The present invention relates to a vibration-proofing apparatus, which is employed at, for example, a vehicle, building machinery, general industrial machinery or the like and which absorbs vibrations from a vibration-generating portion, and a fabrication method thereof. Particularly, it relates to a vibration-proofing apparatus which prevents the generation of looseness, abnormal noises and the like, and a fabrication method thereof.
Heretofore, between an engine which acts as a vibration-generating portion of a vehicle and a vehicle body which acts as a vibration-receiving portion, a vibration-proofing apparatus which serves as an engine mount has been provided. This vibration-proofing apparatus absorbs vibrations generated by the engine, prevents transmission to the vehicle body side, and improves riding comfort. Such a vibration-proofing apparatus is ordinarily composed of: a mounting fixture, which is joined to either one of the vibration-generating portion and the vibration-receiving portion; an outer casing fixture made of resin, which is joined to the other of the vibration-receiving portion and the vibration-generating portion; and a rubber resilient body fixed between the mounting fixture and the outer casing fixture. Now, in recent years, in accordance with demands for cost reductions, weight reductions and the like, vibration-proofing apparatuses in which the outer casing fixture, which has conventionally been made of metal, is made of resin instead have been developed.
However, when an outer casing member made of resin is used, differently from the case of an outer casing fixture made of metal, it is not possible to vulcanization-adhere the rubber resilient body to the outer casing member. Therefore, as shown in
Thus, in the conventional vibration-proofing apparatus shown in
However, in resin-molding of the outer casing member 2, contraction of the resin may be a problem. That is, if the outer casing member 2 made of resin contracts, a gap may occur between the outer casing member 2 and the insert fixture 3. The occurrence of looseness at the insert fixture 3 and the generation of abnormal noises and the like because of this gap are a cause of concern.
Accordingly, the present invention has as an objective the provision of a vibration-proofing apparatus which is capable of reliably preventing occurrences of looseness, abnormal noises and the like and a fabrication method thereof, even if, responding to demands for cost reduction, weight reduction and the like by employing an outer casing member made of resin, the outer casing member is unadhered.
The present invention has been devised in order to solve the problem described above, and the substance thereof relates to a vibration-proofing apparatus composed of: a mounting fixture, which is joined to either one of a vibration-generating portion and a vibration-receiving portion; an outer casing member made of resin, which is joined to the other of the vibration-receiving portion and the vibration-generating portion; and a rubber resilient body, which is fixed between the mounting fixture and an insert fixture, the insert fixture being arranged along an inner peripheral face of the outer casing member, and the rubber resilient body being attached to the outer casing member via the insert fixture by the outer casing member being inserted between insert fixing portions, in which vibration-proofing apparatus a buffer material is interposed between the outer casing member and the insert fixture.
Further, it relates to a vibration-proofing apparatus in which, preferably, the buffer material is composed of the same rubber as the rubber resilient body and, more preferably, a hole is provided in the insert fixture, and the rubber resilient body and buffer material are integrated by the hole.
Further, another substance of the present invention relates to a fabrication method of a vibration-roofing apparatus which is composed of: a mounting fixture, which is joined to either one of a vibration-generating portion and a vibration-receiving portion; an outer casing member made of resin, which is joined to the other of the vibration-receiving portion and the vibration-generating portion; and a rubber resilient body, which is fixed between the mounting fixture and an insert fixture, the insert fixture being arranged along an inner peripheral face of the outer casing member, and the rubber resilient body being attached to the outer casing member via the insert fixture by the outer casing member being inserted between insert fixing portions, the vibration-proofing apparatus fabrication method being: preparatorily inserting the insert fixture in a mold for molding of the rubber resilient body, or employing the insert fixture itself as a portion of the mold; causing raw rubber of the rubber resilient body to be packed around a surface of the insert fixture and forming a buffer material, which is composed of the same rubber as the rubber resilient body, integrally at the surface of the insert fixture; thereafter, arranging the insert fixture in a mold at which a cavity corresponding to a shape of the outer casing member is formed; and, by injecting resin into the mold and forming the outer casing member, causing the buffer material to be interposed between the outer casing member and the insert fixture.
Further, it relates to a vibration-roofing apparatus fabrication method in which, preferably, a hole is provided in the insert fixture, and the raw rubber passes through the hole and is packed around the surface of the insert fixture.
A vibration-proofing apparatus of the present invention is an apparatus composed of a mounting fixture joined to either one of a vibration-generating portion and a vibration-receiving portion, an outer casing member joined to the other of the vibration-receiving portion and the vibration-generating portion, and a rubber resilient body. That is, because of vibration-proofing effects of the rubber resilient body, the apparatus features a damping function and an isolation function with respect to inputs of vibrations. The apparatus is between, for example, an engine which acts as the vibration-generating portion of a vehicle and a vehicle body which acts as the vibration-receiving portion, and absorbs vibrations generated by the engine and blocks transmission to the vehicle body side. Thus, the vibration-proofing apparatus of the present invention exhibits similar characteristics to a conventional apparatus in regard to inputs of vibrations during load-bearing.
Further, in the vibration-proofing apparatus of the present invention, the outer casing member is made of resin. That is, the outer casing fixture, which would conventionally be made of metal, is made of resin instead. Hence, a cost reduction, a weight reduction and the like are anticipated. Herein, because of the impossibility of vulcanization-adhering the rubber resilient body to the outer casing fixture made of resin, the rubber resilient body is vulcanization-adhered between the mounting fixture made of metal and the insert fixture, and the insert fixture is arranged along an inner peripheral face of the outer casing member. Thus, the rubber resilient body is attached to the outer casing member via the insert fixture.
In this case, if a contraction of the resin occurs in resin-molding of the outer casing member, a gap will occur between the outer casing member and the insert fixture, and looseness, abnormal noises and the like may be generated because of this gap. Accordingly, specifically to the present invention, a buffer material is interposed between the outer casing member and the insert fixture. Thus, even if a contraction occurs at the outer casing member made of resin, because of the presence of the buffer material, a gap will not occur between the outer casing member and the insert fixture.
Herein, rubber is suitable as the buffer material. In particular, employing the same rubber as the rubber resilient body and forming a rubber layer at an outer peripheral face of the insert fixture is preferable. That is, the rubber resilient body is ordinarily vulcanization-adhered between the mounting fixture and the insert fixture and, at this time, the insert fixture is preparatorily inserted into a mold for molding of the rubber resilient body, or the insert fixture itself is employed as a portion of the mold. Thus, vulcanization-adhesion is implemented simultaneously with curing of raw rubber in the mold. Further, if this raw rubber is packed around a surface of the insert fixture, it is possible to obtain the buffer material simply.
For example, if a hole is provided in the insert fixture, the raw rubber passes through this hole and is packed around the surface of the insert fixture, and the rubber layer is formed simultaneously with molding. Accordingly, the rubber resilient body and the buffer material will be integrated by the hole of the insert fixture.
Herebelow, a concrete example of a preferable embodiment of the present invention will be described in accordance with the drawings.
Further, between the mounting fixture 1 and the insert fixture 3, a rubber resilient body 4 of NR-type rubber is fixed by vulcanization-adhesion. This rubber resilient body 4 is vulcanization-adhered with the mounting fixture 1 and the insert fixture 3 in a mold for molding and, at this time, because a hole 3A is provided in the insert fixture 3, raw rubber passes through the hole 3A and is packed around a surface of the insert fixture 3. Consequently, a buffer material 5 composed of the same rubber as the rubber resilient body 4 will be integrally formed at the surface of the insert fixture 3.
Then, as shown in
The vibration-proofing apparatus of the present invention is composed of: a mounting fixture, which is joined to either one of a vibration-generating portion and a vibration-receiving portion; an outer casing member made of resin, which is joined to the other of the vibration-receiving portion and the vibration-generating portion; and a rubber resilient body, which is fixed between the mounting fixture and an insert fixture, the insert fixture being arranged along an inner peripheral face of the outer casing member, and the rubber resilient body being attached to the outer casing member via the insert fixture, in which vibration-proofing apparatus a buffer material is interposed between the outer casing member and the insert fixture. Thus, in addition to effects of cost reduction, weight reduction and the like due to the outer casing member 2 being made of resin, it is possible to reliably prevent the generation of looseness, abnormal noises and the like, even though the outer casing member is unadhered. Further, according to the vibration-proofing apparatus fabrication method of the present invention, a vibration-roofing apparatus as described above can be fabricated simply.
Number | Date | Country | Kind |
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2003-073164 | Mar 2003 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/JP04/03628 | 3/18/2004 | WO | 7/5/2006 |