JPH11125289A - Cylindrical vibration isolating device equipped with side stopper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively restrict the rotation of a side stopper relative to an inner cylinder. SOLUTION: A side stopper installed at the end in axial direction of an inner cylinder 2 is provided with a fit hole 24 having such an inside surface shape as mating with the peripheral surface shape of the end in axial direction of the inner cylinder 2 and to be fitted on this end part and a fit recess 25 formed at the periphery of the fit hole 24 and having such an inner surface shape as mating with the peripheral surface shape of an internal stopper 5 so as to be fitted on it 5. The engagement of the internal stopper 5 having a forefront contacting part protruding outward in the radial direction with the fit recess 25 in the side stopper 6 is made so that the engaging force resisting against the relative rotation increases with increasing inertial moment and increasing contacting area. Therefore, the relative rotation of the side stopper 6 with the inner cylinder 2 can be restricted effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical vibration isolator having a side stopper used as, for example, an engine mount or a cab mount of an automobile.

[0002]

2. Description of the Related Art Conventionally, a cylindrical vibration isolator with a side stopper has been used as an engine mount of an automobile or the like.
As shown in FIGS. 12 and 13, the vibration isolator is disposed radially inside the outer cylinder 80 which is fitted and fixed to a first mounting member (not shown). Both ends in the axial direction protruding outward in the axial direction from the both ends are interposed between the inner cylinder 81 fixed to the second mounting member 90 and the outer cylinder 80 and the inner cylinder 81 to connect the two. Rubber elastic body 82 having a hollow portion 82a penetrating in the direction
An internal stopper 83 disposed in the hollow portion 82a and having a distal end contact portion 83a protruding outward in the radial direction to restrict relative displacement between the outer cylinder 80 and the inner cylinder 81 in the radial direction;
The inner cylinder 81 is attached to both ends in the axial direction. At least a part of the inner cylinder 81 extends radially outward from the outer cylinder 80 so that both ends in the axial direction of the outer cylinder 80 can contact each other. A pair of rubber side stoppers 84, 84 having a contact portion 84a and restricting relative displacement between the outer cylinder 80 and the second mounting member 90 in the axial direction are provided.

Here, on the outer peripheral surfaces of both ends in the axial direction of the inner cylinder 81, a detent protrusion 82b is formed integrally with the rubber elastic body 82 at a part in the circumferential direction (the upper part in FIGS. 12 and 13). It is provided in. On the other hand, in the side stopper 84, a circular hole having an inner diameter substantially equal to the outer diameter of the inner cylinder 81 is provided with a concave groove 84b corresponding to the detent projection 82b, and the inner cylinder 81 including the detent projection 82b is provided. Hole 84c having an inner peripheral surface shape corresponding to the outer peripheral surface shape at the axial end portion
have. Then, the groove 8b is prevented from rotating and the protrusion 8 is formed.
The side stopper 84 is attached to the axial end of the inner cylinder 81 by fitting the fitting hole 84c to the axial end of the inner cylinder 81 while positioning in the circumferential direction with respect to 2b. Further, the opposing inner surface 9 of the second mounting member 90 mounted to the axial end of the inner cylinder 81 via bolts, nuts and the like.
Reference numerals 0a and 90a are in contact with the outer end surfaces of the side stoppers 84, respectively.

When the vibration isolator is mounted on an automobile, the side stopper 84 is rotated by the relative displacement between the second mounting member 90 mounted on the inner cylinder 81 and the outer cylinder 80. In order to make the side stopper 84 exist at a position where the end portion in the direction and the second mounting member 90 are likely to come into contact with each other, a part of the circumferential direction partially bulges outward in the radial direction so that the outer cylinder 80
And extends radially outward.

In the cylindrical vibration isolator with the side stopper having such a structure, for example, when a radial vibration acts between the outer cylinder 80 and the inner cylinder 81, the rubber elastic body 82 elastically acts. Vibration is effectively damped. When excessive radial vibration acts between the outer cylinder 80 and the inner cylinder 81, the distal end contact portion 83 a of the inner stopper 83 is moved to the outer cylinder 8.
By restricting the relative displacement between the outer cylinder 80 and the inner cylinder 81 by a predetermined amount or more by, for example, contacting the inner peripheral surface of the rubber elastic body 82, excessive deformation of the rubber elastic body 82 is prevented, and the durability of the rubber elastic body 82 is reduced. Is being improved. Also, the outer cylinder 80 and the inner cylinder 8
When excessive axial vibration acts between the outer cylinder 80 and the outer cylinder 80, the inner end surface abutting portion 84a of the side stopper 84 abuts on the axial end of the outer cylinder 80. The contact with the second attachment member 90 attached to the cylinder 81 can be avoided. Thus, for example, when the outer cylinder 80 and the second mounting member 90 are made of metal, it is possible to suppress damage to the outer cylinder 80 and the like and noise generation due to contact between the metals.

[0006]

However, in the conventional vibration isolator having the above structure, the second mounting member 90 is attached to the inner cylinder 81.
The fastening force of bolts and nuts fixed to
When the relative rotation occurs between the inner cylinder 81 and the second mounting member 90, the side stopper 84 may rotate around the inner cylinder 81, so that the side stopper 84 may not be able to perform its original function. there were.

That is, the rotation of the side stopper 84 with respect to the inner cylinder 81 is controlled by the rotation preventing projection 82b and the fitting hole 84c.
Of the inner cylinder 81 and the rotation stopper projection 82b and the contact surface between the side stopper 84 and the restraining force based on friction. However, relative rotation occurs between the inner cylinder 81 and the second mounting member 90, and the rotation force exceeding the above-described restraining force is applied to the side stopper 84 that is in contact with the second mounting member 90 with a large area by surface pressure. In this case, the engagement between the rotation preventing protrusion 82b and the concave groove 84b is released, and the side stopper 84 rotates with respect to the inner cylinder 81. As a result, the partially bulged portion of the side stopper 84 is displaced in the circumferential direction from a position where the side stopper 84 should be, and the side stopper 84 cannot perform its original function.

As a measure against the circumferential displacement of the side stopper 84, the thickness of the side stopper 84 is increased, and the length of the detent protrusion 82b (the axial length of the inner cylinder 81) is increased. Means for increasing the deterrent by increasing the contact area between the side stopper 84 and the inner cylinder 81 and the rotation preventing projection 82b may be considered. However, according to this means, the detent projection 8
The rubber volume in the rubber elastic body 82 is restricted by the length of the length 2b (by the thickness of the side stopper 84). This is disadvantageous in terms of the elastic characteristics and durability of the rubber elastic body 82.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and does not reduce the elasticity and durability of a rubber elastic body that integrally connects an outer cylinder and an inner cylinder, without reducing the side stopper for the inner cylinder. It is a technical problem to be solved to provide a cylindrical vibration isolator with a side stopper capable of effectively restricting rotation.

[0010]

A cylindrical vibration isolator with a side stopper according to the present invention for solving the above problems is provided with an outer cylinder fixed to a first mounting member and a radially inner side of the outer cylinder. An inner cylinder in which both ends in the axial direction projecting outward in the axial direction from both ends in the axial direction of the outer cylinder are fixed to the second mounting member, and both are interposed between the outer cylinder and the inner cylinder to form the two. A substantially cylindrical rubber elastic body having a hollow portion connected to and axially penetrating therethrough; and a radially outer cylinder having a tip abutting portion disposed in the hollow portion and protruding radially outward. And an inner stopper that regulates relative displacement between the inner cylinder and the inner cylinder. At least a part of the inner cylinder extends radially outward from the outer cylinder and is attached to both ends in the axial direction of the inner cylinder. An inner end surface contact portion at which both ends in the axial direction of the tube can contact each other, and the outer tube and the second mounting member And a pair of side stoppers for restricting relative displacement in the axial direction of the inner cylinder, wherein at least one of the side stoppers has an outer periphery at an axial end of the inner cylinder. A fitting hole having an inner peripheral surface shape corresponding to the surface shape and fitted to the axial end, and an inner periphery formed around the fitting hole and corresponding to the outer peripheral surface shape of the internal stopper; A fitting recess having a surface shape and fitted to the internal stopper.

The side stopper of the cylindrical vibration isolator with the side stopper has a fitting hole fitted to an axial end of the inner cylinder, and a fitting recess formed around the fitting hole. By being fitted to the stopper, it is attached to the axial end of the inner cylinder. Then, the relative rotation of the side stopper with respect to the inner cylinder is restricted by the engagement between the inner stopper and the fitting concave portion and the deterrent force based on the friction on the contact surface between the inner cylinder and the inner stopper and the side stopper.

The internal stopper is provided for restricting a relative displacement of the outer cylinder and the inner cylinder in a radial direction by a predetermined value or more. The inner stopper is disposed in a hollow portion of the rubber elastic body so as to extend radially outward. It has a protruding tip contact portion. That is, the distal end contact portion of the internal stopper protrudes considerably outward in the radial direction from the outer peripheral surface of the inner cylinder in order to regulate the relative displacement of the outer cylinder and the inner cylinder in the radial direction by a predetermined value or more.

[0013] The engagement between the internal stopper having the tip abutting portion projecting outward in the radial direction and the fitting recess of the side stopper prevents the relative rotation based on the increase in the moment of inertia and the contact area. The engagement force has increased. Therefore, the relative rotation of the side stopper with respect to the inner cylinder can be effectively restricted. In a preferred aspect, the internal stopper includes a stopper main body fixed to the inner cylinder, and an auxiliary stopper detachably attached to the stopper main body.

In this embodiment, the fitting recess of the side stopper is fitted to the auxiliary stopper attached to the stopper body. Therefore, the inertia moment and the contact area can be increased by the amount of the auxiliary stopper, and the relative rotation of the side stopper in the inner cylinder can be more effectively restricted.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view along the axial direction of the liquid-filled cylindrical vibration damping device with a side stopper according to the present embodiment, and is a cross-sectional view taken along line BB of FIG. 3, and FIG. FIG. 3 is a cross-sectional view taken along line AA of FIG. 1 along a direction perpendicular to the axis of the vibration isolator, and FIG. 3 is a side view from the axial direction (left side in FIG. 1) of the cylindrical vibration isolator. is there.

The cylindrical vibration isolator of the present embodiment comprises an outer cylinder 1,
An inner cylinder 2 disposed radially inward of the outer cylinder 1 and having both ends in the axial direction projecting outward in the axial direction from both ends in the axial direction of the outer cylinder 1, interposed between the outer cylinder 1 and the inner cylinder 2; A rubber elastic body 4 having a substantially cylindrical shape having a cavity 3 penetrating in the axial direction, and a relative displacement between the outer cylinder 1 and the inner cylinder 2 disposed in the cavity 3 in the radial direction. Internal stopper 5 that regulates
And a pair of rubber side stoppers 6 and 7 respectively attached to both ends of the inner cylinder 2 in the axial direction.

The outer cylinder 1 is formed of metal in a cylindrical shape, and is attached by being inserted outside the rubber elastic body 4 to reduce the diameter. Thereby, a main liquid chamber 13, a sub liquid chamber 14, and an orifice passage 15 of the rubber elastic body 4 described later.
Are liquid-tightly closed. The inner cylinder 2 is formed in a pipe shape from metal. Inside the rubber elastic body 4, an intermediate metal fitting 8 which is arranged concentrically with the rubber elastic body 4 and the outer cylinder 1 is partially embedded. The intermediate fitting 8 includes a pair of ring portions 9, 9 coaxially spaced apart in the axial direction, and two bridge portions 10, 10 bridged between the ring portions 9, 9. Two windows are formed between the bridging portions 10 and 10 together with the pair of ring portions 9 and 9. The intermediate fitting 8 and the inner cylinder 2 are integrally connected by a rubber elastic body 4 which is vulcanized and formed together therewith.

The rubber elastic body 4 is formed in a substantially cylindrical shape, and has a pair of side walls 11, 11 located at both ends.
The two side wall portions 1 are extended in the axial direction between the two side wall portions 11 and 11.
A pair of arm-shaped partition walls 12, 12 for dividing the space between 1, 11 into two
And As a result, the portions corresponding to the windows of the intermediate metal fittings 8 on both sides in the radial direction with the inner cylinder 2 interposed therebetween are shown in FIG.
The main liquid chamber 13 is located on the upper side of FIG.
Are formed. The main liquid chamber 13 and the sub liquid chamber 14 are communicated with each other by an orifice passage 15 formed on the outer peripheral portion of the rubber elastic body 4, and an incompressible liquid L is sealed therein. In addition, as the incompressible liquid L, for example, water, glycol, or the like can be used.

Further, the inner cylinder 2 of the rubber elastic body 4 and the sub liquid chamber 1
4 is formed in the portion between the cavity 3 and the auxiliary liquid chamber 14, and a part of the rubber elastic body 4 is thinned between the cavity 3 and the auxiliary liquid chamber 14. Thus, a diaphragm 16 constituting a partition of the sub liquid chamber 14 is formed. Further, on the outer peripheral surfaces of both ends in the axial direction of the inner cylinder 2, positioning projections 17, 17 are provided integrally with the rubber elastic body 4 in a part of the circumferential direction (the upper part in FIGS. 1 and 3). .

The internal stopper 5 provided in the hollow portion 3 is radially outward from the cylindrical portion 18a fixed to the outer peripheral surface of the inner cylinder 2 toward the auxiliary liquid chamber 14 (see FIGS. 1 and 2). The stopper body 18 is formed integrally with the cylindrical portion 18a so as to project downward (downward), and an auxiliary stopper 19 detachably attached to a protruding tip of the stopper body 18.

The stopper main body 18 is integrally formed with a liquid chamber stopper 20 projecting radially outward from the cylindrical portion 18a to near the center of the main liquid chamber 13.
The stopper main body 18 and the liquid chamber stopper 20 restrict relative displacement of the outer cylinder 1 and the inner cylinder 2 in the radial direction by a predetermined amount or more, and are integrally formed of resin. The stopper body 18 and the liquid chamber stopper 20 are made of rubber elastic body 4.
The protruding portions of the stopper main body 18 and the liquid chamber stopper 20 are covered with a cushion rubber layer of the rubber elastic body 4.

As shown in FIGS. 6 to 9, the auxiliary stopper 19 comprises a metal plate 21 having a substantially L-shaped cross section, and a rubber member 22 formed integrally with the metal plate 21 by vulcanization. And has a vertical portion 19a and a horizontal portion 19b. The vertical portion 19a of the auxiliary stopper 19 has an inner cylinder 2
A concave groove 23b corresponding to the positioning protrusion 17 is provided in a circular hole 23a having an inner diameter substantially equal to the outer diameter of the inner cylinder 2 so as to correspond to the outer peripheral surface shape at the axial end of the inner cylinder 2 including the positioning protrusion 17. A fitting hole 23 having an inner peripheral surface shape is formed. The rubber member 22 located at the horizontal portion 19b of the auxiliary stopper 19 is formed with a substantially U-shaped rubber portion 22a which is engaged with and held by the protruding tip of the stopper main body 18. Then, the concave groove 23b is aligned with the positioning protrusion 17.
The fitting hole 23 is positioned in the circumferential direction with respect to the inner cylinder 2.
Of the stopper body 18 by engaging the substantially U-shaped rubber portion 22a with the protruding tip end of the stopper body 18 and fitting it to the axial end (the left end in FIG. 1).
The auxiliary stopper 19 is detachably attached to the protruding distal end of the stopper body 18 while compressing the buffer rubber layer of the rubber elastic body 4 formed on the protruding distal end surface with the metal plate 21 provided on the horizontal portion 19 b of the auxiliary stopper 19. Have been.

Auxiliary stopper 1 thus mounted
Reference numeral 9 denotes engagement between the positioning projection 17 and the concave groove 23b, engagement between the projecting tip of the stopper main body 18 and the substantially U-shaped rubber portion 22a, and friction on the contact surface between the stopper main body 18 and the auxiliary stopper 19. , The relative rotation with respect to the stopper main body 18 is reliably restricted.
In particular, in the present embodiment, the rigidity of the auxiliary stopper 19 is enhanced by the metal plate 21, and the horizontal portion 19 b of the highly rigid auxiliary stopper 19 compresses the projecting distal end surface of the stopper main body 18, and Since the protruding tip and the substantially U-shaped rubber portion 22a of the auxiliary stopper 19 are securely engaged, the relative rotation of the auxiliary stopper 19 with respect to the stopper main body 18 can be more reliably restricted. The substantially U-shaped rubber portion 22a located on the horizontal portion of the auxiliary stopper 19 constitutes the leading end contact portion of the present invention. The distal end contact portion of the auxiliary stopper 19 formed by the substantially U-shaped rubber portion 22a protrudes largely outward in the radial direction from the outer peripheral surface of the inner cylinder 2. Specifically, a region from the center of the outer cylinder 1 to a half or less of the diameter of the outer cylinder 1 is defined as a central area of the outer cylinder 1,
When a region equal to or more than 直径 of the diameter of the outer cylinder 1 is set as the outer peripheral region of the outer cylinder 1, the distal end contact portion projects radially outward so as to reach at least the outer peripheral region of the outer cylinder 1.

Here, the auxiliary stopper 19 is attached to the inner cylinder 2
Is in the radial direction on the side of the auxiliary liquid chamber 14 with respect to the
(Downward) is regulated relatively large displacement,
This is for improving the durability of the rubber elastic body 4, particularly at the side walls 11, 11. That is, the anti-vibration device of the present embodiment is compared with the state shown in FIG. 1 and FIG.
The inner cylinder 2 is mounted on an automobile in a state of being displaced relative to the outer cylinder 1 in the radial direction on the main liquid chamber 13 side (upward in FIGS. 1 and 2). Therefore, when mounted on a car,
The distance between the projecting tip of the stopper body 18 and the diaphragm 16 is larger than that shown in FIGS.
The inner cylinder 2 is allowed to be relatively displaced in the radial direction on the side of the auxiliary liquid chamber 14 with respect to the outer cylinder 1. The radial displacement of the inner cylinder 2 with respect to the outer cylinder 1 on the side of the auxiliary liquid chamber 14 causes a tensile stress to act on both side walls 11, 11 of the rubber elastic body 4. Therefore, when the inner cylinder 2 is relatively displaced in the radial direction on the side of the auxiliary liquid chamber 14 with respect to the outer cylinder 1, the side walls 11, 1 and 2 of the rubber elastic body 4 are moved.
1 is disadvantageous in securing durability. Therefore, by attaching an auxiliary stopper 19 to the protruding tip portion of the stopper body 18, in a vibration isolator mounted on an automobile,
The metal plate 20 of the auxiliary stopper 19 and the substantially U-shaped rubber portion 21a
The distance between the distal end of the stopper body 18 and the diaphragm 16 is reduced by the thickness of the inner cylinder 2 by the thickness of the inner cylinder 2.
Restricts large relative displacement in the radial direction on the side of the sub-liquid chamber 14 with respect to the outer cylinder 1.
The durability of 1 and 11 is improved.

Further, only one of the pair of side stoppers 6 and 7 has a relative position with respect to the inner cylinder 2 due to the influence of the posture of the vibration isolator mounted on the vehicle or the vibration during running of the vehicle. In some cases, it is likely to be displaced in the circumferential direction due to the rotation, and the problem of displacement in the circumferential direction may not occur for the other side stopper. Therefore, in the present embodiment, the present invention is applied only to one rubber side stopper 6 attached to one end of the inner cylinder 2 in the axial direction (the left side in FIG. 1; the same applies hereinafter). That is, the side stopper 6
As shown in FIGS. 10 and 11, a fitting hole 24 having the same shape as the fitting hole 23 of the auxiliary stopper 19 is formed. Specifically, the fitting hole 24 is
A circular hole 24a having an inner peripheral surface shape corresponding to the outer peripheral surface shape at the axial end portion of the inner cylinder 2 including the inner cylinder 2 and having an inner diameter substantially equal to the outer diameter of the inner cylinder 2 has a recess corresponding to the positioning projection 17. The groove 24b is provided. Around the fitting hole 24, the auxiliary stopper 1 constituting the internal stopper 5 is provided.
9 has an inner peripheral surface shape corresponding to the outer peripheral surface shape including the vertical portion 19a, and is fitted into the auxiliary stopper 19.
5 are formed. Then, while positioning the concave groove 24b in the circumferential direction with respect to the positioning projection 17, the fitting hole 24b is formed.
Is fitted to the axial end of the inner cylinder 2 (the left end in FIG. 1) and the fitting recess 25 is fitted to the auxiliary stopper 19 so that the left side stopper 6 It is attached to the end on one side in the direction.

On the other hand, the rubber side stopper 7 attached to the other end of the inner cylinder 2 in the axial direction (the right side in FIG. 1; the same applies hereinafter) is fitted to the fitting hole 23 of the auxiliary stopper 19 and the Only a fitting hole 26 having the same shape as the fitting hole 24 of the left side stopper 6 is formed. The right side stopper 7 is attached to the other axial end of the inner cylinder 2 by directly fitting the fitting hole 26 to the axial end of the inner cylinder 2 including the positioning projection 17. ing.

The right side stopper 7 also has an outer periphery of the stopper body 18 (including the cushioning rubber layer formed on the outer peripheral surface of the stopper body 18) around the fitting hole 26. Of course, it is also possible to form a fitting recess having an inner peripheral surface shape corresponding to the surface shape. Further, the side stoppers 6 and 7 move in the axial direction of the outer cylinder 1 by the relative displacement between the second mounting member T attached to the inner cylinder 2 and the outer cylinder 1 in a state where the vibration isolator is mounted on the automobile. In order to make the side stoppers 6 and 7 exist at the positions where the end and the second mounting member T are easily in contact with each other, a part in the circumferential direction partially bulges outward in the radial direction, and It has a substantially fan shape extending outward. The inner end faces 6a, 7a of the side stoppers 6, 7 on the outer cylinder 1 side constitute the inner end face contact portion of the present invention.

The cylinder type vibration damping device with side stoppers of the liquid filling type of this embodiment is manufactured as follows. First, the inner cylinder 2 is formed in a predetermined shape, and the outer peripheral surface of the inner cylinder 2 is knurled so that the cylindrical portion 18a of the stopper body 18 is securely fixed. Next, the inner cylinder 2 is disposed at a predetermined position in a molding die in which the stopper main body 18 and the liquid chamber stopper 20 are integrally formed, and resin molding is performed. The molded body is formed while being fixed to the outer periphery of the inner cylinder 2.

Next, at a predetermined position in a mold for vulcanizing and molding the rubber elastic body 4, an integrated body composed of the inner cylinder 2 and the resin molded body and an intermediate fitting 8 formed in a predetermined shape are arranged. ,
Perform rubber vulcanization molding. Thereby, the inner cylinder 2 and the intermediate fitting 8
The rubber elastic body 4 having a predetermined shape and having concave portions forming the main liquid chamber 13 and the sub liquid chamber 14 is formed by interposing the two and interposing them integrally.

Next, the rubber vulcanized molded body is immersed in a water tank filled with the liquid L to be filled in the main liquid chamber 13 and the sub liquid chamber 14, and is formed into a predetermined shape outside the rubber elastic body 4. The formed outer cylinder 1 is inserted, and the outer cylinder 1 is subjected to drawing.
Thus, a liquid-sealed cylindrical vibration damping device in which the liquid L is sealed in the main liquid chamber 13 and the sub liquid chamber 14 is manufactured. FIG. 4 is a left side view of the cylindrical vibration isolator in this state as viewed from the left side in the axial direction of FIG.

On the other hand, the auxiliary stopper 19 is manufactured by integrally vulcanizing and molding the rubber member 22 together with the metal plate 21 having a predetermined shape. Then, the horizontal portion 19b of the auxiliary stopper 19 is inserted into the hollow portion 3 from one axial end of the cylindrical vibration isolator, and the concave groove 23b is fitted to the positioning protrusion 17 while being positioned in the circumferential direction. The hole 23 is fitted to the axial end (the left end in FIG. 1) of the inner cylinder 2, and the substantially U-shaped rubber portion 22 a is covered and held by the protruding tip of the stopper body 18. FIG. 5 shows a left side view of the cylindrical vibration isolator in this state as viewed from the left side in the axial direction of FIG.

Finally, the side stoppers 6 and 7 having a predetermined shape are attached to both ends in the axial direction of the inner cylinder 2 to complete the cylindrical vibration isolator with side stoppers of the present embodiment. In the cylindrical vibration isolator with a side stopper according to the present embodiment configured as described above, for example, the outer cylinder 1 is fitted and fixed to a first mounting member (not shown) on the engine side and the first vibration member on the vehicle body side. 2
The inner cylinder 2 is fixed to a mounting member T (shown by a two-dot chain line in FIG. 1) via bolts, nuts, and the like. In such a state that the side stoppers 6 and 7 are mounted on the automobile, the side stoppers 6 and 7 are axially held between the opposing inner surface of the second mounting member T and the rubber elastic body 4. In addition, the intermediate fitting 8 and the outer cylinder 1 which are arranged eccentrically with respect to the inner cylinder 2 move downward through the elastic deformation of the rubber elastic body 4 by the own weight of the engine or the like attached to the outer cylinder 1. , And are substantially concentric with the inner cylinder 2.

When vibration is applied between the outer cylinder 1 and the inner cylinder 2, the elastic action of the rubber elastic body 4 and the non-fluid flowing between the main liquid chamber 13 and the sub liquid chamber 14 via the orifice passage 15 are performed. Due to the liquid column resonance action of the compressible liquid L, its vibration is effectively attenuated. Also, the fastening force of the bolts and nuts or the like that fix the second mounting member T to the inner cylinder 2 is reduced, and relative rotation occurs between the inner cylinder 2 and the second mounting member T,
In particular, even if the side stopper 6 attached to one end in the axial direction tries to rotate around the inner cylinder 2, the side stopper 6
Are engaged between the positioning projection 17 and the concave groove 24b, between the auxiliary stopper 19 and the fitting concave 25, and the inner cylinder 2,
The relative rotation of the inner cylinder 2 and the auxiliary stopper 19 with respect to the inner cylinder 2 and the auxiliary stopper 19 is effectively restricted by the restraining force based on the friction between the positioning protrusion 17 and the contact surface between the auxiliary stopper 19 and the side stopper 6.

That is, the engagement between the auxiliary stopper 19 having the tip abutting portion (substantially U-shaped rubber portion 22a) protruding radially outward and the fitting recess 25 of the side stopper 6 depends on the moment of inertia and contact. Due to the increase in the area, the engaging force against the relative rotation is increasing. For this reason, the inner cylinder 2
, The relative rotation of the side stopper 6 with respect to the rotation direction can be regulated very effectively.

Therefore, the circumferential displacement of the side stopper 6 can be suppressed, and the original function of the side stopper 6 can be maintained. Further, since it is not necessary to increase the thickness of the side stopper 6 in order to suppress the circumferential displacement of the side stopper 6, the rubber volume of the rubber elastic body 4 can be appropriately secured, and the elasticity of the rubber elastic body 4 can be secured. This is advantageous in terms of improving characteristics and durability.

In the above-described embodiment, the present invention is applied to a liquid-filled cylindrical vibration damping device. However, the present invention is not particularly limited to this. It is of course possible to apply the present invention. Further, in the above-described embodiment, the case where the internal stopper 5 includes the stopper main body 18 and the auxiliary stopper 19 has been described.
Of course, the present invention can be applied to a cylindrical vibration isolator without the auxiliary stopper 19.

[0037]

As described above in detail, according to the cylindrical vibration isolator with the side stopper of the present invention, the inner concave portion is engaged with the internal stopper projecting outward in the radial direction. The relative rotation of the side stopper with respect to the cylinder can be effectively regulated, and therefore, the circumferential displacement of the side stopper can be effectively suppressed.

Further, since it is not necessary to increase the thickness of the side stopper in order to suppress the circumferential displacement of the side stopper, the rubber volume of the rubber elastic body can be properly secured, and the elastic characteristics of the rubber elastic body can be secured. This is advantageous in improving the durability and the like.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along an axial direction of a cylindrical vibration isolator with a side stopper according to an embodiment of the present invention,
FIG. 3 is a cross-sectional view taken along line B.

FIG. 2 is a cross-sectional view along a direction perpendicular to the axis of the cylindrical vibration isolator with a side stopper according to the embodiment of the present invention, and is a cross-sectional view taken along line AA of FIG.

FIG. 3 is a left side view of the cylindrical vibration isolator with a side stopper according to the embodiment of the present invention, as viewed from an axial direction (left side in FIG. 1).

FIG. 4 is a left side view of the cylindrical vibration isolator before the auxiliary stopper and the side stopper are attached according to the embodiment of the present invention, viewed from the axial direction (left side in FIG. 1).

FIG. 5 is a left side view of the cylindrical vibration isolator in a state before a side stopper is attached according to the embodiment of the present invention, viewed from an axial direction (left side in FIG. 1).

FIG. 6 is a front view of an auxiliary stopper according to the embodiment of the present invention.

FIG. 7 is a right side view of the auxiliary stopper according to the embodiment of the present invention as viewed from the right in FIG. 6;

8 is a left side view of the auxiliary stopper according to the embodiment of the present invention as viewed from the left in FIG.

9 is a cross-sectional view of the auxiliary stopper according to the embodiment of the present invention, which is a cross-sectional view taken along line CC of FIG. 8;

FIG. 10 is a right side view of the side stopper according to the embodiment of the present invention as viewed from the right in FIG. 1;

11 is a cross-sectional view of the side stopper according to the embodiment of the present invention, which is a cross-sectional view taken along line DD of FIG. 10;

12 is a cross-sectional view along the axial direction of a conventional cylindrical vibration isolator with a side stopper, and is a cross-sectional view taken along line EE in FIG.

FIG. 13 is a right side view of a conventional cylindrical vibration isolator with a side stopper as viewed from an axial direction (right side in FIG. 12).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outer cylinder 2 ... Inner cylinder 3 ... Cavity part 4 ... Rubber elastic body 5 ... Internal stopper 6, 7 ... Side stopper 17 ... Positioning protrusion part 18 ... Stopper main body 19
... Auxiliary stopper 24 ... Fit hole 24b ... Ditch 25 ... Fit recess
T: Second mounting member

Claims (2)

[Claims] An outer cylinder fixed to a first mounting member, and axially opposite ends disposed radially inward of the outer cylinder and projecting axially outward from axially opposite ends of the outer cylinder, respectively. An inner cylinder fixed to the second mounting member, a substantially cylindrical rubber elastic body having a hollow portion penetrating in the axial direction, interposed between the outer cylinder and the inner cylinder to connect the two, and An internal stopper disposed in the hollow portion and having a tip abutting portion protruding outward in the radial direction to limit a relative displacement between the outer cylinder and the inner cylinder in a radial direction; and both axial ends of the inner cylinder. At least a part of the outer cylinder extends radially outward from the outer cylinder, and has an inner end surface abutting portion at which both axial ends of the outer cylinder can abut. A side provided with a pair of side stoppers for restricting a relative displacement between the outer cylinder and the second mounting member in the axial direction. A cylindrical anti-vibration device with a topper, wherein at least one of the side stoppers has an inner peripheral surface shape corresponding to an outer peripheral surface shape at an axial end portion of the inner cylinder, and has an axial end portion. A fitting recess formed around the fitting hole and having an inner peripheral surface shape corresponding to the outer peripheral surface shape of the internal stopper and fitted to the internal stopper; A cylindrical vibration isolator with side stoppers, characterized by having: 2. The cylinder with a side stopper according to claim 1, wherein the internal stopper comprises a stopper main body fixed to the inner cylinder, and an auxiliary stopper detachably attached to the stopper main body. Type anti-vibration device.