JP2010084807A - Cylindrical vibration control assembly - Google Patents

Abstract

The present invention provides a cylindrical vibration-proof assembly capable of more advantageously achieving excellent assembly properties of a rubber stopper to a shaft member and preventing the rubber stopper from falling off the shaft member.
A cylindrical or ring-shaped rubber stopper 12 is extrapolated to one end portion of a shaft member 14 connected to a main rubber elastic body 18 in an inserted state with respect to an outer cylindrical member 16; With respect to the inner peripheral surface of the extrapolated portion of the rubber stopper 12 to one end portion of the shaft member 14, the other end portion side opposite to the one end portion of the shaft member 14 is directed to the one end portion side. The return convex portion 36 that protrudes in an inclined manner is integrally formed, and the return convex portion 36 is compressed and deformed between the inner peripheral surface of the rubber stopper 12 and the outer peripheral surface of one end portion of the shaft member 14. Positioned and configured in a state.
[Selection] Figure 1

Description

  The present invention relates to a tubular vibration-proof assembly, and in particular, an improvement of a tubular vibration-proof assembly in which a stopper rubber is assembled to a tubular vibration-proof device such as a differential mount, member mount, and body mount of an automobile. It is about.

  As is well known, as a kind of anti-vibration coupling body that is interposed between the first member and the second member constituting the vibration transmission system and connects the two members, a shaft member and In addition, there is a cylindrical vibration isolator in which an outer cylinder member disposed around the shaft member and spaced radially outward is connected by a main rubber elastic body interposed therebetween. In such a cylindrical vibration isolator, the shaft member is usually fixed to the first member, while the outer cylinder member is press-fitted into the mounting hole provided in the second member. Thus, the vibration load (vibration) input in the axial direction or the direction perpendicular to the axis between the shaft member and the outer cylinder member is absorbed by the elastic deformation of the main rubber elastic body. Such a cylindrical vibration isolator is suitably used as a differential mount, a member mount, a body mount, or the like in a vehicle such as an automobile.

  By the way, in many of the cylindrical vibration isolators having such a structure, when a large vibration load is input in the axial direction, the relative displacement amount in the axial direction of the shaft member and the outer cylinder member is regulated. Thus, stopper means for preventing excessive deformation of the main rubber elastic body is attached for the purpose of improving the durability of the main rubber elastic body. There are various types of stopper means, and one of them is a rubber stopper that is made of a rubber elastic body that is separate from the cylindrical vibration isolator and is assembled to one axial end of the cylindrical vibration isolator. It has been. And when such a rubber stopper is used, a cylindrical vibration isolator is comprised as a cylindrical vibration proof assembly with which this rubber stopper is assembled | attached.

  The rubber stopper to be assembled to this cylindrical vibration isolator usually has an overall shape of a ring shape such as a cylindrical shape or an annular shape or a disk shape, and is extrapolated to one end of a shaft member of the cylindrical vibration isolator. It is assembled to the cylindrical vibration isolator. Then, when the shaft member is excessively displaced relative to the outer cylinder member on one end side in the axial direction on the extrapolation side of the stopper rubber, the second member or outer cylinder member is By abutting on one member, the relative displacement of the shaft member and the outer cylinder member toward one end in the axial direction is elastically restricted. The relative displacement of the shaft member and the outer cylinder member toward the other end in the axial direction is usually provided on the outer peripheral surface of the end portion of the outer cylinder member located on the other end side in the axial direction of the cylindrical vibration isolator. The outer flange portion is regulated by coming into contact with the first member via a stopper rubber portion formed integrally therewith with the main rubber elastic body.

  In general, a cylindrical vibration-proof assembly having such a structure is transported to a vehicle assembly factory and mounted on a vehicle in a state where the cylindrical vibration-proof device and the rubber stopper are assembled. Since the rubber stopper is merely extrapolated with respect to the shaft member, the rubber stopper may fall off the cylindrical vibration isolator during the conveyance.

  Therefore, conventionally, a rubber film integrally formed with the main rubber elastic body is fixed to the outer peripheral surface of the one end portion of the shaft member with a certain thickness. An engaging recess is formed. When the rubber stopper is extrapolated to one end portion of the shaft member, the rubber stopper gets over the engagement convex portion of the rubber film provided on the one end portion of the shaft member or the side wall portion of the engagement concave portion, thereby By engaging the engagement convex portion and the side surface of the engagement concave portion that are positioned toward the other end side of the rubber stopper, the rubber stopper is removed from the shaft member without performing the troublesome work of bonding the rubber stopper to the shaft member. Is prevented from falling off (see, for example, Patent Document 1 below).

  However, in the conventional cylindrical vibration-proof assembly provided with such a drop-off prevention structure, the height of the engaging projections and the engagement are prevented in order to reliably prevent the rubber stopper from dropping off from the shaft member. It is necessary to increase the depth of the joint recess to some extent. However, in this case, it becomes difficult to extrapolate the rubber stopper with respect to the shaft member, and there is a problem that the assembling property of the rubber stopper to the shaft member is impaired. . Further, the rubber film provided with the engaging convex portion and the engaging concave portion is formed integrally with the main rubber elastic body when the main rubber elastic body is integrally formed on the shaft member by molding such as injection molding. . Therefore, when the mold release direction of the main rubber elastic body is the same as the axial direction of the shaft member, the side walls of the engaging convex part and the engaging concave part are unavoidably undercut, In addition, there is a concern that the releasability is deteriorated, and that the releasability is further deteriorated when the height of the side wall portion of the engagement convex portion or the engagement concave portion is high.

  Also, considering the moldability of the main rubber elastic body and the ease of assembly of the rubber stopper to the shaft member, the inner periphery of the rubber stopper is not provided on the outer peripheral surface of the shaft member without any rubber film having uneven portions. There has also been proposed a cylindrical vibration-proof assembly with a protrusion that bends and deforms in the direction opposite to the direction of extrapolation of the rubber stopper when only the surface is extrapolated from the shaft member of the rubber stopper ( For example, see Patent Document 2 below). In this cylindrical vibration-proof assembly, when the rubber stopper is moved relative to the shaft member in the direction opposite to the direction of extrapolation to the shaft member, the protruding portion protrudes. The frictional resistance (sliding resistance) between the rubber stopper and the shaft member is increased based on the restoring force.

  However, in such a conventional cylindrical vibration-proof assembly, under the extrapolation with respect to the shaft member of the rubber stopper, the protruding portion protrudes from the inside of the inner hole of the rubber stopper to the outside, and simply the outer periphery of the shaft member When the relative movement to the side opposite to the extrapolation direction with respect to the shaft member of the rubber stopper from the state where it is only in contact with the surface, with the increase in the amount of contraction deformation in the protruding direction, The rubber stopper bulges outward in the radial direction, and therefore, it is not possible to sufficiently obtain the restoring force generated with the contraction deformation in the protruding direction of the protruding portion. Therefore, it is inevitable that the frictional resistance between the rubber stopper and the shaft member, which is exhibited based on the restoring force from the contraction deformation state of such a protrusion, becomes insufficient. It has been difficult to sufficiently prevent the rubber stopper from being pulled out from the shaft member by such a protrusion.

JP 2000-205323 A Japanese Patent Laid-Open No. 9-196095

  Here, the present invention has been made in the background as described above, and the problem to be solved is a cylinder in which a rubber stopper is extrapolated to one end of a shaft member and assembled. To provide an improved structure so that the assembly of the rubber stopper to the shaft member and the prevention of the rubber stopper from falling off the shaft member can be more advantageously achieved in the mold vibration isolator assembly. is there.

  And in the present invention, in order to solve the above-mentioned problems or the problems grasped from the entire description and drawings of the present specification, it can be suitably implemented in various modes as listed below. However, each aspect described below can be adopted in any combination. It should be noted that aspects or technical features of the present invention are not limited to those described below, and can be recognized based on the description of the entire specification and the inventive concept disclosed in the drawings. Should be understood.

(1) A shaft member fixed to the first member, and a shaft member fixed to the second member to be vibration-proof connected to the first member, and spaced apart radially outward of the shaft member. A cylindrical or ring-shaped rubber stopper is attached to one end of the shaft member of a cylindrical vibration-damping device formed by connecting the outer cylinder member with a rubber elastic body. An assembly,
With respect to the inner peripheral surface of the extrapolated portion of the rubber stopper to one end portion of the shaft member, the shaft member is inclined from the other end side opposite to the one end portion of the shaft member toward the one end portion side. The return convex portion protruding in an integrated manner is positioned between the inner peripheral surface of the rubber stopper and the outer peripheral surface of the one end portion of the shaft member in a compressed deformation state. This is a cylindrical vibration-proof assembly.

(2) The return convex portion is integrally formed so as to continuously extend in the circumferential direction over the entire circumference of the inner peripheral surface of the extrapolated portion of the rubber stopper to the one end portion of the shaft member. The cylindrical vibration-proof assembly according to the above aspect (1).

(3) A rigid reinforcing member is embedded in a portion where the return convex portion of the rubber stopper is formed, and the return convex portion is sandwiched between the reinforcing member and one end of the shaft member. The cylindrical vibration-proof assembly according to the above aspect (1) or (2).

  In short, in the cylindrical vibration-proof assembly according to the present invention, the return convex portion provided on the inner peripheral surface of the extrapolated portion of the rubber stopper to the one end portion of the shaft member is the other end portion side of the shaft member. Toward the one end side, that is, obliquely project toward the side opposite to the extrapolation direction of the rubber stopper to the one end portion of the shaft member. Therefore, when extrapolating the rubber stopper to one end of the shaft member, the side where the return convex portion is located on the side opposite to the extrapolation direction of the rubber stopper approaches or contacts the inner peripheral surface of the rubber stopper It is deformed to fall down. Therefore, when the rubber stopper is extrapolated to the shaft member, the return convex portion does not become a major obstacle, and the rubber stopper can be smoothly and easily extrapolated to one end portion of the shaft member.

  Moreover, in the tubular vibration-damping assembly according to the present invention, the rubber stopper is inserted into the shaft member in an extrapolated state, and is opposite to the direction in which the rubber stopper is inserted into one end of the shaft member, that is, one end of the shaft member. The return convex portion that is inclined and protrudes toward the direction in which the rubber stopper is extracted from the portion side is positioned between the inner peripheral surface of the rubber stopper and the outer peripheral surface of one end portion of the shaft member in a compressive deformation state. ing. For this reason, when the rubber stopper is moved relative to the shaft member in the extraction direction from the one end portion side of the shaft member, the rubber stopper returns it to the convex portion of the shaft member. The acting force that causes the rubber stopper to warp in the direction opposite to the direction in which the rubber stopper is pulled out from the one end side, in other words, the rubber stopper from the one end side of the shaft member with the return convex portion as the center of rotation. The acting force is applied so as to rotate in the direction opposite to the direction of the extraction of the. Therefore, when the rubber stopper is moved relative to the shaft member in the direction of extraction from the one end side, an increase in the amount of movement of the rubber stopper causes an increase in the distance between the outer peripheral surface and the inner peripheral surface of the rubber stopper. The amount of compression of the return convex portion that has been compressed and deformed gradually increases.

  Thus, in the cylindrical vibration-proof assembly of the present invention, when the rubber stopper and the shaft member move relative to each other, the protrusion that is contracted and deformed in a state in which the rubber stopper is allowed to bulge outward in the radial direction is provided. Unlike the conventional product formed on the rubber stopper, when the rubber stopper moves relative to the shaft member in the direction of extraction from the one end side, the compression amount of the return convex portion increases. Thus, the restoring force from the compression deformation state of the return convex portion increases, and as a result, a larger frictional resistance is generated between the rubber stopper and the shaft member based on the restoring force.

  Therefore, in the cylindrical vibration-proof assembly according to the present invention as described above, the assemblability of the rubber stopper with respect to the shaft member can be enhanced extremely effectively, and the rubber stopper from one end side of the shaft member can be improved. This can be prevented more advantageously and reliably.

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

  First, in FIG. 1, as an embodiment of a cylindrical vibration-proof assembly having a structure according to the present invention, a cylindrical vibration-proof assembly for connecting a vehicle differential to a vehicle body in a vibration-proof manner is shown. In FIG. As is clear from this figure, the cylindrical vibration-proof assembly of the present embodiment has a differential mount 10 as a cylindrical vibration-proof device, and a rubber stopper 12 assembled to the differential mount 10. It is configured.

  As is apparent from FIGS. 1 and 2, the differential mount 10 constituting the cylindrical vibration-proof assembly of this embodiment includes an inner cylinder fitting 14 as a shaft member and an outer cylinder fitting 16 as an outer cylinder member. In the state where the former is inserted into the latter, they are arranged at a predetermined distance in the radial direction, and a main rubber elastic body 18 is interposed between them, so that the inner and outer cylinder fittings 14, 16 are connected to each other. It has a known structure that is elastically connected.

  As in the conventional case, the outer cylindrical fitting 16 is against the cylindrical fixing portion 20 (indicated by a two-dot chain line in FIG. 1) on the vehicle body side or differential side (vehicle body side in this embodiment) as the second member. And fixed in a press-fitted state. On the other hand, the inner cylinder fitting 14 is inserted into the inner hole 22 thereof, and is attached to the differential member or the vehicle body side (the differential side in this embodiment) as the first member (shown by a two-dot chain line in FIG. 1). ) Are fixed by fixing bolts (stud bolts) 26 (indicated by a two-dot chain line in FIG. 1). As a result, the differential mount 10 is mounted between the differential and the vehicle body so that the differential can be connected to the vehicle body in a vibration-proof manner. Thus, under such a mounted state, the main vibration load is input to the differential mount 10 between the inner and outer cylinder fittings 14 and 16 in the axial direction which is the vertical direction in FIGS. 1 and 2. ing. From the following, for the sake of convenience, the side where the fixing bolt 26 is inserted into the inner hole 22 of the inner cylindrical metal fitting 14 in a state where the differential is attached to the vehicle body by the differential mount 10 (the upper side in FIGS. 1 and 2). ) Is referred to as the upper side, and the side where the mounting member 24 is located (the lower side in FIGS. 1 and 2) is referred to as the lower side.

  Incidentally, the inner cylinder fitting 14 has a substantially thick cylindrical shape. Further, the outer cylinder fitting 16 has a thin cylindrical shape having a diameter larger than the inner cylinder fitting 14 and a sufficiently small axial length. An outer flange portion 28 that protrudes radially outward by a predetermined height and continuously extends in the circumferential direction over the entire circumference is integrally provided at the lower end portion of the outer cylinder fitting 16. The inner cylinder fitting 14 has its upper end portion and lower end side portion protruding upward and downward through the upper opening portion and the lower opening portion of the outer cylinder fitting 16, respectively. The metal fitting 16 is coaxially inserted and arranged.

  A main rubber elastic body 18 having a substantially thick cylindrical shape as a whole is interposed between the inner cylindrical metal fitting 14 and the outer cylindrical metal fitting 16, and the inner peripheral surface of the main rubber elastic body 18. The inner cylinder fitting 14 is vulcanized and the outer cylinder fitting 16 is bonded to the outer peripheral surface thereof. Thus, the differential mount 10 is configured as an integrally vulcanized molded product in which the inner cylinder fitting 14 and the outer cylinder fitting 16 are vulcanized and bonded to the inner and outer peripheral surfaces of the main rubber elastic body 18.

  Further, a stopper rubber portion 30 formed integrally with the main rubber elastic body 18 is vulcanized and bonded to the lower end surface of the outer flange portion 28 formed integrally with the lower end portion of the outer cylinder fitting 16. Further, the outer flange portion 28 of the outer cylinder fitting 16 contacts the upper end surface of the cylindrical fixing portion 20 to which the outer cylinder fitting 16 is fixed on the upper end surface of the stopper rubber portion 30 opposite to the vulcanization adhesion side. is doing.

  And the cylindrical rubber stopper 12 is extrapolated and assembled | attached to the upper end part of the inner cylinder metal fitting 14 protruded upwards from the upper side opening part of the outer cylinder metal fitting 16. As shown in FIG. As is clear from FIG. 2 that shows the state before the rubber stopper 12 is assembled to the upper end portion of the inner cylinder fitting 14, the rubber stopper 12 is As indicated by the extracted arrows, the inner cylinder fitting 14 is extrapolated from the upper end side and assembled.

  As shown in FIG. 1, the rubber stopper 12 has a lower end surface in contact with the upper end surface of the cylindrical fixing portion 20 and an upper end surface of the rubber stopper 12 on the inner cylinder fitting 14. It is in contact with the lower surface of a substantially thick disc-shaped stopper fitting 32 that is externally attached to a fixing bolt 26 that fixes the tubular fitting 14.

  Thus, the rubber stopper 12 that is externally attached to the upper end portion of the inner cylindrical fitting 14 is interposed between the cylindrical fixing portion 20 and the stopper fitting 32. The rubber stopper 12 is clamped between the tubular fixing portion 20 and the stopper fitting 32 and compressed and deformed by tightening the nut 34 screwed onto the fixing bolt 26 above the stopper fitting 32. ing. Further, based on the tightening force of the nut 34, the inner cylinder fitting 14 is fixed to the attachment member 24 in a state where it is clamped between the attachment member 24 and the stopper fitting 32. And the stopper rubber part 30 is interposed between the upper surface of the attachment member 24 and the lower end face of the outer flange part 28 of the outer cylinder fitting 16 under such a state that the inner cylinder fitting 14 is fixed to the attachment member 24. Is placed.

  Thus, when the vibration load in the axial direction is input between the inner and outer cylindrical metal fittings 14 and 16 under the vibration-damping connection state of the differential to the vehicle body by the tubular vibration-damping assembly of the present embodiment, the main rubber elasticity The body 18 is sheared and deformed, and at the same time, either the rubber stopper 12 or the stopper rubber layer 30 is elastically compressed and deformed according to the input direction of the vibration load. Thus, the axial vibration load input between the inner and outer cylinder fittings 14 and 16 is effectively caused by the cooperative action of the shear deformation of the main rubber elastic body 18 and the compression deformation of the rubber stopper 12 and the stopper rubber layer 30. It can be absorbed.

  In addition, when a large axial vibration load is input between the inner and outer cylindrical fittings 14 and 16, the inner cylindrical fitting 14 is excessively displaced downward in the axial direction with respect to the outer cylindrical fitting 16. When the amount of compressive deformation of the rubber stopper 12 reaches a limit value, the excessive displacement of the inner and outer cylinder fittings 14 and 16 is prevented, while the inner cylinder fitting 14 is pivoted with respect to the outer cylinder fitting 16. When the amount of compressive deformation of the stopper rubber portion 30 reaches a limit value, excessive displacement of the inner and outer tube fittings 14 and 16 is prevented when the relative deformation is excessively performed upward in the direction. As a result, the amount of elastic deformation of the main rubber elastic body 18 is limited when a large vibration load in the axial direction is input between the inner and outer cylindrical metal fittings 14 and 16, so that breakage and damage can be prevented. It has become.

  By the way, in the cylindrical vibration-proof assembly of the present embodiment, the rubber stopper 12 that is externally attached to the upper end portion of the inner tubular fitting 14 and assembled has a special structure that cannot be seen conventionally. .

  More specifically, as shown in FIGS. 1 and 2, the rubber stopper 12 has a thick cylindrical shape that is sufficiently lower than the differential mount 10 as a whole, and has an inner diameter of The inner cylinder 14 is larger than the outer diameter by a predetermined dimension. When the rubber stopper 12 is inserted into the upper end portion of the outer cylinder fitting 16, the inner peripheral surface of the lower end side portion is opposed to the outer peripheral surface on the outer periphery side of the upper end portion of the outer cylinder fitting 16. , Are separated from each other.

  As apparent from FIGS. 1 to 3, the return convex portion 36 that projects radially inwardly extends from the inner peripheral surface of the lower end portion of the rubber stopper 12 so as to incline upward. Are integrally formed. That is, the return convex portion 36 is inserted in the direction of extrapolation of the rubber stopper 12 from the inner peripheral surface of the outer insertion portion of the rubber stopper 12 to the inner tube fitting 14 to the upper end portion of the inner tube fitting 14 (in FIG. Inclined toward the direction opposite to the arrow or the direction indicated by arrow A in FIG. 3 and protrudes in a so-called return form. In other words, as shown in FIG. 1, the return convex portion 36 provided at the lower end portion of the inner peripheral surface of the rubber stopper 12 is in the state of extrapolation of the rubber stopper 14 to the upper end portion of the inner cylinder fitting 14. The inner cylindrical fitting 14 protrudes from the lower end side opposite to the upper end side where the rubber stopper 12 is extrapolated, inclined toward the upper end side where the rubber stopper 12 is extrapolated. Further, the return convex portion 36 passes through the upper opening portion and the lower opening portion of the inner hole 45 of the rubber stopper 12 both before and after the rubber stopper 12 is inserted into the inner cylindrical fitting 14. The whole is positioned inside the inner hole 45 without partially protruding outside the hole 45.

  And in this embodiment, such a return convex part 36 is continuously extended in the circumferential direction over the perimeter with respect to the lower end part of the internal peripheral surface of the rubber stopper 12. As shown in FIG. As a result, the overall shape of the return convex portion 36 is a tapered cylindrical shape that gradually decreases in diameter upward. And while the outer peripheral surface of such a tapered cylindrical return convex portion 36 is an upper tapered surface 38 positioned above the inner peripheral surface, the inner peripheral surface of the return convex portion 36 is The lower tapered surface 40 is located below the outer peripheral surface.

  In addition, a reinforcing ring 42 as a rigid reinforcing member is embedded in the lower end portion of the rubber stopper 12 which is a formation portion of the rubber stopper 12. The reinforcing ring 42 is made of a thick annular metal plate. In other words, here, the inner peripheral surface, the outer peripheral surface, and the lower end surface of the reinforcing ring 42 are covered with the rubber film 44 integrally formed with the rubber stopper 12, and the lower end surface of the rubber stopper 12 is covered. It is vulcanized and bonded. A tapered cylindrical return convex portion 36 having the above-described structure is integrally formed on the inner peripheral surface of the rubber film 44 covering the inner peripheral surface of the reinforcing ring 42.

  Then, the rubber stopper 12 having such a structure is inserted into the upper end portion of the inner cylindrical metal fitting 14 and assembled, as shown in FIGS. 1 and 4, the lower end of the rubber stopper 12. The return convex portion 36 integrally formed on the inner peripheral surface of the portion falls into the inner peripheral surface of the rubber film 44 that covers the reinforcing ring 42 toward the side where the upper tapered surface 38 approaches, and the rubber film 44 and the reinforcing ring It is positioned between the inner peripheral surface of the rubber stopper 12 and the outer peripheral surface of the upper end portion of the inner cylinder fitting 14 while being compressed and deformed between 42 and the upper end portion of the inner cylinder fitting 14. . At this time, the return convex portion 36 is in direct contact with the outer peripheral surface of the upper end portion of the inner cylindrical metal member 14 without any inclusions therebetween.

  Therefore, in the cylindrical vibration-proof assembly of the present embodiment, when the rubber stopper 12 moves relative to the inner cylindrical metal piece 14 in the direction in which it protrudes upward from the upper end portion thereof, FIG. As indicated by the two-dotted line, the return convex portion 36 is bent downward by the sliding resistance between the outer peripheral surface of the inner cylindrical metal fitting 14 and the lower tapered surface 40 of the return convex portion 36 in contact therewith. Thus, the upper taper surface 38 of the return convex portion 36 is separated from the inner peripheral surface of the rubber stopper 12, and the contact area between the lower taper surface 40 and the outer peripheral surface of the inner cylindrical metal member 14 is increased. An acting force is applied to the return convex portion 36 so as to compress and compress the return convex portion 36 between the inner peripheral surface of the rubber stopper 12 and the outer peripheral surface of the inner cylinder fitting 14. Accordingly, the rubber stopper 12 is compressed and deformed between the inner peripheral surface of the rubber stopper 12 and the outer peripheral surface of the inner cylinder fitting 14 in accordance with an increase in the relative movement amount of the rubber stopper 12 in the direction of coming out upward from the inner cylinder fitting 14. The amount of compressive deformation of the return convex portion 36 gradually increases.

  Thus, in such a cylindrical vibration-proof assembly, when the rubber stopper 12 moves relative to the inner tube fitting 14 in the direction of coming out upward from its upper end, the amount of compressive deformation of the return projection 36 is increased. , The restoring force from the compression deformation state of the return convex portion 36 increases, and as a result, the larger the restoring force, the larger the gap between the rubber stopper 12 and the inner cylinder fitting 14. Frictional resistance is generated.

  Therefore, in the cylindrical vibration-proof assembly of this embodiment as described above, the rubber stopper 12 can be more advantageously and reliably prevented from falling off from the upper end portion of the inner cylinder fitting 14. .

  In addition, in this cylindrical vibration-proof assembly, the return convex portion 36 is provided at the lower end portion of the rubber stopper 12 that is the embedded portion of the reinforcing ring 42. In other words, the return convex portion 36 is integrally formed on the inner peripheral surface of the rubber film 44 that covers the inner and outer peripheral surfaces of the reinforcing ring 42 fixed to the lower end surface of the rubber stopper 12. Therefore, when the relative movement with respect to the inner cylindrical metal piece 14 is performed in the direction in which it protrudes upward from the upper end portion thereof, the return convex portion 36 is arranged so that the outer circumferential surface of the inner cylindrical metal piece 14 and the inner circumference of the rigid reinforcing ring 42 It is more reliably and sufficiently compressed and deformed between the surfaces. Accordingly, when the rubber stopper 12 is moved relative to the inner cylindrical metal member 14 in the direction of coming out upward from the upper end portion thereof, the restoring force from the compression deformation state of the return convex portion 36 is more sufficiently obtained. As a result, the rubber stopper 12 can be more reliably prevented from falling off from the upper end of the inner cylindrical fitting 14 upward.

  Moreover, in this embodiment, the return convex part 36 has a taper cylinder shape, and is formed so that it may extend continuously over the perimeter with respect to the internal peripheral surface of the rubber stopper 12. FIG. For this reason, for example, when the return convex portion is provided so as to extend in the circumferential direction while being divided at a plurality of locations in the circumferential direction with respect to the inner peripheral surface of the rubber stopper 12, that is, at a predetermined distance in the circumferential direction. Therefore, the contact area of the return convex portion 36 with respect to the outer peripheral surface of the inner cylindrical metal member 14 can be made larger than when a plurality of the convex portions 36 are provided. As a result, the frictional resistance generated between the return convex portion 36 and the outer peripheral surface of the inner cylindrical metal fitting 14 can be made sufficiently larger based on the restoring force of the return convex portion 36 from the compression deformation state. This also prevents the rubber stopper 12 from falling off from the upper end of the inner cylinder fitting 14 even more reliably.

  And in the cylindrical vibration-proof assembly of this embodiment, the return convex portion 36 has a tapered cylindrical shape that gradually becomes smaller in diameter toward the upper side, and is on the upper end side with respect to the upper end portion of the inner cylindrical metal fitting 14. It protrudes diagonally toward the direction opposite to the extrapolation direction. For this reason, when the rubber stopper 12 is extrapolated to the upper end portion of the inner tube fitting 14, the tapered cylindrical return convex portion 36 has the upper tapered surface 38 positioned on the side opposite to the extrapolation direction of the rubber stopper 12 as a rubber stopper. 12 is deformed so as to fall down to the side approaching the inner peripheral surface. Therefore, when the rubber stopper 12 is extrapolated to the inner cylindrical fitting 12, the return convex portion 36 does not become a major obstacle, and the rubber stopper 12 can be smoothly and relative to the upper end portion of the inner cylindrical fitting 12. It can be easily extrapolated. As a result, the assembling property of the rubber stopper 12 with respect to the inner cylindrical metal fitting 14 and, as a result, the manufacturability of the cylindrical vibration-proof assembly can be improved extremely effectively.

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

  If the return convex part is provided in the inner peripheral surface of the extrapolation site | part of the rubber stopper with respect to the one end part of a shaft member, the specific position will not be limited at all. In other words, if it is the inner peripheral surface portion of the rubber stopper that is opposed to the outer peripheral surface of one end portion of the shaft member on which the rubber stopper is externally inserted, the end portion of the inner peripheral surface portion or the intermediate portion thereof, A return convex portion may be provided.

  Moreover, in the said embodiment, the return convex part 36 exhibits the taper cylinder-like whole shape which becomes a small diameter gradually toward upper direction, and is continuous in the circumferential direction over the perimeter with respect to the internal peripheral surface of a rubber stopper. For example, the inner surface of the rubber stopper is formed as a divided tapered cylindrical shape obtained by dividing or dividing the illustrated tapered cylindrical shape at a plurality of locations in the circumferential direction. On the other hand, it can also be formed so as to be located at a predetermined interval in the circumferential direction. Alternatively, the return convex portion is constituted by a rod-like body or a plate-like body that protrudes from the other end portion side opposite to the one end portion of the shaft member toward the one end portion side, and rubber It is also possible to form the stopper so as to be positioned at a predetermined interval in the circumferential direction with respect to the inner peripheral surface of the stopper.

  Furthermore, if the rubber stopper 12 is extrapolated and assembled to the inner cylinder fitting 14 as the shaft member, the assembly structure of the rubber stopper 12 with respect to the inner cylinder fitting 14 is shown in the above embodiment. However, it is not limited at all. Needless to say, the fixing structure of the cylindrical vibration-proof assembly to the fixing member on the vehicle body side or the differential side is not particularly limited to the illustrated one.

  In addition, in the present embodiment, a specific example of applying the present invention to a cylindrical vibration-proof assembly in which a rubber stopper is assembled to a differential mount for an automobile is shown. It is advantageously applied to any of the cylindrical anti-vibration assemblies in which a rubber stopper is assembled to a cylindrical anti-vibration device such as a mount or a body mount, or a non-automotive cylindrical anti-vibration device. Of course you get.

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

It is a longitudinal section explanatory view showing one embodiment of a cylindrical vibration-proof assembly having a structure according to the present invention. It is longitudinal cross-sectional explanatory drawing which shows the state before assembling | attaching a cylindrical vibration isolator and a rubber stopper of the cylindrical vibration proof assembly shown in FIG. FIG. 3 is an enlarged explanatory view of a part III in FIG. 2. FIG. 4 is an enlarged explanatory view of a part IV in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Differential mount 12 Rubber stopper 14 Inner cylinder metal fitting 16 Outer cylinder metal fitting 18 Main body rubber elastic body 20 Cylindrical fixing part 24 Mounting member 36 Return convex part 42 Reinforcement ring

Claims (3)

A shaft member fixed to the first member and a second member to be vibration-proof connected to the first member, and arranged radially spaced around the shaft member. A cylindrical anti-vibration assembly in which a cylindrical or ring-shaped rubber stopper is externally attached to one end of the shaft member of a cylindrical anti-vibration device formed by connecting an outer cylindrical member with a main rubber elastic body. An appendage,
With respect to the inner peripheral surface of the extrapolated portion of the rubber stopper to one end portion of the shaft member, the shaft member is inclined from the other end side opposite to the one end portion of the shaft member toward the one end portion side. The return convex portion protruding in an integrated manner is positioned between the inner peripheral surface of the rubber stopper and the outer peripheral surface of the one end portion of the shaft member in a compressed deformation state. This is a cylindrical vibration-proof assembly.   The return convex portion is integrally formed so as to continuously extend in the circumferential direction over the entire circumference of the inner circumferential surface of the extrapolated portion of the rubber stopper to the one end portion of the shaft member. Item 2. The cylindrical vibration-proof assembly according to Item 1. A rigid reinforcing member is embedded in a portion where the return convex portion of the rubber stopper is formed, and the return convex portion is sandwiched between the reinforcing member and one end of the shaft member. Item 3. The cylindrical vibration-proof assembly according to claim 1 or 2.

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