JP3805608B2 - Cylindrical vibration isolator - Google Patents

Description

[0001]
The present invention relates to a cylindrical vibration isolator such as a rear engine mount, which is interposed between a vibrating body and a base to prevent vibration transmission.
[0002]
[Prior art]
FIG. 5 shows a general structure of a conventional rear engine mount, in which an anti-vibration rubber body 3 is disposed between an outer cylinder member 1 and an inner cylinder member 2 arranged substantially concentrically. The anti-vibration rubber body 3 is substantially bowl-shaped and is provided so as to cross the cylinder of the outer cylinder member 1, and the inner cylinder member 2 penetrates through the substantially central portion of the anti-vibration rubber body. The inner cylinder member is connected to an engine that is a vibrating body, and the outer cylinder member 1 is held in a cylindrical bracket and connected to a vehicle body that is a base, and the vibration-proof rubber body 3 is elastically deformed when vibration is input to reduce vibration. It ’s like that.
[0003]
On the inner peripheral surface of the outer cylindrical member 1, rubber stopper portions 5 and 5 'that face the vibration-proof rubber body 3 at a predetermined interval are provided. Among these, the stopper part 5 is for preventing excessive displacement of the anti-vibration rubber body 3 at the time of starting backward, and the stopper part 5 'is for limiting the amount of displacement due to rebounding at that time.
[0004]
[Problems to be solved by the invention]
In recent years, effective utilization of the space around the engine has become a major issue for various reasons such as an increase in vehicle-mounted components and a reduction in vehicle size. For this reason, it is required that the rear engine mount further suppresses the displacement at the time of starting backward, and reliably prevents interference between the engine and peripheral members even when the space in the engine room is limited. Accordingly, the present inventors, as means for responding to this requirement, (1) increase the thickness of the rebound side stopper portion 5 ', and (2) insert a resin insert member on the rebound side stopper portion 5'. It was considered to bury.
[0005]
However, with the means (1), a sufficient effect of suppressing displacement cannot be obtained due to insufficient rigidity, and with the means (2), the insert member is deformed at the time of molding, causing a problem in the shape of the stopper portion. did.
[0006]
The present invention has been made in view of the above circumstances, and an object of the present invention is to enhance the stopper function of the stopper portion on the rebound side without reducing moldability in the cylindrical vibration damping device applied to the rear engine mount. Thus, the amount of displacement at the time of starting backward is suppressed within a predetermined range, and interference with other members is reliably prevented.
[0007]
[Means for Solving the Problems]
In order to solve this object, a cylindrical vibration isolator according to claim 1 is provided with a vibration isolating rubber body disposed across a cylinder of a substantially circular outer cylinder member, and a substantially central portion of the vibration isolating rubber body is disposed on the center. An inner cylinder member that penetrates and is positioned substantially concentrically with the outer cylinder member is provided, and a stopper portion that is joined to the inner peripheral surface of the outer cylinder member and faces the vibration isolating rubber body at a predetermined interval is provided. Become. And the said stopper part is comprised by the insert member which has a substantially circular arc-shaped surface along the internal peripheral surface of the said outer cylinder member, and the rubber layer which covers the surface of this insert member, and the said insert member, An end surface following the substantially arc-shaped surface is inclined inward with respect to a line connecting both ends of the arc and the center of the outer cylinder member.
[0008]
When the stopper portion is molded, the inner and outer cylinder members and the insert member are placed in a molding die, and the rubber material to be the vibration-proof rubber body and the rubber layer is injected. The rubber material flows along the inner peripheral surface of the outer cylinder member, and at the end of the insert member, the inner surface (the surface on the inner cylinder member side) side and the outer surface (the surface on the outer cylinder member side). However, depending on the shape of the insert member, the insert member may be deformed by the rubber flow. On the other hand, in the present invention, since the end surface that follows the substantially arc-shaped outer surface of the insert member where the rubber flow is divided is inclined inward, the rubber flow is not blocked by the end surface of the insert member. , Can prevent deformation. And by this insert member, while raising the rigidity of the above-mentioned stopper part, since the above-mentioned insert member was arranged in the shape of a circular arc along the inner peripheral surface of the above-mentioned outer cylinder member, it can exhibit a stopper function in a wide range. It is possible to reliably suppress the displacement of the vibration-proof rubber body.
[0009]
Specifically, as described in claim 2, the insert member can be formed in a substantially arch shape, and the end surfaces of both legs can be formed into a horizontal plane or a plane inclined from the horizontal plane toward the inside of the arch. By making the insert member substantially arch-shaped and covering the surface with the rubber layer, a stopper portion having an excellent stopper function can be realized in a wide angle range. Further, if the both end surfaces are horizontal surfaces or surfaces inclined more inwardly, the rubber material smoothly flows from the both end portions of the insert member to the inner and outer surfaces, and deformation does not occur.
[0011]
According to a third aspect of the present invention, the stopper portion can be formed integrally with the vibration isolating rubber body, and the manufacturing process can be simplified.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 (a) and 1 (b) are overall configuration diagrams of a rear engine mount to which the present invention is applied. The rear engine mount has a metal outer cylinder member 1 and an inner cylinder member 2 arranged substantially concentrically. 2 is embedded in a substantially central portion of a vibration-proof rubber body 3 disposed across the cylinder of the outer cylinder member 1. The outer cylinder member 1 has a circular cross-sectional shape, and an anti-vibration rubber body 3 formed in a substantially bowl shape is bridged between the opposed inner peripheral surfaces, and both ends of the anti-vibration rubber body 3 are connected to the outer cylinder member 1. Each is joined to the inner peripheral surface.
[0013]
A stopper portion 5 made of a rubber member having a chevron-shaped cross section extends in the axial direction along the inner peripheral surface of the outer cylinder member 1 between both leg portions of the vibration isolating rubber body 3. Further, a stopper portion 4 extending in the axial direction along the inner peripheral surface of the outer cylinder member 1 is provided on the top side of the vibration-proof rubber body 3. The top of the anti-vibration rubber body 3 has a semicircular shape that covers the upper half of the inner cylinder member 2, and the stopper portion 4 has an arcuate shape that opposes it at a predetermined interval. These stopper portions 4 and 5 prevent excessive deformation of the vibration-proof rubber body 3 in the radial direction (vertical direction in the figure). In the rear engine mount, normally, the amount of displacement at the time of backward start is restricted by the stopper portion 5 and the amount of displacement by rebound at the time of backward start is restricted by the stopper portion 4 within a predetermined range.
[0014]
The stopper portion 4 includes an insert member 41 made of resin or the like and a rubber layer 42 covering the surface thereof. The insert member 41 is formed in a substantially arch shape, and has a substantially arc-shaped outer surface along the inner peripheral surface of the outer cylinder member 1. The inner surface on the inner cylinder member 2 side has a similar substantially arc shape. Further, as shown in FIGS. 2A to 2C, the insert member 41 is formed with three through holes 43 for turning the rubber at substantially equal intervals. Thereby, since the rubber layer 42 covering the inner and outer surfaces is integrated through the through hole 43, the adhesion with the rubber layer 42 can be improved.
[0015]
Further, according to the present invention, the end surface following the substantially arc-shaped outer surface of the insert member 41, that is, the both end surfaces 44 of the arch are connected to both ends of the arc, that is, the end surface on the outer surface side, and the outer cylinder member 1. It is made to incline inside with respect to the line B which connects the center of. In the present embodiment, as shown in FIG. 2 (b), both end faces 44 are horizontal. Thereby, at the time of shaping | molding of the rubber layer 42, a rubber material flows smoothly from the both ends of the arch of the insert member 41 to an inner surface side, and a moldability improves. This will be described later.
[0016]
In the present embodiment, both end surfaces 44 are horizontal surfaces, but can be further inclined toward the inside of the arch. Of course, if it is inside the line B, it may be inclined slightly outward from the horizontal plane, but as the inclination angle toward the inside increases, the rubber flows more easily, which has the effect of improving the moldability. high.
[0017]
The stopper portions 4 and 5 are formed integrally with the vibration-proof rubber body 3. Since the anti-vibration rubber body 3 contracts after molding, the entire outer cylinder member 1 is usually drawn as shown in FIG. 1C in order to remove the distortion. Subsequently, the whole is press-fitted and fixed in the cylindrical portion of the bracket 6 shown in FIG. Assembling is performed by fixing the bracket 6 to the vehicle body (not shown) with a bolt and a bolt (not shown) inserted into the cylinder of the inner cylinder member 2 to the engine side member (not shown). .
[0018]
Next, FIG. 4 demonstrates the improvement effect of the moldability by the insert member 41 of the said embodiment compared with insert member 41 'from which edge part shape differs. 4A shows the insert member 41 of the present invention, and the upper figure shows a comparative insert member 41 ′ having the same arch shape but with the end surface 44 ′ as a vertical surface instead of a horizontal surface. Here, when the stopper portions 4 and 5 and the vibration isolating rubber body 3 are integrally molded, the inner and outer cylindrical members 1 and 2 and the insert member 41 are arranged in the mold, and usually in the vicinity of the stopper portion 5. A rubber material is injected from an injection gate provided. As shown in FIG. 4B, the rubber material flows along the inner peripheral surface of the outer cylinder member 1 and is diverted toward the inner and outer surfaces at both ends of the insert member 41.
[0019]
At this time, as shown in the upper diagram of FIG. 4B, when the comparative insert member 41 ′ is used, the end surface 44 ′ as a vertical surface is positioned so as to block the rubber flow, so The rubber flow is directed toward the center of the outer cylinder member 1, and the end of the insert member 41 ′ is deformed by the molding pressure. On the other hand, when the insert member 41 of the present embodiment is used as shown in the lower diagram of FIG. 4B, the end surface 44 is a horizontal surface, so that the rubber flow is not blocked and the insert member 41 is It flows so as to press against the member 1 side. Therefore, the insert member 41 is not deformed, and the moldability can be improved. Moreover, since the rubber material flows so as to be pressed against the outer cylinder member 1, the adhesion is improved. Providing a plurality of through holes 43 for turning the rubber also has an effect of further improving the adhesion. The inclination angle of the end face 44 (angle with respect to a line connecting the edge of the arc and the center of the outer peripheral member) is preferably 10 to 70 °, and particularly preferably 20 to 60 °.
[0020]
Further, in the present invention, the stopper portion 4 is provided in a wide arc shape so as to face the semicircular top portion of the vibration isolating rubber body 3, and an arch-like insert member 41 is embedded in almost the whole to provide rigidity. Is increasing. Therefore, even if the rebound input angle at the time of starting backward is slightly deviated, the effect of suppressing the displacement of the anti-vibration rubber body 3 can be obtained by reliably acting the stopper function. Therefore, since interference with other members can be prevented, there are effects such as effective use of the engine room and downsizing of the vehicle.
[0021]
In the above embodiment, the insert member is made of resin, but may be made of metal or the like. Further, the inner surface of the insert member does not necessarily have a substantially arc shape, and the inner surface of the insert member may be changed as necessary, such as a flat surface or a slightly thicker central portion to increase rigidity. be able to.
[Brief description of the drawings]
1A and 1B show a first embodiment of the present invention, in which FIG. 1A is an overall cross-sectional view of a cylindrical vibration isolator, FIG. 1B is a cross-sectional view taken along line AA in FIG. It is a whole sectional view of a cylinder type vibration isolator after processing.
2A is a plan view of an insert member used in the first embodiment, FIG. 2B is a side view, and FIG. 2C is a front view.
FIG. 3 is a view showing a state in which the cylindrical vibration isolator of the first embodiment is assembled to a bracket.
4A and 4B are views for explaining the effects of the present invention, and FIG. 4A is a side view showing a comparison between the shape of the comparative insert member and the shape of the insert member used in the first embodiment; ) Is a view showing a state of rubber flow when each insert member is used.
FIG. 5 is an overall cross-sectional view of a conventional cylindrical vibration isolator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outer cylinder member 2 Inner cylinder member 3 Anti-vibration rubber 4 Stopper part 41 Insert member 42 Rubber layer 43 Through hole 44 End surface 5 Stopper part 6 Bracket

Claims (3)

  An anti-vibration rubber body is disposed across the cylinder of the substantially circular outer cylinder member, and an inner cylinder member that is positioned substantially concentrically with the outer cylinder member is provided through the substantially central portion of the anti-vibration rubber body. In addition, in the cylindrical vibration isolator provided with a stopper portion which is joined to the inner peripheral surface of the outer cylinder member and faces the vibration isolating rubber body at a predetermined interval, the stopper portion is connected to the inner periphery of the outer cylinder member. An end member that has a substantially arcuate surface along the surface and a rubber layer that covers the surface of the insert member, and an end surface of the insert member that follows the substantially arcuate surface is an end of the arc. A cylindrical vibration isolator which is inclined inward with respect to a line connecting an edge and the center of the outer cylinder member.   The cylindrical vibration isolator according to claim 1, wherein the insert member is formed in a substantially arch shape, and both leg end surfaces are inclined in a horizontal plane or a plane inclined from the horizontal plane toward the inside of the arch. The cylindrical vibration isolator according to claim 1 or 2 , wherein the stopper portion is formed integrally with the vibration isolating rubber body .

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