JPH11294534A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce production costs while keeping position relation highly accurate. SOLUTION: A bracket has a cylindrical section 12A and a flange section 12B extending in the outer peripheral direction. A pair of leg sections 14 is provided extending so as to protrude toward the outer periphery in the horizontal direction after being bent downward once, and a stay section 12C extends in the direction to cross a pair of the leg sections 14. The outer peripheral face of an elastic body 8 is vulcanizedly adhered to the inner periphery of the cylindrical section 12A of the bracket 12, and an inside cylindrical metal fitting is buried in the central portion of this elastic body 8 while being vulcanized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device for preventing transmission of vibration from a vibration generating section, and more particularly to a mount for supporting a member such as an engine which generates vibration. Applicable.

[0002]

2. Description of the Related Art For example, a vibration isolator as an engine mount is provided between an engine serving as a vibration generating portion of a vehicle and a vehicle body serving as a vibration receiving portion. Is absorbed and is prevented from being transmitted to the vehicle body.

As one example, a vibration isolator 110 as shown in FIGS. 8 and 9 is known and will be described below.

[0004] As shown in these figures, this vibration isolator 1
An elastic body 118 made of rubber is disposed between the outer cylindrical fitting 120 and the inner cylindrical fitting 116 by vulcanization bonding to these fittings, and the outer cylindrical fitting 120 is inserted into the bracket 114.

Although the conventional vibration isolator is provided with a body-side fastening portion 122 and a stay portion 124 as legs, the height of the body-side fastening portion 122 and the height of the stay portion 124 are increased. Since these are different from each other, as shown in FIGS. 8 and 9, the body-side fastening portion 122 and the stay portion 124 which are separate from the bracket 114 are attached to the bracket 114 by welding or the like.

[0006] However, as shown in FIG.
Is integrally formed with the bracket 114, but the body side fastening portion 122 is welded to the bracket 114 as a separate fitting, or the body side fastening portion 122 is
4, but a structure in which the stay portion 124 is welded as a separate fitting is also considered.

[0007]

However, in the above-described conventional vibration isolator 110, the body side fastening portion 122,
Since the stay portion 124 and the like are separately formed and welded to the bracket 114, there is a disadvantage that the number of molds increases and the manufacturing cost increases.

Further, since the body-side fastening portion 122 and the stay portion 124 are attached to the bracket 114 by welding, the mounting position of the body-side fastening portion 122 and the stay portion 124 with respect to the center of the vibration isolator 110 is made to be highly accurate. It was difficult.

Further, the flange 114 is attached to the bracket 114.
In the case where the flange 26 is formed and the flange 126 constitutes a bound-side stopper, a force for bending the flange 126 is applied to the root of the flange 126, so that the strength of the root is insufficient. Therefore, as a countermeasure, it is conceivable to provide a reinforcing plate 128 as shown in FIG. 11, but the addition of the reinforcing plate 128 causes an increase in manufacturing cost.

The present invention has been made in view of the above circumstances, and has as its object to provide an anti-vibration device which has a high positional accuracy and a reduced manufacturing cost.

[0011]

According to a first aspect of the present invention, there is provided an anti-vibration device having an outer portion integrally formed with a mounting piece connected to one of a vibration generating portion and a vibration receiving portion and a cylindrical portion formed in a cylindrical shape. A member, an inner member connected to the other of the vibration generating portion and the vibration receiving portion and located on the inner peripheral side of the cylindrical portion of the outer member, and an inner member disposed between the inner member and the cylindrical portion of the outer member. And an elastic body elastically connecting the outer member and the outer member, wherein a flange portion as a stopper for preventing excessive movement of the inner member is provided on the outer peripheral side of the cylindrical portion of the outer member. By bending the base of the flange, at least a part of the mounting piece is arranged at a position having a step with respect to the flange.

The operation of the vibration isolator according to the first aspect will be described below. An outer member integrally forms a mounting piece portion connected to one of the vibration generating portion and the vibration receiving portion and a cylindrical portion formed in a tubular shape, and an inner member connected to the other of the vibration generating portion and the vibration receiving portion. Is located on the inner peripheral side of the cylindrical portion of the outer member. Further, an elastic body disposed between the inner member and the outer member connects the inner member and the outer member so as to be elastically deformable.

Also, a flange portion as a stopper for preventing excessive movement of the inner member is provided on the outer peripheral side of the cylindrical portion of the outer member, and the root of the flange portion is bent to have a step with respect to the flange portion. At least a part of the mounting piece is disposed at the position where the mounting piece is located.

Therefore, when the vibration is transmitted from the vibration generating portion connected to the outer member or the inner member, the elastic body is deformed, and the vibration is attenuated by the deformation of the elastic body. Vibration is less likely to be transmitted to the connected vibration receiver.

Further, since the mounting piece is formed integrally with the cylinder on the outer member, the manufacturing cost of the vibration isolator can be reduced while the positional relationship between the mounting piece and the cylinder is made highly accurate. Was.

Furthermore, the same effect as the rib is provided at the root of the bent flange portion so that the strength is not insufficient, so that the strength of this portion can be increased without providing a reinforcing plate, and the flange as a stopper can be provided. Even when a force to bend the flange portion is applied to the base of the portion, the flange portion is not easily deformed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a vibration isolator according to the present invention is shown in FIGS. 1 to 5, and this embodiment will be described with reference to these drawings.

As shown in FIG. 1 showing the present embodiment, a bracket 12 having a cylindrical portion 12A formed in a cylindrical shape and having a flange portion 12B extending to the outer periphery provided on the upper portion of the cylindrical portion 12A prevents this. The outer member of the vibration device 10 is configured.

As shown in FIG. 5, this flange portion 12B
Is provided with a pair of legs 14 that bend the root of the flange portion 12B downward and then protrude outward in the horizontal direction, respectively, and further intersect with the pair of legs 14. A stay portion 12C for supporting the vibration isolator 10 extends so as to protrude from the bracket 12 along the direction in which the bracket 12 extends.

That is, the cylindrical portion 12A and the flange portion 1
The bracket 12 is formed by integrally forming the 2B, the leg portion 14, and the stay portion 12C.
And the stay 12C constitute a mounting piece.

Further, as shown in FIG.
The outer peripheral surface of a rubber elastic body 8 formed in a cylindrical shape is vulcanized and bonded to the inner peripheral surface of the cylindrical portion 12A, and the bracket 12 surrounds and holds the elastic body 8. A plurality of holes 8A are formed in the elastic body 8 along the circumferential direction as shown in FIG. 5, and a stopper rubber connected to the elastic body 8 is provided above the flange 12B of the bracket 12. 19 is vulcanized.

Further, at the center of the elastic body 8 on the inner peripheral side of the bracket 12, an inner cylindrical metal member 24, which is an inner member made of metal and formed in a conical shape, is embedded while being vulcanized and bonded. The upper end of the inner tube fitting 24 projects from the elastic body 8. The inner cylindrical fitting 24 is provided with a screw hole 24A formed with a female screw, and a detent pin 25 is attached thereto.

As described above, the elastic body 8 is disposed and attached between the inner cylindrical fitting 24 and the cylindrical part 12A of the bracket 12, and the inner cylindrical fitting 24 and the elastic body 8 are attached to the cylindrical part 12A of the bracket 12. And the elastic body 8 connects the inner tube fitting 24 and the bracket 12 so as to be elastically deformable.

As shown in FIG. 1 and FIG.
An arm bracket 26 is disposed at a position facing the upper end, which is the top surface, through a stopper rubber 22 made of rubber and elastically deformable.

That is, into the cylindrical stopper rubber 22, the prism portion 26A constituting one end of the arm bracket 26 made of iron casting or the like is press-fitted.
2 is configured to cover one end of the arm bracket 26.

Further, a prism 26 is provided in the stopper rubber 22.
A is press-fitted, and a hole 22A formed in the upper wall of the stopper rubber 22 and a through-hole 27 formed in the prism 26A are formed.
A and an opening 22 formed in the lower wall of the stopper rubber 22
B, a stopper bolt 28 is inserted from above, and the stopper bolt 28 is screwed into a screw hole 24A of the inner cylinder fitting 24, so that the arm bracket 26 is fixed to the inner cylinder fitting 24.

A bolt 29 for connecting the arm bracket 26 to an engine (not shown) serving as a vibration generator is fixed to the other end of the arm bracket 26. Therefore, the inner cylindrical fitting 2 protruding from the elastic body 8
4 will be used for connection to the engine,
The inner tube fitting 24 is connected to the engine serving as a vibration generating unit via the arm bracket 26.

Accordingly, the stopper rubber 19 located below the arm bracket 26 and the flange portion 12B to which the stopper rubber 19 is vulcanized are moved relative to the lower side of the arm bracket 26. It becomes a bound stopper that restricts it within a certain range.

On the other hand, a rebound stopper metal fitting 60 for restricting the relative movement of the inner metal fitting 24 to the bracket 12 to the upper side with respect to the arm bracket 26 to a certain range is provided on the upper part of the inner metal fitting 24. 26
And is disposed so as to face the inner tube fitting 24 via the. In FIG. 3, in a state where the rebound stopper fitting 60 formed in an inverted U shape sandwiches the pair of legs 14, the bent both ends of the rebound stopper fitting 60 are connected to the pair of legs 14. Abut.

Through holes 14A and 60A are formed in both ends of the rebound stopper fitting 60 and the leg 14, respectively. The through holes 14A and the rebound of the leg 14 are formed by a pair of set screws 64 shown in FIG. The through-hole 60A of the stopper 60 is integrally penetrated, and the through-hole 12D is also formed in the stay portion 12C. The through-hole 12D of the stay portion 12C is penetrated by a set screw (not shown) to serve as a vibration receiving portion. The vibration isolator 10 is fixed to the vehicle body 62 by being fastened to the vehicle body 62, respectively.

That is, the bracket 12 is
2 and a pair of leg portions 14 and stay portions 1 formed on the outer peripheral side of
It will be connected to the vehicle body 62 via 2C.

Next, a procedure for manufacturing the vibration isolator 10 according to the present embodiment will be described. First, by pressing, the cylindrical portion 12A, the flange portion 12B, the leg portion 14, and the stay portion 12 are formed.
The bracket 12 integrally having C is formed, and the inner tube fitting 24 and the bracket 12 are put in a mold, and the elastic body 8 is vulcanized as shown in FIGS.

Then, the prism 26A of the arm bracket 26 is press-fitted into the stopper rubber 22 shown in FIG. 4, and a stopper bolt 28 is inserted through the stopper rubber 22 and the arm bracket 26. 24
To fix the arm bracket 26 to the inner tube fitting 24.

Next, a pair of legs 14 formed so as to protrude from the bracket 12 is sandwiched between rebound stopper fittings 60, and the pair of legs 14 are attached to the rebound stopper fittings 6.
By temporarily fixing 0, the assembly is completed as shown in FIGS.

Thereafter, the vibration isolator 1 thus completed is completed.
0 is installed in the vehicle, a pair of setscrews 64 are passed through the pair of legs 14 and both ends of the rebound stopper fitting 60 and fastened to the vehicle body 62, and a set screw (not shown) is passed through the stay portion 12 </ b> C and the vehicle body 62. As shown in FIG. 3, the pair of leg portions 14 and stay portions 12
The bracket 12 connected to C and the rebound stopper fitting 60 are fixed to the vehicle body 62, and the vibration isolator 10 can be mounted on the vehicle body 62. Then, the arm bracket 26
Bolt 29 on the engine to attach the arm bracket 2
6 are connected.

Next, the operation of the present embodiment will be described. Tube part 12A, flange part 12B, leg part 14, stay part 12
The bracket 12 is integrally formed with the bracket C, and the bracket 12 is connected to the vehicle body 62 via the legs 14 and the stays 12C. Also, an inner cylindrical fitting 24 is located on the inner peripheral side of the cylindrical portion 12A of the bracket 12, one end of the arm bracket 26 is fixed to an end of the inner cylindrical fitting 24, and the other end of the arm bracket 26 is fixed to the other end. Connected to the engine. Further, the elastic body 8 arranged between the inner cylindrical fitting 24 and the cylindrical portion 12A of the bracket 12 is provided with the inner cylindrical fitting 24.
And the bracket 12 are connected so as to be elastically deformable.

Accordingly, when the engine mounted on the inner cylinder 24 via the arm bracket 26 operates, the vibration of the engine is transmitted to the elastic body 8 via the arm bracket 26 and the inner cylinder 24. The elastic body 8 acts as a vibration absorbing main body, and can absorb vibration by a vibration damping function based on internal friction of the elastic body 8.

Also, since the leg 14 and the stay 12C, which are the mounting pieces, are integrally formed on the bracket 12 with the cylindrical part 12A, the positional relationship between the mounting piece and the cylindrical part 12A is improved. The manufacturing cost of the vibration isolator 10 can be reduced while maintaining accuracy.

That is, when a separate object is welded to the bracket, there are problems such as jig accuracy during welding and welding distortion in addition to the dimensional accuracy of the press die. On the other hand, if the bracket is integrally formed by press working as in the present embodiment, the positional accuracy of the leg portion 14 and the stay portion 12C in a top view is determined only by the dimensional accuracy of the press die. Therefore, the accuracy is high.

Further, by integrally forming the bracket, costs such as welding cost and jig cost are not required. In addition, when welding a separate body to the bracket, a blank mold, a drawing mold, and a bending mold are required for each member such as a plurality of molds for the legs and a plurality of molds for the cylinder. Although the manufacturing cost is increased, the total number of molds is reduced by integrally molding, so that the manufacturing cost can be reduced.

On the other hand, when vibration of excessive amplitude is input from the engine, the flange 1 of the bracket 12
When the arm bracket 26 abuts on the stopper rubber 19 bonded to the 2B, the relative movement of the inner cylindrical fitting 24 to the bracket 12 below the bracket 12 can be restricted.
In addition, since the arm bracket 26 abuts on the rebound stopper metal fitting 60 which is installed on the bracket 12 and is located opposite to one end of the arm bracket 26, the relative movement of the inner cylindrical metal fitting 24 to the bracket 12 in the upward direction is restricted. can do.

That is, in the present embodiment, as shown in FIG. 3, the flange portion 12B as a bound stopper for preventing the
Is provided on the outer peripheral side of the cylindrical portion 12A, and the root of the flange portion 12B is bent at the bent portion 12E, thereby forming the flange portion 1A.
The through hole 14 of the leg 14 is located at a position having a step with respect to 2B.
A is arranged.

Accordingly, since the bent portion 12E has the same effect as the rib so that the strength is not insufficient, the strength of this portion can be increased without providing a reinforcing plate.
For this reason, even if a force to bend the flange portion 12B is applied to the base of the flange portion 12B as a bound stopper, the flange portion 12B is less likely to be deformed.

Next, a second embodiment of the vibration isolator according to the present invention is shown in FIGS. 6 and 7, and this embodiment will be described with reference to these drawings. The illustration and description of the same members as in the first embodiment are omitted.

As shown in FIG. 6 showing the present embodiment, a bracket 12 constitutes an outer member of the vibration isolator 100 in the same manner as in the first embodiment. An outer tube fitting 16 having a portion 16 </ b> A is press-fitted into the bracket 12 and disposed inside the bracket 12.

An outer peripheral surface of a rubber elastic body 18 formed in a cylindrical shape and having an inter-ring 20 embedded therein is vulcanized and bonded to the inner peripheral surface of the outer cylindrical member 16. 16 surrounds and holds the elastic body 18. The elastic body 18 corresponding to the lower part of the outer tube fitting 16
Is a thin portion 18A which is made thin.

Further, the elastic member 1 on the inner peripheral side of the outer cylindrical member 16 is provided.
8, an inner cylindrical metal fitting 24, which is an inner member made of metal and formed in a conical shape, as in the first embodiment.
Are embedded while being vulcanized and bonded.
Has an upper end projecting from the elastic body 18.

As described above, the elastic body 18 is disposed and attached between the inner cylindrical fitting 24 and the outer cylindrical fitting 16, and the outer cylindrical fitting 16 is press-fitted into the bracket 12, so that the outer cylindrical fitting 16, The inner cylinder 24 and the elastic body 18 are housed in the bracket 12, and as a result, the elastic body 18 connects the inner cylinder 24 and the bracket 12 via the outer cylinder 16 so as to be elastically deformable. .

On the other hand, a rubber diaphragm 30 is provided on the inner peripheral surface.
The ring material 31 to which is adhered by vulcanization is fitted and fixed inside the lower part of the outer tube fitting 16. This diaphragm 30
A liquid chamber 32 in which an inner wall surface is formed by these members is provided between the elastic body 18 and the elastic body 18, and a liquid such as water or oil is sealed therein. In the liquid chamber 32, a partition member 34 formed of, for example, a synthetic resin material is provided.
The liquid chamber 32 is fitted to the inner wall surface of the thin portion 18A of the elastic body 18 and is formed into a main liquid chamber 32A as a pair of small liquid chambers.
And the auxiliary liquid chamber 32B.

Further, at the center of the partition member 34,
A circular opening 38 is formed, and a groove 36 formed in a groove shape is formed substantially along the outer peripheral end 34B inside the outer peripheral end 34B which is the outer peripheral surface of the partition member 34. Have been. At one end of the groove 36, a small hole 52 communicating the main liquid chamber 32A and the inside of the groove 36 is formed, and at the other end, a small hole 54 communicating the sub liquid chamber 32B and the inside of the groove 36 is formed. Is formed. Therefore, the elastic body 1
8, the groove 36 and the small hole 52 closed by the inner wall surface,
54 constitutes the orifice 42 communicating between the main liquid chamber 32A and the sub liquid chamber 32B. Further, an air chamber 44 is provided between the diaphragm 30 and the bottom wall of the bracket 12.

On the other hand, a rib 34A protruding above the opening 38 is formed in the partition wall member 34, and a membrane 46, which is an elastic plate whose central portion protrudes in a circular shape, is engaged with the rib 34A. ing.

At the lower part of the membrane 46 near the outer periphery, the outer peripheral end is formed by the diaphragm 30 and the partition member 34.
And a circular metal plate 48 protruding in a circular shape so that the central portion is fitted into the opening portion 38, and the membrane 46 is sandwiched between the ribs 34A. ing. In addition, a hole is provided at the position of the disk 48 corresponding to the small hole 54 as shown in the figure.

Next, the anti-vibration device 100 according to the present embodiment will be described.
Will be described. First, the outer cylinder 16 is formed by press working, and the inner cylinder 24 and the outer cylinder 16 are formed.
Is put in a mold, and the elastic body 18 is vulcanized. Then, in the liquid, the partition member 34 with the membrane 46 and the disk 48 attached thereto, the diaphragm 30, and the like are inserted into the outer cylindrical member 16, and the partition member 34 is inserted into the protruding portion on the inner peripheral side of the outer cylindrical member 16. The lower part of the outer cylindrical member 16 is drawn and the lower end of the outer cylindrical member 16 is caulked to form a tapered shape while engaging the outer peripheral side of the outer cylindrical member 16 to position the partition member 34 in the axial direction.

As a result, these members are connected to the outer tube fitting 16.
In addition to being housed inside, the thin wall portion 18A of the elastic body 18 and the partition member 34 are fitted while closely contacting each other, and the space between the pair of liquid chambers 32A and 32B is sealed by the partition member 34. , The state shown in FIG.

Then, as in the first embodiment, the prism portion 26A of the arm bracket 26 is provided in the stopper rubber 22.
Into the stopper rubber 22 and the arm bracket 26.
The fixing bolt 28 is inserted into the arm bracket 2 by screwing the fixing bolt 28 to the inner cylindrical metal fitting 24.
6 is fixed to the inner tube fitting 24.

Next, the inner cylinder 24, the outer cylinder 16, and the elastic body 18 are pressed while the outer cylinder 16 is pressed into the bracket 12.
Is stored in the bracket 12. Thereafter, the rebound stopper fitting 60 is temporarily fixed in the same manner as in the first embodiment, whereby the vibration isolator 100 is completed as shown in FIG. 6, and the completed vibration isolator 100 is mounted in the first embodiment. In the same manner as in the first embodiment, it can be arranged between the vehicle body 62 and the engine.

Next, the operation of the present embodiment will be described. This embodiment operates similarly to the first embodiment, but has the following differences.

First, the outer cylindrical metal fitting 16 formed in a cylindrical shape is
The bracket 12 is connected to the vehicle body 62 via the legs 14 and the stays 12C. An inner cylinder 24 is located on the inner peripheral side of the outer cylinder 16, and one end of an arm bracket 26 is fixed to an end of the inner cylinder 24, and the other end of the arm bracket 26 is connected to the engine. Be linked. Further, the elastic body 18 disposed between the inner cylindrical fitting 24 and the outer cylindrical fitting 16 includes the inner cylindrical fitting 24 and the outer cylindrical fitting 1.
6 is connected so as to be elastically deformable.

Accordingly, when the engine mounted on the inner cylinder 24 via the arm bracket 26 operates, the vibration of the engine is transmitted to the elastic body 18 via the arm bracket 26 and the inner cylinder 24.

The elastic body 18 acts as a vibration absorbing main body, and can absorb vibration by a vibration damping function based on internal friction of the elastic body 18. Further, the main liquid chamber 32A and the sub liquid chamber 3
The liquid in 2B circulates through orifice 42 to each other,
The damping effect based on the pressure change of the liquid generated in the orifice space, the viscous resistance of the liquid flow, and the like can improve the vibration isolation effect.

On the other hand, even when the orifice 42 capable of reducing a narrow frequency range is clogged and vibration is not sufficiently reduced by the orifice 42 alone, for example, when high-frequency vibration is transmitted, the membrane 46 can be used. Is not elastically deformed and the internal pressure in the liquid chamber 32 does not increase. As a result, even if a high frequency vibration that cannot be reduced by the orifice 42 is generated, the orifice 42 becomes a low dynamic spring, the vibration isolating characteristics are maintained without being reduced, and the effect of the vibration isolating device 100 is sufficiently exhibited.

In the above embodiment, the arm bracket 26 and the inner cylinder 2
4 side, and a bracket 1 is attached to the vehicle body 62 which is a vibration receiving portion.
2 and the outer tube 16 are connected.
The reverse configuration may be adopted.

On the other hand, in the embodiment, the purpose of the present invention is to dampen an engine mounted on a vehicle. However, the anti-vibration device of the present invention is used for, for example, a vehicle body mount or other uses other than the vehicle. Needless to say,
The shape and size of the elastic body and the number of orifices are not limited to those of the embodiment.

[0064]

As described above, the vibration isolator according to the present invention has an excellent effect that the manufacturing cost can be reduced while the positional relationship is made highly accurate.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a first embodiment of a vibration isolator according to the present invention.

FIG. 2 is a side view showing the first embodiment of the vibration isolator according to the present invention.

FIG. 3 is another side view showing the first embodiment of the vibration isolator according to the present invention.

FIG. 4 is a cross-sectional view for explaining the assembly of the first embodiment of the vibration isolator according to the present invention.

FIG. 5 is a perspective view of the bracket applied to the first embodiment of the vibration isolator according to the present invention and in which an elastic body is vulcanized and adhered.

FIG. 6 is a partial sectional view showing a second embodiment of the vibration isolator according to the present invention.

FIG. 7 is a cross-sectional view for explaining the assembly of a second embodiment of the vibration isolator according to the present invention.

FIG. 8 is a cross-sectional view showing a vibration isolator according to a first related art.

FIG. 9 is a side view showing a vibration isolator according to a first related art.

FIG. 10 is a side view showing a vibration isolator according to a second conventional technique.

FIG. 11 is a side view showing a vibration isolator according to a third conventional technique.

[Explanation of symbols]

 Reference Signs List 8 elastic body 10 anti-vibration device 12 bracket 16 outer cylinder 18 elastic body 24 inner cylinder 100 vibration isolator

Claims (1)

[Claims] An outer member integrally formed with a mounting piece connected to one of the vibration generating section and the vibration receiving section and a cylindrical section formed in a cylindrical shape; and the other of the vibration generating section and the vibration receiving section. An inner member connected and positioned on the inner peripheral side of the cylindrical portion of the outer member; an elastic body disposed between the inner member and the cylindrical portion of the outer member to elastically deform and connect the inner member and the outer member. And a flange portion as a stopper for preventing excessive movement of the inner member is provided on the outer peripheral side of the cylindrical portion of the outer member, and a root of the flange portion is bent to thereby provide a flange. A vibration isolator, wherein at least a part of the mounting piece is disposed at a position having a step with respect to the part.