JP3724276B2 - Dynamic damper mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the mounting of a dynamic damper that is mounted to improve vibration characteristics such as sound vibration performance of suspension components that constitute a suspension device, and particularly to the road surface facing a road surface such as a lower link or a suspension member. The present invention relates to a dynamic damper mounting structure effective for mounting a dynamic damper to a suspension part that may interfere with a road surface.
[0002]
[Prior art]
For example, as shown in FIG. 8, a rigid axle suspension includes a banjo-type axle housing 1 extending in the vehicle width direction, and lower links 2 directed forward in the vehicle front-rear direction from both ends of the axle housing 1. It is extended. The front end portion of each lower link 2 is supported by the vehicle body side member. In FIG. 8, reference numeral 3 represents an upper link, reference numeral 4 represents a shock absorber, and reference numeral 5 represents a suspension spring.
[0003]
Here, in order to improve the vibration characteristics of the lower link 2 by, for example, blocking vibration transmitted from the differential 6 to the lower link 2 as a countermeasure against a booming noise during acceleration, the front end side and rear side of the lower link 2 are improved. A dynamic damper may be attached to the end side (reference A in FIG. 8).
For example, as shown in FIG. 9, the dynamic damper 7 is attached to the lower link 2 by attaching a clamp-like damper mounting bracket 8 projecting downward from the dynamic damper 7 to the lower link 2. As shown in FIG. 5, the damper mounting bracket 9 is projected from the side surface of the lower link 2 in the vehicle width direction, and the dynamic damper 7 is mounted on the upper surface of the damper mounting bracket 9.
[0004]
[Problems to be solved by the invention]
In the dynamic damper mounting structure shown in FIG. 9, as shown in FIG. 9B, the road surface (curbstone) 14 may interfere with the dynamic damper 7 from the front side during forward traveling of the vehicle. There is a possibility that the impact force directed toward the rear in the vehicle longitudinal direction is input to the damper 7 and the dynamic damper 7 falls off. At this time, it is conceivable to separately attach a protective cover member in front of the dynamic damper 7, but there are problems such as space problems and an increase in the number of parts.
[0005]
Further, the dynamic damper mounting structure as shown in FIG. 10 cannot be adopted when other parts are arranged close to the side of the lower link 2, and the layout efficiency is not good. In particular, since the lower link 2 is a component that swings in the vertical direction, it is necessary to secure a space for a swing stroke in the vertical direction of the damper mounting bracket that protrudes to the side.
[0006]
The present invention has been made paying attention to the above problems, and provides a dynamic damper mounting structure capable of preventing direct interference between a dynamic damper and a road surface without increasing the mounting rigidity of the damper mounting bracket more than necessary. The challenge is to do.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention described in claim 1 of the present invention is a dynamic damper mounting structure to a suspension component constituting a vehicle suspension device, wherein the plate-shaped damper mounting bracket includes The suspension component projects downward with the plate thickness in the vehicle width direction, and a dynamic damper is mounted on the side of the damper mounting bracket. The front end surface of the damper mounting bracket in the vehicle front-rear direction However, the lower side of the upper side is an inclined surface located rearward in the vehicle longitudinal direction.
[0008]
Next, the invention described in claim 2 is characterized in that, with respect to the configuration described in claim 1, the suspension component to which the dynamic damper is attached is a lower link.
Next, the invention described in claim 3 is the configuration described in claim 1 or claim 2, wherein the dynamic damper is disposed on the surface side of the damper mounting bracket facing inward in the vehicle width direction. It is characterized by.
[0009]
Next, the invention described in claim 4 is applied to the structure described in any one of claims 1 to 3 on the surface side where the dynamic damper is arranged on the lower end surface of the damper mounting bracket. It is characterized by providing a flange to be taken out. Next, the invention described in claim 5 is characterized in that, with respect to the configuration described in claim 4, the flange is inclined so as to go downward as it goes in the overhanging direction with respect to the horizontal plane. Is.
[0010]
【The invention's effect】
According to the first aspect of the present invention, even if the damper mounting bracket is made of a plate-like member, a predetermined mounting strength is secured against an impact from the front in the vehicle front-rear direction by extending in the vehicle front-rear direction. Is done. By attaching the dynamic damper to the side surface of the damper mounting bracket, the road surface and the damper mounting bracket front end surface come into contact with each other before the road surface and the dynamic damper come into contact with each other during forward traveling of the vehicle. Interference is prevented.
[0011]
At this time, the front end surface of the damper mounting bracket is inclined, so that the external force that is input from the road surface to the front end of the damper mounting bracket toward the rear in the vehicle front-rear direction is the component of the horizontal component that is directed rearward in the vehicle front-rear direction. , It is divided into the component of the upper component heading upward. The suspension is stroked vertically by the upward component force, so that interference with the road surface is made up and down, and an impact is input when the damper mounting bracket and the suspension component to which the damper mounting bracket is mounted interfere. Becomes smaller. That is, as a result of reducing the input to the damper mounting bracket and the suspension component to which the damper mounting bracket is attached when the damper mounting bracket interferes with the road surface, the damper mounting bracket for interference with the road surface can be reduced. There is no need to set the mounting rigidity larger than necessary, and the space is advantageous in terms of weight.
[0012]
At this time, when the suspension component to which the dynamic damper is attached is the lower link as in the invention according to claim 2, the lower link swings up and down, so that the dynamic damper moves the lower link. As a result of the arrangement in the movement trajectory, the dynamic damper can be laid out with a minimum amount of space, so that the layout efficiency is improved.
[0013]
Furthermore, if the invention which concerns on Claim 3 is employ | adopted, there exists an effect that a dynamic damper is protected from the vehicle width direction outer side by the damper mounting bracket for damper mounting.
Further, when the invention according to claim 4 is adopted, there is an effect that the dynamic damper is protected from below by the flange.
[0014]
At this time, when the invention according to claim 5 is adopted, mud or the like placed on the upper surface of the flange is likely to fall along the slope of the flange, and there is an effect that it is difficult to form a mud pool on the upper side of the flange.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated about the member similar to the said prior art example.
In the present embodiment, a case where the dynamic damper 7 is attached to the rear end side of the lower link 2 of the rigid axle suspension as shown in FIG. 8 will be described as an example. The present invention is not limited to this suspension type.
[0016]
The damper mounting bracket 10 of the present embodiment is configured from a shape in which an inclined surface 11 is provided on the front end face of a substantially rectangular flat plate-like member as shown in FIG. 1 which is a side view and FIG. 2 which is a plan view. Is done. The inclined surface 11 is inclined such that the lower end portion is positioned on the rear side in the vehicle front-rear direction with respect to the upper end portion. The inclination angle θ is set to about 45 degrees.
[0017]
Flange 12 and 13 projecting inward in the vehicle width direction are formed on the front end surface and the lower end surface of the damper mounting bracket 10. However, the angle between the flange 13 provided on the lower end surface and the bracket body 10a is set to an obtuse angle (see FIG. 5), so that the flange 13 is inclined downward toward the overhanging direction. Thus, mud or the like placed on the upper surface of the flange 13 easily falls along the inclination of the flange 13. Two damper mounting bolt holes 10b are provided on the side surface of the damper mounting bracket 10.
[0018]
As shown in FIG. 3, the dynamic damper 7 to be mounted on the damper mounting bracket 10 has a mass body 7c attached to one surface of a flat mounting plate 7a via an elastic body 7b. Shaft portions of two mounting bolts 7d protrude from the other surface of the mounting plate 7a. Reference numeral 7e denotes a guide member of the mass body 7c.
[0019]
Next, the mounting of the dynamic damper 7 will be described. As shown in FIGS. 4 and 5, first, the upper end portion of the damper mounting bracket 10 is extended along the extending direction with respect to the outer surface of the lower link 2. It is fixed by welding. Accordingly, the damper mounting bracket 10 is in a state of projecting vertically downward from the lower link 2 with the plate thickness directed in the vehicle width direction. The dynamic damper 7 is attached to the side surface of the damper mounting bracket 10. That is, the bolt 7d of the dynamic damper 7 is inserted into the bolt hole 10b of the damper mounting bracket 10 from the inside in the vehicle width direction, and the dynamic damper 7 is fixed to the damper mounting bracket 10 by bolting.
[0020]
Next, functions and effects of the dynamic damper mounting structure having the above-described configuration will be described.
Even when the road surface (curbstone) 14 and the dynamic damper 7 have the same height when the vehicle including the dynamic damper 7 having the above configuration is traveling forward, before the road surface 14 and the dynamic damper 7 interfere with each other. The road surface 14 and the front end surface of the damper mounting bracket 10 interfere with each other, thereby preventing the road surface 14 and the dynamic damper 7 from interfering with each other.
[0021]
Further, at this time, the front end surface of the damper mounting bracket 10 is the inclined surface 11 whose lower side is directed rearward in the vehicle front-rear direction, so that the damper mounting bracket 10 is input from the road surface 14 to the damper mounting bracket 10 as shown in FIG. The external force F toward the rear in the vehicle front-rear direction is divided into a front-rear direction component Fh toward the rear in the vehicle front-rear direction and a vertical component Fv toward the up-down direction. For this reason, when the road surface 14 and the damper mounting bracket 10 interfere with each other, the suspension device strokes upward by the vertical component force Fv, so that the interference position with the damper mounting bracket 10 becomes the damper mounting as the vehicle travels. The damper mounting bracket 10 swings up and down so as to move rearward along the front end surface and the lower end surface of the bracket 10, that is, so as to ride on and pass over the road surface 14 on which the damper mounting bracket 10 interferes. Therefore, the load input to the damper mounting bracket 10 and the lower link 2 is reduced. In addition, since the external force at the time of interference is separated into the vertical component Fv and the front-rear component Fh as described above, the front-rear component Fh is also reduced. As a result, even if the damper mounting bracket 10 is not enlarged, the mounting is ensured so that the damper mounting bracket 10 does not fall off due to the road surface 14 interference.
[0022]
Here, if the inclination angle of the front end surface of the damper mounting bracket 10 is θ, and the external force toward the rear in the vehicle front-rear direction is F,
The vertical component force Fv is
Fv = F · sin θ · cos θ = (F / 2) · sin 2θ
The longitudinal force Fh is
Fh = Fsin ² θ
It becomes.
[0023]
Therefore, the vertical component force Fv becomes maximum at θ = 45 degrees, and a large vertical force acts on the lower link 2, so that the suspension device easily strokes up and down. Further, as the inclination angle θ is set to be significantly smaller than 45 degrees, the front-rear direction component force FH also becomes smaller. However, considering the vertical dimension necessary for mounting the dynamic damper, the inclined surface 11 is correspondingly increased. As the length increases, the size of the damper mounting bracket 10 in the front-rear direction increases, resulting in a disadvantage such as an increase in weight. From the above, the inclination angle θ of the inclined surface 11 is preferably around 45 degrees.
[0024]
The dynamic damper 7 is arranged on the lower side of the lower link 2, that is, as a result of being arranged in the swing locus of the lower link 2, so that the dynamic damper 7 can be mounted with a minimum space, and layout efficiency is improved. Is good. In particular, in this embodiment, the damper 10 is attached to the outer surface of the lower link 2, and the dynamic damper 7 is disposed on the inner surface of the damper mounting bracket 10. The dynamic damper 7 is prevented from protruding laterally from the lower link 2 in a plan view.
[0025]
Further, the dynamic damper 7 is protected by the lower flange 13 from splash water, stepping stones, and the like from the lower side. Further, even if the lower flange 13 is provided to protect the dynamic damper 7, mud or the like placed on the upper surface of the flange 13 falls along the slope of the flange 13 by tilting the flange 13 downward from the horizontal plane. This makes it easier to form a mud pool on the upper side of the flange 13.
[0026]
In addition, the dynamic damper 7 is protected from splash water, stepping stones, and the like from the front by the flange 13 provided on the front end surface.
Further, since the dynamic damper 7 is disposed on the inner surface side of the damper mounting bracket 10, the dynamic damper 7 is protected from a stepping stone from the outside in the vehicle width direction by the damper mounting bracket 10. However, in this embodiment, since the dynamic damper 7 is attached to the rear end portion side of the lower link 2, the outer side in the vehicle width direction is protected by the wheels, so the dynamic attachment is made on the outer surface side of the damper mounting bracket 10. Even if the damper 7 is provided, the outer side in the vehicle width direction is protected by the wheels. However, when it is arranged on the front end side of the lower link 2, it is not protected by the wheel, so it is preferable to arrange the dynamic damper 7 on the inner surface side of the damper mounting bracket 10.
[0027]
Here, although the case where the inclination of the inclined surface 11 provided on the front end surface of the damper mounting bracket 10 is set to a straight line is illustrated, it may be inclined by drawing a curve. In short, it is only necessary that the interference object in contact with the inclined surface 11 has a slope shape that is relatively easily guided downward along the inclined surface 11.
In the above embodiment, the damper mounting bracket 10 is fixed to the side surface of the lower link 2, but may be fixed to the lower surface of the lower link 2. Further, the mounting of the damper mounting bracket 10 to the lower link 2 is not limited to fixing, and a portion sandwiched in a clamp shape may be provided at the upper end of the damper mounting bracket 10 and fixed to the lower link 2. In short, what is necessary is just to project downward from the lower link 2.
[0028]
Further, in the present embodiment, the damper mounting bracket 10 is extended vertically downward, but as shown in FIG. 7, the damper mounting bracket 10 may be disposed so as to be inclined in the vehicle width direction. . In this case, even if the angle between the bracket body 10a and the lower flange 13 is orthogonal, the damper mounting bracket 10 is inclined downward.
[0029]
In the above embodiment, the lower link 2 is illustrated as an example of a suspension part to which the dynamic damper 7 is attached. The present invention is also effective.
[Brief description of the drawings]
FIG. 1 is a side view of a damper mounting bracket according to an embodiment of the present invention as seen from the outside in the vehicle width direction.
FIG. 2 is a plan view from above showing a damper mounting bracket according to an embodiment of the present invention.
3A and 3B are diagrams showing a dynamic damper according to an embodiment of the present invention, in which FIG. 3A is a plan view viewed from above, and FIG. 3B is a side view.
FIG. 4 is a side view showing the dynamic damper mounting structure according to the embodiment of the present invention as seen from the outside in the vehicle width direction.
FIG. 5 is a diagram showing a dynamic damper mounting structure according to an embodiment of the present invention as seen from the rear in the vehicle front-rear direction.
FIG. 6 is a diagram illustrating a state at the time of interference with a road surface 14;
FIG. 7 is a view showing another example of the posture of the damper mounting bracket.
FIG. 8 is a perspective view showing an example of a suspension device.
9A and 9B are views showing an example of a conventional dynamic damper mounting structure, where FIG. 9A is a plan view seen from above, and FIG. 9B is a side view seen from the outside in the vehicle width direction.
FIG. 10 is a view showing an example of a conventional dynamic damper mounting structure.
[Explanation of symbols]
2 Lower link (suspension parts)
7 Dynamic damper 10 Damper mounting bracket 11 Inclined surface 12 Front end flange 13 Lower flange 14 Road surface

Claims (5)

A dynamic damper mounting structure for a suspension component constituting a vehicle suspension device, wherein a plate-shaped damper mounting bracket projects downward from the suspension component in a state in which a plate thickness is directed in a vehicle width direction. A dynamic damper is attached to the side surface of the damper mounting bracket, and the front end surface of the damper mounting bracket in the vehicle front-rear direction is an inclined surface that is positioned rearward in the vehicle front-rear direction from the upper side. Dynamic damper mounting structure characterized by 2. The dynamic damper mounting structure according to claim 1, wherein the suspension component to which the dynamic damper is mounted is a lower link. 3. The dynamic damper mounting structure according to claim 1, wherein the dynamic damper is disposed on a surface side of the damper mounting bracket facing inward in the vehicle width direction. The dynamic damper mounting structure according to any one of claims 1 to 3, wherein a flange projecting toward a surface side where the dynamic damper is disposed is provided on a lower end surface of the damper mounting bracket. 5. The dynamic damper mounting structure according to claim 4, wherein the flange is inclined with respect to a horizontal plane so as to be directed downward as it extends in a protruding direction.

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