3 mm, and the axial force may be reduced.

[Action, etc.]
In the rubber structure of the damper top mount 120 according to the present embodiment, as described above, the damper 101 is disposed in an inclined position such that the upper end side of the damper shaft AX is located on the inner side in the vehicle width direction as compared with the lower end side in front view. And a mounting bracket 122 provided at an upper end of the damper 101 is fixed to a damper mounting surface 12 a provided at an upper end of the suspension tower 12 from below. The mounting bracket 122 is fixed to the damper mounting surface 12a by a plurality of bolts 131, 132, 133 and nuts 141, 142, 143 (fastening members) at a plurality of fastening points P1, P2, P3. The plurality of fastening points P1, P2, P3 are arranged around the damper axis AX so as to be separated from each other in the circumferential direction.
In that case,
A plurality of elastic portions 123a, 123b, 123c made of rubber in a compressed state sandwiched between the mounting bracket 122 and the damper mounting surface 12a are provided between adjacent fastening points,
The elastic portion 123a located on the outermost side in the vehicle width direction has a larger area than the remaining elastic portions 123b and 123c.

  According to the rubber structure of the damper top mount 120 of the present embodiment, as described in detail above, since the elastic portions 123a, 123b, and 123c are interposed between the mounting bracket 122 and the damper mounting surface 12a, the mounting is performed. Gaps Ga are formed around the elastic portions 123a, 123b, 123c between the bracket 122 and the damper mounting surface 12a. As a result, even when vibration occurs during traveling of the vehicle or the like, contact at locations other than the fastening point between the mounting bracket 122 and the damper mounting surface 12a is suppressed, thereby suppressing generation of abnormal noise.

  In addition, by providing the first elastic portion 123a, the second elastic portion 123b, and the third elastic portion 123c in a compressed state sandwiched between the mounting bracket 122 and the damper mounting surface 12a between adjacent fastening points, The height of the upper end of the damper 101 can be reduced as compared with the case where the stepped portion is provided and the elastic portion in the non-compressed state is arranged.

  Here, the damper 101 is arranged in an inclined posture such that the upper end side of the damper shaft AX is located inside the lower end side in the vehicle width direction when viewed from the front. In such a damper 101, a larger compressive load acts on the first elastic portion 123a located on the outer side in the vehicle width direction than the second elastic portion 123b and the third elastic portion 123c on the inner side in the vehicle width direction. Assuming that the area of all the elastic portions is the same, the outer side in the vehicle width direction on which a large compressive load is applied is more strongly compressed. Further, assuming that the thickness of the elastic portion before compression is the same, the thickness of the elastic portion on the outside in the vehicle width direction after compression becomes the smallest. As a result, the gap interval around the elastic portion on the outer side in the vehicle width direction is smaller than the gap interval around the elastic portion on the inner side in the vehicle width direction, and the contact suppression effect between the damper mounting surface 12a and the damper top mount 120 is low. Could be. That is, the effect of suppressing abnormal noise may be reduced.

  In consideration of this, in the present embodiment, the area of the first elastic portion 123a located on the outer side in the vehicle width direction is increased as compared with the remaining second elastic portion 123b and the third elastic portion 123c, and , The load per unit area received by the first elastic portion 123a is reduced. Thus, the first elastic portion 123a located on the outer side in the vehicle width direction can be suppressed from being excessively compressed as compared with the remaining second elastic portion 123b and the third elastic portion 123c. Therefore, an appropriate gap can be provided also around the first elastic portion 123a on the outer side in the vehicle width direction. Therefore, an appropriate gap interval is secured between the damper mounting surface 12a and the damper top mount 120 irrespective of the position in the vehicle width direction, so that generation of abnormal noise can be more appropriately suppressed.

  As described above, according to the present embodiment, it is possible to achieve both suppression of generation of abnormal noise and suppression of an increase in the height of bonnet 15.

  In addition, the rubber structure of the damper top mount 120 according to the present embodiment has the following operations and effects.

That is, in the rubber structure of the damper top mount 120 of the present embodiment, as a plurality of fastening points,
A first fastening point P1 provided on the outer side in the vehicle width direction and on the front side in the vehicle front-rear direction with respect to the damper shaft AX;
A second fastening point P2 provided outside the vehicle width direction and rearward in the vehicle front-rear direction with respect to the damper shaft AX;
A third fastening point P3 is provided substantially at the center between the first fastening point P1 and the second fastening point P2 in the vehicle width direction with respect to the damper shaft AX and in the vehicle longitudinal direction.
As multiple elastic parts,
A first elastic portion 123a provided substantially at the center in the vehicle front-rear direction between the first fastening point P1 and the second fastening point P2;
A second elastic portion 123b provided substantially at the center in the vehicle width direction between the first fastening point P1 and the third fastening point P3;
A third elastic portion 123c provided substantially at the center in the vehicle width direction between the second fastening point P2 and the third fastening point P3 is provided.
The first elastic portion 123a has a larger area than the second elastic portion 123b and the third elastic portion 123c.

  According to this, when the first fastening point P1, the second fastening point P2, and the third fastening point P3 are provided around the damper shaft AX, the generation of abnormal noise is suppressed and the bonnet height is reduced with a simple structure. It is possible to achieve both suppression of the rise.

In the rubber structure of the damper top mount 120 according to the present embodiment,
The first elastic portion 123a extends like a band in the vehicle width direction outside the vehicle width direction with respect to the damper axis AX,
The second elastic portion 123b extends in a band shape in the vehicle front-rear direction on the front side with respect to the damper axis AX,
The third elastic portion 123c extends in the vehicle front-rear direction on the rear side of the damper shaft AX in a belt shape.
The first elastic portion 123a has a larger band width and a larger area than the second elastic portion 123b and the third elastic portion 123c.

  According to this, when the first fastening point P1, the second fastening point P2, and the third fastening point P3 are provided, both the suppression of the generation of abnormal noise and the suppression of the rise of the hood height are achieved with a simple structure. be able to.

In the rubber structure of the damper top mount 120 according to the present embodiment,
The first fastening point P1 and the second fastening point P2 are arranged at the same position in the vehicle width direction.

  In the vehicle having the first to third fastening points, the first fastening point P1 and the second fastening point P2 are often arranged at the same position in the vehicle width direction. It is possible to achieve both suppression of occurrence and suppression of an increase in hood height.

Further, in the rubber structure of the damper top mount 120 of the present embodiment,
Each of the elastic portions 123a, 123b, 123c has a first thickness in an uncompressed state.
The area of each elastic part 123a, 123b, 123c is determined by the thickness of each elastic part 123a, 123b, 123c in a state where each elastic part 123a, 123b, 123c is sandwiched between the damper mounting surface 12a and the damper top mount 120 and compressed. Is set in accordance with the compressive load acting on each of the elastic portions 123a, 123b, 123c so that the second thickness is smaller than the first thickness.

  According to this, it is possible to more appropriately secure the gap between the damper mounting surface 12a and the damper top mount 120 regardless of the position in the vehicle width direction, thereby more appropriately suppressing the generation of abnormal noise. Can be.

In the rubber structure of the damper top mount 120 according to the present embodiment,
The plurality of bolts 131, 132, 133 and the nuts 141, 142, 143 (an example of a fastening member) hold the mounting bracket 122 and the damper mounting surface 12a in a state where they sandwich the plurality of elastic portions 123a, 123b, 123c. , With a predetermined axial force.
The second thickness reduces the axial force of fastening by the plurality of bolts 131, 132, 133 and the nuts 141, 142, 143 (fastening members) even if the plurality of elastic portions 123a, 123b, 123c are thinned due to aging. The thickness is set so as not to decrease from a predetermined axial force by a certain amount or more.

  According to this, even if the plurality of elastic portions 123a, 123b, and 123c become thin due to aging, the mounting bracket 122 and the damper mounting surface 12a can be properly fastened by the plurality of elastic portions 123a, 123b, and 123c.

In the rubber structure of the damper top mount 120 according to the present embodiment,
The plurality of elastic portions 123a, 123b, 123c are integrally formed in one elastic member 123.

  According to this, the plurality of elastic portions 123a, 123b, and 123c can be collectively attached at one time. Therefore, the amount of mounting work can be reduced. Further, the accuracy of the positional relationship between the plurality of elastic portions 123a, 123b, 123c can be improved.

(Modification of First Embodiment)
A modification of the first embodiment will be described. FIG. 9 is a diagram corresponding to FIG. 5 regarding the damper top mount of the first modified example. FIG. 10 is a diagram corresponding to FIG. 5 for the damper top mount of the second modified example.

  In the example of FIG. 5 described above, the first elastic portion 123a, the second elastic portion 123b, and the third elastic portion 123c have a band-like shape extending radially outward from the annular portion 123d. May be provided.

  For example, as shown in FIG. 9, the first elastic portion 123a, the second elastic portion 123b, and the third elastic portion 123c are provided on the upper surface 122a of the damper top mount so as to have independent circular shapes in plan view. You may. In that case, the area of the first elastic portion 123a located on the outer side in the vehicle width direction is made larger than that of the remaining second elastic portion 123b and third elastic portion 123c. Thereby, an effect similar to that of the example of FIG. 5 described above is obtained.

  Further, as shown in FIG. 10, the first elastic portion 123a, the second elastic portion 123b, and the third elastic portion 123c are provided on the upper surface 122a of the damper top mount so as to have an independent square shape in plan view. You may. In that case, the area of the first elastic portion 123a located on the outer side in the vehicle width direction is made larger than that of the remaining second elastic portion 123b and third elastic portion 123c. Thereby, an effect similar to that of the example of FIG. 5 described above is obtained.

  The shape of each elastic portion is not limited to a circular shape or a square shape, but may be a triangular shape, a trapezoidal shape, or another shape.

  Further, in each of the examples including the modified example, the case where the first fastening point P1 and the second fastening point P2 are arranged at the same position in the vehicle width direction so as to be separated from each other in the front-back direction has been described. The present invention can also be applied to a case where the fastening point P1 and the second fastening point P2 are slightly shifted in the vehicle width direction. Also in this case, the first elastic portion 123a may be arranged at the middle in the front-rear direction between the first fastening point P1 and the second fastening point P2.

  Further, the first elastic portion 123a may be provided by being divided into a plurality of small elastic portions. Note that even in this case, the total area of the plurality of divided small elastic portions is set to be the same as the area of the first elastic portion 123a in the case of not being divided. When divided into small elastic parts, the small elastic parts can easily approach the fastening point. When the small elastic portion approaches the fastening point, the decrease in the axial force when the small elastic portion becomes thin due to aging tends to be remarkable. Therefore, from the viewpoint of suppressing the reduction of the axial force, it is preferable not to divide.

(Other embodiments)
In the embodiment, the example of the damper top mount having three fastening points has been described. However, the present invention is also applicable to a damper top mount having two, four or more fastening points. For example, the present invention can also be applied to a damper top mount of a rear suspension having two fastening points that are arranged at a distance from each other. In addition, the present invention is also applicable to a damper top mount having four fastening points that are arranged apart from each other in front, rear, left and right.

  INDUSTRIAL APPLICATION This invention can be utilized widely in the vehicle which has the suspension which suspends a wheel.

Reference Signs List 11 wheel house 12 suspension tower 12A suspension tower reinforcement 12a damper mounting surface 13 apron rain 14 front frame 15 bonnet 90 wheel 100 suspension device 101 damper 102 knuckle 103 wheel hub 111 cylinder 112 piston rod 112a screw portion 113 coil spring 114 upper spring seat member 115 Lower spring seat member 116 Annular rubber member 117 Bump stopper 118 Telescopic cover 120 Damper top mount 121 Rod bracket 121A Upper member 121B Lower member 121a Screw hole 121b Cylindrical part 122 Mounting bracket 122a Upper surface 122b, 122b, 122d Bolt insertion hole 122A Upper Plate 122B Lower plate 123 Elastic member 123a First elastic part 123b Second elastic portion 123c Third elastic portion 123d Annular portion 124 Inner pipe 131, 132, 133 Bolt 141, 142, 143 Nut 151 Nut AX Damper shaft Ga Gap P1 First fastening point P2 Second fastening point P3 Third fastening point

Claims (7)

A damper arranged in an inclined position such that the upper end side of the damper shaft is located on the inner side in the vehicle width direction as compared with the lower end side in a front view, and a mounting bracket provided at an upper end of the damper is provided at an upper end of the suspension tower. A rubber structure of a damper top mount fixed from below to the provided damper mounting surface,
The mounting bracket is fixed to the damper mounting surface at a plurality of fastening points by a plurality of fastening members,
The plurality of fastening points are arranged around the damper shaft so as to be separated from each other in a circumferential direction thereof,
Between adjacent fastening points, a plurality of rubber elastic portions in a compressed state sandwiched between the mounting bracket and the damper mounting surface are provided,
The rubber structure of the damper top mount, wherein the elastic portion located at the outermost side in the vehicle width direction has a larger area than the remaining elastic portion. As the plurality of fastening points,
A first fastening point provided on the outside in the vehicle width direction and on the front side in the vehicle front-rear direction with respect to the damper shaft;
A second fastening point provided on the outside in the vehicle width direction and on the rear side in the vehicle front-rear direction with respect to the damper shaft;
A third fastening point provided substantially at the center between the first fastening point and the second fastening point in the vehicle width direction with respect to the damper shaft and in the vehicle longitudinal direction;
As the plurality of elastic portions,
A first elastic portion provided substantially at the center in the vehicle longitudinal direction between the first fastening point and the second fastening point;
A second elastic portion provided substantially at the center in the vehicle width direction between the first fastening point and the third fastening point;
A third elastic portion provided substantially at the center in the vehicle width direction between the second fastening point and the third fastening point;
The rubber structure of claim 1, wherein the first elastic portion has a larger area than the second elastic portion and the third elastic portion. The first elastic portion extends in the vehicle width direction in a belt shape outside the vehicle width direction with respect to the damper shaft,
The second elastic portion extends in the vehicle front-rear direction on the front side with respect to the damper shaft in a belt shape,
The third elastic portion extends in a belt-like shape in the vehicle front-rear direction on the rear side with respect to the damper shaft,
The rubber structure of claim 2, wherein the first elastic portion has a larger band width and a larger area than the second elastic portion and the third elastic portion.   The rubber structure of a damper top mount according to claim 3, wherein the first fastening point and the second fastening point are arranged at the same position in a vehicle width direction. Each elastic portion has a first thickness in an uncompressed state,
The area of each elastic part is such that each elastic part has a second thickness smaller than the first thickness in a state where each elastic part is sandwiched between the damper mounting surface and the damper top mount and compressed. The rubber structure of a damper top mount according to any one of claims 1 to 4, wherein the rubber structure is set according to a compression load acting on each elastic portion. The plurality of fastening members fasten the mounting bracket and the damper mounting surface with a predetermined axial force in a state where they sandwich the plurality of elastic portions,
The second thickness is set to a thickness that does not reduce the axial force of fastening by the plurality of fastening members from the predetermined axial force by a certain amount or more even if the plurality of elastic portions are thinned due to aging. The rubber structure of the damper top mount according to claim 5, wherein:   The rubber structure of a damper top mount according to any one of claims 1 to 6, wherein the plurality of elastic portions are integrally formed in one elastic member.

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