JP2020060222A - Cylindrical vibration controller - Google Patents

Abstract

To provide a cylindrical vibration controller having a novel structure, capable of effectively preventing a holder from coming off without significantly impairing workability of mounting to the holder.SOLUTION: A cylindrical vibration controller 10 comprises: an inner shaft member 16; an outer cylinder member 18 made of synthetic resin; a body rubber elastic body 20 connecting the inner shaft member 16 and the outer cylinder member 18; a locking piece 26 provided with a locking claw 28 that is formed to extend axially outward from the outer cylinder member 18 and is locked to the opening edge of a mounting hole 48 into which the outer cylinder member 18 is press-fitted; a restricting member 16 positioned so as to be separated from the inner peripheral side of the locking piece 26; and an elastic auxiliary part 60 arranged between the restriction member 16 and the locking piece 26.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cylindrical vibration isolator having an outer cylindrical member made of synthetic resin.

  BACKGROUND ART Conventionally, as a type of vibration isolator, a tubular vibration isolator in which an inner shaft member and an outer tubular member are connected by a main rubber elastic body is known. Such a cylindrical vibration isolator is used, for example, in member mounts, engine mounts, body mounts, differential mounts, etc. of automobiles.

  In addition, such a cylindrical vibration isolator generally has a cylindrical shape in which the inner shaft member is fixed to one member to be vibration-coupled with a bolt or the like, and the other member to be vibration-coupled is provided. The outer tubular member is mounted by being press-fitted into the holder portion.

  By the way, in recent years, for reasons such as weight reduction and manufacturing cost reduction, as described in Japanese Utility Model Laid-Open No. 5-77637 (Patent Document 1), instead of a conventional metal outer cylinder member, a synthetic resin is used. The adoption of an outer tubular member made of aluminum is being considered.

  However, the outer cylinder member made of synthetic resin is difficult to stably obtain the press-fitting fixing force to the holder over a long period of time due to heat and fatigue due to changes over time, and it is difficult to secure the axial pull-out resistance. It was

  In addition, as shown in the above-mentioned Patent Document 1, in order to secure a pulling resistance force in the axial direction in the outer cylinder member made of synthetic resin, a locking protrusion provided on the outer peripheral surface of the outer cylinder member, A structure in which the end surface of the mounting hole is locked is also proposed. However, if an attempt is made to increase the protrusion height of the locking projection to increase the pulling resistance, the locking projection may be an obstacle when the outer tubular member is inserted into the mounting hole and mounted, It was difficult to obtain sufficient pull-out resistance at the locking projection.

Japanese Utility Model Publication No. 5-77637

  A problem to be solved by the present invention is to provide a tubular vibration-damping device having a novel structure, which can effectively prevent removal from the holder without significantly impairing workability of mounting on the holder. It is in.

  Hereinafter, embodiments of the present invention made to solve such problems will be described. The constituent elements used in each of the following aspects can be used in any combination as much as possible.

  A first aspect of the present invention includes an inner shaft member, an outer tubular member made of synthetic resin, a main body rubber elastic body connecting the inner shaft member and the outer tubular member, and an axial outer member from the outer tubular member. A locking piece that extends outwardly and is provided with a locking claw that locks to the opening edge of the mounting hole into which the outer tubular member is press-fitted; The tubular vibration-damping device is characterized in that it has a restricting member that is positioned so as to be positioned, and an elastic auxiliary portion that is arranged between the restricting member and the locking piece.

  According to the tubular vibration-damping device having the structure according to the present aspect, when the outer tubular member is mounted on the holder, the locking piece comes into contact with the regulation member via the elastic auxiliary portion, so that the inner circumference of the locking piece is prevented. Since the displacement to the side is restricted, the elastic auxiliary portion can supplementarily improve the locking force of the locking claw to the opening edge of the mounting hole.

  A second aspect of the present invention is the tubular vibration damping device according to the first aspect, wherein the regulating member is constituted by the inner shaft member.

  According to the tubular vibration-damping device having the structure according to this aspect, it is not necessary to separately provide a restriction member, and the restriction member is advantageously configured by using the inner shaft member that is generally a strength member having relatively large rigidity. obtain.

  A third aspect of the present invention is the tubular vibration damping device according to the first aspect, wherein the restriction member is integrally formed with the outer tubular member.

  According to the tubular vibration damping device having the structure according to the present aspect, it is not necessary to separately provide a restriction member, and the restriction member is advantageously configured by using the outer cylinder member that is generally a strength member having relatively large rigidity. obtain.

  A fourth aspect of the present invention is, in the tubular vibration damping device according to any one of the first to third aspects, buffers relative displacement in the axial direction between the inner shaft member and the outer tubular member. It has a stopper rubber that constitutes a stopper mechanism for limiting, and the elastic auxiliary portion is integrally formed so as to extend axially inward from the stopper rubber.

  According to the tubular vibration-damping device having the structure according to this aspect, the elastic auxiliary portion can be provided by making good use of the stopper rubber that constitutes the stopper mechanism, and the number of parts can be reduced.

  A fifth aspect of the present invention is the tubular vibration damping device according to any one of the first to fourth aspects, wherein the locking piece is partially formed in a circumferential direction of the outer tubular member. It is a thing.

  According to the tubular vibration damping device having the structure according to this aspect, for example, the locking piece is divided in the circumferential direction to facilitate bending of the locking piece, and thus inserting the locking piece into the mounting hole. It is possible to tune workability.

  A sixth aspect of the present invention is the tubular vibration damping device according to any one of the first to fifth aspects, wherein the elastic auxiliary portion has a tapered shape toward the base end side of the locking piece. It has been done.

  According to the tubular vibration damping device having the structure according to the present aspect, the operation of inserting the elastic auxiliary portion between the regulating member and the locking piece and assembling it can be facilitated.

  A seventh aspect of the present invention is the tubular vibration-damping device according to any one of the first to sixth aspects, in which the elastic auxiliary portion hits the tip of the locking piece and extends inward in the axial direction. A thick portion that defines the insertion end is provided.

  According to the cylindrical vibration damping device having the structure according to the present aspect, the thick portion is brought into contact with the tip of the locking piece, so that the elastic auxiliary portion has a size intended to be inserted inward in the axial direction. It becomes possible to set it stably.

  An eighth aspect of the present invention is, in the tubular vibration damping device according to any one of the first to seventh aspects, a stepped portion that extends from one axial end of the outer tubular member toward the inner peripheral side. And the locking piece is provided so as to project axially outward from the stepped portion.

  According to the tubular vibration damping device having the structure according to this aspect, the rigidity of the outer tubular member itself can be improved by the reinforcing action of the stepped portion, and the tubular member attached to the holder in the outer tubular member can be provided. The heat and deformation transmitted from the portion to the locking piece are reduced by the stepped portion interposed therebetween, so that the locking state of the locking claw in the mounting hole can be further stabilized.

  Further, by adopting the outer tubular member according to this aspect, the outer tubular member can be used not only for the cylindrical pipe-shaped holder but also for a cup-shaped holder having a hole at the center of the bottom with a substantially bottomed tubular shape. The member can be press-fitted and fixed, and the locking claw can be mounted by hooking it on the opening edge of the hole in the center of the bottom of the cup-shaped holder.

  According to the cylindrical vibration damping device having the structure according to the present invention, while the good insertability into the holder is ensured, the elastic auxiliary portion further stabilizes the locking state of the locking claw with respect to the opening edge of the mounting hole. Can be maintained and effectively prevented from accidentally coming out of the holder.

FIG. 3 is a vertical cross-sectional view showing the tubular vibration-damping device as the first embodiment of the present invention, which is a cross-sectional view taken along line I-I in FIG. II-II sectional drawing in FIG. FIG. 2 is an exploded perspective view of the tubular vibration damping device shown in FIG. 1. FIG. 2 is a plan view showing a stopper member that constitutes the tubular vibration damping device shown in FIG. 1. FIG. 5 is a bottom view of the stopper member shown in FIG. 4. FIG. 3 is a perspective view showing the tubular vibration-damping device shown in FIG. 1 in a state of being attached to a holder. The longitudinal cross-sectional view which shows the cylindrical vibration isolator as 2nd embodiment of this invention. The longitudinal cross-sectional view which shows the cylindrical vibration isolator as 3rd embodiment of this invention.

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

  First, FIGS. 1 to 3 show a member mount 10 for an automobile as a first embodiment of a tubular vibration damping device according to the present invention. The member mount 10 has a structure in which a separate stopper member 14 is assembled to the mount body 12. In the following description, the up-down direction or the axial direction refers to the up-down direction in FIG. 1, which is generally the up-down direction when the vehicle is mounted.

  More specifically, the mount body 12 has an inner shaft member 16 and an outer cylinder member 18 that are arranged inside and outside with a predetermined distance therebetween. Further, a main body rubber elastic body 20 is provided between the inner shaft member 16 and the outer tubular member 18 facing each other in the direction perpendicular to the axis, which are arranged on substantially the same central axis, and the inner shaft member 16 and the outer tubular member 18 are provided. Are elastically connected by a main rubber elastic body 20.

  The inner shaft member 16 is made of a material having high rigidity such as metal or synthetic resin, and has a hollow cylindrical shape extending substantially straight in the vertical direction.

  The outer tubular member 18 is formed of a synthetic resin material that is fiber-reinforced as necessary, and has a main body portion 22 that has a large-diameter, substantially cylindrical shape and extends substantially vertically in the vertical direction.

  An annular plate-shaped stopper flange 18A that spreads to the outer periphery is integrally formed at the lower end of the main body portion 22 in the axial direction.

  On the other hand, a stepped portion 24 that widens toward the inner peripheral side is provided at the axially upper end of the main body portion 22 of the outer tubular member 18. In the present embodiment, the stepped portion 24 is partially formed in the circumferential direction, and the pair of stepped portions 24, 24 are formed to face each other in the axis-perpendicular direction. Specifically, the portion where the stepped portion 24 is formed and the portion where the stepped portion 24 is not formed are alternately formed at substantially equal intervals (every approximately 90 degrees) in the circumferential direction with a circumferential dimension of approximately 90 degrees. Further, the stepped portion 24 projects to the inner peripheral side in a size that does not reach the inner shaft member 16 located on the inner peripheral side, and there is a gap between the stepped portion 24 and the inner shaft member 16 in the radial direction. Is set.

  Furthermore, the stepped portion 24 is provided with a locking piece 26 that projects outward (upward) in the axial direction. In the present embodiment, the locking piece 26 is an inner peripheral edge portion of the stepped portion 24. In, it is integrally formed over substantially the entire length in the circumferential direction. As a result, in the present embodiment, the locking pieces 26 are provided separately on the outer peripheral side of the inner shaft member 16 and are partially formed in the circumferential direction of the outer tubular member 18, and the pair of engaging members are provided. Stop pieces 26, 26 are formed to face each other in a direction perpendicular to the axis. The locking piece 26 extends substantially straight upward and has a substantially constant thickness dimension or becomes slightly thin toward the protruding tip, and an external force is applied to the locking piece 26 on the inner peripheral side. It is elastically deformable so as to bend. In particular, in this embodiment, since the locking pieces 26 are partially formed in the circumferential direction, the bending deformation toward the inner circumferential side is relatively easy.

  Further, a locking claw 28 that projects to the outer peripheral side is provided at the protruding tip of the locking piece 26. In the present embodiment, the locking claw 28 is formed over substantially the entire length in the circumferential direction of the locking piece 26, and the lower end surface of the locking claw 28 is a flat surface 30 extending in the direction perpendicular to the axis. The outer peripheral surface is an inclined surface 32 that is inclined upward in a direction in which the thickness dimension of the locking claw 28 gradually decreases. The locking piece 26 of the present embodiment is formed with an upward protruding dimension such that the upper end including the locking claw 28 does not reach the upper end surface of the inner shaft member 16.

  The main rubber elastic body 20 is a thick rubber elastic body having a substantially cylindrical shape, the inner peripheral surface of which is superposed and fixed on the outer peripheral surface of the inner shaft member 16, and the outer peripheral surface of the outer cylindrical member 18. The inner peripheral surface of the is superposed and fixed. Further, the main rubber elastic body 20 is integrally formed with a lower stopper rubber 36 protruding downward on the stopper flange 18A of the outer tubular member 18. The main rubber elastic body 20 is formed as an integrally vulcanization molded product including the inner shaft member 16 and the outer tubular member 18. In the present embodiment, the axial dimension of the inner shaft member 16 is larger than the axial dimension of the outer tubular member 18, and the inner shaft member 16 moves outward from both axial sides of the outer tubular member 18. It is protruding.

  Further, in the present embodiment, on the end surfaces on both sides in the axial direction of the main rubber elastic body 20, there are formed the upper groove 38 and the lower groove 40 in the shape of a groove that are open outward in the axial direction and extend in the circumferential direction. It is formed around the shaft member 16.

  Furthermore, in the circumferential portion of the outer tubular member 18 where the stepped portion 24 is formed, a slit hole 42 extending axially through so as to connect both bottom surfaces of the upper cursed portion 38 and the lower cursed portion 40. Are formed. The slit hole 42 is formed along the outer peripheral surface of the inner shaft member 16, and, as shown in FIG. 2, both end portions in the circumferential direction of the slit hole 42 correspond to the stepped portion 24 of the outer tubular member 18. It extends radially outward along both circumferential edges and reaches near the inner peripheral surface of the cylindrical main body portion 22 of the outer tubular member 18.

  As a result, elastic deformation and stress transmission are reduced between the rubber elastic body portions 20a, 20a on both the left and right sides sandwiching the inner shaft member 16 and the rubber elastic body portions 20b, 20b on the upper and lower sides. 2, the main rubber elastic body 20 is mainly compressed and deformed when the vibration is input in the horizontal direction, while the main rubber elastic body 20 is mainly sheared and deformed when the vibration is input in the vertical direction in FIG. ing. As a result, the spring ratio in the two directions orthogonal to the axis orthogonal to each other is set to be large, and in the main rubber elastic body 20, the stress in the vicinity of the boundary between the formation portion and the non-formation portion of the pair of stepped portions 24, 24. Concentration is being eased.

  In the present embodiment, the main rubber elastic body 20 is also fixed to the lower surface (inner surface in the axial direction) of the stepped portion 24, and at the position where the stepped portion 24 is formed, the main rubber elastic body 20 is attached to the stepped portion 24. Since the inner peripheral edge is reached and the slit hole 42 is formed, the upper cursed portion 38 is substantially absent in the circumferential region where the stepped portion 24 is formed. Further, the slit hole 42 is opened outward (upward) in the axial direction through the gap between the stepped portion 24 and the inner shaft member 16. Further, the radial dimension of the slit hole 42 gradually increases downward.

  When mounted on a vehicle, the mount body 12 having the above-described structure is mounted on the vehicle body side member X on which the inner shaft member 16 is superposed on the axially upper end surface, as shown by a phantom line in FIG. On the other hand, it is fixedly attached by a fixing bolt to be inserted. In addition, a washer-shaped stopper metal fitting that extends to the outer periphery is also superposed on the axial lower end surface of the inner shaft member 16 and is fixedly attached by a fixing bolt inserted into the inner shaft member 16. On the other hand, the outer tubular member 18 is press-fitted and fixed to a holder Y integrally provided on a sub-frame such as a suspension member.

  In the present embodiment, an inverted cup-shaped holder Y is provided in which an annular plate-shaped upper bottom wall portion 46 is provided in the upper opening of the substantially cylindrical peripheral wall portion 44, and the center of the upper bottom wall portion 46 is used. An insertion hole 48 as a mounting hole is formed in the inner wall of the peripheral wall 44, and a flange 50 is formed in the lower end opening of the peripheral wall 44. The main body portion 22 of the outer tubular member 18 is press-fitted and fixed to the peripheral wall portion 44 of the holder Y.

  Further, the locking piece 26 of the outer tubular member 18 is inserted into the insertion hole 48 of the upper bottom wall portion 46 of the holder Y, and the locking claw 28 is engaged with the outer surface (upper surface) of the opening edge of the insertion hole 48. By being stopped, a mechanism for preventing the outer tubular member 18 from being pulled downward from the holder Y is configured. During insertion into the insertion hole 48, the inclined surface 32 of the locking claw 28 contacts the inner peripheral edge of the insertion hole 48, the locking piece 26 is pushed toward the inner peripheral side and bends, and the locking claw 28 is inserted into the insertion hole. Upon passing over 48, the locking piece 26 elastically restores and deforms, and the locking claw 28 is locked to the upper bottom wall portion 46 of the holder Y.

  On the other hand, the stopper member 14 that constitutes the member mount 10 together with the mount main body 12 as described above has an annular shape as a whole as shown in the single-part drawings in FIGS. The inner shaft member 16 forming the member is assembled near the upper end in the axial direction in an externally inserted state to form an upper stopper mechanism.

  The stopper member 14 has a ring-shaped holding member 52 formed of hard synthetic resin or the like, and a stopper rubber 54 is fixed to the holding member 52. In the present embodiment, a pair of plate-shaped support portions 56, 56 is formed by expanding the holding member 52 toward the inner peripheral side in the portions facing each other in one radial direction. A stopper rubber 54 is fixed to each plate-shaped support portion 56, and the stopper rubber 54 is provided so as to cover the surface of the plate-shaped support portion 56 and project upward. Further, on the inner peripheral surfaces of the plate-shaped support portions 56, 56, an inward projection 58 that is elastically fitted by being brought into contact with the inner shaft member 16 is integrally formed with the stopper rubber 54. .

  In the present embodiment, the pair of stopper rubbers 54, 54 are formed with circumferential positions and dimensions that are accommodated in the non-formed portions of the pair of stepped portions 24, 24 in the outer tubular member 18 of the mount body 12. .

  Further, in the circumferential direction of the holding member 52, an elastic auxiliary portion 60 is provided at a portion where the plate-shaped support portion 56 is not formed so as to be separated from the holding member 52 to the inner circumferential side and extend in the circumferential direction. In short, the pair of elastic auxiliary portions 60, 60 are provided at the positions facing each other in the radial direction orthogonal to the pair of stopper rubbers 54, 54. The pair of elastic auxiliary portions 60, 60 are integrally formed with the pair of stopper rubbers 54, 54 in a state of extending across the circumferential ends of the pair of stopper rubbers 54, 54.

  In addition, in the present embodiment, the pair of elastic auxiliary portions 60, 60 are formed with circumferential positions and dimensions corresponding to the formation portions of the pair of step-shaped portions 24, 24 in the outer tubular member 18 of the mount body 12. There is.

  The elastic auxiliary portion 60 has a relatively thin, generally curved plate shape that curves along the outer peripheral surface of the inner shaft member 16 and extends axially inward (downward) from the stopper rubber 54. The thickness of the elastic auxiliary portion 60 in the radial direction is set so that it can be inserted into the gap between the inner shaft member 16 and the locking piece 26 of the outer tubular member 18. In the present embodiment, the elastic auxiliary portion 60 has a substantially constant thickness dimension in the vertical direction or a tapered cross-sectional shape that gradually decreases downward (toward the base end side of the locking piece 26). Furthermore, at the upper end portion of the elastic auxiliary portion 60, a thick portion 62 whose thickness dimension is increased toward the outer peripheral side is provided over the entire length in the circumferential direction. The outer diameter of the thick portion 62 is larger than the inner diameter of the protruding tip of the locking piece 26 by δ (see FIG. 1). Further, a step surface is formed by the lower end of the thick portion 62 in the axially intermediate portion of the elastic auxiliary portion 60, and the step surface is a tapered surface 64 whose outer diameter gradually decreases downward. ing.

  The stopper member 14 having the above-described structure is externally inserted into the inner shaft member 16, and the holding member 52 and the stopper rubbers 54, 54 are placed on the upper bottom wall portion 46 of the holder Y. , Is mounted to the mount body 12 (see also the reference mounting state diagram in FIG. 6). Then, the relative displacement amount of the inner shaft member 16 and the outer tubular member 18 in the axial bounding direction due to the elastic deformation of the main rubber elastic body 20 due to the axial load (the relative displacement amount of the sub-frame upward with respect to the vehicle body). The stopper mechanism for limiting the shock absorber is configured to include the stopper member 14. The stopper member 14 may be assembled to the mount body 12 after, for example, the mount body 12 is press-fitted into the holder Y and before being attached to the vehicle body side member X.

  In addition, when the stopper member 14 is mounted on the vehicle, the pair of elastic auxiliary portions 60, 60 are arranged so as to be inserted between the pair of locking pieces 26, 26 and the inner shaft member 16 from above. There is. The upper end portion of the locking piece 26 protruding upward from the insertion hole 48 of the holder Y is located on the inner peripheral side of the holding member 52 and is also applied to the vehicle body side member X by vibration input. It is located axially downward so as not to contact.

  Further, the thick portion 62 of the stopper member 14 is arranged above the locking piece 26, and the upper end of the locking piece 26 has the thick portion 62 as shown in the partially enlarged view of FIG. It is in contact with the tapered surface 64 at the lower end. This defines the insertion end of the elastic auxiliary portion 60 inward (downward) in the axial direction of the locking piece 26. Particularly, in the present embodiment, the upper end of the thick portion 62 abuts on the vehicle body side member X, so that when the holder Y is displaced upward with respect to the vehicle body side member X due to the input of the vibration load, it is locked. A pressing force to the outer peripheral side by the thick portion 62 is exerted on the upper end of the piece 26, so that the bending deformation of the locking piece 26 to the inner peripheral side is suppressed. As a result, the locking state of the locking claw 28 with the holder Y is stabilized, and the outer cylinder member 18 is more effectively prevented from slipping out downward from the holder Y. In addition, a slight radial gap 66 is set between the inner peripheral surface of the locking piece 26 and the outer peripheral surface of the elastic auxiliary portion 60 in consideration of dimensional errors of the members.

  In the member mount 10 of the present embodiment configured as described above, the elastic auxiliary portion 60 is inserted between the locking piece 26 locked to the holder Y and the inner shaft member 16 in the vehicle mounted state. For example, even when a force is exerted on the inner side of the locking piece 26, the locking piece 26 contacts the inner shaft member 16 via the elastic auxiliary portion 60, so that The displacement to the peripheral side is limited, and the repulsive force of the elastic auxiliary portion 60 exerts an urging force to the outer peripheral side of the locking piece 26. As a result, the elastic assisting portion 60 assists the locking force of the locking piece 26 to the opening edge of the insertion hole 48, and the locking state is stably maintained. The detachment of the mount body 12 from Y can be prevented.

  In particular, in the present embodiment, the tapered surface 64 of the thick portion 62 exerts a pressing action on the outer peripheral side of the locking piece 26, and the thick portion 62 is contacted with the vehicle body side member X. Since it is bulged and deformed to the outer periphery to more effectively exert the pressing action on the outer peripheral side of the locking piece 26, the locking state of the locking piece 26 to the holder Y by the locking claw 28 is more stable. Can be maintained.

  Further, in the present embodiment, since the step portion 24 is provided between the main body portion 22 and the locking piece 26 in the outer tubular member 18, it extends to the main body portion 22 press-fitted and fixed to the holder Y. The transmission of external force or heat to the locking piece 26 is reduced. Therefore, the settling due to the external force or heat of the locking piece 26 is reduced, and the effect of preventing the outer tubular member 18 from coming off the holder Y by the locking action of the locking claw 28 to the holder Y is more stably exhibited. Can be done.

  Next, FIG. 7 shows a member mount 78 for an automobile as a second embodiment of the tubular vibration damping device according to the present invention. Also in this embodiment, the holder Y is a cup-shaped holder, and the outer tubular member 82 of the mount main body 80 is provided with the stepped portion 84 and the locking piece 86, similarly to the above-described embodiment. A locking claw 88 provided on the stop piece 86 is locked to the opening edge of the insertion hole 48 of the holder Y. In the following description, members and parts that are substantially the same as those in the above-described embodiment will be denoted by the same reference numerals as those in the above-described embodiment in the drawings, and detailed description thereof will be omitted.

  In the outer tubular member 82 in the present embodiment, the stepped portion 84 is formed in a circular plate shape that is continuous over the entire circumference in the circumferential direction. The locking piece 86 is formed in a substantially cylindrical shape that is continuous over the entire circumference in the circumferential direction, and projects upward from the inner peripheral edge of the stepped portion 84. Further, a locking claw 88 is integrally formed at the protruding tip of the locking piece 86, which has a continuous annular shape over the entire circumference in the circumferential direction and projects on the outer peripheral surface in a substantially hook-shaped cross-sectional shape. . The main rubber elastic body 90 is fixed to the lower surface of the stepped portion 84 over substantially the entire surface. As a result, the inner peripheral edge portion of the upper end portion of the main rubber elastic body 90 has an annular shape having an opening portion having a radial dimension substantially equal to the radial dimension in the gap between the stepped portion 84 and the inner shaft member 16. An upper cursed portion 92 is formed. In short, the mount main body 80 of the present embodiment has not only the inner shaft member 16 but also the outer tubular member 82 and the main rubber elastic body 90 as a whole, and has a rotationally symmetrical shape about the central axis.

  Further, the present embodiment does not include the upper stopper mechanism, but employs the elastic auxiliary portion 94 as an integrally molded product of a rubber elastic body. The elastic auxiliary portion 94 integrally includes a thick portion 96 and a tapered surface 98 at an upper end thereof, and has a substantially cylindrical shape which has a constant cross-sectional shape and is continuous over the entire circumference in the circumferential direction around the central axis. ing.

  Also in the member mount 78 of the present embodiment, the elastic assisting portion 94 can supplementally improve the locking force of the locking claw 88 to the opening edge of the insertion hole 48, similar to the first embodiment. The effect of can be exhibited.

  Next, FIG. 8 shows a member mount 100 for an automobile as a third embodiment of the tubular vibration damping device according to the present invention. In the present embodiment, the holder Y'has a slate pipe shape extending in a constant circular cross section over the entire length in the axial direction. Correspondingly, the outer tubular member 102 is not provided with the stepped portions (24, 84) in the first and second embodiments, and the outer peripheral surface of the outer tubular member 102 is press-fitted and fixed. Corresponding to the shape of the inner peripheral surface of the inner hole 104 as a mounting hole in the holder Y ′, the holder Y ′ has a cylindrical shape that extends straight over substantially the entire length in the vertical direction.

  In addition, a locking piece 106 having a thin cylindrical shape and extending upward in the axial direction is integrally formed at an upper end portion of the outer tubular member 102. Like the locking pieces (26, 86) of the first and second embodiments, the locking piece 106 is integrally provided with a locking claw 108 projecting on the outer peripheral surface at the upper end portion. Further, at the upper end portion of the outer tubular member 102, a regulation wall portion 110 that extends in an approximately cylindrical shape upward in the axial direction in a state of being restrained toward the inner peripheral side is integrally formed as a regulation member. In addition, in the present embodiment, the restriction wall portion 110 is thicker than the locking piece 106, and further thicker than the tubular main body portion 22 of the outer tubular member 102.

  The restriction wall portion 110 is arranged substantially parallel to the inner peripheral side of the locking piece 106 with a predetermined distance therebetween, and has the same protruding height in the axial direction as the locking piece 106. Then, the elastic auxiliary portion 114 is inserted from above into the circumferential groove-shaped recess 112 formed between the locking piece 106 and the restriction wall portion 110 in the radial direction.

  Similar to the second embodiment, the elastic auxiliary portion 114 of the present embodiment is an integrally molded product of a rubber elastic body having a substantially thin cylindrical shape that is rotationally symmetrical about the central axis, and has a recess. It has inner and outer diameter dimensions that are substantially the same as the inner and outer diameter dimensions of 112. A thick portion 116 and a tapered surface 118 are integrally formed at the upper end of the elastic auxiliary portion 114. The elastic auxiliary portion 114 is inserted and assembled to a depth that does not reach the bottom of the recess 112 slightly.

  In the member mount 100 of the present embodiment, the locking claw 108 of the locking piece 106 is retained and locked to the opening edge of the upper end of the inner hole 104 of the holder Y ′. Further, the elastic auxiliary portion 114 elastically suppresses the deformation of the locking piece 106 toward the inner peripheral side, whereby the locking force of the locking claw 88 to the opening edge of the insertion hole 48 is supplementarily improved. Thus, the same effect as that of the first and second embodiments can be exhibited.

  Although the embodiments of the present invention have been described above, the present invention is not limitedly interpreted by the specific description of the embodiments, and various changes, modifications, improvements, etc. are based on the knowledge of those skilled in the art. Can be implemented in a mode in which is added.

  For example, in the above-described embodiment, the restricting member located on the inner peripheral side of the locking pieces 26, 86, 106 is separated from the inner shaft member 16 or the outer tubular member 102, but the inner shaft member or the outer member is not provided. It is also possible to constitute by another member independent of the tubular member. For example, in the member mount 10 of the first embodiment, the cylindrical restricting member arranged on the outer periphery of the inner shaft member 16 may be integrally formed with the holding member 52 that constitutes the stopper member 14. In that case, the elastic auxiliary portion may be fixedly formed to the regulating member integrally formed with the holding member 52. Further, the restriction wall portion 110 in the third embodiment may be configured as a separate member independent of the outer tubular member 102 to constitute the restriction member.

  Further, in the first embodiment, the stopper rubber 54 and the elastic auxiliary portion 60 are integrally formed, but they may be separately formed. However, since the stopper rubber and the elastic auxiliary portion are integrally formed, the number of parts can be reduced. Further, in the first embodiment, the stopper rubber 54 is partially provided in the circumferential direction in the stopper member 14, but the stopper rubber may be continuously provided over the entire circumference. Note that the stopper mechanism for buffering the relative displacement between the inner shaft member and the outer tubular member is not essential.

  Furthermore, in the above-described embodiment, the thick portions 62, 116 are provided at the upper ends of the elastic auxiliary portions 60, 94, 114, but the thick portions are not essential. For example, the elastic auxiliary portions are simply cylinders. It may have a shape.

  Further, the shapes and the numbers of the upper and lower cursed portions and the slit holes provided in the main rubber elastic body are not limited in any way, and can be appropriately set according to the required vibration damping characteristics.

  The tubular vibration-damping device according to the present invention is not limited to the suspension member mount for automobiles as described in the above embodiment, and is applied to, for example, engine mounts, body mounts, differential mounts, etc. for automobiles. Alternatively, it may be applied to a vibration isolation device other than an automobile.

10, 78, 100: Member mount (cylindrical vibration isolator), 16: Inner shaft member (rigid member), 18, 82, 102: Outer cylinder member, 20, 90: Main rubber elastic body, 24, 84: Step Shaped portion, 26, 86, 106: locking piece, 28, 88, 108: locking claw, 48: insertion hole (mounting hole), 54: stopper rubber, 60, 94, 114: elastic auxiliary portion, 62, 96 , 116: thick part, 104: inner hole (mounting hole)

Claims (8)

An inner shaft member,
An outer tubular member made of synthetic resin,
A main body rubber elastic body connecting the inner shaft member and the outer tubular member,
An engaging piece provided with an engaging claw that is formed to extend axially outward from the outer tubular member and is engaged with an opening edge of a mounting hole into which the outer tubular member is press-fitted,
A restricting member that is positioned so as to be spaced apart from the inner peripheral side of the locking piece,
A cylindrical vibration isolator, comprising: an elastic auxiliary portion disposed between the restriction member and the locking piece.   The tubular vibration damping device according to claim 1, wherein the restriction member is configured by the inner shaft member.   The tubular vibration damping device according to claim 1, wherein the regulating member is integrally formed with the outer tubular member.   It has a stopper rubber which constitutes a stopper mechanism for buffering the relative displacement of the inner shaft member and the outer tubular member in the axial direction, and extends from the stopper rubber inward in the axial direction to extend the elasticity. The tubular vibration-damping device according to any one of claims 1 to 3, wherein the portion is integrally formed.   The tubular vibration isolator according to any one of claims 1 to 4, wherein the locking piece is partially formed in a circumferential direction of the outer tubular member.   The tubular vibration-damping device according to any one of claims 1 to 5, wherein the elastic auxiliary portion is tapered toward the base end side of the locking piece.   The tubular vibration-proof according to any one of claims 1 to 6, wherein the elastic auxiliary portion is provided with a thick portion that abuts a tip of the locking piece and defines an insertion end inward in the axial direction. apparatus.   A stepped portion that extends from one axial end of the outer tubular member toward the inner peripheral side is provided, and the locking piece projects from the stepped portion outward in the axial direction. Item 8. The tubular vibration damping device according to any one of items 1 to 7.

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