JP4680150B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator that prevents transmission of vibration from a member that generates vibration, and more particularly, to a vibration isolator that can be applied to an engine mount or the like of an automobile.

  For example, an anti-vibration device as an engine mount is arranged between an engine that is a vibration generation unit of a vehicle and a vehicle body that is a vibration receiving unit, and the anti-vibration device absorbs vibration generated by the engine, It has a structure that prevents transmission to the vehicle body.

  As an example, in Patent Document 1 below, a rubber elastic body is attached to the inner cylinder fitting attached to the engine side and the outer cylinder fitting attached to the vehicle body side by vulcanization adhesion, and vibration is generated by the elastic force of this rubber elastic body. An anti-vibration device is described that supports the engine with the vehicle body while absorbing water.

By the way, in this vibration isolator, a semi-finished product in which an outer cylinder fitting, an inner cylinder fitting and a rubber elastic body are integrally molded is used. This semi-finished product was treated in advance by applying a base treatment such as a blasting treatment or a chemical conversion treatment to the two fittings of the outer cylinder fitting and the inner cylinder fitting, and further applying an adhesive on it. Generally, the outer cylinder fitting and the inner cylinder fitting are set in a vulcanization mold, and a rubber material is injected into the vulcanization mold and injected.
JP 2005-23973 A

The vibration isolator described in Patent Document 1 has the following problems.
In order to obtain the above-mentioned semi-finished product, it is necessary to perform base treatment such as blast treatment or chemical conversion treatment on the metal fitting to be vulcanized, and further to apply an adhesive on it. Is very cumbersome and expensive. In the vibration isolator described in Patent Document 1 described above, there are at least two outer tube fittings and two inner tube fittings that require such a troublesome process, which increases the manufacturing time. Or, there was a problem that the manufacturing cost was increased.

  The present invention has been made in view of the above circumstances, and its object is to reduce the number of treatments required for these metal fittings by reducing the number of metal fittings for vulcanizing and bonding rubber elastic bodies. An object of the present invention is to provide a vibration isolator capable of reducing time and reducing manufacturing costs without difficulty.

An anti-vibration device according to claim 1 is provided with an inner metal fitting connected to one of the vibration generating portion and the vibration receiving portion , and a main body rubber portion whose upper portion is vulcanized and bonded to the inner metal fitting and extends downward from the inner metal fitting. And a storage metal fitting for housing the inner metal fitting and the rubber elastic body so that a part of the inner metal fitting is exposed to the outside while being connected to the other of the vibration generating portion and the vibration receiving portion. with the door, the housing fitting, said a lower plate fitting for supporting the elastic body from below, is fixed to the lower plate fitting so as to be positioned on the upper side of the lower plate fitting, the inner fitting the housing bracket when relatively moved upward a predetermined amount or more with respect to chromatic and upper plate fitting to restrict further movement of the inner bracket in contact with the inner bracket, said lower plate fitting, the elastic body The lower side A bottom plate portion to be supported, and a rising portion having an inner cylindrical portion that rises from the outer periphery of the bottom plate portion to a predetermined height and whose inner diameter is equal to or slightly larger than the outer diameter of the main rubber portion. The upper portion protrudes radially outward from the inner cylindrical portion and is disposed to face the lower surface of the inner metal fitting, and when the inner metal fitting moves relative to the storage fitting downward by a predetermined amount or more, A bound stopper surface that abuts against the inner metal fitting and restricts further movement of the inner metal fitting is formed, the upper plate metal fitting is disposed to face the outer peripheral surface of the inner metal fitting, and the inner metal fitting serves as the storage metal fitting. A cylindrical portion that abuts against the inner metal fitting and restricts further movement of the inner metal fitting when the front and rear and the left and right directions move relative to each other by a predetermined amount or more, and is attached to the upper part of the cylindrical portion, Inner bracket Wherein when the relative movement upward more than a predetermined amount relative to the housing bracket, characterized in that it comprises an upper plate portion which restrict further movement of the inner bracket in contact with said inner fitting.

  According to the vibration isolator according to claim 1, the inner metal fitting and the rubber elastic body whose upper part is vulcanized and bonded to the inner metal fitting are housed in the storage metal fitting, and the rubber elastic body is vulcanized and bonded as the metal fitting. Only one inner bracket is needed. For this reason, compared with the conventional vibration isolator having two outer metal fittings and two inner metal fittings for vulcanizing and bonding rubber elastic bodies, the number of metal fittings that require a base treatment work is reduced, and the work time is correspondingly reduced. As a result, the cost can be reduced.

In addition, according to the vibration isolator according to claim 1 , the bound stopper surface is formed on the lower plate metal fitting itself, and the configuration is simpler than the case where the bound stopper surface is separately provided outside the housing metal fitting. And the number of parts can be reduced.

Furthermore, according to the vibration isolator which concerns on Claim 1, the lower plate metal fitting is provided with the standing part, The bound of the inner metal fitting is controlled by this standing part. The upper plate fitting includes a cylindrical portion and an upper plate portion. The cylindrical portion restricts the front / rear and left / right movement of the inner fitting, and the upper plate portion restricts the rebound of the inner fitting.
The vibration isolator according to claim 2 is characterized in that the upper plate metal fitting is fixed to the lower plate metal fitting by press-fitting an upright portion of the lower plate into a cylindrical portion of the upper plate metal fitting. To do.
According to the vibration isolator according to claim 2 , the upper plate is fixed to the lower plate metal fitting by press-fitting the lower plate side upright portion into the cylindrical portion of the upper plate side, compared with a fixing means such as welding. The upper plate can be firmly fixed to the lower plate metal fitting without adversely affecting the internal rubber elastic body.

The vibration isolator according to claim 3 is characterized in that the rubber elastic body is stored in the storage metal fitting in a state of being precompressed in the vertical direction.
According to the vibration isolator according to claim 3 , since the rubber elastic body is pre-compressed and stored in the storage bracket, when supporting a relatively heavy member such as an engine with the inner bracket, The amount of subsidence of the rubber elastic body can be reduced, and accordingly, a highly rigid support can be realized.

The vibration isolator according to claim 4 is characterized in that the inner metal fitting passes through an opening formed in the upper plate portion of the upper plate and is exposed to the outside.
According to the vibration isolator which concerns on Claim 4 , a part of inner metal fitting protrudes upwards and is exposed, It becomes advantageous when connecting an inner metal fitting to the bracket arrange | positioned above the vibration isolator.

The vibration isolator according to claim 5 is characterized in that the inner metal fitting is exposed to the outside through an opening formed in a side portion of the upper plate metal fitting.
According to the vibration isolator which concerns on Claim 5 , a part of inner metal fitting will protrude and be exposed to the side, and it becomes advantageous when connecting an inner metal fitting to the bracket arrange | positioned at the side of a vibration isolator. .

  According to the present invention, there is only one inner metal fitting for vulcanizing and bonding a rubber elastic body. For this reason, compared with the conventional vibration isolator having two outer metal fittings and two inner metal fittings for vulcanizing and bonding rubber elastic bodies, the number of metal fittings that require a base treatment work is reduced, and the work time is correspondingly reduced. As a result, the cost can be reduced.

An embodiment of a vibration isolator according to the present invention will be described with reference to the drawings.
<First Embodiment>
1 and 2 show a first embodiment of a vibration isolator according to the present invention, FIG. 1 is a perspective view, and FIG. 2 is a sectional view. In these drawings, reference numeral 1 denotes an inner metal fitting connected to a vibration generating part such as an engine via a bracket or the like. A rubber elastic body 2 is vulcanized and bonded to the inner metal fitting 1. Moreover, the inner metal fitting 1 and the rubber elastic body 2 are stored in the storage metal fitting 3 so that a part of the inner metal fitting 1 is exposed to the outside. The storage fitting 3 is connected to a vibration receiving portion such as a vehicle body via a bracket.

  The inner metal fitting 1 is composed of a bottom plate portion 5 formed in a disc shape and a connecting portion 6 erected at the center of the bottom plate portion 5. A ring-shaped protrusion 5 a is formed on the outer peripheral portion of the bottom surface of the bottom plate portion 5. The rubber elastic body 2 is vulcanized and bonded to the bottom plate portion 5, but the rubber elastic body 2 is not vulcanized and bonded to the connecting portion 6. A screw hole 7 is formed in the connecting portion 6 so as to reach a predetermined depth from the upper surface, and an unshown engineered bolt is screwed into the screw hole 7 so that an engine side bracket (not shown) is connected to the inner metal fitting 1. Is done.

The rubber elastic body 2 includes a columnar body rubber portion 9 extending downward from the inner metal fitting 1 and a disk-shaped buffer rubber portion 10 disposed concentrically with the body rubber portion 9 on the upper side of the body rubber portion 9. It is configured. The outer diameter L1 of the main rubber part 9 is set smaller than the outer diameter L2 of the bottom plate part 5 of the inner metal fitting. The buffer rubber portion 10 is disposed outside the bottom plate portion 5 so as to surround the bottom plate portion 5 of the inner metal fitting 1, and the outer diameter L3 thereof is set larger than the outer diameter L2 of the bottom plate portion 5. The shock-absorbing rubber portion 10 is located below the bottom plate portion 5 and has a lower surface portion projecting from the main body rubber portion 9 to the outer periphery to the bound stopper rubber portion 10A, and an outer peripheral side surface located outward from the bottom plate portion 5 to the side covered portion. In the stopper rubber portion 10B, the ring-shaped upper surface located above the bottom plate portion 5 is a rebound stopper rubber portion 10C.
A ring-shaped groove 14 is formed between the main rubber part 9 and the buffer rubber part 10.

  The storage metal fitting 3 is composed of a lower plate metal fitting 12 that supports the rubber elastic body 2 from below, and an upper plate metal fitting 13 that is fixed to the lower plate metal fitting 12 so as to be positioned above the lower plate metal fitting 12. .

  The lower plate fitting 12 has a bottom plate portion 15 that supports the main rubber portion 9 of the rubber elastic body 2 from the lower side, and a double cylindrical upright that rises once from the outer periphery of the bottom plate portion 15, is folded back at a predetermined height, and hangs downward. Part 16.

  An inner diameter M1 of the inner cylindrical portion 16A of the standing portion 16 is set to be equal to or slightly larger than the outer diameter L1 of the main rubber portion 9. In FIG. 2, it is set to be large. A flat surface portion is formed at the top of the semi-standing portion 16. The flat portion faces the bound stopper rubber portion 10A, and when the inner metal fitting 1 is lowered, it comes into contact with the bound stopper rubber portion 10A so that the inner fitting lowers a predetermined amount or more with respect to the housing fitting. Bound stopper surface 16A for restricting the relative movement of. In addition, the outer diameter M <b> 2 of the standing part 16 is set to be larger than the outer diameter L <b> 3 of the buffer rubber part 10.

The upper plate fitting 13 has a cylindrical portion 18 and an upper and lower plate portion 19 attached to the upper portion of the cylindrical portion 18, and has a low and low cylindrical shape that is upside down. An upright portion 16 of the lower plate metal fitting 12 is press-fitted into the lower portion of the cylindrical portion 18, whereby the upper plate metal fitting 13 is fixed to the lower plate metal fitting 12.
The upper inner surface of the cylindrical portion 18 faces the side stopper rubber portion 10B of the buffer rubber portion 10, and abuts against the bound stopper rubber portion 10B when the inner metal fitting 1 moves in the front-rear and left-right directions. Thus, the side stopper surface 18 </ b> A restricts the relative movement of the inner metal fitting 1 in the front-rear and left-right directions by a predetermined amount or more with respect to the housing metal 3. The cylindrical portion 18 has an inner diameter set so that a slight gap is formed over the entire circumference with respect to the side stopper comb portion 10B. This gap is not always necessary, and may be eliminated depending on the material of the rubber elastic body 2.

  The lower surface of the upper plate portion 19 faces the rebound stopper rubber portion 10C of the buffer rubber portion 10, and when the inner metal fitting 1 moves upward, it comes into contact with the rebound stopper rubber portion 10C to It is a rebound stopper surface 19 </ b> A that restricts the relative movement of the bracket 1 relative to the storage bracket 3 upward by a predetermined amount or more.

  An opening 20 is formed in the center of the upper plate portion 19, and an upper portion of the connecting portion of the inner metal fitting 1 passes through the opening 20 so as to protrude outward.

Next, the operation of the vibration isolator 1 according to the first embodiment of the present invention will be described.
The storage metal fitting 3 is connected to the vehicle body side, and the inner metal fitting 1 is connected to the engine side. Here, a load accompanying the weight of the engine is applied to the inner metal fitting 1. At this time, the main rubber part 9 of the rubber elastic body 2 is compressed, and as shown in FIG. 3, the inner metal fitting 1 and the buffer rubber part 10 vulcanized and bonded to the outer side sink. At this time, gaps N1 and N2 are formed between the bound stopper rubber portion 10A and the bound stopper surface 16A, and between the bound stopper rubber portion 10C and the rebound stopper surface 19A, respectively.

  Note that when the inner metal fitting 1 and the rubber elastic body 2 are stored in the storage metal fitting 3, the rubber elastic body 2 is pre-compressed in the vertical direction in advance. By increasing the amount of this pre-compression, the weight of the engine is increased. Even if the load accompanying this is applied to the rubber elastic body 3, it is possible to prevent a gap from being generated between the rebound stopper rubber portion 10C and the rebound stopper surface 19A. By configuring in this way, it is possible to prevent the hitting sound when the rebound stopper rubber portion 10C and the rebound stopper surface 19A come into contact with each other.

  In this state, when the engine is started and vibration is generated from the engine, this vibration is transmitted to the inner metal fitting 1 through a bracket (not shown) and further transmitted to the rubber elastic body 2. The rubber elastic body 2 is appropriately deformed to absorb this vibration. In other words, when the vibration from the engine side is transmitted, the rubber elastic body 2 acts as a main vibration absorber, absorbs and attenuates the vibration by the vibration damping function based on the internal friction of the rubber elastic body 2, and the vibration is generated on the vehicle body side. It becomes difficult to be transmitted.

  Then, when excessively large vibration is input to the vibration isolator, and the rubber elastic body 2 is deformed so that the inner metal fitting 1 moves upward in FIG. 3, for example, the rebound stopper rubber portion 10C is rebound stopper. The surface 19A abuts strongly and deforms. Thereby, the further movement of the inner metal fitting 1 is controlled.

  On the other hand, when an excessively large vibration is input and the rubber elastic body 2 is deformed so that the inner metal fitting 1 moves downward in FIG. 3, for example, the bound stopper rubber portion 10A is strongly against the bound stopper surface 16A. Contact and deform. Thereby, the further movement of the inner metal fitting 1 is restricted, and as a result, the deformation of the main rubber part 9 of the rubber elastic body 2 is suppressed.

  Further, during sudden acceleration, sudden braking, or sudden cornering, the rubber elastic body 2 is deformed so that the inner metal fitting 1 moves in the left-right direction or the front-rear direction (the front and back of the paper) in FIG. In this case, the side stopper rubber portion 10B strongly contacts the side stopper surface 18A and deforms. Thereby, the further movement of the inner metal fitting 1 is controlled.

  According to the vibration isolator having the above-described configuration, the inner metal fitting 1 and the rubber elastic body 2 whose upper part is vulcanized and bonded to the inner metal fitting 1 are housed in the housing fitting 3, and the rubber elastic body 2 is vulcanized and bonded. There is only one inner metal fitting 1 to be used. For this reason, compared with the conventional vibration isolator having two outer cylinder fittings and two inner cylinder fittings for vulcanizing and bonding rubber elastic bodies, the surface treatment work on the vulcanized bonding fittings is reduced. Work time can be shortened and costs can be reduced.

Further, the lower plate metal 12 itself is formed with a bound stopper surface 16A, and the configuration is simplified and the number of parts is reduced as compared with the case where a separate bound stopper surface is provided outside the housing metal 3. Can do.
Further, the upper plate metal fitting 13 is formed in a bottomed cylindrical shape having a side stopper surface 18A and a rebound stopper surface 19A, and, thereby, a shock absorbing rubber portion 9 having a stopper rubber portion 10B facing these stopper surfaces. Can be formed integrally with the main body rubber portion 9, and the manufacture thereof is facilitated accordingly.

<Second Embodiment>
4 and 5 show a second embodiment of the vibration isolator according to the present invention, FIG. 1 is a perspective view, and FIG. 2 is a sectional view. In this embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  The difference between the vibration isolator of the second embodiment and the first embodiment is that, in the first embodiment, an opening 20 is formed in the upper plate portion 19 of the upper plate fitting 13, and this opening 20, the connecting portion 6 of the inner metal fitting 1 is penetrated so as to protrude outward, whereas in the second embodiment, an opening 31A is provided in the cylindrical portion 31 of the up-plate metal fitting 30. The inner metal fitting 32 is penetrated so as to protrude outward using the opening 31A.

Thereby, a part of the inner metal fitting 32 protrudes to the side and is exposed, which is advantageous when connecting a part of the inner metal fitting 32 to a bracket disposed on the side of the vibration isolator.
Here, the shape of the connecting portion 33 of the inner metal fitting 1 is also changed from that of the first embodiment. That is, here, the tip of the connecting portion 33 is wide, and two screw holes 33a for connection are provided there.

The present invention is not limited to the above-described embodiment, and can be appropriately changed in design without departing from the spirit of the invention.
For example, in the above-described embodiment, press fitting is used to fix the lower plate metal fitting and the upper plate metal fitting. However, the present invention is not limited to this, and other means such as screws and rivets may be used for fixing. Also good.

It is a perspective view of 1st Embodiment of the vibration isolator which concerns on this invention. It is sectional drawing of 1st Embodiment of the vibration isolator which concerns on this invention. It is sectional drawing which shows the use condition of 1st Embodiment of the vibration isolator which concerns on this invention. It is a perspective view of 2nd Embodiment of the vibration isolator which concerns on this invention. It is sectional drawing of 2nd Embodiment of the vibration isolator which concerns on this invention.

Explanation of symbols

1 inner bracket,
2 rubber elastic body,
3 Storage bracket,
9 Body rubber part,
10 Buffer rubber part,
10A Bound stopper rubber part,
10B Side stopper rubber part,
10C Rebound stopper rubber part,
12 Lower plate bracket,
13 Upper plate bracket,
15 Bottom plate part,
16 Standing part,
16A Bound stopper surface 18 Cylindrical part,
18A Side stopper surface 19 Upper plate part,
19A Rebound stopper surface 20 Opening,
30 Upplate bracket,
31 cylindrical part,
31A opening,
32 Inner metal fittings.

Claims (5)

An inner metal fitting connected to one of the vibration generator and the vibration receiver;
A rubber elastic body having a main body rubber portion whose upper portion is vulcanized and bonded to the inner metal fitting and extends downward from the inner metal fitting ;
The inner metal fitting and the metal fitting for accommodating the rubber elastic body are provided so that a part of the inner metal fitting is exposed to the outside while being connected to the other of the vibration generating portion and the vibration receiving portion,
The storage bracket is fixed to the lower plate bracket so as to be positioned on the upper side of the lower plate bracket and the lower plate bracket that supports the main body rubber portion from the lower side. when relative movement upward or quantitative, have a an upper plate fitting to restrict further movement of the inner bracket in contact with the inner fitting,
The lower plate bracket has a bottom plate portion that supports the main rubber portion from below, and an inner cylinder that rises from the outer periphery of the bottom plate portion to a predetermined height and has an inner diameter that is equal to or slightly larger than the outer diameter of the main rubber portion. And an upper portion of the upright portion that protrudes radially outward from the inner cylindrical portion and is opposed to the lower surface of the inner metal fitting, and the inner metal fitting is attached to the storage metal fitting. On the other hand, when relatively moving downward by a predetermined amount or more, a bound stopper surface is formed that contacts the inner metal fitting and restricts further movement of the inner metal fitting,
The upper plate metal fitting is disposed opposite the outer peripheral surface of the inner metal fitting, and abuts against the inner metal fitting when the inner metal fitting moves relative to the storage metal in the front-rear and left-right directions by a predetermined amount or more. A cylindrical portion that restricts further movement of the inner metal fitting, and an inner metal fitting that is attached to the upper portion of the cylindrical portion and moves relative to the storage metal fitting by a predetermined amount or more. An anti-vibration device comprising: an upper plate portion that abuts and restricts further movement of the inner metal fitting . 2. The vibration isolator according to claim 1 , wherein the upper plate metal fitting is fixed to the lower plate metal fitting by press-fitting an upright portion of the lower plate into a cylindrical portion of the upper plate metal fitting . The vibration isolator according to claim 1 or 2 , wherein the rubber elastic body is stored in the storage metal fitting in a state in which the rubber elastic body is pre-compressed in the vertical direction. The vibration isolator according to any one of claims 1 to 3, wherein the inner metal fitting protrudes outward through an opening formed in an upper plate portion of the upper plate. The vibration isolator according to any one of claims 1 to 3, wherein the inner metal fitting protrudes outwardly through an opening formed in a cylindrical portion of the upper plate metal fitting.

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