JPH1182607A - Fluid sealed tubular mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To put advantageously to practical use a stopper mechanism capable of exhibiting a displacement amount control function effective in a rebound direction, by diplacing a shaft member to the side of a mass removing cavity relative to an outer tube member if a flexible film demarcating an equilibrium chamber has a structure directly exposed to the mass removing cavity. SOLUTION: A flexible film 16 is substantially divided at a mass removing cavity 40 into both sides in the circumferential direction. A stopper protection part 54 projecting perpendicularly to the axial direction from the side of a shaft member 12 toward the division portion of the flexible film 16 on the side of an outer tube member 14 is formed continuously in the axial direction within the mass removing cavity 40. A pair of stopper half bodies 68 made of elastic material is fit between confronting surfaces of the stopper projection part 54 and of the division portion of the flexible film 16 on the side of the outer tube member 14, from both sides in the axial direction. A stopper crown body 66 is formed and coveringly mounted on and fixed to a projecting end face of the stopper projection part 54, and an outer surface of the stopper crown body 66 is brought into pressing contact with the division portion of the flexible film 16 on the side of the outer tube member 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-filled cylindrical mount having a vibration-proof effect based on the flow action of an incompressible fluid enclosed therein, and more particularly to an excessive vibration load in a direction perpendicular to an axis. The present invention relates to a fluid-filled cylindrical mount provided with a stopper mechanism for limiting a relative displacement amount of a connected body at the time of input.

[0002]

2. Description of the Related Art Conventionally, as one type of a vibration-proof connecting body interposed between members constituting a vibration transmission system and connecting both members, as described in Japanese Utility Model Publication No. 7-16127 and the like. The inner cylinder and the outer cylinder which are spaced apart in the radial direction are connected with the main rubber elastic body, and a hollow space extending through the inner and outer cylinders in the axial direction is formed over substantially half a circumference in the circumferential direction. By doing so, it is possible to reduce or prevent the occurrence of tensile stress in the main rubber elastic body even when an initial load such as a supported body weight or a torque transmitting force is input in the mounted state. A pressure receiving chamber in which a part of the wall is formed of a rubber elastic body and a pressure change is generated at the time of vibration input; and a part of the wall is formed of a flexible film located in the hollow space. To form an equilibrium chamber where volume changes are By filling an incompressible fluid such as water in the equilibrium chamber and providing an orifice passage communicating the pressure receiving chamber and the equilibrium chamber with each other, based on a flow action such as a resonance action of the fluid caused to flow through the orifice passage. 2. Description of the Related Art A fluid-filled cylindrical mount designed to obtain an anti-vibration effect is known.

[0003] In such a fluid-filled cylindrical mount, the inner cylinder is displaced toward the pressure receiving chamber with respect to the outer cylinder by the initial load input at the time of mounting. A stopper mechanism that can effectively limit the relative displacement of the inner cylinder to the outer cylinder in the hollow direction (rebound direction) even when the radial gap between the inner and outer cylinders on the side is widened For example, as described in the above-mentioned publication, a metal sleeve that is vulcanized and bonded to the outer peripheral surface of the main rubber elastic body and fitted and fixed to the inner peripheral surface of the outer cylinder fitting is provided, and The sleeve is recessed into the hollow space to form an equilibrium chamber between the recess and the outer cylinder, and an elastic stopper is axially fitted between the inner cylinder and the recess to form the inner cylinder. The elastic stopper is fixedly supported A rebound stopper mechanism having an appropriate stopper clearance between the elastic stopper and the concave portion, which does not become too large even when an initial load is input, by being pressed against and attached to the inner peripheral surface of the concave portion of the groove. Is composed.

However, in order to realize such a rebound stopper mechanism, a special process such as press working is required to form a concave portion in the metal sleeve, so that the manufacturability and manufacturing cost are deteriorated. There was a problem of doing. In addition, since the load (stopper load) for limiting the relative displacement of the inner and outer cylinders in the rebound direction is applied to the outer cylinder via the hollow metal sleeve, the metal load is reduced. Thoroughly consider the material and thickness of the sleeve, etc.
There is also a problem that it is necessary to ensure durability, and it is inevitable to increase the cost and weight of the metal sleeve.

[0005]

Here, the present invention has been made in view of the above-described circumstances, and a problem to be solved is that when an initial load is input and a hollow space becomes large. Another object of the present invention is to provide a fluid-filled cylindrical mount in which a stopper mechanism capable of exhibiting an effective displacement limiting function in the rebound direction is advantageously realized without providing a concave portion or the like in the metal sleeve.

[0006]

In order to solve such a problem, a feature of the present invention is that a shaft member and an outer cylinder member which are arranged concentrically or eccentrically with each other are connected by a main rubber elastic body. A hollow portion extending through the space between the shaft member and the outer cylinder member in the axial direction is formed over substantially half the circumferential direction, while the hollow space is formed between the shaft member and the outer cylinder member. A part of the wall portion is constituted by the main rubber elastic body to form a pressure receiving chamber in which a pressure change is generated at the time of vibration input, and a flexible film is arranged in the hollow space to provide the flexibility. An equilibrium chamber is formed between the membrane and the outer cylinder member, in which a change in volume is easily permitted, and an incompressible fluid is sealed in the pressure receiving chamber and the equilibrium chamber. Fluid having an orifice passage communicating with each other In the insertable cylindrical mount, the flexible film is substantially divided on both sides in the circumferential direction in the hollow space, and a divided portion of the flexible film from the shaft member side to the outer cylinder member side A stopper protrusion protruding in the direction perpendicular to the axis toward the axis is formed continuously in the axial direction in the hollow space, and a pair of stopper halves made of an elastic material are connected to the stopper protrusion and the outer part. Along the cylindrical member side, the flexible membrane is fitted from both sides in the axial direction between the surfaces facing the divided portion, and the axially outer end portions of the respective stopper halves are fixedly supported by the shaft member, The stopper halves are provided with side locking pieces that are locked to both sides in the width direction of the stopper projections by fixing the axial inner end faces of the stopper halves to each other. , Protrusion of the stopper projection A stopper crown mounted and fixed so as to cover the distal end surface is formed, and an outer surface of the stopper crown is pressed against a divided portion of the flexible film on the outer cylinder member side. Is to be.

In such a fluid-filled cylindrical mount having a structure according to the present invention, an initial load such as the weight of a supported body is applied to the cylindrical mount under the mounted state, so that the rubber elastic body of the main body is elastically deformed, and thus the shaft is mounted. When the member is displaced relative to the outer cylinder member toward the pressure receiving chamber (the side opposite to the hollow space),
The stopper crown fixed to the stopper projection is separated from the outer cylinder member side, and is opposed to the outer cylinder member side at a predetermined distance in the rebound direction (direction perpendicular to the axis).
Then, when an excessive rebound load is input between the shaft member and the outer cylinder member in such a state, the stopper convex portion provided on the shaft member side comes into contact with the outer cylinder member side via the stopper crown. As a result, the relative displacement of the shaft member and the outer cylinder member in the rebound direction is limited.

Here, the flexible membrane disposed in the hollow space is substantially divided, and in such a divided portion, the stopper crown is brought into contact with the outer cylinder member side. Therefore, it is not necessary to provide a metal sleeve having a concave portion as described in the above-mentioned publication, so that simplification of the structure and improvement of manufacturability can be advantageously achieved, and the metal sleeve Thus, large strength performance against stopper load can be easily secured without requiring special reinforcement or the like.

In addition, since the flexible membrane is substantially divided in the circumferential direction and is disposed so as not to abut on the stopper crown, the durability of the flexible membrane is also sufficient. Can be secured.

Further, the stopper crown is supported and fixed to the shaft member at both ends in the axial direction, and is locked on both sides in the width direction of the stopper projection by the side locking pieces. The projection can be sufficiently firmly attached to the projection without any special adhesive treatment or the like, with easy assembling workability, whereby a stable stopper function is exhibited. In addition, since the stopper crown is firmly fixed to the stopper projection in this manner, the stopper crown slides on the flexible film due to a displacement of the stopper crown from the stopper projection. Is also advantageously prevented, and excellent durability and reliability are also achieved.

The stopper projection may be formed integrally with or fixed to the shaft member, and may be formed integrally with the shaft member or separately formed of a metal material or a synthetic resin material. The stopper member can be advantageously formed by fixing the stopper member to the shaft member, or by protruding the surface of the shaft member with a rubber elastic body. Further, the material is not particularly limited, and in addition to a hard material such as a metal or a hard synthetic resin, an elastic material such as a rubber elastic body or foamed urethane can be adopted, or the surface of the hard material is made of rubber. It is also possible to adopt a composite structure or the like covered with an elastic material such as.

The divided portion of the flexible film to which the stopper crown is pressed is only required to have a structure substantially free of a flexible film made of a rubber film or the like. Need not be exposed to the public. Specifically, the divided portion of the flexible film is formed, for example, by thickening the flexible film to form a thick rubber layer, or by forming an outer cylindrical member with respect to the divided portion of the flexible film. It can be advantageously configured by fixing a fixed rigid material.

Further, the pair of stopper halves constituting the stopper crown are formed for reasons of manufacturing and assembly.
Desirably, the pair of stopper halves have the same shape having an engagement protrusion and an engagement hole on an axially inner end face fixed to each other. The engagement projections formed on the half body are configured to be fixed to each other by being engaged with the engagement holes formed on the other stopper half body. If a stopper half having such a structure is employed, a pair of stopper halves are mounted without distinction on the left and right, and the engagement protrusion is merely fitted into the engagement hole, without adding a special bonding process or the like.
An integral stopper crown can be formed.

The structure for fixing the stopper halves to each other is not limited at all. In addition to various types of engagement structures, bonding, fixing by other fixing members, or the like is employed, or a combination thereof is employed. It is also possible. Further, in order to more advantageously secure the fixing force of the stopper crown to the stopper projection, the stopper crown may be bonded to the stopper projection.

The structure for fixing and supporting the stopper halves to the shaft member is not particularly limited, but preferably, for example, an annular mounting portion is provided at the axially outer end of each of the stopper halves. Positioning means for externally fitting and fixing to the axial end of the shaft member by the mounting portion, and restricting relative displacement of the mounting portion with respect to the shaft member in the circumferential direction. Is adopted. By employing the stopper half having such a structure, the stopper half can be easily and firmly supported by the shaft member. In addition, since the effect of preventing the displacement of the stopper mechanism is also exhibited, the durability and reliability of the stopper mechanism are further improved. In order to advantageously obtain the supporting strength of the stopper half by the shaft member, it is desirable that the inner diameter of the mounting portion be set slightly smaller than the outer diameter of the shaft member. In addition, the positioning means is provided with a projection on one of them on the outer peripheral surface of the shaft member and the inner peripheral surface of the mounting portion, which are fitted to each other, and is engaged with the projection on one of the other. It can be advantageously configured by forming a concave portion.

Further, the stopper convex portion can prevent contact with the flexible film as much as possible and can secure a sufficient area of the divided portion of the flexible film facing the outer cylinder member side. Desirably, the material and the specific structure are not particularly limited. For example, a stopper main body formed of a hard material and provided integrally with the shaft member, and having a protruding height at both axial side portions higher than a central portion, and a protruding tip of the stopper main body formed of an elastic material By being fixed to the surface, a stopper convex portion composed of a convex portion surface layer that makes the protruding height of the stopper main body substantially uniform in the axial direction can be advantageously employed. In such a stopper convex portion, the projecting height of the central portion of the stopper main body is reduced, so that the contact force when the stopper comes into contact with the outer cylinder member side is larger than the axial end portions of the outer cylinder member. The central part will be smaller. Therefore,
Even when the equilibrium chamber region is formed in a state where the equilibrium chamber region is divided on both sides in the circumferential direction with the divided portion of the flexible membrane interposed therebetween, the two equilibrium chamber regions are separated from each other in the axial center portion of the divided portion. Is formed, the input of the stopper load to the portion where the fluid communication passage is formed is reduced, and the communication state of the fluid communication passage can be advantageously maintained.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, one embodiment of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 to 3 show an engine mount 10 for an FF type vehicle as one embodiment of the present invention. The engine mount 10 includes an inner cylinder fitting 12 as a shaft member and an outer cylinder fitting 14 as an outer cylinder member.
The inner cylindrical fitting 12 and the outer cylindrical fitting 14 are disposed at a predetermined distance from each other in a radial direction and are elastically connected by a main rubber elastic body 16 interposed between the fittings 12 and 14. The power unit is fixedly attached to the body (not shown) and the power unit, so that the power unit is supported on the body by vibration isolation.

More specifically, the inner cylindrical fitting 12 has a thick small-diameter cylindrical shape. A stopper member 18 formed of a hard material such as a metal or a synthetic resin is fixed on the outer peripheral surface of the inner cylindrical fitting 12 in an externally inserted state. The stopper member 18 has a cylindrical mounting portion 20 that is fixed to the inner cylindrical fitting 12 in an externally inserted state, and has an action convex portion 22 and a stopper main body portion on the outer peripheral surface of the mounting portion 20. 24 project in the radial direction of one side of the mounting part 20 toward mutually opposite sides. The operation convex portion 22 is formed in a substantially mushroom shape in which a protruding distal end portion of a columnar portion extending radially from the mounting portion 20 is expanded in an umbrella shape, and is positioned at the axial center of the inner cylinder fitting 12. I have. On the other hand, the stopper main body 24 has a constant width: t in the axial direction of the inner cylindrical fitting 12.
And the protrusion height: h2 of the axial side portions 28, 28 is made larger than the protrusion height: h1 of the axial center portion 26, It has a stepped tip surface shape. In addition, such a stopper member 18 is advantageously formed, for example, by filling a molding cavity in which the inner cylindrical fitting 12 is set with a synthetic resin material. It is possible to

A metal sleeve 30 is disposed radially outward of the inner cylindrical fitting 12 at a predetermined distance and eccentric by a predetermined amount. The metal sleeve 30 has a thin large-diameter cylindrical shape, and has a substantially rectangular first window 32 and a second rectangular The window 34 is formed so as to face one direction in the radial direction (vertical direction in the figure) which is the eccentric direction.
A groove 36 extending in the circumferential direction and connecting the windows 32 and 34 is formed between one end of the first window 32 and the second window 34 in the circumferential direction.

Further, a rubber elastic body 16 is interposed between the inner metal fitting 12 and the metal sleeve 30. As shown in FIG. 4, the main rubber elastic body 16 has a substantially large-diameter, thick-walled cylindrical shape, and the inner cylindrical metal fitting 12 is formed on the inner peripheral surface, Sleeve 30
Are vulcanized and bonded to form an integrally vulcanized molded product. Note that a thin seal rubber layer 38 is formed on the outer peripheral surface of the metal sleeve 30 over substantially the entire surface. Also,
On one side in the eccentric direction of the inner cylinder fitting 12 and the metal sleeve 30 (the side where the separation distance in the eccentric direction is larger, the lower side in the figure), the space between the inner cylinder fitting 12 and the metal sleeve 30 is set in the axial direction. The hollow portion 40 extending through the hole is formed over substantially half a circumference in the circumferential direction. That is, on one side of the eccentric direction where the lightening space 40 is provided, the main body rubber elastic body 16 is not substantially interposed between the inner cylinder fitting 12 and the metal sleeve 30, and the main body rubber elastic body 16 is the inner cylinder fitting 12
And the other side of the eccentric direction of the metal sleeve 30 (the side where the separation distance in the eccentric direction is smaller, the upper side in the figure)
It is interposed. In addition, the hollow portion 40 is provided with a taper that slightly expands from the central portion in the axial direction toward both sides with respect to the outer peripheral surface in order to advantageously secure the releasability during molding. .

The main rubber elastic body 16 is formed with a first pocket portion 42 opened on the outer peripheral surface, and is opened on the outer peripheral surface through the first window 32 of the metal sleeve 30. On the other hand, the second window 34 of the metal sleeve 30 is formed integrally with the main rubber elastic body 16 and the outer peripheral edge is vulcanized and bonded to the metal sleeve 30.
4 covers the inner peripheral side. The rubber elastic film 44 is provided at a central portion in the circumferential direction at a thick plate-like connecting rubber portion 46 extending across the second window portion 34 in the axial direction, and at both circumferential sides of the connecting rubber portion 46. It is constituted by a pair of flexible rubber films 48, 48 as a pair of flexible films each having a thin-walled bag shape. In short, a pair of bag-like rubber films 48, 48
Are divided substantially on both sides in the circumferential direction by the connecting rubber portion 46, the connecting rubber portion 46 constitutes a divided portion, and the bag-like rubber films 48, 48 define the second window portion. Second pocket portions 50, 50 that open to the outer peripheral surface through 34 are formed. In the connecting rubber portion 46, a communication groove 51 which is opened on the outer peripheral surface and extends in the circumferential direction across the two second pocket portions 50, 50 is provided.
Are formed with a sufficiently large width.
The second pocket portions 50 and 5 having a divided structure.
0 are communicated with each other.

Further, in the first pocket portion 42, an operation convex portion 22 is projected from the center of the bottom portion, and an umbrella-shaped end portion of the operation convex portion 22 is formed in the first pocket portion 42. It is located at the approximate center of the. On the other hand, the stopper main body 24 is protruded in the lightening space 40 over the entire length in the axial direction. The entire outer peripheral surface of the stopper main body 24 is covered with a front rubber layer 52 integrally formed with the main rubber elastic body 16. By filling the inside of the portion 26, the protrusion height of the stopper body 24 is made substantially constant over the entire length in the axial direction. In short, in the present embodiment, the stopper main body 24 constitutes a hard stopper main body, and the surface rubber layer 52 constitutes an elastic convex surface layer. The stopper main body 24 and the surface rubber The layer 52 cooperates to form the stopper projection 54. The stopper convex portion 54 is opposed to the connecting rubber portion 46 of the rubber elastic film 44 at a predetermined distance in the radial direction. Here, the stopper convex portion 54 is formed to have a width smaller than the circumferential width of the connecting rubber portion 46, and is opposed to a substantially central portion of the connecting rubber portion 46 in the circumferential direction. 4
8 and 48 are located between the bag-shaped rubber films 48 and 48 with a sufficient distance that contact with them can be effectively avoided.

The axially opposite sides 28, 28 of the stopper main body 24 constituting the stopper projection 54 are radially opposed to axially opposite sides of the connecting rubber part 46. In particular, in the present embodiment, the peripheral portion of the second window portion 34 in the metal sleeve 30 is formed on each of the axially opposite side portions of the connecting rubber portion 46 where the axially opposite side portions 28, 28 are opposed to each other. It is vulcanized and adhered, so that large strength is exhibited. On the other hand, the axially central portion 26 of the stopper body 24, which is radially opposed to the axially central portion 26 of the connecting rubber portion 46, has a lower projecting height than the axially opposite side portions 28, 28. The outer rubber layer 52 is set thicker and softer.

Then, the outer tube fitting 14 is externally inserted into such an integrally vulcanized molded product, and is fitted and fixed to the outer peripheral surface of the metal sleeve 30 so that the first and second pocket portions 42 are formed. , 50, 50, the concave groove 36, and the communication groove 51 are each covered with a fluid-tight cover. Thereby, a part of the wall is formed of the main rubber elastic body 16 and a pressure receiving chamber 56 in which an internal pressure change is generated at the time of vibration input, and a part of the wall is formed of the bag-like rubber films 48, 48. Those bag-like rubber films 4
An equilibrium chamber 58 whose volume change is easily allowed based on the deformation of the pressure receiving chambers 56 is formed.
An orifice passage 60 is formed, which communicates with the balance chamber 58. The pressure receiving chamber 56 and the equilibrium chamber 58,
Each of the orifice passages 60 is filled with a predetermined incompressible fluid such as water, alkylene glycol, polyalkylene glycol, or silicone oil, and is generated between the pressure receiving chamber 56 and the equilibrium chamber 58 at the time of vibration input. The pressure difference causes a fluid flow through the orifice passage 60 between the two chambers 56 and 58. The two second pockets 50, 50
The communication groove 51 is communicated with the communication passage 61 formed by being covered with the outer tube fitting 14, so that a substantially single equilibrium chamber 58 is formed.

Thus, in the engine mount 10 according to the present embodiment, the inner cylinder 12 and the outer cylinder 14 are attached to one of the body and the power unit, and the inner cylinder 12 and the outer cylinder 14 are mounted between the inner and outer cylinders 12 and 14. When radial vibrations, which are substantially eccentric directions, are inputted, a fluid flow is generated between the pressure receiving chamber 56 and the equilibrium chamber 58 through the orifice passage 60, so that the fluid has a flow such as a resonance action. An anti-vibration effect based on the action is exhibited. In the pressure receiving chamber 56, the umbrella-shaped tip of the operation convex portion 22 is positioned so as to spread at an intermediate portion in the vibration input direction, and the outer peripheral edge of the umbrella-shaped tip and the inner peripheral surface of the pressure-receiving chamber 56 are located. An annular constricted channel 62 is formed therebetween. At the time of vibration input, the vibration-proof effect is also exerted by the flow action such as the resonance action of the fluid made to flow through the constricted flow path 62. In particular, in the present embodiment, while an effective vibration damping effect against low-frequency vibration is exerted based on the resonance action of the fluid caused to flow through the orifice passage 60, the resonance action of the fluid caused to flow through the constricted flow path 62 is achieved. The orifice passage 60 and the constricted passage 62 are appropriately set in length, cross-sectional area, and the like so that an effective vibration damping effect against high-frequency vibration is exhibited. In the engine mount 10, the weight of the power unit is exerted between the inner and outer tube fittings 12 and 14 in the mounted state, so that the main rubber elastic body 16 is elastically deformed, as shown in FIG. The tube fitting 12 and the outer tube fitting 14 are positioned substantially concentrically.

Also, under such an attached state of the engine mount 10, in a bounding direction (a direction in which the inner cylinder 12 is displaced toward the pressure receiving chamber 56 with respect to the outer cylinder 14) between the inner and outer cylinders 12, 14. On the other hand, when an excessive load such as an impact load is applied, the protruding distal end surface of the action convex portion 22 is brought into contact with the outer cylinder fitting 14, so that the relative displacement amount of the inner and outer cylinder fittings 12, and thus the main body. Rubber elastic body 16
Is limited. Note that a cushioning rubber layer 64 is formed on the protruding distal end surface of the operation projection 22.

On the other hand, an impact load or the like is generated between the inner and outer cylinders 12 and 14 in a rebound direction (a direction in which the inner cylinder 12 is displaced toward the hollow space 40 with respect to the outer cylinder 14). When an excessive load is applied, the stopper projection 54
Can be brought into contact with the connecting rubber portion 46 on the outer tube fitting 14 side. Here, a stopper crown 66 is attached and fixed to the distal end portion of the stopper projection 54 so as to cover the entirety thereof, and the stopper projection 54 is connected to the connecting rubber portion via the stopper crown 66. 46.

The stopper crown 66 is formed by combining a pair of stopper halves 68 formed of a rubber elastic body with each other as shown in FIGS. The stopper half 68 has a bottom wall portion 70 having substantially the same width as the stopper convex portion 54, and a pair of side wall portions 7 protruding from both sides in the width direction of the bottom wall portion 70.
It has a substantially gutter-like shape integrally provided with the protrusions 2 and 72 and extending in the axial direction length of substantially half of the stopper convex portion 54. At one end in the longitudinal direction of the stopper half 68, a mounting portion 7 which is bent at substantially a right angle and protrudes to the same side as the side wall portion 72, and has a circular mounting hole 74 at the protruding front end.
6 are provided. Further, at the other end in the longitudinal direction of the stopper half 68, on both sides in the width direction of the end surface of the bottom wall portion 70, a tapered engaging projection 78 is formed.
An engagement hole 80 having a smaller diameter than that is formed.

Then, such a pair of stopper halves 6
8 and 68 are respectively fitted on both sides in the axial direction with respect to the hollow portion 40 in the integrally vulcanized molded product of the main body rubber elastic body 16, and both longitudinal end surfaces are overlapped, and each one stopper half is provided. The engaging projections 78 of the body 68 are integrally assembled by being pressed into the engaging holes 80 of the other stopper half 68. Also, both stopper halves 68,
68 are externally inserted from both ends in the axial direction of the inner cylindrical member 12, respectively, so that the inner cylindrical member 1 is attached to the inner cylindrical member 12.
2 is fixedly attached. This allows
An elongate stopper crown 66 is formed as a whole that covers the projecting distal end portion of the stopper convex portion 54 and covers the entire projecting distal end surface of the stopper convex portion 54.

Here, the stopper crown 66 is used.
Since the side wall portions 72, 72 are overlapped and locked on both side surfaces in the width direction of the stopper convex portion 54, the side walls 72 are closely contacted from the distal end surface of the stopper convex portion 54 to both side surfaces over the entire length. As a result, excellent positioning performance and position fixing force with respect to the stopper convex portion 54 are exhibited. Moreover, since the stopper crown 66 is attached to the inner cylindrical fitting 12 by the attaching portions 76 on both sides in the longitudinal direction, the positioning force with respect to the stopper convex portion 54 can be more effectively exerted. In particular, in the present embodiment, at both ends in the axial direction of the inner cylindrical fitting 12,
Positioning projection 82 projecting radially outward at one location on the circumference
Are formed by the main rubber elastic body 16, and the positioning projections 8 are provided on the periphery of the mounting holes 74 in the mounting portions 76 of the stopper crown 66, respectively.
2 is formed, and by the engagement of the positioning projection 82 with the notch groove 84, the circumferential displacement of the mounting portion 76 with respect to the inner cylinder fitting 12 is regulated, and the stopper crown 66 is formed. , A more effective positioning property with respect to the stopper convex portion 54 is exhibited.

The thickness of the bottom wall 70 of each stopper half 68 is determined by the thickness of the main rubber elastic body 16.
Is substantially equal to or larger than the gap size (the distance between the radially opposed surfaces of the stopper convex portion 54 and the connecting rubber portion 46) of the lightening cavity 40 in the integrally vulcanized molded product of the above. Inner and outer cylinder fittings 1 by power unit load
In a state where the two and 14 are positioned substantially concentrically, an appropriate stopper clearance in the rebound direction is formed. In particular, in the present embodiment, the thickness of the bottom wall portion 70 is set to be larger than the gap size (see FIG. 4) of the hollow portion 40 in the integrally vulcanized molded product of the main rubber elastic body 16. When the stopper halves 68, 68 are fitted into the vacant space 40, the outer surface of the stopper crown 66 is pressed against the connecting rubber portion 46, and the inner cylinder 12 is moved by a predetermined amount with respect to the outer cylinder 14. Only at a position displaced toward the pressure receiving chamber 56 side.
Further, preferably, the stopper halves 68, 68 are assembled to the integrally vulcanized molded product of the main rubber elastic body 16 before the outer cylinder fitting 14 is assembled. That is,
The integrally vulcanized molded product having the stopper halves 68, 68 assembled therein is immersed in an incompressible fluid, and the outer cylinder fitting 14 is assembled in the incompressible fluid to seal the incompressible fluid, thereby mounting the mount. As a result, the generation of the fluid pressure at the time is reduced, and the variable volume of the equilibrium chamber 58 is advantageously secured, so that the vibration isolation characteristics can be stabilized.

Therefore, in the engine mount 10 having the above-described structure, the stopper crown 66 mounted and fixed to the distal end of the stopper convex portion 54 to form an appropriate size of stopper clearance on the rebound side is mounted. A pair of stopper halves 68 combined at the center in the axial direction,
68, which are locked on both side surfaces of the stopper projection 54 on both sides in the width direction and are supported and assembled by the inner cylindrical fitting 12 on both ends in the axial direction, so that a special bonding process is performed. The stopper crown 66 is firmly attached to the stopper convex portion 54 without the need for the like, so that a stable rebound stopper function is realized with a simple structure and excellent manufacturability. It can be done. In particular, the stopper crown 66
However, since it is constituted by a pair of stopper halves 68, 68 made of a simple rubber and can be easily and advantageously assembled, extremely excellent cost performance is achieved.

Moreover, the width of the stopper projection 54 and the stopper crown 66 is set to be smaller than the circumferential dimension of the connecting rubber portion 46 forming the circumferentially divided portion of the pair of bag-like rubber films 48, 48. Since the stopper projection 54 and the stopper crown 66 are advantageously prevented from contacting the bag-like rubber films 48, 48, the bag-like rubber film 4
Even if the structures 8 and 48 are directly exposed in the hollow space 40, the durability of the bag-like rubber films 48 and 48 is not reduced by the rebound stopper mechanism.

Particularly, in the present embodiment, the stopper main body 2
The projecting distal end surface of the step 4 has a stepped shape, so that the contact pressure of the stopper convex portion 54 on the outer cylinder member 14 side is reduced at the central portion 26 in the axial direction rather than the both side portions 28 in the axial direction. Therefore, even under the condition where the rebound stopper acts, the flow path cross-sectional area of the communication path 61 can be advantageously secured, and the mount vibration isolation characteristics can be stabilized.

In the present embodiment, the pair of stopper halves 68, 68 have the same shape, and the engagement protrusion 78 formed on the abutting end surface and the engagement hole 80 are press-fitted. Since they are fixed to each other, better manufacturability and assemblability of the stopper crown 66 can be achieved.

As described above, one embodiment of the present invention has been described in detail. However, this is a literal example.
By the specific description of such an embodiment,
It is not to be construed as limiting.

For example, two independent equilibrium chambers are formed by two bag-like rubber films 48, 48 formed on both sides in the circumferential direction with the connecting rubber portion 46 interposed therebetween. It is also possible to communicate with the pressure receiving chamber 56 by an independent orifice passage.
In this case, it is not necessary to form the communication passage 61 in the connection rubber portion 46, and different tunings can be performed on each orifice passage.

The form of the orifice passage 60 is appropriately adjusted in accordance with the required vibration-proof performance and the like, and is limited by the embodiment described above, such as the formation site, length and cross-sectional area. Not something.

Further, the action convex portion 2 in the above embodiment is used.
In the present invention, it is not always necessary to provide the bounding stopper mechanism composed of 2 in the bounding direction.

In the above-mentioned embodiment, although not explicitly shown in the drawings, a bracket or the like fixedly attached to the inner cylindrical fitting 12 is provided at a position facing both axial end surfaces of the stopper crown 66. The stopper halves 68, 68 can be separated and the inner cylinder fitting 1 can be
It is also possible to prevent the escape from the position 2 in the axial direction.

In addition, in the above embodiment, a specific example in which the present invention is applied to an engine mount for an automobile is shown. However, the present invention is also applicable to a body mount or a differential mount for an automobile, or various cylinders other than an automobile. Of course, any of these can be similarly applied to the mold mount.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements, and the like can be made, and unless such embodiments depart from the spirit of the present invention.
Both are included in the scope of the present invention,
Needless to say.

[0044]

As is apparent from the above description, in the fluid-filled cylindrical mount constructed in accordance with the present invention, the flexible film defining the equilibrium chamber is directly exposed to the hollow space. Even in the structure described above, the stopper mechanism in the rebound direction in which the shaft member is displaced toward the hollow space side with respect to the outer cylinder member is advantageously configured while sufficiently securing the durability of the flexible film. obtain.

Furthermore, since the stopper crown which is mounted over the stopper convex portion and which realizes an appropriate stopper clearance in the rebound direction is formed by a pair of stopper halves consisting of only the elastic body, the present invention is excellent. Since it is attached and fixed to the stopper convex portion with assemblability and mounting strength, a rebound stopper mechanism capable of exhibiting a stable stopper function can be advantageously realized with a simple structure and excellent manufacturability.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an engine mount as one embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a right side view in FIG.

FIG. 4 is a longitudinal sectional view showing an integrally vulcanized molded product constituting the engine mount shown in FIG. 1;

5 is an explanatory longitudinal sectional view showing a state where the engine mount shown in FIG. 1 is mounted on a vehicle.

6 is a plan view showing a stopper half constituting a stopper crown in the engine mount shown in FIG. 1. FIG.

FIG. 7 is a right side view of the stopper half shown in FIG. 6;

8 is a longitudinal sectional view of the stopper half shown in FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 engine mount 12 inner cylinder fitting 14 outer cylinder fitting 16 main rubber elastic body 18 stopper member 24 stopper main body section 40 hollow section 46 connecting rubber section 48 bag-like rubber film 52 surface rubber layer 54 stopper convex section 56 pressure receiving chamber 58 Equilibrium chamber 60 Orifice passage 66 Stopper crown 68 Stopper half 72 Side wall 76 Attachment 78 Engagement projection 80 Engagement hole

Claims (4)

[Claims] 1. A shaft member and an outer cylinder member which are arranged concentrically or eccentrically to each other are connected by a main rubber elastic body, and extend through the space between the shaft member and the outer cylinder member in the axial direction. The hollow portion is formed over substantially half the circumferential direction, and a part of the wall portion is formed by the main rubber elastic body between the shaft member and the outer cylindrical member, so that a pressure change occurs when vibration is input. An equilibrium chamber is formed in which a pressure receiving chamber to be generated is formed, and a flexible film is disposed in the hollow space, and a volume change between the flexible film and the outer cylinder member is easily allowed. A fluid-filled cylindrical mount, wherein an incompressible fluid is sealed in the pressure receiving chamber and the balancing chamber, and an orifice passage communicating the pressure receiving chamber and the balancing chamber with each other is formed. A flexible membrane is wrapped around the hollow space. Are substantially divided on both sides, and a stopper projection protruding from the shaft member side in a direction perpendicular to the axis toward the divided portion of the flexible film on the outer cylinder member side is provided in the hollow space. A pair of stopper halves, which are formed continuously in the axial direction and are made of an elastic material, are provided in the axial direction between the opposing surfaces of the stopper convex portion and the divided portion of the flexible film on the outer cylinder member side. The stoppers are fitted in from both sides, and the axially outer end portions of the respective stopper halves are fixedly supported by the shaft member, and the axially inner end surfaces of the stopper halves are fixed to each other, whereby the stoppers are formed. A stopper crown body provided with side locking pieces that are locked on both sides in the width direction of the protrusion, covered over the front end of the stopper protrusion, and mounted and fixed so as to cover the protruding front surface of the stopper protrusion. Are formed, and the A fluid-filled tubular mount, wherein an outer surface of the topper crown is brought into contact with a divided portion of the flexible membrane on the outer tubular member side. 2. The pair of stopper halves have the same shape having an engagement projection and an engagement hole on an axially inner end face fixed to each other, and the stopper half formed on the one stopper half is formed. The fluid-filled cylindrical mount according to claim 1, wherein the engagement protrusions are fixed to each other by being engaged with the engagement holes formed in the other stopper half. 3. The pair of stopper halves have the same shape provided with an annular mounting portion at an axially outer end portion, and each of the stopper halves is attached to the axial end portion of the shaft member by the mounting portion. The fluid-filled cylindrical mount according to claim 1 or 2, further comprising positioning means fixedly fitted to the outside and restricting a relative displacement of the mounting portion with respect to the shaft member in a circumferential direction. 4. A stopper main body formed of a hard material and provided integrally with the shaft member, wherein the protrusion height of both axial side portions is higher than that of a center portion, and an elastic material. 4. A projection surface layer formed to be fixed to the tip end surface of the stopper body so as to make the projection height of the stopper body substantially constant in the axial direction. Fluid-filled cylindrical mount as described.