JPH09264371A - Fluid seal type cylindrical mount device and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of a bottom wall part on each side in the circumferential direction of a pressure bearing chamber formed of a body rubber elastic body and to simplify the structure of an umbrella part while securing the excellent manufacturing property in a liquid seal type cylindrical mount device provided with the umbrella part in which a center part of the pressure bearing chamber is narrowed to form a narrow flow passage. SOLUTION: Inner wall surface 58, 60 of opening parts adjacent in the circumferential direction of a first pocket part 42 to form a pressure bearing chamber and a second pocket part 44 to form a balance chamber, and a back surface 62 of an umbrella member 20 are inclined surfaces which are inclined toward the first pocket part 42 side and parallel to each other. A body rubber elastic body 16 in which generation of the tensile stress is reduced or prevented can be formed using a two-split type forming die of side-opening type having mating surfaces on the radial line X which is the opposite direction of the first pocket part 42 and the second pocket part 44.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-filled type cylindrical mount device and a method of manufacturing the same, in which a vibration-damping effect is obtained based on a flow action of a fluid enclosed therein, and particularly, a tension in a rubber elastic body is used. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-filled tubular mount device that is easy to manufacture and that can reduce or prevent the generation of stress and exhibit excellent durability, and a manufacturing method thereof.

[0002]

2. Description of the Related Art As a type of a vibration isolator that is interposed between members constituting a vibration transmission system to couple those members with vibration isolation, it has been conventionally arranged at a predetermined distance between a shaft member and the outside thereof. A main body rubber elastic body is interposed between the main body rubber elastic body and the shaft member and the middle sleeve is vulcanized and adhered to the middle sleeve. A first pocket portion and a second pocket portion are provided on both sides in the radial direction of the elastic body sandwiching the shaft member in the main vibration input direction, and the first pocket portion and the second pocket portion are respectively opened to the outer peripheral surface through the opening windows of the intermediate sleeve. From the first pocket portion, the tip portion of which extends in an umbrella shape to constrict the inside of the first pocket portion, and an axially penetrating bottom wall portion of the second pocket portion to extend the second pocket portion. Bottom of the pocket While forming a slit with a thin rubber film that can be easily deformed, a seal rubber layer is provided on the outer peripheral surface of the intermediate sleeve, and both the first pocket portion and the second pocket portion are formed on the outer peripheral surface of the intermediate sleeve. By attaching the outer cylinder member to the integrally vulcanized molded product in which a groove extending in the circumferential direction across the space is formed by a seal rubber layer and fitting and fixing the outer cylinder member on the intermediate sleeve, Cover the openings of the first pocket portion and the second pocket portion to form a pressure-receiving chamber into which a non-compressible fluid is enclosed and vibration is input, and a volume-balanced equilibrium chamber. A fluid-filled tubular mount device having a structure in which an opening of a concave groove is covered with a tubular member to form an orifice passage communicating between the pressure receiving chamber and the equilibrium chamber is known. In such a tubular mount device, when vibration is input between the shaft member and the outer tubular member, a flow action such as a resonance action of the fluid that is caused to flow in the orifice passage, and an annular shape formed in the pressure receiving chamber by the umbrella member. On the basis of the flow action such as the resonance action of the fluid that is caused to flow in the constricted flow path of each, it is possible to obtain the vibration isolation effect which is difficult to obtain only with the main body rubber elastic body, and therefore, for example, for automobiles. It is suitable for use as an engine mount.

By the way, in the tubular mounting device having such a structure, when a supporting load such as the weight of the power unit is applied from the outside in a mounted state like an automobile engine mount, the tensile stress in the main rubber elastic body is increased. A pair of members that are formed of a rubber elastic body and that extend in the radial direction from the shaft member toward the intermediate tubular member to form the bottom wall portion of the first pocket portion while reducing or preventing the occurrence of In order to secure an effective free length in the radial direction of the support arm portion, improve durability, and obtain sufficient mount spring rigidity, for example, Japanese Patent Laid-Open No. 63-28934.
As described in Japanese Patent No. 9 or the like, a structure in which such a pair of support arm portions are inclined so as to widen toward the first pocket portion side is preferably adopted.

However, in order to form the pair of inclined support arm portions as described above, the bottom wall surface of the first pocket portion (inner wall surface of the opening on both sides in the circumferential direction) must be an inclined surface. As a molding die of an elastic body, it has a die-matching surface (parting line) on a first radial line extending in the main vibration input direction and is parallel to a second radial line orthogonal to the first radial line. It becomes extremely difficult to adopt a mold having a general side-opening mold-splitting structure in which molds are opened on both sides in the direction.

Therefore, in order to deal with this, conventionally, a mold matching surface is provided on the second radial direction line, and both sides are directed in the direction parallel to the first radial direction line (that is, the main vibration input direction). A mold having a vertically open mold-breaking structure that is opened in a mold is used. However, in such a mold, it is inevitable that the umbrella-shaped portion of the umbrella member undercuts. Since it has to be attached after molding the main rubber elastic body as a divided structure, the structure becomes complicated, the number of parts and the manufacturing process increase, and the manufacturability and the cost performance are significantly lowered.

Moreover, when a mold having a vertically open mold split structure is adopted, the mold fitting surface comes to the portion where the groove formed by the seal rubber layer is formed, and therefore the rubber groove generated on the mold fitting surface causes the groove and thus the orifice. There is a risk that the passage will be narrowed or partitioned, which will impede the vibration isolation effect based on the flow action of the fluid flowing through the orifice passage, making it difficult to obtain the desired vibration isolation characteristics in a stable manner. There was also a problem.

[0007]

The present invention has been made in view of the circumstances as described above, and the problem to be solved is that the structure is complicated, the manufacturability is deteriorated, or the anti-vibration property is impaired. While avoiding the occurrence of problems such as the above, the generation of tensile stress in the main rubber elastic body is effectively reduced or prevented, and the durability can be advantageously improved. A mold mounting device and a method for manufacturing a fluid-filled tubular mounting device.

[0008]

In order to solve such a problem, a feature of the present invention relating to a fluid-filled cylindrical mount device described in claim 1 is that a predetermined distance is provided between a shaft member and its outside. A main body rubber elastic body is interposed between the intermediate sleeves arranged apart from each other, and the main body rubber elastic body is vulcanized and adhered to the shaft member and the intermediate sleeve, while a plurality of opening windows are formed in the intermediate sleeve. In addition, a first pocket portion and a second pocket portion are provided on both sides in the radial direction of the main body rubber elastic body sandwiching the shaft member in the main vibration input direction, and the first pocket portion and the second pocket portion are provided on the outer peripheral surface through the opening window of the intermediate sleeve. An umbrella member is provided which is opened and further projects from the shaft member into the first pocket portion so that the tip end thereof spreads like an umbrella and narrows the inside of the first pocket portion, and the bottom wall portion of the second pocket portion is provided. While forming a slit that extends through in the axial direction to make the bottom wall portion of the second pocket portion a thin rubber film that is easily deformed, a seal rubber layer is provided on the outer peripheral surface of the intermediate sleeve, and the slit of the intermediate sleeve is formed. For an integrally vulcanized molded article in which a groove extending in the circumferential direction across the outer peripheral surface between both openings of the first pocket portion and the second pocket portion is formed by the seal rubber layer, By externally inserting the outer cylinder member and fittingly fixing it to the intermediate sleeve,
The outer cylinder member covers the openings of the first pocket portion and the second pocket portion to form a pressure receiving chamber and a variable volume equilibrium chamber in which incompressible fluid is enclosed and vibration is input. In addition, in the fluid-filled tubular mount device, the outer tubular member covers the opening of the concave groove to form an orifice passage that communicates the pressure-receiving chamber and the equilibrium chamber. An inner wall surface of each opening located adjacent to each other in the circumferential direction of the second pocket portion and a back surface of a tip end portion of the umbrella member that spreads in an umbrella shape sandwich a first radial line extending in a main vibration input direction. The two side portions are inclined surfaces parallel to each other, which are inclined toward the first pocket portion side with respect to the second radial line orthogonal to the first radial line.

In the fluid-filled cylindrical mount device having the structure according to the present invention, the inner wall surfaces of the openings located adjacent to each other in the circumferential direction of the first pocket portion and the second pocket portion, and the umbrella. Since the back surface of the tip portion that spreads like an umbrella in the member is an inclined surface parallel to each other,
When molding the main rubber elastic body, a molding die with a laterally open mold split structure is used that has a mating surface on the first radial line extending in the main vibration input direction. It is possible to open the mold from side to side along the inclined surface of.

As a result, a pair of support arm portions, which constitute the bottom wall portion of the first pocket portion in a cross section in the direction perpendicular to the axis, are inclined so as to expand toward the first pocket portion side,
Since it can be advantageously formed by using a forming die having a laterally-opening die-splitting structure, the durability of the main rubber elastic body can be advantageously ensured.

Moreover, undercutting in the umbrella member can be avoided, and the umbrella member can be provided in advance on the shaft member side before molding the main rubber elastic body, so that the number of parts is small and the structure is simple. It is also possible to advantageously improve the productivity and manufacturability.

Further, since the main body rubber elastic body can be molded by adopting a molding die having a laterally open mold splitting structure having a mold matching surface on the first radial line, the first pocket portion and the first pocket portion can be molded. It is possible to prevent the generation of rubber burrs in the middle of the concave groove extending across the openings of the second pockets, and it is possible to stably form the desired orifice passage,
As a result, stabilization of the vibration damping property can be achieved.

Furthermore, in the fluid-filled cylindrical mount device having the structure according to the present invention, the inner wall surfaces of the opening portions located adjacent to each other in the circumferential direction of the first pocket portion and the second pocket portion, and the umbrella. Since the back surface of the tip end portion that spreads like an umbrella in the member is an inclined surface that is parallel to each other, the volume of the pressure receiving chamber and the equilibrium chamber is ensured and the orifice passage (concave groove) is formed while preventing the occurrence of undercut. The securing of the distance between the openings of the first pocket portion and the second pocket portion, and thus the length of the orifice passage, which are formed, can be advantageously achieved, and therefore the fluid that is made to flow through the orifice passage. There is also an advantage that the anti-vibration effect based on the flow action of can be effectively obtained.

Further, according to the present invention related to a fluid-filled tubular mount device according to a second aspect of the invention, the first vulcanization molded article is inclined on the outer peripheral surface with respect to the second radial direction line. The surfaces facing the second pocket portion side are the second radial lines on the mutually parallel inclined surfaces of the inner wall surfaces of the openings of the first and second pocket portions and the back surface of the tip end portion of the umbrella member. It is also characterized by having an inclination angle equal to or greater than the inclination angle with respect to.

By adopting such a structure, the occurrence of a small undercut can be completely prevented, and the main rubber elastic body can be molded more stably. That is, in the present invention according to claim 1, even if there is a small undercut, the mold can be opened based on the elastic deformation of the main rubber elastic body and the like, which does not cause a big trouble, By adopting the configuration of the present invention as set forth in claim 2, the occurrence of undercut can be completely prevented, and a smoother mold opening operation can be realized.

The present invention relating to a fluid-filled tubular mount device according to a third aspect of the present invention is the integral vulcanization molded product, wherein the second pocket portion side located on the first radial line is located. Straight lines drawn from the apexes of the outer peripheral surface of the seal rubber layer to the respective inner wall surfaces of the openings of the first and second pocket portions and the inclined surfaces parallel to each other on the back surface of the tip end portion of the umbrella member are parallel to each other. It is also a feature that the angles of the mutually parallel inclined surfaces are set so as not to pass a point having a depth of 60% or more of the wall thickness.

If such a construction is adopted, the seal rubber layer formed on the outer peripheral surface of the intermediate sleeve does not get caught to the extent that it hinders mold opening, and is within the allowable range of elastic deformation of the seal rubber layer itself. Since the mold opening along the inclined surface of the molding die is allowed based on the elastic deformation of the seal rubber layer, the mold opening can be smoothly performed, and damage to the seal rubber layer is effectively prevented. obtain.

Further, a feature of the present invention relating to a method of manufacturing a fluid-filled type cylindrical mount device is as follows.
In manufacturing the fluid-filled type cylindrical mount device having the structure according to the present invention described in (3) above, a mold matching surface is provided on the first radial line, and the inner wall surfaces of the openings of the first and second pockets are formed. And, the integral vulcanization molded article is formed by using a two-divided molding die in which the molds are opened toward each other in the directions of the inclined surfaces parallel to each other on the back surface of the tip end portion of the umbrella member.

According to the method of the present invention as described above, an undercut is avoided by using a molding die having a laterally open mold splitting structure having a mold matching surface on the first radial line extending in the main vibration input direction. At the same time, it is advantageous to form a main body rubber elastic body having a pair of support arm portions inclined so as to spread toward the first pocket portion side, as an integrally vulcanized molded article integrally provided with an umbrella member. Therefore, it is possible to manufacture a fluid-filled cylindrical mount device having excellent durability with excellent manufacturability and cost.

[0020]

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

First, FIGS. 1 and 2 show an FF type engine mount 10 for an automobile as an embodiment of the present invention. In this engine mount 10, an inner cylindrical metal member 12 as a shaft member and an outer cylindrical metal member 14 as an outer cylindrical member are arranged at a predetermined distance in the radial direction and eccentric by a predetermined amount. The inner cylindrical metal fitting 12 and the outer cylindrical metal fitting 14 are connected to each other by a main body rubber elastic body 16 interposed between the power unit and the body (not shown), thereby protecting the power unit from the body. It is designed to support shaking. In addition, under the mounted state of the engine mount 10,
The weight of the power unit is exerted in a substantially vertical direction in FIGS. 1 and 2 and the main rubber elastic body 16 is elastically deformed, so that the inner tubular metal fitting 12 and the outer tubular metal fitting 14 are positioned on substantially the same axis. The main vibration load is input in a direction substantially the same as the input direction of the power unit weight.

More specifically, the inner tubular member 12 has a thick-walled cylindrical shape, and an acting member 1 formed on the outer peripheral surface of the inner tubular member 12 by a hard material such as fiber reinforced resin or metal.
8 is fixed. This acting member 18 is the inner tube fitting 1
2 has a substantially mushroom-shaped umbrella portion 20 that protrudes radially outward in the axial center portion and has a tip end portion that expands like an umbrella, and a diameter that is opposite to the umbrella portion 20 in both axial direction side portions of the inner tubular metal member 12. The stopper portions 22 and 22 each having a substantially rectangular block shape projecting outward in the direction are integrally provided.

Further, a metal sleeve 24 as an intermediate sleeve is eccentrically arranged at a predetermined distance in the radial direction and outwardly in the radial direction of the inner cylindrical metal member 12 to which the above-mentioned action member 18 is fixed. The inner cylindrical metal fitting 12 is arranged so as to surround the inner metal fitting 12. The metal sleeve 24 has a large-diameter, thin-walled cylindrical shape as a whole, and has a substantially rectangular first window portion 26 extending in the circumferential direction at a length of less than a half circumference in the axial center portion. The second window portion 28 is formed so as to be opposed to one another in the radial direction. In addition, in the metal sleeve 24, the first window portion 26 and the second window portion 28
The connecting portions 30, 30 located between the both ends in the circumferential direction are slightly recessed inward in the axial center portion, whereby the first window portion 26 and the second window portion 28 are formed. Wide circumferential grooves 32, 32 are formed so as to extend across both circumferential edge portions. That is, in the metal sleeve 24, the pair of annular plate-shaped portions 34, 34, which are opposed to each other on the same axis with a predetermined distance in the axial direction, are integrally connected by the pair of connecting portions 30, 30. It is a structure.

Further, the inner tubular member 12 and the metal sleeve 24
A main rubber elastic body 16 is interposed between the two. As shown in FIGS. 3 to 5, the main rubber elastic body 16 has a thick-walled cylindrical shape as a whole, the inner cylindrical metal member 12 is provided on the inner peripheral surface thereof, and the metal sleeve 24 is provided on the outer peripheral surface thereof. Are formed as an integrally vulcanized molded product 36 that is vulcanized and adhered. Further, a seal rubber layer 38 is formed and vulcanized and adhered on the outer peripheral surface of the metal sleeve 24 over substantially the entire surface thereof, and the seal rubber layer 38 is also adhered to the peripheral groove 32 of each connecting portion 30.
Is thick and filled. The seal rubber layer 38 is formed integrally with the main rubber elastic body 16.

Further, the main body rubber elastic body 16 has a first side on the one side in the eccentric direction of the inner tubular member 12 and the metal sleeve 24 (the side on which the separation distance in the eccentric direction is large, that is, the upper side in FIG. 3). The pocket portion 42 is provided, and is opened to the outer peripheral surface through the first window portion 26 of the metal sleeve 24, and the inner tubular metal fitting 12 and the metal sleeve 24 are on the other side in the eccentric direction (the separation distance in the eccentric direction). The second pocket portion 44 is provided on the smaller side (lower side in FIG. 3) and is opened to the outer peripheral surface through the second window portion 28 of the metal sleeve 24. Further, the umbrella portion 20 is provided so as to project from the center of the bottom portion inside the first pocket portion 42, and the narrowed portion 46 is provided between the outer peripheral surface of the umbrella portion 20 and the inner peripheral surface of the first pocket portion 42. Are formed.
A cover rubber layer 47 is integrally formed with the main rubber elastic body 16 and vulcanized and bonded to the umbrella portion 20 so as to cover the entire outer peripheral surface thereof. Further, the main rubber elastic body 16 forming the bottom wall portion 48 of the second pocket portion 44 is provided with a slit 49 extending axially therethrough.
The bottom wall portion 48 has a thin wall and is easily deformed.

Due to the structure of the molding die for the main rubber elastic body 16, both stopper portions 22, 22 provided on the inner tubular metal fitting 12 are provided.
Since the main body rubber elastic body 16 is filled in the space, the central portion in the circumferential direction of the second pocket portion 44 corresponding to the disposition portion of the stopper portions 22 and 22 has a shallow bottom. Further, the protruding tip surfaces of the stopper portions 22 and 22 are positioned to face the annular plate portions 34 and 34 of the metal sleeve 24 in the radial direction, respectively. Furthermore, a buffer rubber layer 50 is integrally formed with the main rubber elastic body 16 and vulcanized and bonded to the protruding tip surfaces of the stopper portions 22, 22.

Furthermore, in the circumferential groove 32 of each connecting portion 30 in the metal sleeve 24, between the opening portions of the first pocket portion 42 and the second pocket portion 44 with respect to the seal rubber layer 38 filled therein. A groove 54 extending in the circumferential direction while meandering over the ridge is formed, and the groove 54 connects both openings of the first pocket portion 42 and the second pocket portion 44. In addition, a plurality of seal lips 56 extending in the circumferential direction and the axial direction are formed on the outer peripheral surface of the seal rubber layer 38.
The opening portions of the first pocket portion 42, the second pocket portion 44, and the recessed grooves 54, 54 are surrounded by 6, respectively.

Here, as shown in FIG. 3, a first pocket portion 42 and a second pocket portion 44.
The bottom wall surfaces of the metal sleeve 24 are located adjacent to each other with the connecting portion 30 of the metal sleeve 24 sandwiched in the circumferential direction, in other words, the opening inner wall surfaces 58, 58 on both sides of the first pocket portion 42 in the circumferential direction and the second inner wall surface. Inner wall surfaces 60, 60 on both sides in the circumferential direction of the pocket portion 44 are parallel to each other. In addition, these opening inner wall surfaces 58, 58 and 60, 60
Are located on both sides of the first radial line: X, which is the facing direction of the first pocket part 42 and the second pocket part 44, with respect to the first radial line: X. It has a cross-sectional shape that is symmetrical to the left and right, and the first radial line: X
It has a cross-sectional shape that is inclined at an inclination angle α (α> 0) toward the first pocket portion 42 side with respect to the second radial line Y that is orthogonal to. In short, the opening inner wall surfaces 58, 58 on both sides in the circumferential direction of the first pocket portion 42 are formed to have a shape that expands outward from the central portion, and are formed on both sides in the circumferential direction of the second pocket portion 42. The opening inner wall surfaces 60, 60 are formed so as to extend parallel to the opening inner wall surfaces 58, 58 of the first pocket portion 42 in the opening direction.

Further, the umbrella portion 20 which spreads on both sides in the circumferential direction in the first pocket portion 42 is provided with the back surfaces 62, 62 on both sides in the circumferential direction which are positioned to face the circumferential inner surface walls 58, 58 of the first pocket portion 42. Have a cross-sectional shape that extends parallel to the circumferential inner wall surfaces 58 of the first pocket portion 42.

As shown in FIGS. 1 and 2, the outer tubular metal fitting 14 is externally inserted into the integrally vulcanized molded product 36 having such a structure, and the metal sleeve 24 is drawn. It is fitted and fixed to. Thereby,
The outer peripheral side openings of the first pocket portion 42, the second pocket portion 44, and the recessed groove 54 are covered with the outer tubular metal fittings 14, respectively, so that part of the wall portion is constituted by the main rubber elastic body 16. The pressure receiving chamber 70, which causes fluctuations in internal pressure at the time of vibration input, and the bottom wall portion 48, which is a part of the wall portion that is easily deformable, allows the volume change to be easily allowed based on the deformation of the bottom wall portion 48. Equilibrium chamber 72, and orifice passages 74, 74 for communicating the pressure receiving chamber 70 and the equilibrium chamber 72 with each other.
Are formed respectively. The rubber plates 82 and 84 mounted on both axial sides of the inner tubular metal fitting 12 are interposed between axial contact portions of the outer tubular metal fitting 14 and other members (not shown) in the axial direction to exhibit a cushioning function. It is a member.

Further, the pressure receiving chamber 70, the equilibrium chamber 72 and the orifice passages 74, 74 are filled with incompressible fluids such as water, alkylene glycol, polyalkylene glycol, silicone oil and the like. The viscosity and the like of the enclosed fluid is not particularly limited and is appropriately determined according to the required mount vibration isolation characteristics and the like, but it does not affect the resonance action of the fluid caused to flow through the orifice passage 74. In order to obtain the vibration-damping effect based on it, a low-viscosity fluid of 0.1 Pa · s or less is preferably adopted. Further, the encapsulation of the incompressible fluid can be advantageously performed by, for example, assembling the outer tubular metal fitting 14 with respect to the integrally vulcanized molded product 36 in the fluid.

In the engine mount 10 having such a structure, as is well known, the orifice passage 74 is based on the pressure difference generated between the pressure receiving chamber 70 and the equilibrium chamber 72 at the time of vibration input. Based on the resonance action of the fluid that is made to flow through the components 74 and 74, for example, a damping effect for low-frequency vibrations such as shakes, a vibration insulating effect for medium- or high-frequency vibrations such as idling vibrations or muffled sounds, and the like are exhibited. . Further, in the engine mount 10, the umbrella portion 2 is provided inside the pressure receiving chamber 70.
0 forms an annular constriction portion 46 in which a fluid flow is generated at the time of vibration input.
The resonance action of the fluid that is caused to flow through 6 can also exert a vibration insulating effect against high-frequency vibration, for example.

Here, in the engine mount 10 as described above, the opening inner wall surface 5 of the first pocket portion 42 is provided on both sides of the first radial line X.
8 and the inner wall surface 60 of the opening in the second pocket 44
Are formed in parallel with each other and inclined toward the first pocket portion 42 side with respect to the second radial direction line: Y, so that the inner cylindrical metal member 12 is constituted by the main rubber elastic body 16. A pair of support arm portions 64, 64 extending radially from the metal sleeve 24 to the bottom wall portions on both sides in the circumferential direction of the first pocket portion 42 with respect to the second radial line Y. The pair of support arm portions 64, 64 have a large effective free length L, and the pair of support arm portions 64 due to the weight of the power unit exerted when the mount is mounted. , 6
The deformation in No. 4 is mainly a compressive deformation so that the occurrence of tensile stress can be prevented, and excellent durability and spring rigidity can be easily obtained.

Moreover, the back surface 62 of the umbrella portion 20 is also formed parallel to the opening inner wall surfaces 58, 60 of the first and second pocket portions 42, 44 on both sides of the first radial line. Therefore, as shown in FIG. 6, the forming dies 66, 68 having a laterally-opened splitting structure having a die-matching surface on the first radial line: X are adopted. , 68 with their first and second pockets 4
Inner wall surfaces 58 and 60 of the openings 2 and 44 and the umbrella portion 2
By opening the mold in the direction parallel to the back surface 62 of 0,
The desired integrated vulcanization molded product 36 can be advantageously formed with excellent manufacturability while avoiding undercutting.

In this embodiment, in particular, as shown in FIG. 3, on the outer peripheral surface of the integrally vulcanized molded product 36,
Second radial line: a surface that is inclined with respect to Y and faces the second pocket portion 44 side (in FIG. 3, the inclined surface faces downward, and the first radial line: on the right side with respect to X: Second radial line: Y
And the inclination angle α is such that α> 0), the inclination angles are the same as or larger than the inclination angles of the opening inner wall surfaces 58, 60 of the first and second pocket portions 42, 44. Has been formed. Specifically, the side wall inner surface 78 of the groove 54 and the central inclined inner surface 80 of the bottom wall portion 48 are substantially the same as the inclination angles of the opening inner wall surfaces 58 and 60 in the first and second pocket portions 42 and 44, respectively. They are formed with the same inclination angle. In short, in FIG. 3, the first radial line: X
The first and second pockets 4 are provided on both sides sandwiching the
2, 44, the inner wall surfaces 58, 60 of the opening, the rear surface 62 of the umbrella portion 20, the central inclined inner surface 80 of the bottom wall portion 48, and the concave groove 5
Since the respective directions A, B, C, D, E of the side wall inner surface 78 of No. 4 are made parallel to each other, small undercuts are thereby avoided,
Even better manufacturability is demonstrated.

By the way, the first and second pocket portions 4
The inclination angles α of the inner wall surfaces 58, 60 of the openings 2 and 44, etc., should be appropriately set in consideration of the magnitude of the input load, required mount characteristics, etc., but as shown in FIG. In the integrally vulcanized molded product 36, a straight line drawn in the mold opening direction from a vertex: P located on the mold matching surface of the seal rubber layer 38 on the second pocket portion 44 side: Z
However, it is desirable to set such an inclination angle α so as not to pass through a point having a depth of 60% or more of the thickness of the seal rubber layer 38. More specifically, in FIG. 7, it is desirable to set the value of the following expression (b / (a + b)) × 100 so that it does not exceed 60 or more. With this setting, it is possible to prevent the seal rubber layer 38 provided on the outer peripheral surface of the metal sleeve 24 from being unduly stressed when the mold is opened, and the seal rubber layer 38 itself is deformed so that the mold can be opened. This is easily acceptable, and it is possible to further improve manufacturability and reduce the defective product rate.

Further, in the engine mount 10 as described above, since the main rubber elastic body 16 is formed by the molding dies 66 and 68 having the mating surfaces on the first radial line: X, the mating surfaces are The concave groove 54 is not constricted or blocked by the rubber burr generated above, and the concave groove 54 having the desired shape, and thus the orifice passage 74.
Is stably formed, and the orifice passage 74 is formed.
The vibration damping effect based on the resonance action of the fluid that is made to flow can be effectively and stably exhibited.

The embodiments of the present invention have been described in detail above, but these are literal examples and the present invention should not be construed as being limited to such specific examples.

For example, the concave groove forming the orifice passage may be formed on the outer peripheral surface of the intermediate sleeve between the openings of the first pocket portion and the second pocket portion. The specific shape, length, etc. are appropriately changed according to the anti-vibration characteristics required for the mount.

Further, two second pocket portions are formed independently of each other on the side opposite to the first pocket portion with the shaft member sandwiched in the main vibration input direction, and the two second pocket portions are formed in the circumferential direction in the intermediate sleeve. 2 provided at a predetermined distance from each other
It is also possible to form two equilibrium chambers independently by opening them on the outer peripheral surface through two opening windows. Furthermore, the orifice passages that connect these equilibrium chambers to the pressure receiving chamber are tuned so that they are different from each other. At the very least, it is possible to exhibit the vibration damping effect against the input vibration in a plurality of frequency ranges.

Further, in the above-mentioned embodiment, a specific example of the present invention applied to an automobile engine mount is shown. However, the present invention is not limited to this, and may be applied to automobile body mounts, differential mounts, or fluids in various devices other than automobiles. Any of them can be advantageously applied to the enclosed cylindrical mount device.

Although not listed one by one, the present invention is
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.
It goes without saying that both are included within the scope of the present invention.

[0043]

As is apparent from the above description, in the fluid-filled cylindrical mount device having the structure according to the present invention, the die-matching surface is located on the line facing the first pocket portion and the second pocket portion. Using a two-division molding die having, a pair of support arms forming the bottom wall portions on both sides in the circumferential direction of the first pocket portion are formed to be inclined so as to expand toward the first pocket portion side. The main rubber elastic body can be advantageously formed, and excellent durability in which tensile stress is prevented from occurring in the main rubber elastic body is exhibited.

In addition, the umbrella member forming the narrowed flow path in the pressure receiving chamber is provided with the inner tubular metal fitting 1 before the main body elastic body is molded.
Since it is possible to integrally form it with respect to 2, and it is not necessary to attach the umbrella member as a separate member afterwards, simplification of the structure can be advantageously achieved.

Further, according to the method of the present invention, a fluid-filled cylindrical mount device having a structure according to the present invention, which has a simple structure and can exhibit excellent durability, is formed by using a mold having a laterally divided structure. It can be easily manufactured.

[Brief description of drawings]

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

FIG. 2 is a longitudinal sectional view of the engine mount shown in FIG.

FIG. 3 is a cross-sectional view showing an integrally vulcanized molded product that constitutes the engine mount shown in FIG. 1.

4 is a longitudinal sectional view of the integrally vulcanized molded product shown in FIG.

5 is a right side view of FIG.

FIG. 6 is an explanatory diagram for explaining a manufacturing process of the integrally vulcanized molded product shown in FIG.

FIG. 7 is an explanatory diagram for explaining the angle setting of the inclined surface in the integrally vulcanized molded product shown in FIG.

[Explanation of symbols]

 10 Engine Mount 12 Inner Cylinder Metal Fitting 14 Outer Cylinder Metal Fitting 16 Main Body Rubber Elastic Body 20 Umbrella 24 Metal Sleeve 26 First Window 28 Second Window 30 Coupling 36 Integrated Vulcanized Product 38 Seal Rubber Layer 42 First Pocket part 44 Second pocket part 46 Constriction part 48 Bottom wall part 54 Recessed groove 58 Opening inner wall surface (first pocket part) 60 Opening inner wall surface (second pocket part) 62 Back surface (umbrella part) 66, 68 Type 70 Pressure receiving chamber 72 Equilibrium chamber 74 Orifice passage

Claims (4)

[Claims] 1. A main body rubber elastic body is interposed between a shaft member and an intermediate sleeve disposed outside the shaft member at a predetermined distance, and the main body rubber elastic body is added to the shaft member and the intermediate sleeve. On the other hand, a plurality of opening windows are formed on the intermediate sleeve while the first and second pockets are formed on both sides in the radial direction of the main rubber elastic body sandwiching the shaft member in the main vibration input direction. Parts are provided so that they are opened to the outer peripheral surface through the opening windows of the intermediate sleeve,
Further, an umbrella member is provided which protrudes from the shaft member into the first pocket portion and has a tip end portion which expands like an umbrella and narrows the inside of the first pocket portion, and the bottom wall portion of the second pocket portion is axially arranged. While forming a slit that extends through to form a bottom wall portion of the second pocket portion as a thin rubber film that is easily deformed,
A seal rubber layer is provided on the outer peripheral surface of the intermediate sleeve, and a groove extending in the circumferential direction across the outer peripheral surface of the intermediate sleeve between both openings of the first pocket portion and the second pocket portion. The integral vulcanization molded product formed by the seal rubber layer is fitted with and fixed to the intermediate sleeve by inserting the outer tubular member into the integrally molded vulcanization molded article. The opening of the pocket portion is covered to form a pressure receiving chamber into which the incompressible fluid is enclosed and a vibration is input, and a variable volume equilibrium chamber, and the opening of the groove is formed by the outer cylinder member. A fluid-filled cylindrical mount device in which an orifice passage that covers the pressure receiving chamber and the equilibrium chamber is formed by being covered with the first pocket portion and the second pocket portion that are adjacent to each other in the circumferential direction. Within each opening The wall surface and the rear surface of the tip end portion that spreads in an umbrella shape in the umbrella member are respectively orthogonal to the first radial direction line at both side portions sandwiching the first radial direction line extending in the main vibration input direction. A fluid-filled tubular mount device, characterized in that they are inclined surfaces parallel to each other and inclined toward the first pocket portion side with respect to a second radial line. 2. On the outer peripheral surface of the integrally vulcanized molded product, a surface that is inclined with respect to the second radial direction line and faces the second pocket portion side is the first and second surfaces. 2. An inclination angle greater than or equal to the inclination angle with respect to the second radial line on the inner wall surface of each opening of the second pocket portion and the mutually parallel inclined surfaces of the back surface of the tip end portion of the umbrella member.
The fluid-filled tubular mounting device according to [4]. 3. In the integrally vulcanized molded product, the first and second pocket portions are located from the apex of the outer peripheral surface of the seal rubber layer on the second pocket portion side located on the first radial line. The straight lines drawn in parallel to the inner wall surfaces of the openings and the inclined surfaces parallel to each other on the back surface of the tip end of the umbrella member do not pass through a point having a depth of 60% or more of the thickness of the seal rubber layer. The fluid-filled cylindrical mount device according to claim 1 or 2, wherein angles of inclined surfaces parallel to each other are set. 4. When manufacturing the fluid-filled cylindrical mount device according to claim 1, a mold fitting surface is provided on the first radial direction line, and inside each opening of the first and second pocket parts. Fluid-encapsulation characterized in that the integrally vulcanized molded product is formed by using a two-divided molding die which is opened toward each other in the directions of the inclined surfaces parallel to each other on the wall surface and the back surface of the tip end portion of the umbrella member. Method of manufacturing a tubular mount device.