JP2009228697A - Vibration damping rubber unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration damping rubber unit having a simple structure, stably acting, and capable of certainly obtaining a vibration damping effect even if a load is greatly changed. <P>SOLUTION: Plural kinds of rubber materials 1, 2 having different hardness are combined. The height of the rubber material 1 having low hardness is made high, and the height of the rubber material 2 having high hardness is made low. Base ends of the rubber materials 1, 2 are aligned on one article side, and tip ends of the rubber materials 1, 2 are turned to the other article side. A clearance is provided between outer peripheries of the rubber materials 1, 2. When a load is small, only rubber material 1 which is low in hardness and high in height is bent, thereby showing the vibration damping effect by a small spring constant. When the load becomes large, the rubber material 2 which is high in hardness and low in height is also bent, thereby showing the vibration damping effect by a large spring constant. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vibration isolating rubber unit that is interposed between objects and prevents transmission of vibration from one object to the other object.

  For example, in recent railway vehicles, anti-vibration rubber is interposed between the underframe of the vehicle body and the upper floor in order to mitigate vibrations and shocks transmitted into the vehicle during traveling. The number of passengers varies greatly depending on the belt, day of the week, season, etc., and the load acting on the anti-vibration rubber has a characteristic that changes greatly.

  Under these conditions, if the anti-vibration rubber has a small spring constant in accordance with the low number of passengers, the amount of deflection will be too great during crowding when a large load is applied, resulting in a sufficient anti-vibration effect. Not only cannot be obtained, but the vibration-proof rubber itself may be destroyed.

  On the other hand, if the spring constant is set to a large value when the number of passengers is large, the amount of bending may be small and the vibration-proofing effect may be hardly obtained when the number of passengers is small and the load is small. .

  As a countermeasure, in Patent Document 1 shown below, as shown in FIG. 5, a protruding member 52 provided on the lower surface of the upper floor B is inserted between a pair of holding members 51 provided on the upper surface of the underframe A, and the opposite of them. A tapered surface 51a, 52a is formed on the surface, and a rubber material 53 is fitted between the tapered surface 51a, 52a and the lower end of the protruding member 52 and the frame A. .

  In such an anti-vibration rubber unit, if the load is small, the inclined portion 53a of the rubber material 53 is sheared and deformed to absorb vibration, and when the load is large, the horizontal portion 53b below the rubber material 53 is compressed and deformed. Because vibration is absorbed, even if the load changes greatly, it is said that an anti-vibration effect can be obtained.

JP-A-2005-67219

  However, the anti-vibration rubber unit described in Patent Document 1 has a problem in that the rubber material 53 has to be processed into a complicated shape at the time of manufacture, which requires a cost for manufacture.

  Further, in use, friction is generated between the tapered surfaces 51a and 52a and the rubber material 53, and there is a possibility that the operation is not smooth.

  Therefore, the present invention is intended to provide a vibration isolating rubber unit that has a simple structure, operates stably, and can reliably obtain a vibration isolating effect even when the load changes greatly.

  In order to solve the above problems, the present invention provides a plurality of types of rubber materials having different hardnesses in an anti-vibration rubber unit that is interposed between objects and prevents transmission of vibration from one object to the other by a rubber material. The rubber material with low hardness is set high, the rubber material with high hardness is set low, the base ends of these rubber materials are aligned on one object side, and the rubber materials on the other object side are aligned. The tip is directed and a gap is provided between the outer circumferences of the rubber material.

  In the state of use, if the load is small, only the rubber material with low hardness and low height will bend, and the anti-vibration effect will be exhibited with a small spring constant. Thus, the vibration-proof effect is exhibited with a large spring constant.

  In the anti-vibration rubber unit according to the present invention, since the rubber materials having different hardness and height are independent, the manufacture is facilitated, and various rubber materials are stepped in response to changes in the load in use. Even if the rubber material is bent, it does not interfere with each other even if it is bent, so that a stable vibration-proofing effect can be obtained regardless of changes in load.

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

  As shown in FIGS. 1 and 2, the vibration-proof rubber unit according to the first embodiment includes a cylindrical rubber material 2 having a short height around a columnar rubber material 1 having a high height. The rubber material 1 has a low hardness, and the rubber material 2 has a high hardness.

  The base ends below the rubber materials 1 and 2 are aligned and fixed to the substrate 3, and the top plate 4 and the top plate 5 of the ring are fixed to the top ends of the rubber materials 1 and 2, respectively. Has been. A space is provided between the outer peripheries of the rubber materials 1 and 2.

  Round holes 3 a for inserting fixing bolts to one object are provided at the four corners of the substrate 3, and fixing bolts 4 a to the other object are attached to the center of the top plate 4.

  When such an anti-vibration rubber unit is installed, for example, between the underframe of the railcar body and the upper floor, as shown in FIG. Fix the top floor B on the top plate 4 and fix it with bolts and nuts.

  When installed in this manner, when the number of passengers is small and the load is small, as shown in FIG. 3 (a), only the rubber material 1 is bent, and the anti-vibration effect is exhibited with a small spring constant.

  On the other hand, when the number of passengers is large and the load is heavy, as shown in FIG. 3B, in addition to the rubber material 1, the rubber material 2 also bends and exhibits an anti-vibration effect with a large spring constant.

  At this time, the amount of bending of the rubber material 1 is suppressed by the rubber material 2, so that the rubber material 1 is not excessively bent and the vibration isolating effect is not reduced or the rubber material 1 is not destroyed.

  Further, since the rubber materials 1 and 2 are bent and do not interfere with each other due to the gap provided between the rubber materials 1 and 2, it is possible to cope with a large load change with a stable operation.

  The shape of the anti-vibration rubber materials 1 and 2 is not limited to the shape as described above. For example, as in the second embodiment shown in FIG. It is good.

  In each of the above embodiments, two types of rubber materials having different hardness and height are provided. However, three or more types of rubber materials having different hardness and height are provided, and these are bent stepwise to prevent vibration. You may make it show an effect.

  In addition to the railcar, this anti-vibration rubber unit can be applied to various things whose load changes greatly, such as a stage where a play or the like is performed, and a reliable anti-vibration effect can be obtained.

The perspective view of the vibration isolator rubber unit which concerns on 1st Embodiment Longitudinal sectional view showing the installation state (A) Schematic longitudinal sectional view showing a state where the load is small, (b) Schematic longitudinal sectional view showing a state where the load is large The perspective view of the vibration isolator rubber unit which concerns on 2nd Embodiment A perspective view showing a conventional anti-vibration rubber unit

Explanation of symbols

1, 2 Rubber material 3 Substrate 4, 5 Top plate A Underframe B Upper floor

Claims (1)

  In an anti-vibration rubber unit that is interposed between objects and prevents the transmission of vibration from one object to the other by a rubber material, combine multiple types of rubber materials with different hardnesses, Set the back of high and high hardness rubber material low, align the base end of these rubber materials on one object side, and make the tip of these rubber materials face the other object side, between the outer circumferences of the rubber materials An anti-vibration rubber unit characterized by having a space in between.

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