JPS6214432Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cushion device having non-linear characteristics, in particular for fastening a body and a member (frame) such as a cross member or a center member in a vehicle. Deployed for purposes such as vibration isolation and soundproofing,
This invention relates to improvements in cushions such as bodies, mountings, and rubber members.

Conventionally, when a predetermined first member and a second member are connected, such as between a vehicle body and various members (frames), an appropriate cushion made of a rubber elastic body is provided between them. The aim is to prevent the transmission of vibration and noise between the two. For example, the body as such a cushion.
As shown in FIG. 1, the mounting rubber member (hereinafter simply referred to as the rubber member) consists of a metal fitting (washier) 4 and a rubber body 6 which is vulcanized and bonded to the metal fitting (washier) and has a through hole in the center. The two rubber members, as an upper rubber member 8 and a lower rubber member 10, sandwich the member 12 facing each other from its upper and lower surfaces, and also have a collar 14 and a spacer 1.
A through bolt 18 is passed through the member 12 through the member 6, and the through bolt 18 passes through the body 20 on the upper rubber member 8 side and is tightened with a nut 19, thereby creating a gap between the member 12 and the body 20. installed.

By the way, when a compressive force in the Y direction is applied to such an upper rubber member 8, the rubber body 6 spreads in the X direction (radial direction in a plane perpendicular to the Y direction). Furthermore, with a force in the direction opposite to Y, compressive force is applied to the lower rubber member 10, and expansion in the X direction similarly occurs. In this case, the change in the deflection e with respect to the load P has a substantially linear shape in the actual usage range, as shown by the broken line A in the graph of FIG. Therefore, if the rubber body 6 is made to have soft spring characteristics in the actual range of use,
Under heavy loads, the deflection becomes too large, which is not practical, and the rubber has the disadvantage of poor durability. On the other hand, if the rubber body 6 is made of a hard material in consideration of the possibility of applying a large load, a problem arises in that it becomes extremely difficult to suppress vibrations under a small load. As described above, since the spring characteristics of the conventional rubber members 8 and 10 are close to linear characteristics in the low load range of actual use, there is a great deal of difficulty in selecting the rubber material and in terms of vibration damping performance. It has the inherent problem of being subject to restrictions.

For this reason, conventionally, in the low load range of actual use, soft rubber exhibits a linear deflection change, but when a large load is applied, the deflection change is inhibited, as shown in curve B in Figure 2. Although progress is being made in developing rubber members (cushions) having nonlinear characteristics as shown in FIG.

Here, the inventor, after considering the above circumstances and conducting various studies, concluded that generally, such cushions are used in pairs to prevent the application of shear loads due to twisting, prying, etc., and the two cushions are spaced about 60 mm apart.
Since the body and member are supported between these points, the inventors came up with the idea of integrating these two cushions, and discovered that by skillfully utilizing the shape of the connecting parts formed for this integration, it is possible to freely adjust the spring characteristics to the desired nonlinear characteristics, thus arriving at the present invention.

That is, the object of the present invention is to provide a cushion device that can effectively exhibit the nonlinear characteristics shown by curve B in FIG. As a cushion device used for fastening with a member, a cushion consisting of a pair of rubber elastic bodies for isolating vibration or noise is used, and the first member is placed between the two rubber elastic bodies of the cushion. A structure in which the second member is positioned on the side opposite to the first member of the rubber elastic body located on one side of the first member to perform the fastening. In this method, two sets of the cushions are used, and the cushions are arranged in parallel so that the first member and the second member can be fastened together, while the cushions are arranged in parallel so that the first member and the second member can be fastened together. The metal fittings which are vulcanized and bonded to the ends of the corresponding rubber elastic bodies opposite to the first member between the cushions are integrated into one plate, and the rubber of the plate is integrated. A portion located between the elastic bodies is made to protrude toward the first member by a predetermined height, and a layer of a predetermined thickness made of a rubber elastic material is provided on the surface of the protruding portion facing the first member. The present invention relates to a cushion device having nonlinear characteristics characterized by: By mounting such a cushion device between two members such as between a predetermined body and a member, the protruding portion on which the rubber elastic material layer of the metal part between the rubber elastic bodies is formed can be removed. , becomes an effective stopper portion that comes into contact with a first member such as the member, and thus large deformation of the cushion under heavy loads can be advantageously prevented, thereby allowing desired nonlinear characteristics to be expressed. It is.

Hereinafter, one embodiment of the cushion device according to the present invention will be described in more detail based on the drawings.

FIG. 3 is a plan view showing an example of the rubber member (body mounting rubber member) used in the cushion device according to the present invention; FIG. 4 is a half-sectional front view thereof; and FIG. 4 is a partially sectional view of the connection thereof. Fifth
In the figure, the rubber member is composed of two rubber elastic bodies 2
2 and 24, and one metal fitting 26 that connects them to form one unit. These two rubber elastic bodies 22 and 24 have a short and small cylindrical shape, and are vulcanized into a single plate-like metal fitting 26 at a predetermined distance on one side (end) thereof. It is glued. In addition, both rubber elastic bodies 2 of this example
Annular slits or grooves 28 are provided on the outer peripheral surfaces of the rubber 2 and 24, respectively, to increase the free surface and soften the spring characteristics in the low load range. elastic body 22,
A large diameter recess 30 is provided on the other side of 24 into which a spacer 38 (FIG. 6) is inserted when mounted on a vehicle.

On the other hand, the metal fitting 26 that connects these two rubber elastic bodies 22, 24 is
are each provided with a bolt hole 32 concentric with the rubber elastic body at a portion to be vulcanized and bonded, and a metal fitting portion 34 located between the rubber elastic bodies 22 and 24, in other words, a connecting portion, is provided on the other side. A trapezoidal projection 34 is formed on the trapezoidal projection 34, and a rubber layer 36 of a predetermined thickness made of a rubber elastic material connects the rubber elastic bodies 22, 24 by vulcanization adhesion. It has a structure formed like this. Note that the height h of the rubber layer 36 on the protrusion 34 is made lower than the height H of the rubber elastic bodies 22 and 24, and as will be described later, the height h of the rubber layer 36 on the protrusion 34 is set lower than the height H of the rubber elastic bodies 22 and 24, so that the height h of the rubber layer 36 on the protrusion 34 is set lower than the height H of the rubber elastic bodies 22 and 24, so that the height h of the rubber layer 36 is set lower than the height H of the rubber elastic bodies 22 and 24. It's starting to happen. Moreover, this rubber layer 36 is for avoiding metal-to-metal contact between the protrusion 34 and members such as members.

As shown in FIG. 6, the rubber members configured as described above are mounted so that two of them sandwich a member (frame: first member) 12 such as a cross member or a center member. (Second member) 20 and member 12 are fastened together. That is, member 1
Two rubber members 42 and 44 are attached to the spacer 38 set in the hole provided in the metal fitting 2 and the collar 40 passing through the spacer 38 from above and below.
The body 20 and the member 12 are fastened together via the two rubber members 42 and 44 by being mounted so as to face each other with the 6 side facing outward and being tightened to the body 20 with a through bolt 46 and a nut 48. It is being done. The two opposing rubber elastic bodies 22, 22; 24, 24 of these two rubber members 42, 44 constitute a cushion, and the member 12 as a first member and the member 12 as a second member It has a structure in which it is interposed between the body 20 and the body 20. Note that by tightening with the through bolt 46 and nut 48, the height H of the rubber elastic bodies 22, 24 of each rubber member 42, 44 becomes slightly lower;
A sufficient and desired gap l is still secured between the upper surface of the rubber layer 36 at the connecting portion of each rubber member 42, 44 and the member 12.

Therefore, in this way, the two upper and lower rubber members 4
2 and 44 are mounted, when a force in the Y direction such as a body load gradually increases, the two rubber elastic bodies 2 of the upper rubber member 42
As the compressive force on the rubber elastic bodies 22 and 24 increases, the outer peripheral surfaces of the rubber elastic bodies 22 and 24 expand and move outward, and their height gradually decreases, but within a certain load range. There is still a gap l between the rubber layer 36 of the connecting part and the member 12. As long as this gap l exists, the load and the deflection are in a substantially proportional relationship, that is, the load-deflection characteristic is linear.

However, when the load exceeds a certain value, the gap l becomes zero, and the rubber layer 36 at the connection part comes into contact with the member 12, but the rubber layer 36
Since the rubber elastic bodies 22 and 24 are supported by the protrusions 34 of No. 6, further changes in height of the rubber elastic bodies 22 and 24 are prevented. That is, the metal protrusion 34 located at the connecting portion between the rubber elastic bodies 22 and 24 and the rubber layer 36 thereon constitute a stopper part, and when this comes into contact with the member 12, the rubber elastic bodies 22, By limiting the load applied to 24 and thereby preventing its compressive deformation,
As shown by the load-deflection curve B in FIG. 2, the upper rubber member 42 is given a non-linear load-deflection characteristic.

If a load acts in the direction opposite to the Y direction, the same compressive force as described above will act on the lower rubber member 44, so if the lower rubber member 44 is linear within a predetermined load range, but exceeds the predetermined load. In this case, nonlinear load/deflection characteristics are applied, just as in the case described above.

In this way, it is possible to provide linear and non-linear load/deflection characteristics not only for the load in the Y direction but also for the load in the opposite direction, and furthermore, the size of the gap l can be appropriately adjusted. By doing so, it is also possible to move the transition point from linear to nonlinear shown at point C in FIG. 2. In particular, the size of the gap 1 is determined by the size of the protrusion 3 of the metal fitting 26.
Since the height of the rubber layer 4 and the thickness of the rubber layer 36 can be freely adjusted, they can be set arbitrarily, and therefore the spring characteristics in the Y direction or the opposite direction can be adjusted to any desired nonlinear characteristics. It became possible to do so.

As a result, it has become possible to make the spring characteristics extremely soft in the range of regular use, and to provide non-linear spring characteristics such as curve B in Figure 2, which has a sharply increased slope under heavy loads. be. In other words, while normally acting as a suitable soft spring, when subjected to an appropriate impact, it acts hard and prevents excessive deformation, which reduces the durability of the rubber member. It could have been effectively prevented. Furthermore, since the two cushions are integrated, the assembly work is only required once, and the assembly work efficiency can be significantly improved compared to the conventional method. Furthermore, since the shape, dimensions, assembly method, dedicated space, etc. are almost the same as the conventional two-piece type, it has the advantage of being highly compatible, and can produce various effects. It was summer.

In addition, the stopper part (projection part 3
The height of the 4+ rubber layer 36) will be determined as appropriate depending on the desired nonlinear characteristics, but the trapezoidal shape shown in the example is the most effective for receiving the load effectively. be. Further, the rubber layer 36 includes two rubber elastic bodies 22, as illustrated.
In addition to being vulcanized and bonded over the entire upper surface of the protrusion 34 so as to integrally connect the members 12
There is no problem in providing it independently only at the part where it comes into contact with the trapezoid (upper base part of the trapezoid).

Further, although the present invention was developed particularly as a body mounting rubber member for a vehicle, it is not limited thereto and can be widely used as a cushion device between the body and various members of a vehicle.

Furthermore, in addition to the above-mentioned examples, various changes and improvements can be made to the present invention based on the knowledge of those skilled in the art without departing from the spirit of the present invention, and these aspects are also within the scope of the present invention. Needless to say, it is included in

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a conventional rubber member when assembled, and Fig. 2 shows load p-deflection e characteristic curves for the conventional (broken line A) and the present invention (solid line B). The figure is a plan view of an embodiment of the present invention, FIG. 4 is a cross-sectional view of FIG. 3, and FIG.
The figure is a cross-sectional view taken from FIG. 3, and FIG. 6 is a vertical cross-sectional view when assembled. 12...Member, 20...Body, 22,2
4...Rubber elastic body, 26...Metal fitting, 28...Annular slit, 34...Protrusion, 36...Rubber layer, 4
2... Upper rubber member, 44... Lower rubber member, 4
6...through bolt, 48...nut.

Claims (1)

[Claims for Utility Model Registration] A cushion device used to connect a first member and a second member in a vehicle, consisting of a pair of rubber elastic bodies for insulating vibration or noise. is used to sandwich the first member between the two rubber elastic bodies of the cushion, while the rubber elastic body located on one side of the first member has the rubber elastic body on the opposite side of the first member. In a structure in which the second member is positioned and fastened, the first member and the second member are fastened by using two sets of the cushions and arranging the cushions in parallel. At the same time, metal fittings are vulcanized and bonded to the ends of the corresponding rubber elastic bodies opposite to the first member between the cushions that sandwich the first member. The first member is integrally formed with a single plate, and a portion of the plate located between the rubber elastic bodies projects a predetermined height toward the first member. A cushion device having nonlinear characteristics, characterized in that a layer of a predetermined thickness made of a rubber elastic material is provided on a side surface.