JPS6267341A - Vibro-isolating rubber - Google Patents

Abstract

PURPOSE:To enable an elastic rubber material to decrease its spring out, by spreading end parts of opposed rigid members to be opened in a direction separating from each other while mounting the elastic rubber material. CONSTITUTION:A vibro-isolating rubber, spreading opposed both end parts of an inner cylinder 1 and an outer cylinder 2 to be opened in a direction separating from each other, mounts an elastic rubber material 3 up to said spread opened parts 4, 4 of the cylinders. If assumed l for length of a straight part in the both cylinders 1, 2 and (x) for length of a tilt part starting to spread and open, a proportion of l:x is set to 6:1-5:1. Accordingly, the vibro-isolating rubber, enlarging a sectional area in the opening part of the elastic rubber material 3 as compared with its intermediate part, decreases a spring out of the elastic rubber material 3 to a small amount when external force is applied acting.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a vibration isolator in which an elastic rubber body is installed between rigid members, which is used for the purpose of preventing the transmission of perturbation and WE impact, or for the purpose of IIfi. It is rJjJ long to rubber.

[Conventional technology]

As an example of a conventional anti-vibration rubber, a cylindrical anti-vibration rubber is known in which an elastic rubber body 102 is attached between an inner tube (rigid member) 100 and an outer tube (rigid member) 101 as shown in FIG. It is being

[Problem to be solved]

In a cylindrical vibration isolator in which an elastic rubber body 102 is installed between an inner cylinder 100 and an outer station 101, the outer peripheral surface of the inner cylinder 100 and the inner peripheral surface of the outer cylinder 101 that contact the elastic rubber body 102 are flat. In order to improve the durability, either increase the thickness of the elastic rubber body 102 or increase the spring constant in the direction perpendicular to the axis to keep the deflection small and within the allowable distortion range. It was designed by someone. Elastic rubber body 10
Increasing the thickness of No. 2 has the disadvantage that the entire anti-vibration rubber becomes large. Another drawback is that increasing the spring constant reduces the vibration-proofing effect. Generally, the lifespan of the elastic rubber body 102 under the same load is limited by the fact that when an external force is applied to the elastic rubber body 102, the elastic rubber body 102 bends, and as a result, an unconstrained opening that is not joined to the inner and outer cylinders 100, 101 The rubber protrudes at both left and right ends in FIG. 9 (the part shown in FIG. 9), and local distortion is concentrated in this A part. The magnitude of the distortion is determined by the size and shape of the protrusion of the elastic rubber body 102.
The lifespan was determined by the amount of distortion in the hot water section. When the deflection δ shown in FIG. 9 was Q, 4n, the strain at the bottom reached as much as 240%, as shown in FIG. 4.

Therefore, in order to increase durability without changing the deflection under the same load, this invention has been developed to reduce local distortion without increasing the overall thickness of the elastic rubber body and without increasing the spring constant of the elastic rubber body. The purpose of the present invention is to provide a protective rubber that can suppress the pressure.

(Means for Solving the Problems) In order to achieve the object mentioned above, the present invention provides an anti-vibration system in which an elastic rubber body is sandwiched between two rigid members, in which opposing lengths are One or both of the ends of the rigid member are expanded in a direction away from each other, and an elastic rubber body is attached to the expanded portion.

(Function) In this invention, the cross-sectional area of the opening of the elastic rubber body is enlarged compared to the middle part, which reduces the protrusion of the elastic rubber body when an external force is applied, and as a result, local distortion is reduced. did it.

(Actual Example) Preferred embodiments of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIGS. 1 and 2, the inner cylinder (rigid member) 1
1 shows a vibration isolating rubber in which an elastic rubber body 3 is mounted between an outer cylinder (rigid member) 2 and an outer cylinder (rigid member) 2. The opposing ends of the inner tube 1 and the outer tube 2 are expanded in the direction of 111tlIi to each other, that is, the cross-sectional area of the elastic rubber body 3 is widened at the opening, and this expanded portion 4.4
The elastic rubber body 3 is used until the end. Assuming that the length of the straight portion of both cylindrical bodies 1.2 is J21, and the length of the inclined portion that begins to expand is X, the ratio of B:X is set to 6:1 to 5:1.

If the length of the straight part expanded at both ends (vertical direction in Figure 3) is d, and the length of the elastic rubber body 3 at the straight part (vertical direction in Figure 3) at the straight part is D, then Dx (0,2
~0.4) Set to 72d. Also, the relationship is set as ×−℃−21÷2. The most recessed part of the opening of the elastic rubber body 3 is located outward by 1 length of the elastic rubber body 3, respectively.
1f1' is desirable. The embodiment shown in FIG.
As a result of comparing the local distortion with the conventional product shown in FIG. 9, the results shown in FIG. 4 were obtained.

:n4 diagram shows a comparison under the same load and constant deflection.

When the deflection peaks were Q and 4H, the conventional product exhibited a local strain of 240%, but the example shown in FIG. 3 according to the present invention exhibited a local strain of 140%. Also, O-0
When mixed repeatedly in the range of , 5mm, the conventional product
Local strain failure occurred after o and ooo cycles, but in the example of the present invention shown in FIG. 3, failure was avoided up to 350,000 cycles. The fifth factor shows the protruding portion 3A from the frontage of the elastic rubber body 3 in a state where the elastic rubber body 3 is bent by δ. It has become clear that this protruding portion 3A is smaller and has less local distortion than the conventional one.

Another embodiment shown in FIG. 6 shows that a stopper part 5 with a reduced cross-sectional area is formed after the expanded part 4. The inclination angle α of the second base 1 and the brim portion 5 was set to 201 to 10 degrees. In this way, following the expanded portion 4, the strip 1-buckwheat portion 5
In the case where the 7th
As shown in the figure, the load capacity has improved. The portion indicated by B in FIG. 7 indicates the allowable distortion limit value.

In each of the deer examples explained above, the widened part 4 A'1 - brim group 5 is arranged symmetrically in both the inner cylinder 1 and the outer cylinder 2.
However, the expanded portion 4 and the stopper portion 5 may be formed only on either one. Further, a plurality of outer cylinders are provided around the outer circumference of the outer cylinder 2, and one elastic rubber body 3 is placed between the outer cylinders. It goes without saying that the widened portions 4 can be formed on each item that is worn.

The embodiment shown in FIG. 8 shows an example applied to compression type vibration isolating rubber f0 The present invention is not necessarily applied only to cylindrical vibration isolating rubber, but a plate as shown in FIG. 8. (Il
An elastic rubber body 3 is installed between the plate (rigid member (4) 7) and a widening portion 4 is provided on the opening side of the elastic rubber body 3, and the widening portion 4. It is also legal to install an elastic rubber body 3 in 1.

The rigid members 1.2 and 6.7 may be made of gold-5 material -J+, f-blasted, and sintered material 11.

〔effect〕

As explained above, according to the present invention, in a vibration isolating rubber in which an elastic rubber body is mounted between rigid members, one or both of the ends of the opposing rigid members are moved in a direction in which they are separated from each other. Since the elastic rubber body is expanded and the elastic rubber body is attached to the expanded part, the elastic rubber body positioned in the expanded part, that is, the frontage of the elastic rubber body, will not pop out when external force is applied.
It becomes smaller, and the local distortion also becomes smaller. Therefore, under the same load, the deflection does not change and the spring constant does not decrease. In addition, the amount of elastic rubber used is only marginally increased compared to conventional products, so the loss is increased by 1-! 1. It's not like J5. 3.

[Brief explanation of drawings]

1 is a sectional view showing a preferred embodiment of the present invention, FIG. 2 is a front view, and FIG. 3 is a partially enlarged sectional view of FIG.
Fig. 4 is a graph showing a comparison of local distortion between the conventional product and the product of the present invention, Fig. 5 is a cross-sectional view illustrating the state in which an external force is applied to the external force, and Fig. 6 is a cross-sectional view showing another example. , FIG. 7 is a graph showing the load-bearing performance of the inventive product shown in FIG. 6 and the conventional product, FIG. 8 is a front view showing yet another embodiment, and FIG. 9 is a sectional view showing the conventional example. It is. 1.2, 6.7... Rigid member, 3...
Elastic rubber body, 4... Expansion part. Applicant Brideston Co., Ltd. Agent Patent Attorney Masu 1) Take Daidai ・1 Figure 2 Zukyo!・2 Figure 4% 400 Mainly Figure 3 Figure 5

Claims (1)

[Scope of Claims] 1. In a vibration isolating rubber in which an elastic rubber body is installed between rigid members, one or both of the ends of the opposing rigid members expand in a direction away from each other, Anti-vibration rubber characterized by having an elastic rubber body attached to the expansion part.