JP2015031308A - Vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration isolator which facilitates axial positioning of an intermediate sleeve etc. relative to an external cylinder and improves the durability by reducing stress applied to a seal rubber layer.SOLUTION: The vibration isolator includes: a body rubber elastic body 16 which elastically connects an interior cylinder 12 with an intermediate sleeve 18; an external cylinder 14 into which the intermediate sleeve 18 is inserted; and a seal rubber layer 22 disposed on an inner peripheral surface of the external cylinder 14. Protruding parts 44 protruding toward the interior cylinder 12 side are provided at an upper part of the seal rubber layer 22. An upper end surface 18a of the intermediate sleeve 18 is in contact with the protruding parts 44.

Description

  The present invention relates to a vibration isolator.

  As a vibration isolator, an automobile suspension member mount is known. The suspension member mount includes an inner cylinder, an intermediate sleeve spaced apart on the outer diameter side of the inner cylinder, a main rubber elastic body that elastically connects the inner cylinder and the intermediate sleeve, and an outer sleeve. It is comprised from the outer cylinder inserted (for example, refer patent document 1).

  The inner cylinder and the intermediate sleeve are configured as an integrated vulcanization molded product in which the main rubber elastic body is vulcanized and bonded. A set of orifice forming members is attached to the vulcanized molded product. The suspension member mount is completed by inserting the vulcanized molded product equipped with the orifice forming member from above into the outer cylinder having the inner wall provided with the seal rubber layer.

Japanese Patent No. 4367324

  By the way, the suspension member mount disclosed in Patent Document 1 is such that when the inner cylinder and the intermediate sleeve are assembled to the outer cylinder, the lower end surface of the intermediate sleeve is brought into contact with the inner flange, thereby The rubber elastic body and the intermediate sleeve are positioned in the axial direction.

  In the suspension member mount disclosed in Patent Document 1, since the intermediate sleeve is a portion that constantly receives stress in the axial direction and radial direction from the inner cylinder side, a thin seal rubber layer formed inside the outer cylinder On the other hand, the stress applied from the lower end of the intermediate sleeve increases, and the durability may be reduced.

  The present invention has been made in view of the above points, and it is possible to easily perform axial positioning of the intermediate sleeve and the like with respect to the outer cylinder, and to reduce the stress on the seal rubber layer and improve durability. An object of the present invention is to provide a simple vibration isolator.

  In order to achieve the above object, the present invention provides an inner cylinder, an intermediate sleeve disposed outside the inner cylinder, and the inner cylinder and the intermediate cylinder interposed between the inner cylinder and the intermediate sleeve. A main rubber elastic body that elastically connects the intermediate sleeve; an outer cylinder that is disposed outside the intermediate sleeve; and a seal rubber layer that is disposed on an inner peripheral surface of the outer cylinder; The upper portion is provided with a protruding portion that protrudes toward the inner cylinder side, and the upper end surface of the intermediate sleeve is in contact with the protruding portion.

  In the present invention, when the intermediate sleeve or the like is assembled to the outer cylinder, the intermediate sleeve or the like is positioned in the axial direction by the protruding portion made of rubber. Therefore, in the present invention, the positioning of the intermediate sleeve or the like in the axial direction can be easily performed at the time of assembly without forming a positioning flange on the outer cylinder. As a result, in the present invention, it is not necessary to provide the inner flange at the lower end of the outer cylinder as in the prior art, and the stress applied to the seal rubber layer by the lower end of the intermediate sleeve is reduced to improve the durability. Can do. Note that at least one or more protrusions may be provided.

  Further, the protrusion is preferably provided at a position close to the rubber inlet of the mold for molding the seal rubber layer. If it does in this way, a projection part can be simply manufactured using the rubber injection hole of a metallic mold.

  Furthermore, the stopper part, the protrusion part, and the seal rubber layer provided on the upper surface of the outer flange part of the outer cylinder may be formed integrally. By forming these integrally, the assembling work is facilitated and the manufacturing cost can be reduced.

    Furthermore, the upper surface of the protruding portion may be positioned above the upper surface of the outer flange portion of the outer cylinder. If it does in this way, the thickness dimension of the protrusion part along the axial direction of an outer cylinder will increase, and durability as a positioning part can be improved.

  According to the present invention, it is possible to obtain a vibration isolator capable of easily positioning the intermediate sleeve or the like with respect to the outer cylinder in the axial direction and reducing the stress on the seal rubber layer to improve the durability.

1 is a schematic plan view showing a state in which a liquid ring type vibration isolator according to an embodiment of the present invention is applied to a suspension of a vehicle. It is a top view of the liquid seal type vibration isolator shown in FIG. FIG. 3 is an axial cross-sectional view along the line AA in FIG. 2. FIG. 3 is an axial sectional view taken along line BB in FIG. 2. FIG. 5 is a cross-sectional view taken along the line CC in FIG. 4 in the direction perpendicular to the axis. It is a partial expanded sectional view of the D section shown in FIG. It is a partial expanded sectional view of the E section shown in FIG. (A)-(d) is explanatory drawing which shows the assembly | attachment process of the liquid seal type vibration isolator which concerns on embodiment of this invention. It is a longitudinal cross-sectional view which shows the state by which the outer cylinder was set in the cavity of a metal mold | die.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, a liquid ring type vibration isolator 10 according to an embodiment of the present invention connects a lower arm 2 and a vehicle body frame 3 that constitute a suspension 1 of a left rear wheel of an automobile, and a lower arm 2. It consists of the bush which pivotally supports the shaft part 4 of this. In FIG. 1, reference numeral 5 denotes a tire, reference numeral 6 denotes a ball joint, and reference numerals 7 and 8 denote vehicle body side support members. Further, the vertical direction in the present embodiment does not coincide with the mounting state of the liquid ring type vibration isolator 10 shown in FIG. 1 with respect to the suspension 1, but refers to the vertical direction on the drawing of FIG.

  3 and 4, the liquid ring type vibration isolator 10 includes an inner cylinder 12, an outer cylinder 14, a main rubber elastic body 16, an intermediate sleeve 18, a pair of orifice forming members 20 and 20 (see FIG. 4). ) And the seal rubber layer 22. A unit in which the inner cylinder 12, the main rubber elastic body 16, the intermediate sleeve 18, and the pair of orifice forming members 20, 20 are assembled together is referred to as an inner cylinder assembly, and the unit is formed from the outer cylinder 14 and the seal rubber layer 22. May be referred to as an outer cylinder side assembly.

  The inner cylinder 12 is formed of a cylindrical body in which a through hole 24 is formed along the axial direction. The outer diameter dimension and inner diameter dimension of the inner cylinder 12 are set to be constant from one end to the other end along the axial direction.

  The outer cylinder 14 is disposed outside the inner cylinder 12 and is formed of a cylindrical body formed thinner than the inner cylinder 12. A through hole 26 is formed in the outer cylinder 14 along the axial direction. An outer flange portion 28 is provided at the upper end portion (end portion on one axial side) of the outer cylinder 14. The outer flange portion 28 is bent outward in a direction substantially perpendicular to the central axis of the inner cylinder 12 and extends by a predetermined length outward in the radial direction.

  An annular recess 30 having a circular arc cross section is formed over the entire circumference of the outer cylinder 14 at a bent portion (root portion) on the outer surface side of the outer flange portion 28. The annular recess 30 is reduced in diameter toward the inner cylinder 12 as compared with other cylindrical portions of the outer cylinder 14. In addition, the dimension (axial direction length) along the axial direction of the outer cylinder 14 is shorter than the dimension (axial direction length) along the axial direction of the inner cylinder 12 by a predetermined length (see FIG. 3 and FIG. 3). (See FIG. 4).

  As shown in FIG. 3, the main rubber elastic body 16 is interposed between the inner cylinder 12 and the intermediate sleeve 18 and elastically connects the inner cylinder 12 and the intermediate sleeve 18. The inner peripheral surface of the main rubber elastic body 16 is vulcanized and bonded to the outer peripheral surface of the inner cylinder 12, and the outer peripheral surface of the main rubber elastic body 16 is vulcanized and bonded to the inner peripheral surface of the intermediate sleeve 18. The main rubber elastic body 16 is formed, for example, by injecting molten rubber between the inner cylinder 12 set in a mold (not shown) and the intermediate sleeve 18.

  The intermediate sleeve 18 is disposed at a position spaced a predetermined distance outward in the radial direction of the inner cylinder 12, and is connected to the inner cylinder 12 via the main rubber elastic body 16. As shown in FIG. 3, the intermediate sleeve 18 includes an upper ring portion 32a, a lower ring portion 32b, and a pair of connecting portions 34 and 34 that connect the upper ring portion 32a and the lower ring portion 32b. Have.

  The upper ring portion 32a and the lower ring portion 32b are each formed in a continuous cylindrical shape over the entire circumference of the inner peripheral surface of the seal rubber layer 22, and are provided with a recessed portion or a protruding portion in a direction perpendicular to the axis. It is not done.

  The upper ring portion 32a and the lower ring portion 32b are connected by a pair of connecting portions 34 and 34. The pair of connecting portions 34, 34 extend along the axial direction of the inner cylinder 12 and are arranged to face each other. A pair of rectangular windows 40, 40 facing each other are formed by the lower end surface of the upper ring portion 32a, the upper end surface of the lower ring portion 32b, and the side surfaces of the pair of connecting portions 34, 34 (see FIG. 4).

  The seal rubber layer 22 is continuously formed to be thin along the inner peripheral surface of the outer cylinder 14 and is vulcanized and bonded to the inner peripheral surface of the outer cylinder 14. In the present embodiment, the “seal rubber layer” refers to a thin rubber portion that is interposed between the outer peripheral surface of the intermediate sleeve 18 and the inner peripheral surface of the outer cylinder 14 and seals between the two.

  Above the seal rubber layer 22, a thick stopper portion 42 is provided. The stopper portion 42 is located on the upper surface of the outer flange portion 28 and is provided over the entire circumference of the upper surface of the outer flange portion.

  As shown in FIG. 3, a protruding portion 44 is provided on the inner side of the annular recess 30 of the outer cylinder 14 and on the upper side of the sealing rubber layer 22 so as to protrude toward the inner cylinder 12 (in the radial direction). The projecting portion 44 projects inwardly in the direction perpendicular to the axis (on the inner cylinder 12 side) and has a substantially triangular shape in plan view (see FIG. 2). The upper surface 44 a of the protruding portion 44 is located at a position that is one step lower than the upper surface of the stopper portion 42. The protruding portion 44 is integrally formed across the stopper portion 42 and the seal rubber layer 22 from the upper surface 44a to the lower surface 44b. Thus, by integrally forming the protruding portion 44, the stopper portion 42, and the seal rubber layer 22, the assembling work can be facilitated and the manufacturing cost can be reduced. As shown in FIG. 2, four protrusions 44 are provided at a spacing angle of about 90 degrees along the circumferential direction of the stopper portion 42. In the present embodiment, the four protrusions 44 are illustrated as an example, but the present invention is not limited to this, and at least one or more may be provided.

  Each protrusion 44 has a substantially triangular shape having a vertex on the inner diameter side of the intermediate sleeve 18 in plan view (see FIG. 2), and is formed in a substantially rectangular shape in side view (see FIG. 3). That is, each protrusion 44 has a triangular prism shape. As shown in FIG. 6, the upper surface 44a of each protrusion 44 is set higher than the upper surface of the outer flange portion 28, and the lower surface 44b of each protrusion 44 is connected to the upper end surface 18a (upper ring portion 32a) of the intermediate sleeve 18. The upper end surface of Since the upper surface 44a of each projecting portion 44 is positioned above the upper surface of the outer flange portion 28 of the outer cylinder 14, the thickness dimension of the projecting portion 44 along the axial direction of the outer cylinder 14 is increased, thereby serving as a positioning portion. Durability can be improved.

  As shown in FIGS. 4 and 5, a pair of fluid chambers 48, 48 sealed by the main rubber elastic body 16 and the seal rubber layer 22 are opposed between the inner cylinder 12 and the outer cylinder 14. Provided. An incompressible fluid is sealed in the pair of fluid chambers 48 and 48.

  A pair of insertion recesses 50, 50 that extend along the circumferential direction and constitute a part of the fluid chamber 48 are formed in the intermediate portion in the axial direction of the main rubber elastic body 16. A pair of orifice forming members 20, 20 are attached to the pair of insertion recesses 50, 50.

  The pair of orifice forming members 20 and 20 are made of a resin material and have the same shape. One fluid chamber 48 and the other fluid chamber 48 communicate with each other via a pair of orifice forming members 20 and 20 and a communication passage 68 formed in the main rubber elastic body 16 (see FIG. 5). The incompressible fluid sealed in the pair of fluid chambers 48 and 48 is provided to be able to flow between the pair of fluid chambers 48 and 48 via the pair of orifice forming members 20 and 20.

  The liquid ring type vibration isolator 10 according to the present embodiment is basically configured as described above, and the operation and effects thereof will be described next.

  When vibration (load) in the direction perpendicular to the axis is applied from the tire 4 to the liquid seal type vibration isolator 10 via the lower arm 2, the main rubber elastic body 16 is elastically deformed. Due to this elastic deformation, a differential pressure (hydraulic pressure difference) is generated between the one fluid chamber 48 and the other fluid chamber 48, and the non-illustrated non-illustrated orifice passage is formed between the one fluid chamber 48 and the other fluid chamber 48. A compressible fluid flows. A resonance action is generated by the flow of the orifice passage of the incompressible fluid, and the vibration isolation effect is exhibited based on the resonance action. That is, when the incompressible fluid flows through the orifice passage, a damping action is generated and the vibration is absorbed. At the same time, an anti-vibration effect is generated based on the spring characteristics of the main rubber elastic body 16. An anti-vibration effect in which the anti-vibration effect due to the spring characteristics and the anti-vibration effect due to the resonance action are combined is obtained.

  Next, the assembly process of the liquid ring type vibration isolator 10 according to the present embodiment will be described with reference to FIGS. First, an end portion along the axial direction of the cylindrical body is bent to form the outer flange portion 28 on the outer cylinder 14 and the root portion of the outer flange portion 28 is drawn to reduce the diameter of the annular recess 30. Is formed (see FIG. 8A). As shown in FIG. 9, the outer cylinder 14 in which the outer flange portion 28 and the annular recess 30 are formed is set in the cavity of the mold 50. The mold 50 includes an upper mold 52 having a rubber injection port 46, a lower mold 54, and a core 56 disposed in the cavity. Molten rubber is injected into the cavity from the rubber injection port 46 of the mold 50 to integrally form the seal rubber layer 22, the stopper portion 42, the protruding portion 44, and the like (see FIG. 8B). The seal rubber layer 22 is vulcanized and bonded to the inner peripheral surface of the outer cylinder 14. In this way, the outer cylinder side assembly including the outer cylinder 14 is configured. In addition, it arrange | positions so that the position (refer FIG. 9) of the rubber injection port 46 for inject | pouring molten rubber into the cavity of the metal mold | die 50 and the position (refer FIG.8 (b)) of the protrusion part 44 may correspond. . That is, the four protrusions 44 are provided at positions close to the four rubber injection ports 46 provided in the mold 50. By using the rubber inlet 46 of the mold 50, the protruding portion 44 can be easily manufactured. The pin-shaped molten rubber 48 injected from the rubber injection port 46 of the mold 50 and solidified at the portion from the upper surface 44a of the protrusion 44 to the rubber injection port 46 is removed by finishing (FIG. 8 (c). )reference).

  Subsequently, by injecting molten rubber between the inner cylinder 12 and the intermediate sleeve 18 set in another mold (not shown), the main body is formed on the outer peripheral surface of the inner cylinder 12 and the inner peripheral surface of the intermediate sleeve 18. A vulcanized molded product to which the rubber elastic body 16 is vulcanized and bonded is manufactured. Further, a pair of orifice forming members 20 and 20 that are separately manufactured in advance by resin molding are assembled into the fitting recess 50 of the main rubber elastic body 16 of the vulcanized molded product. Thus, the inner cylinder side assembly including the inner cylinder 12, the intermediate sleeve 18, the main rubber elastic body 16, and the orifice forming member 20 is configured.

  Next, the outer cylinder side assembly and the inner cylinder side assembly are relatively displaced along the axial direction, and the outer cylinder 14 in which the seal rubber layer 22 is vulcanized and bonded to the inner peripheral surface is attached to the inner cylinder side assembly from the lower side. The outer cylinder side assembly and the inner cylinder side assembly are integrally fitted (see FIG. 8C). When the outer cylinder side assembly is inserted into the inner cylinder side assembly, the lower surface 44b of the protrusion 44 provided on the seal rubber layer 22 of the outer cylinder side assembly contacts the upper end surface 18a of the intermediate sleeve 18 of the inner cylinder side assembly. As a result, the intermediate sleeve 18 is positioned in the axial direction. As a result, in the present embodiment, the axial positioning of the outer cylinder side assembly and the inner cylinder side assembly can be easily performed.

  The assembly of the outer cylinder side assembly and the inner cylinder side assembly is performed in a fluid filled with an incompressible fluid, so that the incompressible fluid is enclosed in the pair of fluid chambers 48 and 48 simultaneously with the assembly operation. The Further, in the fluid, for example, the outer peripheral surface of the outer cylinder 14 is crimped over the entire circumference using a crimping jig (not shown) (see arrow F1), and the lower end portion of the outer cylinder 14 is crimped over the entire circumference (see FIG. (See arrow F2) (see FIG. 8D).

  In this embodiment, when the outer cylinder side assembly (the outer cylinder 14 and the seal rubber layer 22) and the inner cylinder side assembly (the inner cylinder 12, the intermediate sleeve 18 and the main rubber elastic body 16) are assembled, for example, the outer cylinder side When the assembly is extrapolated from the inner cylinder side assembly, the projecting portion 44 provided on the seal rubber layer 22 of the outer cylinder side assembly comes into contact with the upper end surface 18a of the intermediate sleeve 18 of the inner cylinder side assembly so that the intermediate sleeve 18 Are positioned in the axial direction. As a result, in the present embodiment, the axial positioning of the outer cylinder side assembly and the inner cylinder side assembly can be easily performed.

  In the present embodiment, the protrusion 44 is provided at a position close to the rubber injection port 46 for injecting molten rubber into the cavity of the mold 50, so that the rubber injection port 46 of the mold 50 is used. The protrusion 44 can be easily manufactured.

  Further, in the present embodiment, it is not necessary to provide an inner flange as in the prior art at the lower end portion of the outer cylinder 14, and the stress applied to the seal rubber layer 22 by the lower end portion of the intermediate sleeve 18 is reduced to improve durability. Can be improved.

DESCRIPTION OF SYMBOLS 10 Liquid seal type vibration isolator 12 Inner cylinder 14 Outer cylinder 16 Main body rubber elastic body 18 Intermediate sleeve 18a Upper end surface 22 Seal rubber layer 28 Outer flange part 42 Stopper part 44 Projection part 46 Rubber injection port 50 Mold

Claims (5)

An inner cylinder,
An intermediate sleeve disposed outside the inner cylinder;
A main rubber elastic body interposed between the inner cylinder and the intermediate sleeve to elastically connect the inner cylinder and the intermediate sleeve;
An outer cylinder disposed outside the intermediate sleeve;
A seal rubber layer disposed on the inner peripheral surface of the outer cylinder;
With
On the upper part of the seal rubber layer, a protruding portion that protrudes toward the inner cylinder side is provided,
The anti-vibration device according to claim 1, wherein an upper end surface of the intermediate sleeve is in contact with the protruding portion. The vibration isolator according to claim 1, wherein
The anti-vibration device according to claim 1, wherein the protrusion is provided at a position close to a rubber injection port of a mold for forming the seal rubber layer. In the vibration isolator according to claim 1 or 2,
At least one or more protrusions are provided. In the vibration isolator according to any one of claims 1 to 3,
An outer flange portion is provided at one end portion along the axial direction of the outer cylinder,
A stopper portion is provided on the upper surface of the outer flange portion,
The vibration isolator, wherein the stopper portion, the protruding portion, and the seal rubber layer are integrally formed. The vibration isolator according to claim 4,
The anti-vibration device according to claim 1, wherein an upper surface of the protruding portion is located above an upper surface of the outer flange portion.

Images