JP2008249032A - Antivibration device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antivibration device capable of preventing a rubber elastic body from parting from attachment members while the rubber elastic body does not adhere to any of the attachment members. <P>SOLUTION: An outside surface of the rubber elastic body 30 is clamped so as to be enclosed by an attaching seat plate 11 and an armature stopper 12 structuring a first attaching member 10. Then, a first engaging part 11b of the attaching seat plate 11 engages with the rubber elastic body 30 in a first direction. A through-hole 32a piercing though the first direction is formed in the rubber elastic body 30. A shaft-like member 22 of a second attaching member 20 is provided with a base shaft part 41 and second engaging parts 42, 43. The shaft-like member 22 is press-fitted through the through-hole 32a and the second engaging parts 42, 43 are engaged with the rubber elastic body 30 in the first direction. The base shaft part 41 contacts an inner circumferential surface of the through-hole 32a over the whole circumference. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vibration isolator used for, for example, an engine mount and a bush.

  As this type of conventional vibration isolator, for example, there are those described in Japanese Patent Application Laid-Open No. 8-296681 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2003-202053 (Patent Document 2). In the vibration isolator described in Patent Documents 1 and 2, a rubber elastic body is vulcanized and bonded to the outer peripheral surface of a shaft-like member attached to one of the vibration source side member and the vibration receiving side member, and the outer peripheral surface of the rubber elastic body is attached. The outer member is sandwiched by a plurality of outer members, and the outer member is attached to the other of the vibration source side member and the vibration receiving side member. Thus, by making the outer peripheral surface of the rubber elastic body non-bonded without vulcanizing and bonding, the durability of the rubber elastic body can be improved and the manufacturing cost can be reduced.

  However, even in the vibration isolators described in Patent Documents 1 and 2, a rubber elastic body is vulcanized and bonded to the outer peripheral surface of the shaft member. Therefore, in order to further improve the durability of the rubber elastic body and further reduce the manufacturing cost, it is desired that the rubber elastic body is not bonded without being vulcanized.

Incidentally, an anti-vibration device in which a rubber elastic body is not bonded without being vulcanized is described in Japanese Patent Application Laid-Open No. 2003-56443 (Patent Document 3). The vibration isolator described in Patent Document 3 is separated into a plurality of parts by cutting a cylindrical rubber elastic body in the axial direction, and the outer periphery of the shaft-like member is sandwiched between the plurality of separated rubber elastic bodies. The outer periphery of the rubber elastic body is held between a plurality of outer members. That is, the rubber elastic body is separated in order to attach the rubber elastic body to the shaft-like member. Further, in order to prevent the rubber elastic body from being detached in the axial direction with respect to the shaft-shaped member, a protrusion is provided at the axial end of the shaft-shaped member.
JP-A-8-296681 JP 2003-202053 A JP 2003-56443 A

  However, in the vibration isolator described in Patent Document 3, the separation of the rubber elastic body for attachment to the shaft member adversely affects the spring characteristics of the rubber elastic body. That is, when the rubber elastic body is separated, appropriate spring characteristics cannot be exhibited. Therefore, it is necessary to integrally mold the rubber elastic body without separating it. Further, in order to prevent the rubber elastic body from being detached in the axial direction with respect to the shaft-shaped member, a protrusion is provided at the axial end of the shaft-shaped member. The engaging force in the direction is reduced. Accordingly, there is a possibility that the rubber elastic body is detached from the shaft-like member in the axial direction. Thus, in order to prevent the rubber elastic body from being detached from the shaft-like member, it is necessary to integrally mold the rubber elastic body without separating it. Furthermore, in the vibration isolator described in Patent Document 3, a gap is formed between the inner peripheral side of the rubber elastic body and the outer peripheral surface of the shaft-shaped member. Also from this, the engaging force in the axial direction decreases, and the rubber elastic body may be detached from the axial member in the axial direction.

  The present invention has been made in view of such circumstances, and provides a vibration isolator capable of preventing the rubber elastic body from being detached from the mounting member by making the rubber elastic body non-adhering to all the mounting members. The purpose is to do.

  The vibration isolator of the present invention is arranged to be separated from the first attachment member, the first attachment member attached to the first member which is one of the vibration source side member and the vibration receiving side member, and the vibration source side member and the vibration It is a vibration isolator provided with the 2nd attachment member attached to the 2nd member which is the other of the receiving side members, and the rubber elastic body which elastically connects the 1st attachment member and the 2nd attachment member. The rubber elastic body is integrally molded and includes a through hole formed so as to penetrate in a first direction parallel to the base end face. The first mounting member includes a mounting seat plate and an armature stopper. The mounting seat plate is in contact with the base end surface in a non-adhesive state and is attached to the first member, and a first plate that is provided in the base plate portion and engages with the rubber elastic body in a non-adhesive state in the first direction. And an engaging portion. The armature stopper has a U-shape with a pair of opposed pieces, and surrounds the distal end portion of the rubber elastic body and both end faces of the rubber elastic body in the second direction parallel to the base end surface and orthogonal to the first direction. Then, both end surfaces of the rubber elastic body in the second direction are sandwiched by the pair of opposing pieces and attached to the first member together with the mounting seat plate. The second mounting member includes a shaft-shaped member. The shaft-shaped member is attached to the second member and inserted into the through-hole by press-fitting, and is in contact with the inner peripheral surface of the through-hole in a compressed state over the entire circumference, and the shaft-shaped member is provided in the base shaft and is inserted into the through-hole. And a second engagement portion that engages in the first direction.

  According to the vibration isolator of the present invention, the rubber elastic body is attached so as to be sandwiched between the attachment seat plate and the armature stopper constituting the first attachment member. Moreover, the rubber elastic body has attached the axial member which comprises a 2nd attachment member to the through-hole by press injection. Accordingly, the rubber elastic body is attached to both the first attachment member and the second attachment member in a non-adhered state without being vulcanized and bonded. Thereby, while being able to improve the durability of a rubber elastic body, manufacturing cost can be reduced more.

  Here, in order to attach the rubber elastic body to the first attachment member and the second attachment member in a non-adhered state, if the rubber elastic body is cut in the axial direction and separated into a plurality of parts, the spring characteristics are adversely affected. Therefore, in the vibration isolator of the present invention, the rubber elastic body is integrally formed. Therefore, adverse effects on the spring characteristics of the rubber elastic body can be avoided.

  If the rubber elastic body is simply attached to the first attachment member and the second attachment member in an unbonded state, the rubber elastic body may be detached from the first attachment member and the second attachment member. Therefore, in the vibration isolator of the present invention, the entire circumference of the rubber elastic body including the base end face, the tip end portion, and both end faces in the second direction is surrounded by the mounting seat plate and the armature stopper. Accordingly, the rubber elastic body is prevented from being detached from the mounting seat plate and the armature stopper in the enclosed direction (direction orthogonal to the first direction). The rubber elastic body engages with the first engagement portion of the mounting seat plate in the first direction. Therefore, the rubber elastic body is prevented from being detached in the first direction with respect to the mounting seat plate. Furthermore, the rubber elastic body engages with the second engagement portion of the shaft-like member press-fitted into the through hole in the first direction in which the through hole is formed. In addition to this, the rubber elastic body is integrally formed. Further, the base shaft portion of the shaft-shaped member comes into contact with the inner peripheral surface of the through hole of the rubber elastic body in a compressed state over the entire circumference. In other words, no gap is formed between the outer peripheral surface of the base shaft portion of the shaft-like member and the inner peripheral surface of the through hole of the rubber elastic body, and the contact state is reliably maintained because it is in a compressed state. . Thus, the rubber elastic body is reliably prevented from separating in the first direction with respect to the shaft-like member.

  Further, in the vibration isolator of the present invention, the second engaging portion is a first annular protrusion formed to protrude in a direction perpendicular to the axis on the proximal end side of the base shaft portion, and a distal end side of the base shaft portion. It is good to provide the 2nd annular projection part which is spaced apart in the direction of an axis to the 1st annular projection part, is projected and formed in the direction perpendicular to the axis, and sandwiches a rubber elastic body between the 1st annular projection part.

  In this way, by holding the rubber elastic body in the first direction by the first annular protrusion and the second annular protrusion, it is possible to reliably prevent the rubber elastic body from being detached from the shaft-like member in the first direction. . Furthermore, in this case, the portions of the rubber elastic body that are in contact with the first annular protrusion and the second annular protrusion can be both end faces of the rubber elastic body in the first direction. Therefore, the shape of the rubber elastic body can be facilitated.

  Here, when the second engagement portion includes the first annular protrusion and the second annular protrusion described above, when the rubber elastic body is press-fitted into the shaft-like member, the inner peripheral shape of the rubber elastic body However, it is necessary to enlarge and deform to the outer peripheral shape of the first annular protrusion or the second annular protrusion. Depending on the amount of expansion deformation, the mounting property for attaching the rubber elastic body to the shaft-like member becomes very poor. Therefore, the following is recommended. That is, the axial perpendicular direction width of the outer peripheral surface of the base shaft portion is formed in a tapered shape that decreases from the proximal end side toward the distal end side, and the axial perpendicular direction width of the inner peripheral surface of the through hole is the proximal end side of the base shaft portion It is good to form in the taper shape which becomes small toward the other end side corresponding to the front end side of a base shaft part from the one end side corresponding to this. The rubber elastic body can be easily attached to the shaft-like member by press-fitting by inserting one end side of the through hole of the rubber elastic body from the distal end side of the base shaft portion of the shaft-like member.

  In particular, in this case, in the cross section cut in the first direction, the width in the direction perpendicular to the axis of the second annular protrusion is preferably equal to or smaller than the width in the direction perpendicular to the axis on one end side of the inner peripheral surface of the through hole. As a result, when the rubber elastic body is press-fitted into the shaft-like member, the one end side of the through-hole of the rubber elastic body can be easily positioned so as to contact the tip end side of the base shaft portion of the shaft-like member, and the press-fitting workability is extremely high It becomes good.

  Here, in the above description, the case where the second engagement portion includes the first annular protrusion and the second annular protrusion has been described. In addition, the second engagement portion may include only the following shaft center engagement portion, or in addition to the first annular projection portion and the second annular projection portion, the following shaft center engagement portion. May be further provided.

  That is, in the vibration isolator of the present invention, the second engagement portion includes an axial center engagement portion that is an axially central portion of the outer peripheral surface of the base shaft portion and is formed to project outward in a direction perpendicular to the axis. A recess that engages with the shaft center engaging portion may be provided. The second engaging portion includes an axial center engaging portion which is an axially central portion of the outer peripheral surface of the base shaft portion and is formed in a concave shape in an axially perpendicular inner direction, and the through hole is engaged with the axial center engaging portion. You may make it provide the protrusion part to match.

  This shaft center engaging portion can prevent the rubber elastic body from being detached in the first direction with respect to the shaft-shaped member. In particular, when the second engagement portion includes the first annular protrusion, the second annular protrusion, and the shaft center engagement portion, the rubber elastic body is separated from the shaft member in the first direction. It can be prevented more reliably.

  Here, the second mounting member described above may include a bracket body that is integrally formed with the shaft-shaped member and is attached to the second member. That is, instead of using a dedicated member as the shaft member, the shaft member can be a part of a bracket or the like. Here, conventionally, a rubber elastic body is vulcanized and bonded to the outer peripheral surface of the shaft-shaped member. Accordingly, if the shaft-like member is a part of a bracket or the like, the member to be vulcanized and bonded increases in size, leading to an increase in the size of the rubber mold, resulting in an increase in manufacturing cost. Therefore, conventionally, the shaft-shaped member is formed separately from a member such as a bracket, and both are fastened by a bolt or the like. On the other hand, according to the vibration isolator of the present invention, the shaft-like member is attached in a non-bonded state without vulcanizing and bonding the rubber elastic body. Therefore, the problem itself of an increase in the size of the rubber mold at the time of vulcanizing and bonding the shaft-shaped member and the rubber elastic body does not occur. Therefore, the number of components can be reduced by integrally forming the bracket body and the shaft-shaped member with the shaft-shaped member as a part of the bracket. As a result, the manufacturing cost can be reduced.

  Next, the present invention will be described in more detail with reference to embodiments. Here, the vibration isolator of the present embodiment will be described by taking as an example an engine mount for an FF vehicle in which main vibrations are input in the vehicle vertical direction. That is, the vibration isolator is an engine mount in which the vibration source side member is an engine and the vibration receiving side member is an engine frame.

<First embodiment>
The vibration isolator 1 of 1st embodiment is demonstrated with reference to FIG. 1 and FIG. FIG. 1 is a front view of the vibration isolator 1 of the first embodiment. 2 is a cross-sectional view taken along the line AA in FIG. Here, in FIG. 1 and FIG. 2, the up-down direction corresponds to the up-down direction of the vehicle. Unless otherwise specified, in the following description, up and down means up and down in FIGS. 1 and 2, that is, up and down of the vehicle. Moreover, let the left-right direction of FIG. 1 be a 2nd direction, and let the left-right direction of FIG. 2 be a 1st direction. That is, the first direction and the second direction are orthogonal to the vertical direction, and the first direction and the second direction are orthogonal.

  As shown in FIGS. 1 and 2, the vibration isolator 1 includes a first attachment member 10, a second attachment member 20, and a rubber elastic body 30. First, a schematic configuration of the vibration isolator 1 will be described. The first attachment member 10 is attached to an engine frame that is a first member (not shown). Moreover, the 2nd attachment member 20 is attached to the engine which is a 2nd member (not shown). The second mounting member 20 is disposed away from the first mounting member 20. The rubber elastic body 30 elastically connects the first mounting member 10 and the second mounting member 20. The rubber elastic body 30 is attached to the first attachment member 10 and the second attachment member 20 in a non-adhered state without being vulcanized and bonded. The rubber elastic body 30 attenuates vibration transmitted from the engine to the first mounting member 10 and suppresses transmission of the vibration to the second mounting member 20.

  Below, the structure of the vibration isolator 1 is demonstrated in detail. The rubber elastic body 30 is integrally formed in a substantially rectangular block shape as a whole. Specifically, the width of the rubber elastic body 30 in the second direction (left-right direction in FIG. 1) is substantially equal to the height of the rubber elastic body 30 in the vertical direction, and the width in the first direction (left-right direction in FIG. 2) is The shape is sufficiently smaller than the height in the direction and the width in the second direction.

  The rubber elastic body 30 includes a base portion 31 formed below the rubber elastic body 30 and a cylindrical portion 32 formed above the base portion 31. A base end surface 31a which is the lower surface of FIG. 1 in the base 31 is formed in a planar shape. A rectangular recess 31b is formed in the center of the base end face 31a. That is, the recess 31b is opened downward in FIG. 1, and the opening shape is rectangular. The first direction width of the recess 31b is about one third of the first direction width of the base end face 31a, and the second direction width of the recess 31b is about one third of the second direction width of the base end face 31a. It is. A straight 31c penetrating in the first direction (left-right direction in FIG. 2) is formed in the base 31 above the upper end of the recess 31b and in the center in the second direction. The tickling 31c is provided for adjusting the spring characteristics, and the shape thereof is appropriately changed.

  The cylindrical part 32 is formed in a cylindrical shape. The second direction width of the cylindrical portion 32 is formed to be smaller than the second direction width of the base portion 31. And the cylindrical part 32 is provided with the through-hole 32a penetrated and formed in the direction penetrated to a 1st direction. The cross-sectional shape of the through hole 32a cut in a direction orthogonal to the first direction is formed in a rectangular shape whose second direction is the longitudinal direction.

  The first mounting member 10 includes a mounting seat plate 11 and an armature stopper 12. The mounting seat plate 11 is formed by bending a steel plate. Specifically, the mounting seat plate 11 includes a base plate portion 11a, a central projection portion 11b, and a pair of side wall portions 11c and 11d. The base plate portion 11a is formed in a rectangular flat plate shape having a longitudinal direction in the second direction. The upper surface of the base plate portion 11a contacts the base end surface 31a in a non-adhered state. Further, bolt insertion holes 11e for attaching to the engine frame are formed at both ends in the second direction of the base plate portion 11a, and attached to the engine frame.

  The central protruding portion 11b (corresponding to the “first engaging portion” of the present invention) is formed to protrude upward at the center in the first direction and the second direction of the base plate portion 11a. The central protrusion 11b has a rectangular shape and is formed in a shape obtained by transferring the shape of the recess 31b of the base 31 of the rubber elastic body 30 or a shape slightly larger than the transferred shape. The central protrusion 11 b is fitted in the recess 31 b of the base 31. That is, the central protrusion 11b is in contact with the recess 31b in a non-adhesive state over the entire surface. Accordingly, the central protrusion 11 b is engaged with the base 31 of the rubber elastic body 30 in the first direction and the second direction.

  The pair of side wall portions 11c and 11d (corresponding to the “first engagement portion” in the present invention) are bent upward from both ends in the first direction of the base plate portion 11a. That is, the pair of side wall portions 11c and 11d are opposed to each other in the first direction. The distance between the pair of side wall portions 11 c and 11 d is the same as the width in the first direction of the rubber elastic body 30 or slightly smaller than the width in the first direction of the rubber elastic body 30. That is, the opposing surfaces of the pair of side wall portions 11 c and 11 d are in contact with the end surface in the first direction of the base portion 31 of the rubber elastic body 30 in a non-adhered state. Accordingly, the pair of side wall portions 11 c and 11 d are engaged with the base portion 31 of the rubber elastic body 30 in the first direction.

  The armature stopper 12 is formed in a substantially U shape as a whole by bending a steel plate. Specifically, the armature stopper 12 includes an upper side 12a, a pair of opposing pieces 12b and 12c extending downward from the second direction end of the upper side 12a, and a lower end of the pair of opposing pieces 12b and 12c. It is comprised from a pair of flange parts 12d and 12e formed so that it might spread in two directions.

  Specifically, the first direction width of the upper side portion 12 a is formed slightly larger than the first direction width of the rubber elastic body 30. The width in the second direction of the upper side portion 12 a is slightly smaller than the second direction width of the base 31 of the rubber elastic body 30 and slightly larger than the second direction width of the cylindrical portion 32 of the rubber elastic body 30. Has been. Further, both end portions of the upper side portion 12a in the first direction are slightly bent upward to increase rigidity.

  The first direction width of the pair of opposed pieces 12b and 12c is formed to be the same as the first direction width of the upper side portion 12a. The height in the vertical direction of the pair of facing pieces 12 b and 12 c is slightly higher than the height in the vertical direction of the rubber elastic body 30. Furthermore, it forms in the step shape so that a separation distance may spread toward the downward direction at the lower end side of a pair of opposing piece 12b, 12c. The separation distance in the second direction of the stepped portions 12 f and 12 g is formed to be the same as the second direction width of the base portion 31 of the rubber elastic body 30 or slightly smaller than the second direction width of the base portion 31. Further, the vertical heights of the stepped portions 12 f and 12 g are formed slightly lower than the vertical height of the base portion 31 of the rubber elastic body 30. Further, both ends in the first direction of the pair of facing pieces 12b and 12c are bent outward to increase the rigidity.

  Here, the upper side portion 12 a is disposed above the cylindrical portion 32 of the rubber elastic body 30 (corresponding to “the front end portion of the rubber elastic body 30”). Further, the pair of facing pieces 12 b and 12 c are disposed so as to face both end surfaces of the rubber elastic body 30 in the second direction. That is, the upper side portion 12a and the pair of opposed pieces 12b and 12c surround the distal end portion of the rubber elastic body 30 and both end surfaces in the second direction. Further, of the pair of opposing pieces 12b and 12c, the stepped portions 12f and 12g are brought into contact with the second direction end surface and the upper surface of the base 31 of the rubber elastic body 30 in a non-adhered state.

  The pair of flange portions 12 d and 12 e are disposed so as to overlap the upper surface of the base plate portion 11 a of the mounting seat plate 11. A bolt insertion hole 12h is formed in the pair of flange portions 12d and 12e so as to coincide with the bolt insertion hole 11e formed in the base plate portion 11a. The armature stopper 12 is attached to the engine frame together with the attachment seat plate 11.

  That is, the base 31 of the rubber elastic body 30 is sandwiched with respect to the second direction by the stepped portions 12f and 12g of the pair of opposing pieces 12b and 12c of the mounting seat plate 11 and the armature stopper 12. That is, the stepped portions 12 f and 12 g of the pair of opposed pieces 12 b and 12 c are engaged with the base portion 31 of the rubber elastic body 30 in the second direction. Furthermore, the base 31 of the rubber elastic body 30 is sandwiched in the vertical direction by the stepped portions 12 f and 12 g and the base plate portion 11 a of the mounting seat plate 11. That is, the stepped portions 12f and 12g of the pair of opposed pieces 12b and 12c and the base plate portion 11a are engaged with the base portion 31 of the rubber elastic body 30 in the vertical direction. Further, the pair of opposing pieces 12 b and 12 c are engaged with the cylindrical portion 32 of the rubber elastic body 30 in the second direction. Further, the upper side portion 12 a is engaged with the cylindrical portion 32 of the rubber elastic body 30 in the vertical direction. Accordingly, the upper side portion 12a and the pair of opposed pieces 12b and 12c exhibit a function as a stopper when the cylindrical portion 32 moves upward and in the second direction.

  The second attachment member 20 is an engine bracket attached to the engine. The second mounting member 20 includes a bracket body 21 and a shaft-like member 22. The bracket body 21 is made of a metal block that is directly attached to the engine. The shaft-shaped member 22 is integrally formed so as to extend in the first direction from the end surface of the bracket body 20 in the first direction. The shaft-shaped member 22 includes a base shaft portion 41, a first annular projection portion 42, and a second annular projection portion 43.

  The base shaft portion 41 is formed in a hollow quadrangular prism shape. Specifically, the cross-sectional shape obtained by cutting the outer peripheral surface of the base shaft portion 41 in the first direction is slightly larger than the shape obtained by transferring the shape of the through hole 32a of the cylindrical portion 32 of the rubber elastic body 30. The axial length of the base shaft portion 41 is slightly longer than the first direction width of the rubber elastic body 30. The base shaft portion 41 is inserted into the through hole 32a of the cylindrical portion 32 by press fitting, and is in contact with the inner peripheral surface of the through hole 32a in a compressed state over the entire circumference.

  The first annular projecting portion 42 (corresponding to the “second engaging portion” of the present invention) is formed in an annular shape, and is integrally provided on the outer peripheral surface of the base end portion 41 (the right side in FIG. 2). The base shaft portion 41 is formed so as to protrude from the outer peripheral surface of the base shaft portion 41 in the direction perpendicular to the axis. The second annular protrusion 43 (corresponding to the “second engaging portion” of the present invention) is formed in an annular shape and is provided integrally on the outer peripheral surface of the distal end side (left side in FIG. 2) of the base shaft portion 41. ing. The base shaft portion 41 is formed so as to protrude from the outer peripheral surface of the base shaft portion 41 in the direction perpendicular to the axis. Further, the second annular protrusion 43 is formed to be separated from the first annular protrusion 42 in the first direction. Specifically, the separation distance in the first direction between the first annular protrusion 42 and the second annular protrusion 43 is the same as the width in the first direction of the rubber elastic body 30. The end faces of the first annular protrusion 42 and the second annular protrusion 43 are in contact with both opening edges of the through hole 32 a of the cylindrical portion 32 of the rubber elastic body 30. That is, the rubber elastic body 30 is sandwiched between the second annular protrusion 43 and the first annular protrusion 42.

  The assembly process of the vibration isolator 1 configured as described above will be described. First, the mounting seat plate 11, the armature stopper 12, the second mounting member 20, and the rubber elastic body 30 are each molded separately (individual molding process).

  Subsequently, the rubber elastic body 30 is placed on the mounting seat plate 11. Specifically, the central protrusion portion 11b of the mounting seat plate 11 is formed on the base portion 31 of the rubber elastic body 30 so that the base portion 31 of the rubber elastic body 30 is sandwiched between the pair of side wall portions 11c and 11d in the first direction. Fit into the recess 31b (mounting seat plate mounting step). At this time, the central protrusion 11b abuts on the entire surface of the recess 31b in a non-adhered state, and the pair of side walls 11c and 11d abuts on the first direction end surface of the base 31 in a non-adhered state. Furthermore, the base end face 31a of the base 31 of the rubber elastic body 30 is in contact with the base plate 11a of the mounting seat plate 11 in a non-adhered state.

  Subsequently, the armature stopper 12 is disposed so as to cover the rubber elastic body 30 from above (armature stopper mounting step). Specifically, the stepped portions 12 f and 12 g of the pair of opposed pieces 12 b and 12 c of the armature stopper 12 are arranged so as to contact the end surface and the upper surface of the base 31 of the rubber elastic body 30 in the second direction. That is, the base 31 of the rubber elastic body 30 is sandwiched between the stepped portions 12f and 12g of the pair of opposed pieces 12b and 12c in the second direction. Further, the base portion 31 of the rubber elastic body 30 is sandwiched between the stepped portions 12f and 12g of the pair of opposed pieces 12b and 12c and the base plate portion 11a in the vertical direction. And a pair of flange parts 12d and 12e are arrange | positioned so that it may overlap with the baseplate part 11a. In this state, the pair of flange portions 12d and 12e and the base plate portion 11a are fastened to the engine frame by fastening bolts.

  Subsequently, the second attachment member 20 is attached to the rubber elastic body 30. Specifically, the shaft-like member 22 is inserted by press-fitting into the through hole 32a of the cylindrical portion 32 of the rubber elastic body 30 (press-fit process). More specifically, the second annular projection 43 side of the shaft-like member 22 is inserted from one opening side of the through hole 32a, and the second annular projection 43 is taken out from the other opening side of the through hole 32a. At this time, since the opening width of the through hole 32a is smaller than the width of the outer peripheral surface of the second annular protrusion 43, the second annular protrusion 43 is inserted while enlarging the through hole 32a. And in the state where the 2nd annular projection 43 was taken out from the other opening side of penetration hole 32a, cylindrical part 32 of rubber elastic body 30 is the 1st annular projection 42 and the 2nd annular projection in the 1st direction. 43. Furthermore, the outer peripheral surface of the base shaft portion 41 of the shaft-shaped member 22 is in contact with the inner peripheral surface of the through hole 32a of the cylindrical portion 32 in a compressed state over the entire circumference. This press-fitting step may be performed before the mounting seat plate placing step.

  As described above, the rubber elastic body 30 is attached to the first attachment member 10 and the second attachment member 20 in a non-adhered state without being vulcanized and bonded. Therefore, the durability of the rubber elastic body 30 can be improved and the manufacturing cost can be reduced.

  Even if the rubber elastic body 30 is not bonded to the first mounting member 10 and the second mounting member 20, the rubber elastic body 30 is detached from the first mounting member 10 and the second mounting member 20 as follows. That is definitely prevented. First, in the direction orthogonal to the first direction, the rubber elastic body 30 is surrounded by the mounting seat plate 11 and the armature stopper 12 constituting the first mounting member 10, so that the rubber elastic body 30 is the first mounting member 10. Will not leave in that direction. In particular, in the second direction, the central protrusion 11b is fitted into the recess 31b of the base 31 of the rubber elastic body 30, and the end surface of the base 31 in the second direction faces the pair of opposing pieces 12b and 12c of the armature stopper 12. In order to be clamped, the base 31 of the rubber elastic body 30 is positioned with respect to the first mounting member 10.

  Further, in the first direction, the central protrusion 11 b is fitted into the recess 31 b of the base 31 of the rubber elastic body 30, and the first direction end surface of the base 31 is a pair of side wall portions 11 c and 11 d of the mounting seat plate 11. Therefore, the base 31 of the rubber elastic body 30 is positioned with respect to the mounting seat plate 11.

  Furthermore, in the first direction, the cylindrical portion 32 of the rubber elastic body 30 is sandwiched between the first annular protrusion 42 and the second annular protrusion 43, so the cylindrical portion 32 of the rubber elastic body 30 is axial. Positioned relative to member 22. Further, the outer peripheral surface of the base shaft portion 41 is in contact with the inner peripheral surface of the through-hole 32a of the cylindrical portion 32 in a compressed state over the entire circumference, and the rubber elastic body 30 is all integrally formed. . Therefore, a gap is not formed between the outer peripheral surface of the base shaft portion 41 of the shaft-shaped member 22 and the inner peripheral surface of the through hole 32a of the cylindrical portion 32 of the rubber elastic body 30, and the contact state between the two is ensured. Maintained. Thereby, the cylindrical portion 32 of the rubber elastic body 30 has a sufficiently high engaging force with respect to the shaft member 22 in the first direction. Therefore, the rubber elastic body 30 is reliably prevented from separating in the first direction with respect to the shaft-like member 22.

  Further, since the rubber elastic body 30 is not vulcanized and bonded to the shaft-shaped member 22, the shaft-shaped member 22 can be integrally formed with the bracket body 21. If the shaft-like member 22 is a part of a bracket or the like, the vulcanization adhesion target member is increased in size, resulting in an increase in the size of the rubber mold, resulting in an increase in manufacturing cost. Therefore, when the rubber elastic body 30 is vulcanized and bonded to the shaft-shaped member 22, the shaft-shaped member 22 needs to be formed separately from a member such as a bracket and fastened with a bolt or the like. . However, the shaft-like member 22 is attached in a non-adhered state without the rubber elastic body 30 being vulcanized and bonded. Accordingly, the problem itself of an increase in the size of the rubber molding die at the time of vulcanizing and bonding the shaft-shaped member 22 and the rubber elastic body 30 does not occur. Therefore, the number of parts can be reduced by integrally forming the bracket body 21 and the shaft-shaped member 22 using the shaft-shaped member 22 as a part of the engine bracket. As a result, the manufacturing cost can be reduced.

<Second embodiment>
Next, the vibration isolator 100 of 2nd embodiment is demonstrated with reference to FIG. FIG. 3 is a view corresponding to the AA cross-sectional view of FIG. 1 in the vibration isolator 100 of the second embodiment. Here, the vibration isolator 100 in the second embodiment is different from the vibration isolator 1 in the first embodiment in the second mounting member 120 and the rubber elastic body 130. Therefore, only the second mounting member 120 and the rubber elastic body 130 will be described, and the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The rubber elastic body 130 includes a base portion 31 and a cylindrical portion 132. The base 31 is the same as the base 31 in the vibration isolator 1 of the first embodiment. The cylindrical portion 132 is different from the cylindrical portion 32 in the vibration isolator 1 of the first embodiment only in the shape of the inner peripheral surface of the through hole 132a. The axial perpendicular direction width of the inner peripheral surface of the through hole 132a of the cylindrical portion 132 is formed in a tapered shape that decreases from the right end to the left end in FIG. That is, the right end opening in FIG. 3 in the through hole 132a is larger than the left end opening in FIG.

  The second mounting member 120 includes the bracket body 21 and the shaft-like member 122. The bracket body 21 is the same as the bracket body 21 in the vibration isolator 1 of the first embodiment. The shaft-shaped member 122 includes a base shaft portion 141, a first annular projection portion 142, and a second annular projection portion 143.

  The base shaft portion 141 is formed in a hollow, substantially quadrangular pyramid shape. Specifically, the axial perpendicular direction width of the outer peripheral surface of the base shaft portion 141 is formed in a tapered shape that decreases from the base end side (right side in FIG. 3) toward the distal end side (left side in FIG. 3). That is, the cross-sectional shape obtained by cutting the outer peripheral surface of the base shaft portion 141 in the first direction is slightly larger than the shape obtained by transferring the shape of the through hole 132a of the cylindrical portion 132 of the rubber elastic body 130. The axial length of the base shaft portion 141 is slightly longer than the first direction width of the rubber elastic body 130. The base shaft portion 141 is inserted into the through-hole 132a of the cylindrical portion 132 by press-fitting, and is in contact with the inner peripheral surface of the through-hole 132a in a compressed state over the entire circumference.

  The first annular protrusion 142 is integrally provided on the outer peripheral surface of the base end portion 141 (the right side in FIG. 3), and protrudes from the outer peripheral surface of the base shaft portion 141 in the direction perpendicular to the axis. Further, the second annular protrusion 143 is integrally provided on the outer peripheral surface on the distal end side (left side in FIG. 3) of the base shaft portion 141, and is formed so as to protrude from the outer peripheral surface of the base shaft portion 141 in the direction perpendicular to the axis. And in the cross section cut | disconnected in the 1st direction, the axial perpendicular direction width | variety of this 2nd annular projection part 143 is formed below the axial orthogonal | vertical direction width | variety of the right end side of FIG. 3 in the internal peripheral surface of the through-hole 132a.

  In this manner, by forming the inner peripheral surface of the through hole 132a and the outer peripheral surface of the base shaft portion 141 in a tapered shape, when the shaft-shaped member 122 is press-fitted into the through hole 132a, the right end side of the through hole 132a in FIG. Positioning can be easily performed so as to contact the outer peripheral edge of the second annular protrusion 143 that is the tip side of the base shaft portion 141 of the shaft-shaped member 122, and the press-fit workability becomes very good.

<Third embodiment>
Next, the vibration isolator 200 of 3rd embodiment is demonstrated with reference to FIG. FIG. 4 is a view corresponding to the AA cross-sectional view of FIG. 1 in the vibration isolator 200 of the third embodiment. Here, the vibration isolator 200 in the third embodiment is different from the vibration isolator 100 in the second embodiment in the second mounting member 220 and the rubber elastic body 230. Therefore, only the second mounting member 220 and the rubber elastic body 230 will be described, and the same components as those of the first embodiment or the second embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  The rubber elastic body 230 includes a base portion 31 and a cylindrical portion 232. The base 31 is the same as the base 31 in the vibration isolator 1 of the first embodiment. The cylindrical part 232 is different from the cylindrical part 132 in the vibration isolator 100 according to the second embodiment in that the cylindrical part 232 includes a recess 232b. The concave portion 232b is formed in a concave groove shape at the center in the first direction of the through hole 132a in the outer circumferential direction at the right angle to the entire circumference.

  The second mounting member 220 includes the bracket body 21 and the shaft-like member 222. The shaft-shaped member 222 includes a base shaft portion 141, a first annular projection portion 142, a second annular projection portion 143, and a shaft center engaging portion 244. The shaft center engaging portion 244 (corresponding to the “second engaging portion” of the present invention) is located at the center in the first direction of the base shaft portion 141 in the outer direction perpendicular to the axis over the entire circumference. Protrusions are formed. The shaft center engaging portion 244 engages with the recess 232b in the first direction.

  Thus, the engagement force in the first direction between the cylindrical portion 232 of the rubber elastic body 230 and the shaft-shaped member 222 is very high due to the shaft center engaging portion 244 and the recess 232b. Therefore, it can prevent more reliably that the cylindrical part 232 detach | leaves from the shaft-shaped member 222. FIG.

<Other embodiments>
In the third embodiment, the shaft center engaging portion 244 is formed to project outward in the direction perpendicular to the shaft, and the recessed portion 232b is formed in the through hole 132a of the cylindrical portion 232. . That is, the shaft center engaging portion 244 is formed in a concave groove shape in the axially perpendicular inner direction, and forms a protruding portion that protrudes in the axially perpendicular direction at the axial center of the through hole 232a of the tubular portion 232. In this case, the same effect as that of the third embodiment can be obtained.

It is a front view of the vibration isolator 1 of 1st embodiment. It is AA sectional drawing of FIG. In the vibration isolator 100 of 2nd embodiment, it is a figure corresponded in AA sectional drawing of FIG. In the vibration isolator 200 of 3rd embodiment, it is a figure corresponded to AA sectional drawing of FIG.

Explanation of symbols

1, 100, 200: vibration isolator,
10: first mounting member,
11: Mounting plate, 11a: Base plate part, 11b: Center projection part,
11c, 11d: a pair of side wall portions, 11e: bolt insertion hole,
12: Armature stopper, 12a: Upper side, 12b, 12c: A pair of opposing pieces,
12d, 12e: a pair of flange portions, 12f, 12g: stepped portions,
12h: Bolt insertion hole,
20, 120, 220: second mounting member,
21: Bracket main body 22, 122, 222: Shaft-shaped member,
30, 130, 230: rubber elastic body,
31: Base, 31a: Base end surface, 31b: Recess, 31c: Straight
32, 132, 232: cylindrical portion, 32a, 132a: through-hole, 232b: recess 41, 141: base shaft portion, 42, 142: first annular protrusion,
43, 143: second annular protrusion, 244: shaft center engaging portion

Claims (7)

A first attachment member attached to a first member which is one of the vibration source side member and the vibration receiving side member;
A second mounting member that is disposed apart from the first mounting member and is mounted on a second member that is the other of the vibration source side member and the vibration receiving side member;
A rubber elastic body for elastically connecting the first mounting member and the second mounting member;
An anti-vibration device comprising:
The rubber elastic body is integrally molded and includes a through hole formed in a first direction parallel to the base end surface.
The first mounting member is
A base plate portion that contacts the base end surface in a non-adhering state and is attached to the first member; An attachment seat plate comprising an engagement portion;
It has a U-shape with a pair of opposing pieces, and surrounds the distal end portion of the rubber elastic body and both end faces of the rubber elastic body in the second direction parallel to the base end surface and orthogonal to the first direction. An armature stopper that sandwiches both end surfaces of the rubber elastic body in the second direction by the pair of opposed pieces and is attached to the first member together with the mounting seat plate;
With
The second mounting member is
A base shaft portion that is attached to the second member and is inserted into the through hole by press-fitting and is in contact with the inner peripheral surface of the through hole in a compressed state over the entire circumference; And a second engagement portion that engages in the first direction. The second engaging portion is
A first annular protrusion formed on the base end side of the base shaft portion and projecting in a direction perpendicular to the axis;
The front end of the base shaft is axially spaced from the first annular protrusion and protrudes in a direction perpendicular to the axis. The rubber elastic body is sandwiched between the first annular protrusion and the first annular protrusion. A second annular protrusion,
The vibration isolator of Claim 1 provided with. The axial perpendicular direction width of the outer peripheral surface of the base shaft portion is formed in a tapered shape that decreases from the base end side toward the tip end side,
The axially perpendicular width of the inner peripheral surface of the through hole is formed in a tapered shape that decreases from one end side corresponding to the base end side of the base shaft portion toward the other end side corresponding to the tip end side of the base shaft portion. The anti-vibration device according to claim 2.   4. The anti-vibration device according to claim 3, wherein in the cross section cut in the first direction, an axial perpendicular direction width of the second annular protrusion is equal to or less than an axial perpendicular direction width on the one end side of the inner peripheral surface of the through hole. apparatus. The second engaging portion includes an axial center engaging portion that is an axially central portion of the outer peripheral surface of the base shaft portion and is formed to protrude in an axially perpendicular direction,
The anti-vibration device according to any one of claims 1 to 4, wherein the through hole includes a concave portion that engages with the shaft center engaging portion. The second engaging portion includes an axial center engaging portion which is an axially central portion of the outer peripheral surface of the base shaft portion and is formed in a concave shape in an axially perpendicular inner direction,
The said through-hole is a vibration isolator as described in any one of Claims 1-4 provided with the projection part engaged with the said shaft center engaging part.   The vibration isolator according to any one of claims 1 to 6, wherein the second attachment member includes a bracket body that is integrally formed with the shaft-like member and attached to the second member.

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