JPH04185924A - Vibration isolator - Google Patents

Abstract

PURPOSE:To improve durability of an elastic body to prevent a supporting member from becoming loose and rickety by providing an elastic body with a connecting member fixed to the supporting member to give tension to the elastic body at the time of movement of the supporting member. CONSTITUTION:An elastic body 14 is provided with a connecting member 28 fixed to a supporting member 36 and giving tension to the elastic body 14 at the time of movement of the supporting member 36. Therefor even if the elastic body 14 is vulcanized and stuck to the outer tube 13 to leave tensile stress in the elastic body 14, the elastic body 14 is moved by the connecting member 28 to offset the tensile stress of the elastic body 14 after vulcanization and adhesion, and compression stress is but in action. Therefore, generation of crack is prevented, and since an adhesion part is not always tensed, durability of a vibration isolator 10 is improved. Still more since the supporting member 36 is fixed to the connecting member 28, the supporting member 36 is surely supported on the elastic body 14, and it never happens to be loose or rickety.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bush-type vibration isolator that is installed between a vehicle and an engine and absorbs vibrations from the engine, etc.

[Prior art]

BACKGROUND OF THE INVENTION A bush type vibration isolator is used in vehicles and the like, in which a cylindrical support member covered with an elastic body and an outer cylinder are connected to a vibration generating part and a vibration receiving part, respectively.

This vibration isolator is mainly used in vehicle engine mounts, bushings, engine roll stoppers, center supports, etc., and has high damping to absorb high torque generated during engine startup or sudden acceleration. An elastic body with an effect is provided.

In a bush type vibration isolator, vibration isolating rubber is vulcanized and bonded to the outer peripheral surface of a cylindrical support member and the inner peripheral surface of an outer cylinder. When the rubber is vulcanized, tensile stress is generated inside the anti-vibration rubber due to rubber contraction. In this case, the adhesive strength of the vibration isolating rubber to the supporting member and the outer cylinder is weakened, and the vibration isolating rubber is more likely to crack, resulting in a problem that the durability of the vibration isolating device is deteriorated.

As a countermeasure against this problem, a method is generally used to reduce the tensile stress remaining inside the rubber by squeezing the outer cylinder after vulcanization.

By the way, in recent years, the structure of vibration isolators has become more complex.
There are some types that have an intermediate cylinder between the support member and the outer cylinder, but it is difficult to narrow down the complicatedly shaped intermediate cylinder. Further, if the outer cylinder has a flange or the like, the outer cylinder cannot be squeezed.

Therefore, as shown in FIG. 12(A), a frame body 106 whose diameter can be expanded is placed inside the outer cylinder 104 (or the intermediate cylinder in a vibration isolator equipped with an intermediate cylinder), and the outer cylinder 104 (or the intermediate cylinder is ) and the frame body 106, the cylindrical support member 102 is press-fitted into the frame body 106 as shown in FIG. 12(B), and the frame body 106 is attached to the outer cylinder 104 side. The elastic body 108 is expanded in diameter in the direction of arrow B.
A vibration isolating device 100 has been proposed that relieves the tensile stress in the six directions of the arrows in FIG.

However, since this vibration isolator 100 has a structure in which the inner cylinder 102 is simply press-fitted into the frame body 106,
There is a possibility that the support member 102 may become loose or shake.

[Problem to be solved by the invention]

In consideration of the above-mentioned facts, the present invention aims to provide a vibration isolator that can improve the durability of the elastic body and prevent the support member from becoming loose or wobbling.

[Means to solve the problem]

The present invention provides an outer cylinder connected to one of a vibration generating part or a vibration receiving part, a support member arranged inward of the outer cylinder and connected to the other of the vibration generating part or the vibration receiving part, and the outer cylinder. and an elastic body connecting the supporting member, the elastic body having a connecting member fixed to the supporting member and applying tension to the elastic body when the supporting member moves. It is characterized by

[Effect]

In the present invention having the above configuration, the elastic body is provided with a connecting member that is fixed to the support member and applies tension to the elastic body when the support member moves. Therefore, even if the elastic body is vulcanized and bonded to the outer cylinder and tensile stress remains in the elastic body, the connecting member moves the elastic body to offset the tensile stress of the elastic body after vulcanization bonding and reduce the compressive stress. It can be made to work. In addition, the occurrence of about one crack is prevented, and the adhesive portion is not constantly stretched, so that the durability of the vibration isolator can be improved. Furthermore, since the supporting member is fixed to the connecting member, the supporting member is reliably supported by the elastic body and will not loosen or wobble.

[First Embodiment] FIGS. 1 to 4 show a first embodiment of a vibration isolating device 10 according to the present invention.
An example is shown.

As shown in FIGS. 1 and 3, this vibration isolator 10 has an elastic body 14 inside an intermediate cylinder 12 on both upper and lower sides (in the directions of arrows A and B in FIGS. 1 and 3) with the axis sandwiched therebetween. A pair of intermediate cylinders 12 are arranged inside the outer cylinder 13.

The elastic body 14 includes a pair of substantially fan-shaped side wall portions 18 disposed inward near both ends of the intermediate cylinder 12, and these pair of side wall portions 1.
8 and a pair of inner wall portions 16 connecting both ends thereof along the radial direction. In the elastic body 14, a pocket portion 22 is formed by the inner wall portion 16 and the side wall portion 18, and the opening edge of the pocket portion 22 is vulcanized and bonded to the inner peripheral surface of the intermediate cylinder 12. This intermediate cylinder 12 has a pair of openings 1 corresponding to the pocket portions 22 on the opposite side across the axis.
2A is formed. The intermediate tube 12 is press-fitted into the cylindrical body 13, and both ends of the outer tube 13 are drawn inward, thereby fixing the intermediate tube 12 to the outer tube 13. Further, a protrusion 26 is formed on the pocket portion 22 side of the elastic body 14 so as to protrude outward in the radial direction of the intermediate cylinder 12, and the elastic body 14 extends in the direction in which the protrusion 26 protrudes (see FIGS. 1 and 3).
Limits the amplitude when vibrating in the directions of arrows A and B in the figure).

Further, each of these elastic bodies 14 is provided with expansion fittings 28 as connecting fittings at the end on the axis side of the vibration isolator 10, and between these expansion fittings 28 is an inner part serving as a support part. A tube 36 is arranged. As shown in FIG. 1, a pair of grooves 38 are formed in the longitudinal direction intermediate portions of the inner cylinder 36 on both left and right sides (in the direction of arrows E and F in FIG. 1) in the direction along the axis.

As shown in FIG. 2, the expansion fitting 28 is made of a steel plate and consists of a fixing part 30 and a holding part 32.

The fixed portion 30 has a substantially T-shaped cross section perpendicular to the axis.
As shown in FIG. 3, the end portion 30A is disposed on the narrow side and embedded within the protrusion 26. A holding portion 32 is fixed to an end portion 30A of this fixed portion 30. The holding portion 32 is formed in a substantially semicircular arc shape corresponding to the outer circumferential surface of the inner cylinder 36, and both ends in the width direction (directions of arrows E and F in FIGS. 1 and 2) are bent toward the axis. This forms a pair of claw portions 34. These claws 34 are respectively fitted into grooves 38 of the inner cylinder 36, thereby preventing the inner cylinder 36 from rotating around the axis and moving in the axial direction with respect to the elastic body 14. Further, the respective elastic bodies 14 are connected to each other via the expansion fitting 28 and the inner cylinder 36.

Next, the manufacturing process of the vibration isolator 10 of the example will be explained.

First, a pair of elastic bodies 14 are arranged inside the intermediate cylinder 12 so that the expansion fittings 28 face each other, and the opening edges of these elastic bodies 14 are made to correspond to the opening 12A, and vulcanization is applied to the inner peripheral surface of the intermediate cylinder 12. Glue. Here, the elastic body 14 is in a radial direction (direction toward the inner circumferential surface of the intermediate cylinder 12) due to rubber contraction due to vulcanization.
Tensile stress remains inside the elastic body 14, which is fixed under tension. In addition, in the elastic body 14 in a free state after vulcanization and adhesion, the distance between the inner circumferential surfaces on the fine side of each holding part 32 (dimension G in FIGS. 1 and 4) is equal to the outer diameter dimension of the inner cylinder 36 (dimension G in FIGS. It is smaller than the dimension H) in Figure 1.

Next, the pair of expansion fittings 28 are moved in the direction of separating them from each other (in the directions of arrows A and B), and the inner cylinder 36 is placed between the pair of expansion fittings 28 so as to correspond to the outer peripheral surface of the inner cylinder 36. Then, the holding portion 32 of the expansion fitting 28 is bent, and the claw portion 34 of the expansion fitting 28 is fitted into the groove 38 of the inner cylinder 36. by this,
The inner cylinder 36 is supported by the elastic body 14 via the expansion fitting 28, and the elastic body 14 is pressed in a substantially radial direction (direction toward the inner peripheral surface of the intermediate cylinder 12). Therefore, the tensile stress of the elastic body 14, which remains stretched in the direction toward the inner peripheral surface of the intermediate cylinder 12 after vulcanization and adhesion, is canceled out, and a compressive force is further applied, so that cracks do not occur in the elastic body 14. This is less likely to occur, and the durability of the vibration isolator 10 is improved.

Moreover, since the claw portion 34 of the expansion fitting 28 is fitted into the groove 38 of the inner cylinder 36, the inner cylinder 36 is securely fixed to the elastic body 14.

Next, the operation of this embodiment will be explained.

When the outer cylinder 13 is attached to a vehicle body (not shown) and the inner cylinder 36 is connected to an engine (not shown), engine vibrations are transmitted to the inner cylinder 3.
6 to the elastic body 14.

At this time, engine vibrations are absorbed by internal frictional resistance due to expansion and contraction of the elastic body 14, and vibrations transmitted to the vehicle body are attenuated.

Also, arrows A and B in FIG. 1 between the intermediate cylinder 12 and the inner cylinder 36
If the relative movement in the direction becomes extremely large, the protrusion 2
6 comes into contact with the inner circumferential surface of the outer cylinder 13 and the amount of deflection is limited, so that no large tensile force is applied to the elastic body 14, thereby preventing cracking and peeling of the bonded portion.

[Second Embodiment] FIG. 5 shows a second embodiment of the vibration isolating device 1o according to the present invention. Note that parts common to those in the first embodiment are given the same numbers, and a description of this configuration will be omitted.

In the second embodiment, a cylindrical body 40 is disposed outside the outer cylinder 13 and coaxially with the outer cylinder 13. Both axial ends of the outer cylinder 13 and both axial ends of the cylindrical body 4o are connected and sealed by a sealing member (not shown), and an annular passage 42 is formed between the outer cylinder 13 and the cylindrical body 4o. . Further, holes 44 are formed in the outer cylinder 13 at positions corresponding to the pocket portions 22 of the elastic body 14, and the pocket portions 22 and the annular passage 42 are filled with a liquid 46 such as silicone oil.

In this vibration isolator 10, each elastic body 14 is connected via the expansion fitting 28 and the inner cylinder 36, so that the inner cylinder 36 is connected to the outer cylinder 13 in the vertical direction (arrows A and B in FIG. 5). direction), the negative elastic body 14 receives a compressive force, and the other elastic body 14 receives a tensile force. Therefore, the pressure acting on the liquid 46 filled in the pocket portion 22 of one elastic body 14 is positive, and the pressure acting on the liquid 46 filled in the pocket portion 22 of the other elastic body 14 is negative. Therefore, the flow of the liquid 46 in the annular passage 42 is good.

[Third Embodiment] FIGS. 6 to 9 show a third embodiment of the vibration isolating device 10 according to the present invention.
An example is shown. Note that parts common to those in the first embodiment are given the same numbers, and a description of this configuration will be omitted.

As shown in FIG. 6, in the third embodiment, a pair of elastic bodies 1
4, a pair of expansion fittings 48 are provided in place of the pair of expansion fittings 280 shown in the first embodiment. As shown in FIG. 7, this expansion fitting 48 has a holding portion 50 and a fixing portion
It is composed of 2. The holding part 50 is formed of a rod-shaped member having a semicircular cross section perpendicular to the axis, and is arranged with the flat part 50A facing the axis. On the other hand, the fixed portion 52 is attached to the protrusion 26
embedded inside. The fixed portion 52 is made of a steel plate having a U-shaped cross section perpendicular to the axis, and both ends 52
A is fixed to the arc portion 50B of the holding portion 50.

Support washers 54 as support parts are attached to both ends of the expansion fitting 48 in the longitudinal direction (directions of arrows C and D in FIG. 6). The support washer 54 is formed of a disc-shaped copper plate, and has a mounting hole 56 bored in the center thereof into which a bolt (not shown) is inserted. Furthermore, a pair of semilunar holes 58 corresponding to the holding portions 50 are bored on both sides of the mounting hole 56 in the vertical direction (directions of arrows A and B in FIG. 6), and the upper half (on the outward side of the arrows in FIG. The holding portion 50 of the elastic body 14 on the upper side (in the direction of arrow B in FIG. 6) is fitted into the lower half (in the direction of arrow B in FIG. 6). The holding portion 50 of the elastic body 14 on the side (direction side) is fitted. Therefore, these elastic bodies 14 are connected to the pair of expansion fittings 48.
and are connected via a pair of support washers 54.

An elastic body 1 in a free state vulcanized and bonded to the inner periphery of the intermediate cylinder 12
4, the interval between the flat parts 50A of each holding part 50 (dimension J in Figure 6) is smaller than the interval between the straight parts 58A of the semilunar hole 58 of the support washer 54 (dimension I in Figure 6) . Therefore, when the support washer 54 is attached to the holding part 50, the elastic body 14 is pressed toward the inner circumferential surface of the intermediate tube 12 by the support washer 54, and the elastic body 14 is pressed in the direction toward the inner circumferential surface of the intermediate tube 12 by vulcanization. The tensile stress of the elastic body 14, which has remained in a stretched state, is canceled out and a compressive force is further applied, so that cracks are less likely to occur in the elastic body 14, and the durability of the vibration isolator is improved.

[Fourth Embodiment] FIG. 10 shows a fourth embodiment of the vibration isolator 10 according to the present invention. Note that parts common to the first embodiment and the second embodiment are designated by the same reference numerals, and a description of this configuration will be omitted.

In this embodiment, a cylindrical body 40 is provided outside the outer cylinder 13 of the third embodiment.
are arranged, and both ends of the outer tube 13 and both ends of the cylindrical body 400 are hermetically connected by a sealing member (not shown). Similarly to the vibration isolator 10 of the second embodiment, the vibration isolator 10 of the fourth embodiment also has an elastic body 1 on the upper side (outward side of the arrow in FIG. 10).
4 and the lower elastic body 14 (on the side in the direction of arrow B in FIG. 10) are connected via the holding part 50 and the support washer 54, so that the liquid 46 in the annular passage 42 flows easily.

[Fifth Embodiment] FIGS. 11(A) and 11(B) show a fifth embodiment of the vibration isolating device 10 according to the present invention.

Note that parts common to those in the first embodiment are given the same numbers, and a description of this configuration will be omitted.

In the fifth embodiment, there is no intermediate cylinder 12, the elastic body 14 is directly vulcanized and bonded to the inner peripheral surface of the outer cylinder 13, and a frame body 60 is arranged at the center of the elastic body 14 as a connecting member. ing. As shown in FIG. 11(A), the frame body 60 before inserting the inner cylinder 36 is a hollow square prism with an upper surface 60A.
And the lower surface 60B is bent at the middle part. Also,
The left side surface 60C and the right side surface 60D of the frame body 60 are formed into a flat plate shape, and a protrusion 62 corresponding to the groove 38 of the groove A36 is formed on the inner side. Furthermore, the left side 6G
The distance between C and the right side surface 60D is smaller than the outer diameter H of the inner cylinder 36. Inner peripheral surface of outer cylinder 13 and frame body 60
An elastic body 14 is provided between the left side surface 60C and the right side surface 60D.
The hooks have been passed and vulcanized and glued. Therefore, tensile stress remains in the elastic body 14 in the direction of arrow M in FIG. 11(A) due to rubber contraction after vulcanization and adhesion.

When the inner cylinder 36 is inserted into the frame body 60, as shown in FIG.
), a force in the direction of arrow N in FIG. 11(B) is applied to the elastic body 14, so that the elastic body 14 is pressed in the opposite direction. As a result, the tensile stress acting on the elastic body 14 is canceled out, so that cracks do not occur in the elastic body 14, and the durability of the vibration isolator 10 can be improved. Furthermore, the protrusion 6 of the frame body 60 is inserted into the groove 38 of the inner cylinder 36.
2 fits in, the inner cylinder 36 is securely fixed to the elastic body 14 and will not come out from the vibration isolator 10.

〔Effect of the invention〕

As explained above, the vibration isolator according to the present invention has an excellent effect that the durability of the vibration isolator rubber is improved and that the support member does not loosen or wobble.

[Brief explanation of drawings]

1 to 4 show a first embodiment of the vibration isolator according to the present invention, FIG. 1 is an exploded perspective view of the vibration isolator, and FIG.
The figure is a perspective view of the support fitting, Figure 3 is an axial cross-sectional view of the vibration isolator, Figure 4 is an axial cross-sectional view of the vibration isolator with no inner cylinder inserted, and Figure 5 is a cross-sectional view of the vibration isolator at right angles to the axis. 6 to 9 are axial cross-sectional views showing a vibration isolator according to a second embodiment of the invention, and FIGS. 6 to 9 show a vibration isolator according to a third embodiment of the invention, and FIG. FIG. 7 is an exploded perspective view of the vibration isolator, FIG. 7 is a perspective view showing the support fittings, FIG. 8 is an axial cross-sectional view showing the vibration isolator with no support washer attached, and FIG. FIG. 10 is a cross-sectional view at right angles to the axial direction showing the attached vibration isolator, FIG.
) is an axially right-angled sectional view showing a vibration isolator according to a fifth embodiment of the present invention, and FIGS. 12(A) and 12(B) are axially right-angled sectional views showing a conventional vibration isolator. . DESCRIPTION OF SYMBOLS 10... Vibration isolator, 13... Outer cylinder, 14... Elastic body, 28... Expansion fitting (connection member), 36... Inner cylinder (support member), 48... Expansion Opening tool (connection member), 54... Support washer (support member), 60-... Frame body (connection member).

Claims (1)

[Claims] (1) An outer cylinder connected to one of the vibration generating part or the vibration receiving part, a support member disposed inside the outer cylinder and connected to the other of the vibration generating part or the vibration receiving part, and the outer cylinder. A vibration isolator comprising an elastic body that connects to the support member, wherein the elastic body is provided with a connection member that is fixed to the support member and applies tension to the elastic body when the support member moves. A vibration isolator featuring: