JP2016044780A - Liquid-sealed vibration isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve high damping effect while setting rubber hardness of a liquid-sealed vibration isolation device to a comparatively low value.SOLUTION: A liquid-sealed vibration isolation device includes an inner cylinder 10 and an outer cylinder 20, a vibration isolation base 40 connecting the inner cylinder 10 and the outer cylinder 20 to form a liquid chamber 50, a rubber leg 43 dividing the liquid chamber 50 into a first liquid chamber 50a and a second liquid chamber 50b, and a cylindrical outer fitting member 60 externally fitted to a stopper portion 11. The inner cylinder 10 is relatively displaced to the outer cylinder 20 in a radial direction, and an inner face of the elastically deformed vibration isolation base 40 can be kept into contact with the outer fitting member 60 when the stopper portion 11 approaches an inner face of the outer cylinder 20. As an area facing the liquid chamber 50, of the inner face of the vibration isolation base 40 can be reduced for the contact with the outer fitting member 60, internal pressure of the liquid chamber 50 can make hardly escape (liquid pressure is hardly reduced). As a result, the internal pressure of the liquid chamber 50 can be increased. Thus high damping effect can be achieved while setting rubber hardness to a comparatively low value.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a liquid-filled vibration isolator, and more particularly, to a liquid-filled vibration isolator capable of obtaining a high damping effect while allowing a rubber hardness to be set to a relatively low value.

  Conventionally, various suspension members are attached to a vehicle body in order to suspend a differential device, wheels, or the like on the vehicle body of an automobile or the like. As an anti-vibration device that reduces harmful vibration while supporting and fixing the suspension member to the vehicle body, Patent Document 1 discloses an anti-vibration device in which a liquid chamber is formed by connecting the inner cylinder and the outer cylinder, and the inner cylinder and the outer cylinder. A base body, a rubber leg connected to the anti-vibration base body and dividing the liquid chamber into a first liquid chamber and a second liquid chamber, and formed on the outer peripheral surface side of the rubber leg and communicated with the first liquid chamber and the second liquid chamber. Disclosed is a liquid-filled vibration isolator having a communicating orifice. According to this liquid-filled vibration isolator, the inner cylinder is relatively displaced with respect to the outer cylinder in a predetermined radial direction (the direction in which the volume of each liquid chamber is changed), so A damping effect can be obtained by the liquid flow effect.

Japanese Unexamined Patent Publication No. 2007-93010 (for example, paragraph 0022, FIG. 1, FIG. 3 and FIG. 4)

  However, in the above-described conventional liquid-filled vibration isolator, rubber legs are formed to partition the liquid chamber, and accordingly, the rubber volume is increased and the spring constant (static spring constant or dynamic spring constant) is increased. Becomes larger. Therefore, in order to keep the spring constant below a predetermined value, it is necessary to set the rubber hardness to a relatively low value. However, when the rubber hardness is lowered, the inner cylinder is relatively displaced in the radial direction with respect to the outer cylinder, and the internal pressure of the liquid chamber easily escapes when the volume of each liquid chamber is changed. That is, since the internal pressure of the liquid chamber is difficult to increase, the liquid cannot be sufficiently flowed between the liquid chambers via the orifice, and there is a problem that the damping effect is reduced.

  The present invention has been made to solve the above-described problems, and provides a liquid-filled vibration isolator capable of obtaining a high damping effect while enabling the rubber hardness to be set to a relatively low value. It is an object.

Means for Solving the Problems and Effects of the Invention

  According to the liquid-filled vibration isolator of claim 1, the rubber hardness of the vibration isolator base and the rubber leg is set to 40 degrees or more and 65 degrees or less, so that the rubber volume is increased by the rubber legs. However, the spring constant (static spring constant or dynamic spring constant) can be suppressed to a predetermined value or less.

  In this case, according to the first aspect, the tubular outer fitting member fitted to the stopper portion is provided, the inner tube is relatively displaced in the radial direction with respect to the outer tube, and the stopper portion is formed on the inner surface or the inner surface of the outer tube. When approaching the outer surface of the cylinder, the inner surface of the vibration-damping base that is elastically deformed is formed so as to be able to contact the outer fitting member. Therefore, since the area facing the liquid chamber on the inner surface of the vibration-proof base can be reduced by the amount of contact with the outer fitting member, it is difficult for the internal pressure of the liquid chamber to escape (the liquid pressure is not easily relaxed). it can. As a result, the internal pressure of the liquid chamber can be increased. Thereby, a high damping effect can be obtained while the rubber hardness can be set to a relatively low value.

  In addition, in the state where the inner cylinder is not relatively displaced in the radial direction with respect to the outer cylinder, the vibration isolating base may be in contact with the outer fitting member. That is, when the inner cylinder is relatively displaced in the radial direction with respect to the cylinder and the stopper portion comes close to the inner surface of the outer cylinder or the outer surface of the inner cylinder, The term “abuts against” includes the state in which the anti-vibration base is in contact with the outer fitting member from the initial state.

  According to the liquid-filled vibration isolator according to claim 2, in addition to the effect exhibited by the liquid-filled vibration isolator according to claim 1, the outer fitting member is made of a material harder than the vibration-proof base, so that It can suppress that an external fitting member deform | transforms with the internal pressure of a liquid chamber. Therefore, it is difficult to escape the internal pressure of the liquid chamber (the liquid pressure is not easily relaxed), and as a result, the internal pressure of the liquid chamber can be increased. Thereby, a high damping effect can be obtained without increasing the size of the liquid-filled vibration isolator. In addition, as a material of an external fitting member, a resin material, iron, an aluminum alloy etc. are illustrated, for example.

  According to the liquid-filled vibration isolator of claim 3, in addition to the effect of the liquid-filled vibration isolator of claim 2, the outer fitting member is formed in a cylindrical shape. It is possible to easily form a state in which the outer fitting member is fitted onto the stopper portion by fitting from the protruding tip side. That is, it is possible to improve the mounting property of the outer fitting member to the stopper portion and reduce the assembly cost.

  According to the liquid-filled vibration isolator according to claim 4, in addition to the effect exhibited by the liquid-filled vibration isolator according to claim 3, the rubber-filled vibration isolator is made of a rubber-like elastic body and is covered on the outer surface of the stopper portion. Since the covering rubber portion connected to the base is provided, the external fitting member can be externally fitted to the stopper portion via the covering rubber portion. That is, since the outer fitting member can be brought into close contact with the covering rubber portion, it is possible to prevent the outer fitting member from coming out of the stopper portion.

  According to the liquid-filled vibration isolator according to claim 5, in addition to the effect exhibited by the liquid-filled vibration isolator according to claim 4, the outer fitting member includes a projecting portion projecting from the inner surface thereof. The outer fitting member can be firmly adhered to the covering rubber portion using the protruding portion. As a result, it is possible to prevent the outer fitting member from coming out of the stopper portion.

  According to the liquid-filled vibration isolator according to claim 6, in addition to the effect exerted by the liquid-filled vibration isolator according to any one of claims 3 to 5, the outer fitting member extends from the opening on one side to the other side. Since the slit part cut out in the shape of a slit is provided up to the opening, the outer fitting member can be elastically deformed in the expansion direction when the outer fitting member is fitted from the protruding front end side of the stopper part. As a result, the mounting property of the outer fitting member to the stopper portion can be improved, and the assembly cost can be reduced.

  According to the liquid-filled vibration isolator according to claim 7, in addition to the effect exhibited by the liquid-filled vibration isolator according to any of claims 3 to 6, the length dimension of the stopper portion in the protruding direction is When the outer fitting member is set to a dimension larger than the length dimension of the outer fitting member in the protruding direction and the outer fitting member is fitted to the stopper portion, the protruding tip side of the stopper portion projects from one side of the outer fitting member. When restricting the relative displacement in the radial direction between the cylinder and the outer cylinder, only the stopper portion can be brought into contact with the inner surface of the outer cylinder, and the outer fitting member can be brought into contact with the inner surface of the outer cylinder and be damaged. Can be prevented.

  According to the liquid-filled vibration isolator of claim 8, in addition to the effect exhibited by the liquid-filled vibration isolator according to any one of claims 1 to 7, the outer fitting member is connected to the inner surface of the vibration-isolating base. Since a predetermined interval is provided between them, when a relatively small amplitude vibration is input, contact between the outer fitting member and the vibration isolating base can be avoided, and the dynamic spring constant can be reduced.

  According to the liquid-filled vibration isolator according to claim 9, in addition to the effect exhibited by the liquid-filled vibration isolator according to any one of claims 1 to 8, the outer fitting member faces the inner surface of the vibration-proof base. Since the outer contact member is fitted from the protruding front end side of the stopper portion, the stopper portion is formed. It is possible to easily form a state in which the external fitting member is externally fitted. That is, it is possible to improve the mounting property of the outer fitting member to the stopper portion and reduce the assembly cost.

  In this case, when the inner cylinder is relatively displaced in the radial direction with respect to the outer cylinder and the stopper portion is brought close to the inner surface of the outer cylinder, the elastically deformed vibration-insulating base surface becomes an outer fitting member (contact portion). According to the ninth aspect of the present invention, since the edge portion on the connecting portion side of the contacting portion is formed to protrude outward from the connecting portion, the outer fitting member ( The area that contacts the contact portion) can be enlarged, and the area facing the liquid chamber can be reduced accordingly. Thereby, the internal pressure of the liquid chamber can be made difficult to escape (the liquid pressure is hardly relaxed), and the internal pressure of the liquid chamber can be increased. As a result, a high damping effect can be obtained without increasing the size of the liquid-filled vibration isolator.

(A) is a top view of the liquid sealing type vibration isolator in 1st Embodiment, (b) is sectional drawing of the liquid sealing type vibration isolator in the Ib-Ib line | wire of Fig.1 (a). (A) is sectional drawing of the liquid-filled type vibration isolator in the IIa-IIa line | wire of FIG.1 (b), (b) is a part of the liquid-filled type vibration isolator in the IIb part of Fig.2 (a) It is an enlarged view. (A) is a front view of an external fitting member, (b) is sectional drawing of the external fitting member in the IIIb-IIIb line | wire of Fig.3 (a). It is sectional drawing of a liquid enclosure type vibration isolator. (A) is a top view of the external fitting member in 2nd Embodiment, (b) is a side view of the external fitting member in the Vb-Vb line | wire of Fig.5 (a), (c) is liquid It is a partial expanded sectional view of an enclosure type vibration isolator. (A) is a perspective view of the external fitting member in 3rd Embodiment, (b) is sectional drawing of the liquid filling type vibration isolator in 4th Embodiment. (A) is an external fitting member front view in a 5th embodiment, (b) is a sectional view of an external fitting member in the VIIb-VIIb line of Drawing 7 (a), (c) is liquid enclosure It is a partial expanded sectional view of a type vibration isolator.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, a first embodiment will be described with reference to FIGS. FIG. 1A is a top view of the liquid filled type vibration isolator 100 according to the first embodiment, and FIG. 1B is a liquid ring type vibration isolator taken along the line Ib-Ib in FIG. 2A is a cross-sectional view of the liquid-filled vibration isolator 100 taken along line IIa-IIa in FIG. 1B, and FIG. 2B is a cross-sectional view of FIG. It is the elements on larger scale of the liquid enclosure type vibration isolator 100 in IIb part.

  As shown in FIGS. 1 and 2, a liquid-filled vibration isolator 100 includes a cylindrical inner cylinder 10 fixed to one of a vehicle body frame or a suspension member, and the inner cylinder 10 from the outer peripheral side (this embodiment). A cylindrical outer cylinder 20 that is concentrically surrounded and fixed to the other of the vehicle body frame or the suspension device, and a pair of cylindrical intermediate cylinders that are fitted on the inner peripheral surfaces of both axial ends of the outer cylinder 20. 30, a vibration isolating base 40 interposed between the inner cylinder 10 and the intermediate cylinder 30 by vulcanization molding, an inner cylinder 10, an outer cylinder 20, rubber legs 43, and a vibration isolating base 40. A liquid chamber 50, rubber legs 43 that divide the liquid chamber 50 into a first liquid chamber 50 a and a second liquid chamber 50 b, and an outer fitting member 60 disposed in the stopper portion 11 of the inner cylinder 10. Composed.

  The inner cylinder 10 is formed with a pair of stopper portions 11 that protrude outward in the radial direction (perpendicular to the axis) at approximately the center in the axial direction. The stopper portion 11 protrudes along the first direction (FIG. 2A, the vertical direction, for example, the vehicle longitudinal direction) or the second direction (FIG. 2B, the horizontal direction, for example, the vehicle horizontal direction).

  The stopper portion 11 is set to a protruding dimension that is spaced apart from the outer cylinder 20 by a predetermined distance, and until the protruding tip comes into contact with the inner peripheral surface of the outer cylinder 20, the radial direction of the inner cylinder 10 with respect to the outer cylinder 20. While the relative displacement to the outer cylinder 20 is allowed, the projecting tip abuts against the inner peripheral surface of the outer cylinder 20, so that the inner cylinder 10 with respect to the outer cylinder 20 moves in a predetermined radial direction (vertical direction in FIG. 2A). Relative displacement is regulated.

  In the present embodiment, the stopper portion 11 has a rectangular cross section cut along a plane perpendicular to the protruding direction. In this case, the pair of stopper portions 11 have substantially the same width dimension in the axial direction view of the inner cylinder 10 and thickness dimension in the axial perpendicular view of the inner cylinder 10. Moreover, the protrusion dimension of a pair of stopper part 11 is made substantially the same.

  A caulking portion 21 is formed on the outer cylinder 20 by folding back both ends in the axial direction inward in the radial direction. The caulking portion 21 restricts the intermediate cylinder 30 from moving out in the axial direction. A through hole is formed in the outer peripheral surface of the outer cylinder 20, and a liquid (viscous material) such as silicon oil or ethylene glycol is liquidated by a known filling method by vacuuming through the through hole. The chamber 50 is filled. The through hole is sealed with a rivet after filling with liquid.

  The intermediate cylinder 30 is disposed concentrically with the inner cylinder 10 and the outer cylinder 20, and is internally fitted in a state of being in close contact with the inner peripheral surface of the outer cylinder 20 when the outer cylinder 20 is reduced in diameter. Further, the intermediate cylinder 30 includes a connection portion 31 having a U-shaped cross section for connecting the pair of intermediate cylinders 30.

  The connecting portions 31 are located on the radially inner side of the inner peripheral surface of the outer cylinder 20 and are formed on both sides of the inner cylinder 10. Further, the connecting portion 31 is disposed with a phase difference of 90 degrees from the protruding direction of the stopper portion 11 when the inner cylinder 10 is viewed in the axial direction.

  The anti-vibration base 40 has a rubber hardness set to 40 degrees or more and 65 degrees or less, and has a predetermined thickness dimension (dimension in the left-right direction in FIG. 1B) and is formed in an annular shape when viewed in the axial direction. A pair is arranged opposite to each other with a predetermined interval in the axial direction of the inner cylinder 10 (left and right direction in FIG. 1B). A liquid chamber 50 is formed between the opposing surfaces (inner surfaces) of the pair of vibration-proof substrates 40.

  Here, in the present embodiment, the anti-vibration base body 40 is formed in a shape in which a sectional view in a plane including the axis of the inner cylinder 10 is curved in an arc shape toward the stopper portion 11 (FIG. 1B). reference). That is, the anti-vibration base 40 is curved in a convex arc shape toward the stopper portion 11 and the outer surface is curved in an arc concave toward the stopper portion 11. Therefore, when the inner cylinder 10 is relatively displaced with respect to the outer cylinder 20 in a predetermined radial direction (vertical direction in FIG. 2 (a)), the inner cylinder 10 is protected in a manner close to the outer cylinder 20. The vibration base 40 can be bent.

  The covering rubber part 42 is a rubber-like elastic body covering the outer surface of the stopper part 11, and is formed continuously with the vibration isolation base 40. The covering rubber part 42 is provided with a groove 42a on the side surface (the side surface connecting the side surfaces facing the inner surface of the vibration isolating base 40, the left and right side surfaces in FIG. 2B). The groove portion 42 a is a groove into which the protruding portion 62 a of the outer fitting member 60 is fitted, and extends linearly from the protruding end of the covering rubber portion 42 along the protruding direction of the stopper portion 11. Therefore, the insertion property of the outer fitting member 60 into the stopper portion 11 is not hindered.

  The rubber legs 43 are rubber-like elastic bodies that are vulcanized and molded integrally with the vibration isolating base 40 and the covering rubber portion 42, and the outer peripheral surface is brought into close contact with the inner peripheral surface of the outer cylinder 20 and the upper and lower vibration isolating bases 40. Are connected. Thereby, the liquid chamber 50 is divided into the first liquid chamber 50a and the second liquid chamber 50b.

  Further, the rubber legs 43 are embedded with connection portions 31 formed in the pair of intermediate cylinders 30. Since the stopper portion 11 is disposed 90 degrees out of phase with the rubber leg 43, the stopper portion 11 is disposed so as to protrude into the first liquid chamber 50a and the second liquid chamber 50b.

  A concave groove is formed in the outer peripheral surface of the rubber leg 43, and an orifice 55 is formed between the concave groove and the inner peripheral surface of the outer cylinder 20. The orifice 55 is an orifice flow path for allowing the first liquid chamber 50a and the second liquid chamber 50b to communicate with each other and allowing the liquid to flow between the two liquid chambers 50a and 50b.

  In the liquid-filled vibration isolator 100, the inner cylinder 10 is relatively displaced with respect to the outer cylinder 20 in a predetermined radial direction (the vertical direction in FIG. A damping effect can be obtained by the liquid flow effect between the two liquid chambers 50b.

  An outer fitting member 60 is disposed on the stopper portion 11. Here, the outer fitting member 60 will be described with reference to FIG.

  3A is a front view of the outer fitting member 60, and FIG. 3B is a cross-sectional view of the outer fitting member 60 taken along the line IIIb-IIIb in FIG. 3A.

  As shown in FIG. 3, the outer fitting member 60 is formed from a resin material as an annular member having a horizontally long rectangular shape when viewed from above. That is, the outer fitting member 60 includes a pair of contact portions 61 that form a long side of the top view rectangle and a pair of connection portions 62 that connect the end portions of the contact portion 61 and form a top view rectangle. It is formed as an annular (cylindrical) body having a rectangular cross section.

  A projecting portion 62 a having a rectangular cross section is projected on the inner surface of the connecting portion 62. The projecting portion 62 a is formed to be slightly wider than the groove width in the groove portion 42 a of the covering rubber portion 42. Therefore, it is possible to prevent the outer fitting member 60 from coming off from the stopper portion 11 by bringing the outer surface of the protruding portion 62a into close contact with the inner wall surface of the groove portion 42a of the covering rubber portion 42.

  Further, at both ends of the inner surface of the connecting portion 62, concave portions 60b that are curved in an arc shape when viewed from above are provided. As a result, as will be described later, when the operation of pressing the outer fitting member 60 (contact portion 61) against the stopper portion 11 by the inner surface of the vibration isolating base 40 is repeated (see FIG. 4), It is possible to improve the durability of the outer fitting member 60 by suppressing the occurrence of stress concentration at the corner (the connecting portion of the contact portion 61 and the connecting portion 62).

  Since the outer fitting member 60 is formed in an annular shape, the outer fitting member 60 can be disposed around the stopper portion 11 by being fitted from the protruding tip of the stopper portion 11. That is, the state in which the outer fitting member 60 is fitted on the stopper portion 11 can be easily formed. Therefore, the mounting property of the outer fitting member 60 to the stopper portion 11 can be improved, and the assembly cost can be reduced.

  In this case, the outer fitting member 60 is formed so that its inner shape is larger than the outer shape of the stopper portion 11 and is equal to or slightly smaller than the outer shape of the covering rubber portion 42 covered by the stopper portion 11. Specifically, the facing distance (the distance in the left-right direction in FIG. 3A) of the short side of the horizontally long rectangle when viewed from above is larger than the width dimension of the stopper portion 11 (the dimension in the left-right direction in FIG. 2B). Is equal to or slightly smaller than the outer dimension of the covering rubber part 42 in the direction, and the opposing distance (the vertical distance in FIG. 3A) of the long side of the horizontally long rectangle when viewed from above is the thickness dimension of the stopper 11 (FIG. 2B ) Larger than (right / left dimension), and equal to or slightly smaller than the outer dimension of the covering rubber portion 42 in the dimensional direction.

  Accordingly, the outer fitting member 60 can be brought into close contact with the covering rubber portion 42 and can be firmly fitted onto the stopper portion 11. Therefore, it is possible to prevent the outer fitting member 60 from coming out of the stopper portion 11.

  Returning to FIG. 1 and FIG. The outer fitting member 60 has a thickness dimension (dimension in the left-right direction in FIG. 1 (b)) of the side wall (the side wall forming the long side of the rectangle when viewed from above, see FIG. 3 (a)). It is set to a size with a predetermined interval between them. As a result, when a relatively small amplitude vibration is input, the dynamic spring constant can be reduced by avoiding contact of the inner surface of the vibration isolation base 40 with the outer fitting member 60.

  The height of the outer fitting member 60 (the vertical dimension in FIGS. 1B and 2B) is made smaller than the protruding dimension of the stopper portion 11. Thereby, in the state where the external fitting member 60 is externally fitted to the stopper portion 11, the tip of the stopper portion 11 can be protruded from the open end on one side of the external fitting member 60. As a result, when the relative displacement in the radial direction between the inner cylinder 10 and the outer cylinder 20 is restricted, only the tip of the stopper portion can be brought into contact with the inner surface of the outer cylinder 20, and the outer fitting member 60 can be used as the outer cylinder. It is possible to prevent contact with the inner surface of 20 and breakage.

  Next, the function of the external fitting member 60 will be described with reference to FIG. 4 is a cross-sectional view of the liquid-filled vibration isolator 100. From the state shown in FIG. 2A, the inner cylinder 10 moves in a predetermined radial direction with respect to the outer cylinder 20 (FIG. 2A vertical direction). A relatively displaced state is illustrated.

  As shown in FIG. 4, when the inner cylinder 10 is relatively displaced with respect to the outer cylinder 20 in a predetermined radial direction (vertical direction in FIG. 2A), the side where the inner cylinder 10 approaches the outer cylinder 20 ( In the right side of FIG. 4, the vibration-proof base 40 is elastically deformed in the compression direction between the inner cylinder 10 and the outer cylinder 20. Thereby, a part of the inner surface of the vibration isolating base 40 elastically deformed in the compression direction is brought into contact with the outer fitting member 60, and the area of the inner surface of the vibration isolating base 40 facing the liquid chamber 50 can be reduced. it can.

  Here, in the conventional liquid-filled vibration isolator, when the rubber leg 43 is formed to partition the liquid chamber 50, the rubber volume corresponding to the rubber leg 43 increases, and a spring constant (static spring constant or dynamic spring constant). ) Becomes larger. Therefore, in order to keep the spring constant below a predetermined value, it is necessary to set the rubber hardness to a relatively low value. However, when the rubber hardness is lowered, the inner cylinder 10 is displaced relative to the outer cylinder 20 in the radial direction, and the internal pressure of the liquid chamber 50 is changed when the volumes of the first liquid chamber 50a and the second liquid chamber 50b are changed. Makes it easier to escape. That is, since the internal pressure 10 of the liquid chamber 50 is difficult to increase, the liquid cannot sufficiently flow through the orifice 55 in the first liquid chamber 50a and the second liquid chamber 50b, and the damping effect is reduced.

  On the other hand, according to the present embodiment, when the inner cylinder 10 is relatively displaced with respect to the outer cylinder 20 in a predetermined radial direction (vertical direction in FIG. 2A), as described above, it is elastically deformed in the compression direction. A part of the inner surface of the anti-vibration base 40 is brought into contact with the outer fitting member 60, and the area of the inner surface of the anti-vibration base 40 facing the liquid chamber 50 can be reduced. Accordingly, the internal pressure of the liquid chamber 50 can be made difficult to escape (the liquid pressure is hardly relaxed) and the internal pressure of the liquid chamber 50 can be increased, so that the first liquid chamber 50a and the first liquid chamber 50 The liquid flowing between the two liquid chambers 50b can be increased. As a result, it is possible to obtain a high damping effect while making it possible to set the rubber hardness of the vibration isolating base 40 and the rubber legs 43 to a relatively low value.

  For example, the rubber hardness is set in the range of 40 degrees to 65 degrees by attaching the outer fitting member 60 to the conventional liquid-filled type vibration isolator in which the rubber hardness is set in the range of 45 degrees to 70 degrees. (That is, the rubber hardness can be reduced by 5 degrees), and a high damping effect can be obtained while reducing the spring constant.

  In particular, in the present embodiment, since the outer fitting member 60 is formed of a resin material harder than the vibration-isolating base 40, the outer fitting member 60 can be prevented from being deformed by the internal pressure of the liquid chamber 50. Therefore, it is difficult to escape the internal pressure of the liquid chamber 50 (the liquid pressure is not easily relaxed), and as a result, the internal pressure of the liquid chamber 50 can be increased.

  In the present embodiment, as described above, the anti-vibration base 40 is formed in a curved shape that is convex toward the stopper portion 11 (see FIG. 1B), and therefore elastic in the compression direction. The anti-vibration base 40 can be bent in such a manner that the inner surface of the deformed anti-vibration base 40 is close to the stopper portion 11 (the outer fitting member 60). As a result, the inner surface of the vibration isolating base 40 can be securely adhered to the outer surface of the outer fitting member 60. Therefore, also from this point, it is difficult to escape the internal pressure of the liquid chamber 50, and the internal pressure of the liquid chamber 50 can be reliably increased.

  Here, a shape corresponding to the outer fitting member 60 may be integrally formed with the rubber-like elastic body on the outer surface of the covering rubber portion 42 (or the inner surface of the vibration isolation base 40), and the outer fitting member 60 may be omitted. In this case, however, a space for the liquid chamber 50 is formed in a vulcanization mold for vulcanizing and molding a vulcanized molded product in which the inner cylinder 10 and the intermediate cylinder 30 are connected by the vibration-proof base 40. For this reason, the core-shaped tip portion (the portion inserted between the inner surface of the vibration isolating base 40 and the outer surface of the covering rubber portion 42) is extremely thin, which is not realistic from the viewpoint of the durability of the core type. .

  On the other hand, if the tip of the core mold is made thick, the interval between the inner surface of the vibration isolating base 40 and the outer surface of the covering rubber part 42 (corresponding to the outer fitting member 60) becomes excessive, and the inner cylinder 10 In addition, when the outer cylinder 20 is relatively displaced in a predetermined radial direction (the vertical direction in FIG. 2A), the inner surface of the vibration isolation base 40 cannot be brought into contact with the portion corresponding to the outer fitting member 60, and the internal pressure of the liquid chamber 50 Can not increase.

  On the other hand, in the present embodiment, since the outer fitting member 60 is formed as a separate part, it is possible to sufficiently ensure the interval between the vibration isolating base 40 and the outer surface of the covering rubber part 42, While ensuring the durability of the core type, after mounting the outer fitting member 60, it is possible to form a state in which the inner surface of the vibration isolating base 40 is in contact with the outer fitting member 60, thereby increasing the internal pressure of the liquid chamber 50. be able to.

  Next, a liquid-filled vibration isolator 200 according to the second embodiment will be described with reference to FIG. FIG. 5A is a top view of the outer fitting member 260 in the second embodiment, and FIG. 5B is a side view of the outer fitting member 260 taken along the line Vb-Vb in FIG. FIG. 5C is a partially enlarged cross-sectional view of the liquid filled type vibration damping device 200. FIG. 5C corresponds to FIG. Moreover, the same code | symbol is attached | subjected to the part same as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 5, the outer fitting member 260 in the second embodiment has a length dimension in the longitudinal direction (FIG. 5A left-right direction) of the contact portion 261, and the outer fitting member 60 in the first embodiment. The contact portion 261 is longer than the length of the contact portion 61, and the contact portion 261 protrudes outward from both sides (the left side and the right side of FIG. 5A) of the connecting portion 62. Therefore, the outer fitting member 260 is formed so that the area of the abutting portion 261 is larger than the area of the abutting portion 61 of the outer fitting member 60 in the first embodiment.

  As a result, the inner cylinder 10 is relatively displaced with respect to the outer cylinder 20 in a predetermined radial direction (vertical direction in FIG. 2 (a)), and a part of the inner surface of the vibration-proof base 40 elastically deformed in the compression direction is externally fitted. When abutting against the member 60 (see FIG. 4), the abutting area can be increased by the protruding portion of the abutting portion 261 of the external fitting member 60. That is, the area facing the liquid chamber 50 in the inner surface of the vibration isolating substrate 40 can be further reduced. Accordingly, the internal pressure of the liquid chamber 50 can be made difficult to escape (the liquid pressure is hardly relaxed) and the internal pressure of the liquid chamber 50 can be increased, so that the first liquid chamber 50a and the first liquid chamber 50 The liquid flowing between the two liquid chambers 50b can be increased. As a result, it is possible to obtain a high damping effect while making it possible to set the rubber hardness of the vibration isolating base 40 and the rubber legs 43 to a relatively low value.

  Next, a third embodiment will be described with reference to FIG. FIG. 6A is a perspective view of the external fitting member 360 in the third embodiment. In addition, the same code | symbol is attached | subjected to the part same as each said embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 6A, the outer fitting member 360 in the third embodiment has a slit portion 363 in one of the coupling portions 62 of the pair of coupling portions 62 with respect to the outer fitting member 60 in the first embodiment. Is formed. The slit portion 363 is a slit-shaped notch and extends linearly from one opening end surface of the external fitting member 360 to the other opening end surface. As described above, the slit portion 363 is formed in the connecting portion 62, so that when the outer fitting member 360 is fitted from the tip of the stopper portion 11 (see FIGS. 1 and 2), the outer fitting member 360 is expanded. Can be elastically deformed. As a result, the mounting property of the outer fitting member to the stopper portion 11 can be improved, and the assembly cost can be reduced.

  Further, the slit portion 363 is formed in the connecting portion 62 of the outer fitting member 360. Therefore, the inner cylinder 10 is relatively displaced with respect to the outer cylinder 20 in a predetermined radial direction (vertical direction in FIG. 2A), and a part of the inner surface of the vibration-proof base 40 elastically deformed in the compression direction is an outer fitting member. When abutting 60 (the abutting portion 61) (see FIG. 4), it is possible to avoid the inner surface of the prevention base 40 from abutting against the edge of the slit portion 363 and being damaged. As a result, the occurrence of cracks in the vibration isolating substrate 40 can be suppressed.

  Further, since the slit portion 363 is formed in the connecting portion 62 of the outer fitting member 360, the outer fitting member 360 (contact portion 61) is pressed against the stopper portion 11 by the inner surface of the vibration isolating base 40 (see FIG. 4), the outer fitting member 360 can be elastically deformed by the gap of the slit portion 363. Thereby, the external force which acts on the external fitting member 360 is relieved, and damage can be suppressed. As a result, the durability of the outer fitting member 360 can be improved.

  Next, a fourth embodiment will be described with reference to FIG. FIG. 6B is a cross-sectional view of the liquid filled type vibration damping device 400 according to the fourth embodiment, and corresponds to a cross section taken along line VIb-VIb in FIG. In addition, the same code | symbol is attached | subjected to the part same as each said embodiment, and the description is abbreviate | omitted.

As shown in FIG. 6B, in the liquid filled type vibration damping device 400 according to the fourth embodiment, the outer fitting member 460 is formed of a metal wire, and the outer fitting member 460 includes the covering rubber portion 42. It is attached to the stopper portion 11 by being wound around the outer surface in a spiral manner while being elastically deformed. Therefore, since the external fitting member 460 can be held using the elastic recovery force of the covering rubber portion 42, it is possible to suppress the external fitting member 460 from coming off from the stopper portion 11.

  Also in this embodiment, the inner cylinder 10 is relatively displaced with respect to the outer cylinder 20 in a predetermined radial direction (vertical direction in FIG. 2A), and is elastically deformed in the compression direction. By partly contacting the outer fitting member 460, the area facing the liquid chamber 50 in the inner surface of the vibration isolating base 40 can be reduced (see FIG. 4). Accordingly, the internal pressure of the liquid chamber 50 can be made difficult to escape (the liquid pressure is hardly relaxed) and the internal pressure of the liquid chamber 50 can be increased, so that the first liquid chamber 50a and the first liquid chamber 50 The liquid flowing between the two liquid chambers 50b can be increased. As a result, it is possible to obtain a high damping effect while making it possible to set the rubber hardness of the vibration isolating base 40 and the rubber legs 43 to a relatively low value.

  Next, a fifth embodiment will be described with reference to FIG. FIG. 7A is a front view of the outer fitting member 560 in the fifth embodiment, and FIG. 7B is a cross-sectional view of the outer fitting member 560 taken along the line VIIb-VIIb in FIG. FIG. 7C is a partially enlarged cross-sectional view of the liquid-filled vibration isolator 500.

  As shown in FIGS. 7A and 7B, an inner rubber 564 is disposed on the outer fitting member 560 in the fifth embodiment. The inner rubber 564 is a rubber-like elastic body that covers the inner surface of the outer fitting member 560, and a film part 564 a that covers the inner surface of the contact part 61, and the film part 564 a that is continuous with the connecting part 62. And a plurality of projecting portions 564b projecting inward from the inner surface. Note that a plurality of protruding portions 564b are arranged vertically and horizontally (9 in this embodiment) with a predetermined distance from adjacent ones.

  As shown in FIG. 7C, a groove-like groove portion 542a is recessed on the side surface (the left and right side surfaces in FIG. 7C) of the covering rubber portion 42 covering the stopper portion 11. The depth dimension of the groove part 542a is set to a dimension in which the protruding part 564b of the inner rubber 564 is elastically compressed and deformed between the groove bottom of the groove part 542a and the connecting part 62 of the outer fitting member 560. In addition, the groove part 542a is extended linearly along the protrusion direction of the stopper part 11 from the protrusion direction front end surface of the covering rubber part 42. Therefore, the insertability of the outer fitting member 560 into the stopper portion 11 is not hindered.

  According to the liquid-filled vibration isolator 500, the film portion 564a of the inner rubber 564 of the outer fitting member 560 is in close contact with the outer surface of the covering rubber portion 42 in a state where the outer fitting member 560 is attached to the stopper portion 11. At the same time, the projecting tip surfaces of the projecting portions 564b of the inner rubber 564 of the outer fitting member 560 are brought into close contact with the groove bottoms of the groove portions 542a of the covering rubber portion 42, so that the outer fitting member 560 is removed from the stopper portion 11. Can be prevented.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  It is naturally possible to combine part or all of the configuration in each of the above embodiments with part or all of the configuration in the other embodiments.

  In each of the above embodiments, the case where the protruding dimensions of the two stopper portions 11 are substantially the same has been described. However, the present invention is not necessarily limited to this, and the protruding dimensions of the two stopper portions 11 (that is, the stopper dimensions). The spacing between the two protrusions formed between the protruding tip of the portion 11 and the inner surface of the outer cylinder 20 may be different.

  In each of the above-described embodiments, the case where the outer fitting members 60, 260, 360, 460, and 560 are fitted to the two stopper portions 11 is described. However, the present invention is not necessarily limited thereto, and the outer fitting members 60, 260, 360, 460, 560 may be fitted on only one stopper portion 11.

  In each of the above embodiments, the case where the stopper portion 11a protrudes in the radial direction from the outer surface of the inner cylinder 10 has been described. However, the present invention is not necessarily limited thereto, and instead of this, or in addition to this. The stopper portion may protrude from the inner surface of the outer cylinder 20 in the radial direction.

  In the fourth embodiment, the case where the outer fitting member 460 is formed as a metal wire has been described. However, the present invention is not necessarily limited to this. For example, a rubber-like elastic body or a resin is used on a metal core. You may employ | adopt the wire formed by coat | covering the coating | covering material which has a softness | flexibility.

  In the fourth embodiment, the case where the outer fitting member 460 is tightly wound (that is, in a state where there is no gap between the wire rods) has been described. However, the present invention is not necessarily limited to this. It may be wound in a state where a predetermined interval is formed between them.

  In the fourth embodiment, the case where the outer fitting member 460 is formed from a wire and the wire is wound around the stopper portion 11 in a spiral manner has been described. However, the present invention is not necessarily limited thereto, and the outer fitting member 460 is made of a metal material. It may be formed from a plate-like plate material made of and wound around the stopper portion 11. In this case, the winding of the plate material may be less than one turn or may be more than one turn (that is, one having an overlap allowance).

  In the fifth embodiment, the covering rubber portion 42 is covered on the outer surface of the stopper portion 11 and the region where the outer fitting member 560 is fitted (that is, between the stopper portion 11 and the outer fitting member 560). However, the present invention is not necessarily limited to this, and at least the covering rubber portion 42 in the region where the outer fitting member 560 is fitted may be omitted. good. That is, the outer surface of the stopper portion 11 may be exposed in a region where the outer fitting member 560 is fitted. Even in this case, the inner rubber 564 (the film portion 564a and the protruding portion 564b) disposed on the inner surface of the outer fitting member 560 can be brought into close contact with the outer surface of the stopper portion 11, so It can suppress that fitting member 560 slips out.

100, 200, 400, 500, Liquid-filled vibration isolator 10 Inner cylinder 11 Stopper part 20 Outer cylinder 40 Anti-vibration base 42 Covered rubber part 43 Rubber legs 50 Liquid chamber 50a First liquid chamber 50b Second liquid chamber 55 Orifice 60, 260, 360, 460, 560 External fitting member 61, 261 Abutting portion 62 Connecting portion 62a Projecting portion 363 Slit portion

Claims (9)

An inner cylinder formed in a cylindrical shape, an outer cylinder that surrounds the inner cylinder from the outer peripheral side, a vibration isolating base that connects the inner cylinder and the outer cylinder and is made of a rubber-like elastic body, and the outer cylinder and the vibration isolating base A liquid chamber formed between the inner surface of the outer cylinder and the viscous body disposed in the liquid chamber, and the inner surface of the outer cylinder or the inner surface of the outer cylinder. In a liquid-filled vibration isolator including a stopper portion that is disposed at a predetermined interval between the outer surface of the inner cylinder and restricts relative displacement in the radial direction of the inner cylinder and the outer cylinder,
Rubber legs made of a rubber-like elastic body and connected to the vibration-proof base and partitioning the liquid chamber into a first liquid chamber and a second liquid chamber;
An orifice formed on the outer peripheral surface side of the rubber leg and communicating the first liquid chamber and the second liquid chamber;
An external fitting member that is externally fitted to the stopper portion,
The rubber hardness of the anti-vibration base and the rubber legs is set to 40 degrees or more and 65 degrees or less,
When the inner cylinder is relatively displaced in the radial direction with respect to the outer cylinder, and the stopper portion approaches the inner surface of the outer cylinder or the outer surface of the inner cylinder, the elastically deformed vibration-proof base is the outer fit. A liquid-filled vibration isolator characterized by being in contact with a member.   The liquid-filled vibration isolator according to claim 1, wherein the outer fitting member is formed of a material harder than the vibration isolator base.   The liquid-filled vibration isolator according to claim 2, wherein the outer fitting member is formed in a cylindrical shape.   4. The liquid-filled vibration isolator according to claim 3, further comprising a covering rubber portion made of a rubber-like elastic body and covering the outer surface of the stopper portion and continuing to the vibration isolation base.   The liquid-filled vibration isolator according to claim 4, wherein the outer fitting member includes a projecting portion projecting from an inner surface thereof.   The liquid-filled vibration isolator according to claim 3, wherein the outer fitting member includes a slit portion that is formed in a slit shape from an opening on one side to an opening on the other side. .   When the length dimension of the stopper portion in the protruding direction is set to be larger than the length dimension of the outer fitting member in the protruding direction, and the outer fitting member is externally fitted to the stopper portion, the stopper portion The liquid-filled vibration isolator according to any one of claims 3 to 6, wherein a protruding tip end side of the protruding portion protrudes from one side of the outer fitting member.   The liquid-filled vibration isolator according to claim 1, wherein the outer fitting member is disposed at a predetermined interval from an inner surface of the vibration isolator base.   The outer fitting member is formed in a cylindrical shape from a pair of contact portions facing the inner surface of the vibration-proof base and a pair of connection portions connecting the pair of contact portions. The liquid-filled type vibration damping device according to claim 1, wherein an edge portion of the connecting portion side of the connecting portion protrudes outward from the connecting portion.

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