JPH10318311A - Vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of production by making improvements in workability and assembleability. SOLUTION: An elastic body 18 is installed in a space between an inner cylinder fitting 24 and an outer cylinder fitting 16. Bound stopper rubber 60 limiting a relative movement of the inner cylinder fitting 24 to the outer cylinder fitting 16, to a point within the specified range by way of coming into contact with a supporting surface 20A of an upper tubular fitting 20, it attached to a fitting tubular part 24A of the inner cylinder fitting 24 so as to be opposed to the upper tubular fitting 20. In brief, while a projection 76 made up in a hole part 74 of the bound stopper rubber 60 is engaging with a groove part 72 of the fitting tubular part 24A, this hole part 74 is fitted in the fitting tubular part 24A, whereby the bound stopper rubber 60 is situated after being opposed to the upper tubular fitting 20.

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. 6 and 7 is known, and will be described below.

[0004] As shown in these figures, this vibration isolator 1
10 outer cylinder fitting 120 and inner cylinder fitting 116 as an inner member
An elastic body 118 made of rubber is vulcanized and bonded to these metal fittings, and an upper cylindrical metal fitting 126 caulked to the outer cylindrical metal fitting 120 is arranged on the upper side of the outer cylindrical metal fitting 120. I have.

A rubber bound stopper rubber 11 is also provided.
2 is a mounting plate 114 which is a metal fitting vulcanized and bonded to
Are sandwiched between an arm bracket 128 connected to the engine and the inner cylinder fitting 116 and are fastened together by bolts (not shown), so that the bound stopper rubber 112 is fixed to the inner cylinder fitting 116.

That is, these bound stopper rubbers 11
A stopper member formed by the second and mounting plates 114 and the upper cylindrical fitting 126 constitute a bound stopper mechanism. The inner cylindrical fitting 116 moves up and down, and the bound stopper rubber 112 is attached to the upper cylindrical fitting 126. The contact makes it possible to cope with vibration having an excessive amplitude. The bound stopper rubber 112 made of a rubber material also serves as a cushioning material at this time.

[0007] Further, a liquid chamber 124 is provided between the diaphragm 122 and the elastic body 118 disposed in the outer tube fitting 120, and the liquid chamber 124 is formed by a pair of liquid chambers 124A and 124A.
A partition member 130 having a partition 4B and having an orifice 132 is provided in the liquid chamber 124.

Accordingly, when the mounted engine operates and generates vibration, the elastic body 118 has a vibration damping function and
Vibration is absorbed by viscous resistance or the like of the liquid in the orifice 132 communicating between the two liquid chambers 124A and 124B, and transmission of the vibration is prevented.

[0009]

However, in the above-described conventional vibration damping device 110, the bound stopper rubber 11 is used.
At the time of manufacturing 2, the mounting plate 114 needs to be vulcanized and bonded to the bound stopper rubber 112, so that the workability is reduced and the manufacturing cost of the vibration isolator is increased.

Further, since positioning between the mounting plate 114 and the inner cylinder fitting 116, positioning between the mounting plate 114 and the arm bracket 128, and rotation stop are required, the mounting plate 114 has a complicated shape. Become. For this reason, the rubber material easily protrudes from the bound stopper rubber 112, and it is difficult to finish the rubber material protruding from the fastening surface with the inner cylinder fitting 116 and the arm bracket 128, which further increases the manufacturing cost. Was.

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 improved workability and assemblability and reduced manufacturing costs.

[0012]

According to a first aspect of the present invention, there is provided an anti-vibration device which is connected to one of a vibration generating portion and a vibration receiving portion and is formed in a cylindrical shape, and is located on an inner peripheral side of the outer member. An inner member connected to the other of the vibration generating portion and the vibration receiving portion and having a groove formed on the outer peripheral surface, and disposed between the inner member and the outer member so that the inner member and the outer member can be elastically deformed. An elastic body to be connected and a hole having a protrusion on the inner peripheral surface are formed, and the hole is fitted to the inner member while the protrusion is engaged with the groove of the inner member, and the hole faces the outer member. And a stopper member that can restrict relative movement of the inner member with respect to the outer member by being in contact with the outer member.

According to a second aspect of the present invention, in the vibration isolator of the first aspect, the stopper member is integrally formed of a rubber material while the convex portion is formed in a ring shape. The inner diameter of the convex portion is smaller than the outer diameter of the bottom portion of the groove which engages with the convex portion.

The operation of the vibration isolator according to the first aspect will be described below. An outer member formed in a cylindrical shape is connected to one of the vibration generator and the vibration receiver, and an inner member located on the inner peripheral side of the outer member is connected to the other of the vibration generator and the vibration receiver. 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.

Accordingly, when the vibration is transmitted from the vibration generating portion connected to the outer member or the inner member, the elastic member is deformed, and the vibration is attenuated by the deformation of the elastic member, and the elastic member is connected to the inner member or the outer member. Vibration is less likely to be transmitted to the vibration receiving unit side.

Further, when vibration having an excessive amplitude is inputted, the stopper member which is fitted to the inner member at the hole and is located opposite to the outer member comes into contact with the outer member, whereby the inner member with respect to the outer member is With this, the protrusion formed on the stopper member is engaged with the groove formed on the outer peripheral surface of the inner member, whereby the fitting between the stopper member and the inner member is restricted. Sealing the parts prevents water, earth and sand from accumulating on the body of the vibration isolator.

As described above, since the hole is fitted into the inner member while the projection is engaged with the groove of the inner member, there is no need to attach the mounting plate to the stopper member. Need not be vulcanized to the stopper material. Furthermore, since there is no mounting plate, positioning between the mounting plate and the inner member, positioning between the mounting plate and the arm bracket, and
A detent or the like becomes unnecessary, and accordingly, the rubber material hardly protrudes from the stopper material, and the finishing of the rubber material protruding from the stopper material becomes unnecessary.

As a result, the workability and the assemblability can be improved and the manufacturing cost of the vibration isolator can be reduced.

The operation of the vibration isolator according to claim 2 will be described below. The present invention has the same function as the first embodiment. However, in the present invention, the stopper member is integrally formed of a rubber material while the convex portion is formed in a ring shape, and the inner diameter of the hole portion is made smaller than the outer diameter of the portion of the inner member fitted with the hole portion, and The inner diameter of the projection is smaller than the outer diameter of the bottom of the groove that engages with the projection.

Therefore, when they are fitted and engaged, the stopper member and the inner member are firmly fitted by the elastic deformation of the stopper member, and the space therebetween is securely sealed. Water, earth and sand, and oil do not collect on the main body of the vibration isolator.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One 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, an outer cylinder fitting 16 is formed in a cylindrical shape at a lower portion of the outer member of the vibration isolator 10. Further, a disc-shaped flange portion 16A is formed at the upper end of the outer tube fitting 16, and the outer tube fitting 1 is provided on the upper side of the outer tube fitting 16.
The lower part of the upper cylindrical fitting 20 having substantially the same diameter as that of the upper cylindrical fitting 20 is caulked by the flange 16A.
Are arranged while being fixed. That is, the outer tube fitting 1
The outer member is constituted by 6 and the upper cylindrical fitting 20.

A through hole 22 is formed in the center of the support surface 20A which forms the upper surface of the upper cylindrical fitting 20.

Further, on the outer peripheral side of the outer tube fitting 16, FIG.
As shown in FIG. 3, three legs 14 each having an L-shape and each having a through hole 14 </ b> A are provided by welding to the outer peripheral side of the outer metal fitting 16.

On the other hand, an outer peripheral surface of a rubber elastic body 18 formed into a cylindrical shape is vulcanized and adhered to the inner peripheral surface of the outer cylindrical fitting 16, and the outer cylindrical fitting 16 surrounds the elastic body 18. Will be held. The portion of the elastic body 18 corresponding to the lower side of the outer tube fitting 16 is a thin portion 18A which is made thin.

Further, the elastic body 1 on the inner peripheral side of the outer cylindrical fitting 16 is provided.
8 has an inner cylindrical metal fitting 24 as a metal inner member.
Are embedded while being vulcanized and bonded.
Fitting portion 24A projecting upward from elastic body 18
Are formed, and the fitting tube portion 24A penetrates the through hole 22 described above. Then, the fitting tube portion 24 of the inner tube fitting 24 is formed.
A is provided with a screw hole 24B in which a female screw is formed.

The fitting tube portion 24A of the inner tube fitting 24 has
A rubber bound stopper rubber 6 serving as a stopper member for restricting the relative movement of the inner cylindrical member 24 with respect to the outer cylindrical member 16 to a certain range by contacting the support surface 20A of the upper cylindrical member 20.
0 covers the upper cylindrical fitting 20 so as to cover the upper cylindrical fitting 20.
It is attached while facing.

That is, a groove 72 is formed over the entire outer peripheral surface of the fitting cylindrical portion 24A of the inner cylindrical metal fitting 24, a hole 74 is formed in the bound stopper rubber 60, and an inner peripheral surface of the hole 74 is formed. A convex portion 76 is provided to protrude over the entire circumference. The convex portion 76 is engaged with the groove portion 72 of the fitting cylindrical portion 24A, and the hole portion 74 is fitted into the fitting cylindrical portion 24A, so that the bound stopper rubber 60 is formed. Is the upper cylindrical fitting 20
And is located opposite.

Accordingly, the inner cylindrical fitting 24 is moved in the X direction in FIG. This limits the relative movement of the cylindrical portion 24A.

On the other hand, the arm bracket 2 as a mounting member
6, a stop bolt 28 is inserted from above into a through hole 27A formed in one end portion 26A of the inner cylinder fitting 24.
4B, the fixing bolt 28 is screwed into the fitting cylindrical portion 24.
An arm bracket 26 is fixedly disposed on the top surface of A.

At the other end of the arm bracket 26, a bolt hole (not shown) for connecting the arm bracket 26 to an engine (not shown) serving as a vibration generator is formed. Therefore, the inner cylindrical fitting 24 protruding from the elastic body 18 is used for connection to the engine, and the inner cylindrical fitting 24 is connected to the engine serving as the vibration generating unit via the arm bracket 26. .

2 and 3, only one set screw 64 (shown only) penetrates the through hole 14A of the leg portion 14, thereby being fastened to the vehicle body 62 serving as a vibration receiving portion.
2, the vibration isolator 10 is fixed. That is, the outer tube fitting 16
Are three leg portions 14 formed on the outer peripheral side of the outer cylinder fitting 16.
Through the vehicle body 62.

On the other hand, the lower part of the outer tube fitting 16 includes
A rubber diaphragm 30 is arranged.

A liquid chamber 32 having an inner wall formed by these members is provided between the diaphragm 30 and the elastic body 18 and is filled with a liquid such as water or oil. In the liquid chamber 32, a partition member 34 made of, for example, a synthetic resin material is provided.
The liquid chamber 32 is fitted to the inner wall surface of the thin wall portion 8A, and is positioned and arranged in the axial direction by engaging the outer peripheral side with the upper end portion of the thin portion 18A. 32A
And the auxiliary liquid chamber 32B.

The partition member 34 is formed by combining an upper component member 34A formed in a ring shape and a lower component member 34B formed in a disk shape. It has a shape in which a circular concave portion 38 is formed.

Further, the upper component member 34 of the partition member 34
An outer peripheral portion of a membrane 46 as an elastic plate is sandwiched between A and the lower component member 34B and at a position bisecting the concave portion 38.

A groove 36 formed in a groove shape over substantially the entire circumference along the outer peripheral end 34C is provided on an outer peripheral end 34C serving as the outer peripheral surface of the partition member 34. 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 groove 36 and the small holes 52 and 54 closed by the inner wall surface of the elastic body 18 constitute the orifice 42 communicating between the main liquid chamber 32A and the sub liquid chamber 32B.

Further, the bottom plate 12 having a pair of holes 12A is disposed so as to substantially cover the lower side of the outer tube 16 and a caulking portion 16B which is a portion closer to the lower side of the outer tube 16. Is bent so that the portion of the bottom plate 12 near the outer periphery and the portion of the diaphragm 30 near the outer periphery are sandwiched between the partition member 34 and the caulked portion 16B. In addition, an air chamber 44 is provided between the diaphragm 30 and the bottom plate 12 so that the diaphragm 30 can be deformed.

Next, a procedure for manufacturing the vibration isolator 10 according to the present embodiment will be described. First, the inner cylinder 24 and the outer cylinder 16 are placed in a mold, and the elastic body 18 is vulcanized.

Then, the three legs 14 are attached to the outer tube fitting 16, and the partition member 34 and the diaphragm 30 with the membrane 46 attached thereto are inserted into the outer tube fitting 16 in a liquid. The lower end portion of the tube fitting 16 is swaged to form a swaged portion 16B.

As a result, these members are connected to the outer tube fitting 16.
Liquid chambers 32A, 32B
The space is sealed by the partition member 34 and the liquid chamber 32
The lower part of B is sealed by the diaphragm 30 to be in a state as shown in FIG.

Further, the bound stopper rubber 60 is integrally formed of a rubber material while the convex portion 76 is formed in the hole 74 in a ring shape. At this time, the inner diameter A1 of the hole 74 shown in FIG.
Is the outer diameter B of the cylindrical fitting tube portion 24A which fits the hole 74.
1, and the inner diameter A2 of the convex portion 76 is formed smaller than the outer diameter B2 of the bottom portion of the groove 72 engaging with the convex portion 76.

Thereafter, the upper tubular fitting 20 is connected to the outer tubular fitting 16.
After fitting the convex portion 76 of the bound stopper rubber 60 to the groove portion 72 of the fitting cylindrical portion 24A, the fitting cylindrical portion 24A and the hole 74 are tightly fitted to each other. The rubber 60 is attached to the fitting tube portion 24A.

Then, a fixing bolt 28 is inserted into the arm bracket 26, and the fixing bolt 28 is
4, the arm bracket 26 is fixed to the inner tube fitting 24.

Thereafter, the vibration isolator 1 thus completed is completed.
2 is set in the vehicle, and a set screw 64 is passed through the leg portion 14 and fastened to the vehicle body 62, thereby fixing the outer cylindrical metal fitting 16 connected to the leg portion 14 to the vehicle body 62 as shown in FIGS. Then, the vibration isolator 10 can be mounted on the vehicle body 62. Further, a bolt (not shown) is fastened to a bolt hole of the arm bracket 26 to attach the arm bracket 26 to the engine.
Concatenate.

Next, the operation of the present embodiment will be described. The outer cylinder fitting 16 formed in a cylindrical shape is attached to the vehicle body 6 via the leg 14.
2 and the inner cylinder fitting 2 is provided on the inner peripheral side of the outer cylinder fitting 16.
4, one end of the arm bracket 26 is fixed to the end of the inner cylinder fitting 24, and the other end of the arm bracket 26 is connected to the engine. Further, the elastic body 18 disposed between the inner cylinder 24 and the outer cylinder 16 connects the inner cylinder 24 and the outer cylinder 16 to be elastically deformable.

Therefore, 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 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 high-frequency vibration is transmitted, the orifice 42, which can only reduce a narrow frequency range, is clogged and the vibration is not sufficiently reduced by the orifice 42 alone. Is not elastically deformed and the internal pressure in the liquid chamber 32 does not increase. As a result, even if 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 10 is sufficiently exhibited.

On the other hand, when excessive amplitude vibration is input from the engine and the inner cylinder 24 moves in the X direction shown in FIG. The relative movement of the fitting cylindrical portion 24 </ b> A with respect to the upper cylindrical metal member 20 is limited by the contact of the bound stopper rubber 60, which is located opposite to the cylindrical metal member 20, with the upper cylindrical metal member 20. Further, a convex portion 76 formed on the bound stopper rubber 60 is provided with a groove 7 formed on the outer peripheral surface of the fitting cylindrical portion 24A.
2 to seal the fitting portion between the bound stopper rubber 60 and the fitting cylindrical portion 24A, so that water, earth and sand, and oil accumulate on the elastic body 18 of the vibration isolator 10 or the like. Disappears.

As described above, the hole 74 is fitted into the fitting cylinder 24A while the projection 76 is engaged with the groove 72 of the fitting cylinder 24A.
This eliminates the need to attach the mounting plate to the stopper rubber 60 at the time of processing the bound stopper rubber 60.

Further, since there is no mounting plate, positioning between the mounting plate and the fitting tubular portion 24A, positioning between the mounting plate and the arm bracket 26, and rotation stop are not required. The rubber material hardly protrudes from the bound stopper rubber 60, and the finishing of the rubber material protruding from the bound stopper rubber 60 becomes unnecessary.

Accordingly, as a result, the workability and the assemblability can be improved and the manufacturing cost of the vibration isolator can be reduced.

Furthermore, in the present embodiment, the bound stopper rubber 60 is integrally formed of a rubber material while the convex portion 56 is formed in a ring shape. At this time, the inner diameter A1 of the hole portion 54 shown in FIG. Outer diameter B of fitting cylindrical portion 24A fitted with hole 54
1, the inner diameter A2 of the convex portion 56 is formed smaller than the outer diameter B2 of the bottom portion of the groove portion 52 that engages with the convex portion 56, so that an interference is provided.

Therefore, when these are fitted and engaged, the elasticity of the bound stopper rubber 60 causes the bound stopper rubber 60 and the fitting cylindrical portion 24A to be firmly fitted to each other. The gap is more reliably sealed, so that water, earth and sand, and oil do not accumulate on the elastic body 18 of the vibration isolator 10 or the like.

In the above embodiment, the arm bracket 26 and the inner cylinder 2
4 is connected to the vehicle body 62 as a vibration receiving portion.
Although the side is connected, the configuration may be reversed.

In the above embodiment, the inner cylinder 24 is connected to the engine via the arm bracket 26. However, the arm bracket 26 is removed and the inner cylinder 2 is removed.
4 and the engine may be directly connected.

On the other hand, in the embodiment, the purpose is to dampen an engine mounted on a vehicle. However, the anti-vibration device of the present invention is used for, for example, a body mount of a vehicle 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.

[0060]

As described above, the vibration isolator according to the present invention has an excellent effect that the workability and the assemblability can be improved and the manufacturing cost can be reduced as a result of the construction described above.

[Brief description of the drawings]

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

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

FIG. 3 is a plan view showing an embodiment of the vibration isolator according to the present invention, showing a state where an arm bracket is removed.

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

FIG. 5 is an enlarged cross-sectional view of an inner cylinder fitting and a bound stopper rubber of one embodiment of the vibration isolator according to the present invention.

FIG. 6 is a cross-sectional view showing a vibration isolator according to the related art.

FIG. 7 is a perspective view showing a stopper member applied to a vibration isolator according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator 16 Outer cylinder fitting (outer member) 18 Elastic body 20 Upper cylindrical fitting (outer member) 24 Inner cylinder fitting (inner member) 60 Bound stopper rubber (stopper material)

Claims (2)

[Claims] An outer member connected to one of the vibration generator and the vibration receiver and formed in a tubular shape; and an inner member located on the inner peripheral side of the outer member and connected to the other of the vibration generator and the vibration receiver. An inner member having a groove formed on an outer peripheral surface thereof; an elastic member disposed between the inner member and the outer member for elastically connecting the inner member and the outer member to each other; and a convex portion on the inner peripheral surface. A hole is formed, and the protrusion is engaged with the groove of the inner member, the hole is fitted to the inner member, and the outer member is positioned opposite to the outer member and abuts the outer member. And a stopper member capable of restricting relative movement of the inner member with respect to. 2. The stopper member is integrally formed of a rubber material while the convex portion is formed in a ring shape, and the inner diameter of the hole portion is made smaller than the outer diameter of a portion of the inner member fitted with the hole portion, and the convex portion is formed. 2. The vibration isolator according to claim 1, wherein an inner diameter of the portion is smaller than an outer diameter of a bottom portion of the groove portion engaging with the convex portion.