JPS634832Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a vibration-proof rubber assembly.

For example, in conventional automobile suspensions, the anti-vibration rubber interposed between the strut bar that provides longitudinal rigidity to the suspension arm and the mounting plate of the vehicle body has spring characteristics as shown in A and B in Figure 1. , characteristic A in which the load changes almost linearly with deflection, or characteristic B in which the load changes rapidly and becomes non-linear when the deflection reaches a certain amount, both of which have a large amount of deflection in the low load range. This means that the spring constant of the anti-vibration rubber is low in the low load range.

Conventionally, the reason why the spring constant of the vibration isolating rubber was low in the low load range was because the spring constant of the vibration isolating rubber could not be set high from the perspective of ensuring ride comfort. Situations such as a lack of steering response when steering at small steering angles and insufficient stability when driving at high speeds occurred.

Therefore, an object of the present invention is to provide a vibration isolating rubber assembly that can increase the spring constant in a low load range.

Still another object of the present invention is to provide a vibration-isolating rubber assembly for an automobile suspension that does not adversely affect riding comfort or stability even if the spring constant in the low load range is increased.

By the way, a vibration isolating rubber assembly that is interposed between a member such as a strut bar to which bending force is applied in addition to the axial force during use and a fixed member such as a mounting plate of the vehicle body is When a bending force is applied to this, it can swing relative to the latter member.
It is preferable that the former member can be deflected in a direction inclined to the axis of the member when no bending force is applied thereto, that is, in a prying direction.

From this point of view, the present invention which achieves the above object is a vibration isolating rubber assembly having a pair of retainers applied to both ends of a collar passing through a mounting plate, the vibration isolating rubber assembly having a cylindrical retainer disposed on one side of the mounting plate. A first elastic body, and a cylindrical part that penetrates the elastic body and slidably passes through the collar, and is formed in a shape that has a minimum inner diameter in the middle and gradually increases in inner diameter from the smallest part toward both ends. a cylindrical portion having a flat inner peripheral surface; and a flange portion extending radially outward from one end of the cylindrical portion and in contact with an outer end surface of the elastic body; a holding member that holds the holding member in a preloaded state; a second cylindrical elastic body interposed between the flange portion of the holding member and the one retainer; and the other side of the mounting plate. and a cylindrical third elastic body interposed between the retainer and the other retainer.

When a load is applied to the vibration isolating rubber assembly via the retainer from the side where the first elastic body is placed to the side where the third elastic body is placed, this load is transferred to the first elastic body. Until the preload given to is reached,
After only the second and third elastic bodies are deflected and the preload is reached, the first, second and third elastic bodies are simultaneously deflected and exhibit favorable spring characteristics.
Also, when bending force is applied to the member that passes through the collar, the vibration-proof rubber assembly will bend in the prying direction.
This member will swing with respect to the mounting plate together with the collar.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the present invention is a vibration isolating rubber assembly having retainers 14 and 15 respectively applied to both ends of a collar 12 passing through a mounting plate 10 fixed to a vehicle body. elastic body 1
6, a holding member 18, a second elastic body 20, and a third elastic body 22.

The first elastic body 16 is made of rubber and has a cylindrical shape, and is arranged on one side of the mounting plate 10 together with the stopper 24 .

The holding member 18 has a cylindrical portion 25 and a flange portion 26.
, a nut 27, an elastic plate 28, and an adjustment collar 29. In the illustrated example, the cylindrical portion 25 passes through the elastic body 16 and the adjustment collar 29, and also slidably passes through the collar 12. The inner peripheral surface 30 of this cylindrical portion 25 has a shape in which the inner diameter is the minimum at the middle and the inner diameter gradually increases from the minimum point toward both ends.
has. This shape of the inner circumferential surface 30 allows the collar 12 to swing without applying any lateral force to the elastic body 16. The middle part 31 is the cylindrical part 2
5, and the inner diameter of the inner circumferential surface 30 at this portion 31 is preferably close to the outer diameter of the collar 12 to the extent that sliding of the collar 12 is not hindered. This can prevent the collar 12 from moving in the radial direction with respect to the cylindrical portion 25.
Moreover, it is preferable that the inner peripheral surface 30 has a smooth curved shape as shown in the drawing. This curved inner peripheral surface 3
According to No. 0, when the collar 12 swings, the collar 12 contacts the inner circumferential surface 30 of the cylindrical portion 25 above and below the intermediate portion 31, regardless of the magnitude of the angle of inclination. will be held stably in the swinging state.

A flange portion 26 is provided extending radially outward from one end of the cylindrical portion 25 . This flange portion 26 contacts the outer end surface of the first elastic body 16 , that is, the end surface 17 that is far from the mounting plate 10 . The cylindrical portion 25 has a screw 32 at the other end. Screw the nut 27 into this screw 32, and then
Tighten the adjustment collar 29 through the mounting plate 1.
The elastic body 16 is held between the elastic member 0 and the flange portion 26. As a result, the clamping member 18 applies the preload determined by the length of the adjustment collar 29 to the elastic body 1.
6 and hold in this state. Adjustment collar 2
9 is preferable because it makes it easy to determine the preload to be applied to the elastic body 16.

The elastic plate 28 is annularly formed of rubber, resin, or the like. This elastic plate 28 prevents the mounting plate 10 and the nut 27 from interfering with each other and causing a tapping sound when the load is suddenly removed from the compressed state of the elastic body 16. Therefore, it is preferable to interpose the elastic plate 28 as shown in the figure.

In addition to the above, the elastic body 16 can also be held by using an annular ring instead of the nut 27, and by press-fitting this ring into the cylindrical part 25 without providing the screw 32 in the cylindrical part 25. .

The second elastic body 20 is made of rubber and has a cylindrical shape, and is connected to the flange portion 26 of the holding member 18 and the retainer 1.
4. Further, the third elastic body 22
is formed of rubber into a cylindrical shape and is disposed between the other side of the mounting plate 10 and the retainer 15.

The anti-vibration rubber assembly is put into use by screwing a nut 38 through a washer 36 to the end of the strut bar 34, which protrudes from one retainer 15 through the collar 12 to the outside of the other retainer 14, for example.

Now, the spring constant of the first elastic body 16 is K ₁ , the spring constant of the second elastic body 20 is K ₂ , the spring constant of the third elastic body 22 is K ₃ , and the first elastic body 16 is It is assumed that the member 18 maintains a preload state of F ₀ . When using the anti-vibration rubber assembly,
When an axial load F acts on the strut bar 34 in the direction of the arrow, this axial load is applied to the second elastic body 20 via the retainer 14, and then to the second elastic body 20.
is transmitted to the clamping member 18 via. However, F
Until F ₀ is reached, the first elastic body 16 held in a preloaded state by the clamping member 18 does not deflect at all, and only the second elastic body 20 and the third elastic body 22 deflect. , Therefore, the spring constant K at this time is K=K2+K3, and when the load is F0, the deflection is δ0. When the axial load becomes larger and becomes F>F0, the second elastic body 20 and the third elastic body 22
In addition, the first elastic body 16 is bent to form a series spring, K=1/{1/K1+1/
(K2+K3)}. As a result, the theoretical correlation between the load F and the deflection δ is as shown in FIG. K2
Since +K3>1/{1/K1+1/(K2+K3)}, the spring constant in the low load range is higher than the spring constant in the high load range.

In reality, since the elastic body such as rubber constituting the vibration isolating rubber assembly according to the present invention has nonlinear characteristics, the correlation between load and deflection becomes a characteristic diagram as shown in C in FIG.

Note that in a region of extremely high loads, it is preferable to prevent the first elastic body 16 from being bent too much and to increase the durability of the first elastic body 16. For this purpose, as in the illustrated example, the first elastic body 1
6 is attached with a stopper 24 made of resin or the like, and after the flange portion 26 of the clamping member 18 abuts against this stopper 24, the first elastic body 16
is hardly deformed, and the spring constant is increased by the second elastic body 20 and the third elastic body 22. In the illustrated example, the stopper 24 is a single annular body, but the stopper 24 can also be formed by arranging a plurality of members at intervals in the circumferential direction.

The vibration isolating rubber assembly shown in FIG. 4 has the same basic configuration as the example shown in FIG. 2. But in this example,
The second elastic body 20 and the third elastic body 22 integrally have a rigid plate 40 between them. The rigid plate 40 is made of metal or resin, which has sufficiently higher rigidity than rubber. This rigid plate 4
By installing 0, the load is reduced compared to the above example.
It is possible to reduce the slight amplitude in the low load range below F0 and the dynamic spring constant at high frequencies, making it possible to further improve small vibrations and noise.

The vibration isolating rubber assembly shown in FIG. 5 has the same basic configuration as the example shown in FIG. 2. However, in this example, the second elastic body 20 and the third elastic body 22 have a groove 42 extending all around the outer periphery. Because of this groove 42, the characteristics shown in FIG. 6 are exhibited. That is, the spring constant until a very low load F1 (deflection δ1 at that time) is reached is K=K4 (K4<K2+K3), which is lower than the spring constant of the vibration isolating rubber assembly of the above example. As a result, vibration and noise at extremely small amplitudes can be improved.

FIGS. 7a to 7c show a second elastic body 20 and a third elastic body 22 that provide the same effect as the groove 42.
This is an example. That is, the elastic bodies 20, 2 in FIG.
2 has a groove 44 extending in the circumferential direction on a surface facing the retainers 14, 15 and the flange portion 26 (mounting plate 10), respectively. In addition, the elastic body 2 in figure b
0 and 22 have a curved surface 46 on the outer peripheral edge, and the thickness of the outer peripheral portion is smaller than the thickness of the central portion. Further, the elastic bodies 20 and 22 shown in FIG.

According to the present invention, the spring constant can be increased in the low load range, so there is no lack of steering response when steering at minute steering angles, and stability is sufficiently increased when driving at high speeds. be able to. In particular, by providing a so-called inverted S-shaped spring characteristic, it is possible to improve ride comfort in a low load range, and in particular, to sufficiently absorb shock when riding on a projection such as a harshness.

Furthermore, since the member passing through the collar can swing relative to the mounting plate, when a bending force is applied to the member, the vibration-isolating rubber assembly can deflect in the prying direction to absorb the force. Therefore, it is possible to prevent an increase in prying stiffness that occurs when the collar penetrates the cylindrical portion of the clamping member, and to reduce vibration noise.
Good riding comfort can be maintained.

[Brief explanation of the drawing]

Fig. 1 is a characteristic diagram showing the correlation between load and deflection of various anti-vibration rubber assemblies, Fig. 2 is a sectional view of the anti-vibration rubber assembly according to the present invention, and Fig. 3 is a diagram showing the relationship between the vibration-isolating rubber assembly according to the present invention. Theoretical characteristic diagram of the rubber assembly, Figures 4 and 5 are sectional views showing different examples, Figure 6 is a diagram of the characteristics exhibited by the vibration isolating rubber assembly of Figure 5, and Figure 7. 6A to 6C are cross-sectional views showing another example of an elastic body that obtains the characteristics shown in FIG. 6; 10: Mounting plate, 12: Collar, 14, 15: Retainer, 16: First elastic body, 18: Holding member,
20: second elastic body, 22: third elastic body, 2
5: cylinder part, 26: flange part, 40: rigid plate, 42: groove.

Claims (1)

[Scope of utility model registration request] A vibration-proof rubber assembly having a pair of retainers applied to both ends of a collar passing through a mounting plate, the first cylindrical retainer being disposed on one side of the mounting plate.
an elastic body, and a cylindrical part that penetrates the elastic body and slidably passes through the collar, and is formed in a shape that has a minimum inner diameter in the middle and gradually increases in inner diameter from the smallest part toward both ends. a cylindrical portion having an inner circumferential surface; and a flange portion extending radially outward from one end of the cylindrical portion and in contact with an outer end surface of the elastic body, the elastic body being disposed between the flange portion and the mounting plate. a holding member that holds the holding member in a preloaded state; a second cylindrical elastic body interposed between the flange portion of the holding member and the one retainer; and the other side of the mounting plate. a third cylindrical elastic body interposed between the other retainer;
Anti-vibration rubber assembly.