JP4412616B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator that is interposed between a vibration generator and a support that supports the vibration generator, and prevents vibration transmission from the vibration generator to the support.

  Conventionally, as such an anti-vibration device, a bracket member attached to either one of a vibration generator and a support that supports the vibration generator, and one of the vibration generator and the support connected to the bracket member. What is provided with the mounting apparatus attached to the other is known. Patent Documents 1 and 2 below disclose an engine mount that prevents vibration transmission from an engine that is a vibration generator to a vehicle body frame that is a support.

  In the vibration isolator, a displacement restricting portion surrounding a part of the bracket member is provided to restrict the relative displacement amount of the bracket member with respect to the mounting device. Thus, when a large vibration is input from the vibration generator, a part of the bracket member comes into contact with the displacement restricting portion and functions as a stopper, and the relative displacement amount of the bracket member with respect to the mounting device is restricted.

By the way, since the bracket member is attached to one of the vibration generator and the support in a state where it is connected to the mount device, the bracket member is formed in various shapes so as to conform to the positional relationship between them. However, if one side in the width direction of the portion not surrounded by the displacement restricting portion is formed to protrude larger than the other side, local stress concentration is likely to occur, and it is difficult to ensure the strength. It tends to be difficult to carry out displacement regulation stably.
JP-A-10-169713 JP-A-11-210812

  The present invention has been made in view of the above circumstances, and the problem is that even when one side in the width direction of the portion not surrounded by the displacement restricting portion of the bracket member is protruded larger than the other side, An object of the present invention is to provide a vibration isolator capable of stably performing displacement restriction while ensuring the strength of a bracket member.

  The above objects can be achieved by the present invention as described below. That is, the vibration isolator according to the present invention includes a bracket member attached to one of a vibration generator and a support that supports the vibration generator, and the vibration generator and the bracket member connected to the bracket member. A mounting device attached to either one of the support, a displacement restricting member that houses and surrounds a part of the bracket member, and a rubber layer that covers an outer peripheral surface of the bracket member surrounded by the displacement restricting member; In the vibration isolator, the bracket member is inserted into an opening opened to the side of the displacement regulating member, and is connected to the mount device, and is wider than the stopper portion and on one side in the width direction. Is formed to protrude larger than the other side, and is attached to either one of the vibration generator and the support, and the opening And extending toward the mounting portion while gradually increasing the width from the stopper portion, and includes an intermediate portion connecting the stopper portion and the mounting portion, and the mounting portion of the opening portion is formed to project. The edge portion on the side is shifted to the stopper portion side.

  In the vibration isolator according to the present invention, the stopper portion of the bracket member is inserted into the opening portion opened to the side of the displacement restricting member, and the stopper portion is surrounded by the displacement restricting member while being connected to the mount device. The bracket member is attached to either the vibration generator or the support at the attachment portion, and this attachment portion is wider than the stopper portion and is formed so as to protrude larger on one side in the width direction than the other side.

  In the present invention, the bracket member includes an intermediate portion that extends toward the mounting portion while gradually increasing the width from the stopper portion, and connects the stopper portion and the mounting portion, thereby preventing local stress concentration. The strength can be suitably secured. In addition, by shifting the edge of the opening on the side where the mounting portion protrudes to the stopper portion side, the intermediate portion whose width gradually increases can be projected from the edge of the opening, and the above shape The displacement of the bracket member can be regulated stably.

  In the above description, the rubber layer has at least an outer peripheral surface of the stopper portion and the opposed portion of the intermediate portion that protrudes from the opening portion toward the attachment portion and faces the intermediate portion from below. It is preferable that the outer peripheral surface facing the surface is covered, and the protruding length of the facing surface on which the mounting portion protrudes is made larger than the other side.

  According to the said structure, the displacement control of a bracket member can be performed more suitably and stably by having the opposing surface which protrudes in the attachment part side rather than an opening part, and opposes a lower part from the downward direction. Furthermore, since the rubber layer covers the outer peripheral surface of the stopper portion and the outer peripheral surface facing the opposing surface of the intermediate portion, damage to the bracket member due to displacement restriction can be reduced well. In addition, by making the protruding length of the side where the mounting portion of the facing surface protrudes larger than the other side, it is possible to ensure the contact area between the intermediate portion and the facing surface, The improvement effect by a rubber layer can be heightened.

  In the above, the stopper portion includes a connecting portion connected to the mounting device, and a protrusion group is provided on an outer peripheral surface of the rubber layer on both sides in the width direction of the connecting portion, and a part of the protrusion group is the displacement What was comprised so that it might be accommodated in the accommodation hole formed in the control member is preferable.

  According to the above configuration, a part of the protrusion group provided on the rubber layer is accommodated in the accommodation hole formed in the displacement regulating member, so that the state before the vibration isolator is attached to the vibration generator or the support body For example, during an accumulation operation or a transportation operation, when an external force is input to the mounting portion, it is possible to prevent a part of the stopper portion from coming out of the displacement regulating member. As a result, when attaching to the vibration generator or the support, the bracket member can be positioned accurately and easily, and workability is improved.

  In addition, since the projection that is not accommodated in the accommodation hole in the projection group is opposed to the inner peripheral surface of the displacement regulating member, in the state where the vibration isolator is attached to the vibration generator or the support body, The hitting sound generated by the collision with the rubber layer can be reduced.

  In the above, it is preferable that protrusions are juxtaposed on the surface of the rubber layer covering the side surface of the stopper portion surrounded by the displacement regulating member. According to such a configuration, since the protrusions juxtaposed on the surface of the rubber layer face the inner peripheral side surface of the displacement regulating member, the vibration isolator is attached to the vibration generator or the support. Further, it is possible to reduce the hitting sound generated by the collision between the displacement regulating member and the rubber layer.

  In the above, the rubber layer is vulcanized and molded separately from the bracket member, and is attached to the outer peripheral surface of the stopper portion, and a convex portion is provided on the inner peripheral surface of the rubber layer. In addition, it is preferable that a concave portion into which the convex portion is fitted is formed on the outer peripheral surface of the stopper portion. According to this configuration, the concave portion that is fitted to the convex portion provided on the inner peripheral surface of the rubber layer is formed on the outer peripheral surface of the stopper portion, so that the rubber is vulcanized and molded separately from the bracket member. It can suppress suitably that a layer slips out from a stopper part.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an example of a vibration isolator according to the present invention. FIG. 2 is an exploded view of the vibration isolator. FIG. 3 is a top view of the bracket member and the upper metal fitting provided in the vibration isolator. FIG. 4 is a side view of the bracket member. FIG. 5 is a bottom view of the bracket member. FIG. 6 is a partial cross-sectional view showing the side surfaces of the bracket member and the upper metal fitting.

  The vibration isolator 1 supports and fixes the engine (corresponding to the vibration generating body) of the FF type automobile so that vibration generated from the engine is not transmitted to the vehicle body frame (corresponding to the supporting body). A bracket member 2 attached to the engine side, a mount device 3 attached to the body frame side, and an upper metal fitting 4 attached to the mount device 3 (corresponding to the displacement regulating member). And a rubber layer 5 that partially covers the bracket member 2.

  The bracket member 2 is a casting made of an aluminum alloy material. As shown in FIG. 3, the stopper portion 9 covered with the rubber layer 5 is wider than the stopper portion 9 in the width direction W side (left side in FIG. 3). ) Extends toward the mounting portion 7 while gradually increasing the width from the mounting portion 7 that protrudes larger than the other side (the right side in FIG. 3), and connects the stopper portion 9 and the mounting portion 7 gently. And an intermediate portion 8.

  In the state in which the vibration isolator 1 is assembled (see FIG. 1), the bracket member 2 is surrounded by the mounting portion 7 and the intermediate portion 8 protruding from the upper metal fitting 4 and the stopper portion 9 being inserted into the upper metal fitting 4. When a large vibration is input from the engine, the stopper portion 9 functions as a stopper. The stopper portion 9 is provided with an insertion hole 13b through which a bolt 6 as a shaft member for coupling to the mount device 3 is inserted. On the other hand, a screw member 12 for hanging the engine is attached to the attachment portion 7 in the vicinity of the tip of the protruding side D.

  Since the bracket member 2 is attached to the engine side in a state of being connected to the mount device 3, the width direction W one side of the attachment portion 7 is formed to protrude so as to conform to the positional relationship of these attachment locations. However, if the bracket member 2 is formed in an inverted L shape, for example, by simply protruding and projecting on one side in the width direction W of the mounting portion 7, local stress concentration occurs and it becomes difficult to ensure the strength. It tends to be difficult to perform displacement regulation stably. Therefore, the stopper portion 9 and the attachment portion 7 are smoothly connected by the intermediate portion 8 to prevent local stress concentration and to secure the strength of the bracket member 2.

  A pair of first mounting holes 10 and a second mounting hole 11 provided in the vicinity of the tip of the projecting side D are formed in the mounting portion 7 along the width direction W of the bracket member 2. . A shaft portion of a screw member (not shown) is inserted into the first mounting hole 10. On the other hand, one end of a screw member 12 composed of a long screw is screwed into the second mounting hole 11. The bracket member 2 is attached to the engine side via the screw member inserted through the first attachment hole 10 and the screw member 12 screwed into the second attachment hole 11.

  The intermediate portion 8 has an inclined surface 8 a that is inclined upward from the stopper portion 9 toward the mounting portion 7. Here, “inclined ascending” means inclining toward the outside of the bracket member 2 as the distance from the stopper portion 9 increases, as shown in FIG. In the present embodiment, the inclined surface 8a is formed so that the width dimension (width direction W length) and thickness dimension (vertical direction length in FIG. 4) of the intermediate portion 8 gradually increase from the stopper portion 9 toward the mounting portion 7. Is provided.

  The stopper portion 9 includes a connecting portion 13 that is connected to the mounting device 3. The connecting portion 13 has a countersink portion 13 a that houses the head of the bolt 6 and an insertion hole through which the shaft portion of the bolt 6 is inserted. 13b. As shown in FIG. 5, a pair of positioning holes 13 c provided on both sides in the width direction of the insertion hole 13 b and a connection surface 13 d that contacts the upper surface of the mount device 3 are formed on the bottom surface of the stopper portion 9. . The stopper portion 9 is covered with the rubber layer 5 in the region excluding the connecting portion 13 on the upper surface, the region excluding the connecting surface 13d on the lower surface and the side surface, and the inner periphery of the upper metal fitting 4 is increased in order to increase the durability of the bracket member 2. It is comprised so that the impact at the time of contact | abutting to the surface 4f (refer FIG. 6) may be suppressed.

  The mount device 3 is configured by assembling a mount member 3c in a cylindrical outer frame metal fitting 3a made of a steel material. Further, a leg-shaped fixing metal fitting 3b having a through hole is joined to the outer peripheral surface of the outer frame metal fitting 3a, and the mounting device 3 is attached to the vehicle body frame by a screw member inserted through the through hole. This is performed by fastening the fixture 3b and the vehicle body frame using (not shown).

  The mount member 3c includes a cylindrical fitting 3d connected to the bracket member 2 and a rubber-like elastic body 3e vulcanized and formed in the cylindrical fitting 3d, and further, an antifreezing liquid such as ethylene glycol is enclosed therein. Built-in liquid enclosure (not shown). The mount device 3 has a function of reducing vibrations input from the engine via the bracket member 2 by utilizing the elastic deformation action of the rubber-like elastic body 3e and the flow action of the sealed fluid. In the present invention, the configuration of the mounting device is not particularly limited, and a conventionally known mounting device can be appropriately employed.

  On the upper surface of the mounting device 3, a female screw portion 3 f to which the bolt 6 is screwed and a pair of positioning protrusions 3 g used for positioning the bracket member 2 are provided. The bracket member 2 is coupled to the mount device 3 by screwing the bolt 6 inserted into the insertion hole 13b into the female screw portion 3f while positioning the positioning projection 3g in the positioning hole 13c.

  The upper metal fitting 4 is made of a steel material, and the outer frame metal fitting 3a is integrally joined to the lower part thereof. The upper metal fitting 4 has an opening 4 a that opens to the side thereof, and an edge 4 b that protrudes like a bowl on the outer periphery of the opening 4 a, and is configured to surround the stopper portion 9. Thus, when a large vibration is input from the engine, the stopper portion 9 abuts on the inner peripheral surface of the upper metal fitting 4 to function as a stopper, and the relative displacement amount of the bracket member 2 with respect to the mounting device 3 is restricted. The durability of the mount device 3 is ensured.

  As shown in FIG. 3, the edge portion 4b on the side D on which the mounting portion 7 projects is formed so as to be displaced from the stopper portion 9 side (upper side in FIG. 3) when the vibration isolator 1 is assembled. Yes. As a result, the intermediate portion 8 whose width gradually increases can be smoothly protruded from the edge portion 4b while the stopper portion 9 is surrounded by the upper metal fitting 4, and the displacement restriction of the bracket member 2 on which the mounting portion 7 projects is stabilized. Can be done automatically.

  On the upper surface of the upper metal fitting 4, an opening 4 c that opens in an area through which the head of the bolt 6 can pass and an accommodation hole 4 d that accommodates the protrusion 15 a provided on the rubber layer 5 are formed. The protrusion 15a and the accommodation hole 4d will be described later. A plurality of brackets 4e each having a through-hole are joined to the outer peripheral surface of the upper metal fitting 4, and the upper metal fitting 4 is attached to the body frame by a screw member (not shown) inserted through the through-hole. ) Is used to fasten each bracket 4e and the vehicle body frame.

  The outer frame metal 3 a is provided with a facing surface 20 that projects in a flange shape from the upper end portion toward the outer peripheral side and faces the intermediate portion 8 of the bracket member 2 from below. Thereby, displacement regulation of bracket member 2 can be performed more suitably and stably. As shown in FIG. 5, the bracket member 2 is covered with the above-described portion of the stopper portion 9 as well as the outer peripheral surface facing the facing surface 20 of the intermediate portion 8, that is, the lower surface of the intermediate portion 8. It faces the intermediate portion 8 with the rubber layer 5 interposed therebetween. Thereby, the damage to the bracket member 2 accompanying displacement control can be reduced favorably.

  In this embodiment, the opposing surface 20 protrudes from the opening 4a of the upper metal fitting 4 toward the attachment portion 7 side (lower side in FIG. 3) of the bracket member 2, while the protruding length of the side D on which the attachment portion 7 projects. The length L1 is formed larger than the protruding length L2 on the other side. For this reason, the area of the area (hatching area shown in FIG. 7A) where the facing surface 20 and the rubber layer 5 face each other is relatively large, and a contact area at the time of displacement regulation is secured, so that the bracket member 2 described above. The damage reduction effect can be enhanced. On the other hand, when the protruding length of the facing surface 20 is constant, the area of the region where the facing surface 20 and the rubber layer 5 face each other (the hatched region shown in FIG. 7B) becomes relatively small. The above-described damage reduction effect tends to be small.

  In the vibration isolator 1, the stopper portion 9 is inserted into the upper metal fitting 4, the mount member 3c is assembled into the outer frame metal fitting 3a, and the bolt 6 inserted into the insertion hole 13b of the bracket member 2 is screwed to the female screw portion 3f. Then, the bracket member 2 and the mounting device 3 are assembled by fastening. Therefore, the bracket member 2 is not directly connected to the upper metal fitting 4 but is connected and supported on the mount device 3 in a cantilever state. Note that a double-sided bolt may be used instead of the headed bolt 6. In such a case, one end of the bolt is screwed into the female screw portion 3f in advance, and only the nut is screwed to the other end. Fastening can be done.

  As shown in FIGS. 3 and 4, a projection group 15 is provided on the outer peripheral surface of the rubber layer 5 on both sides in the width direction W of the connecting portion 13 provided in the stopper portion 9. The protrusions 15a and 15b constituting the protrusion group 15 are formed by partially protruding the rubber layer 5, and are each provided in a hemispherical shape with the same height. Of the protrusions constituting the protrusion group 15, the protrusion 15a is accommodated in the accommodation hole 4d formed in the upper metal fitting 4 as shown in FIG. As a result, even when an external force is repeatedly input to the attachment portion 7 in a state before attachment to the engine or the body frame, for example, during accumulation work or transportation work, the protrusion 15a is locked in the accommodation hole 4d. Further, it is possible to suitably prevent a part of the stopper portion 9 from coming out of the upper metal fitting 4 due to the movement of the bracket member 2 around the bolt 6.

  In the present embodiment, the size of the protrusion 15a is larger than that of the other protrusion 15b, and the protrusion 15a is press-fitted into the accommodation hole 4d, so that the above locking action is suitably ensured. In addition, the protrusion 15b that is not accommodated in the accommodation hole 4d is opposed to the inner peripheral surface 4f of the upper metal fitting 4 while being pressed against the inner peripheral surface 4f. Therefore, in the state where the vibration isolator 1 is attached to the engine or the vehicle body frame, The hitting sound generated by the collision between the inner peripheral surface 4f of the upper metal fitting 4 and the rubber layer 5 can be reduced.

  A plurality of ridges 16 extending in the thickness direction of the bracket member 2 while being bulged outward in the width direction W are provided side by side on the side surface of the rubber layer 5. Thereby, in a state in which the vibration isolator 1 is attached to the engine or the vehicle body frame, it is possible to reduce the hitting sound generated by the collision between the side surface of the rubber layer 5 and the inner peripheral surface of the upper metal fitting 4 facing it. . In addition, by providing the protrusion 16 instead of the protrusion on the side surface of the rubber layer 5, the rubber layer 5 having the protrusion group 15 on the upper surface can be smoothly removed from the molding die.

  In the present invention, the number and position of the projections 15a and 15b and the accommodation hole 4d are not particularly limited, but the projections 15a accommodated in the accommodation holes 4d are provided on both sides in the width direction W of the connecting portion 13 as in this embodiment. It is preferable that Thereby, when the external force of the width direction W is input into the attachment part 7, the movement along the circumference | surroundings of the volt | bolt 6 of the bracket member 2 is suppressed with sufficient balance, and a part of stopper part 9 slips out from the upper metal fitting 4. Can be prevented.

  In the present embodiment, projections 15b that are not accommodated in the accommodation holes 4d are provided on both sides of the projection 15a in the length direction of the bracket member 2 (vertical direction in FIG. 3). The bracket member 2 connected in a cantilever state is subjected to a force that causes the mounting portion 7 to be lowered and the stopper portion 9 to be raised. It is possible to effectively prevent the bracket member 2 from being inclined.

  The rubber layer 5 can be covered with the stopper portion 9 by injecting and filling a rubber material into the cavity and vulcanization molding with the bracket member 2 positioned and set in the molding die. A rubber layer 5 vulcanized and molded separately from the bracket member 2 is mounted on the stopper portion 9.

  5 are provided on both sides in the width direction W of the inner peripheral surface of the rubber layer 5, and the convex portions 17 are fitted on the outer peripheral surface of the stopper portion 9 below the side surface. A concavity 18 is formed. Thereby, it is possible to suitably suppress the rubber layer 5 vulcanized and molded separately from the bracket member 2 from coming off from the stopper portion 9 and being peeled off.

  In the embodiment described above, the example in which the vibration isolator includes the bracket member 2 made of an aluminum alloy has been described. However, instead of this, for example, iron or another metal material may be used. However, the bracket member made of aluminum alloy is lighter than the same-shaped bracket member made of iron, has a high resonance point (vibration eigenvalue), and can shift the peak of the vibration level to the high frequency side. Therefore, it is possible to suppress the resonance of the bracket member itself from adversely affecting the vibration isolation performance while reducing the weight of the device.

The perspective view which shows an example of the vibration isolator which concerns on this invention Exploded view of vibration isolator Top view of bracket member and upper bracket Side view of bracket member Bottom view of bracket member Partial sectional view showing side surfaces of bracket member and upper metal fitting The figure which shows the area | region where an opposing surface and a rubber layer oppose

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anti-vibration device 2 Bracket member 3 Mounting device 4 Upper metal fitting (displacement control member)
4a Opening 4b Edge 4d Housing hole 4f Inner peripheral surface 5 of upper metal fitting Rubber layer 7 Mounting portion 8 Intermediate portion 9 Stopper portion 13 Connection portion 15 Protrusion group 15a Protrusion 15b Protrusion 16 Protrusion 17 Convex portion 18 Concavity 20 Opposing surface D Side L1 on which the mounting part protrudes The protruding length of the side on which the mounting part on the opposite surface protrudes

Claims (5)

A bracket member attached to one of the vibration generator and a support that supports the vibration generator, and a mount connected to the bracket member and attached to the other of the vibration generator and the support An anti-vibration device comprising: a device; a displacement restricting member that encloses and surrounds a part of the bracket member; and a rubber layer that covers an outer peripheral surface of the bracket member surrounded by the displacement restricting member.
The bracket member is
A stopper part inserted into an opening part opened to the side of the displacement regulating member and coupled to the mount device;
A mounting portion that is wider than the stopper portion and one side in the width direction protrudes larger than the other side, and is attached to one of the vibration generator and the support,
An intermediate portion that protrudes from the opening and extends toward the mounting portion while gradually increasing the width from the stopper portion, and connects the stopper portion and the mounting portion;
An anti-vibration device according to claim 1, wherein an edge portion of the opening portion on which the mounting portion protrudes is displaced toward the stopper portion.   The rubber layer is opposed to at least the outer peripheral surface of the stopper portion and the facing surface of the intermediate portion, and has a facing surface that protrudes from the opening portion toward the attachment portion and faces the intermediate portion from below. The anti-vibration device according to claim 1, wherein the anti-vibration device covers an outer peripheral surface to be projected, and has a protruding length on a side where the mounting portion of the facing surface is formed to protrude from the other side.   The stopper portion includes a connecting portion connected to the mounting device, and a protrusion group is provided on an outer peripheral surface of the rubber layer on both sides in the width direction of the connecting portion, and a part of the protrusion group is formed on the displacement regulating member. The vibration isolator of Claim 1 or 2 comprised so that it might be accommodated in the formed accommodation hole.   The anti-vibration device according to any one of claims 1 to 3, wherein a protrusion is juxtaposed on a surface of the rubber layer covering a side surface of the stopper portion surrounded by the displacement regulating member. The rubber layer is vulcanized separately from the bracket member, and is attached to cover the outer peripheral surface of the stopper portion,
The vibration isolator according to any one of claims 1 to 4, wherein a convex portion is provided on the inner peripheral surface of the rubber layer, and a concave portion in which the convex portion is fitted is formed on the outer peripheral surface of the stopper portion. .

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