JP2011231813A - Vibration-proof bushing and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration-proof bushing having a novel structure and a method for manufacturing the bush, in which shapes of an attaching part and a body rubber elastic body disposed at both ends in the axial direction of an inner shaft member can be freely set, without increasing the diameter of the body of the inner shaft member to be fixed to the rubber elastic body.SOLUTION: In the vibration-proof bushing 10, an inner shaft member 12 and an outer cylindrical member 14 disposed as separated in the outer circumference of the inner axial member, are connected by a main rubber elastic body 16, and the vibration-proof bushing 10 has one each of attaching parts 34 on both ends in the axial direction of the inner shaft member 12, respectively. The method for manufacturing the vibration-proof bushing 10 includes: separating each attaching part 34 of the inner shaft member 12 from a body part 18 constituting the center of the inner shaft member 12 in the axial direction; employing a part having a maximum width larger than the outer diameter of the body part 18 as the attaching part 34; and fixing attaching parts 34 to the both ends in the axial direction of the body part 18 respectively, after the body rubber elastic body 16 is vulcanized and adhered to the outer circumferential face of the body part 18.

Description

  The present invention relates to an anti-vibration bush that is suitably used for a suspension bush for an automobile, and a method for manufacturing the same.

  2. Description of the Related Art Conventionally, as an anti-vibration device used in an automobile suspension mechanism or the like, outer cylinder members are arranged separately on the outer peripheral side of an inner shaft member, and a main rubber elastic body is vulcanized and bonded to the inner shaft member and the outer cylinder member. Thus, an anti-vibration bush is known in which an inner shaft member and an outer cylinder member are elastically connected. For example, it is shown in Unexamined-Japanese-Patent No. 2007-15564 (patent document 1) etc.

  In such an anti-vibration bush, plate-like attachment portions are provided at both ends of the inner shaft member, and the attachment portions are attached to a vehicle body or the like by fastening with bolts or the like. Then, the outer cylinder member is attached by press-fitting the suspension arm into the arm eye of the suspension arm, whereby the vibration isolating bushing is attached to the attachment part of the suspension arm to the vehicle body.

  By the way, the attachment part in the inner shaft member is formed with various shapes and sizes according to the structure of the vehicle body to which the inner shaft member is attached, the required attachment strength, and the like. In particular, in order to sufficiently secure the mounting strength of the inner shaft member to the vehicle body and the strength of the mounting portion itself, it is desirable to set the size and thickness of the mounting portion large.

  However, the conventional structure shown in Patent Document 1 has a problem that the shape and size of the mounting portion are limited due to the structure and manufacturing reasons of the inner shaft member and the main rubber elastic body. That is, in the inner shaft member of the conventional structure, both ends of a solid circular rod-shaped metal member are formed by pressing or cutting to form a plate-shaped mounting portion. However, in the case of pressing or cutting, Therefore, it is difficult to form a large mounting portion as compared with the central portion.

  Moreover, in the main rubber elastic body that is integrally vulcanized and molded on the outer peripheral surface of the inner shaft member, an axial parting structure is adopted for the purpose of forming a curl on both end faces in the axial direction. If there are large mounting portions at both ends of the inner shaft member, there is also a problem that hinders mold matching and mold splitting. In particular, in an axial parting structure, an inner shaft to which the main rubber elastic body is vulcanized and bonded is set in order to set a biting portion on the outer peripheral surface of the inner shaft member at both axial end portions of the main rubber elastic body. It was difficult to set the width dimension of the mounting part larger than the outer diameter dimension of the central part of the member.

  If the diameter of the central part of the inner shaft member is increased, the width of the mounting part of the inner shaft member can be substantially increased. However, the diameter of the central part of the inner shaft member made of metal is increased. If so, an increase in weight becomes a problem. In addition, when the outer diameter of the outer cylinder member is limited by the mounting member of the vibration isolating bush, the main rubber elastic body becomes thinner by increasing the diameter of the central portion of the inner shaft member, and the vibration isolating bush The reduction in the degree of freedom in tuning the vibration-proof performance and vibration-proof characteristics is inevitable.

JP 2007-15564 A

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is that the main rubber elasticity of the inner shaft member is increased without increasing the diameter of the fixing portion of the inner shaft member to the main rubber elastic body. An object of the present invention is to provide an anti-vibration bushing having a novel structure in which the shape and size of a mounting portion protruding axially outward from the body can be freely set.

  Another object of the present invention is to provide a novel method for manufacturing a vibration isolating bush for producing the vibration isolating bush that exhibits the special effects described above.

  That is, in the first aspect of the present invention, the inner shaft member and the outer cylinder member spaced apart on the outer peripheral side thereof are connected by the main rubber elastic body, and mounting portions are provided on both axial sides of the inner shaft member. In addition, the mounting portion of the inner shaft member is separated from the body portion at the center in the axial direction of the inner shaft member, and the outer diameter of the body portion is used as the mounting portion. The main body rubber elastic body is vulcanized and bonded to the outer peripheral surface of the main body portion, and then the attachment portions are fixed to both sides in the axial direction of the main body portion. And

  According to the manufacturing method of the vibration isolating bush according to the first aspect, since the attachment portion is fixed to the main body portion after vulcanization adhesion to the main body portion of the main rubber elastic body, the shape and size of the attachment portion, and the main rubber elasticity The shape and configuration of the body molding die can be set independently of each other. Therefore, it is possible to form a main rubber elastic body provided with a tick or a recess that opens in the axial end face by adopting a molding die having a simple configuration that is matched in the axial direction.

  In addition, the shape and size of the mounting part can be freely set, and the mounting part has a maximum width dimension that is larger than the outer diameter of the main body part, so that a large mounting seat surface for a vehicle body or the like is secured. Is done. In addition, the member strength of the attachment portion can be improved by increasing the thickness of the attachment portion.

  In addition, the main body portion disposed on the inner peripheral side of the main rubber elastic body is separated from the attachment portion, thereby making the attachment portion wide and preventing the main body portion from becoming large in diameter. I can do it. As a result, it is possible to ensure a large separation distance between the inner shaft member and the outer cylinder member without requiring an increase in the diameter of the vibration-proof bushing, and to efficiently secure the rubber volume of the main rubber elastic body. Is possible.

  Furthermore, by making the mounting portion independent from the main body portion, it is possible to make the manufacturing method of the main body portion different from the manufacturing method of the mounting portion. Specifically, for example, while forming the main body portion by drawing or the like, the mounting portion is formed by casting, cutting, pressing, or the like, thereby improving the manufacturing efficiency of the main body portion and the shape and size of the mounting portion. The design flexibility can be further improved.

  According to a second aspect of the present invention, in the method for manufacturing an anti-vibration bush according to the first aspect, the main body portion is formed in a cylindrical shape, and the attachment portions are press-fitted from openings at both axial ends of the main body portion. Thus, the respective attachment portions are fixed to the main body portion.

  According to the 2nd aspect, an attaching part can be easily fixed by press-fitting with respect to a main-body part, and the assembly | attachment operation | work of these main-body parts and an attaching part becomes easy. And since the complicated structure for fixing a main-body part and an attachment part is also unnecessary, manufacture of a main-body part and an attachment part becomes easy.

  According to a third aspect of the present invention, in the vibration-proof bushing manufacturing method according to the second aspect, the press-fitting side end surface to the main body portion opens to the press-fitting portion of the mounting portion to the main body portion. It is a formation of a meat recess.

  According to the third aspect, the strength (rigidity) of the press-fitting portion in the mounting portion is reduced by forming the thinning recess so as to open in the press-fitting side end surface, and at the time of press-fitting the mounting portion into the main body portion By deforming the press-fitting portion in the mounting portion, it is possible to prevent the main body portion from being deformed. Therefore, unnecessary initial stress due to deformation of the main body can be prevented from acting on the main rubber elastic body, and the desired vibration-proof characteristic can be realized.

  According to a fourth aspect of the present invention, in the vibration-proof bushing manufacturing method according to any one of the first to third aspects, a portion of the mounting portion that protrudes outward in the axial direction from the main body portion is a plate. The projecting portion is formed in such a manner that the maximum width dimension of the projecting portion is larger than the outer diameter dimension of the main body portion, and a mounting hole is formed through the projecting portion in the thickness direction.

  According to the fourth aspect, the protruding portion that protrudes outward in the axial direction from the main body portion in the mounting portion is plate-shaped, and the maximum width dimension of the protruding portion is larger than the outer diameter size of the main body portion. As a result, the mounting seating surface of the mounting portion can be efficiently set large, and the mounting strength can be improved. In addition, since the mounting holes through which the bolts for mounting and the like are inserted pass through the protruding portion in the thickness direction, a larger mounting hole can be formed, which is required. The degree of freedom in setting the shape and size of the mounting hole according to the mounting strength can be improved.

  According to a fifth aspect of the present invention, the inner shaft member and the outer cylindrical member spaced apart on the outer peripheral side thereof are connected by a main rubber elastic body, and mounting portions are provided on both axial sides of the inner shaft member. Each of the mounting portions having a maximum width dimension larger than an outer diameter dimension of the main body portion on both sides in the axial direction of the main body portion to which the main rubber elastic body is vulcanized and bonded. The inner shaft member is formed by being fixed.

  According to the vibration isolating bush having the structure according to the fifth aspect, the attachment portion is fixed to the main body portion to which the main rubber elastic body is vulcanized and bonded, thereby the shape of the main rubber elastic body and the attachment portion. The shape and size are set independently of each other. As a result, it is possible to appropriately set the shape of the main rubber elastic body and the tickling formed thereon, improving the degree of freedom in tuning the vibration-proof characteristics, and appropriately setting the shape and size of the mounting portion. Thus, it is possible to sufficiently secure the strength of the mounting portion itself and the mounting strength to the vehicle body.

  Moreover, the main body part to which the main rubber elastic body is vulcanized and the attachment part attached to the vehicle body or the like are separated and assembled later, so that the main body part can be attached without increasing the size. The maximum width dimension of the part can be increased. Therefore, while setting the mounting seat surface large and improving the mounting strength, it is possible to secure a large rubber volume (free length in the radial direction) of the main rubber elastic body without requiring an increase in the size of the vibration isolating bush. In addition, the degree of freedom in tuning the vibration isolation characteristics can be improved more advantageously.

  According to a sixth aspect of the present invention, in the vibration-proof bushing according to the fifth aspect, the main body portion has a cylindrical shape, and the attachment portions are respectively provided with respect to openings at both axial ends of the main body portion. It is press-fitted and fixed.

  According to the sixth aspect, since the main body part and the mounting part which are separated from each other are fixed by press-fitting easily and with a sufficient fixing force, the main body part and the mounting part are separated by the action of external force. Can be prevented and can function stably as an inner shaft member.

  According to a seventh aspect of the present invention, in the vibration-proof bushing according to the sixth aspect, the press-fitting portion of the attachment portion into the main body portion is a hollow recess that opens at a press-fitting side end surface of the main body portion. Is formed.

  According to the 7th aspect, the weight reduction of an attaching part is implement | achieved by forming the hollow part in the press-fit part to the main-body part in an attaching part. Thereby, the weight reduction of the whole anti-vibration bush is implement | achieved, without having a bad influence on an anti-vibration characteristic. In addition, since the hollow portion is opened in the end surface on the press-fitting side to the main body part in the mounting part, the press-fitting side end part to the main body part in the mounting part is easily deformed. It can prevent plastic deformation.

  According to the present invention, the attachment portion in the inner shaft member is formed separately from the main body portion, and thus the attachment portion is axially attached to the outer peripheral surface of the main body portion after the main rubber elastic body is vulcanized and bonded. It becomes possible to adhere to both sides, and it is possible to set the shape and size of the mounting portion while avoiding limitations due to reasons such as molding of the main rubber elastic body. Therefore, it is possible to improve the design flexibility of the mounting portion and the vibration-proof bushing without adversely affecting the rubber volume and vibration-proof performance of the main rubber elastic body.

It is a longitudinal cross-sectional view which shows the suspension bush as one Embodiment of this invention, Comprising: II sectional drawing of FIG. II-II sectional drawing of FIG. The front view of the suspension bush shown by FIG. The longitudinal cross-sectional explanatory drawing for demonstrating the vulcanization molding process of the main body rubber elastic body which is one manufacturing process of the suspension bush shown by FIG. The longitudinal cross-sectional explanatory drawing for demonstrating the press-fit process of the attaching part which is one manufacturing process of the suspension bush shown by FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 3 show a suspension bush 10 for an automobile as an embodiment of a vibration-proof bush having a structure according to the present invention. The suspension bush 10 has a structure in which an inner shaft member 12 and an outer cylinder member 14 are connected by a main rubber elastic body 16. In the following description, the axial direction means, in principle, the left-right direction in FIG. 1 that is the axial direction of the outer cylindrical member 14.

  More specifically, the inner shaft member 12 includes a main body portion 18. The main body 18 has a thin cylindrical shape with a small diameter, and is a highly rigid member formed of a metal material such as iron or aluminum alloy. Further, a stopper member 20 is extrapolated to the main body portion 18. The stopper member 20 has a substantially cylindrical shape, and has a large axial dimension in a part of the circumference. In such a part, the axial middle part is a thin portion 22 and the axial direction Both end portions are thick portions 24 that are thicker than the thin portion 22. In addition, the main body portion 18 keeps the inner diameter dimension of the main rubber elastic body 16 described later small and sufficiently secures the rubber volume in the radial direction of the main rubber elastic body 16 with respect to the outer cylinder member 14 described later. It is desirable that the diameter is sufficiently small.

  On the other hand, the outer cylinder member 14 has a thin, large-diameter, generally cylindrical shape, and is a highly rigid member formed of the same material as the inner shaft member 12. The outer cylinder member 14 is spaced from the main body portion 18 of the inner shaft member 12 so as to surround the outer peripheral side, and the main body portion 18 and the outer cylinder member 14 are elastically formed by the main rubber elastic body 16. It is connected.

  The main rubber elastic body 16 is a rubber elastic body having a thick, large-diameter, generally cylindrical shape, and its inner peripheral surface is superimposed on the outer peripheral surface of the main body 18 and vulcanized and bonded, and the outer peripheral surface is The outer cylinder member 14 is overlapped with the inner peripheral surface and vulcanized and bonded. The main rubber elastic body 16 is formed as an integrally vulcanized molded product 26 including the main body portion 18 and the outer cylindrical member 14 in the inner shaft member 12.

  The main rubber elastic body 16 is formed with a pair of recesses 28 and 28. As shown in FIG. 2, the recess 28 is open at the axial end face of the main rubber elastic body 16 and is formed at a portion facing in one direction perpendicular to the axis across the main body 18. .

  Further, the body rubber elastic body 16 is formed with straight edges 30a and 30b. The curls 30a and 30b each have a hole shape penetrating the main rubber elastic body 16 in the axial direction, and are opposed to each other in a direction perpendicular to the axis substantially perpendicular to the facing direction of the pair of recesses 28 and 28. ing. In the present embodiment, on the inner peripheral surfaces of the curls 30a and 30b, the outer portions in the opposing direction of the curls 30a and 30b (the inner surfaces on the outer peripheral sides of the curls 30a and 30b) are rough surfaces with small irregularities. It has a shape (for example, an axial section has a wavefront shape). Further, a portion of the main rubber elastic body 16 located on the outer peripheral side of the tickling 30a is gradually thicker toward the center in the axial direction, and the central portion protrudes more greatly in the tickling 30a.

  Further, the thin wall portion 22 and the thick wall portion 24 of the stopper member 20 are positioned in the circumferential direction with respect to the edge 30a. A stopper rubber 32 which is a part of the main rubber elastic body 16 is vulcanized and bonded to the outer peripheral surface of the thin portion 22 of the stopper member 20, and the thick portion 24 of the stopper member 20 is exposed to the straight 30a. A part of the inner peripheral surface of the straight 30 a is constituted by the stopper member 20. The stopper rubber 32 gradually protrudes in the radial direction as it goes to the center in the axial direction, and protrudes more outward than the thick portion 24 of the stopper member 20.

  A pair of attachment portions 34a and 34b are fixed to the main body portion 18 constituting the integrally vulcanized molded product 26 having such a structure. The attachment portion 34 is separate from the main body portion 18 and includes a press-fit portion 36 and a protruding portion 38 that are integrally formed.

  The press-fit portion 36 has a substantially circular block shape and is a highly rigid member formed of a metal material. Further, the press-fit portion 36 is formed with a substantially columnar hollow 40 and opens at one end face in the axial direction of the press-fit portion 36. By forming the hollow recess 40, the press-fit portion 36 has a substantially bottomed cylindrical shape, and the strength of the peripheral wall portion is reduced. The outer diameter dimension of the press-fit portion 36 is set to be approximately the same as the inner diameter dimension of the main body portion 18, and is a size that can be press-fitted into the center hole of the main body portion 18.

  Further, a protruding portion 38 is formed on the other side in the axial direction of the press-fit portion 36 (the bottom wall portion side of the press-fit portion 36). The protruding portion 38 has a substantially plate shape and is integrally formed with the press-fit portion 36. Further, the protruding portion 38 has a maximum width dimension larger than the outer diameter dimension of the main body 18, and the width dimension of the base end portion is smaller than the outer diameter dimension of the press-fit portion 36. The base end portion of 38 is constricted.

  Further, the projecting portion 38 is formed with a mounting hole 42 penetrating in the thickness direction. In addition, an elliptical mounting hole 42a is formed in the protruding portion 38 of one mounting portion 34a, and a circular mounting hole 42b is formed in the protruding portion 38 of the other mounting portion 34b. However, in order to correspond to the fastening structure on the vehicle body side or to prevent the attachment of the attachment portion 34 to the vehicle body due to dimensional errors or the like, the one attachment hole 42a is elliptical. Thus, the shape of the attachment hole is not particularly limited, and for example, the attachment holes having the same shape may be formed in both the pair of projecting portions 38 and 38.

  Then, the attachment portion 34 having such a structure is fixed to the main body portion 18 constituting the integral vulcanization molded product 26 of the main rubber elastic body 16. That is, the press fitting portions 36 and 36 of the pair of attachment portions 34 a and 34 b are press-fitted from one side in the axial direction to the main body portion 18 to which the main rubber elastic body 16 is vulcanized and bonded. As a result, the pair of attachment portions 34a and 34b are fixed to both sides in the axial direction of the main body portion 18 in a state where the protruding portions 38 protrude from the main body portion 18 in the axial direction. It is comprised by the main-body part 18 and the pair of attachment parts 34a and 34b which were fitted outside. The pair of attachment portions 34a and 34b are positioned in the circumferential direction so that the thickness directions of the protruding portions 38 and 38 coincide with each other and are attached to the main body portion 18, but depending on the structure on the vehicle body side, In some cases, they are mounted in different directions in the circumferential direction.

  Further, the protruding portion 38 has a maximum width dimension that is larger than the maximum outer diameter size of the main body 18, and as shown in FIG. 1, the protruding portion 38 is in the width direction (vertical direction in FIG. 1). Projecting by a predetermined dimension d on the outer side of the main body 18 on both sides.

  The inner shaft member 12 is attached to a vehicle body (not shown) by a bolt inserted into the attachment hole 42 of the protruding portion 38 in the attachment portion 34. Further, the outer cylinder member 14 is press-fitted into an arm eye and is attached to a suspension arm (not shown). As a result, the suspension bush 10 is mounted on the vehicle, and the suspension arms are connected to the vehicle body in a vibration-proof manner.

  The suspension bush 10 having such a structure is manufactured by, for example, a manufacturing method as described below.

  First, the main body 18, the stopper member 20 that is extrapolated to the main body 18, and the outer cylinder member 14 are prepared. Then, the stopper member 20 is extrapolated with respect to the main body portion 18. In addition, since the main-body part 18 and the outer cylinder member 14 are substantially cylindrical metal members, they can be obtained by cutting a metal pipe with a predetermined length. The stopper member 20 may be formed separately from the main body 18, or may be formed on the outer peripheral surface of the main body 18 and fixed to the main body 18.

  Next, as shown in FIG. 4, with respect to the molding dies 44 and 46 of the main rubber elastic body 16, the main body 18 to which the stopper member 20 is attached and the outer cylinder member 14 are set. To do. Then, the cavity 48 of the molding dies 44 and 46 is filled with a rubber material, and the main body rubber elastic body 16 having a desired shape is vulcanized and molded between the main body portion 18 and the outer cylinder member 14, thereby the main body. An integrally vulcanized molded product 26 of the rubber elastic body 16 is formed. The main rubber elastic body 16 is pre-compressed by subjecting the outer cylindrical member 14 of the integrally vulcanized molded product 26 taken out from the molding dies 44 and 46 to diameter reduction processing such as eight-way drawing. The molding die 44 and the molding die 46 are matched in the axial direction to form the straight lines 30a, 30b and the recess 28.

  Next, a pair of mounting portions 34a and 34b prepared in advance separately from the integrally vulcanized molded product 26 are provided on both sides in the axial direction with respect to the integrally vulcanized molded product 26 taken out from the molding dies 44 and 46. It is attached. More specifically, a pair of mounting portions 34a and 34b are press-fitted into the main body portion 18 from the openings on both sides in the axial direction, with the opening-side end portion of the hollow recess 40 in the press-fitting portion 36 being the head on the press-fitting side. Thus, the inner shaft member 12 is configured by the main body portion 18 and the pair of attachment portions 34a and 34b. Thereby, the suspension bush 10 having a structure in which the inner shaft member 12 and the outer cylinder member 14 are connected by the main rubber elastic body 16 is formed. In addition, since the strength of the press-fit portion 36 is reduced by the formation of the hollow recess 40, the press-fit portion 36 is relatively easily deformed. The deformation of the main body 18 is suppressed by the deformation.

  In the suspension bush 10 thus manufactured, after the main rubber elastic body 16 is vulcanized between the main body 18 and the outer cylindrical member 14, the pair of attachment portions 34a and 34b are fixed to the main body 18. Thus, the inner shaft member 12 is configured. Thereby, the structure of the molding die for the main rubber elastic body 16 is not affected by the structure of the pair of attachment portions 34a and 34b, and the molding die 44 having a simple configuration combined in the axial direction is provided. By 46, the main rubber elastic body 16 having the curls 30 and the recesses 28 can be formed.

  In addition, the shape and size of the pair of attachment portions 34a and 34b are not particularly limited, and in particular, the shape and size of the protruding portion 38 that is an attachment portion to the vehicle body can be freely set. Therefore, it is possible to appropriately set the width dimension, the wall thickness, and the like of the protruding portion 38 according to the mounting structure on the vehicle body side, the required mounting strength and member strength, and the like. In the present embodiment, the maximum width dimension of the protruding portion 38 is larger than the outer diameter dimension of the main body 18, and the area of the mounting surface of the protruding portion 38 with respect to the vehicle body is set sufficiently large. The mounting strength with respect to the vehicle body is ensured greatly.

  Furthermore, since the outer diameter of the main body 18 can be kept small while the protruding portion 38 is widened, the inner shaft member 12 and the outer cylindrical member 14 can be reduced without increasing the diameter of the outer cylindrical member 14. A sufficient separation distance in the radial direction can be secured. As a result, it is possible to increase the rubber volume of the main rubber elastic body 16 while preventing the entire suspension bush 10 from being enlarged in the radial direction, thereby improving the vibration isolation performance and improving the degree of freedom in tuning the vibration isolation characteristics. Improvements can be made.

  Further, the pair of attachment portions 34a and 34b are easily fixed by being press-fitted from both sides in the axial direction to the main body portion 18 having a substantially cylindrical shape. As a result, the assembly work of the pair of attachment portions 34a and 34b with respect to the main body portion 18 is simplified, and a complicated fixing structure is not required, and the structure can be simplified.

  Further, the press-fitting portion 36 of the attachment portion 34 is formed with a hollow recess 40 that opens to the end surface on the press-fitting side, and the strength of the press-fitting portion 36 is reduced. By deforming, deformation of the main body 18 is reduced or avoided. In this way, by positively causing deformation of the press-fit portion 36 having a small influence on vibration-proof performance and durability, unnecessary deformation of the main rubber elastic body 16 due to deformation of the main body 18 is prevented, and The anti-vibration characteristic is realized. In addition, since the press-fit portion 36 can be reduced in weight by the meat recess 40, the unsprung weight in the automobile can be reduced.

  Further, a stopper member 20 is extrapolated to the main body portion 18 of the inner shaft member 12, and the surface shape of the portion fixed to the main rubber elastic body 16 in the inner shaft member 12 is set by the stopper member 20. ing. As described above, the surface shape of the inner shaft member 12 that affects the vibration-proof characteristic is set by the synthetic resin stopper member 20 that can be easily formed into an arbitrary shape, thereby having a surface shape according to the required characteristics. The inner shaft member 12 can be easily obtained. In addition, the main body 18 formed of a metal material can be formed into a simple substantially cylindrical shape, and can be efficiently manufactured by drawing or the like.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, as long as the main body portion and the attachment portion have a structure that can be fixed to each other, the structure is not limited to the structure of the embodiment. Specifically, for example, the main body has a solid circular rod shape, and screw holes are formed on both end surfaces in the axial direction of the main body, while a male screw is provided at the end of the protruding portion of the mounting portion. The protrusion may be formed, and the attachment portion may be fixed to both axial sides of the main body portion by screwing the male screw of the attachment portion into the screw hole of the main body portion. On the other hand, it is also possible to project male threads from both axial end surfaces of the main body portion and to form screw holes on the end surfaces of the mounting portion so that the mounting portion is screwed to the main body portion. In addition, a connecting projection that protrudes outward in the axial direction is integrally formed at both axial ends of the main body, and a fitting hole is formed on an end surface of the fitting, and the fitting of the main body is formed with respect to the fitting hole of the fitting. It is also possible to press-fit the connection protrusion and fix the attachment portion to the main body. Furthermore, the attachment portion may be fixedly attached to both end portions in the axial direction of the main body portion by welding or the like. If a solid body is used, the rigidity of the main body can be improved, and if a fixing structure such as screwing or welding is used, it can be attached to the body or mounting part during press fitting during manufacturing. It is possible to avoid the action of external force.

  Further, the main rubber elastic body does not necessarily have to be directly vulcanized and bonded to the outer cylinder member. Specifically, for example, the outer peripheral surface of the main rubber elastic body is vulcanized and bonded to a cylindrical intermediate sleeve, and the intermediate sleeve is inserted into and fixed to the outer cylindrical member, so that the inner shaft member and the outer The cylindrical member may be connected by a main rubber elastic body.

  The present invention can also be applied to a fluid-filled vibration-proof bushing. For example, in the structure including the intermediate sleeve as described above, a plurality of pocket portions opened to the outer peripheral side through the window portion between the main body portion constituting the inner shaft member and the intermediate sleeve including the plurality of window portions. The main rubber elastic body provided with is vulcanized and molded. Next, the outer cylinder member is extrapolated to the intermediate sleeve, and the window portion of the intermediate sleeve is covered with the outer cylinder member, thereby forming a plurality of fluid chambers using the pocket portion and A communicating orifice passage is formed. At that time, the outer cylinder member is assembled in the incompressible fluid with respect to the intermediate sleeve, thereby enclosing the incompressible fluid in the fluid chamber and the orifice passage. Then, the fluid-filled vibration-proof bushing to which the present invention is applied can be realized by fixing the mounting portions on both sides in the axial direction of the main body portion to constitute the inner shaft member.

  Moreover, in the said embodiment, although the attachment part 34a and the attachment part 34b were made into the substantially identical shape except the shape of the attachment hole 42a and the attachment hole 42b, the shape of these pair of attachment parts is mutually different. May be. Further, as is clear from the above description, in the present invention, the outer diameter dimension of the main body portion and the maximum width dimension of the mounting portion are compared in the same corresponding direction perpendicular to the axis. Thereby, the attachment part which has the largest width dimension beyond the outer diameter dimension of the main-body part can be employ | adopted, avoiding the trouble to the mold opening and closing of the shaping | molding die of a main body rubber elastic body. It is also possible to adopt an irregularly shaped main body having different outer diameters in the circumferential direction. In this case, the outer diameter of the main body is compared with the maximum width of the mounting portion in the same direction perpendicular to the axis. , Set according to the present invention.

  Further, the shape, size, number, and the like of the slip formed through the main rubber elastic body are not particularly limited, and are appropriately set according to the required vibration isolation characteristics. Furthermore, the tickling is not essential and may not be formed.

10: Suspension bush (vibration-proof bush), 12: Inner shaft member, 14: Outer cylinder member, 16: Rubber elastic body of main body, 18: Main body portion, 34: Mounting portion, 36: Press-fit portion, 38: Projection portion, 40 : Meat extraction recess, 42: Mounting hole

Claims (7)

The inner shaft member and the outer cylinder member spaced apart on the outer peripheral side thereof are connected by a main rubber elastic body, and a method of manufacturing a vibration-proof bushing in which attachment portions are provided on both sides in the axial direction of the inner shaft member,
The mounting portion of the inner shaft member is separated from the main body portion in the axial direction of the inner shaft member, and the mounting portion has a maximum width dimension larger than the outer diameter of the main body portion. And
After vulcanizing and bonding the main rubber elastic body to the outer peripheral surface of the main body,
A method for manufacturing a vibration isolating bush, wherein the attachment portions are fixed to both sides of the main body in the axial direction.   2. The vibration isolating bushing according to claim 1, wherein the main body portion is formed into a cylindrical shape, and the attachment portions are fixed to the main body portion by press-fitting the attachment portions from openings at both axial ends of the main body portion. Production method.   The manufacturing method of the vibration-proof bushing of Claim 2 which formed the hollowing recessed part opened in the press-fitting side end surface to this main-body part with respect to the press-fit part to the said main-body part in the said attaching part.   A portion of the mounting portion that protrudes outward in the axial direction from the main body portion is a plate-like protruding portion, the maximum width dimension of the protruding portion is larger than the outer diameter size of the main body portion, and the protruding portion The method for manufacturing a vibration isolating bush according to any one of claims 1 to 3, wherein a mounting hole is formed by penetrating in the thickness direction. The inner shaft member and the outer cylinder member spaced apart on the outer peripheral side thereof are connected by a main rubber elastic body, and the vibration isolating bush is provided with attachment portions on both sides in the axial direction of the inner shaft member,
The inner shaft is fixed by attaching the mounting portions having a maximum width dimension larger than the outer diameter dimension of the main body portion to both sides in the axial direction of the main body portion to which the main rubber elastic body is vulcanized and bonded. An anti-vibration bush characterized in that a member is formed.   The anti-vibration bush according to claim 5, wherein the main body portion has a cylindrical shape, and the attachment portions are press-fitted and fixed to openings at both axial ends of the main body portion.   The anti-vibration bushing according to claim 6, wherein a wall insertion recess is formed at a press-fitting portion of the attachment portion into the main body portion and opens at an end surface on the press-fitting side into the main body portion.

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