JPH10205562A - Vibration proofing mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration proofing mount with a spring constant starting lower in the longitudinal and cross direction to show excellent vibration proofing performance, accordingly. SOLUTION: A vibration proofing mount has an underbracket 1 provided with a center bolt through-hole 1e, an upperbracket 2 provided with a bolt insertion hole 2c, an elastic body 3 to connect both brackets 1, 2, a center bolt 4 formed with a bolt part 4a inserted into the bolt insertion hole 2c, connected to the upperbracket 2, inserted through the center bolt through-hole 1e and provided with a flange 4c at the lower end, which has the diameter larger than the inner diameter of the center bolt through-hole 1e, and a stopper 6 provided at the opening peripheral edge of the center bolt through-hole 1e to limit a relating displacement between the unerbracket 1 and the enter bolt 4 to a given distance in the longitudinal and cross direction. A clearance 7 is provided between the center bolt 4 and the stopper 6 in the longitudinal and cross direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration mount according to an anti-vibration technique, and more particularly to an anti-vibration mount suitable for use as a cabin mount of a cruiser.

[0002]

2. Description of the Related Art In a conventional anti-vibration mount shown in FIGS. 6 and 7, an adapter 52 screwed around the lower end of a center bolt 51 is always provided with a stopper made of a rubber-like elastic material over the entire circumference. Since it is in contact with 53, the spring constant in the front, rear, left and right directions is already high from its rise. Therefore, there is a disadvantage that the anti-vibration performance is not so good.

[0003] In addition, the above prior art has the following disadvantages.

In order to receive an input load (including an initial load) in a vertical direction mainly by shearing only an elastic body 56 made of a rubber-like elastic material that connects an under bracket 54 and an upper bracket 55, the elastic body 56 Set (including initial set) is likely to occur. Since the setting of the spring constants in the up-down direction, the front-rear direction, and the left-right direction is mainly performed using only the elastic body 56, the operation requires much labor and time. To connect the center bolt 51 to the upper bracket 55, an adapter 52, a washer 57 and a nut 5 are used.
8 and a plurality of nuts 60, 61 for attaching the center bolt 51 to the supported member 59 separately.
Due to the structure, the supported member 59 cannot be directly abutted against the upper surface of the upper bracket 55 and fixed (the mounting seat surface cannot be secured).

[0005]

SUMMARY OF THE INVENTION In view of the above, the present invention provides an anti-vibration mount that has a low rise in spring constant in the front-rear and left-right directions, and can exhibit excellent anti-vibration performance accordingly. The purpose is to do.

Further, it is possible to improve the durability of the elastic body by making it less likely to set the elastic body, to easily tune the spring constant in the up-down direction and in the front-rear and left-right directions, and to attach the mounting seat to the upper bracket. It is an object of the present invention to provide an anti-vibration mount capable of securing a surface.

It is still another object of the present invention to provide an anti-vibration mount having a new dynamic damper function and capable of exhibiting an anti-vibration effect by the dynamic damper function.

[0008]

To achieve the above object, an anti-vibration mount according to claim 1 of the present invention is mounted on one of a support member and a supported member and provided with an under bolt provided with a center bolt insertion hole. A bracket, an upper bracket attached to the other of the support member and the supported member, and provided with a bolt part insertion hole for a sender bolt, an elastic body made of a rubber-like elastic material connecting the two brackets, and the bolt part A center bolt having a bolt portion inserted into the insertion hole, being connected to the upper bracket, being inserted into the center bolt insertion hole, and having a flange portion near the lower end having a diameter larger than the inner diameter of the center bolt insertion hole; , Provided at the periphery of the opening of the center bolt insertion hole, and the front and rear left and right sides of the under bracket and the center bolt. Has a relative displacement and a rubber-like elastic material made of a stopper for limiting to a predetermined amount, and to providing a clearance longitudinal and lateral directions between said center bolt stopper.

According to a second aspect of the present invention, there is provided the anti-vibration mount according to the first aspect, wherein a second elastic body made of a rubber-like elastic material is provided at a lower end of the center bolt.

According to a third aspect of the present invention, there is provided the anti-vibration mount according to the first aspect, wherein a dynamic damper is provided at a lower end portion of the center bolt.

When the clearance in the front-rear and left-right directions is provided between the center bolt and the stopper as in the vibration isolating mount according to the first aspect of the present invention having the above structure,
While the clearance is present, the spring constant is low. When the clearance is lost and the center bolt comes into contact with the stopper, the spring constant thereafter increases.

Since the under bolt is connected to the upper bracket by inserting the bolt portion of the under bolt into the bolt insertion hole of the upper bracket, the upper surface of the upper bracket can be widely used as a mounting seat surface. Becomes

Further, when the second elastic body made of a rubber-like elastic material is provided at the lower end of the center bolt as in the vibration isolating mount according to the second aspect of the present invention having the above structure, the load in the vertical direction is increased. Is input, the second elastic body receives this load by compression, and the load on the elastic body can be reduced accordingly. The second elastic body can also function as a vertical stopper.

When setting the spring constants in the up-down direction and in the front-rear direction and the left-right direction, it is possible to tune the shear and the compression in a combined manner by using two elastic bodies composed of an elastic body having different directions and a second elastic body. It becomes possible.

Further, when a dynamic damper is provided at the lower end of the center bolt as in the vibration-proof mount according to the third aspect of the present invention having the above-described structure, the dynamic damper function is exhibited.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

First Embodiment As shown in FIGS. 1 and 2, above a substantially rectangular, flat-plate-shaped underbracket 1, above a substantially rectangular, flat-plate-shaped underbracket, as shown in FIGS. An upper bracket 2 is arranged, and both brackets 1 and 2 are connected by an elastic body 3 made of a rubber-like elastic material and baked on the under bracket 1.

An under bracket 1 formed of a rigid material such as a sheet metal has a lower surface flange portion 1 provided with a mounting hole 1b.
a, the four rising portions 1c, and the upper surface portion 1d are integrally formed, and a center circular through hole 1e is provided in the center of the upper surface portion 1d.

The upper bracket 2 also formed of a rigid material such as a sheet metal has four side surfaces 2a and an upper surface 2a.
b, a bolt insertion hole 2c is provided in the center of the upper surface 2b, and a positioning portion 2d
Is provided.

A pair of elastic bodies 3 formed of a predetermined rubber-like elastic material are arranged in the longitudinal direction of the anti-vibration mount (the left-right direction in FIG. 1). It is baked on the outer surface of the portion 1c and is adhered to the inner surface of the inclined side surface portion 2a of the upper bracket 2.

A center bolt 4 is inserted into a center bolt insertion hole 1e of the under bracket 1.

The center bolt 4 presses the upper end bolt 4a into the bolt insertion hole 2c of the upper bracket 2 from below and presses the upper end of the main body 4b against the lower surface of the upper bracket 2 from below. The main body 4b is fixedly connected to the upper bracket 2 so that the outer diameter of the main body 4b is set smaller than the inner diameter of the center bolt insertion hole 1e. A larger diameter flange portion 4c is provided integrally, and a second elastic body 5 made of a rubber-like elastic material is similarly baked on the lower surface of the lower end portion.

The under bracket 1 is provided at the periphery of the opening of the center bolt insertion hole 1e in the under bracket 1.
A stopper 6 made of a rubber-like elastic material for limiting the relative displacement of the center bolt 4 in the front-rear and left-right directions to a predetermined amount is baked, and the front-rear left-right direction is provided between the stopper 6 and the main body 4b of the center bolt 4. Is provided over the entire circumference.

The stopper 6 is annularly formed of a predetermined rubber-like elastic material and is formed integrally with the elastic body 3. The stopper 6 is provided on the upper surface of the flange 4 c of the center bolt 4. A vertical stopper 8 having a contacting portion 8a and a portion 8b facing the lower surface of the upper surface portion 2b of the upper bracket 2 at a predetermined interval is integrally formed.

Further, only on the inner surface of the rising portion 1c of the under bracket 1 at the longitudinal end, a stopper 9 made of rubber-like elastic material for increasing the spring constant in the left-right direction is provided with the stopper 6 and the upper and lower members. The size A of the clearance 10 between the left-right dedicated stopper 9 and the flange 4c of the center bolt 4 is the same as that of the stopper 6 described above.
Is slightly larger than the size a of the clearance 7 between the main body 4b of the center bolt 4 (A>
a).

The anti-vibration mount having the above configuration is, for example,
A mounting bolt (not shown) is inserted into the mounting hole 1b of the under bracket 1 from above to insert the under bracket 1
Is fixedly attached to a support (not shown),
The center bolt 4 and the upper bracket 2 are fixedly attached to the supported body by screwing the bolt portion 4a of the center bolt 4 into a supported body (not shown) from below. The above-described configuration has the following operational effects. It is characterized by points. When the initial load is input from above, the second elastic body 5 comes into contact with the upper surface of the support.

That is, first, since the clearance 7 in the front-rear and left-right directions is provided between the main body 4b of the center bolt 4 and the stopper 6, at the time of displacement in the front-rear and left-right directions,
When the clearance 7 is present, the spring constant is low, and when the clearance 7 is lost and the main body 4b of the center bolt 4 abuts against the stopper 6, the spring constant thereafter increases, and the spring constant is initially low and subsequently high. Demonstrate step characteristics. Therefore, vibrations having small amplitude can be received softly, and shock vibrations having large amplitude can be received firmly to improve the vibration isolation performance.

The center bolt 4 is fixedly connected to the upper bracket 2 by press-fitting the bolt 4a of the center bolt 4 into the bolt insertion hole 2c of the upper bracket 2, so that the upper surface of the upper bracket 2 is fixed. Widely, it can be used as the mounting seat surface 2e for the supported member. Therefore, the mounting work is easy because of the wide mounting seat surface 2e, and the supported member can be well seated.

Since the second elastic member 5 made of a rubber-like elastic material is provided on the lower surface of the lower end of the center bolt 4, when a vertical load is input, the second elastic member 5 is compressed. Upon receiving this load, the load on the elastic body 3 acting on the load in the vertical direction by shearing can be reduced. Therefore, generation of set (including initial set) on the elastic body 3 can be prevented, and the durability thereof can be improved.

When setting the spring constants in the up-down direction and in the front-rear, left-right directions, tuning is performed in combination with two elastic members, the elastic member 3 and the second elastic member 5 having different directions in shear and compression. It becomes possible. Therefore, the tuning operation can be facilitated by sharing the tuning elements (directions).

The configuration of the anti-vibration mount having the above configuration can be added or changed as follows.

Second embodiment: The second elastic member 5 in the first embodiment shown in FIGS. 1 and 2 is attached to the supporting member and the supported member by mounting the vibration isolating mount to the vibration isolating mount. In the state where the initial load is input from above, the contact is not made to come into contact with the support member to which the under bracket 1 is attached (a vertical clearance is set between the second elastic body 5 and the support member). By doing so, the two-step characteristic of the spring constant is exhibited also in the vertical direction.

Third Embodiment As shown in FIG. 3, the inner diameter of the bolt insertion hole 2c provided on the upper surface 2b of the upper bracket 2 is set slightly larger than the outer diameter of the bolt 4a of the center bolt 4. The center bolt 4 is indirectly connected to the upper bracket 2 by being screwed into the supported member at the bolt portion 4a (the connection by tightening the center bolt 4 is also possible).

Fourth Embodiment As shown in FIG. 4, a dynamic damper having an elastic body 12 made of a rubber-like elastic material and a mass body 13 made of a rigid material such as metal on the lower surface of the lower end of the center bolt 4. 11 is provided. In the illustrated example, the elastic body 1
2 is vulcanized and adhered to the lower surface of the lower end of the center bolt 4 and the upper surface of the mass body 13, and the mass body 13 is suspended. In this way, a dynamic damper function is exerted by the resonance action of the dynamic damper 11, and the input vibration of the resonance target can be attenuated.

Fifth Embodiment As shown in FIG. 5, the second elastic body 5 is provided further below the dynamic damper 11 provided in the fourth embodiment. In the illustrated example, the elastic body 12 of the dynamic damper 11 is vulcanized and bonded to the lower surface of the lower end of the center bolt 4 and the upper surface of the mass body 13 so that the mass body 13 is suspended. It is vulcanized and adhered to the lower surface. In this way, a dynamic damper function by the resonance action of the dynamic damper 11 is exhibited, the input vibration of the resonance target can be attenuated, and the above-described action and effect by providing the second elastic body 5 are exhibited.

[0036]

The present invention has the following effects.

First, in the anti-vibration mount according to the first aspect of the present invention having the above-described structure, since the clearance in the front-rear and left-right directions is provided between the center bolt and the stopper, the displacement in the front-rear and left-right directions is provided. Sometimes, while the clearance is present, the spring constant is low, and when the clearance is lost and the center bolt and the stopper come into contact with each other, the spring constant thereafter increases, the spring constant is initially low, and the two-stage characteristic is high thereafter. Therefore, vibrations having small amplitude can be received softly, and shock vibrations having large amplitude can be received firmly to improve the vibration isolation performance.

Further, since the under bolt is connected to the upper bracket by inserting the bolt portion of the under bolt into the bolt insertion hole of the upper bracket, the upper surface of the upper bracket can be widely used as a mounting seat surface. Becomes Therefore, the mounting work is easy because of the wide mounting seat surface, and the seat to be mounted is good.

In addition, in the vibration isolating mount according to the second aspect of the present invention having the above structure, the second elastic body made of a rubber-like elastic material is provided at the lower end of the center bolt. When a vertical load is input, the second elastic body receives this load by compression, and the load on the elastic body can be reduced accordingly. Therefore, it is possible to prevent generation of set on the elastic body, and it is possible to improve its durability.

When setting the spring constants in the up-down direction and in the front-back and left-right directions, it is possible to tune the shear and the compression in a combined manner by using two elastic bodies composed of an elastic body having different directions and a second elastic body. It becomes possible. Therefore, the tuning operation can be facilitated by sharing the tuning elements (directions).

Further, in the anti-vibration mount according to the third aspect of the present invention having the above-mentioned structure, since the dynamic damper is provided at the lower end of the center bolt,
The dynamic damper function by the resonance action of the dynamic damper is exhibited, and the input vibration of the resonance target can be attenuated.

[Brief description of the drawings]

FIG. 1 is a plan view of an anti-vibration mount according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AOA in FIG. 1;

FIG. 3 is a sectional view of an anti-vibration mount according to a third embodiment of the present invention.

FIG. 4 is a sectional view of an anti-vibration mount according to a fourth embodiment of the present invention.

FIG. 5 is a sectional view of an anti-vibration mount according to a fifth embodiment of the present invention.

FIG. 6 is a plan view of an anti-vibration bush according to a conventional example.

FIG. 7 is a sectional view taken along line BOB in FIG. 6;

[Description of Signs] 1 Under bracket 1a Lower flange portion 1b Mounting hole 1c Rising portion 1d, 2b Upper surface portion 1e Center bolt insertion hole 2 Upper bracket 2a Side surface portion 2c Bolt portion insertion hole 2d Positioning portion 2e Mounting seat surface 3, 12 Elasticity Body 4 Center bolt 4a Bolt part 4b Body part 4c Flange part 5 Second elastic body 6 Stopper 7,10 Clearance 8 Vertical stopper 8a, 8b Part 9 Right and left direction stopper 11 Dynamic damper 13 Mass body

Claims (3)

[Claims] An under bracket (1) attached to one of a support member and a supported member and having a center bolt insertion hole (1e); and an under bracket (1) attached to the other of the support member and the supported member. An upper bracket (2) provided with a bolt portion insertion hole (2c) for a sender bolt (4); an elastic body (3) made of a rubber-like elastic material connecting the brackets (1) and (2); Bolt part (4) inserted into the part insertion hole (2c).
a) a flange portion (4c) which is connected to the upper bracket (2), is inserted into the center bolt insertion hole (1e), and has a larger diameter near the lower end than the inner diameter of the center bolt insertion hole (1e). And a center bolt (4) provided at a peripheral edge of an opening of the center bolt insertion hole (1e), and a predetermined amount of relative displacement between the under bracket (1) and the center bolt (4) in the front-rear and left-right directions. A stopper (6) made of a rubber-like elastic material for limiting the distance between the center bolt (4) and the stopper (6). Anti-vibration mount. 2. The anti-vibration mount according to claim 1, wherein a second elastic body made of a rubber-like elastic material is provided at a lower end of the center bolt. 3. The anti-vibration mount according to claim 1, wherein a dynamic damper (11) is provided at a lower end of the center bolt (4).