JP2009216135A - Automobile cylindrical vibration isolator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automobile cylindrical vibration isolator having a novel structure in which degree of freedom in designing a spring property is greatly obtained to facilitate manufacturing and mounting on an automobile. <P>SOLUTION: A main rubber elastic body 16 is vulcanized and adhered to tapered inner peripheral surfaces 34, 36 of an outer cylindrical member 14, Opposed recesses 42a, 42b for spring adjusting are formed in a portion where a projection height from the tapered inner peripheral surfaces 34, 36 in the main rubber elastic body 16 is decreased. A pair of inner splits 18, 20 is inserted from axial both sides of the outer cylindrical members 14 to be mutually connected and fixed so as to form an inner shaft member 12. Tapered outer peripheral surfaces 24, 30 of the inner splits 18, 20 are brought in contact with the inner peripheral surface of the main rubber elastic body 16, so that the inner shaft member 12 and the outer cylindrical member 14 are elastically connected via the main rubber elastic body 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, the inner shaft member and the outer cylindrical member spaced apart on the outer peripheral side of the inner shaft member are elastically connected by a pair of tapered cylindrical rubber elastic bodies whose diameter decreases from both axial sides toward the center. The present invention relates to a tubular vibration isolator for automobiles.

  2. Description of the Related Art Conventionally, as a type of vibration isolator such as an anti-vibration coupling body or an anti-vibration support body interposed between members of a vibration transmission system, for example, Japanese Patent Application Laid-Open No. 07-158676 is disclosed. Such a cylindrical vibration isolator is known. In such a cylindrical vibration isolator, the inner metal fitting and the outer cylindrical metal fitting that are spaced apart from each other in the radial direction are elastically connected to each other by a cylindrical rubber elastic body interposed therebetween. When the cylindrical vibration isolator is employed in an automotive cylindrical vibration isolator such as an automobile suspension bush or suspension member mount and is mounted on the automobile, the axial direction or the axis perpendicular direction of the cylindrical anti-vibration apparatus Is set for an automobile so that desired spring characteristics such as a longitudinal direction of the vehicle, a lateral direction, and a vertical direction can be obtained.

  By the way, in the above-mentioned automotive cylinder vibration isolator, spring characteristics in the axial direction and the direction perpendicular to the axis are required separately. Therefore, in the cylindrical vibration isolator as shown in FIG. 7 of Patent Document 2 (Japanese Patent Laid-Open No. 03-287405), as a rubber elastic body disposed between the inner metal fitting and the outer metal fitting, from both sides in the axial direction. There has been proposed a structure in which a pair of tapered cylindrical rubbers that are gradually reduced in diameter toward the central portion in the axial direction are assembled in the axial direction. In particular, when such a tapered cylindrical rubber is employed, the centering action of the inner metal fitting and the outer cylinder fitting by the tapered surface is exhibited. As a result, for example, when a cylindrical vibration isolator is applied to a suspension member mount, the stability of the vehicle behavior during full braking or sudden acceleration is likely to be a problem. The effect of improving the stability of vehicle behavior can be expected.

  However, the conventional cylindrical vibration isolator provided with such a tapered cylindrical rubber has the following two problems.

  First, when adjusting the spring characteristics in the direction perpendicular to the axis, it is difficult to form a straight through hole in the tapered cylindrical rubber as disclosed in Patent Document 3 (Japanese Patent Laid-Open No. 2004-239375). was there. This is because, even if the cover and the tapered cylindrical rubber have a split structure in the axial direction, the inner metal fitting and the outer cylindrical metal fitting have a tapered shape, so that it is difficult to perform die cutting in the axial direction.

  In addition, the second problem is that the mounting hole for the cylindrical vibration isolator to the automobile itself also requires a special shape of a double-sided taper shape that gradually decreases in diameter from the opening portion on both sides in the axial direction toward the central portion in the axial direction. There is to be. Therefore, in addition to the difficulty of forming the mounting hole itself, the cylindrical vibration isolator is composed of a pair of divided bodies obtained by dividing the inner metal fitting, the outer cylinder fitting, and the tapered cylindrical rubber in the axial direction. Thus, it is necessary to insert the pair of divided bodies from both sides of the mounting hole and to insert the inner rods into the two divided bodies to fix the divided bodies to each other. There was a problem that the installation work of was troublesome.

JP 07-158676 A Japanese Patent Laid-Open No. 03-287405 JP 2004-239375 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is that a large degree of freedom in design of spring characteristics is ensured, and manufacturing and mounting work on an automobile are performed. It is an object of the present invention to provide a tubular anti-vibration device for a car having a novel structure that facilitates the above.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. Further, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

  That is, the present invention is characterized in that a press-fit outer peripheral surface that is press-fitted into a mounting hole having a cylindrical inner peripheral surface and a tapered inner peripheral surface that gradually decreases in diameter from both axial opening portions toward the central portion in the axial direction. An outer cylinder member having a main rubber elastic body vulcanized and bonded to taper inner peripheral surfaces on both axial sides of the outer cylinder member. On the outer circumferential surface of the outer cylindrical member, an opposing recess for adjusting the spring is formed in which the protruding height from the tapered inner circumferential surface to the radially inner side is reduced at the portion opposed to the radial inner surface on the tapered inner circumferential surface. The inner shaft member is configured by inserting inner divided bodies having tapered outer peripheral surfaces corresponding to the tapered inner peripheral surfaces on both axial sides from both axial sides and fixing the inner divided bodies to each other. The The inner shaft member is in contact with the outer cylinder member by the taper outer peripheral surface of each inner divided member constituting the inner shaft member being brought into contact with the inner peripheral surface of the main rubber elastic body. It exists in the cylindrical vibration isolator for motor vehicles elastically connected through the elastic body.

  In the automotive cylindrical vibration isolator having the structure according to the present invention as described above, the main rubber elastic bodies are vulcanized and bonded to the taper inner peripheral surfaces on both axial sides of the outer cylindrical member, respectively. A pair of tapered cylindrical body rubbers in which the inner shaft member and the outer cylindrical member are reduced in diameter from both sides in the axial direction toward the center by the inner peripheral surface of the body being in contact with the tapered outer peripheral surface of each inner divided body It can be elastically connected via an elastic body. That is, it is not necessary to vulcanize and mold the main rubber elastic body so that it is fixed on both surfaces between the taper outer peripheral surface of the inner shaft member and the taper inner peripheral surface of the outer cylinder member. Can be simplified, and it is easy to manufacture a cylindrical vibration isolator in which an inner shaft member and an outer cylinder member are connected by a pair of tapered cylindrical main rubber elastic bodies, and the main rubber elastic body and inner shaft The design freedom of the member and the outer cylinder member is greatly ensured.

  In particular, based on the improvement in the degree of freedom in design on the inner peripheral surface side of the main rubber elastic body due to the fact that the inner peripheral surface of the main rubber elastic body is not vulcanized and bonded to the inner shaft member, The outer projecting height of the outer cylinder member in the radial direction from the taper inner peripheral surface is reduced to form an opposing recess for spring adjustment. As a result, it is possible to tune the spring characteristics while simplifying the die-cutting structure as compared with the case where a recess is formed in the radially intermediate portion of the main rubber elastic body and the outer peripheral surface vulcanized and bonded to the outer cylindrical member. The degree of freedom can be improved.

  Further, since the outer peripheral surface of the outer cylindrical member is a press-fit outer peripheral surface that is press-fitted and fixed in a mounting hole having a cylindrical inner peripheral surface, the mounting hole has a tapered shape or the like for mounting a cylindrical vibration isolator. Therefore, the mounting hole can be easily manufactured.

  Further, when the tapered outer peripheral surfaces of the pair of inner divided bodies are brought into contact with the inner peripheral surface of the main rubber elastic body, the inner shaft member and the outer are utilized by utilizing the axial assembly force of the pair of inner divided bodies. It is also possible to pre-compress the main rubber elastic body between the opposing surfaces of the cylindrical member. Thereby, the durability of the main rubber elastic body can be improved while shortening the manufacturing process.

  Therefore, according to the tubular anti-vibration device for automobiles of this structure, a large degree of freedom in design of spring characteristics is ensured, and excellent anti-vibration performance, vehicle riding comfort, driving stability, etc. can be obtained according to the purpose. In addition, it is possible to facilitate manufacture of a cylindrical vibration isolator having a pair of tapered cylindrical main rubber elastic bodies and installation work on an automobile.

  Moreover, in the cylindrical vibration isolator for automobiles according to the present invention, a structure provided with fixing means for fixing the pair of inner divided bodies to each other may be adopted. According to such a structure, an inner shaft member formed by integrally assembling a pair of inner divided bodies is realized in a single state before the cylindrical vibration isolator is mounted on the automobile. The handleability of the cylindrical vibration isolator is improved, and the mounting work on the automobile is further facilitated.

  In the automotive cylindrical vibration isolator according to the present invention, the outer peripheral surface of the outer cylindrical member includes a pair of annular press-fitting surfaces extending in the circumferential direction at both end portions in the axial direction, and a pair of annular press-fitting at a plurality of locations on the circumference. A straight press-fit surface extending in the axial direction across the surfaces, and a region that is surrounded by the pair of annular press-fit surfaces and the plurality of straight press-fit surfaces is a meat that opens to the press-fit outer peripheral surface. A structure in which a recess is formed may be employed. According to such a structure, as a result of reducing the contact area between the outer peripheral surface of the outer cylindrical member and the inner peripheral surface of the mounting hole, the load required for press-fitting the outer cylindrical member is reduced. The mounting operation can be further facilitated.

  In particular, in this structure, by providing a pair of annular press-fitting surfaces extending in the circumferential direction at both axial end portions of the press-fitting outer peripheral surface, for example, the projections or recesses that extend in the axial direction are separated in the circumferential direction. Compared to the outer peripheral surface provided only in a plurality, it is possible to ensure a large resistance to the outer cylinder member from coming off from the mounting hole. In addition, since the outer cylindrical member is press-fitted into the mounting hole from the annular press-fitting surface, the end of the mounting hole or the like is formed at the axial end of the linear press-fitting surface having a smaller circumferential dimension than the annular press-fitting surface Problems such as greatly damaging the inner peripheral surface of the cylinder are eliminated, and the durability of the outer cylinder member and the mounting hole can be ensured. Furthermore, the axial end of the gap formed between the hollow recess of the outer cylinder member and the cylindrical inner peripheral surface of the mounting hole can be closed with, for example, an annular press-fitting surface superimposed on the cylindrical inner peripheral surface. Thereby, the invasion of foreign matter into the gap is suppressed. Therefore, according to this structure, the mounting operation is further facilitated while stabilizing the mounting state of the outer cylinder member in the mounting hole.

  In addition, it is desirable that the outer cylindrical member provided with such a hollow recess and a pair of tapered inner peripheral surfaces is formed of a die-cast product using an aluminum light alloy or the like, thereby enabling dimensional accuracy and strength, The production efficiency can be improved. In addition, in the die-cast product in which the cutout recess is formed, the outer cylinder member is die-cast molded in addition to being able to achieve weight reduction and cost reduction based on the reduced thickness of the die-cast product. At this time, high dimensional accuracy can be maintained by suppressing the occurrence of so-called nests in which bubbles are generated inside the die-cast product due to insufficient pressure of the molten material.

  In the automotive cylindrical vibration isolator according to the present invention, the outer cylindrical member is provided with a central annular press-fitting surface that extends in the circumferential direction at the central portion in the axial direction and connects a plurality of linear press-fitting surfaces to each other. A structure may be adopted. According to such a structure, the generation of excessive stress in the formation portion of each linear press-fitting surface of the outer cylindrical member is suppressed, so that the mounting stability of the outer cylindrical member provided with the hollow recess in the mounting hole is improved. Can be improved.

  Further, in the automotive vibration isolator according to the present invention, the tapered outer peripheral surface of the inner divided body is positioned at the axially outer end of the contact area of the main rubber elastic body, and the inclination angle is increased. A structure in which a stepped positioning portion extending in the circumferential direction is formed may be employed. According to such a structure, when the inner peripheral surface of the main rubber elastic body is brought into contact with the tapered outer peripheral surface of the inner divided body, the axially outer end portion of the main rubber elastic body is supported by the positioning portion. Therefore, along with the elastic deformation of the main rubber elastic body, the axially outer end portion thereof is prevented from protruding excessively outward in the axial direction, and the change in spring characteristics and the decrease in durability caused by the protrusion are suppressed. The problem can be solved.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described. First, FIG. 1 shows a suspension member mount 10 for an automobile as a first embodiment according to the tubular vibration isolator for an automobile of the present invention. In the suspension member mount 10 for an automobile, an inner cylinder fitting 12 as an inner shaft member and an outer cylinder fitting 14 as an outer cylinder member are disposed at a predetermined distance in the radial direction and are interposed therebetween. The main rubber elastic body 16 is elastically connected.

  For example, as shown in FIG. 1 of Patent Document 2 (Japanese Patent Laid-Open No. 03-287405), such a suspension member mount 10 for automobiles has suspension members (subframes) as suspension arms and links. It can be employed for a well-known subframe type suspension device that is attached to the vehicle body. The inner cylinder fitting 12 is attached to the attachment member on the vehicle body side, and the outer cylinder fitting 14 is attached to the suspension member, so that the suspension member is supported by the vehicle body via the suspension member mount 10 for vibration isolation. (See FIG. 9).

  FIG. 1 shows a state in which the automobile suspension member mount 10 is not attached to the automobile. However, in the state in which the automobile suspension member mount 10 is attached to the automobile, the vehicle body or the like is substantially in the mount axis direction (up and down in FIG. 1). As the main rubber elastic body 16 is elastically deformed by being subjected to this shared support load, the inner cylinder fitting 12 is displaced with respect to the outer cylinder fitting 14 in the mount axis direction. In the following description, unless otherwise specified, the vertical direction refers to the vertical direction in FIGS.

  More specifically, the inner cylinder fitting 12 includes a first inner cylinder fitting 18 as one inner divided body and a second inner cylinder fitting 20 as the other inner divided body. As shown in FIGS. 2 and 3, the first inner cylindrical fitting 18 has a thick and small-diameter substantially cylindrical shape. An inner flange-like portion 22 that projects radially inward from the inner wall portion is integrally formed at the upper end portion of the first inner cylindrical metal fitting 18. Also, the outer peripheral surface from the upper end portion in the axial direction or the middle portion to the lower end edge portion of the first inner cylindrical metal fitting 18 is a first tapered outer peripheral surface 24 as a tapered outer peripheral surface that gradually decreases in diameter downward. Yes.

  As shown in FIGS. 4 and 5, the second inner cylindrical fitting 20 is a thick and small-diameter substantially cylindrical body extending in the axial direction in the longitudinal direction, and the axial direction from the upper end portion in the axial direction. A portion extending from the substantially central portion is a press-fit fixing portion 26 extending in a substantially constant circular cross section in the axial direction, and a portion from the lower end portion in the axial direction to the substantially central portion in the axial direction is gradually reduced in diameter. Part 28. That is, the second tapered outer peripheral surface 30 as the tapered outer peripheral surface that gradually decreases in diameter upward in the second inner cylindrical metal fitting 20 is constituted by the outer peripheral surface of the tapered cylindrical portion 28, and The second inner cylindrical metal fitting 20 has the maximum outer diameter dimension at the large-diameter side edge of the tapered cylindrical portion 28 located at the lower end of the metal fitting 20. The axial dimensions of the press-fit fixing portion 26 and the tapered cylindrical portion 28 are substantially the same, and the axial dimension of the entire second inner cylindrical fitting 20 is larger than the axial dimension of the first inner cylindrical fitting 18. It has been enlarged. Further, the outer diameter dimension of the press-fit fixing portion 26 is slightly smaller than the inner diameter dimension of the first inner cylindrical metal fitting 18, and the second tapered outer peripheral surface 30 is the large-diameter side edge. The outer diameter dimension of the lower end edge portion of the second inner cylindrical metal fitting 20 is substantially the same as the outer diameter dimension of the upper end portion of the first inner cylindrical metal fitting 18 provided with the large diameter side end portion of the first tapered outer peripheral surface 24. ing. Further, the inner diameter dimension of the press-fit fixing portion 26 is set to be substantially the same as or smaller than the inner diameter dimension of the inner flange-shaped portion 22 of the first inner cylindrical fitting 18. Further, a step portion 32 that protrudes radially inward toward the inner flange is formed at a substantially central portion in the axial direction of the second inner tubular fitting 20 located at the connection portion between the press-fit fixing portion 26 and the tapered tubular portion 28. Are integrally formed.

  On the other hand, the outer cylinder fitting 14 has a large-diameter substantially cylindrical shape as shown in FIGS. The outer cylinder member to be the outer cylinder fitting 14 may be a hard resin molded product using polyphenylene sulfide (PPS), polyamide (PA), etc., in addition to a press molded product using, for example, a pressed steel plate, In particular, in this embodiment, it consists of a die-cast product using an aluminum alloy or a zinc alloy.

  The inner peripheral surface of the outer cylindrical metal member 14 includes a first tapered inner peripheral surface 34 and a second tapered inner peripheral surface 32 as tapered inner peripheral surfaces. These first and second taper inner peripheral surfaces 34, 36 have taper shapes that gradually decrease in diameter from the both side edge portions in the axial direction of the outer cylindrical fitting 14 toward the central portion in the axial direction. The end portions on the small diameter side of the second tapered inner peripheral surfaces 34 and 36 are positioned at a predetermined distance in the axial direction at the intermediate portion in the axial direction of the outer cylindrical metal member 14. As a result, a cylindrical surface extending in the axial direction is formed between the end portions on the small diameter side of the first and second tapered inner peripheral surfaces 34, 36 on the inner peripheral surface of the outer cylinder fitting 14, and this cylindrical surface is provided. The inner diameter dimension of the axial direction intermediate part of the outer cylinder metal fitting 14 is made the smallest. In particular, in the present embodiment, the first taper inner peripheral surface 34 and the second taper inner peripheral surface 36 are substantially the same with respect to the taper angle represented by the angle at which the generatrix of the taper surface is inclined with respect to the central axis of the outer cylindrical metal fitting 14. It is the same. Further, the axial dimensions of the first taper inner peripheral surface 34 and the second taper inner peripheral surface 36 are substantially the same. Thereby, while the 1st taper inner peripheral surface 34 and the 2nd taper inner peripheral surface 36 are made into the symmetrical shape in an axial direction, the axial direction of the 1st and 2nd taper inner peripheral surfaces 34 and 36 in the outer cylinder metal fitting 14 is carried out. The minimum inner diameter portion positioned between them is positioned at a substantially central portion in the axial direction of the outer cylinder fitting 14. Of course, the axial dimensions and taper angles of the first and second taper inner peripheral surfaces 32 and 34 can be made different from each other according to the required spring characteristics, manufacturability, etc. The minimum inner diameter portion of the outer cylindrical metal member 14 may be biased toward one side in the axial direction, or the first tapered inner peripheral surface 34 and the second tapered inner peripheral surface 36 may be asymmetric in the axial direction.

  The first taper inner peripheral surface 34 and the second taper inner peripheral surface 36 are provided with a first main rubber elastic body 38 and a second main rubber elastic body 40 constituting the main rubber elastic body 16.

  The first main rubber elastic body 38 is formed in a cylindrical shape extending in the circumferential direction with a substantially constant rectangular cross section along the first tapered inner peripheral surface 34, and with respect to the central axis of the outer cylindrical fitting 14 on the inner and outer peripheral surfaces thereof. Each inclination angle is substantially the same as the taper angle of the first taper inner peripheral surface 34. In addition, the axial section of the first main rubber elastic body 38 changes from the outer peripheral surface to the inner peripheral surface under the single state of the outer cylindrical metal member 14 before the inner cylindrical metal member 12 and the outer cylindrical metal member 14 are elastically connected to each other. It is made into the substantially trapezoid shape where a width dimension becomes small gradually toward it. The outer peripheral surface of the first main rubber elastic body 38 is vulcanized and bonded to the first tapered inner peripheral surface 34.

  Furthermore, a first groove portion 42a serving as a concavity is formed in a portion of the first main rubber elastic body 38 that is opposed to one another in the radial direction (up and down in FIG. 6) across the central axis of the outer cylinder fitting 14. Are formed respectively. The first groove 42a is formed in the radial direction of the first main rubber elastic body 38 by reducing the height of the first main rubber elastic body 38 protruding radially inward from the first tapered inner peripheral surface 34. It is a cross section in the axial direction that opens in the direction and opens in the upper and lower end surfaces of the first main rubber elastic body 38, and extends in the circumferential direction with a length of a little less than half. In particular, in the present embodiment, the first main rubber elastic body 38 is not provided on the first tapered inner peripheral surface 34 when the first groove portion 42a is configured. That is, the first main rubber elastic body 38 having a cylindrical shape is formed with a pair of first groove portions 42a and 42a spaced apart in the circumferential direction, so that the first main rubber elastic body 38 is A pair of substantially arc-shaped block shapes substantially divided in the circumferential direction are formed.

  On the other hand, the second main rubber elastic body 40 axially extends the first main rubber elastic body 38 that is vulcanized and bonded to the first taper inner peripheral surface 34 of the outer cylinder fitting 14 (up and down in FIGS. 1 and 7). And the first main rubber elastic body 38 is substantially symmetric to each other, and each inclination angle with respect to the central axis of the outer cylindrical fitting 14 on the inner and outer peripheral surfaces of the second main rubber elastic body 40 is The taper angle of the second taper inner peripheral surface 36 of the outer cylinder fitting 14 is substantially the same. Therefore, under the single state of the outer cylindrical metal fitting 14, the axial cross section of the second main rubber elastic body 40 is formed into a substantially trapezoidal shape in which the width dimension gradually decreases from the outer peripheral surface toward the inner peripheral surface. The outer peripheral surface of the rubber elastic body 40 is vulcanized and bonded to the second tapered inner peripheral surface 36. In addition, the second main rubber elastic body 40 is not provided at a portion of the second tapered inner peripheral surface 36 that is opposed to each first groove 42a of the first main rubber elastic body 38 in the axial direction. The second main body rubber elastic body 40 is provided with second groove portions 42b as opposing recesses, whereby the second groove portions 42b and 42b are arranged in a radial direction with the central axis of the outer cylinder fitting 14 interposed therebetween. The second main rubber elastic body 40 is opposed to each other in the direction (up and down in FIG. 6), and has a pair of substantially arc-shaped block shapes substantially divided in the circumferential direction.

  In short, the main rubber elastic body 16 composed of the first main rubber elastic body 38 and the second main rubber elastic body 40 is integrally vulcanized and molded together with the outer cylinder fitting 14, so that the first and second of the outer cylinder fitting 14 are first and second. Based on the fact that it is vulcanized and bonded to the taper inner peripheral surfaces 34 and 36, it is configured as an integrally vulcanized molded product provided with the outer cylinder fitting 14.

  In particular, in the present embodiment, the outer peripheral surface of the outer tubular fitting 14 extends in the axial direction across a pair of annular press-fit surfaces 44, 44 extending in the circumferential direction at both axial end portions and the pair of annular press-fit surfaces 44, 44. The press-fitting outer peripheral surface 48 includes a plurality of linear press-fitting surfaces 46 that extend. The press-fit outer peripheral surface 48 is formed on, for example, a cylindrical outer peripheral surface that is opposed to the first taper inner peripheral surface 34 or the second taper inner peripheral surface 36 in the radial direction when the outer cylinder fitting 14 is die-cast. It can be suitably realized by forming a plurality of cutout recesses 50.

  In other words, the hollow recess 50 has both axial end edges positioned axially inward from the axial both end edges of the outer tube fitting 14, and extends with a substantially constant axial dimension in the circumferential direction. It has a form that is opened in a substantially rectangular shape with respect to the cylindrical outer peripheral surface. A plurality of such cutout recesses 50 are formed at equal intervals in the circumferential direction of the outer cylinder fitting 14.

  Thereby, between each axial direction edge part of the outer cylinder metal fitting 14 and the axial direction edge part of each hollow recess 50, the cyclic | annular press fit extended in the circumferential direction with a respectively substantially constant axial dimension, respectively. A surface 44 is formed, and these annular press-fitting surfaces 44, 44 constitute both axial end portions of the press-fitting outer peripheral surface 48. In addition, a linear press-fit surface 46 extending in the axial direction with a substantially constant circumferential dimension is formed between the circumferential edge portions of each pair of adjacent hollow recesses 50 and 50 in the circumferential direction. Since each axial press-fit surface 46 is in contact with each annular press-fit surface 44 so as to be substantially orthogonal to each other, each linear press-fit surface 46 is located between the pair of annular press-fit surfaces 44, 44. Extending in the axial direction. In the present embodiment, based on the fact that a plurality of the hollow recesses 50 are formed at equal intervals in the circumferential direction of the outer cylinder fitting 14, a plurality of the linear press-fit surfaces 46 are also equally spaced in the circumferential direction of the outer cylinder fitting 14. Is formed.

  In other words, in the press-fitting outer peripheral surface 48 of the outer cylindrical metal member 14, the region surrounded by the pair of linear press-fitting surfaces 46, 46 adjacent to the pair of annular press-fitting surfaces 44, 44 in the circumferential direction has an outer periphery. A hollow recess 50 that is open to the surface is formed, and includes a pair of annular press-fit surfaces 44, 44, a plurality of linear press-fit surfaces 46, and a plurality of hollow recesses 50. The outer peripheral surface is constituted. In addition, in the outer tube fitting 14 of the present embodiment, the entire inner peripheral surface has a bent shape that protrudes radially inward by the first and second tapered inner peripheral surfaces 34, 36, and In particular, since the bottom surface of each of the hollow recesses 50 has a bent shape along the inner peripheral surface of the outer cylinder fitting 14, the radially inner portion of the outer cylinder fitting 14 is substantially the central portion in the axial direction. It is composed of a narrow cylindrical tubular portion 52 that is narrowed and narrowed. Further, between the axial end portions of the constricted cylindrical portion 52 in the outer tubular metal fitting 14, it rises radially outward from the outer peripheral surface of the constricted cylindrical portion 52 and uses the linear press-fit surface 44 as the outer peripheral surface, and both axial ends. The portion is constituted by a plurality of thin plate-like rib-shaped portions 54 formed by connecting the both ends of the cylindrical portion 52 in the axial direction. In other words, the outer tubular fitting 14 of the present embodiment has a structure in which the strength of the constricted tubular portion 52 is supplemented by a plurality of rib-shaped portions 54 formed at equal intervals in the circumferential direction. As shown in FIGS. 1 and 7, the end portion in the axial direction of the constricted cylindrical portion 52 is reinforced by a thick structure having an outer flange-like rib. An annular press-fit surface 44 is configured by a radially outwardly protruding front end surface at the direction end.

  Further, in the present embodiment, the lateral rib-like portion 56 is formed radially outward from the center bottom surface of the hollow recess 50 of the outer tubular metal fitting 14, that is, the outer peripheral surface of the substantially central portion in the axial direction of the constricted tubular portion 52. Projected. The lateral rib-like portion 56 is integrally formed with the tubular portion 52 and the flanged rib-like portion 54 by die-casting of the outer tubular fitting 14, and has a substantially arcuate plate shape in which the circumferential dimension increases radially outward. The inner peripheral edge in the radial direction is in contact with the constricted cylindrical part 52, and both end edges in the circumferential direction are in contact with the circumferential end of the substantially central part in the axial direction of each rib-shaped part 54. . As a result, the pair of rib-shaped portions 54, 54 adjacent to each other in the circumferential direction are connected to each other via the lateral rib-shaped portion 56.

  In particular, in the present embodiment, the radially outer peripheral surface of the lateral rib-like portion 56 is curved in a substantially arc shape along a circle centered on the central axis of the outer cylindrical fitting 14, and the press-fit outer circumference of the outer cylindrical fitting 14 It is positioned radially inward from the annular press-fit surface 44 and the linear press-fit surface 46 constituting the surface 48. That is, the lateral rib-like portion 56 of the present embodiment is formed on the outer cylindrical metal member 14 so as to be held inward in the radial direction from both axial ends of the constricted tubular portion 52 and the rib-like rib portion 54. In addition, the thickness dimensions of the constricted tubular portion 52, the rib-like rib portion 54, and the lateral rib-like portion 56 are substantially the same.

  When assembling the inner cylinder fitting 12 composed of the first inner cylinder fitting 18 and the second inner cylinder fitting 20 to the integrally vulcanized molded product of the main rubber elastic body 16 provided with such an outer cylinder fitting 14, The inner cylinder fitting 18 and the second inner cylinder fitting 20 are inserted from both sides of the outer cylinder fitting 14 in the axial direction, and are respectively displaced toward the axial center of the outer cylinder fitting 14. Then, the inner peripheral surface of the first main rubber elastic body 38 is overlapped with the first tapered outer peripheral surface 24 of the first inner cylindrical metal member 18, so that the first inner cylindrical metal member 18 is in the axial direction of the outer cylindrical metal member 14. By being further displaced toward the center, the first main rubber elastic body 38 is located between the first tapered outer peripheral surface 24 of the first inner tubular fitting 18 and the first tapered inner peripheral surface 34 of the outer cylindrical fitting 14. It is compressed and deformed. On the other hand, the inner peripheral surface of the second main rubber elastic body 40 is overlapped with the second tapered outer peripheral surface 30 of the second inner cylindrical metal member 20, so that the second inner cylindrical metal member 20 is in the axial direction of the outer cylindrical metal member 14. Based on the further displacement toward the center, the second main rubber elastic body 40 is formed on the second tapered outer peripheral surface 30 of the second inner cylindrical metal member 20 and the second tapered inner peripheral surface 36 of the outer cylindrical metal member 14. Compressed and deformed between.

  Further, as the first inner cylindrical fitting 18 and the second inner cylindrical fitting 20 are inserted from both sides in the axial direction of the outer cylindrical fitting 14, they are displaced in directions approaching each other in the axial direction. A press-fit fixing portion 26 located at the tip in the insertion direction of the inner cylindrical metal fitting 20 is press-fitted and fixed to the first inner cylindrical metal fitting 18. The upper end surface of the press-fit fixing portion 26 is overlapped with the lower end surface of the inner flange-shaped portion 22 of the first inner cylindrical fitting 18 so that the second inner cylindrical fitting 20 is press-fitted into the first inner cylindrical fitting 18. The end is defined. As a result, the first inner cylinder fitting 18 and the second inner cylinder fitting 20 are connected and fixed to each other in the axial direction to form an integral inner cylinder fitting 12.

  In addition, the inner cylinder fitting 12 is configured, and the first main rubber elastic body 38 and the second main rubber elastic body 40 are formed by the first tapered inner and outer peripheral surfaces 24 and 34 and the second tapered inner and outer peripheral surfaces 30 and 36. A state of being compressed and deformed in between is maintained. That is, each elastic action of the first main rubber elastic body 38 and the second main rubber elastic body 40 which are compressed and deformed in the direction in which the first and second inner cylindrical fittings 18 and 20 are close to each other in the axial direction. As a result, an acting force is exerted on the first inner cylindrical fitting 18 and the second inner cylindrical fitting 20 in a direction in which they are displaced away from each other in the axial direction. And the second inner cylindrical metal fitting 20 have an axial press-fit fixing force that is sufficiently larger than the acting force, so that the first and second inner cylindrical metal fittings 18 and 20 are mutually connected in the axial direction. Is prevented from being displaced by a distance from each other.

  Accordingly, the first and second inner cylindrical fittings 18 are provided between the opposing surfaces of the first tapered inner and outer circumferential surfaces 24 and 34 and the second tapered inner and outer circumferential surfaces 30 and 36 in the inner cylindrical fitting 12 and the outer cylindrical fitting 14. , 20 are provided with a first main rubber elastic body 38 and a second main rubber elastic body 40 which are pre-compressed in a direction in which the two main body rubber elastic bodies 40 approach each other in the axial direction. The inner cylinder fitting 12 and the outer cylinder fitting 14 are elastically connected to each other through the main rubber elastic body 16 including the rubber elastic bodies 38 and 40. Particularly, the inner cylinder fitting 12 and the outer cylinder fitting 14 are positioned substantially concentrically with each other on the basis of the taper action of the first and second tapered inner and outer peripheral surfaces 24, 30, 34, 36. The centering function is working.

  The first and second tapered outer peripheral surfaces 24 and 30 of the inner cylindrical metal member 12 are in contact with the inner peripheral surfaces of the first and second main rubber elastic bodies 38 and 40, thereby providing the outer cylindrical metal member 14. The radially inward opening of the first and second groove portions 42a and 42b in the integrally vulcanized molded product of the main rubber elastic body 16 is formed by the first and second tapered outer peripheral surfaces 24 and 30 of the inner cylinder fitting 12. Covered. In the present embodiment, the first and second groove portions 42a and 42b, and the first and second tapered outer peripheral surfaces 24 and 30 of the inner tube fitting 12 cover the radial openings of the first and second groove portions 42a and 42b. Each of the first groove portions 42a of the first main rubber elastic body 38 and the second main rubber elastic body 40 between the caulking portion and the radially opposing surfaces at the approximate center in the axial direction of the inner cylinder fitting 12 and the outer cylinder fitting 14. The first and second main body rubber elasticity in one radial direction (the paper surface direction in FIG. 1) across the central axis of the mount 10 in cooperation with the portion where the second groove portion 42b is opposed to the axial direction. A pair of straight portions extending through the main rubber elastic body 16 including the bodies 38 and 40 in the axial direction are formed. As a result, the spring constant in one radial direction in which the pair of straight portions are formed is sufficiently smaller than the spring constant in the direction orthogonal to the one radial direction (left and right in FIG. 1).

  In particular, in the present embodiment, the mount 10 (first inner cylindrical metal fitting of the first taper outer peripheral surface 24 is related to the taper angle represented by the angle at which the generatrix of the taper surface is inclined with respect to the central axis of the suspension member mount 10 for an automobile. 18) and the taper angle of the first taper inner peripheral surface 34 with respect to the center axis of the mount 10 (outer tube fitting 14) are substantially the same, and the first taper outer peripheral surface 24 is the first taper inner periphery. The shape corresponding to the surface 34, and the taper angle of the second taper outer peripheral surface 30 with respect to the center axis of the mount 10 (second inner cylindrical metal fitting 20) and the mount 10 (outer tube) of the second taper inner peripheral surface 36 The taper angle with respect to the central axis of the metal fitting 14) is substantially the same, and the second taper outer peripheral surface 30 has a shape corresponding to the second taper inner peripheral surface 36. Further, the taper angles of the first tapered inner and outer peripheral surfaces 24 and 34 and the taper angles of the second tapered inner and outer peripheral surfaces 30 and 36 are substantially the same. Further, the rubber volume in the first main rubber elastic body 38 and the second main rubber elastic body 40 is substantially the same.

  In the automobile suspension member mount 10 having such a structure, the outer cylinder fitting 14 is fixed to the bracket fitting 58 when mounted on the automobile. As shown in FIG. 9, the bracket fitting 58 has a large-diameter cylindrical shape, and has an inner peripheral surface as a mounting hole 60 extending in a cylindrical shape in the axial direction. That is, in the present embodiment, the entire mounting hole 60 is a cylindrical inner peripheral surface. Further, an inner flange-shaped portion 62 is integrally formed at the lower end portion of the bracket fitting 58. The press-fit outer peripheral surface 48 of the outer cylinder fitting 14 is pressed into the mounting hole 60 of the bracket fitting 58 from above in the axial direction, and the lower end portion of the outer cylinder fitting 14 is positioned near the inner flange portion 62 of the bracket fitting 58. The outer tubular fitting 14 is fixed to the bracket fitting 58 by being overlapped with the inner flange-shaped portion 62 in the axial direction. By attaching or forming the bracket fitting 58 to the suspension member, the outer cylinder fitting 14 is attached to the suspension member.

  In particular, in the press-fitting of the outer cylinder fitting 14 into the bracket fitting 58 in the present embodiment, the outer fitting is pressed into the mounting hole 60 from the annular press-fitting surface 44 constituting the lower end of the press-fitting outer peripheral surface 48, and then in the circumferential direction of the press-fitting outer peripheral surface 48. The linear press-fitting surfaces 46 provided at equal intervals are also press-fitted into the mounting holes 60 from below to above. Further, in a state where the lower end portion of the outer cylinder fitting 14 is positioned at a predetermined position of the bracket fitting 58 and the press-fitting end is defined, the annular press-fitting surface 44 constituting the upper end of the press-fitting outer peripheral surface 48 is formed from the mounting hole 60. Is also located above, that is, it is not press-fitted into the mounting hole 60. In particular, based on the press-fitting and fixing, the annular press-fitting surface 44 at the lower end of the press-fitting outer peripheral surface 48 is in close contact with the mounting hole 60 over the entire circumference, so that each of the hollow recesses opened on the outer peripheral surface of the outer cylinder fitting 14 The lower opening of the place 50 is blocked by the annular press-fitting surface 44 and the inner peripheral surface of the mounting hole 60. Further, since the outer peripheral surface of each horizontal rib-like portion 56 in the outer cylindrical metal fitting 14 is positioned radially inward from the press-fit outer peripheral surface 48, it is not press-fitted into the mounting hole 60, and the mounting hole It is opposed to the inner circumferential surface of 60 with a predetermined distance in the radial direction.

  In addition, an insertion hole 66 is provided at a target fixing position of the inner cylinder fitting 12 in a part of the vehicle body 64 or an attachment member attached to the vehicle body 64, with respect to the periphery of the insertion hole 66. From the lower side, the upper end portion of the first inner cylindrical fitting 18 in the inner cylindrical fitting 12 is overlapped. Further, a long-axis-shaped fixing nut 70 provided with a screw hole 68 opened at the lower end surface is inserted through the insertion hole 66 from above the vehicle body 64 and the inner hole of the inner flange-shaped portion 22 of the first inner cylindrical metal member 18 and the first hole. It is inserted through the inner hole of the press-fit fixing portion 26 of the second inner cylindrical metal fitting 20. In addition, a hook-like portion 72 that extends outward in the direction perpendicular to the axis is integrally formed at an axially intermediate portion of the fixing nut 70, and the hook-like portion 72 is overlapped around the insertion hole 66 from above the vehicle body 64. ing. As a result, the insertion end of the fixing nut 70 into the automobile suspension bush 10 is defined, and the lower end surface of the fixing nut 70 is predetermined above the step portion 32 of the second inner tubular member 20 in the inner tubular member 12. It is located at a distance. Further, the long-axis-shaped fixing bolt 74 is inserted from below the second inner cylinder fitting 20 of the inner cylinder fitting 12, and the screw portion of the distal end portion (upper end portion) of the fixing bolt 74 in the insertion direction is The fixing nut 70 is screwed into a screw hole 68 opened in the front end surface (lower end surface) in the insertion direction, and the head of the fixing bolt 74 is overlapped with the step portion 32 of the second inner cylindrical metal fitting 20. Defines the screwing end of the fixing bolt 74 in the axial direction to the fixing nut 70. As a result, the first and second inner cylindrical fittings 18 and 20 are fixed so as to be sandwiched in the axial direction between the flange 72 of the fixing nut 70 and the head of the fixing bolt 74 via the vehicle body 64. The inner cylinder fitting 12 is fixed to the vehicle body 64.

  As a result, the suspension member mount 10 for an automobile is interposed between the vehicle body 64 and the suspension member and is attached to the automobile, and the suspension member is protected from the vehicle body 64 via the suspension member 10 for the automobile. It is supported by vibration. Under such a mounting state in the automobile, the axial direction of the mount 10 is the vehicle vertical direction (vertical direction in FIG. 9), and one radial direction in which the pair of curling portions are opposed to each other is the vehicle longitudinal direction ( In FIG. 9, a direction perpendicular to the one radial direction is a vehicle left-right direction (left-right direction in FIG. 9).

  In the suspension member mount 10 for an automobile according to the present embodiment, the first inner cylindrical fitting 18 and the second inner cylindrical fitting 18 are fixed as means for fixing the first inner cylindrical fitting 18 and the second inner cylindrical fitting 20 to each other. A press-fit fixing structure by a press-fit fixing portion 26 of the cylindrical metal fitting 20 is employed. In particular, the first inner cylindrical metal fitting 18 and the second inner inner metal fitting 18 are in a single state before the automobile suspension member mount 10 is mounted on the automobile. The cylindrical metal fitting 20 is displaced close to each other and press-fitted and fixed, so that the main rubber elastic body 16 including the first and second main rubber elastic bodies 38 and 40 is used by using such fixing force. Pre-compression is applied to form a suspension member mount 10 for an automobile. However, the present embodiment is not limited to this. For example, when the suspension member mount for an automobile is attached to the automobile, the step of press-fitting the outer cylinder fitting into the attachment hole, and the second inner cylinder fitting And the step of press-fitting and fixing the press-fit fixing portion to the first inner cylindrical fitting may be performed in any order, so that the suspension member mount for an automobile is configured at the same time as being mounted on the automobile. In addition, the first inner cylindrical fitting and the second inner cylindrical fitting are press-fitted and fixed to exert a predetermined pre-compression force on the main rubber elastic body. In accordance with the displacement, it is possible to further pre-compress the main rubber elastic body. That is, in the latter case, an assembly is obtained by elastically connecting the inner cylinder fitting and the outer cylinder fitting through the main rubber elastic body as shown in FIG. 1, and the assembly is attached to the automobile. As a result, a suspension member mount for an automobile in which a desired precompression force is applied to the main rubber elastic body at the same time as mounting is configured.

  In the suspension member mount 10 for an automobile of the present embodiment, the inner cylinder fitting 12 and the outer cylinder fitting 14 are elastically connected by a pair of tapered cylindrical main rubber elastic bodies 38 and 40 whose diameters are reduced from both axial sides toward the center. Therefore, the centering action of the inner cylinder fitting 12 and the outer cylinder fitting 14 by the tapered surface is exhibited. As a result, an effect of stabilizing the vehicle behavior can be achieved based on the centering action by the tapered surface during full braking or sudden acceleration.

  Therefore, in the present embodiment, the first and second main rubber elastic bodies 38 and 40 that elastically connect the inner cylinder fitting 12 and the outer cylinder fitting 14 to each other are provided inside the first and second tapers of the outer cylinder fitting 14. The peripheral surfaces 34 and 36 are vulcanized and bonded. Further, the inner cylinder fitting 12 has a divided structure including the first inner cylinder fitting 18 and the second inner cylinder fitting 20, and the first and second inner cylinder fittings 18, 20 are formed of the outer cylinder fitting 14. The inner peripheral surfaces of the first and second main rubber elastic bodies 38, 40 are brought into contact with the first and second tapered outer peripheral surfaces 24, 30 as they are inserted from both sides in the axial direction and connected and fixed to each other. By being caulked, the inner cylinder fitting 12 and the outer cylinder fitting 14 are elastically connected to each other via the first and second main rubber elastic bodies 38 and 40. This eliminates the need for vulcanization molding of the main rubber elastic body 16 between the opposing surfaces of the pair of metal fittings having the taper inner peripheral surface and the taper outer peripheral surface. At the same time, a large degree of design freedom for the main rubber elastic body 16, the inner cylinder fitting 12, and the outer cylinder fitting 14 is ensured.

  In addition, a pair of curving portions that tune the spring characteristics in the vehicle longitudinal direction and the lateral direction include the first and second groove portions 42a and 42b. Here, the first and second groove portions 42 a and 42 b are taper inner peripheral surfaces 34 of the outer cylinder fitting 14 in the main rubber elastic body 16 in the integrally vulcanized molded product of the main rubber elastic body 16 provided with the outer cylinder fitting 14. , 36, the first and second groove portions 42a, 42a, 42a are coupled with the simplification of the die cutting structure of the main rubber elastic body 16 described above. The design freedom of 42b can be dramatically improved. As a result, as illustrated, the first and second main rubber elastic bodies 38 have a straight portion between the opposing surfaces of the tapered inner peripheral surfaces 34 and 36 of the outer cylinder fitting 14 and the tapered outer peripheral surfaces 24 and 34 of the inner cylinder fitting 12. , 40 can also be adopted, so that the straight portion in the main rubber elastic body can be compared with the case where the straight portion is formed directly through the main rubber elastic body. Durability can be improved based on the fact that the stress concentration at the formation site of the material is reduced.

  Further, since the outer peripheral surface of the outer cylindrical metal member 14 is a press-fit outer peripheral surface 48 having a cylindrical appearance, a cylindrical shape as illustrated is adopted as the mounting hole 60 for the suspension member, and one axial direction of the mounting hole 60 is provided. As a result, the mounting structure of the outer cylinder fitting 14 to the suspension member can be simplified while the outer cylinder fitting 14 includes the tapered inner peripheral surfaces 34 and 36.

  Further, in the present embodiment, the first and second inner cylindrical fittings 18 and 20 are inserted from both axial sides of the outer cylindrical fitting 14 and are fixed to each other in the axial direction to constitute the inner cylindrical fitting 12. At the same time, the inner peripheral surfaces of the first and second main rubber elastic bodies 38 and 40 are brought into contact with the first and second tapered outer peripheral surfaces 24 and 30. At that time, the first and second main rubber elastic bodies 38 and 40 are made to have the first and second tapered outer peripheral surfaces by utilizing the axial assembly force of the first and second inner cylindrical fittings 18 and 20. The precompression force is exerted on the first and second main rubber elastic bodies 38, 40 by being pressed against 24, 30. As a result, it is not necessary to apply an excessive precompression force to the main rubber elastic body 16 at the same time as mounting the suspension member mount 10 for a vehicle to the vehicle, and the mounting operation becomes easy.

  Therefore, according to the suspension member mount 10 for an automobile of the present embodiment, a large degree of freedom in design of spring characteristics is ensured, and excellent vehicle riding comfort and handling stability can be obtained. Manufacture of the mount 10 provided with the first and second main rubber elastic bodies 38, 40 and mounting work on the automobile can be facilitated.

  In particular, in the present embodiment, a plurality of cutout recesses 50 are formed on the press-fit outer peripheral surface 48 of the outer cylinder fitting 14, and the press-fit outer peripheral surface 48 is configured by a plurality of linear press-fit surfaces 46 and an annular press-fit surface 44. Since the contact area of the press-fit outer peripheral surface 48 with respect to the mounting hole 60 is reduced, the load required for press-fitting is reduced, and the press-fitting work of the outer cylinder fitting 14 into the mounting hole 60 is further facilitated. .

  Further, the plurality of rib-shaped portions 54 having the linear press-fit surface 46 are connected to each other by the lateral rib-shaped portions 56 provided between the circumferential directions thereof, so that the lightening is performed. While the recess 50 is formed to reduce the thickness of the outer cylinder fitting 14, the strength can be suitably secured, and the attachment stability of the outer cylinder fitting 14 to the suspension member can be improved. As a result, the width of the linear press-fit surface 46 and the annular press-fit surface 44 can be designed to be smaller, and the press-fitting operation can be further facilitated.

  Furthermore, since the outer cylinder fitting 14 is formed of a die-cast product, it is relatively equipped with a plurality of surfaces such as the first and second tapered inner peripheral surfaces 34, 36, the annular press-fitting surface 44, and the linear press-fitting surface 46. Even when the outer cylindrical metal fitting 14 having a complicated shape is formed, in addition to being able to achieve mass production based on the ease of manufacturing work, improvement in dimensional accuracy and strength can be realized at a high level. Moreover, in order to form the plurality of surfaces in the outer cylindrical metal fitting 14, a constricted cylindrical part 52, a flanged rib part 54, and a lateral rib part 56 each having a small thickness are formed, and their thicknesses are formed. Since the height dimension is substantially the same throughout, the generation of nests in the die-cast product is suitably suppressed, and high dimensional accuracy can be realized.

  In addition, the radially outer peripheral surface of the lateral rib-like portion 56 is positioned radially inward from the press-fit outer peripheral surface 48 including the annular press-fit surface 44 and the linear press-fit surface 46, so that the press-fit outer peripheral surface 48. The increase in the contact area with respect to the mounting hole 60 can be suppressed, and the press-fitting operation can be facilitated, and the strength improvement of the outer cylinder fitting 14 by the lateral rib-like portion 56 can be achieved.

  However, the present invention is not limited to this, and for example, as shown in FIG. 10, the outer cylinder fitting 14 used in the automobile suspension member mount as the second embodiment of the present invention, Depending on the required strength and manufacturability of the outer cylinder fitting 14, press-fit workability into the mounting hole 60, etc., the radial outer peripheral surface of the lateral rib-like portion 56 is the same as the annular press-fit surface 44 and the straight press-fit surface 46. The outer cylindrical fitting 14 is formed as a central annular press-fitting surface 76 which is positioned at the radial position and connects the linear press-fitting surfaces 46 of the rib rib-like portions 54 located on both sides of the lateral rib-like portion 56 in the circumferential direction. A part of the press-fitting outer peripheral surface 48 may be configured. Further, the central annular press-fit surface 76 may extend continuously in the circumferential direction, or an appropriate place on the circumference of the central annular press-fit surface 76 as in this embodiment (in this embodiment, the central annular press-fit surface 76). By forming a notch-shaped recess 78 that opens radially outward in the substantially central portion of the circumferential direction of the outer periphery of the press-fitting portion, it is possible to suppress an increase in the contact area between the press-fit outer peripheral surface 48 and the mounting hole 60. . In the second embodiment and the following description, members and parts having substantially the same structure as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment. Detailed description thereof will be omitted.

  In addition, for example, as shown in FIG. 11, the suspension member mount 80 for an automobile according to the third embodiment of the present invention includes the first and second first and second inner cylindrical fittings 18 and 20. In the taper outer peripheral surfaces 24 and 30, the positioning protrusions 82 and 84 are positioned axially outward from the portions where the inner peripheral surfaces of the first and second main rubber elastic bodies 38 and 40 are in contact with each other. It may be formed. These positioning protrusions 82 and 84 are substantially triangular axial cross sections whose axial dimensions are reduced radially outward from the first and second tapered outer peripheral surfaces 24 and 30 and have a predetermined length in the circumferential direction. And is positioned axially outward of the first and second main rubber elastic bodies 38, 40. In particular, in the positioning protrusions 82 and 84, the outer peripheral surface extending from the proximal end portion positioned on the inner side in the axial direction of each of the first and second tapered outer peripheral surfaces 24 and 30 to the protruding distal end portion radially outward is first and second. Inclined with respect to the respective central axes of the second inner cylindrical fittings 18 and 20, and the inclination angles thereof are made larger than the respective taper angles of the first and second tapered outer peripheral surfaces 24 and 30. Yes. In the present embodiment, the end portions in the axial direction of the first and second main rubber elastic bodies 38, 40 are brought into contact with the positioning projections 82, 84, so that the end portions are excessively outward in the axial direction. Since the protrusion is suppressed, problems such as a change in spring characteristics and a decrease in durability due to the protrusion can be preferably solved.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the specific descriptions in these embodiments, and various changes, modifications, and improvements based on the knowledge of those skilled in the art. Needless to say, any of these embodiments can be included in the scope of the present invention without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the first and second inner cylindrical fittings 18 and 20 are fixed to each other by press-fitting and fixing the press-fit fixing portion 26 of the second inner cylindrical fitting 20 to the first inner cylindrical fitting 18. However, the fixing means may be constituted by bolts, welding, rivets or the like.

  In addition, for example, the first inner cylinder fitting and the second inner cylinder fitting are not press-fitted and fixed, and the two fittings are overlapped in the axial direction and inserted into the inner holes of both fittings without being press-fitted and fixed. The fixing means that can fix the first and second inner cylindrical fittings to each other before mounting on the automobile as in the above-described embodiment is an essential constituent element. Not.

  Moreover, in the said embodiment, although the annular press-fit surface 44 and the linear press-fit surface 46 of the outer cylinder metal fitting 14 extended in the circumferential direction and the axial direction with the substantially same width dimension, these annular press-fit surfaces and a linear press-fit surface of The width dimension may be changed, or the annular press-fitting surface or the linear press-fitting surface may be inclined with respect to the circumferential direction or the axial direction. Furthermore, in the above-described embodiment, the pair of annular press-fitting surfaces 44, 44 and the plurality of linear press-fitting surfaces 46 have the same shape and size, but may be different from each other. Furthermore, the linear press-fit surfaces 46 that are formed at equal intervals in the circumferential direction of the outer cylinder fitting 14 are made unequal, or the lateral rib-like portions 56 that are formed at a substantially central portion in the axial direction of the outer cylinder fitting 14. Can be provided at a position biased to one side in the axial direction, or a plurality of lateral rib portions 56 can be provided at different positions in the axial direction.

  In the above embodiment, the rubber volume of the first main rubber elastic body 38 and the rubber volume of the second main rubber elastic body 40 are substantially the same. For example, one rubber volume is replaced with the other rubber volume. A relatively large load due to the initial load and vibration load by attaching to the automobile so that the main rubber elastic body on the enlarged side becomes the compression action side of the initial load. The durability of the main rubber elastic body on the side that is susceptible to the damage may be improved.

  In addition, for example, in order to effectively secure the contact area of the inner cylindrical metal fitting with the first and second tapered outer peripheral surfaces of the first and second main rubber elastic bodies, a flat surface that spreads in the circumferential direction with a predetermined width is provided. It is formed on the first and second tapered outer peripheral surfaces of the inner cylindrical metal fitting over the entire length in the axial direction, and a part of the inner peripheral surface of the first and second main rubber elastic bodies is brought into contact with this flat surface. good.

  Further, as disclosed in Patent Document 3 (Japanese Patent Application Laid-Open No. 2004-239375), a buffer rubber is provided between the axially facing surfaces of the vehicle body and the bracket metal, or an inner portion protruding downward from the bracket metal By providing a hook-shaped portion in the direction perpendicular to the axis at the tip of the cylindrical metal fitting and providing a buffer rubber between the axially facing surfaces of the hook-shaped portion and the bracket metal fitting, vibration is input in the axial direction, and the inner cylindrical metal fitting When the outer cylinder fitting is relatively displaced, the vehicle body and the bracket fitting are struck through the buffer rubber, or the saddle-shaped part and the bracket fitting are struck through the cushion rubber, The relative displacement between the inner cylinder fitting and the outer cylinder fitting may be limited in a buffering manner.

  In addition, in the above-described embodiments, specific examples of applying the present invention to a suspension member mount for automobiles have been described. However, the present invention can be applied to automobile engine mounts, body mounts, differential mounts, suspension bushings, and other automobiles. Needless to say, the present invention is applicable to various types of cylindrical vibration isolators.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view of the suspension member mount for motor vehicles as 1st embodiment of this invention. The longitudinal cross-sectional view of the 1st inner side cylinder metal fitting which comprises a part of suspension member mount for the vehicles. The bottom view of the 1st inner side cylinder metal fitting. The longitudinal cross-sectional view of the 2nd inner side cylinder metal fitting which comprises a part of suspension member mount for the said motor vehicles. The bottom view of the 2nd inner side cylinder metal fitting. The top view of the outer cylinder metal fitting which comprises a part of suspension member mount for vehicles. VII-VII sectional drawing of FIG. The perspective view of the outer cylinder metal fitting. The longitudinal cross-sectional view which shows the state which assembled | attached the suspension member mount for the said vehicles to the motor vehicle. The perspective view of the outer cylinder metal fitting which comprises a part of suspension member mount for motor vehicles as 2nd embodiment of this invention. The longitudinal cross-sectional view of the suspension member mount for motor vehicles as 3rd embodiment of this invention.

Explanation of symbols

10: suspension member mount for automobile, 12: inner cylinder fitting, 14: outer cylinder fitting, 16: main rubber elastic body, 18: first inner cylinder fitting, 20: second inner cylinder fitting, 24: first taper Outer peripheral surface, 30: second tapered outer peripheral surface, 34: first tapered inner peripheral surface, 36: second tapered inner peripheral surface, 38: first main rubber elastic body, 40: second main rubber elastic body, 42a : First groove portion, 42b: second groove portion, 48: press-fit outer peripheral surface

Claims (5)

  An outer cylindrical member having a press-fit outer peripheral surface press-fitted into a mounting hole having a cylindrical inner peripheral surface and a tapered inner peripheral surface that gradually decreases in diameter from the axially open end portions toward the central portion in the axial direction; A main rubber elastic body is vulcanized and bonded to the tapered inner peripheral surfaces on both axial sides of the outer cylinder member, and the main rubber elastic body has a diameter on the tapered inner peripheral surfaces on both axial sides. On the opposite side in the direction, spring-facing opposing recesses are formed in which the projecting heights from the taper inner peripheral surface to the radially inward direction are respectively reduced. An inner divided member having a tapered outer peripheral surface corresponding to the tapered inner peripheral surface is inserted from both sides in the axial direction, and the inner divided members are fixed to each other so that an inner shaft member is configured. And the The inner peripheral surface of the inner shaft member is made to be elastic against the outer cylindrical member by causing the tapered outer peripheral surface of each inner divided body constituting the inner shaft member to abut against the inner peripheral surface of the main rubber elastic body. A cylindrical vibration isolator for automobiles, which is elastically connected via a body.   The cylindrical vibration isolator for automobiles according to claim 1, wherein a fixing means for fixing the pair of inner divided bodies to each other is provided.   The outer peripheral surface of the outer cylindrical member has a pair of annular press-fitting surfaces extending in the circumferential direction at both end portions in the axial direction, and a linear shape extending in the axial direction across the pair of annular press-fitting surfaces at a plurality of locations on the circumference. A press-fit surface is provided, and in the region surrounded by the pair of annular press-fitting surfaces and the plurality of linear press-fitting surfaces, a hollow recess that opens to the press-fitting outer peripheral surface is formed. Or a tubular vibration isolator for an automobile according to 2;   4. The automotive cylindrical anti-carcass according to claim 3, wherein the outer cylindrical member is provided with a central annular press-fitting surface that extends in the circumferential direction at an axially central portion and connects the plurality of linear press-fitting surfaces to each other. Shaker.   A stepped positioning portion is formed on the outer peripheral surface of the tapered portion of the inner divided body, which is positioned at an axially outer end of the contact region of the main rubber elastic body and has a large inclination angle and extends in the circumferential direction. The tubular vibration isolator for automobiles according to any one of claims 1 to 4.

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