JP2008261389A - Cylindrical vibration controlling support body and its installation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical vibration controlling support body having both high radial spring rigidity and axial soft spring characteristic. <P>SOLUTION: An insert member 36 formed in a manner that while defining hollow portions 46 between an inner cylindrical portion 38 and an outer cylinder portion 40, the inner cylindrical portion and outer cylinder portion are connected to each other by connecting portions 42, is buried in one axial end of a cylindrical first rubber elastic body 12 or a cylindrical second rubber elastic body 14 externally inserted into a shaft member 10. The other axial end portion of the rubber elastic body 12 is made to serve as an axial compression rubber portion 31, and also the portion thereof between the shaft member 10 and the inner cylindrical portion 38 is made to serve as a radial compression rubber portion 48. A lightening dead space 56 composed of the hollow portion 46 is formed inside of the rubber elastic body 12. Then, with a first body 16 to be connected sandwiched between the first and second rubber elastic bodies 12, 14, the shaft member 10 is fixed to a second body 18 to be connected. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cylindrical vibration-proof support and its mounting structure, and in particular, a cylindrical vibration-proof support that is interposed between two connected bodies to be vibration-proofed to each other, and such a cylindrical shape. The present invention relates to a structure for advantageously attaching a vibration-proof support to the two connected bodies.

  Conventionally, there are various types of cylindrical anti-vibration supports interposed between the first and second connected bodies to be anti-vibrated and connected to each other, and one of them is For example, those having a structure shown in Patent Document 1 below are known. The cylindrical vibration-proof support body allows the inner cylindrical fitting to be inserted into the mounting hole provided in the first coupled body at the axially intermediate portion, and from the both axial sides of the inner cylindrical fitting, The first and second rubber blocks exhibiting the following are extrapolated, and the first and second rubber blocks are overlapped with each other with the first connected body interposed therebetween, and under such a state, While the inner cylinder fitting is fixedly attached to the second connected body with the mounting bolt inserted into the inner hole, the first and second annular plate shapes are formed at both axial ends of the inner cylinder fitting. The second two pressure plates are fixed in contact with the first and second rubber blocks, respectively, and between the first and second two pressure plates and the first connected body. Thus, the first and second rubber blocks are each sandwiched in the axial direction. And the cylindrical vibration-proof support body which has such a structure is used as a cab mount, a body mount, a subframe mount, etc. for motor vehicles, for example.

  However, in the cylindrical vibration-proof support body having such a structure, the first and second first and second pressure contact plates and the first connected body are subjected to an axial input load. Although the anti-vibration effect can be effectively demonstrated based on the elastic compressive deformation of the rubber block, the load on the first and second rubber blocks is applied to the input load in the radial direction (perpendicular to the axis). Since it is difficult to exert the effect effectively, it is difficult to obtain a sufficient anti-vibration effect. Therefore, for example, a cab for an automobile that requires a soft spring characteristic in the axial direction and a high spring characteristic in the radial direction in order to achieve both a high level of ride comfort and handling stability of the vehicle. When used as a mount or the like, it has been very difficult to achieve such required characteristics.

  Under such circumstances, the following Patent Document 2 proposes a cylindrical vibration-proof support body having a structure in which radial spring rigidity is increased. That is, in this cylindrical vibration-damping support, the inner cylinder fitting, the first and second two rubber blocks extrapolated to both side portions in the axial direction of the inner cylinder fitting, and the first The first and second pressure blocks fixed to both ends in the axial direction of the inner cylinder fitting with the first and second rubber blocks sandwiched therebetween, respectively. It has the same basic structure as a conventional cylindrical antivibration support with a plate. Further, there, the first rubber block interposed between the first pressure contact plate and the first connected body is inserted through the mounting hole of the first connected body, and the second A cylindrical rubber portion that is inserted into the inner hole of the rubber block is integrally provided, and an outer cylindrical fitting is fixed to the outer peripheral surface of the cylindrical rubber portion. On the other hand, a cylindrical facing portion that is opposed to the outer cylindrical metal member at a predetermined distance in the radial direction is integrally provided. A thin cylindrical radial compression rubber portion is formed integrally with the second rubber block between the outer cylindrical metal fitting and the cylindrical facing portion in a state where it is sandwiched.

  Thus, in such a cylindrical anti-vibration support, the radial input load is effectively exerted on the radial compression rubber portion sandwiched between the outer cylindrical fitting and the cylindrical facing portion. And large spring rigidity can be exerted on the basis of the elastic compression deformation of the radial compression rubber portion between the outer cylindrical fitting and the cylindrical facing portion with respect to the radial input load. It is configured as follows.

  However, in such a conventional cylindrical anti-vibration support body, for the input load in the axial direction, as in the conventional product, the first and second pressure contact plates and the first coupled body Based on the elastic compressive deformation of the first and second rubber blocks between them, it is only possible to obtain an anti-vibration effect, which has an axial spring characteristic. Insufficient ingenuity was made to soften. Therefore, it has been difficult to ensure sufficiently soft spring characteristics in the axial direction while sufficiently increasing the spring rigidity in the radial direction.

JP 2004-291895 A JP-A-9-32875

  Here, the present invention has been made in the background as described above, and the problem to be solved is that the spring stiffness in the radial direction can be set sufficiently large, and the axial direction can be sufficiently An object of the present invention is to provide a cylindrical vibration-proof support that can effectively ensure soft spring characteristics. The present invention also provides a mounting structure for a cylindrical anti-vibration support that can be advantageously attached to two members to be anti-vibrated and connected. This is a problem to be solved.

  And in the present invention, in order to solve the problem relating to the cylindrical vibration-proof support, the gist thereof is the first to be vibration-proofed and arranged at a predetermined distance from each other. An anti-vibration support body interposed between the coupled body and the second coupled body, and (a) inserted through an attachment hole provided in the first coupled body at an intermediate portion in the axial direction. A shaft member disposed such that a portion on one side in the axial direction extends toward the second connected body side, while a portion on the other side in the axial direction extends on the opposite side to the second connected body side; b) First axially fixed at one end of the shaft member in the axial direction and extending radially outward and in contact with the second connected body on one surface. An abutting plate portion, and (c) radially outward on the other end side in the axial direction of the shaft member and with the other surface of the first abutting plate portion A second abutting plate portion which is fixedly disposed to be opposed to each other via the first coupled body with a separation, and (d) the other surface of the first abutting plate portion A cylindrical rubber elastic body extrapolated to a portion on one axial side of the shaft member in a state of being in contact with the shaft member, and (e) the first rubber plate in the second contact plate portion. A cylindrical second rubber elastic body that is extrapolated to a portion on the other side in the axial direction of the shaft member while being in contact with the surface facing the contact plate portion, and the first rubber elasticity In a state where the first coupled body is sandwiched between the body and the second rubber elastic body, the shaft member is disposed between the first contact plate portion and the first rubber elastic body. At the end opposite to the body side, it is attached to the second connected body so that the first connected body and the second connected body are connected in a vibration-proof manner. In the vibration support, A side cylinder part and an outer cylinder part arranged around the inner cylinder part at a predetermined distance from each other in the radial direction are provided, and the inner cylinder part and the outer cylinder part are integrally connected to each other. A plurality of connecting portions extend radially between the inner tube portion and the outer tube portion and are arranged to face each other at a predetermined distance in the circumferential direction between the inner tube portion and the outer tube portion. Further, a rigid insert member comprising a plurality of hollow portions adjacent to each other in the circumferential direction with the connecting portion interposed therebetween is at least one of the first rubber elastic body and the second rubber elastic body. The inner cylinder portion is disposed around the shaft member and has a diameter within the end opposite to the contact side with the first contact plate portion or the second contact plate portion. The insert of the first and second rubber elastic bodies is embedded so as to be spaced apart outward in the direction. A thin-walled cylindrical radial compression rubber portion comprising a rubber elastic body portion positioned between the shaft member and the inner cylindrical portion of the insert member with respect to the rubber elastic body in which the rubber member is embedded; and the insert An axial compression rubber portion made of a rubber elastic body portion opposite to the first connected body side with a member interposed therebetween, and a meat emptying space made of the plurality of hollow portions of the insert member were formed. It is in the cylindrical vibration-proof support characterized by the above.

  In addition, according to one of the preferable aspects of the cylindrical vibration-proof support according to the present invention, the insert member is formed using a synthetic resin material.

  Moreover, according to one of the desirable aspects of the cylindrical vibration-proof support according to the present invention, the connecting portion of the insert member is configured to have a plate shape.

  Furthermore, according to one of the other desirable modes of the cylindrical vibration-damping support according to the present invention, the communication that allows the hollow portion of the insert member to communicate with the outside to the rubber elastic body in which the insert member is embedded. A hole is provided, and the hollow portion is configured to open toward the outside through the communication hole.

  Furthermore, according to another preferable aspect of the cylindrical vibration-proof support according to the present invention, the inner corners on both sides in the axial direction of the inner cylindrical portion of the insert member are curved angles formed by convex curved surfaces. Part.

  Moreover, according to one of the advantageous aspects of the cylindrical vibration-damping support according to the present invention, the insert member is a contact side of the first rubber elastic body with the first contact plate portion. It is embedded and configured in the opposite end.

  Further, in the case where the insert member is embedded in the first rubber elastic body, it is preferable that the second contact member is disposed on the outer peripheral portion of the first contact plate portion from the first connected body side. A cylindrical portion that extends toward the coupled body side of the first rubber elastic body and surrounds a part of the axial compression rubber portion of the first rubber elastic body from the outside is provided integrally with the outer cylinder of the insert member The outer flange portion is integrally formed with the first rubber elastic body in a state where the outer flange portion is integrally formed with the portion and the insert member is embedded in the first rubber elastic body. The axial compression of the first rubber elastic body is covered with a covering rubber portion and is opposed to the front end surface of the cylindrical portion of the first abutting plate portion at a predetermined distance. When the rubber is greatly compressed and deformed in the axial direction, the outer flange portion The first connected body and the second connected body are brought into contact with the distal end surface of the cylindrical portion of the first contact plate portion via the covering portion rubber portion. It will be configured so that excessive relative displacement in the approaching direction of each other can be prevented.

  In the present invention, in order to solve the problem relating to the mounting structure of the above-described cylindrical vibration-proof support, the cylindrical vibration-proof support having the above-described characteristics is arranged at a predetermined distance. In addition, the first and second connected bodies to be vibration-proof connected are attached in a state of being interposed between the first connected body and the second connected body. The shaft member is inserted into the mounting hole provided in the first coupled body, while the first rubber elastic body and the second rubber elastic body are In the state where the embedded portion of the insert member in the one where the insert member is embedded is disposed inside the mounting tube portion integrally formed so as to extend in the circumferential direction of the mounting hole with respect to the mounting portion, The first coupled body between one rubber elastic body and the second rubber elastic body By sandwiching, the first rubber elastic body is interposed between the first connected body and the second connected body, and the first rubber with respect to the first connected body. Based on the clamping force between the elastic body and the second rubber elastic body, the first and second rubber elastic bodies are attached to the first coupled body, and the first contact plate portion is After contacting the second connected body, the shaft member is inserted into the first rubber elastic body at the end opposite to the first rubber elastic body with the first contact plate portion interposed therebetween. The gist of the mounting structure of the cylindrical vibration-proof support body characterized in that it is mounted on the second connected body.

  That is, in the cylindrical vibration-damping support according to the present invention, the first rubber elastic body and the second rubber support body are interposed between the first connected body and the second connected body. The embedded portion of the insert member in the rubber elastic body is, for example, arranged so as to be sandwiched between a cylindrical portion and a shaft member provided so as to extend in the circumferential direction of the mounting hole with respect to the first connected body. As a result, a radial input load is effectively exerted on the thin cylindrical radial compression rubber portion provided in the embedded portion of the insert member of the rubber elastic body, and as a result, the radial input load is affected. On the other hand, sufficiently high spring rigidity can be exhibited based on the elastic compression deformation of the radial compression rubber portion between the shaft member and the inner cylindrical portion of the insert member.

  Further, in such a cylindrical vibration-proof support, when the insert member is embedded in both the first rubber elastic body and the second rubber elastic body, the axial compression rubber provided in both the rubber elastic bodies When the insert member is embedded in the rubber elastic body or only in one of the two rubber elastic bodies, the axial compression rubber section provided in the rubber elastic body in which the insert member is embedded, and the insert member An axial input load is effectively exerted on the entire rubber elastic body that is not embedded, whereby the first and second abutment plate portions and the first input plate are against the axial input load. A sufficient vibration-proofing effect can be exhibited based on the entire elastic compression deformation of the axial compression rubber portion and the rubber elastic body with the one connected body.

  In the tubular vibration-damping support of the present embodiment, in particular, the hollow space formed by the hollow portion of the insert member is formed in the rubber elastic body in which the insert member is embedded, and the axial compression rubber portion and It is provided so that it may be located between one to-be-connected bodies. Therefore, when the axial compression rubber part is compressed and deformed, a part of the rubber enters the empty space, so that the axial compression rubber part can be easily and large with a relatively small input load. As a result, the spring characteristics in the axial direction of the axial compression rubber part can be softened very advantageously.

  Therefore, in the cylindrical vibration isolating support according to the present invention as described above, the radial spring rigidity can be set sufficiently large, and in addition, a sufficiently soft spring characteristic in the axial direction can be effectively obtained. Can be secured. As a result, extremely excellent anti-vibration performance can be exhibited such that the ride comfort and the handling stability of the vehicle can be made compatible at a higher level.

  Further, even in the mounting structure of the cylindrical vibration isolating support according to the present invention, since the cylindrical vibration isolating support having the above-described features is used, it can be achieved in such a cylindrical vibration isolating support. It is possible to effectively enjoy substantially the same actions and effects as the excellent actions and effects.

  Hereinafter, in order to clarify the present invention more specifically, an embodiment of the present invention will be described in detail with reference to the drawings.

  First, in FIG. 1, a cab mount for a truck vehicle as an embodiment of a cylindrical vibration isolator having a structure according to the present invention is interposed between a cabin and a frame to be anti-vibration connected. The state is schematically shown in its longitudinal cross-sectional form. As apparent from FIG. 1, the cab mount of this embodiment includes an inner cylinder fitting 10 as a shaft member and a first rubber elasticity extrapolated to a portion on one axial side of the inner cylinder fitting 10. A first rubber block 12 as a body, and a second rubber block 14 as a second rubber elastic body, which is extrapolated to a portion on the other side in the axial direction. Then, with respect to the truck-type automobile, the inner cylinder fitting 10 is vertically moved between the frame 16 as the first connected body and the mounting bracket 18 provided in the cabin as the second connected body in FIG. The first rubber block 12 extends in the direction and is positioned on the upper side, and is mounted in an interposed state. In the following, for the sake of convenience, the side of the first rubber block 12 that is the upper side in FIG. 1 will be referred to as the upper side or the upper side, and the side of the second rubber block 14 that is the lower side in FIG. Let's say down.

  More specifically, the inner cylinder fitting 10 has a small diameter and thick cylindrical shape. And the upper side contact metal fitting 20 is being fixed with respect to the upper end surface. The upper abutment fitting 20 has a substantially thick bottomed cylindrical shape as a whole, and has a cylindrical portion 22 having an inner diameter sufficiently larger than the outer diameter of the inner cylindrical fitting 10 and one axial direction of the cylindrical portion 22. It integrally has a bottom 24 as a first contact plate that closes the opening on the side. In the upper abutment fitting 20, the tip surface of the cylindrical portion 22 is a stopper surface 26 that has an annular surface shape and is positioned radially outward of the inner cylindrical fitting 10, and further, the center of the bottom portion 24. A through hole 28 having a diameter substantially the same as the inner diameter of the inner cylinder fitting 10 is formed in the portion.

  And such upper contact metal fitting 20 overlaps the opening peripheral part of penetration hole 28 in the inner surface of bottom 24 on the upper end surface of inner cylinder metal fitting 10 on the same axis, and cylindrical part 22 Around the upper end portion of the inner cylindrical metal fitting 10, it is fixed to the inner cylindrical metal fitting 10 by welding or the like in a state of being extended in the vertical direction so as to surround it at a predetermined distance radially outward. ing. Thus, the bottom 24 of the upper contact metal fitting 20 is provided at a fixed position at the upper end of the inner tubular metal fitting 10 so as to spread outward in the radial direction.

  Further, as shown in FIGS. 1 to 3, the first rubber block 12 extrapolated to the upper portion of the inner cylinder fitting 10 has a substantially thick cylindrical shape as a whole, and has an inner diameter of the inner cylinder. The size is larger than the outer diameter of the metal fitting 10 by a predetermined dimension. Further, on the outer peripheral surface of the first rubber block 12, a concave groove-shaped straight hole that opens radially outward and extends continuously in two locations at the upper and lower portions of the axially intermediate portion. Each part 30 is formed one by one, and a counterbore 32 extending continuously in the circumferential direction of the opening is provided on the upper end surface, and the upper end is thinned.

  Thereby, in this case, in the first rubber block 12, the axial spring characteristic of the upper portion including the upper end portion where the counterbore portion 32 and the counterbore portions 30 and 30 are provided and the intermediate portion in the axial direction is particularly It is adjusted so as to be soft at the initial stage of input, and thus the soft upper portion of such an axial spring characteristic is the axial compression rubber portion 31. In FIG. 2, reference numeral 33 denotes a ring-shaped positioning projection integrally provided with respect to the upper inner peripheral surface of the axial compression rubber portion 31. When it is extrapolated to the cylindrical metal fitting 10, it is pressed against the outer peripheral surface of the inner cylindrical metal fitting 10 to position the radial position at the upper end of the first rubber block 12.

  Further, in the first rubber block 12, a portion located below the axial compression rubber portion 31 is a bulging portion 34 that is bulged outward in the radial direction. An insert member 36 is embedded in the bulging portion 34.

  As is apparent from FIGS. 2 and 3, the insert member 36 has an inner cylindrical portion 31, an outer cylindrical portion 40, and a plurality of connecting portions 42 that integrally connect them, and as a whole, a ring-shaped or thru- Is constituted by an integrally molded product having a cylindrical shape. Here, the insert member 36 is formed using a synthetic resin material having high hardness, such as polyamide (PA), polyphenylene sulfide (PPS), polypropylene (PP), etc., and has sufficient rigidity. It has been.

  The inner cylindrical portion 38 of the insert member 36 has a thick cylindrical shape as a whole, and has an inner diameter that is slightly larger than the bulging portion 34 of the first rubber block 12 and a height that is a predetermined dimension smaller. Have. Further, in the inner cylindrical portion 38, two inner corner portions positioned at the upper end and the lower end of the inner peripheral surface and an outer upper end corner portion positioned at the upper end of the outer peripheral surface are respectively curved with convex curved surfaces. It is a corner.

  The outer cylindrical portion 40 has an inner diameter that is a predetermined dimension larger than the outer diameter of the inner cylindrical portion 38, an outer diameter that is smaller than the outer diameter of the bulging portion 34 of the first rubber block 12, and slightly smaller than the inner cylindrical portion 38. It has a thin cylindrical shape having a large height, and is coaxially disposed around the inner cylindrical portion 38 at a predetermined distance outward in the radial direction. Further, in such an outer cylindrical portion 40, an outer flange portion 44 protruding at a predetermined height radially outward and continuously extending in the circumferential direction is integrally formed with an annular plate shape at the upper end portion of the outer peripheral surface. It is installed around. Even in the outer cylindrical portion 40, the inner upper end corner portion and the outer lower end corner portion respectively located at the upper end of the inner peripheral surface and the lower end of the outer peripheral surface are curved corner portions each having a convex curved surface. It is said that.

  On the other hand, the connection part 42 which connects these inner side cylinder part 38 and the outer side cylinder part 40 mutually consists of a thin flat plate. Then, from a plurality of locations on the outer peripheral surface of the inner cylindrical portion 38 that are equidistantly spaced in the circumferential direction, radially extend toward the inner peripheral surface of the outer cylindrical portion 40 in a radial form, The outer cylindrical portion 40 is integrally connected to the inner peripheral surface.

  Thus, in the insert member 36, the inner cylindrical portion 38 and the outer cylindrical portion 40 are connected to each other at a plurality of locations on the circumference by the plurality of connecting portions 42, and the plurality of connecting portions 42 are also connected. However, they are opposed to each other with a certain distance in the circumferential direction. Thereby, between the inner cylinder part 38 and the outer cylinder part 40, each opposing surface of the two connection parts 42 and 42 which mutually oppose, and the inner cylinder part 38 located between these two connection parts 42 mutually. A plurality of hollow portions 46 surrounded by the outer peripheral surface portion and the inner peripheral surface portion of the outer cylindrical portion 40 are arranged so as to be adjacent to each other in the circumferential direction with the connecting portions 42 interposed therebetween. Has been.

  And such an insert member 36 is coaxially arrange | positioned inside the bulging part 34 which consists of the lower end part of the 1st rubber block 12, and the whole outer surface is coat | covered with the thin rubber part. Have been buried. Thus, the rubber portion that covers and adheres to the inner peripheral surface of the inner cylindrical portion 38 of the insert member 36 in the bulged portion 34 that is the embedded portion of the insert member 36 in the first rubber block 12. Is a radially compressed rubber portion 48 having a thin cylindrical shape, and covers the entire outer peripheral surface and lower end surface of the outer cylindrical portion 40 and the lower end surface of the connecting portion 42. Thus, the fixed rubber portion is a thin buffer rubber portion 50. Furthermore, the rubber part which covers the whole surface and adheres to the lower end surface of the inner cylinder part 38 and has a ring-like ridge form in which the rubber part protrudes at a predetermined height below the bulge part 34 is provided. 52.

  Further, in such a bulging portion 34, a communication hole 54 penetrating the portion is provided in a portion positioned below each of the plurality of hollow portions 46 provided in the insert member 36, and the communication hole 54. The hollow portion 46 is opened downward and communicated with the outside. And here, with such a plurality of hollow portions 46 and a plurality of communication holes 54 respectively corresponding thereto, the bulging portion 34 of the first rubber block 12 on the lower end surface of the first rubber block 12 A plurality of open-out cavities 56 in the form of open deep holes or recesses are formed adjacent to each other in the circumferential direction.

  On the other hand, as shown in FIG. 4, the second rubber block 14 extrapolated to the lower portion of the inner cylindrical metal fitting 10 has a substantially thick cylindrical shape as a whole, and has an inner diameter and a wall thickness of The inner diameter and thickness of one rubber block 12 are approximately the same. Further, even in the second rubber block 14, similarly to the first rubber block 12, it is opened radially outward in two locations spaced apart vertically on the outer peripheral surface and continuously in the circumferential direction. One extending groove-shaped straight portion 58 is formed. Thereby, the spring characteristic in the axial direction of the second rubber block 14 is adjusted so as to be soft at the initial stage of load input.

  Further, the second rubber block 14 is formed with a circular recess 60 opened at the lower end surface at a relatively shallow depth. In the circular recess 60, a disc-shaped lower contact fitting 62 as a second contact plate portion having a thickness and an overall shape corresponding to the depth and the inner shape is coaxially formed. It is accommodated so as to be positioned, and is vulcanized and bonded to the bottom surface of the circular recess 60. That is, here, the second rubber block 14 is constituted by an integrally vulcanized molded product in which the lower contact fitting 62 is vulcanized and bonded to the lower end surface. A center hole 63 through which a mounting bolt inserted into the inner cylinder fitting 10 can be inserted is formed at the center of the lower contact fitting 62 as will be described later. In FIG. 4, 64 is a ring-shaped positioning projection integrally provided with respect to the upper inner peripheral surface of the second rubber block 14, and the second rubber block 14 is the inner cylinder as will be described later. When inserted into the metal fitting 10, it is pressed against the outer peripheral surface of the inner cylinder metal fitting 10 to position the radial position at the upper end of the second rubber block 14.

  Thus, in the cab mount having the inner cylinder bracket 10 and the first and second rubber blocks 12 and 14 having such a structure, in the mounting structure shown in FIG. It is interposed between a cabin (not shown) and the frame 16 and attached.

  That is, the upper surface of the bottom 24 of the upper abutting metal fitting 20 that is inserted into the attachment hole 66 formed in the frame 16 through the attachment hole 66 in the axial direction and fixed to the upper end portion of the inner cylindrical metal fitting 10 is connected to the cabin. It is arranged in a state of being superimposed on the lower surface of the mounting bracket 18. Then, the mounting bolt 68 inserted from the lower opening into the inner hole of the inner cylindrical metal fitting 10 passes through the through hole 28 of the upper abutting metal fitting 20 and the insertion hole 70 of the mounting bracket 18, and the upper end is attached to the mounting bracket 18. The upper end of the mounting bracket 18 is screwed onto a nut 72 fixed to the upper surface of the mounting bracket 18.

  As a result, the inner bracket 10 has the mounting bracket 66 in a state in which the upper portion projects upward (extends) through the mounting hole 66 of the frame 16 while the lower portion projects downward (extends). 18 is fixed. In such a state, the bottom 24 of the upper abutting fitting 20 fixed to the upper end of the inner cylindrical fitting 10 spreads outward in the radial direction of the inner cylindrical fitting 10, and is attached to the entire upper surface thereof. While being brought into contact with the lower surface of the bracket 18, the cylindrical portion 22 extends downward around the inner cylindrical metal fitting 10 so as to surround the cylindrical portion 10 at a predetermined distance radially outward. Each is fixedly arranged.

  The first rubber block 12 is extrapolated in the upper portion protruding upward from the mounting hole 66 of the inner cylindrical metal fitting 10, while the lower portion protruding downward from the mounting hole 66 has the first Two rubber blocks 14 are arranged in an extrapolated manner.

  Further, the first rubber block 12 that is externally inserted into the upper portion of the inner cylindrical metal fitting 10 has an upper abutting metal fitting 20 fixed in contact with the mounting bracket 18 on the upper and lower end faces, and a frame 16 positioned opposite thereto. , And are interposed between the upper contact fitting 20 and the frame 16. Further, here, the height of the first rubber block 12 is set to a predetermined dimension larger than the distance between the lower surface of the upper contact fitting 20 that contacts the upper and lower surfaces of the first rubber block 12 and the upper surface of the frame 16. Yes. As a result, the first rubber block 12 is sandwiched between the upper contact metal fitting 20 and the frame 16 and is preliminarily compressed in the axial direction.

  Further, in the state where the first rubber block 12 is interposed between the upper contact metal fitting 20 and the frame 16, most of the axial compression rubber portion 31 including the upper side portion of the first rubber block 12. Is positioned inside the cylindrical portion 22 of the upper abutment fitting 20 so as to be surrounded radially inward at a predetermined distance, while being lower than the axial compression rubber portion 31. Most of the bulging portion 34, except for the upper portion, is accommodated in the mounting recess 74 provided in the frame 16.

  In other words, in this embodiment, the frame 16 portion facing the bottom 24 of the upper contact fitting 20 has an inner diameter slightly larger than the outer diameter of the bulging portion 34 of the first rubber block 12 and the height of the bulging portion 34. A cylindrical peripheral wall portion 76 as an attachment tube portion having a small height, and a bottom opening that closes the lower opening of the cylindrical peripheral wall portion 76 and has the attachment hole 66 formed in the center thereof. A mounting recess 74 that integrally includes the wall portion 78 is provided. The most part of the bulging portion 34 is inserted into the mounting recess 74, while the upper portion of the bulging portion 34 is projected upward through the upper opening of the mounting recess 74. Further, the entire axial compression rubber portion 31 is positioned without any insertion in the mounting recess 74.

  Of the bulging portion 34 fitted in the mounting recess 74, the cushioning rubber portion 50 portion covering the outer peripheral surface of the outer cylindrical portion 40 of the insert member 36 is the inner peripheral surface of the peripheral wall portion 76 of the mounting recess 74. The shock absorbing rubber portion 50 that covers the lower end surface of the connecting portion 42 of the insert member 36 is in contact with the upper surface (inner surface) of the bottom wall portion 78 of the mounting recess 74. As a result, the relative displacement of the insert member 36 downward and in the radial direction relative to the frame 16 provided with the mounting recess 74 is elastically restricted.

  Further, the radial compression rubber portion 48 fixed to the inner peripheral surface of the inner cylindrical portion 38 of the insert member 36 in which relative displacement with respect to the frame 16 in the downward direction and the radially outer direction is restricted is provided on the inner periphery thereof. The surface is brought into contact with the outer peripheral surface of the inner cylinder fitting 10. The radial compression rubber portion 48 is sandwiched between the inner cylindrical portion 38 of the insert member 36 and the inner cylindrical metal fitting 10 because the entire first rubber block 12 is in a pre-compressed state. Yes.

  Further, the positioning rubber portion 52 fixed to the lower end surface of the inner cylindrical portion 38 is arranged so that the inner peripheral surface of the mounting hole 66 provided in the bottom wall portion 78 of the mounting concave portion 74 is opposed to the inner peripheral surface thereof. The first rubber block 12 and the inner cylindrical metal fitting 10 are coaxial in the mounting hole 66 with no backlash. The radial positions of the first rubber block 12 and the inner cylindrical metal fitting 10 are positioned so as to be positioned at each other.

  Furthermore, the outer flange portion 44 provided at the upper end portion of the outer cylindrical portion 40 of the insert member 36 among the upper portion of the bulging portion 34 that is projected upward from the mounting recess 74, and covers the outer flange portion 44. The cushioning rubber portion 50 portion is vertically below the stopper surface 26, which is the lower end surface of the cylindrical portion 22 of the upper abutting fitting 20, on the periphery of the upper opening portion of the mounting recess 74 in the frame 16. Opposite positions are separated by a predetermined distance.

  On the other hand, the second rubber block 14 which is arranged on the lower portion of the inner cylinder fitting 10 protruding downward from the attachment hole 66 has an inner peripheral surface of the attachment hole 66 and an inner cylinder at the inner peripheral portion of the upper end surface thereof. It is brought into contact with the lower end surface of the positioning rubber portion 52 of the first rubber block 12 which is inserted into a gap formed between the outer peripheral surface of the metal fitting 10 and the mounting recess 74 of the frame 16 on the entire outer peripheral portion. Is brought into contact with the lower surface of the bottom wall 78.

  In this case, the washer portion 80 formed integrally with the head of the mounting bolt 68 inserted into the inner hole of the inner cylinder fitting 10 is vulcanized and bonded to the lower end surface of the second rubber block 14. The mounting bolt 68 is fastened and fixed to a nut 72 fixed on the mounting bracket 18 in a state where it is brought into contact with the lower surface of the fitting 62. As a result, the second rubber block 14 is brought into contact with the washer portion 80 of the mounting bolt 68 based on the tightening force of the mounting bolt 68 against the nut 72, and the bottom wall portion 78 of the mounting recess 74. Is pre-compressed by a predetermined amount in the axial direction.

  As described above, in the cab mount according to the present embodiment, the first rubber block 12 and the second rubber which are respectively disposed on the upper side portion and the lower side portion of the inner cylinder fitting 10 fixed to the mounting bracket 18. The block 14 is in contact with the lower surface of the mounting bracket 18 of the cabin and the upper side of the bottom wall portion 78 of the mounting recess 74 of the frame 16 is sandwiched between the bottom portion 24 of the upper contact fitting 20 fixedly disposed. It is clamped and fixed in a pre-compressed state between the lower abutting fitting 62 that is fixedly disposed so as to face the bottom portion 24 of the abutting fitting 20, and such first Between the rubber block 12 and the second rubber block 14, the bottom wall portion 78 of the mounting recess 74 of the frame 16 is sandwiched. As a result, the cab mount is interposed between the cabin and the frame 16 so that the cabin is supported in an anti-vibration manner with respect to the frame 16.

  Thus, in such a cab mount, in a state of being interposed between the cabin and the frame 16, the cab mount is embedded in the bulging portion 34 of the first rubber block 12, and the relative displacement outward in the radial direction with respect to the frame 16 is caused. An input load in the radial direction is effectively exerted on the radially compressed rubber portion 48 sandwiched between the inner cylindrical portion 38 of the regulated insert member 36 and the inner cylindrical fitting 10. Thus, a large spring is generated based on the elastic compressive deformation of the radial compression rubber portion 48 between the inner cylindrical portion 38 of the insert member 36 and the inner cylindrical fitting 10 with respect to the radial input load. Rigidity is demonstrated.

  In addition, with respect to an axial input load that causes the mounting bracket 18 and the frame 16 to approach each other, the first load mainly between the upper contact fitting 20 and the bottom wall portion 78 of the mounting recess 74 in the frame 16 is the first. Based on the elastic compressive deformation of the axial compression rubber portion 31 of the rubber block 12, the anti-vibration effect can be effectively exhibited. Further, with respect to the axial input load that separates the mounting bracket 18 and the frame 16 from each other, the first load mainly between the lower contact fitting 62 and the bottom wall portion 78 of the mounting recess 74 in the frame 16 is the same. Based on the elastic compression deformation of the two rubber blocks 14, the vibration isolation effect can be effectively exhibited.

  In this case, particularly, when the axial compression rubber portion 31 of the first rubber block 12 is compressed and deformed with respect to an axial input load that causes the mounting bracket 18 and the frame 16 to approach each other. A part of the lower portion of the axial compression rubber portion 31 enters into a plurality of hollow spaces 56 formed by a plurality of hollow portions 46 of the insert member 36 whose downward relative displacement with respect to the frame 16 is restricted. . As a result, the axial compression rubber portion 31 of the first rubber block 12 can be easily and greatly elastically deformed during an axial input load that causes the mounting bracket 18 and the frame 16 to approach each other. Thus, in such an axial compression rubber part 31, soft spring characteristics can be obtained more sufficiently. As a result, a further excellent anti-vibration effect can be exhibited.

  Therefore, in the cab mount of this embodiment as described above, desired vibration isolation characteristics are effectively obtained based on sufficiently large radial spring stiffness and sufficiently soft spring characteristics in the axial direction. As a result, excellent vibration-proof performance such that the riding comfort and handling stability of a truck-based vehicle can be achieved at a higher level can be exhibited extremely advantageously.

  In the cab mount of this embodiment, the outer flange portion 44 of the insert member 36 embedded in the bulging portion 34 of the first rubber block 12 is connected to the mounting recess 74 of the frame 16 via the buffer rubber portion 50. A predetermined distance is provided vertically below the stopper surface 26 which is the tip end surface of the cylindrical portion 22 of the upper abutting metal fitting 20 which is brought into contact with the peripheral portion of the opening and is in contact with and fixed to the mounting bracket 18 of the cabin. They are facing each other. Therefore, the cylindrical portion 22 of the upper abutment fitting 20 is caused by compressive deformation of the axial compression rubber portion 31 of the first rubber block 12 when a large axial load is applied to bring the mounting bracket 18 and the frame 16 close to each other. The stopper surface 26 is elastically brought into contact with the outer flange portion 44 of the insert member 36, so that excessive deformation of the axial compression rubber portion 31 can be prevented. As a result, the occurrence of damage or the like due to excessive deformation of the axial compression rubber portion 31 and thus the first rubber block 12 is advantageously prevented, and thus the durability of the first rubber block 12 and further the cab mount as a whole. Can be effectively enhanced.

  Furthermore, in the present embodiment, the two inner corners and the outer upper end corner of the inner cylindrical portion 38 of the insert member 36, the inner upper end corner and the outer lower corner of the outer cylindrical portion 40, etc. All the corners of the insert member 36 to which the rubber part is pressed at the time of radial or axial compression deformation are curved corners. Therefore, due to repeated compressive deformation of the first rubber block 12 due to axial or radial load input, cracks or the like occur in contact portions with the corners of the insert member 36 in the first rubber block 12. This can advantageously be prevented. Also by this, the durability of the first rubber block 12 and the entire cab mount can be effectively enhanced.

  Further, in the cab mount of the present embodiment, since the insert member 36 is constituted by an integrally molded product made of a synthetic resin material having sufficient rigidity, the insert member 36 and thus the overall cab mount can be improved. Weight reduction can be advantageously achieved.

  Further, in such a cab mount, since the connecting portion 42 of the insert member 36 is formed of a thin flat plate, the connecting portion 42 is connected in a limited space between the inner cylindrical portion 38 and the outer cylindrical portion 40 of the insert member 36. The hollow portion 46 defined by the portion 42 can be formed with as large a volume as possible. As a result, the empty space 56 formed in the hollow portion 46 in the bulging portion 34 of the first rubber block 12 is also made sufficiently large in volume. As a result, at the time of compressive deformation of the axial compression rubber portion 31 of the first rubber block 12 due to the axial load input, the lower portion of the axial compression rubber portion 31 is easily placed in the empty space 56. And it becomes possible to enter with a larger volume, and thus the spring characteristics in the axial direction of the axial compression rubber part 31 can be further sufficiently softened.

  Furthermore, in the present embodiment, since the connecting portions 42 of the insert member 36 are opposed to each other at equal intervals in the circumferential direction, the plurality of hollow portions 46 of the insert member 36 and the plurality of such hollow portions 46 are further provided. Corresponding to the hollow portion 46, a plurality of hollow spaces 56 formed in the bulging portion 34 of the first rubber block 12 are arranged so as to be equally positioned in the circumferential direction with the same volume. The Thereby, the soft spring characteristic in the axial direction of the axial compression rubber part 31 can be exhibited uniformly or evenly in the circumferential direction.

  In the cab mount of the present embodiment, the insert member 36 is a lower end portion (a bulging portion) on the frame 16 side of the first rubber block 12 interposed between the cabin mounting bracket 18 and the frame 16. 34) embedded in the interior. For this reason, for example, the mounting recess 74 of the frame 16 is formed so as to open downward, and the frame 16 side of the second rubber block 14 interposed between the frame 16 and the lower contact fitting 62 is provided. The upper end portion of the upper contact fitting 20 is attached to the bottom portion 24 as compared with the case where the upper end portion is accommodated in the mounting recess 74 and the insert member 36 is embedded in the upper end portion of the second rubber block 14. The distance from the contact surface of the bracket 18 to the center position in the height direction (axial direction) of the inner cylindrical portion 38 of the insert member 36 can be advantageously reduced. Thus, in such a cab mount, for example, the inner cylindrical fitting 10 is centered in the height direction of the inner cylindrical portion 38 of the insert member 36 that is accommodated in the mounting recess 74 of the frame 16 by a radial load input. When the inner cylinder fitting 10 is displaced in the twisting direction so as to swing in the radial direction with the position as a fulcrum, the twisting angle of the inner cylinder fitting 10 does not change, so that the mounting bracket 18 contacts the bottom 24 of the upper contact fitting 20. The uppermost portion of the first rubber block 12 (the contact portion with the bottom 24 of the upper abutting fitting 20) is reduced by the distance from the contact surface to the center position in the height direction of the inner cylindrical portion 38 of the insert member 36. ) In the radial direction (squeezing direction) can be reduced. As a result, the durability of the first rubber block 12 can be advantageously ensured.

  Further, in the cab mount of the present embodiment, the hollow space 56 provided in the bulging portion 34 opens to the outside through the communication hole 54 and communicates therewith. When a part of the lower side portion enters into the empty space 56 due to compressive deformation in the axial direction, air is discharged into the empty space 56 through the communication hole 54. As a result, it becomes easier for a part of the lower portion of the axial compression rubber portion 31 to enter the hollow space 56, so that the axial spring characteristics of the axial compression rubber portion 31 are further increased. It can be advantageously made soft.

  As mentioned above, although one Embodiment of this invention was explained in full detail, this is an illustration to the last, Comprising: This invention is not limited at all by the specific description regarding this Embodiment.

  For example, the size and number of the hollow portions 46 provided in the insert member 36 can be changed as appropriate.

  Also, the insert member 36 is not embedded in the first rubber block 12 as the first rubber elastic body, but is embedded only in the second rubber block 14 as the second rubber elastic body, or the first rubber. Even if it is embedded in both the block 12 and the second rubber block 14, there is no problem.

  Further, in the above-described embodiment, the mounting recess 74 of the frame 16 is provided, and the first rubber block 12 which is the embedded portion of the insert member 36 is bulged inside the peripheral wall 76 which is the mounting cylinder portion of the mounting recess 74. Although the portion 34 is disposed, for example, an attachment cylinder portion is integrally provided on the upper surface of the flat frame 16, and the bulging portion 34 of the first rubber block 12 is provided inside the attachment cylinder portion. Can also be arranged.

  Moreover, the upper contact metal fitting 20 can be made into a simple flat plate shape, and the first contact plate portion can be constituted by such a flat upper attachment metal fitting.

  Further, the upper mounting bracket 20 is fixed to the upper end surface of the first rubber block 12 and is sandwiched between the inner cylindrical bracket 10 and the mounting bracket 18, so that the upper mounting bracket 20 can be fixedly fixed while being in contact with the mounting bracket 18. It is also possible to arrange.

  Furthermore, the lower contact fitting 62 as the second contact plate portion may be fixed to the lower end portion of the inner cylinder fitting 10.

  Moreover, in this embodiment, although the shaft member was comprised with the inner cylinder metal fitting 10, this shaft member can also be comprised with an attachment bolt etc., for example.

  In addition, in the above-described embodiment, a specific example of the application of the present invention to a cab mount for a truck vehicle and its mounting structure has been shown. Needless to say, the present invention can be advantageously applied to any of the vibration isolation support and the cylindrical vibration isolation support mounted on a vehicle other than an automobile, and further to the mounting structure of the cylindrical vibration isolation support. .

  In addition, although not enumerated one by one, the present invention can be carried out in an embodiment to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

It is longitudinal cross-sectional explanatory drawing which shows one Embodiment of the cylindrical vibration-proof support body which has a structure according to this invention in the attachment state to a motor vehicle. It is longitudinal cross-sectional explanatory drawing which shows the 1st rubber elastic body which the cylindrical vibration-proof support body shown by FIG. 1 has. FIG. 3 is an explanatory view taken along the line III-III in FIG. 2. It is a longitudinal cross-sectional explanatory drawing which shows the 2nd rubber elastic body which the cylindrical vibration-proof support body shown by FIG. 1 has.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Inner cylinder metal fitting 12 First rubber block 14 Second rubber block 16 Frame 18 Mounting bracket 20 Upper contact metal fitting 22 Cylinder part 24 Bottom part 31 Axial compression rubber part 34 Swelling part 36 Insert member 38 Inner cylinder part 40 Outer cylinder part 42 connecting portion 44 outer flange portion 46 hollow portion 48 radial compression rubber portion 56 empty space 62 lower contact fitting 74 mounting recess 76 peripheral wall portion

Claims (8)

An anti-vibration support body disposed between a first connected body and a second connected body to be anti-vibrated and arranged at a predetermined distance from each other, comprising: (a) the first An axially intermediate portion is inserted into a mounting hole provided in one connected body, and one axially extending portion extends to the second connected body side, while the other axially extending portion is the second connected portion. A shaft member disposed so as to extend on the side opposite to the coupled body side; and (b) extending radially outwardly on one end side in the axial direction of the shaft member and on the one surface thereof, A first abutting plate portion fixedly disposed in contact with the coupling body, and (c) extending radially outward to the other axial end side of the shaft member and A second abutting plate portion fixedly disposed opposite to the other surface of the one abutting plate portion with a predetermined distance therebetween via the first connected body. (D) a cylindrical first rubber elastic body that is extrapolated to a portion on one side in the axial direction of the shaft member in a state of being in contact with the other surface of the first contact plate portion; (E) A cylindrical shape that is extrapolated to a portion on the other side in the axial direction of the shaft member while being in contact with the surface of the second contact plate portion facing the first contact plate portion. A second rubber elastic body, wherein the shaft member has the first rubber elastic body sandwiched between the first rubber elastic body and the second rubber elastic body. The first coupled body and the second coupled body are attached to the second coupled body at the end opposite to the first rubber elastic body with the abutting plate portion interposed therebetween. In the cylindrical vibration-proof support that is connected to the body to be vibration-proof,
It has an inner cylinder part and an outer cylinder part arranged around the inner cylinder part at a predetermined distance radially outwardly, and integrally connects the inner cylinder part and the outer cylinder part. A plurality of connecting portions extend radially between the inner tube portion and the outer tube portion and are arranged to face each other at a predetermined distance in the circumferential direction between the inner tube portion and the outer tube portion. Further, a rigid insert member comprising a plurality of hollow portions adjacent to each other in the circumferential direction with the connecting portion interposed therebetween is at least one of the first rubber elastic body and the second rubber elastic body. The inner cylinder portion is disposed around the shaft member and has a diameter within the end opposite to the contact side with the first contact plate portion or the second contact plate portion. Embedded in the first rubber elastic body so as to be spaced apart outward in the direction. A thin-walled cylindrical radial compression rubber portion comprising a rubber elastic body portion positioned between the shaft member and the inner cylindrical portion of the insert member, and the insert An axial compression rubber portion made of a rubber elastic body portion opposite to the first connected body side with a member interposed therebetween, and a meat emptying space made of the plurality of hollow portions of the insert member were formed. A cylindrical anti-vibration support characterized by the above.   The cylindrical vibration-proof support according to claim 1, wherein the insert member is formed using a synthetic resin material.   The cylindrical anti-vibration support according to claim 1 or 2, wherein the connecting portion of the insert member has a plate shape.   The rubber elastic body in which the insert member is embedded is provided with a communication hole that allows the hollow portion of the insert member to communicate with the outside, and the hollow portion is opened toward the outside through the communication hole. The cylindrical vibration-proof support body according to any one of claims 1 to 3.   The cylindrical shape according to any one of claims 1 to 4, wherein inner corners on both sides in the axial direction of the inner cylindrical portion of the insert member are curved corner portions formed of convex curved surfaces. Anti-vibration support.   The insert member according to any one of claims 1 to 5, wherein the insert member is embedded in an end portion of the first rubber elastic body opposite to a contact side with the first contact plate portion. The cylindrical vibration-damping support according to item 1.   One of the axial compression rubber portions of the first rubber elastic body is extended from the first connected body side toward the second connected body side on the outer peripheral portion of the first contact plate portion. A cylindrical portion that surrounds the portion from the outside is integrally provided, and an outer flange portion is integrally formed on the outer cylindrical portion of the insert member, and the insert member is embedded in the first rubber elastic body. In this state, the outer flange portion is covered with a covering rubber portion integrally formed with the first rubber elastic body, and against the front end surface of the cylindrical portion of the first abutting plate portion. When the axial compression rubber of the first rubber elastic body is greatly compressed and deformed in the axial direction, the outer flange portion is interposed through the covering rubber portion. The first abutting plate portion being brought into contact with the tip end surface of the cylindrical portion. The cylindrical anti-vibration device according to claim 6, wherein the first coupled body and the second coupled body can be prevented from being excessively displaced relative to each other in the approaching direction. Support. The cylindrical anti-vibration support body according to any one of claims 1 to 7, wherein the first connected body to be anti-vibration connected and the second anti-vibration support body are arranged at a predetermined distance. And a structure to be attached in a state of being interposed between the first connected body and the second connected body,
The shaft member is inserted into the mounting hole provided in the first connected body, and the insert member of the first rubber elastic body and the second rubber elastic body is embedded. In the state where the embedded portion of the insert member is disposed inside the mounting cylinder portion integrally formed so as to extend in the circumferential direction of the mounting hole with respect to the mounting portion, the first rubber elastic body and the By sandwiching the first connected body between the second rubber elastic body, the first rubber elastic body is interposed between the first connected body and the second connected body. And interposing the first and second rubber elastic bodies with the first rubber elastic body based on the clamping force between the first rubber elastic body and the second rubber elastic body with respect to the first connected body. And the first contact plate portion is brought into contact with the second connected body. In the above, the shaft member is attached to the second connected body at the end opposite to the first rubber elastic body side with the first contact plate portion interposed therebetween. A mounting structure for a cylindrical anti-vibration support characterized by the above.

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