JP2006275203A - Vibration-proofing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent residual strain from remaining, by taking into consideration a vulcanization place, though metal and a rubber elastic body are joined by vulcanization adhesion superior in operational processability, in a vibration-proofing device composed of the metal and the rubber elastic body. <P>SOLUTION: This vibration-proofing device is formed for storing the rubber elastic body 2 in an outside member 3, by vulcanizing and adhering the rubber elastic body 2 to the outer periphery of an inside member 1. The vibration-proofing device is characterized in that the outside member 3 is composed of a lower outside member 9 for wrapping a lower part of the rubber elastic body 2 and an upper outside member 10 integrated with the lower outside member 9 by wrapping an upper part, and the rubber elastic body 2 and the lower outside member 9 are vulcanized and adhered. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vibration isolator used for an engine mount of an automobile.

  As an engine mount of an automobile, a bush type type in which a rubber elastic body is interposed between an inner cylinder and an outer cylinder is common, but this type of thing has a rubber elastic body as an inner cylinder and an outer cylinder. There is a problem in that residual strain due to shrinkage occurs due to vulcanization and confinement. For this reason, it is necessary to perform a drawing process to remove the residual strain before press-fitting the outer cylinder into the housing, resulting in a disadvantage that the cost is increased.

Therefore, as seen in Patent Documents 1 and 2 below, the rubber elastic body is vulcanized and bonded only to the inner cylinder or the inner member, and mechanically coupled to the outer cylinder or the outer member by some means. Measures have been taken. According to this, although the residual strain does not remain, there is a problem that it is difficult to connect the elastic elastic body with deformability to a rigid body such as metal. In Patent Documents 1 and 2 described above, measures are taken such that a protruding portion is formed on a rubber elastic body, and this is clamped and held and fixed by a rigid body, which presents difficulty and troublesome processing. In addition, the rubber is left unilaterally deformed, and the characteristics of the rubber are lost. Furthermore, since measures such as clamping with a rigid body and fixing with holding are taken, the vibration isolator itself becomes large, and there is also a problem in accommodating it in a narrow engine room.
JP-A-8-296681 JP 2003-202053 A

  By the way, as means for joining rubber and a rigid body such as metal, vulcanization adhesion is reliable and has a very excellent aspect of being simple. The present invention pays attention to such advantages and pays attention to the member to be vulcanized and its portion so as not to cause residual strain. Thus, it is possible to realize a compact vibration isolator that does not cause a failure or the like.

  Under the above-described problems, the present invention provides a vibration isolator in which a rubber elastic body is vulcanized and bonded to the outer periphery of the inner member and the rubber elastic body is accommodated in the outer member. A lower outer member that wraps the lower part of the elastic body and an upper outer member that wraps the upper part and is integrated with the lower outer member, and the rubber elastic body and the lower outer member are vulcanized and bonded. In addition to providing a vibration isolator, the lower outer member according to claim 2 has a substantially flat plate body along the bottom surface of the rubber elastic body, and the upper surface and the bottom surface of the flat plate body are vulcanized and bonded. Provide a means.

  In the above vibration isolator, the both sides of the rubber elastic body according to claim 3 are standing walls standing upright from the bottom surface, and the inclined walls are inclined from the upper end of the standing wall toward the narrow side and reach the top surface. 5. A lower portion according to claim 4, wherein the lower outer member has a width formed by forming a step at a predetermined distance from the boundary between the standing wall and the inclined wall. Provided is a means in which a protrusion extending in the front-rear direction is formed in the central portion of the outer member, and a slack extending in the direction of the protrusion is formed in a rubber elastic body in an upper portion of the protrusion.

  According to the means of claim 1, the rubber elastic body is vulcanized and bonded only to the inner member and the lower outer member, and the upper outer member only surrounds the rubber elastic body. Are not consolidated. Therefore, even when the rubber elastic body is accommodated in the upper outer member, no residual strain is generated in the rubber elastic body. In addition, vulcanization bonding is easy to operate and the shape of the bonding surface is free. At this time, according to the means of claim 2, since the flat plate and the end surface of the rubber elastic body are vulcanized and bonded, the treatment is simple.

  In addition, when a rubber elastic body is clamped with a rigid body and mechanically coupled, a structure that takes into account retaining and positional deviation must be taken, and the shape is complicated accordingly, but in this way If vulcanized, such considerations are unnecessary, and the degree of freedom in shape design increases. This means that the structure is simple and the whole is compact, and there is no damage from the rubber elastic body due to pinching and holding, and no drop off from the holding member due to wear. Further, the degree of freedom of deformation of the rubber elastic body at the time of vibration input is increased, and the durability is improved.

  As described above, since it is not necessary to consider the rubber elastic body retaining with respect to the vibration input direction, it is possible to adopt the means of claim 3. In this way, the length of the gap is adjusted. Since the amplitude can be adjusted, the spring ratio can be changed variously. That is, it can be said that the range of tuning elements that determine the characteristics of the spring is wide. Furthermore, according to the means of claim 4, the softness of the spring, which is important for vibration absorption, can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this example, an engine mount for an automobile is taken as an example of the vibration isolator. FIG. 1 is a partially sectional front view of the vibration isolator, FIG. 2 is a partially sectional side view, and FIG. 3 is a partially sectional plan view. 4 is a partial cross-sectional front view of the inner member and the rubber elastic body, and FIG. 5 is also a partial cross-sectional plan view. This anti-vibration device is made of a metal inside connected to the engine (not shown) side. A member 1, a rubber elastic body 2 in which the inner member 1 is inserted and vulcanized and bonded, and a metal outer member 3 that accommodates the rubber elastic body 2 and is fixed to the frame (not shown) side of the automobile Become.

  In addition, although the inner member 1 of this example is a square bar having a quadrangular cross section, it may be a thick steel pipe (1a is a hole or a long hole for fixing). The rubber elastic body 2 of this example has a substantially rectangular shape with a predetermined thickness (dimension in a direction perpendicular to the paper surface) in front view of FIG. 1. From the upper end of the upright wall 5, the inclined wall 6 is inclined to the narrow side and reaches the top surface 7. The inner member 1 is inserted into the center of the portion surrounded by the inclined wall 6 of the rubber elastic body 2 in the front-rear direction (direction perpendicular to the paper surface) and vulcanized and bonded. Further, in the central portion below the inner member 1, a mountain-shaped blank 8 in front view is penetrated in the front-rear direction so as to soften the spring and improve the vibration-proof property.

  The outer member 3 of this example includes a lower outer member 9 that wraps the lower part of the rubber elastic body 2 and an upper outer member 10 that wraps the upper part. In the present invention, the lower outer member 9 and the rubber elastic body 2 are coupled by vulcanization adhesion. The form of this vulcanization adhesion is not limited, but considering the ease of operation, it is suitable that vulcanization adhesion is performed on one side. The lower outer member 9 of this example has a flat plate shape as a basic form, but is formed with a ridge 13 protruding upward to the bottom of the shading 8 at the center, and extends back and forth. The ridges 13 increase the strength of the lower outer member 9 and play a role of a stopper against the vertical input of vibration, and improve the durability of the rubber elastic body 2.

  The upper outer member 10 wraps the upper part of the rubber elastic body 2. However, in this example, the lower outer member 9 is basically a flat plate so that the upper side is covered from the side of the rubber elastic body 2. It is in a form to be covered. For this reason, the upper outer member 10 of this example has a hat shape in which the arch portion 15 rises on the center side of the leg portion 14, and the leg portion 14 is overlapped on the end portion 11 of the lower outer member 9 and caulked. Etc. are integrated together.

  In addition, a hole or a long hole 16 through which a mounting bolt or the like is appropriately passed is formed in the leg portion 14 or the like. Furthermore, in this example, the arch portion 15 of the upper outer member 10 is narrowed down by forming a step 17 at a predetermined height S from the boundary between the standing wall 5 and the inclined wall 6 of the rubber elastic body 2. Yes. Therefore, the gap 18 is formed in the portion having the predetermined height S. Since the step 17 forms a kind of stopper, the spring ratio and the position of the stopper can be adjusted by adjusting S.

  In the above, when the vibration isolator is in an equilibrium (initial) state, the rubber elastic body 2 is such that only the standing wall 5 is in contact with the inner surface of the arch portion 15 of the upper outer member 10, and the other portions are It is in a state of non-connection. That is, the inclined wall 6 and the top surface 7 of the rubber elastic body 2 are not in contact with the upper outer member 10. This is to ensure free deformation at the time of vibration input and to bring out the softness of the spring.

  In addition, in this example, protrusions are formed on the contact surface or the contactable surface between the rubber elastic body 2 and the upper outer member 10. In other words, a plurality of first ridges 19 are provided on the inclined wall 6 of the rubber elastic body 2 in the vertical direction, and the first ridges 19 are further extended downward to slightly stand on the standing wall 5. The narrow second protrusion 20 is formed, and the second protrusion 20 is brought into contact with the inner surface of the arch portion 15 of the upper outer member 10 in a slightly crushed state.

  Further, the third protrusion 21 is similarly formed on the top surface 7 of the rubber elastic body 2. By the way, in this example, although the 3rd protrusion 21 is orient | assigned to the front-back direction, it may face to the left-right direction. These protrusions 19 to 21 are for suppressing the noise generated when the upper outer member 10 and the rubber elastic body 2 come into contact with each other by vibration input. In addition, although a protrusion here refers to what a projection body continued, discontinuous (independent) protrusion may be sufficient. The point is that the contact area can be reduced.

  As described above, for example, if the outer member 3 is fixed and the vibrating member is received by the inner member 2, the rubber elastic body 2 connecting the inner member 1 suppresses vibrations caused by the vibrating member. Since the vibration absorption at this time is so large that the spring is soft, the rubber elastic body 2 and a part of the outer member 3 are vulcanized and bonded, but by vulcanization and bonding in a form that does not hinder the softness of the spring. The vibration isolator according to the present invention is excellent.

It is a partial cross section front view of the vibration isolator which concerns on this invention. It is a partial cross section side view of the vibration isolator which concerns on this invention. It is a partial cross section top view of the vibration isolator which concerns on this invention. It is a partial cross section front view of the rubber elastic body of the vibration isolator which concerns on this invention. It is a partial cross section top view of the rubber elastic body of the vibration isolator which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner member 1a Hole or long hole 2 Rubber elastic body 3 Outer member 4 Bottom surface of rubber elastic body 5 Standing wall 6 of rubber elastic body Inclined wall 7 of rubber elastic body Top surface 8 of rubber elastic body Lower body 9 Lower outer member 10 Upper part Outer member 11 End 13 Projection 14 Leg 14 Leg 15 Arch 16 Hole or slot 17 Step 18 Clearance 19 First projection 20 Second projection 21 Third projection

Claims (4)

  In an anti-vibration device in which a rubber elastic body is vulcanized and bonded to the outer periphery of the inner member and the rubber elastic body is accommodated in the outer member, the outer member is divided into a lower outer member that wraps the lower part of the rubber elastic body, and a lower outer part that wraps the upper part. A vibration isolator comprising an upper outer member integrated with a member, and a rubber elastic body and a lower outer member bonded by vulcanization.   2. The vibration isolator according to claim 1, wherein the lower outer member has a substantially flat body along the bottom surface of the rubber elastic body, and the upper surface and the bottom surface of the flat body are vulcanized and bonded.   Both sides of the rubber elastic body are composed of an upright wall standing upright from the bottom surface and an inclined wall inclined from the upper end of the upright wall to the narrow side and reaching the top surface, and the side wall of the upper outer member is formed as an upright wall. The anti-vibration device according to claim 2, wherein a step is formed at a position separated from the boundary of the inclined wall by a gap having a predetermined height to narrow the width.   The vibration isolator according to any one of claims 1 to 3, wherein a ridge extending in the front-rear direction is formed at a central portion of the lower outer member, and a slack extending in the direction of the ridge is formed in a rubber elastic body at an upper portion of the ridge.